The release in vitro of prostaglandin F2alpha (PGF2alpha), prostaglandin E2 (PGE2), progesterone, androgens and estradiol-17beta by the corpora lutea (CL) of the oviparous lizard, Podarcis s. sicula, was studied. In addition, the in vitro effects of PGF2alpha and PGE2 on sex steroid release by CL were evaluated. Corpora lutea were divided into four types, according to their different developmental stage: CL1 (unshelled eggs in the oviduct); CL2 (shelled eggs in the oviduct); CL3 (eggs laid 6 h previously); CL4 (eggs laid 48 h previously) and were placed into culture. PGF2alpha secretion was highest in CL4 incubated samples and lowest in CL2 and PGE2 was highest in CL1 and CL2. Progesterone secretion was highest in CL2 and lowest in CL4; androgens were not detectable and estradiol-17beta secretion was highest in CL2. PGF2alpha decreased progesterone secreted by CL1, CL2 and CL3, while it did not modify release of androgens and estradiol-17beta. PGE2 did not affect sex steroid release. These data suggest a role of PGF2alpha in inducing luteolysis, while PGE2 could be implied in the maintenance of CL. A role of progesterone during gestation of Podarcis s. sicula was also confirmed.
PGE2-ALPHA, PGE2, PROGESTERONE, AND ESTRADIOL-17-BETA, SECRETION BY THE CORPUS-LUTEUM OF THE OVIPAROUS LIZARD, PODARCIS-SICULA-SICULA - INVITRO STUDIES
DI FIORE, Maria Maddalena;
1993
Abstract
The release in vitro of prostaglandin F2alpha (PGF2alpha), prostaglandin E2 (PGE2), progesterone, androgens and estradiol-17beta by the corpora lutea (CL) of the oviparous lizard, Podarcis s. sicula, was studied. In addition, the in vitro effects of PGF2alpha and PGE2 on sex steroid release by CL were evaluated. Corpora lutea were divided into four types, according to their different developmental stage: CL1 (unshelled eggs in the oviduct); CL2 (shelled eggs in the oviduct); CL3 (eggs laid 6 h previously); CL4 (eggs laid 48 h previously) and were placed into culture. PGF2alpha secretion was highest in CL4 incubated samples and lowest in CL2 and PGE2 was highest in CL1 and CL2. Progesterone secretion was highest in CL2 and lowest in CL4; androgens were not detectable and estradiol-17beta secretion was highest in CL2. PGF2alpha decreased progesterone secreted by CL1, CL2 and CL3, while it did not modify release of androgens and estradiol-17beta. PGE2 did not affect sex steroid release. These data suggest a role of PGF2alpha in inducing luteolysis, while PGE2 could be implied in the maintenance of CL. A role of progesterone during gestation of Podarcis s. sicula was also confirmed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
