Prostate Cancer Research

Continue reading "Activation of PI3K-Akt signaling pathway promotes prostate cancer cell invasion." »

Posted by at 8:14 PM | Permalink

Molecular biology in prostate cancer.

Clin Transl Oncol. 2006 Mar;8(3):148-52

Authors: Cansino Alcaide JR, Mart nez-Pi eiro L

Genes involved in cancer generation are usually tumor suppressors and oncogenes. Progressive genetic alterations in these genes are involved in the mechanisms of tumorigenesis. In prostate cancer, additionally several chromosomal loci that should harbor mutated genes have been proposed. Some genes have been found altered in prostate cancer, such as PTEN, TP53, AR, RNASEL (HPC1), ELAC2 (HPC2), CDKN2A and MSR1 and those can be natural targets for new strategies of treatment. Besides, gene therapy has been suggested to be suitable for prostate cancer treatment. This approach includes ex vivo corrective therapy, suicide, and antisense therapy.

PMID: 16648113 [PubMed - indexed for MEDLINE]

Posted by at 4:52 PM | Permalink

158 new PubMed citations were retrieved for your search. Click on the search hyperlink below to display the complete search results:

Prostate Cancer Genetics

These PubMed results were generated on 2006/08/09

PubMed, a service of the National Library of Medicine, includes over 15 million citations for biomedical articles back to the 1950's. These citations are from MEDLINE and additional life science journals. PubMed includes links to many sites providing full text articles and other related resources.

Posted by at 12:44 PM | Permalink

Related Articles

Expression of BAG-1 protein correlates with aggressive behavior of prostate cancers.

Prostate. 2006 Jun 1;66(8):801-10

Authors: Krajewska M, Turner BC, Shabaik A, Krajewski S, Reed JC

BACKGROUND: Differences in tumor behavior, ranging from indolent to aggressive, create a need for novel prognostic biomarkers. BAG-1 is a co-chaperone that regulates the activity of Hsp70, Bcl-2, Raf-1, growth factor, and steroid receptors (e.g., the Androgen Receptor). METHODS: Using immunohistochemical method, we explored BAG-1 expression in prostate cancers and its association with clinicopathological parameters. RESULTS: BAG-1 immunostaining was elevated in prostate cancer compared to normal prostatic epithelium. Higher nuclear BAG-1 in hormone-refractory (n = 34) compared to localized untreated tumors (n = 58) (P < 0.0001) suggested that upregulation of the nuclear isoform may contribute to disease progression. In 64 early-stage patients (T2N0M0) treated with external-beam irradiation, cytosolic BAG-1 correlated with higher pretreatment levels of serum Prostate specific antigen (P = 0.04) and shorter time to disease progression (P = 0.00004). CONCLUSIONS: Increased cytosolic and nuclear BAG-1 expression may denote more aggressive variants of prostate cancer.

PMID: 16482527 [PubMed - indexed for MEDLINE]

Posted by at 8:57 PM | Permalink

Related Articles

Phase II study evaluating oral triamcinolone in patients with androgen-independent prostate cancer.

Urology. 2006 May;67(5):1001-6

Authors: Srinivas S, Krishnan AV, Colocci N, Feldman D

OBJECTIVES: To assess the effect of triamcinolone administration on the serum prostate-specific antigen (PSA) response and the time to progression in patients with androgen-independent prostate cancer (AIPC). METHODS: Patients with AIPC were prospectively treated with oral triamcinolone 4 mg twice daily, and their serum PSA and cortisol levels were measured monthly. Patients with greater than 25% increases in serum PSA from baseline were considered to have progressive disease and were removed from the study. Those patients who had a decrease in serum PSA levels or stable disease continued in the study until disease progression. Bone scans were obtained every 12 weeks and at progression. RESULTS: Twenty-four patients with AIPC were treated from November 2002 to June 2004. A partial response with a more than 50% decrease in serum PSA level was seen in 29%. Another 21% achieved stable disease. No statistically significant difference was found in the time to progression in the partial responders and patients with stable disease. The median time to progression in both groups was 7.5 months. Treatment was well tolerated without any grade 3 or 4 toxicity. CONCLUSIONS: Oral triamcinolone was well tolerated by patients with AIPC, with 50% of the patients exhibiting a good response to therapy in terms of serum PSA level and time to progression.

PMID: 16698360 [PubMed - indexed for MEDLINE]

Posted by at 3:45 PM | Permalink

Expression and implication of hypoxia inducible factor-1alpha in prostate neoplasm.

J Huazhong Univ Sci Technolog Med Sci. 2004;24(6):593-5

Authors: Hao P, Chen X, Geng H, Gu L, Chen J, Lu G

To study the expression of hypoxia inducible factor-1alpha (HIF-1alpha) protein in prostate cancer (Pca) and its biological significance, the expression of HIF-1alpha was assayed by means of immunohistochemical technique in 42 prostate cancer, 12 prostatic intraepithelial neoplasm (PIN) and 9 normal prostate tissue (NP) specimens. Western blot was used to examine the expression of HIF-1alpha in prostate cancer cell line (PC-3M) induced by different oxygen tension. HIF-1alpha expression was positive in 33 Pca and 9 PIN specimens, and the positive rate of HIF-1alpha was higher in distant metastasis patients than in patients without metastasis of prostate cancer (P<0.05), while there was no expression of HIF-1alpha in NP. The level of HIF-1alpha in PC-3M significantly increased with the decrease of oxygen tension (P<0.01). Overexpression of HIF-1alpha is the preliminary event of the formation of Pca, which may induce carcinoma into malignant phenotype. Thus it may serve as an early diagnosis marker and the novel target for Pca treatment.

PMID: 15791851 [PubMed - indexed for MEDLINE]

Posted by at 10:54 AM | Permalink

Related Articles

Overexpression of ecto-protein kinases in prostasomes of metastatic cell origin.

Prostate. 2006 May 15;66(7):675-86

Authors: Babiker AA, Ronquist G, Nilsson B, Ekdahl KN

BACKGROUND: Prostasomes are secretory granules produced, stored, and released by the glandular epithelial cells of the prostate. They express numerous enzymes whose physiological roles have so far not been fully evaluated. In this study, we investigated the expression and function of prostasomal protein kinases and ATPase. METHODS: The protein kinase activities of prostasomes isolated from seminal fluid and malignant prostate cell lines (PC-3, DU145, and LNCaP) were investigated using the model phosphorylation substrates histone and casein, as well as the plasma proteins C3 and fibrinogen, in combination with specific protein kinase inhibitors. The prostasomal ATPase activity was also evaluated. The expression of protein kinases and ATPase on prostasomes was verified by flow cytometry. RESULTS: Prostasomes (intact or solubilized with octylglucoside or saponin) from prostate cancer cells had higher expression of protein kinases A, C, and casein kinase II compared to prostasomes isolated from seminal plasma, resulting in higher phosphorylation of both exogenous and endogenous substrates. Using intact prostasomes, it was found that prostasomes of metastatic origin had lower ATPase activity, resulting in higher residual ATP available for the phosphorylation reaction. Finally, complement component C3 and fibrinogen (two proteins whose activities are modulated by phosphorylation) were identified as physiologically relevant phosphorylation substrates. CONCLUSIONS: These results indicate that prostasomes are capable of modifying proteins possibly involved in the innate response by extracellular phosphorylation mediated by ecto-kinases. This is a novel mechanism by which prostatic malignant cells may interact with their environment.

PMID: 16425202 [PubMed - indexed for MEDLINE]

Posted by at 4:18 PM | Permalink

Related Articles

Gene expression studies in prostate cancer tissue: which reference gene should be selected for normalization?

J Mol Med. 2005 Dec;83(12):1014-24

Authors: Ohl F, Jung M, Xu C, Stephan C, Rabien A, Burkhardt M, Nitsche A, Kristiansen G, Loening SA, Radoni A, Jung K

Using quantitative reverse transcription-polymerase chain reaction (RT-PCR), reference genes are utilized as endogenous controls for relative quantification of target genes in gene profiling studies. The suitability of housekeeping genes for that purpose in prostate cancer tissue has not been sufficiently investigated so far. The objective of this study was to select from a panel of 16 potential candidate reference genes the most stable genes for gene normalization. Expression of mRNA encoding ACTB, ALAS1, ALB, B2M, G6PD, GAPD, HMBS, HPRT1, K-ALPHA-1, POLR2A, PPIA, RPL13A, SDHA, TBP, UBC, and YWHAZ was examined in matched, microdissected malignant and nonmalignant tissue specimens obtained from 17 nontreated prostate carcinomas after radical prostatectomy by real-time RT-PCR. The genes studied displayed a wide expression range with cycle threshold values between 16 and 37. The expression was not different between samples from pT2 and pT3 tumors or between samples with Gleason scores <7 and >or=7 (P>0.05). ACTB, RPL13A, and HMBS showed significant differences (P<0.02 at least) in expressions between malignant and nonmalignant pairs. All other genes did not differ between the matched pairs, and the software programs geNorm and NormFinder were used to ascertain the most suitable reference genes from these candidates. HPRT1, ALAS1, and K-ALPHA-1 were calculated by both programs to be the most stable genes covering a broad range of expression. The expression of the target gene RECK normalized with HRPT1 alone and with the normalization factors generated by the combination of these three reference genes as well as with the unstable genes ACTB or RPL13A is given. That example shows the significance of using suitable reference genes to avoid erroneous normalizations in gene profiling studies for prostate cancer. The use of HPRT1 alone as a reference gene shown in our study was sufficient, but the normalization factors generated from two (HRPT1, ALAS1) or all three genes (HRPT1, ALAS1, K-ALPHA-1) should be considered for an improved reliability of normalization in gene profiling studies of prostate cancer.

PMID: 16211407 [PubMed - indexed for MEDLINE]

Posted by at 11:42 AM | Permalink

Related Articles

RUNX1 (AML-1) and RUNX2 (AML-3) cooperate with prostate-derived Ets factor to activate transcription from the PSA upstream regulatory region.

J Cell Biochem. 2006 Jan 1;97(1):1-17

Authors: Fowler M, Borazanci E, McGhee L, Pylant SW, Williams BJ, Glass J, Davis JN, Meyers S

The RUNX transcription factors (RUNX1, RUNX2, and RUNX3) play essential roles in hematopoiesis and skeletal development. Consistent with these roles in differentiation and cell cycle, the activity of both RUNX1 and RUNX3 is perturbed in cancer. To determine a role for the RUNX factors in prostate biology, we investigated the expression of RUNX factors in prostate epithelial cell lines and normal prostate tissue. RUNX1, RUNX2, and RUNX3 were expressed in both normal prostate tissue and an immortalized, non-transformed cell line. We found that prostate cancer-derived cell lines expressed RUNX1 and RUNX2, but not RUNX3. Next, we sought to identify prostate-specific genes whose expression could be regulated by RUNX proteins. Four consensus RUNX sites are located within the prostate-specific antigen (PSA) regulatory region. Chromatin immunoprecipitation (ChIP) analysis showed that RUNX1 is specifically bound to the PSA regulatory region in LNCaP cells. RUNX1 and RUNX2 activated the PSA regulatory region alone or cooperatively with prostate-derived ETS factor (PDEF) and RUNX1 physically associated with PDEF. Taken together, our results suggest that RUNX factors participate in prostate epithelial cell function and cooperate with an Ets transcription factor to regulate PSA gene expression.

PMID: 16237704 [PubMed - indexed for MEDLINE]

Posted by at 4:32 PM | Permalink

Related Articles

Polymorphisms of CYP1A1, GSTM1, GSTT1, and prostate cancer risk in Turkish population.

Cancer Invest. 2006 Feb;24(1):41-5

Authors: Silig Y, Pinarbasi H, G nes S, Ayan S, Bagci H, Cetinkaya O

Prostate cancer is the most common cancer among men in many countries. Although the etiology of prostate cancer largely is unknown, both genetic and environmental factors may be involved. Advanced age, androgen metabolism, and heredity-race have been reported to be possible risk factors. On the other hand, several studies indicate that genetic polymorphisms in biotransformation enzymes play a role in prostate cancer development. In this study, association of the prostate cancer risk with genotype frequencies of the Phase I (CYP1A1) and Phase II (GSTM1 and GSTT1) biotransformation enzymes was investigated in 321 Turkish individuals (152 prostate cancer patients and 169 age-matched male controls). The presence or absences of the GSTM1 and GSTT1 genes were determined by a PCR-based method. Genotypes of CYP1A1 were determined by MspI-RFLP. The prevalence of GSTM1 null genotype in the cases was 64 percent, compared to 31 percent in the control group, indicating a strong association (OR = 4.08, 95%CI = 2.50-6.69). No association was observed between either GSTT1 null genotype or CYP1A1 polymorphism and prostate cancer incidence. No statistically significant association was observed between smoking status of the patients and any of the polymorphisms studied. In conclusion, results of this study indicate that only the GSTM1 null genotype may play an important role as a risk factor for prostate cancer development in Turkish population.

PMID: 16466991 [PubMed - indexed for MEDLINE]

Posted by at 5:57 PM | Permalink

Related Articles

MCM7 amplification and overexpression are associated with prostate cancer progression.

Oncogene. 2006 Feb 16;25(7):1090-8

Authors: Ren B, Yu G, Tseng GC, Cieply K, Gavel T, Nelson J, Michalopoulos G, Yu YP, Luo JH

The genomic DNA profiles of prostate cancers with aggressive features were compared to the profiles of matched normal DNA to identify genes that are selectively amplified in the cancer cells. One of the identified genes, MCM7, which is a component of the DNA replication licensing complex, has been studied extensively both at the DNA and protein levels in human prostate tissues. Approximately half of the prostate cancer specimens studied showed MCM7 gene amplification, and 60% of the aggressive prostate cancer specimens had increased MCM7 protein expression. Amplification or overexpression of MCM7 was significantly associated with relapse, local invasion and a worse tumor grade. Constitutive expression of MCM7 in a human prostate cancer cell line, DU145, resulted in markedly increased DNA synthesis and cell proliferation compared to vector-only controls, and an increased cell invasion in vitro. Indeed, MCM7 overexpression produced primary tumors 12 times larger than vector-only controls and resulted in a rapid demise of mice bearing those tumors. These studies implicate MCM7, and the DNA replication licensing gene family, in prostate cancer progression, growth and invasion.

PMID: 16247466 [PubMed - indexed for MEDLINE]

Posted by at 11:18 PM | Permalink

Posted by at 11:44 PM | Permalink

Posted by at 10:09 AM | Permalink

Posted by at 12:38 PM | Permalink

Posted by at 7:45 PM | Permalink

Posted by at 8:30 PM | Permalink

Posted by at 1:39 PM | Permalink

Posted by at 1:43 PM | Permalink

Posted by at 9:10 PM | Permalink

Posted by at 2:49 PM | Permalink

Posted by at 8:10 PM | Permalink

Posted by at 1:33 PM | Permalink

Posted by at 4:10 PM | Permalink

Posted by at 10:30 PM | Permalink

Posted by at 5:27 PM | Permalink

Posted by at 5:12 PM | Permalink

Posted by at 11:41 AM | Permalink

Posted by at 12:25 PM | Permalink

Posted by at 5:29 PM | Permalink

Posted by at 11:33 AM | Permalink

Posted by at 9:09 PM | Permalink

Posted by at 7:54 PM | Permalink

Posted by at 7:44 PM | Permalink

Posted by at 11:36 AM | Permalink

Posted by at 7:22 PM | Permalink

Posted by at 9:56 PM | Permalink

Posted by at 1:11 PM | Permalink

Posted by at 9:06 PM | Permalink

Posted by at 9:01 PM | Permalink

Related Articles

Critical function for ADAM9 in mouse prostate cancer.

Cancer Res. 2005 Oct 15;65(20):9312-9

Authors: Peduto L, Reuter VE, Shaffer DR, Scher HI, Blobel CP

ADAM9 is a membrane-anchored metalloprotease that is markedly up-regulated in several human carcinomas. Here, we show that ADAM9 is similarly up-regulated in mouse models for prostate, breast, and intestinal carcinoma. To assess whether ADAM9 is critical for the pathogenesis of prostate carcinoma, one of the most common cancers in men, we evaluated how loss of ADAM9 affects tumorigenesis in W(10) mice, a mouse model for this disease. In the absence of ADAM9, most tumors in 50-week-old W(10) mice were well differentiated, whereas littermate controls expressing wild-type ADAM9 had predominantly poorly differentiated, and in some cases significantly larger, tumors. Moreover, gain-of-function experiments in which ADAM9 was overexpressed in mouse prostate epithelium resulted in significant abnormalities, including epithelial hyperplasia at 4 to 6 months of age, and prostatic intraepithelial neoplasia after 1 year. A potential underlying mechanism for the role of ADAM9 in prostate cancer emerged from cell-based assays: ADAM9 can cleave and release epidermal growth factor and FGFR2iiib from cells, both of which have pivotal functions in the pathogenesis of this disease. Taken together, these results suggest that ADAM9 contributes to the pathogenesis of prostate cancer and potentially also other carcinomas, raising the possibility that ADAM9 might be a good target for antitumor drugs.

PMID: 16230393 [PubMed - indexed for MEDLINE]

Posted by at 9:32 PM | Permalink

Related Articles

A candidate gene approach to searching for low-penetrance breast and prostate cancer genes.

Nat Rev Cancer. 2005 Dec;5(12):977-85

Authors: Hunter DJ, Riboli E, Haiman CA, Albanes D, Altshuler D, Chanock SJ, Haynes RB, Henderson BE, Kaaks R, Stram DO, Thomas G, Thun MJ, Blanch H, Buring JE, Burtt NP, Calle EE, Cann H, Canzian F, Chen YC, Colditz GA, Cox DG, Dunning AM, Feigelson HS, Freedman ML, Gaziano JM, Giovannucci E, Hankinson SE, Hirschhorn JN, Hoover RN, Key T, Kolonel LN, Kraft P, Le Marchand L, Liu S, Ma J, Melnick S, Pharaoh P, Pike MC, Rodriguez C, Setiawan VW, Stampfer MJ, Trapido E, Travis R, Virtamo J, Wacholder S, Willett WC,

Most cases of breast and prostate cancer are not associated with mutations in known high-penetrance genes, indicating the involvement of multiple low-penetrance risk alleles. Studies that have attempted to identify these genes have met with limited success. The National Cancer Institute Breast and Prostate Cancer Cohort Consortium--a pooled analysis of multiple large cohort studies with a total of more than 5,000 cases of breast cancer and 8,000 cases of prostate cancer--was therefore initiated. The goal of this consortium is to characterize variations in approximately 50 genes that mediate two pathways that are associated with these cancers--the steroid-hormone metabolism pathway and the insulin-like growth factor signalling pathway--and to associate these variations with cancer risk.

PMID: 16341085 [PubMed - indexed for MEDLINE]

Posted by at 5:28 PM | Permalink

Related Articles

The cross talk between protein kinase A- and RhoA-mediated signaling in cancer cells.

Exp Biol Med (Maywood). 2005 Nov;230(10):731-41

Authors: Chen Y, Wang Y, Yu H, Wang F, Xu W

The cross talk between cyclic adenosine monophosphate (cAMP)/protein kinase A (PKA) and RhoA-mediated signal transductions and the effect of this cross talk on biologic features of human prostate and gastric cancer cells were investigated. In the human gastric cancer cell line, SGC-7901, lysophosphatidic acid (LPA) increased RhoA activity in a dose-dependent manner. The cellular permeable cAMP analog, 8-chlorophenylthio-cAMP (CPT-cAMP), inhibited the LPA-induced RhoA activation and caused phosphorylation of RhoA at serine(188). Immunofluorescence microscopy, Western blotting, and green fluorescent protein (GFP)-tagged RhoA location assay in live cells revealed that RhoA was distributed in both the cytoplasm and nucleus of SGC-7901 cells. Treatment with LPA and/or CPT-cAMP did not induce obvious translocation of RhoA in the cells. The LPA treatment caused formation of F-actin in SGC-7901 cells, and CPT-cAMP inhibited the formation. In a modified Boyden chamber assay, LPA stimulated the migration of SGC-7901 cells, and CPT-cAMP dose-dependently inhibited the stimulating effect of LPA. In soft agar assay, LPA stimulated early proliferation of SGC-7901 cells, and CPT-cAMP significantly inhibited the growth of LPA-stimulated cells. In the prostate cancer cell line, PC-3, LPA caused morphologic changes from polygonal to round, and transfection with plasmid DNA encoding constitutively active RhoA(63L) caused a similar change. Treatment with CPT-cAMP inhibited the changes in both cases. However, in PC-3 cells transfected with a plasmid encoding mutant RhoA188A, LPA induced rounding, but CPT-cAMP could not prevent the change. Results of this experiment indicated that cAMP/PKA inhibited RhoA activation, and serine188 phosphorylation on RhoA was necessary for PKA to exert its inhibitory effect on RhoA activation. The cross talk between cAMP/PKA and RhoA-mediated signal transductions had significant affect on biologic features of gastric and prostate cancer cells, such as morphologic and cytoskeletal change, migration, and anchorage-independent growth. The results may be helpful in implementing novel therapeutic strategies for invasive and metastatic prostate and gastric cancers.

PMID: 16246900 [PubMed - indexed for MEDLINE]

Posted by at 6:18 PM | Permalink

Related Articles

Radiosensitivity detected by the micronucleus test is not generally increased in sporadic prostate cancer patients.

Cytogenet Genome Res. 2005;111(1):41-5

Authors: Varga D, Michel I, Patino-Garcia B, Paiss T, Vogel W, Maier C

The micronucleus test (MNT) has shown increased micronuclei (MN) frequencies in BRCA associated and sporadic breast cancer patients, Ataxia telangiectasia and Nijmegen Breakage Syndrome patients, demonstrating a common cellular phenotype of increased radiosensitivity. Some genes, causative of these diseases, have also recently been associated with prostate cancer. In order to investigate if prostate cancer exhibits the cellular phenotype of increased radiosensitivity, we performed MNT analysis on 22 sporadic prostate cancer patients and 43 male controls. We determined the baseline MN frequency, in order to see in vivo chromosomal damage without radiation, and induced (after irradiation with 2 Gy) frequency of MN, both in binucleated cells (BNC) obtained from cultured peripheral blood lymphocytes. An automated image analysis system was used to score the MN employing two different classifiers (Classifier A and B) for detection of BNC. The mean baseline frequencies were 48/43 MN/1000 BNC (A/B) for the controls and 42/50 (A/B) for prostate cancer patients. The induced MN frequencies amounted to 107/111 MN/1000 BNC (A/B) for controls and 111/114 MN/1000 BNC (A/B) for prostate cancer patients. The obtained MN frequencies did not result in a statistically significant difference between unselected cases and controls. However, restricting the analysis to young patients (50-60 years, N = 7) and age-matched controls (N = 7) revealed marginally significant higher MN frequencies in patients. We conclude that increased radiosensitivity is not a property of prostate cancer patients in general.

PMID: 16093719 [PubMed - indexed for MEDLINE]

Posted by at 4:16 PM | Permalink

Related Articles

Steroid hormones stimulate human prostate cancer progression and metastasis.

Int J Cancer. 2005 Dec 5;

Authors: Ricke WA, Ishii K, Ricke EA, Simko J, Wang Y, Hayward SW, Cunha GR

Tissue recombinants (TRs) composed of mouse urogenital mesenchyme (mUGM) plus an immortalized nontumorigenic human prostatic epithelial cell line (BPH-1) were grown under the kidney capsule of male athymic nude mice under different hormonal conditions. The objectives were to determine temporal plasma concentrations of testosterone (T) and estradiol-17beta (E(2)) that elicit progression of nontumorigenic human prostatic epithelial cells in vivo. Second, to determine whether mUGM+BPH-1 TRs in [T+E(2)]-treated hosts could progress to metastases. Control mouse hosts received no exogenous hormonal support, whereas treated mice received Silastic implants containing T and E(2) for 1-4 months. Plasma from hormonally treated mice contained significantly higher (p < 0.01) concentrations of T at 1 month (11.7 vs. 0.9 ng/ml). Plasma levels of E(2) in steroid implanted mice were significantly higher (p <0.05) at 2 months (104.5 vs. 25.6 ng/l) and 4 months (122.8 vs. 19.2 pg/ml). Wet weights of mUGM+BPH-1 TRs from [T+E(2)]-implanted mice were significantly larger (p < 0.001) than those from untreated hosts. Untreated mUGM+BPH-1 TRs contained a well organized differentiated epithelium surrounded by smooth muscle stroma similar to developing prostate. In [T+E(2)]-implanted mice, mUGM+BPH-1 TRs formed carcinomas that contained a fibrous connective tissue stroma permeating the tumor; smooth muscle when present was associated with vasculature. Renal lymph nodes collected from [T+E(2)]-treated mice, but not untreated mice, contained metastatic carcinoma cells. Moreover, metastases could be observed at distant sites including lung and liver. Epithelial cells isolated from untreated mUGM+BPH-1 TRs exhibited benign histology and formed small nontumorigenic grafts when subsequently transplanted into athymic nude mice. In contrast, epithelial cells isolated from mUGM+BPH-1 tumors of [T+E(2)]-treated hosts formed large tumors that grew independent of stromal and hormonal support and developed lymph node metastases. We conclude that [T+E(2)]-treatment promotes prostatic cancer progression in mUGM + BPH-1 TRs. Use of mUGM in this system will allow future studies to utilize the power of mouse genetics to identify paracrine factors involved in human prostatic carcinogenesis. (c) 2005 Wiley-Liss, Inc.

PMID: 16331600 [PubMed - as supplied by publisher]

Posted by at 9:17 PM | Permalink

Related Articles

Steroid hormones stimulate human prostate cancer progression and metastasis.

Int J Cancer. 2005 Dec 5;

Authors: Ricke WA, Ishii K, Ricke EA, Simko J, Wang Y, Hayward SW, Cunha GR

Tissue recombinants (TRs) composed of mouse urogenital mesenchyme (mUGM) plus an immortalized nontumorigenic human prostatic epithelial cell line (BPH-1) were grown under the kidney capsule of male athymic nude mice under different hormonal conditions. The objectives were to determine temporal plasma concentrations of testosterone (T) and estradiol-17beta (E(2)) that elicit progression of nontumorigenic human prostatic epithelial cells in vivo. Second, to determine whether mUGM+BPH-1 TRs in [T+E(2)]-treated hosts could progress to metastases. Control mouse hosts received no exogenous hormonal support, whereas treated mice received Silastic implants containing T and E(2) for 1-4 months. Plasma from hormonally treated mice contained significantly higher (p < 0.01) concentrations of T at 1 month (11.7 vs. 0.9 ng/ml). Plasma levels of E(2) in steroid implanted mice were significantly higher (p <0.05) at 2 months (104.5 vs. 25.6 ng/l) and 4 months (122.8 vs. 19.2 pg/ml). Wet weights of mUGM+BPH-1 TRs from [T+E(2)]-implanted mice were significantly larger (p < 0.001) than those from untreated hosts. Untreated mUGM+BPH-1 TRs contained a well organized differentiated epithelium surrounded by smooth muscle stroma similar to developing prostate. In [T+E(2)]-implanted mice, mUGM+BPH-1 TRs formed carcinomas that contained a fibrous connective tissue stroma permeating the tumor; smooth muscle when present was associated with vasculature. Renal lymph nodes collected from [T+E(2)]-treated mice, but not untreated mice, contained metastatic carcinoma cells. Moreover, metastases could be observed at distant sites including lung and liver. Epithelial cells isolated from untreated mUGM+BPH-1 TRs exhibited benign histology and formed small nontumorigenic grafts when subsequently transplanted into athymic nude mice. In contrast, epithelial cells isolated from mUGM+BPH-1 tumors of [T+E(2)]-treated hosts formed large tumors that grew independent of stromal and hormonal support and developed lymph node metastases. We conclude that [T+E(2)]-treatment promotes prostatic cancer progression in mUGM + BPH-1 TRs. Use of mUGM in this system will allow future studies to utilize the power of mouse genetics to identify paracrine factors involved in human prostatic carcinogenesis. (c) 2005 Wiley-Liss, Inc.

PMID: 16331600 [PubMed - as supplied by publisher]

Posted by at 9:20 PM | Permalink

Related Articles

Steroid hormones stimulate human prostate cancer progression and metastasis.

Int J Cancer. 2005 Dec 5;

Authors: Ricke WA, Ishii K, Ricke EA, Simko J, Wang Y, Hayward SW, Cunha GR

Tissue recombinants (TRs) composed of mouse urogenital mesenchyme (mUGM) plus an immortalized nontumorigenic human prostatic epithelial cell line (BPH-1) were grown under the kidney capsule of male athymic nude mice under different hormonal conditions. The objectives were to determine temporal plasma concentrations of testosterone (T) and estradiol-17beta (E(2)) that elicit progression of nontumorigenic human prostatic epithelial cells in vivo. Second, to determine whether mUGM+BPH-1 TRs in [T+E(2)]-treated hosts could progress to metastases. Control mouse hosts received no exogenous hormonal support, whereas treated mice received Silastic implants containing T and E(2) for 1-4 months. Plasma from hormonally treated mice contained significantly higher (p < 0.01) concentrations of T at 1 month (11.7 vs. 0.9 ng/ml). Plasma levels of E(2) in steroid implanted mice were significantly higher (p <0.05) at 2 months (104.5 vs. 25.6 ng/l) and 4 months (122.8 vs. 19.2 pg/ml). Wet weights of mUGM+BPH-1 TRs from [T+E(2)]-implanted mice were significantly larger (p < 0.001) than those from untreated hosts. Untreated mUGM+BPH-1 TRs contained a well organized differentiated epithelium surrounded by smooth muscle stroma similar to developing prostate. In [T+E(2)]-implanted mice, mUGM+BPH-1 TRs formed carcinomas that contained a fibrous connective tissue stroma permeating the tumor; smooth muscle when present was associated with vasculature. Renal lymph nodes collected from [T+E(2)]-treated mice, but not untreated mice, contained metastatic carcinoma cells. Moreover, metastases could be observed at distant sites including lung and liver. Epithelial cells isolated from untreated mUGM+BPH-1 TRs exhibited benign histology and formed small nontumorigenic grafts when subsequently transplanted into athymic nude mice. In contrast, epithelial cells isolated from mUGM+BPH-1 tumors of [T+E(2)]-treated hosts formed large tumors that grew independent of stromal and hormonal support and developed lymph node metastases. We conclude that [T+E(2)]-treatment promotes prostatic cancer progression in mUGM + BPH-1 TRs. Use of mUGM in this system will allow future studies to utilize the power of mouse genetics to identify paracrine factors involved in human prostatic carcinogenesis. (c) 2005 Wiley-Liss, Inc.

PMID: 16331600 [PubMed - as supplied by publisher]

Posted by at 12:16 PM | Permalink

Related Articles

Steroid hormones stimulate human prostate cancer progression and metastasis.

Int J Cancer. 2005 Dec 5;

Authors: Ricke WA, Ishii K, Ricke EA, Simko J, Wang Y, Hayward SW, Cunha GR

Tissue recombinants (TRs) composed of mouse urogenital mesenchyme (mUGM) plus an immortalized nontumorigenic human prostatic epithelial cell line (BPH-1) were grown under the kidney capsule of male athymic nude mice under different hormonal conditions. The objectives were to determine temporal plasma concentrations of testosterone (T) and estradiol-17beta (E(2)) that elicit progression of nontumorigenic human prostatic epithelial cells in vivo. Second, to determine whether mUGM+BPH-1 TRs in [T+E(2)]-treated hosts could progress to metastases. Control mouse hosts received no exogenous hormonal support, whereas treated mice received Silastic implants containing T and E(2) for 1-4 months. Plasma from hormonally treated mice contained significantly higher (p < 0.01) concentrations of T at 1 month (11.7 vs. 0.9 ng/ml). Plasma levels of E(2) in steroid implanted mice were significantly higher (p <0.05) at 2 months (104.5 vs. 25.6 ng/l) and 4 months (122.8 vs. 19.2 pg/ml). Wet weights of mUGM+BPH-1 TRs from [T+E(2)]-implanted mice were significantly larger (p < 0.001) than those from untreated hosts. Untreated mUGM+BPH-1 TRs contained a well organized differentiated epithelium surrounded by smooth muscle stroma similar to developing prostate. In [T+E(2)]-implanted mice, mUGM+BPH-1 TRs formed carcinomas that contained a fibrous connective tissue stroma permeating the tumor; smooth muscle when present was associated with vasculature. Renal lymph nodes collected from [T+E(2)]-treated mice, but not untreated mice, contained metastatic carcinoma cells. Moreover, metastases could be observed at distant sites including lung and liver. Epithelial cells isolated from untreated mUGM+BPH-1 TRs exhibited benign histology and formed small nontumorigenic grafts when subsequently transplanted into athymic nude mice. In contrast, epithelial cells isolated from mUGM+BPH-1 tumors of [T+E(2)]-treated hosts formed large tumors that grew independent of stromal and hormonal support and developed lymph node metastases. We conclude that [T+E(2)]-treatment promotes prostatic cancer progression in mUGM + BPH-1 TRs. Use of mUGM in this system will allow future studies to utilize the power of mouse genetics to identify paracrine factors involved in human prostatic carcinogenesis. (c) 2005 Wiley-Liss, Inc.

PMID: 16331600 [PubMed - as supplied by publisher]

Posted by at 3:23 PM | Permalink

Related Articles

Steroid hormones stimulate human prostate cancer progression and metastasis.

Int J Cancer. 2005 Dec 5;

Authors: Ricke WA, Ishii K, Ricke EA, Simko J, Wang Y, Hayward SW, Cunha GR

Tissue recombinants (TRs) composed of mouse urogenital mesenchyme (mUGM) plus an immortalized nontumorigenic human prostatic epithelial cell line (BPH-1) were grown under the kidney capsule of male athymic nude mice under different hormonal conditions. The objectives were to determine temporal plasma concentrations of testosterone (T) and estradiol-17beta (E(2)) that elicit progression of nontumorigenic human prostatic epithelial cells in vivo. Second, to determine whether mUGM+BPH-1 TRs in [T+E(2)]-treated hosts could progress to metastases. Control mouse hosts received no exogenous hormonal support, whereas treated mice received Silastic implants containing T and E(2) for 1-4 months. Plasma from hormonally treated mice contained significantly higher (p < 0.01) concentrations of T at 1 month (11.7 vs. 0.9 ng/ml). Plasma levels of E(2) in steroid implanted mice were significantly higher (p <0.05) at 2 months (104.5 vs. 25.6 ng/l) and 4 months (122.8 vs. 19.2 pg/ml). Wet weights of mUGM+BPH-1 TRs from [T+E(2)]-implanted mice were significantly larger (p < 0.001) than those from untreated hosts. Untreated mUGM+BPH-1 TRs contained a well organized differentiated epithelium surrounded by smooth muscle stroma similar to developing prostate. In [T+E(2)]-implanted mice, mUGM+BPH-1 TRs formed carcinomas that contained a fibrous connective tissue stroma permeating the tumor; smooth muscle when present was associated with vasculature. Renal lymph nodes collected from [T+E(2)]-treated mice, but not untreated mice, contained metastatic carcinoma cells. Moreover, metastases could be observed at distant sites including lung and liver. Epithelial cells isolated from untreated mUGM+BPH-1 TRs exhibited benign histology and formed small nontumorigenic grafts when subsequently transplanted into athymic nude mice. In contrast, epithelial cells isolated from mUGM+BPH-1 tumors of [T+E(2)]-treated hosts formed large tumors that grew independent of stromal and hormonal support and developed lymph node metastases. We conclude that [T+E(2)]-treatment promotes prostatic cancer progression in mUGM + BPH-1 TRs. Use of mUGM in this system will allow future studies to utilize the power of mouse genetics to identify paracrine factors involved in human prostatic carcinogenesis. (c) 2005 Wiley-Liss, Inc.

PMID: 16331600 [PubMed - as supplied by publisher]

Posted by at 8:26 PM | Permalink

Related Articles

Use of tissue recombination to predict phenotypes of transgenic mouse models of prostate carcinoma.

Lab Invest. 2005 Sep;85(9):1086-103

Authors: Ishii K, Shappell SB, Matusik RJ, Hayward SW

Transgenic mouse models of cancer represent a powerful approach for exploring disease processes and testing potential therapeutic interventions. Currently, it is difficult to predict if a specific genetic manipulation will result in a desirable phenotype. The present study tests the idea that tissue recombinants recapitulate the pathologic features of the neoplastic prostate seen in transgenic mice, and would thus be suitable predictive models for new mouse design. The large probasin-large T-antigen (LPB-Tag) transgenic lines 12T-7f and 12T-10 were used as a basis for this study. Tissue recombinants of bladder epithelium (BlE) and urogenital sinus mesenchyme (UGM) were implanted under the renal capsule of athymic mice. Recombinants composed of BlE from 12T-10 LPB-Tag and wild-type (wt) UGM faithfully recapitulated the histopathologic and temporal features of intact transgenic mice of this line. Tissue recombinants using BlE from 12T-7f mice and wt UGM developed epithelial proliferation with atypia that lacked the associated hypercellular stroma seen in the intact 12T-7f line. Recombinants using 12T-7f UGM demonstrated that the hypercellular stroma results from stromal cell expression of the SV40 large T antigen. Corresponding to the recombinant phenotypes, stromal Tag immunostaining was observed in prostate tissues from intact 12T-7f but not 12T-10 mice. Similar stromal expression of Tag was also noted in the hypercellular TRAMP prostatic stroma. Further analysis revealed a previously unreported pattern of SV40T expression in the LADY and TRAMP models including ductus deferens and seminal vesicle stroma as well as region and cell type-specific patterns in the epididymis. The present study demonstrates the utility of using tissue recombination to explore organ-specific phenotypes. Recombination strategies should enable quick and cost-effective screening for likely phenotypes in transgenic animals. This comparison of tissue recombination to existing models shows that this approach can elicit new information on well-characterized models.

PMID: 15980886 [PubMed - indexed for MEDLINE]

Posted by at 10:25 PM | Permalink

Related Articles

Effects of 2,4-D and DCP on the DHT-induced androgenic action in human prostate cancer cells.

Toxicol Sci. 2005 Nov;88(1):52-9

Authors: Kim HJ, Park YI, Dong MS

2,4-Dichlorophenoxyacetic acid (2,4-D) and its metabolite 2,4-dichlorophenol (DCP) are used extensively in agriculture as herbicides, and are suspected of potential endocrine disruptor activity. In a previous study, we showed that these compounds exhibited synergistic androgenic effects by co-treatment with testosterone in the Hershberger assay. To elucidate the mechanisms of the synergistic effects of these compounds on the androgenicity of testosterone, the androgenic action of 2,4-D and DCP was characterized using a mammalian detection system in prostate cancer cell lines. In in vitro assay systems, while 2,4-D or DCP alone did not show androgenic activity, 2,4-D or DCP with 5alpha-dihydroxytestosterone (DHT) exhibited synergistic androgenic activities. Co-treatment of 10 nM 2,4-D or DCP with 10 nM DHT was shown to stimulate the cell proliferation by 1.6-fold, compared to 10 nM DHT alone. In addition, in transient transfection assays, androgen-induced transactivation was also increased to a maximum of 32-fold or 1.28-fold by co-treatment of 2,4-D or DCP with DHT, respectively. However, 2,4-D and DCP exerted no effects on either mRNA or protein levels of AR. In a competitive AR binding assay, 2,4-D and DCP inhibited androgen binding to AR, up to 50% at concentrations of approximately 0.5 microM for both compounds. The nuclear translocation of green fluorescent protein-AR fusion protein in the presence of DHT was promoted as the result of the addition of 2,4-D and DCP. Collectively, these results that 2,4-D and DCP enhanced DHT-induced AR transcriptional activity might be attributable, at least in part, to the promotion of AR nuclear translocation.

PMID: 16107550 [PubMed - indexed for MEDLINE]

Posted by at 4:56 PM | Permalink

Related Articles

Effects of 2,4-D and DCP on the DHT-induced androgenic action in human prostate cancer cells.

Toxicol Sci. 2005 Nov;88(1):52-9

Authors: Kim HJ, Park YI, Dong MS

2,4-Dichlorophenoxyacetic acid (2,4-D) and its metabolite 2,4-dichlorophenol (DCP) are used extensively in agriculture as herbicides, and are suspected of potential endocrine disruptor activity. In a previous study, we showed that these compounds exhibited synergistic androgenic effects by co-treatment with testosterone in the Hershberger assay. To elucidate the mechanisms of the synergistic effects of these compounds on the androgenicity of testosterone, the androgenic action of 2,4-D and DCP was characterized using a mammalian detection system in prostate cancer cell lines. In in vitro assay systems, while 2,4-D or DCP alone did not show androgenic activity, 2,4-D or DCP with 5alpha-dihydroxytestosterone (DHT) exhibited synergistic androgenic activities. Co-treatment of 10 nM 2,4-D or DCP with 10 nM DHT was shown to stimulate the cell proliferation by 1.6-fold, compared to 10 nM DHT alone. In addition, in transient transfection assays, androgen-induced transactivation was also increased to a maximum of 32-fold or 1.28-fold by co-treatment of 2,4-D or DCP with DHT, respectively. However, 2,4-D and DCP exerted no effects on either mRNA or protein levels of AR. In a competitive AR binding assay, 2,4-D and DCP inhibited androgen binding to AR, up to 50% at concentrations of approximately 0.5 microM for both compounds. The nuclear translocation of green fluorescent protein-AR fusion protein in the presence of DHT was promoted as the result of the addition of 2,4-D and DCP. Collectively, these results that 2,4-D and DCP enhanced DHT-induced AR transcriptional activity might be attributable, at least in part, to the promotion of AR nuclear translocation.

PMID: 16107550 [PubMed - indexed for MEDLINE]

Posted by at 10:10 PM | Permalink

Related Articles

Health motivation and emotional vigilance in genetic testing for prostate cancer risk.

Clin Genet. 2004 Dec;66(6):512-6

Authors: Li Y, Doukas DJ

Actual uptake of genetic testing for cancer susceptibility is generally lower than 50%, despite a high initial interest above 80%. As population-based genetic testing for cancer susceptibility becomes more widespread, there will be an increasing need to understand the relationship of patient-affective factors to test intention and actual uptake behavior. Using hypothetical genetic testing for prostate cancer susceptibility as an example, we used surveys of 400 men in the general population of Philadelphia to develop a Structural Equation Modeling diagram to reveal the influence of affective factors implicated in the intention to undergo genetic testing for prostate cancer risk. Results showed that most men want genetic testing for prostate cancer, believe strongly in its benefits, and are not deterred by negative affect. Our data suggest that high positive expectations, plus a high desire to comply with physician and family suggestions, result in an increased test intention. Informed consent assessment, therefore, requires an appreciation not only of patient risk, but awareness of patient motivation and affect as well.

PMID: 15521978 [PubMed - indexed for MEDLINE]

Posted by at 3:17 PM | Permalink

Related Articles

Cancer chemotherapy by deoxynucleotide depletion and E2F-1 elevation.

Cancer Res. 2005 Sep 1;65(17):7809-14

Authors: Wang A, Li CJ, Reddy PV, Pardee AB

We propose that the lethality of commonly used anticancer drugs, e.g., methotrexate and cis-platinum are due, at least in part, to an increase of the E2F-1-mediated apoptotic cascade. The drugs directly or indirectly decrease deoxynucleoside triphosphates. The E2F family acts to provide control of S phase by transcribing genes required for deoxynucleoside triphosphate and DNA synthesis. Thus, a mechanism for control of E2F-1 is essential, a signal safeguarding against aberrant or uncontrolled cell proliferation. We have proposed a feedback control by NTPs that down-regulates E2F-1. Here, we provide evidence in support of this hypothesis.

PMID: 16140949 [PubMed - indexed for MEDLINE]

Posted by at 1:10 PM | Permalink

Related Articles

Prostate cancer cells promote osteoblastic bone metastases through Wnts.

Cancer Res. 2005 Sep 1;65(17):7554-60

Authors: Hall CL, Bafico A, Dai J, Aaronson SA, Keller ET

Prostate cancer produces painful osteoblastic bone metastases. Although prostate cancer cells produce numerous osteogenic factors, to date, none have been shown to mediate osteoblastic bone metastases in an in vivo model of prostate cancer. Wnts are a large family of proteins that promote bone growth. Wnt activity is antagonized by endogenous proteins including dickkopf-1 (DKK-1). We explored if prostate cancer cells mediate osteoblastic activity through Wnts using DKK-1 as a tool to modify Wnt activity. A variety of Wnt mRNAs were found to be expressed in prostate cancer cell lines and Wnt mRNA expression was increased in primary prostate cancer compared with nonneoplastic prostate tissue. In addition to expressing Wnts, PC-3 prostate cancer cells expressed the Wnt inhibitor DKK-1. To determine if DKK-1 masked Wnt-mediated osteoblastic activity in osteolytic PC-3 cells, the cells were stably transfected with DKK-1 short hairpin RNA. Decreasing DKK-1 enabled PC-3 cells to induce osteoblastic activity, including alkaline phosphatase production and mineralization, in murine bone marrow stromal cells indicating that DKK-1 blocked Wnt-mediated osteoblastic activity in PC-3 cells. Another prostate cancer cell line, C4-2B, induces mixed osteoblastic/osteolytic lesions. To determine if Wnts contribute to C4-2B's ability to induce mixed osteoblastic/osteolytic lesions, C4-2B cells were stably transfected with either empty vector or DKK-1 expression vector to block Wnt activity. The cells were then injected in the tibiae of mice and allowed to grow for 12 weeks. Blocking Wnt activity converted the C4-2B cells to a highly osteolytic tumor. Taken together, these data show that Wnts contribute to the mechanism through which prostate cancer induces osteoblastic activity.

PMID: 16140917 [PubMed - indexed for MEDLINE]

Posted by at 1:41 PM | Permalink

Related Articles

Differential expression of steroid receptors in prostate tissues before and after radiation therapy for prostatic adenocarcinoma.

Int J Cancer. 2005 Nov 10;117(3):381-6

Authors: Torlakovic E, Lilleby W, Berner A, Torlakovic G, Chibbar R, Furre T, Foss SD

The expression, distribution and the role of steroid receptors in benign and malignant untreated prostate tissues is well recognized, however, the status of steroid receptors in prostate after radiotherapy (RT) for adenocarcinoma has not yet been studied fully. Immunohistochemical evaluation of androgen receptor (AR), estrogen receptor-alpha (ER-alpha), estrogen receptor-beta (ER-beta), and progesterone receptor (PR) was carried out in prostate needle biopsies obtained before and after radiotherapy from 60 patients with adenocarcinoma. The ER-beta transcripts were also studied by RT-PCR in LNCaP prostate carcinoma cell line before and 24 hr after gamma-irradiation at 0.5 Gy and 8.0 Gy. Significantly higher level of ER-beta expression was found in post-radiation samples of prostate adenocarcinoma and benign epithelium. After RT, all steroid receptors were upregulated in prostatic stroma. Tumor AR expression did not change significantly. Although a positive association between AR and ER-beta expression was observed in pre-treatment prostate adenocarcinoma, it was lost after RT suggesting that these 2 steroid receptors respond differently to RT. High levels of pretreatment tumor ER-beta were associated with local recurrence after RT and decreased biochemical recurrence-free survival (p = 0.028). LNCaP cell line that expressed no ER-beta mRNA before gamma-irradiation, clearly expressed ER-beta mRNA 24 hr after 0.5 Gy and 8.0 Gy. Upregulation of all steroid receptors in the prostate stroma and upregulation of ER-beta in the tumor epithelium after RT, may represent a protective tissue response to radiation-induced tissue injury. Although stromal AR was doubled after RT, the tumor and benign epithelium expression of AR seemed resistant to change by RT.

PMID: 15900599 [PubMed - indexed for MEDLINE]

Posted by at 5:23 PM | Permalink

Related Articles

Calcitonin increases invasiveness of prostate cancer cells: role for cyclic AMP-dependent protein kinase A in calcitonin action.

Int J Cancer. 2005 Nov 20;117(4):551-60

Authors: Sabbisetti VS, Chirugupati S, Thomas S, Vaidya KS, Reardon D, Chiriva-Internati M, Iczkowski KA, Shah GV

Calcitonin (CT) is synthesized and secreted in prostate epithelium, and its secretion from malignant prostates is several-fold higher than from benign prostates. CT receptor (CTR) is expressed in malignant prostate epithelium, and its activation stimulates growth of prostate cancer (PC) cells via activation of adenylyl cyclase and calcium/phospholipid pathways. To identify the role of "CT System" in prostate cancer, we tested the expression of CT and CTR mRNAs in invading tumor cells of prostate cancer specimens. The effect of CT on in vitro invasion of PC cell lines and on activation of gelatinases was also examined. The cells of primary tumors and those invading stroma co-expressed CT/CTR mRNAs. Exogenously added CT increased in vitro invasion of PC cell lines and caused a rapid, several-fold but transient increase in protein kinase A activity. In contrast, anti-CT serum caused a dose-dependent inhibition of in vitro invasion of PC-3M cells. CT also increased the concentration and activities of MMP-2 and MMP-9. Rp.cAMP, a competitive inhibitor of cAMP-dependent protein kinase A, myristoylated protein kinase A inhibitory peptide (PKI) as well as the expression of dominant negative form of PKA all attenuated basal in vitro invasion of PC-3M cells, and CT could not increase in vitro invasiveness in their presence. These results suggest that overexpression of "CT System" in invasive PC tumors significantly contributes to increased invasiveness of prostate cancer cells. The action of CT may be mediated by protein kinase A signaling, which subsequently leads to increased cell invasion and secretion of gelatinases.

PMID: 15929083 [PubMed - indexed for MEDLINE]

Posted by at 12:33 PM | Permalink

Related Articles

Leptin gene polymorphisms and their phenotypic associations.

Vitam Horm. 2005;71:373-404

Authors: van der Lende T, Te Pas MF, Veerkamp RF, Liefers SC

In an era of rapidly increasing prevalence of human obesity and associated health problems, leptin gene polymorphisms have drawn much attention in biomedical research. Leptin gene polymorphisms have furthermore drawn much attention from animal scientists for their possible roles in economically important production and reproduction traits. Of the polymorphisms reported for exonic, intronic, and promoter regions of the leptin gene, 16 have been included in association studies in humans, 19 in cattle, and 6 (all exonic or intronic) in pigs. In humans, associations have been found with overweight or (early-onset) obesity, non-insulin-dependent diabetes mellitus, prostate cancer, and non-Hodgkin's lymphoma. In cattle, associations have been found with feed intake, milk yield traits, carcass traits, and reproduction-related traits, and in pigs with feed intake, average daily gain, carcass traits (backfat/leanness), and reproduction performance traits. Many of the polymorphisms were only included in a limited number of association studies, or the phenotypes studied varied largely for a given polymorphism between studies. Therefore, many of the associations found for these polymorphisms need to be confirmed in future studies before firm conclusions can be drawn.

PMID: 16112275 [PubMed - indexed for MEDLINE]

Posted by at 4:50 PM | Permalink