PMID: 8597589Feb 16, 1996Paper

Arachidonate mobilization is coupled to depletion of intracellular calcium stores and influx of extracellular calcium in differentiated U937 cells

Biochimica Et Biophysica Acta
B A RzigalinskiM D Rosenthal

Abstract

We have previously reported that dimethylsulfoxide-differentiation of U937 cells induced significant A23187-stimulatable arachidonate mobilization, consistent with characteristics of cytosolic phospholipase A2 (Rzigalinski, B.A. and Rosenthal, M.D. (1994) Biochim. Biophys. Acta 1223, 219-225). The present report demonstrates that differentiated cells attained higher elevations of intracellular free calcium in response to A23187 and thapsigargin, consistent with enhancement of the capacitative calcium influx pathway. Differentiation induced as significant increase in the size of the intracellular calcium stores, as well as in the capacity for store-activated calcium influx. Alterations in the capacitative calcium influx pathway were coupled to differentiation-induced activation of cPLA2 and mobilization of arachidonate in response to thapsigargin and fMLP stimulation. Although cPLA2 activity is often associated with influx of extracellular calcium, arachidonate mobilization in response to thapsigargin or fMPL was not simply a consequence of calcium influx. Assessment of intracellular free calcium elevations during thapsigargin or fMPL-induced stimulation suggest that a low level of arachidonic acid release was initiated upon rel...Continue Reading

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