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  • Title: [Signal transduction of the thyrotropin receptor].
    Author: Kosugi S, Mori T.
    Journal: Nihon Rinsho; 1994 Apr; 52(4):984-9. PubMed ID: 8196191.
    Abstract:
    The thyrotropin receptor (TSHR) mediates dual signalling, cAMP and phosphoinositide (PIP2) responses. We have characterized the roles of the 2nd and 3rd cytoplasmic loops on signal transduction by site-directed mutagenesis. Middle portion in the 2nd loop (residues 525-527) is found to be important for Gs coupling. On the other hand, N- and C-terminal regions of the 3rd loop and residues 528-532 in the 2nd loop are important for Gq coupling. Further, mutations involving residue 617-620 in the 3rd loop result in constitutive activation. Constitutively activating mutations of the TSHR and LH/CGR (lutropin/choriogonadotropin receptor) are found in functional thyroid adenoma and familial male precocious puberty, respectively, and appear to be the direct cause of each disease.
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