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- W2159887029 abstract "Current through voltage-gated calcium channels of rat retinal ganglion cells was recorded using the whole-cell patch-clamp technique. All cells displayed high-voltage-activated currents, and 75% of these also displayed low-voltage-activated (LVA) currents. Currents could be separated on the basis of their voltage/time dependence and sensitivity to nickel ions. The group II metabotropic glutamate receptor (mGluR) agonist (2R,4R)-4-aminopyrrolidine-2,4-dicarboxylate (APDC; 100 microM) increased LVA current by 40% as did the nonselective mGluR agonist (+/-)-1-aminocyclopentane-trans-1,3-dicarboxylic acid (tACPD; 100 microM). Neither the group I mGluR agonist (S)-3,5-dihydroxyphenylglycine (100 microM) nor 5-hydroxytryptamine (100 microM) enhanced LVA current. In the presence of (S)-alpha-methyl-4-carboxyphenylglycine (100 microM), a group I/II mGluR antagonist, the tACPD-induced enhancement of LVA current was blocked. The voltage dependence of the activation or inactivation kinetics was unchanged in the presence of tACPD. Inclusion in the pipette solution of GDP-beta-S (1 mM) blocked the enhancement of the LVA current by APDC, whereas GTP-gamma-S (0.5 mM) prevented recovery of the enhancement. The tACPD-mediated enhancement of the LVA current was still present in cells pretreated with pertussis or cholera toxins (500 ng x ml(-1)). Genistein (10 microM) prevented the enhancement of the LVA current. These results suggest that LVA current can be enhanced by activation of mGluR2, by a mechanism that is G-protein dependent and may involve a protein tyrosine kinase step." @default.
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- W2159887029 date "2003-07-01" @default.
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- W2159887029 title "Enhancement of low-voltage-activated calcium currents by group II metabotropic glutamate receptors in rat retinal ganglion cells" @default.
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- W2159887029 doi "https://doi.org/10.1016/s1044-7431(03)00056-3" @default.
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