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Protein Kinase C-dependent Phosphorylation of Annexins I and II in Mesangial Cells

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Journal Biochem J
Specialty Biochemistry
Date 1993 May 15
PMID 8503863
Citations 7
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Abstract

In this study we describe the phosphorylation of annexins from cultured rat mesangial cells by protein kinase C (PKC) both in vitro and in vivo. Annexins I and II were detected either by Western-blot analysis or by immunoprecipitation using specific antibodies. In the presence of [gamma-32P]ATP, cytosolic annexin I and annexin II were phosphorylated in vitro only when Ca2+ and phospholipids were added, but not in the presence of phospholipids alone. Annexin I was shown to be a better substrate than annexin II. In experiments in vivo performed on 32P-labelled mesangial cells, the addition of two well-known activators of PKC, namely angiotensin II (AII) and phorbol myristate acetate (PMA), increased preferentially the phosphorylation of annexin I. Annexin II was phosphorylated to a much lesser extent after AII treatment. Phosphoamino acid analysis of annexins, either by two-dimensional chromatography or by using a specific antiphosphotyrosine antibody, revealed only phosphoserine in these experiments in vivo. The addition of AII to mesangial cells increased serine phosphorylation of annexin I and annexin II, whereas PMA only increased serine phosphorylation of annexin I. V8-protease phosphopeptide mapping of annexin I that was phosphorylated both in vitro and in vivo by PKC from mesangial cells shows similar phosphopeptides.

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