Changes in Calcium Influx Affect the Differentiation of Murine Erythroleukaemia Cells

Overview

Journal Biochem J

Specialty Biochemistry

Date 1995 Jan 1

PMID 7826342

Citations 2

Authors

B Sparatore

A Pessino

M Patrone

M Passalacqua

E Melloni

S Pontremoli

Affiliations

Soon will be listed here.

Abstract

As indicated by direct evidence, obtained by altering the cell-membrane permeability for Ca2+ in murine erythroleukaemia (MEL) cells, calpain is the triggering factor which connects fluctuations of the intracellular Ca2+ concentrations to the decay of protein kinase C (PKC), as well as to the kinetics of cell differentiation induced by hexamethylenebisacetamide. Cell exposure to verapamil caused a profound decrease in the rate of PKC down-regulation and a slower initial rate of accumulation of mature erythroid cells, whereas addition of the Ca2+ ionophore A23187 produced opposite effects. The high susceptibility of PKC-delta to calpain degradation, at concentrations of Ca2+ much lower than those required for degradation of the other PKC isoforms, may be explained by the finding that this kinase isoform is predominantly associated with the cell membrane. The different cellular localizations, as well as the different susceptibilities to calpain digestion, further support the hypothesis that in MEL cells the various PKC isoforms play distinct biological functions that are critical for the maintenance of the undifferentiated state of the cell and for its commitment to terminal erythroid differentiation.

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