Sexual differences in Salmon gonadotropin

Bernard Breton (1) , Patrick Prunet (1) , Pierrette Reinaud (1)

1 Laboratoire de physiologie des poissons

Salmon (Oncorhynchus tschawytscha) GTH's were purified from a mixture of pituitaries of both sexes or from separate male and female glands. Some of their biochemical, immunological and biological properties have been compared. These hormones differed essentially in amino acid composition, especially lysine, histidine and half cystine residues, and by the presence of -amino (or -aminoiso) butyric acid in male and GTH II preparations. The same differences were found between GTH I-II and GTH male-female. Observed biochemical differences were sex-linked; they did not influence immunological and qualitative biological effects, but could determine the affinity of the GTH of each sex or its specific receptors.

Mots clés: fish; salmonidae; oncorhynchus tschawytscha; reproduction; sexual differenciation; gonadotropin

Domaines: Biologie animale; Biochimie [q-bio.BM]; Biophysique

Bernard Breton, Patrick Prunet, Pierrette Reinaud. Sexual differences in Salmon gonadotropin. Annales de biologie animale, biochimie, biophysique, 1978, 18 (4), pp.759-765. ⟨10.1051/rnd:19780501⟩. ⟨hal-00897343⟩