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- W2062206844 abstract "Toward our goal to better understand the physiological parameters that mediate olfactory information processing on the cellular level, voltage-activated calcium currents ( I Ca ) in olfactory interneurons of the antennal lobe from adult cockroaches were analyzed under two conditions: 1) in acutely dissociated cells (in vitro) and 2) in an intact brain preparation (in situ). The study included an analysis of modulatory effects of potential inorganic and organic Ca 2+ channel blockers. I Ca was isolated and identified using pharmacological, voltage, and ion substitution protocols. I Ca consisted of two components: transient and sustained. The decay of the transient component was largely Ca 2+ dependent. In vitro, I Ca had an activation threshold of −50 mV with a maximal peak current at −7 mV and a half-maximal voltage ( V 0.5act ) for tail-current activation of −18 mV. In situ these parameters were significantly shifted to more depolarized membrane potentials: I Ca activated at −40 mV with a maximal peak current at 8 mV and a V 0.5act for tail-current activation of −11 mV. The sensitivity of I Ca to the divalent cations Cd 2+ , Co 2+ , and Ni 2+ was dose dependent. The most effective blocker was Cd 2+ with an IC 50 of 10 −5 M followed by Ni 2+ (IC 50 = 3.13 × 10 −3 M) and Co 2+ (IC 50 = 1.06 × 10 −3 M). The organic channel blockers verapamil, diltiazem, and nifedipine also blocked I Ca in a dose-dependent way and had differential effects on the current waveform. Verapamil blocked I Ca with an IC 50 of 1.5 × 10 −4 M and diltiazem had an IC 50 of 2.87 × 10 −4 M. Nifedipine blocked I Ca by 33% at a concentration of 10 −4 M." @default.
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- W2062206844 date "2008-01-01" @default.
- W2062206844 modified "2023-10-18" @default.
- W2062206844 title "Functional Parameters of Voltage-Activated Ca<sup>2+</sup>Currents From Olfactory Interneurons in the Antennal Lobe of<i>Periplaneta americana</i>" @default.
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- W2062206844 doi "https://doi.org/10.1152/jn.00719.2007" @default.
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