Research output: Contribution to journal › Article › peer-review
Влияние ионного состава внешней среды на блокаду ионных каналов АМРА рецепторов. / Tikhonova, T. B.; Magazanik, L. G.; Tikhonov, D. B.
In: Rossiǐskii fiziologicheskiǐ zhurnal imeni I.M. Sechenova / Rossiǐskaia akademiia nauk, Vol. 96, No. 3, 03.2010, p. 237-246.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Влияние ионного состава внешней среды на блокаду ионных каналов АМРА рецепторов.
AU - Tikhonova, T. B.
AU - Magazanik, L. G.
AU - Tikhonov, D. B.
PY - 2010/3
Y1 - 2010/3
N2 - It is well known that ion composition significantly affects action of various pharmacological agents. In the present work we studied influence of external sodium on the block of Ca2+ -permeable AMPA receptor channels by dicationic derivative of phenylcyclohexyl IEM-1925. Experiments were performed on native receptors of giant striatal interneurones isolated from the rat brain slices. Registrations were done with the aid of whole-cell patch clamp technique. We found that partial substitution of external sodium by sucrose potentiated the blocking action of IEM-1925. The effect was voltage-dependent, being more pronounced at hyperpolarized voltages. The analysis of kinetics of the IEM-1925 action demonstrated that lowering of external sodium facilitated blocking action, whereas stability of the drug-channel complex remained unaffected. We conclude that the current carrying sodium ions compete with blocking cation IEM-1925 for an intrapore binding site.
AB - It is well known that ion composition significantly affects action of various pharmacological agents. In the present work we studied influence of external sodium on the block of Ca2+ -permeable AMPA receptor channels by dicationic derivative of phenylcyclohexyl IEM-1925. Experiments were performed on native receptors of giant striatal interneurones isolated from the rat brain slices. Registrations were done with the aid of whole-cell patch clamp technique. We found that partial substitution of external sodium by sucrose potentiated the blocking action of IEM-1925. The effect was voltage-dependent, being more pronounced at hyperpolarized voltages. The analysis of kinetics of the IEM-1925 action demonstrated that lowering of external sodium facilitated blocking action, whereas stability of the drug-channel complex remained unaffected. We conclude that the current carrying sodium ions compete with blocking cation IEM-1925 for an intrapore binding site.
UR - http://www.scopus.com/inward/record.url?scp=77954724474&partnerID=8YFLogxK
M3 - статья
C2 - 20535994
AN - SCOPUS:77954724474
VL - 96
SP - 237
EP - 246
JO - РОССИЙСКИЙ ФИЗИОЛОГИЧЕСКИЙ ЖУРНАЛ ИМ. И.М. СЕЧЕНОВА
JF - РОССИЙСКИЙ ФИЗИОЛОГИЧЕСКИЙ ЖУРНАЛ ИМ. И.М. СЕЧЕНОВА
SN - 0869-8139
IS - 3
ER -
ID: 99384706