This study examined [Ca2+]i oscillations in the human salivary gland cell lines, HSY and HSG. Relatively low concentrations of carbachol (CCh) induced oscillatory, and higher [CCh] induced sustained, steady-state increases in [Ca2+]i and K Ca currents in both cell types. Low IP3, but not thapsigargin (Tg), induced [Ca2+]i oscillations, whereas Tg blocked CCh-stimulated [Ca2+]i oscillations in both cell types. Unlike in HSG cells, removal of extracellular Ca2+ from HSY cells (i) did not affect CCh-stimulated [Ca2+]i oscillations or internal Ca2+ store refill, and (ii) converted high [CCh]-induced steady-state increase in [Ca2+]i into oscillations. CCh- or thapsigargin-induced Ca2+ influx was higher in HSY, than in HSG, cells. Importantly, HSY cells displayed relatively higher levels of sarcoendoplasmic reticulum Ca2+ pump (SERCA) and inositoltrisphosphate receptors (IP3Rs) than HSG cells.
The Journal of Membrane Biology – Springer Journals
Published: Jun 1, 2001
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