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- W2014503118 abstract "Calcium (Ca2+) entry upon cell perturbation has been examined in transformed human osteoblast cells (U-2/OS). The cells were deformed by fluid flow from a patch pipette held in proximity to the cell by applying a positive pressure (+50 mm Hg) for the passage of saline over the membrane. Intracellular calcium [Ca2+]i was examined following loading with 5 microM Fura-2 AM. The changes in ratio were determined at 330-ms intervals. Waves of [Ca2+]i were seen spreading along the length of the individual cell following stimulation (n = 30). The initial change in Ca2+ at the site of stimulation occurred within 660 ms after applying the stimulus. Following 1.3 (+/- 0.33) s of raised [Ca2+]i, the values returned to those of predeformation. The Ca2+ response following fluid flow stimulation was blocked by 300 microM Cd2+, a specific blocker of Ca2+ channels, demonstrating an extracellular source of Ca2+. Preincubation with cholera toxin (250 ng/ml for 6 h) prolonged the elevation of Ca2+ induced by fluid flow stimulation (n = 20). In contrast, pertussis toxin (250 ng/ml for 6 h) completely eliminated the Ca2+ response to fluid flow stimulation (n = 20). Cells maintained in solutions free of Ca2+ demonstrated no change in [Ca2+]i. Tetraethylammonium (6 mM) had no effect on the response (n = 10). In addition pretreatment with ryanodine (2 and 10 microM; each group n = 10) in media showed a reduced wave of Ca2+ in response to mechanical deformation. The response to a phospholipase C inhibitor also eliminated the response to the mechanical deformation (n = 10). In addition cells that demonstrated changes in Ca(2+)-containing media lost the ability to respond when EGTA was added to the media. Following this, 2 microM ryanodine was added to the cells, demonstrating a response too small to replicate the fluid flow stimulated wave, but supporting the view that the cells were vital following preincubation." @default.
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- W2014503118 date "1996-02-01" @default.
- W2014503118 modified "2023-10-09" @default.
- W2014503118 title "Calcium Waves in Fluid Flow Stimulated Osteoblasts Are G Protein Mediated" @default.
- W2014503118 doi "https://doi.org/10.1006/abbi.1996.0043" @default.
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