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Whole-cell patch clamp and polarographic oxygen partial pressure (pO 2 ) measurements were used to establish the sensitivity of high-voltage-activated (HVA) Ca 2+ channel subtypes of CA1 hippocampal neurons of rats to hypoxic conditions. Decrease of pO 2 to 15-30 mm Hg induced a potentiation of HVA Ca 2+ currents by 94%. Using selective blockers of N- and...
Sphingosylphosphorylcholine (SPC) induces a rapid increase of intracellular Ca2+ concentration in isolated synaptosomes. This effect is dose-dependent and is also dependent on extracellular Ca2+. Sphingosine (SPH) has a smaller effect and treatment with psychosine (PSY) is ineffective, which suggests that phosphorylation of the 1-carbon of SPH is required for the SPC to act as a Ca2+ release agonist...
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