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• W2099641275 abstract "The free calcium concentration, [Ca2+]c, in fura-2-loaded rat cerebellar granule cells was investigated by digital imaging during trains of uniform field stimuli in order to compare the ability of calcium channels in somata and neurites to respond to brief, physiologically relevant depolarizations. Very few somata responded to 20 Hz trains of 1 ms pulses, while virtually all neurites showed an extensive increase which was rapidly reversed when stimulation was terminated. In contrast, both somata and neurites responded when cells were depolarized with 50 mM KCI. The field stimuli evoked a tetrodotoxin-sensitive increase in Na+ concentration in both somata and neurites. When 4-aminopyridine, which inhibits delayed K+ currents in these cells, was present during the field stimulus both somata and neurites increased their [Ca2+]c, suggesting that prolongation of the duration of depolarization is required for somatic Ca2+ channel activation. The neurite response did not depend on the orientation of the neurite relative to the applied field. The neurite response was insensitive to nifedipine (1 microM) and omega-agatoxin-IVA (30 nM) but was uniformly inhibited by omega-conotoxin-GVIA (30% inhibition at 1 microM) and omega-conotoxin-MVIIC (44% inhibition at 5 microM). The two inhibitors were not additive. The neurite [Ca2+]c response was insensitive to the combination of ionotropic glutamate receptor antagonists. Field stimulation caused the exocytosis of the fluorescent probe FM1-43 previously loaded during KCI depolarization, suggesting that presynaptic Ca2+ channels contribute to the field-evoked neurite response." @default.
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• W2099641275 date "1995-12-01" @default.
• W2099641275 modified "2023-10-02" @default.
• W2099641275 title "Exocytosis and Selective Neurite Calcium Responses in Rat Cerebellar Granule Cells During Field Stimulation" @default.
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• W2099641275 doi "https://doi.org/10.1111/j.1460-9568.1995.tb01035.x" @default.
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