Abstract
Effects of Zn2+ and other polyvalent cations on glycine-induced currents in the freshly dissociated rat dorsal motor nucleus of the vagus neurons were investigated under voltage-clamp conditions by the use of the nystatin-perforated patch recording configuration. Glycine evoked a Cl- current in a concentration-dependent manner with a half-maximum effective concentration (EC50) of 3.3 x 10-5 M. Strychnine inhibited the 3 x 10- 5 M glycine-induced current in a concentration-dependent manner with a half- maximal inhibitory concentration (IC50) of 6.8 x 10-7 M. At low concentrations (3 x 10-8 M-3 x 10-6 M), Zn2+ potentiated the current elicited by 3 x 10-5 M glycine. On the other hand, at concentrations higher than 10-5 M, Zn2+ inhibited the glycine response. The biphasic action of Zn2+ was mimicked by Ni2+, but La3+ and Co2+ had only potentiating effect. Zn2+ shifted the concentration-response curve for the glycine- induced current without changing the maximum response, and the EC50 values for the glycine response in the absence and presence of 10-6 M and 10-4 M Zn2+ were 3.3 x 10-5 M, 1.3 x 10-5 M and 1.3 x 10-4 M, respectively. These results suggest that the biphasic modulation of glycine response by Zn2+ results from changes in apparent glycine affinity.
| Original language | English |
|---|---|
| Pages (from-to) | 424-430 |
| Number of pages | 7 |
| Journal | Brain Research |
| Volume | 816 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jan 23 1999 |
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All Science Journal Classification (ASJC) codes
- Neuroscience(all)
- Molecular Biology
- Clinical Neurology
- Developmental Biology
Cite this
Modulation of glycine-induced currents by zinc and other metal cations in neurons acutely dissociated from the dorsal motor nucleus of the vagus of the rat. / Doi, Atsushi; Kishimoto, Kiyonori; Ishibashi, Hitoshi.
In: Brain Research, Vol. 816, No. 2, 23.01.1999, p. 424-430.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Modulation of glycine-induced currents by zinc and other metal cations in neurons acutely dissociated from the dorsal motor nucleus of the vagus of the rat
AU - Doi, Atsushi
AU - Kishimoto, Kiyonori
AU - Ishibashi, Hitoshi
PY - 1999/1/23
Y1 - 1999/1/23
N2 - Effects of Zn2+ and other polyvalent cations on glycine-induced currents in the freshly dissociated rat dorsal motor nucleus of the vagus neurons were investigated under voltage-clamp conditions by the use of the nystatin-perforated patch recording configuration. Glycine evoked a Cl- current in a concentration-dependent manner with a half-maximum effective concentration (EC50) of 3.3 x 10-5 M. Strychnine inhibited the 3 x 10- 5 M glycine-induced current in a concentration-dependent manner with a half- maximal inhibitory concentration (IC50) of 6.8 x 10-7 M. At low concentrations (3 x 10-8 M-3 x 10-6 M), Zn2+ potentiated the current elicited by 3 x 10-5 M glycine. On the other hand, at concentrations higher than 10-5 M, Zn2+ inhibited the glycine response. The biphasic action of Zn2+ was mimicked by Ni2+, but La3+ and Co2+ had only potentiating effect. Zn2+ shifted the concentration-response curve for the glycine- induced current without changing the maximum response, and the EC50 values for the glycine response in the absence and presence of 10-6 M and 10-4 M Zn2+ were 3.3 x 10-5 M, 1.3 x 10-5 M and 1.3 x 10-4 M, respectively. These results suggest that the biphasic modulation of glycine response by Zn2+ results from changes in apparent glycine affinity.
AB - Effects of Zn2+ and other polyvalent cations on glycine-induced currents in the freshly dissociated rat dorsal motor nucleus of the vagus neurons were investigated under voltage-clamp conditions by the use of the nystatin-perforated patch recording configuration. Glycine evoked a Cl- current in a concentration-dependent manner with a half-maximum effective concentration (EC50) of 3.3 x 10-5 M. Strychnine inhibited the 3 x 10- 5 M glycine-induced current in a concentration-dependent manner with a half- maximal inhibitory concentration (IC50) of 6.8 x 10-7 M. At low concentrations (3 x 10-8 M-3 x 10-6 M), Zn2+ potentiated the current elicited by 3 x 10-5 M glycine. On the other hand, at concentrations higher than 10-5 M, Zn2+ inhibited the glycine response. The biphasic action of Zn2+ was mimicked by Ni2+, but La3+ and Co2+ had only potentiating effect. Zn2+ shifted the concentration-response curve for the glycine- induced current without changing the maximum response, and the EC50 values for the glycine response in the absence and presence of 10-6 M and 10-4 M Zn2+ were 3.3 x 10-5 M, 1.3 x 10-5 M and 1.3 x 10-4 M, respectively. These results suggest that the biphasic modulation of glycine response by Zn2+ results from changes in apparent glycine affinity.
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UR - http://www.scopus.com/inward/citedby.url?scp=0033596506&partnerID=8YFLogxK
U2 - 10.1016/S0006-8993(98)01172-X
DO - 10.1016/S0006-8993(98)01172-X
M3 - Article
C2 - 9878863
AN - SCOPUS:0033596506
VL - 816
SP - 424
EP - 430
JO - Brain Research
JF - Brain Research
SN - 0006-8993
IS - 2
ER -