Dissimilar effects of transglutaminase inhibitors on peptide hormone-indiced secretion from testis and pituitary

Inhibitors of transglutaminase (monodansylcadaverine and bacitracin) reduced luteinizing hormone stimulated androgen and adenosine - 3′: 5′ - monophosphate production by testicular tissue but had no inhibitory effect on gonadotropin releasing hormone-stimulated luteinizing hormone secretion by the pituitary. These results indicate that there are differences in the mechanisms by which these polypeptide hormones stimulate hormone secretion and suggest a role for protein cross-linking in the mechanism of luteinizing hormone action in the testis.