Title : Beta -Arrestin 1 down-regulation after insulin treatment is associated with supersensitization of beta 2 adrenergic receptor Galpha s signaling in 3T3-L1 adipocytes.

Pub. Date : 2003 Jan 7

PMID : 12509508






1 Functional Relationships(s)
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1 In this study, we show that chronic insulin-treated, beta-arrestin 1depleted 3T3-L1 adipocytes display (i) increased isoproterenol-induced cAMP generation (53 +/- 38% at 1.5 min, 25 +/- 19% at 5 min, 63 +/- 14% at 30 min, and 59 +/- 2% at 60 min), a Galpha(s)-associated pathway; (ii) impaired isoproterenol-induced beta2AR internalization (reduced by 98 +/- 4%), which is required for MAP kinase signaling, a Galpha(i)-associated pathway; and (iii) increased beta-arrestin 1 phosphorylation at Ser-412. Cyclic AMP insulin Homo sapiens