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• W1999536494 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 volume over a period of two hours. The volume of PMNL, however, was normal after 24 hours in vitro incubation studies as well as after 1, 2 and 12 days of streptozotocin-induced hyperglycemia in rats. The results are consistent with the formulation that the osmotic activity (cell shrinkage) of the high glucose concentrations activates G protein(s) which then stimulates the adenylate-cAMP-protein kinase A pathway, phospholipase C system and calcium channels. The stimulation of these cellular pathways permits both calcium influx into the PMNL as well as mobilization of calcium from their intracellular stores. Both of these events contribute to the acute rise in their [Ca2+]i. It is possible that the rise in [Ca2+]i is critical for the stimulation of the events that lead to the generation and accumulation of inorganic osmolytes to restore cell volume to normal." @default.
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• W1999536494 date "1996-12-01" @default.
• W1999536494 modified "2023-10-14" @default.
• W1999536494 title "Pathways through which glucose induces a rise in [Ca2+]i of polymorphonuclear leukocytes of rats" @default.
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• W1999536494 doi "https://doi.org/10.1038/ki.1996.526" @default.
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