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. 2001 Jan 1;353(Pt 1):79–90.

Cytosolic phospholipase A2-alpha associates with plasma membrane, endoplasmic reticulum and nuclear membrane in glomerular epithelial cells.

J Liu 1, T Takano 1, J Papillon 1, A Khadir 1, A V Cybulsky 1
PMCID: PMC1221545  PMID: 11115401

Abstract

Eicosanoids mediate complement-dependent glomerular epithelial injury in experimental membranous nephropathy. The release of arachidonic acid from phospholipids by cytosolic phospholipase A(2) (cPLA(2)) is the rate-limiting step in eicosanoid synthesis. The present study examines the association of cPLA(2) with membranes of organelles. Glomerular epithelial cells were disrupted by homogenization in Ca(2+)-free buffer; organelles were separated by gradient centrifugation. The distribution of cPLA(2) and organelles was analysed by immunoblotting with antibodies against cPLA(2) and organelle markers, or by enzyme assay. In cells incubated with or without the Ca(2+) ionophore ionomycin plus PMA, cPLA(2) co-localized with plasma membrane, endoplasmic reticulum and nuclei, but not with mitochondria or Golgi. A greater amount of cPLA(2) was associated with membranes in stimulated cells, but membrane-associated cPLA(2) was readily detectable under resting conditions. The pattern of association of cPLA(2) with membrane in cells treated with antibody and complement was similar to that in cells stimulated with ionomycin plus PMA; however, complement did not enhance the membrane association of cPLA(2) protein. To determine the functional role of membrane association of cPLA(2), phospholipids were labelled with [(3)H]arachidonic acid. Cells were then incubated with or without antibody and complement and were fractionated. Complement induced a loss of radioactivity from the plasma membrane, endoplasmic reticulum and nuclei, but not from the mitochondrial fraction. Thus the release of arachidonic acid by cPLA(2) is due to the hydrolysis of phospholipids at multiple subcellular membrane sites, including the endoplasmic reticulum, plasma membrane and nucleus.

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Selected References

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