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2000 | 47 | 3 | 591-599
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Participation of phospholipase A2 isoforms in the control of calcium influx into electrically non-excitable cells

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The participation of phospholipase A2 isoforms in capacitative store-operated Ca2+ influx into Jurkat leukemic T and MDCK cells was investigated. Preincubation of Jurkat cells with either bromophenacyl bromide (an inhibitor of secreted phospholipase A2, sPLA2) or Helss (an inhibitor of calcium independent phospholipase A2 - iPLA2) resulted in a significant inhibition of the calcium influx. The extent of this inhibition depended on the pH of the extracellular millieu; it increased with alkalisation. The rate of Ca2+ influx into MDCK cells was reduced by bromophenacyl bromide. Preincubation of these cells with Helss resulted in the stimulation of the influx. These observations suggest the participation of different PLA2 isoforms in the regulation of Ca2+ influx. They also show that the extent that PLA2 isoforms control the influx depends on the pH of the medium. Finally, these data indicate that various phospholipase A2 isoforms may play a role in the control of Ca2+ influx in different cell lines.
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  • Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, L. Pasteura 3, 02-093 Warszawa, Poland
  • Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, L. Pasteura 3, 02-093 Warszawa, Poland
  • Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, L. Pasteura 3, 02-093 Warszawa, Poland
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