title: Plasma sex hormone concentrations during the reproductive cycle in the male lizard, Podarcis s. sicula.
abstract: Progesterone, 17-hydroxyprogesterone, androstenedione, 5 alpha-dihydrotestosterone, dehydroepiandrosterone, testosterone and oestradiol concentrations in the plasma were measured by simultaneous radioimmunoassay in males of the lizard Podarcis s. sicula. Hormonal determinations were performed at monthly intervals from January to December (except for August). Testosterone and androstenedione reached peak values of 174.8 ng/ml and 21.4 ng/ml in the mating season (spring) and then testosterone fell abruptly to 5.9 ng/ml in June remaining at this level during hibernation when dehydroepiandrosterone (DHA) reached a maximal level of 28.5 +/- 9.3 ng/ml. Castration resulted in a marked decrease of testosterone, androstenedione, dihydrotestosterone and DHA values, with DHA being significantly lowered only during the winter season. In castrated animals, however, testosterone and androstenedione persisted conspicuously in the plasma during the breeding period, suggesting that adrenal sex steroid output may change during the annual reproductive cycle. In intact animals, progesterone and oestradiol exhibited peak values during the refractory period after the mating season. We suggest a probable role of oestradiol in the induction of the refractory period in this lizard.
authors: Dipartimento di biologia cellulare Università della Calabria, Arcavacata di Rende-Cosenza, Italy.
authors: S
authors: S
authors: Andò
authors: M L
authors: ML
authors: Panno
authors: G
authors: G
authors: Ciarcia
authors: E
authors: E
authors: Imbrogno
authors: M
authors: M
authors: Buffone
authors: E
authors: E
authors: Beraldi
authors: D
authors: D
authors: Sisci
authors: F
authors: F
authors: Angelini
authors: V
authors: V
authors: Botte
mesh_terms: D019326:17-alpha-Hydroxyprogesterone; D000735:Androstenedione / Q000097:blood; D000818:Animals; D003687:Dehydroepiandrosterone / Q000097:blood; D013196:Dihydrotestosterone / Q000097:blood; D004958:Estradiol / Q000097:blood; D012739:Gonadal Steroid Hormones / Q000097:blood*; D006605:Hibernation / Q000502:physiology; D006908:Hydroxyprogesterones / Q000097:blood; D008116:Lizards / Q000097:blood*; D008297:Male; D009919:Orchiectomy; D011374:Progesterone / Q000097:blood; D012098:Reproduction / Q000502:physiology*; D012621:Seasons; D013739:Testosterone / Q000097:blood
chemical_list: D012739:Gonadal Steroid Hormones; D006908:Hydroxyprogesterones; D013196:Dihydrotestosterone; D013739:Testosterone; D000735:Androstenedione; D003687:Dehydroepiandrosterone; D011374:Progesterone; D004958:Estradiol; D019326:17-alpha-Hydroxyprogesterone