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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1995 Aug 29;92(18):8120–8124. doi: 10.1073/pnas.92.18.8120

Thermosensitive phenotype of transgenic mice overproducing human glutathione peroxidases.

O Mirochnitchenko 1, U Palnitkar 1, M Philbert 1, M Inouye 1
PMCID: PMC41107  PMID: 7667255

Abstract

Exposure of humans and other mammals to hyperthermic conditions elicits many physiological responses to stress in various tissues leading to profound injuries, which eventually result in death. It has been suggested that hyperthermia may increase oxidative stress in tissues to form reactive oxygen species harmful to cellular functions. By using transgenic mice with human antioxidant genes, we demonstrate that the overproduction of glutathione peroxidase (GP, both extracellular and intracellular) leads to a thermosensitive phenotype, whereas the overproduction of Cu,Zn-superoxide dismutase has no effect on the thermosensitivity of transgenic mice. Induction of HSP70 in brain, lung, and muscle in GP transgenic mice at elevated temperature was significantly inhibited in comparison to normal animals. Measurement of peroxide production in regions normally displaying induction of HSP70 under hyperthermia revealed high levels of peroxides in normal mice and low levels in GP transgenic mice. There was also a significant difference between normal and intracellular GP transgenic mice in level of prostaglandin E2 in hypothalamus and cerebellum. These data suggest direct participation of peroxides in induction of cytoprotective proteins (HSP70) and cellular mechanisms regulating body temperature. GP transgenic mice provide a model for studying thermoregulation and processes involving actions of hydroxy and lipid peroxides in mammals.

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