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Activation of membrane-bound phospholipase D by protein kinase C in HL60 cells: synergistic action of a small GTP-binding protein RhoA.

Abstract：

:Regulation of phospholipase D (PLD) activation by protein kinase C (PKC) was studied in membranes isolated from human promyelocytic leukemia HL60 cells. The activation of membrane-bound PLD by PKC partially purified from rat brain was most effectively induced with phorbol 12-myristate 13-acetate (PMA) and Ca2+ (1 microM) which caused translocation of PKC to membranes. Ro31-8425, a potent inhibitor of PKC, suppressed the catalytic activity of PKC in a concentration-dependent manner, with complete inhibition at 5 microM. However, the PKC-mediated PLD activation was not affected by Ro31-8425. It was thus suggested that membrane-bound PLD of HL60 cells was activated by PKC translocation but probably via a phosphorylation-independent mechanism. Furthermore, addition by guanosine 5'-3-O-(thio)trisphosphate (GTP gamma S) potentiated the PKC-mediated PLD activation and this potentiating effect was abolished by Rho GTPase dissociation inhibitor (RhoGDI). The suppressed PLD activation by RhoGDI was completely restored by addition of recombinant RhoA. These results indicate that the PKC-mediated PLD activation can be synergistically potentiated by RhoA in HL60 membranes.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Ohguchi K,Banno Y,Nakashima S,Nozawa Y

doi

10.1006/bbrc.1995.1811

subject

Has Abstract

pub_date

1995-06-06 00:00:00

pages

306-11

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(85)71811-6

journal_volume

211

pub_type

杂志文章

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