, Volume 36, Issue 12, pp 1426–1427 | Cite as

Daily melatonin injections inhibit short-day-induced testicular regression in hamsters

  • F. W. Turek
  • P. Pappas


Daily injections of melatonin were found to retard testicular regression in hamsters exposed to LD 10:14, if the injections occurred in the morning (i.e., 0.5 h after lights on), but not if they occurred in the afternoon (i.e., 6 h after lights on). These results indicate that appropriately timed injections of melatonin can at least partially block the inhibitory effects of short days on gonadal activity in the photoperiodic hamster.


Melatonin Daily Injection Gonadal Activity Melatonin Injection Testicular Regression 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 2.
    R. J. Reiter, M. K. Vaughan and P. J. Waring, Acta endocr.84, 410 (1977).Google Scholar
  2. 3.
    F. W. Turek, Biol. Reprod.20, 1119 (1979).Google Scholar
  3. 4.
    R. J. Reiter, D. E. Blask, L. Y. Johnson, P. K. Rudeen, M. K. Vaughan and P. J. Waring, Neuroendocrinology22, 107 (1976).Google Scholar
  4. 5.
    B. Goldman, V. Hall, C. Hollister, P. Roychoudhury, L. Tamarkin and W. Westrom, Endocrinology104, 82 (1979).Google Scholar
  5. 6.
    F. W. Turek and S. H. Losee, Biol. Reprod.18, 299 (1978).Google Scholar
  6. 7.
    L. Tamarkin, W. K. Westrom, A. I. Hamill and B. D. Goldman, Endocrinology99, 1534 (1976).Google Scholar
  7. 8.
    F. W. Turek, Proc. Soc. exp. Biol. Med.155, 31 (1977).Google Scholar
  8. 9.
    E. L. Bittman, Science202, 648 (1978).Google Scholar

Copyright information

© Birkhäuser Verlag 1980

Authors and Affiliations

  • F. W. Turek
    • 1
  • P. Pappas
    • 1
  1. 1.Department of Biological SciencesNorthwestern UniversityEvanstonUSA

Personalised recommendations