Role of Oxidative Stress in Mediating Elevated Atrial Fibrillation by Tumor Necrosis Factor-Alpha
Year: 2012
Type: dissertation
Abstract: Atrial fibrillation (AF), the most common arrhythmia encountered in clinical practice, is a major source of morbidity and mortality, and is highly associated with inflammation and oxidative stress. In the present study, we show that acute exposure of mice atrial tissue to tumor necrosis factor-α (TNF-α) increases susceptibility to AF. We further show that acute exposure to TNF-α led to increased spontaneous sarcoplasmic reticulum (SR) calcium release and generated triggered activities in isolated mice atrial myocytes. This increase in spontaneous SR calcium activity was found to be due to elevated reactive oxygen species production from mitochondria and NADPH oxidase sources triggered by TNF-α. Hence we concluded that acute exposure to TNF-α leads to elevated oxidative stress that increases spontaneous SR Ca2+ release and triggered activity through which it can lead to AF induction and maintenance
Source: TSpace (University of Toronto)
Author: S. Moniba Mirkhani
Language: English
Subfield: Cardiology and Cardiovascular Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W1961931492