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 (DeltaF/F0) and 2.75 +/- 0.17 cycles/min to 0.02 +/- 0.01 (DeltaF/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 (DeltaF/F0) and 2.27 +/- 0.18 cycles/min to 0.43 +/- 0.03 (DeltaF/F0) and 2.87 +/- 0.07 cycles/min. 2-Aminoethoxydiphenyl borane (2-APB), an IP(3) 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 IP(3)-induced calcium release signaling pathway.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s00232-010-9248-3 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Evaluation of a Miniature, Injectable, Wireless Stimulator to Treat Obstructive Sleep Apnea.
Neuromodulation
December 2024
StimAire Corporation, Tucson, AZ, USA.
Introduction: Moderate-to-severe obstructive sleep apnea (OSA) affects a large segment of the US population and is characterized by repetitive and reversible obstruction of the upper airway during sleep. Untreated OSA is associated with increased incidence of heart attack, stroke, and motor vehicle accidents due to sleepiness. Continuous positive airway pressure is often prescribed, but most patients with OSA are nonadherent.
View Article and Find Full Text PDFVasovagal Syncope: A Review of Current and Emerging Therapies for a Common Cardiology Condition.
J Tehran Heart Cent
January 2024
Department of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
Vasovagal syncope (VVS), characterized by transient loss of consciousness, is among the most prevalent reasons for emergency visits worldwide. Although benign in nature, VVS can be accompanied by traumatic injury, leading to morbidity and decreased quality of life, especially in those with VVS recurrence. The management includes non-pharmacologic and pharmacologic therapies (if resistant), patient education and reassurance, salt and fluid intake increase, and physical counter-pressure maneuvers.
View Article and Find Full Text PDFRates of post procedural prophylactic antibiotic use following cardiac implantable electronic device insertion and the impact on surgical site infections in Alberta, Canada.
Antimicrob Resist Infect Control
December 2024
Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada.
Background: The necessity of post procedural prophylactic antibiotics following clean surgeries is controversial. While most evidence suggests that there is no benefit from these additional antibiotics and guidelines do not support their use, there is a paucity of evidence as to how often they are still being used and their impact on infection outcomes. The current study assessed the use of prophylactic antibiotics following cardiac implantable electronic device (CIED) implantations in the province of Alberta, and their impact on infection and mortality.
View Article and Find Full Text PDFMelatonin as a Chronobiotic and Cytoprotector in Non-communicable Diseases: More than an Antioxidant.
Subcell Biochem
December 2024
Centre for Addiction and Mental Health, Department of Psychiatry, University of Toronto, Toronto, ON, Canada.
A circadian disruption, manifested by disturbed sleep and low-grade inflammation, is commonly seen in noncommunicable diseases (NCDs). Cardiovascular, respiratory and renal disorders, diabetes and the metabolic syndrome, cancer, and neurodegenerative diseases are among the most common NCDs prevalent in today's 24-h/7 days Society. The decline in plasma melatonin, which is a conserved phylogenetic molecule across all known aerobic creatures, is a constant feature in NCDs.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!