期刊
ARCHIVES OF TOXICOLOGY
卷 90, 期 5, 页码 1181-1191出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00204-015-1537-2
关键词
Liver on chip; Acetaminophen; Amiodarone; Mitochondria; Oxygen uptake; Bioreactor
类别
资金
- ERC TMIHCV [242699]
- British Council BIRAX [33BX12HGYN]
- HeMibio consortium by European Commission
- Cosmetics Europe as part of the SEURAT-1 cluster [HEALTH-F5-2010-266777]
- ILB project FeLas3D [80149436]
- European Research Council (ERC) [242699] Funding Source: European Research Council (ERC)
Prediction of drug-induced toxicity is complicated by the failure of animal models to extrapolate human response, especially during assessment of repeated dose toxicity for cosmetic or chronic drug treatments. In this work, we present a 3D microreactor capable of maintaining metabolically active HepG2/C3A spheroids for over 28 days in vitro under stable oxygen gradients mimicking the in vivo microenvironment. Mitochondrial respiration was monitored using two-frequency phase modulation of phosphorescent microprobes embedded in the tissue. Phase modulation is focus independent and unaffected by cell death or migration. This sensitive measurement of oxygen dynamics revealed important information on the drug mechanism of action and transient subthreshold effects. Specifically, exposure to antiarrhythmic agent, amiodarone, showed that both respiration and the time to onset of mitochondrial damage were dose dependent showing a TC50 of 425 mu m. Analysis showed significant induction of both phospholipidosis and microvesicular steatosis during long-term exposure. Importantly, exposure to widely used analgesic, acetaminophen, caused an immediate, reversible, dose-dependent loss of oxygen uptake followed by a slow, irreversible, dose-independent death, with a TC50 of 12.3 mM. Transient loss of mitochondrial respiration was also detected below the threshold of acetaminophen toxicity. The phenomenon was repeated in HeLa cells that lack CYP2E1 and 3A4, and was blocked by preincubation with ascorbate and TMPD. These results mark the importance of tracing toxicity effects over time, suggesting a NAPQI-independent targeting of mitochondrial complex III might be responsible for acetaminophen toxicity in extrahepatic tissues.
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