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The beta2-adrenergic receptor specifically sequesters Gs but signals through both Gs and Gi/o in rat sympathetic neurons.

Abstract：

:Beta(2)-adrenergic receptors (beta(2)-AR) and CB1 cannabinoid receptors share the property of being constitutively active. The CB1 cannabinoid receptor can also sequester G(i/o) proteins; however, it is not known whether the beta(2)-AR can also sequester G proteins. Beta(2)-ARs were heterologously expressed in rat superior cervical ganglion neurons by microinjection of cDNA and studied using the patch-clamp technique. The beta-AR agonist isoproterenol increased the Ca(2+) current 25.9+/-1.6% in neurons microinjected with 100 ng/microl beta(2)-AR cDNA but was without effect on control neurons. Pretreatment with cholera toxin (CTX) abolished the effect of isoproterenol, indicating coupling via G(s) proteins. In neurons microinjected with 200 ng/microl beta(2)-AR cDNA, isoproterenol had the opposite effect of inhibiting the Ca(2+) current 36.5+/-2.0%. Inhibition of the Ca(2+) current was sensitive to pertussis toxin, indicating beta(2)-AR coupling to G(i/o) proteins. Pretreatment with CTX resulted in a greater 54+/-3.8% inhibition of the Ca(2+) current, indicating that G(s) coupling masks the full effect of G(i/o) coupling. Expression of beta(2)-ARs abolished signaling by G(s)-coupled receptors for vasoactive intestinal polypeptide (VIP). VIP inhibited the Ca(2+) current 49.5+/-0.5% in control neurons but had no effect in neurons expressing beta(2)-ARs. In contrast, expression of beta(2)-ARs had no effect on signaling by the G(i/o)-coupled alpha(2)-adrenergic receptor. This study demonstrates that the beta(2)-AR couples to both G(s) and G(i/o) proteins but specifically sequesters G(s) proteins, preventing their interaction with another G(s)-coupled receptor. beta(2)-adrenergic receptors thus have the potential to prevent other G(s)-coupled receptors from transducing their biological signals.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Vásquez C,Lewis DL

doi

10.1016/s0306-4522(03)00024-1

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

603-10

issue

3

eissn

0306-4522

issn

1873-7544

pii

S0306452203000241

journal_volume

118

pub_type

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