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Effects of lamprey gonadotropin-releasing hormone and analogs on steroidogenesis and spermiation in male sea lampreys.

Abstract：

:The biological activities of lamprey GnRH and analogs were determined in the adult male lamprey,Petromyzon marinus. Two successive injections of lamprey GnRH at 0.005, 0.065 or 0.163 μg/g body weight or [D-Ala(6),Pro(9)-NHEt] mammal GnRH at 0.05 μg/g stimulated plasma estradiol and progesterone levels in adult male lampreys undergoing final maturation. In these experiments, a lamprey GnRH putative antagonist, [D-Phe(2,6),Pro(3)] lamprey GnRH, at 0.075, 0.150 or 0.3 μg/g stimulated plasma estradiol but not progesterone levels. Four successive injections of lamprey GnRH at 0.05 or 0.1 μg/g stimulated plasma progesterone and spermiation. [D-Phe(2,6),Pro(3)] lamprey GnRH at 0.05 or 0.1 μg/g depressed plasma progesterone levels and inhibited spermiation. In contrast, lamprey GnRH analog, [D-Ala(6),Pro(9)-OH free carboxylic acid] lamprey GnRH, at 0.05 or 0.1 μg/g stimulated plasma progesterone levels and inhibited spermiation. In summary, lamprey GnRH is biologically active in stimulating the pituitary-gonadal axis in adult male lampreys as determined by steroidogenesis and spermiation.

journal_name

Fish Physiol Biochem

journal_title

Fish physiology and biochemistry

authors

Sower SA

doi

10.1007/BF00004695

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

101-7

issue

1-6

eissn

0920-1742

issn

1573-5168

journal_volume

7

pub_type

杂志文章

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