Caspase 3 regulates phosphatidylserine externalization and phagocytosis of oxidatively stressed erythrocytes

FEBS Letters
Debabrata MandalJoyoti Basu

Abstract

The appearance of phosphatidylserine (PS) on the outer surface of red cells is an important signal for their uptake by macrophages. We report for the first time that procaspase 3 present in the anucleated mature human erythrocyte is activated under oxidative stress induced by t-butylhydroperoxide leading to impairment of the aminophospholipid translocase, PS externalization and increased erythrophagocytosis. This is the first report linking caspase 3 activation to inhibition of flippase activity and uptake of red cells by macrophages.

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