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RhoA/ROCK I signalling downstream of the P2Y13 ADP-receptor controls HDL endocytosis in human hepatocytes.

Abstract：

:Cell surface receptors for high-density lipoprotein (HDL) on hepatocytes are major partners in the regulation of cholesterol homeostasis. We have previously demonstrated on human hepatocytes that apolipoprotein A-I binding to an ectopic F(1)-ATPase stimulates the production of extracellular ADP that activates a P2Y(13)-mediated high-density lipoprotein (HDL) endocytosis pathway. However, P2Y(13)-dependent signalling pathway has never been described yet. The current study demonstrates a major role of cytoskeleton reorganization in F(1)-ATPase/P2Y(13)-dependent HDL endocytosis under the control of the small GTPase RhoA and its effector ROCK I. Indeed human hepatocytes (HepG(2) cells) stimulated by ADP or AR-C69931MX (both P2Y(13) agonists) showed a high specific activation of RhoA; in addition, inhibition of Rho proteins by C3 exoenzyme impairs HDL endocytosis whereas a constitutively active form of RhoA stimulates HDL endocytosis at the same level as under F(1)-ATPase/P2Y(13) activation. Pharmacological inhibition of ROCK activity decreased HDL endocytosis following stimulation by apoA-I (F(1)-ATPase ligand), ADP or AR-C69931MX and specific siRNA ROCK I extinction prevented the stimulation of HDL endocytosis without effect of ROCK II extinction. The functional involvement of ROCK I downstream F(1)-ATPase/P2Y(13) was confirmed by the strong enrichment of the membrane fraction in ROCK I and by the requirement of actin polymerization in hepatocyte HDL endocytosis. These results allow the identification of the molecular events downstream P2Y(13) receptor activation for a better understanding of hepatocyte HDL endocytosis, the latest step in reverse cholesterol transport.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Malaval C,Laffargue M,Barbaras R,Rolland C,Peres C,Champagne E,Perret B,Tercé F,Collet X,Martinez LO

doi

10.1016/j.cellsig.2008.09.016

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

120-7

issue

1

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(08)00291-X

journal_volume

21

pub_type

杂志文章

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