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Efficient functional coupling of the human D3 dopamine receptor to G(o) subtype of G proteins in SH-SY5Y cells.

Abstract：

:1 The D3 dopamine receptor presumably activates Gi/Go subtypes of G-proteins, like the structurally analogous D2 receptor, but its signalling targets have not been clearly established due to weak functional signals from cloned receptors as heterologously expressed in mostly non-neuronal cell lines. 2 In this study, recombinant human D3 receptors expressed in a human neuroblastoma cell line, SH-SY5Y, produced much greater signals than those expressed in a human embryonic kidney cell line, HEK293. Quinpirole, a prototypic agonist, markedly inhibited forskolin-stimulated cyclic AMP production and Ca2+-channel (N-type) currents in SH-SY5Y cells, and enhanced GTPgamma35S binding in isolated membranes, nearly ten times greater than that observed in HEK293 cell membranes. 3 GTPgamma35S-bound Galpha subunits from quinpirole-activated and solubilized membranes were monitored upon immobilization with various Galpha-specific antibodies. Galphao subunits (not Galphai) were highly labelled with GTPgamma35S in SH-SY5Y, but not in HEK293 cell membranes, despite their abundance in the both cell types, as shown with reverse transcription-polymerase chain reaction and Western blots. N-type Ca2+ channels and adenylyl cyclase V (D3-specific effector), on the other hand, exist only in SH-SY5Y cells. 4 More efficient coupling of the D3 receptor to Go subtypes in SH-SY5Y than HEK293 cells may be attributed, at least in part, to the two D3 neuronal effectors only present in SH-SY5Y cells (N-type Ca2+-channels and adenylyl cyclase V). The abundance of Go subtypes in the both cell lines seems to indicate their availability not a limiting factor.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Zaworski PG,Alberts GL,Pregenzer JF,Im WB,Slightom JL,Gill GS

doi

10.1038/sj.bjp.0702905

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

1181-8

issue

6

eissn

0007-1188

issn

1476-5381

journal_volume

128

pub_type

杂志文章

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