当前位置： SCI文献检索 > GENERAL AND COMPARATIVE ENDOCRINOLOGY期刊下所有文献 > In vitro study of the direct ovarian effects of gonadotropin-releasing hormone (GnRH) in the frogs, Rana pipiens and Rana catesbeiana.

In vitro study of the direct ovarian effects of gonadotropin-releasing hormone (GnRH) in the frogs, Rana pipiens and Rana catesbeiana.

Abstract：

:Ovaries from the leopard frog, Rana pipiens, and bullfrog, R. catesbeiana, were used to study potential direct extrapituitary effects of gonadotropin-releasing hormone (GnRH). GnRH alone did not alter steroid secretion from ovaries in either species. Ovarian fragments containing mature follicles from R. pipiens were incubated in several submaximal doses of homologous pituitary homogenate or purified bullfrog luteinizing hormone (LH) together with 1000 ng/ml GnRH. The addition of GnRH failed to alter testosterone (T) or progesterone secretion or germinal vesicle breakdown over a wide dose range of gonadotropin. The effects of supramaximal doses of pituitary homogenate on R. pipiens and the effects of homologous LH on T secretion by fragments of R. catesbeiana ovaries were also unaffected by the presence of GnRH. The lack of a GnRH effect on the dynamics of T secretion in the bullfrog was further confirmed in a superfusion system with homologous pituitary homogenate. This study fails to demonstrate an action of GnRH at the level of the ovary in two ranid species.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Hubbard GM,Licht P

doi

10.1016/0016-6480(85)90309-0

subject

Has Abstract

pub_date

1985-11-01 00:00:00

pages

154-61

issue

2

eissn

0016-6480

issn

1095-6840

journal_volume

60

pub_type

杂志文章

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