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Inhibition by corpora atretica of ovarian sensitivity to environmental and hormonal stimulation in the lizard, Anolis carolinensis.

Female Anolis carolinensis are sexually refractory to both environmental and hormonal stimulation immediately following the breeding season. This refractory period coincides with the appearance of corpora atretica (CA). Two-approaches were used to determine whether the presence of the CA might be responsible for this decreased sensitivity. Exposure of refractory females to a stimulatory environmental regime demonstrated that vitellogenesis is inversely related to the occurrence of CA. Secondly, treatment of refractory females with ovine FSH (either 10 or 50 μg on alternate days for 16 days), demonstrated that removal of the CA increased ovarian and oviducal responsiveness to exogenous gonadotropin by at least 5-fold. These data indicate that the CA maintain sexual refractoriness by suppressing ovarian sensitivity to both environmental and hormonal stimulation.(Endocrinology 95: 102, 1974)