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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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          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

          Hormone Research in Paediatrics
          S. Karger AG
          26 November 2008
          : 21
          : 3
          : 168-174
          aBarrow Neurological Institute, St. Joseph’s Hospital and Medical Center; bMaricopa Medical Center, Phoenix, Ariz., USA
          180042 Horm Res 1985;21:168–174
          © 1985 S. Karger AG, Basel

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          Pages: 7


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