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Syrian hamster proopiomelanocortin cDNA cloning and early seasonal changes in testicular expression
Caurnel Morgan1, Robert C Thompson, Stanley J Watson
1Mental Health Research Institute, University of Michigan, Ann Arbor, MI 48109, USA. cam2025@med.cornell.edu
Abstract:
Beta-endorphin (beta-End) and its precursor, proopiomelanocortin (POMC), are expressed in testis and beta-End stimulates testosterone secretion locally. We measured POMC expression in Syrian hamster testis following transfer from long days (LDs) to short days (SDs). We used RT-PCR to amplify partial-length hamster POMC cDNA to generate a probe for Northern analysis. We also used rat beta-End antiserum for radioimmunoassay analysis. SD exposure for 2 weeks decreased POMC mRNA and beta-End, but not testis weight or testosterone. We conclude that POMC signaling may play a role in seasonal regulation of testicular function.
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