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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Sex steroids levels in the plasma and testis during the reproductive cycle of lizard Podarcis s. sicula Raf.

Progesterone ( P), 17-OH-progesterone (17-OH-P), androstenedione (A), dehydroepiandrosterone (DHEA), testosterone ( T), 5 alpha-dihydrotestosterone (5 alpha-DHT), and 17 beta-estradiol (E2) were measured by RIA in plasma and testes of 114 males of the oviparous lizard Podarcis s. sicula raf, a species that displays annual hibernating cycles. Hormones were determined each month from January until December, except for August. Testosterone peaked at 174.8 ng/ml of plasma after emergence (March), while 5 alpha-DHT and A peaked in April. Plasma DHEA increased during hibernation. During the refractory period there were progressive increases in P and E2 plasma levels. The testicular peak of T, in March, coincided with that observed in plasma. The striking increases in testicular T and A in early July occurred at a time when plasma androgen concentrations were low. 5 alpha-DHT increased in April when spermatogenesis with spermiation occurred and then decreased alongside a second peak of T. There is an apparent separation of plasma and testicular androgen concentrations during the reproductive cycle.[1]

References

  1. Sex steroids levels in the plasma and testis during the reproductive cycle of lizard Podarcis s. sicula Raf. Andò, S., Ciarcia, G., Panno, M.L., Imbrogno, E., Tarantino, G., Buffone, M., Beraldi, E., Angelini, F., Botte, V. Gen. Comp. Endocrinol. (1992) [Pubmed]
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