Bisphenol chemicals are commonly used in the manufacturing of polycarbonate plastics, polyvinyl chloride plastics, resins, and thermal printing applications. Humans are inadvertently exposed to bisphenols through contact with consumer products and/or medical devices. Recent reports have shown a link between bisphenol-a (BPA) exposure and adverse cardiovascular outcomes; although these studies have been limited to adult subjects and models. Since cardiac physiology differs significantly between the developing and adult heart, we aimed to assess the impact of BPA exposure on cardiac function, using a neonatal cardiomyocyte model. Neonatal rat ventricular myocytes were monitored to assess cell viability, spontaneous beating rate, beat rate variability, and calcium-handling parameters in the presence of control or bisphenol-supplemented media. A range of doses were tested to mimic environmental exposure (10-10M), maximum clinical exposure (10M), and supraphysiological exposure levels (10M). Acute BPA exposure altered cardiomyocyte functionality, resulting in a slowed spontaneous beating rate and increased beat rate variability. BPA exposure also impaired intracellular calcium handling, resulting in diminished calcium transient amplitudes, prolonged calcium transient upstroke and duration time. Alterations in calcium handling also increased the propensity for alternans and skipped beats. Notably, the effect of BPA-treatment on calcium handling was partially reversible. Our data suggest that acute BPA exposure could precipitate secondary adverse effects on contractile performance and/or electrical alternans, both of which are dependent on intracellular calcium homeostasis.
De précédentes études épidémiologiques et expérimentales ont montré que l'exposition au BPA chez les adultes est corrélée au risque d’événements cardiovasculaires indésirables, allant de l’arythmie et de la fibrillation à l’angine de poitrine, la douleur thoracique, la coronar...
A new study paves the way for translational research examining cardiovascular disease risk factors associated with short-term BPA exposure in infancy. By examining neonatal rat heart cells, researchers find the immature heart may respond to BPA with a slowed heart rate, irregu...
More than 8 million pounds of bisphenol A (BPA) is produced each year and reaches 90 percent of the population through consumer and medical products. Epidemiological studies find BPA exposure in adults correlate with adverse cardiovascular events, ranging from abnormal heart b...
May 14, 2018
Credit: Children's National Health System
Study explores impact endocrine disruptors have on cardiovascular function, recommends investigating alternative biomaterials for medical device products used in hospital settings WASHINGTON - (May 14,