Cardiac toxicity from bisphenol A exposure in human-induced pluripotent stem cell-derived cardiomyocytes.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study on cell culture with no human clinical subjects
PubMed 34419494 · doi:10.1016/j.taap.2021.115696
What was done
The authors investigated the acute electrophysiological and contractile effects of bisphenol A (BPA) exposure in human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs). They measured cardiac field potentials using a multielectrode array (MEA) and assessed specific cardiac ion channel currents (I_Ca, I_Na, and I_Kr), intracellular calcium transients, and cardiomyocyte contraction.
What was found
Acute BPA exposure reduced cardiac field potential in hiPSC-CMs. BPA exposure dose-dependently inhibited I_Ca, I_Na, and I_Kr ion currents. Additionally, BPA dose-dependently suppressed intracellular calcium transients and cellular contraction. No specific numerical values, concentrations, or effect sizes were reported in the abstract.
Why it matters
This study provides in vitro mechanistic evidence that BPA directly impairs human cardiomyocyte electrophysiology and contraction, identifying potential pathways linking environmental BPA exposure to arrhythmias and cardiac dysfunction.
Limits
The study is an in vitro bench model using stem cell-derived cardiomyocytes, which may not fully recapitulate mature adult human myocardium or in vivo pharmacokinetics. The abstract does not report specific tested concentrations, sample sizes (n), or statistical effect estimates, precluding assessment of whether effects occur at physiologically relevant human exposure levels.
Cited by
- supports Acute exposure to BPA inhibits voltage-gated calcium channels in cardiomyocytes, impairing calcium handling and heart contractions.