ISSN:
1420-9071
Schlagwort(e):
Testis
;
spermiation
;
gonadotropins
;
GnRH agonist
;
GnRH antagonist
;
Amphibia
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary 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 spermreleasing activity induced by hCG or GnRH*, but failed to inhibit sperm-releasing activity induced by PD homogenate.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01950175
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