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. 1987 Aug;84(16):5695–5699. doi: 10.1073/pnas.84.16.5695

Differential expression of opioid peptide genes by testicular germ cells and somatic cells.

D L Kilpatrick, K Borland, D F Jin
PMCID: PMC298929  PMID: 2441391

Abstract

Spermatogenic cells have been previously shown to be a major site of testicular proenkephalin gene expression. Using RNA gel-blot analysis of purified mouse and hamster germ cells and of testes from prepuberal and germ cell-deficient mutant mice, we now have demonstrated that, in addition to its previously described expression by somatic (Leydig) cells, the gene for a second opioid peptide precursor, pro-opiomelanocortin (POMC), is also expressed by spermatogenic cells. Of particular significance is the finding that the RNAs for proenkephalin and POMC are differentially regulated during spermatogenesis. Two forms of POMC RNA were detected in mouse testis, a larger component 675- to 750-nucleotides (nt) in size common to somatic and spermatogenic cells and a smaller 625-nt RNA found only in pachytene spermatocytes. Two distinct, cell-specific proenkephalin RNAs were also shown to be present in mouse testis: a 1700-nt transcript previously shown to be expressed by spermatogenic cells and a 1450-nt form associated with somatic cells. These data suggest that proenkephalin- and POMC-derived peptides are produced by both somatic cells and germ cells in the testis and in germ cells these two families of opioid peptides may function at different stages of spermatogenesis.

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