A gonadotropin-like thermostable peptide, prepared from bovine anterior pituitary, inducing spermiation in the frog Rana esculenta (L.) and binding to a rat ovarian FSH receptor

Renlund, Staffan; Hallin, Per

doi:10.1016/0016-6480(85)90066-8

General and Comparative Endocrinology

1985

DOI: 10.1016/0016-6480(85)90066-8

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A gonadotropin-like thermostable peptide, prepared from bovine anterior pituitary, inducing spermiation in the frog Rana esculenta (L.) and binding to a rat ovarian FSH receptor

Staffan Renlund

Per Hallin

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Cited by 5 publications

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Dopamine regulation of testicular activity in intact and hypophysectomized frogs,Rana esculenta

Minucci¹,

Fasano

D'Antonio

et al. 1993

Experientia

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In intact frogs, both GnRHA and L-dopa were able to increase testicular and plasma androgen levels and to induce spermiation. The dopamine antagonist pimozide inhibited both the effects of L-dopa but not those of GnRHa. Hypophysectomy reduced androgen levels, but spermiation was still induced by both GnRHa and L-dopa, suggesting that these agents can directly influence the testis through a route not involving the pars distalis. Again, pimozide antagonised spermiation induced by L-dopa but not that induced by GnRHa.

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Dopamine regulation of testicular activity in intact and hypophysectomized frogs,Rana esculenta

Minucci¹,

Fasano

D'Antonio

et al. 1993

Experientia

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A gonadotropin releasing hormone analog induces spermiation in intact and hypophysectomized frogs,Rana esculenta

Minucci

Matteo

Baccari³

et al. 1989

Experientia

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The sperm-releasing activity of a gonadotropin releasing hormone (GnRH) agonist, Buserelin (GnRH) and hypophysis homogenate (PD) preparations was studied in intact and hypophysectomized (PDX) frogs, Rana esculenta. In addition, human chorion gonadotropin (hCG) was tested in PDX animals, and GnRH antagonist (GnRHA) treatments were carried out in intact and PDX animals, in combination with the hormonal injections. GnRH or PD treatments were able to elicit spermiation in intact and PDX animals. While GnRH, injected 24 h later, was again effective in inducing spermiation in intact animals, this was not the case in PDX frogs. GnRHA counteracted GnRH effects in intact frogs. Moreover, in PDX animals GnRHA injections counteracted the sperm-releasing activity induced by hCG or GnRH, but failed to inhibit sperm-releasing activity induced by PD homogenate.

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Characterization of a thermostable LH-immunoreactive material from bovine pituitary gland

Hallin

Madej

Renlund

et al. 1987

Comparative Biochemistry and Physiology Part B: Comparative Bio

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A gonadotropin-like thermostable peptide, prepared from bovine anterior pituitary, inducing spermiation in the frog Rana esculenta (L.) and binding to a rat ovarian FSH receptor

Cited by 5 publications

References 22 publications

Dopamine regulation of testicular activity in intact and hypophysectomized frogs,Rana esculenta

Dopamine regulation of testicular activity in intact and hypophysectomized frogs,Rana esculenta

A gonadotropin releasing hormone analog induces spermiation in intact and hypophysectomized frogs,Rana esculenta

Characterization of a thermostable LH-immunoreactive material from bovine pituitary gland

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