Reduced phospholipase A2 activity is not accompanied by reduced arachidonic acid release

H Goldberg, P Maxwell, N Hack, K Skorecki, Alexander Maxwell

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Arachidonic acid release in cells highly over expressing cytosolic phospholipase A2 has been attributed to mitogen-activated protein kinase phosphorylation of cytosolic phospholipase A2 on serine-505. To investigate the role of cytosolic phospholipase A2 in cellular physiology, we attempted to inhibit cytosolic phospholipase A2 in the intact cell employing an antisense RNA strategy. Swiss 3T3 cells were stably transfected with an antisense cytosolic phospholipase A2 expression vector. A clone of cells with reduced immunodetectable cytosolic phospholipase A2, compared to a vector transfected cell line, was identified by Western blotting and a corresponding decrease in phospholipase A2 activity was confirmed by enzymatic assay in cell free extracts. However, arachidonic acid release from intact cells in response to agonists was not different between antisense and control cell lines. Thus, arachidonic acid release in intact cells with decreased cytosolic phospholipase A2 activity is likely to be modulated by rate limiting factors that are extrinsic to cytosolic phospholipase A2.
Original languageEnglish
Pages (from-to)220-7
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume198
Issue number1
DOIs
Publication statusPublished - 14 Jan 1994

Keywords

  • 3T3 Cells
  • Animals
  • Arachidonic Acid
  • Blotting, Western
  • Calcimycin
  • Calcium-Calmodulin-Dependent Protein Kinases
  • Cytosol
  • Gene Expression
  • Genetic Vectors
  • Kinetics
  • Mice
  • Phospholipases A
  • Phospholipases A2
  • Platelet-Derived Growth Factor
  • RNA, Antisense
  • Tetradecanoylphorbol Acetate
  • Transfection

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