Actin Microfilament Involved in Regulation of Pacemaking Activity in Cultured Interstitial Cells of Cajal from Murine Intestine

Actin Microfilament Involved in Regulation of Pacemaking Activity in Cultured Interstitial Cells... The present study investigated the effect of actin microfilament structure on pacemaker currents and calcium oscillation in cultured murine intestinal interstitial cells of Cajal (ICCs) by whole-cell patch-clamp technique and calcium imaging technique. Cytochalasin B, a disruptor of actin microfilaments, decreased the amplitude and frequency of pacemaker currents from 491.32 ± 160.33 pA and 11.73 ± 0.79 cycles/min to 233.12 ± 92.00 pA and 10.29 ± 0.76 cycles/min. Cytochalasin B also decreased the amplitude and frequency of calcium oscillation from 0.32 ± 0.08 (ΔF/F0) and 2.75 ± 0.17 cycles/min to 0.02 ± 0.01 (ΔF/F0) and 1.20 ± 0.08 cycles/min. Phalloidin, a stabilizer of actin microfilaments, increased the amplitude and frequency of pacemaker currents from 751.79 ± 282.82 pA and 13.93 ± 1.00 cycles/min to 1234.34 ± 607.83 pA and 14.68 ± 1.00 cycles/min. Phalloidin also increased the amplitude and frequency of calcium oscillation from 0.26 ± 0.01 (ΔF/F0) and 2.27 ± 0.18 cycles/min to 0.43 ± 0.03 (ΔF/F0) and 2.87 ± 0.07 cycles/min. 2-Aminoethoxydiphenyl borane (2-APB), an IP3 receptor blocker, suppressed both pacemaker currents and calcium oscillations. 2-APB also blocked the phalloidin-induced increase in pacemaker currents and calcium oscillation. Ryanodine, an inhibitor of calcium-induced calcium release, did not affect pacemaker current but suppressed calcium oscillations. Ryanodine had no effect on altering phalloidin-induced increases in pacemaker current and calcium oscillation. These results suggest that actin microfilaments regulate pacemaker activity via the IP3-induced calcium release signaling pathway. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Actin Microfilament Involved in Regulation of Pacemaking Activity in Cultured Interstitial Cells of Cajal from Murine Intestine

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Publisher
Springer-Verlag
Copyright
Copyright © 2010 by Springer Science+Business Media, LLC
Subject
Life Sciences; Human Physiology ; Biochemistry, general
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s00232-010-9248-3
Publisher site
See Article on Publisher Site

Abstract

The present study investigated the effect of actin microfilament structure on pacemaker currents and calcium oscillation in cultured murine intestinal interstitial cells of Cajal (ICCs) by whole-cell patch-clamp technique and calcium imaging technique. Cytochalasin B, a disruptor of actin microfilaments, decreased the amplitude and frequency of pacemaker currents from 491.32 ± 160.33 pA and 11.73 ± 0.79 cycles/min to 233.12 ± 92.00 pA and 10.29 ± 0.76 cycles/min. Cytochalasin B also decreased the amplitude and frequency of calcium oscillation from 0.32 ± 0.08 (ΔF/F0) and 2.75 ± 0.17 cycles/min to 0.02 ± 0.01 (ΔF/F0) and 1.20 ± 0.08 cycles/min. Phalloidin, a stabilizer of actin microfilaments, increased the amplitude and frequency of pacemaker currents from 751.79 ± 282.82 pA and 13.93 ± 1.00 cycles/min to 1234.34 ± 607.83 pA and 14.68 ± 1.00 cycles/min. Phalloidin also increased the amplitude and frequency of calcium oscillation from 0.26 ± 0.01 (ΔF/F0) and 2.27 ± 0.18 cycles/min to 0.43 ± 0.03 (ΔF/F0) and 2.87 ± 0.07 cycles/min. 2-Aminoethoxydiphenyl borane (2-APB), an IP3 receptor blocker, suppressed both pacemaker currents and calcium oscillations. 2-APB also blocked the phalloidin-induced increase in pacemaker currents and calcium oscillation. Ryanodine, an inhibitor of calcium-induced calcium release, did not affect pacemaker current but suppressed calcium oscillations. Ryanodine had no effect on altering phalloidin-induced increases in pacemaker current and calcium oscillation. These results suggest that actin microfilaments regulate pacemaker activity via the IP3-induced calcium release signaling pathway.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Mar 27, 2010

References

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