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Oxygen Sensing: Life and Death of a Cell

Oxygen sensing and redox signaling: the role of thioredoxin in embryonic development and cardiac diseases

¹Department of Biological Responses, Institute for Virus Research, Kyoto University, Kyoto, Japan; ²Department of Cardiovascular Medicine, Kishiwada City Hospital, Kishiwada City, Japan; and ³Department of Experimental Therapeutics, Translational Research Center, Kyoto University Hospital, Kyoto, Japan

It is important to regulate the oxygen concentration and scavenge oxygen radicals throughout the life of animals. In mammalian embryos, proper oxygen concentration gradually increases in utero and excessive oxygen is rather toxic during early embryonic development. Reactive oxygen species (ROS) are generated as by-products in the respiratory system and increased under inflammatory conditions. In the pathogenesis of a variety of adult human diseases such as cancer and cardiovascular disorders, ROS cause an enhancement of tissue injuries. ROS promote not only the development of atherosclerosis but also tissue injury during the reperfusion process. The thioredoxin (TRX) system is one of the most important mechanisms for regulating the redox balance. TRX is a small redox active protein distributed ubiquitously in various mammalian tissues and cells. TRX acts as not only an antioxidant but also an anti-inflammatory and an antiapoptotic protein. TRX is induced by oxidative stress and released from cells in response to oxidative stress. In various human diseases, the serum/plasma level of TRX is a well-recognized biomarker of oxidative stress. Here we discuss the roles of TRX on oxygen stress and redox regulation from different perspectives, in embryogenesis and in adult diseases focusing on cardiac disorders.

reactive oxygen species; oxidative stress

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