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    Biochem Biophys Res Commun. 1994 Jul 29;202(2):1188-95.

    Human somatostatin receptor, SSTR2, is coupled to adenylyl cyclase in the presence of Gi alpha 1 protein.

    Kagimoto S, Yamada Y, Kubota A, Someya Y, Ihara Y, Yasuda K, Kozasa T, Imura H, Seino S, Seino Y.

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    Department of Metabolism and Clinical Nutrition, Kyoto University Faculty of Medicine, Japan.

    Abstract

    Somatostatin has been shown to exert diverse biological effects in various tissues. Recently, the human genes encoding five subtypes of somatostatin receptor (SSTR1-SSTR5) were cloned. Among these subtypes SSTR2 is present in many endocrine tumors as well as normal tissues and may mediate the effects of somatostatin analog, SMS201-995. In this study, we have investigated the intracellular effect of SSTR2 stably expressed in Chinese hamster ovary cells. Somatostatin-14 does not affect the forskolin stimulated cAMP formation when human SSTR2 is expressed in CHO cells, which lack internal Gi alpha 1 protein. However, somatostatin-14 inhibits the adenylyl cyclase in a dose dependent and pertussis toxin-sensitive manner when human SSTR2 is co-expressed with Gi alpha 1 in CHO cells. These results indicate that human SSTR2 is functionally coupled to Gi alpha 1 protein but not to Gi alpha 2 or Gi alpha 3 when expressed in CHO cells.

    PMID:
    7914078
    [PubMed - indexed for MEDLINE]

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