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Role of Ca 2+ Transporters and Channels in the Cardiac Cell Volume Regulation
Author(s) -
TAKEUCHI A.,
TATSUMI S.,
SARAI N.,
TERASHIMA K.,
MATSUOKA S.,
NOMA A.
Publication year - 2007
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1387.020
Subject(s) - ouabain , depolarization , chemistry , membrane potential , transporter , biophysics , cell , myocyte , volume (thermodynamics) , ion transporter , guinea pig , cell membrane , membrane , cardiac cell , sodium , medicine , biochemistry , biology , physics , organic chemistry , quantum mechanics , gene
Na + /K + pump is one of key mechanisms to maintain cell volume. When it is inhibited, cells are at risk of swelling. However, in guinea pig ventricular myocytes, the cell area as an index of cell volume was almost constant during 90 min Na + /K + pump blockade with 40 μM ouabain despite the marked membrane depolarization. In this study, involvements of Ca 2+ transporters and channels in the cardiac cell volume regulation were proposed by conducting the computer simulation in parallel with the experimental validation.