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• W2122012166 abstract "Vanadate is a commonly used Ca2+pump blocker, exerting a substantial effect on Ca2+extrusion at millimolar concentrations in human red cells. At such levels, vanadate also seems to open an L type-like Ca2+channel in these cells (J Biol Chem 257 (1982) 7414; Gen Physiol Biophys 16 (1997) 359). Since neither a dose-dependence effect nor a metabolic requirement for the latter action could be found in the literature, we have addressed this matter in the present work. Accordingly, vanadate action on Ca2+entry was systematically investigated in both young and old human red cells after metabolic depletion. Although vanadate enhanced Ca2+entry indifferently in either cell type, a distinct over-all effect was paradoxically found depending on whether or not metabolic substrates that give rise to ATP were present. In ATP-depleted cells, unlike with ATP-containing cells, vanadate-stimulated Ca2+entry was neither blocked by raising external K+nor by adding voltage-dependent Ca2+channel blockers (nifedipine, calciseptine, FTX3.3) or compounds affecting polyphosphoinositide metabolism (Li+, neomycin). Likewise, full substitution of external Na+by other cations did not inhibit vanadate-enhanced Ca2+entry. Regardless of the cell age, stimulation by vanadate depended strongly on internal Na+(0–30 mM). Vanadate stimulation was significantly reduced (about 55%) by heparin (10 mg/ml) only in young cells and by ryanodine (about 35%, 250 μM) in old cells. The results suggest presence of a new vanadate-induced Ca2+entry pathway in ATP-depleted cells." @default.
• W2122012166 created "2016-06-24" @default.
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• W2122012166 date "2003-11-01" @default.
• W2122012166 modified "2023-09-29" @default.
• W2122012166 title "New vanadate-induced Ca2+pathway in human red cells" @default.
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• W2122012166 doi "https://doi.org/10.1016/j.cellbi.2003.07.002" @default.
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