Title : Relevance of the low and high affinity thyrotropin-binding sites of human thyroid membranes to the stimulation of adenylate cyclase.

Pub. Date : 1984 Mar

PMID : 6321134






5 Functional Relationships(s)
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1 To assess the relevance of the class of TSH-binding sites characterized by low affinity and high capacity to the stimulation of adenylate cyclase, we studied the interactions of desialylated hCG (as-hCG) and its beta-subunit (as-hCG beta) with human thyroid membranes. Thyrotropin chorionic gonadotropin subunit beta 5 Homo sapiens
2 To assess the relevance of the class of TSH-binding sites characterized by low affinity and high capacity to the stimulation of adenylate cyclase, we studied the interactions of desialylated hCG (as-hCG) and its beta-subunit (as-hCG beta) with human thyroid membranes. Thyrotropin chorionic gonadotropin subunit beta 5 Homo sapiens
3 In low ionic strength buffer, pH 7.8, where both classes of sites are operant, as-hCG fully inhibited and as-hCG beta partially inhibited [125I] bovine (b) TSH binding. Thyrotropin chorionic gonadotropin subunit beta 5 Homo sapiens
4 In contrast, the as-hCG molecule, which interacts with both classes of TSH-binding sites, fully inhibited TSH stimulation of adenylate cyclase. Thyrotropin chorionic gonadotropin subunit beta 5 Homo sapiens
5 In contrast, the as-hCG molecule, which interacts with both classes of TSH-binding sites, fully inhibited TSH stimulation of adenylate cyclase. Thyrotropin chorionic gonadotropin subunit beta 5 Homo sapiens