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• W2044184003 abstract "Effects of seven, pressure applied MIP (Mytilus inhibitory peptides) had been studied on D-neurons of the CNS of Helix pomatia in voltage-clamp experiments. In physiological saline, the peptides produced a hyperpolarization usually coupled with the cessation of any spontaneous spiking activity. Clamped at the resting potential ( approximately -60 mV), peptide applications elicited an outward current, which increased its amplitude by shifting the holding potential towards depolarisation. The response was concentration-dependent and accompanied by an increased membrane conductance. Reversal potentials obtained at different [K+]o were plotted with a slope of 52 mV per ten-fold change in [K+]o showing that the peptide-elicited current was mainly due to the increased K+-conductance(s). The peptide-induced outward current could partially be blocked by Ba2+ (5 mM), CdCl2 (1 mM), TEACl (10 mM) or apamin (2.5x10(-5) M) or furosemide (10 mg/ml) and decreased either in Na+-free or Cl--free solutions. 4-Aminopyridine at 5 mM concentration completely blocked the peptide-induced current. In the presence of high [K+]o, the peptide(s) was still found to induce an outward current at membrane potentials beyond K+-reversal potential. This component was not present in Cl--free saline, suggesting that the current was due to the inward flow of Cl- ions. Our results show that the MIPs have at least two (three) independent actions, each associated with different voltage-, concentration-dependence and ionic mechanisms. It is suggested, that the peptide-induced currents are carried by K+, and Cl- ions. According to our present finding, the observed effects are mediated by the same receptor, activating different second messenger systems, inducing multiple conductance changes in the membrane of neurons of the snail ganglia." @default.
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• W2044184003 date "1999-06-01" @default.
• W2044184003 modified "2023-10-05" @default.
• W2044184003 title "Ionic mechanism mediating Mytilus inhibitory peptides elicited membrane currents in identified Helix neurons" @default.
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• W2044184003 doi "https://doi.org/10.1016/s0006-8993(99)01398-0" @default.
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