Pathways through which glucose induces a rise in [Ca2+]i of polymorphonuclear leukocytes of rats

Kidney International
T M DemerdashS G Massry

Abstract

Basal levels of [Ca2+]i are elevated in diabetes mellitus. Such an abnormality is most likely due to both increased calcium influx into cells and decreased efflux of this ion out of the cells. The present study examined the cellular pathways that are responsible for hyperglycemia-induced acute rise in polymorphonuclear leukocytes (PMNL), and explored whether such a rise is due to increased calcium entry into PMNL and/or to calcium release from their intracellular stores. There were dose dependent and time dependent rises in the [Ca2+]i of PMNL exposed to high concentrations of glucose. Similar effects were observed when the PMNL were exposed to high concentrations of choline chloride or mannitol. A substantial part of the rise in [Ca2+]i was inhibited when the media contained verapamil or nifedipine or when the PMNL were placed in calcium free media, and the rise in [Ca2+]i was completely abolished when the PMNL were placed in calcium free media containing ryanodine. GDP beta S or pertussis toxin almost completely prevented the glucose-induced rise in [Ca2+]i of PMNL. Rp-cAMP, H-89 or staurosporine produced significant inhibition of the rise in [Ca2+]i. High concentrations of glucose produced a dose dependent shrinkage of PMNL ...Continue Reading

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