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Keywords:

  • programmed cell death;
  • biomembrane;
  • cholesterol;
  • lipoxygenase;
  • phospholipase A2

Abstract

  1. Top of page
  2. Abstract
  3. References

Transforming growth factor β1 (TGFβ1) and cisplatin induce apoptosis (programmed cell death, PCD) in human erythroleukemia K562 cells in an additive manner. After PCD was induced in K562 cells, analysis of phospholipid composition, fatty acids and cholesterol content in their membranes showed a decrease in phosphatidylethanolamine and an increase in phosphatidylserine, cardiolipin and phosphatidic acid. Moreover, cisplatin but not TGFβ1 enhanced sphingomyeline levels in apoptotic cells, whereas TGFβ1 increased the amount of linoleic acid and, more remarkably, of cholesterol. The combination TGFβ+ cisplatin produced membrane changes similar to those provoked by each inducer individually. Furthermore, the specific activities of 5-lipoxygenase and cytosolic phospholipase A2, both modulating the physical properties of membranes and membrane-lipid-mediated intracellular signalling, were enhanced by treatment with TGFβ1 or TGFβ1 + cisplatin. These findings highlight the profound changes in cell membranes during the biochemical events of the apoptotic pathway.

Abbreviations
PCD

programmed cell death

TGFβ1

transforming growth factor β1

sPLA2

secretory phospholipase A2

cPLA2

cytosolic phospholipase A2

D4Ach

arachidonic acid

5-HPD4Ach

5-hydroperoxyarachidonic acid

GC/MS

gas chromatography-mass spectrometry

Enzymes
 

Lipoxygenase (EC 1.13.11.12)

 

phospholipase A2 (EC 3.1.1.4)

References

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  2. Abstract
  3. References
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