Kl. Deragon et Sa. Sower, EFFECTS OF LAMPREY GONADOTROPIN-RELEASING HORMONE-III ON STEROIDOGENESIS AND SPERMIATION IN MALE SEA LAMPREYS, General and comparative endocrinology, 95(3), 1994, pp. 363-367
The biological activities of lamprey gonadotropin-releasing hormone-II
I (GnRH-III) were determined in the adult male sea lamprey, Petromyzon
marinus. One injection of lamprey GnRH-III at 0.1 or 0.2 mu g/g body
wt stimulated plasma estradiol and progesterone levels in adult male s
ea lampreys undergoing final maturation. Four successive injections of
lamprey GnRH-III at 0.1 mu g/g or lamprey GnRH-I at 0.2 mu g/g induce
d spermiation in 78 or 30% of the lampreys, respectively, compared to
0% in controls by Day 16. In summary, lamprey GnRH-III is biologically
active in stimulating the pituitary-gonadal axis in adult male lampre
ys. (C) 1994 Academic Press, Inc.