AI Article Synopsis
- Inhibin consists of an alpha- and beta-subunit, with the alpha-subunit playing a tumor-suppressive role, particularly down-regulated in human prostate cancer.
- This study focused on the inhibin alpha-subunit gene promoter to investigate if promoter hypermethylation or loss of heterozygosity (LOH) occurred in prostate cancer DNA.
- Significant hypermethylation was found in the gene promoter of advanced prostate cancers, and LOH at a specific chromosomal region was present in 42% of the carcinomas, marking a link between inhibin alpha-subunit gene alterations and prostate cancer.
Article Abstract
Inhibin is composed of an alpha- and a beta-subunit. Transgenic studies assigned a tumor-suppressive role to the inhibin alpha-subunit, and in human prostate cancer inhibin alpha-subunit gene expression was down-regulated. This study examined the inhibin alpha-subunit gene promoter and gene locus to determine whether promoter hypermethylation or LOH occurred in DNA from prostate cancer. The 5'-untranslated region of the human inhibin alpha-subunit gene was sequenced and shown to be highly homologous to the bovine, rat, and mouse inhibin alpha-subunit promoter sequences. A 135-bp region of the human promoter sequence that continued a cluster of CpG sites was analyzed for hypermethylation. Significant (P < 0.001) hypermethylation of the inhibin alpha-subunit gene promoter occurred in DNA from Gleason pattern 3, 4, and 5 carcinomas compared with nonmalignant tissue samples. A subset of the carcinomas with a cribriform pattern were unmethylated. LOH at 2q32-36, the chromosomal region harboring the inhibin alpha-subunit gene, was observed in 42% of prostate carcinomas. These data provide the first demonstration that promoter hypermethylation and LOH are associated with the inhibin alpha-subunit gene and gene locus in prostate cancer.
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| http://dx.doi.org/10.1210/mend.16.2.0771 | DOI Listing |
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