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      Temporal Difference of Thyrotropin-Releasing Hormone in Prevention of Testicular Regression in Golden Hamsters Exposed to Short Photoperiods: Possible Involvement of β-Endorphin

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          Abstract

          Male golden hamsters were exposed to long photoperiod or short photoperiod (SP) and injected with 1 µg TRH and/or 1 µg LHRH at lights on (LO) or lights off (LX) for a total of 8 weeks. Both TRH and LHRH prevented testicular regression if they were injected at LO. Injected at LX, TRH did not prevent testicular regression, and LHRH was only partially effective. Plasma β-endorphin levels were significantly higher in groups with atrophic testes. These results indicate that TRH like LHRH can prevent SP-induced testicular regression in hamsters by some unknown mechanism and that β-endorphin may be involved in the control of testicular function in hamsters.

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          Author and article information

          Journal
          HRE
          10.1159/issn.0018-5051
          Hormone Research in Paediatrics
          S. Karger AG
          0018-5051
          2571-6603
          1985
          1985
          26 November 2008
          : 21
          : 3
          : 168-174
          Affiliations
          aBarrow Neurological Institute, St. Joseph’s Hospital and Medical Center; bMaricopa Medical Center, Phoenix, Ariz., USA
          Article
          180042 Horm Res 1985;21:168–174
          10.1159/000180042
          © 1985 S. Karger AG, Basel

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          Page count
          Pages: 7
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