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- W2026656372 abstract "It has been shown that multiple exposures of gravid rats to cocaine during late gestation result in significant incidences of severe malformations. Hind limb reduction defects were frequent findings in this study. Other studies have shown that comparable abnormalities can be induced in experimental animals by various procedures including vascular clamping, direct fetal exposure to epinephrine, uterine handling following laparotomy, as well as by exposure to hyperbaric oxygen. This paper reviews these and other studies, and presents a novel mechanistic hypothesis that explains their common findings. It is proposed that in each instance, conceptual hypoxia results from hypoperfusion caused by transient vasoconstriction. Following the resumption of normal perfusion, reactive oxygen species are generated by the ischemia/reperfusion mechanisms thought to underlie many pathobiologic lesions. It is proposed that the conceptus is particularly vulnerable to the toxicity of oxygen radicals because of its low antioxidant activities and the highly reduced state of its undifferentiated cells. Sensitivity to cocaine and uterine handling appears to be enhanced during late gestation and it is hypothesized that this results from changes in oxygenation and iron content that increase both the substrate and catalyst for generation of reactive oxygen species." @default.
- W2026656372 created "2016-06-24" @default.
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- W2026656372 date "1992-09-01" @default.
- W2026656372 modified "2023-10-07" @default.
- W2026656372 title "Ischemia/reperfusion: A new hypothesis for the developmental toxicity of cocaine" @default.
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- W2026656372 doi "https://doi.org/10.1002/tera.1420460313" @default.
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