title: Hydrogen acts as a therapeutic antioxidant by selectively reducing cytotoxic oxygen radicals.
abstract: Acute oxidative stress induced by ischemia-reperfusion or inflammation causes serious damage to tissues, and persistent oxidative stress is accepted as one of the causes of many common diseases including cancer. We show here that hydrogen (H(2)) has potential as an antioxidant in preventive and therapeutic applications. We induced acute oxidative stress in cultured cells by three independent methods. H(2) selectively reduced the hydroxyl radical, the most cytotoxic of reactive oxygen species (ROS), and effectively protected cells; however, H(2) did not react with other ROS, which possess physiological roles. We used an acute rat model in which oxidative stress damage was induced in the brain by focal ischemia and reperfusion. The inhalation of H(2) gas markedly suppressed brain injury by buffering the effects of oxidative stress. Thus H(2) can be used as an effective antioxidant therapy; owing to its ability to rapidly diffuse across membranes, it can reach and react with cytotoxic ROS and thus protect against oxidative damage.
authors.affiliation: Department of Biochemistry and Cell Biology, Institute of Development and Aging Sciences, Graduate School of Medicine, Nippon Medical School, 1-396 Kosugi-cho, Nakahara-ku, Kawasaki City 211-8533, Japan.
authors.forename: Ikuroh
authors.initials: I
authors.lastname: Ohsawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ishikawa
authors.forename: Kumiko
authors.initials: K
authors.lastname: Takahashi
authors.forename: Megumi
authors.initials: M
authors.lastname: Watanabe
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Nishimaki
authors.forename: Kumi
authors.initials: K
authors.lastname: Yamagata
authors.forename: Ken-Ichiro
authors.initials: K
authors.lastname: Katsura
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Katayama
authors.forename: Sadamitsu
authors.initials: S
authors.lastname: Asoh
authors.forename: Shigeo
authors.initials: S
authors.lastname: Ohta
mesh_terms: D000280:Administration, Inhalation; D000818:Animals; D000975:Antioxidants / Q000008:administration & dosage / Q000627:therapeutic use*; D002544:Cerebral Infarction / Q000628:therapy*; D004195:Disease Models, Animal; D006801:Humans; D006859:Hydrogen / Q000008:administration & dosage / Q000627:therapeutic use*; D017665:Hydroxyl Radical / Q000037:antagonists & inhibitors* / Q000378:metabolism / Q000633:toxicity*; D008297:Male; D053078:Membrane Potential, Mitochondrial / Q000502:physiology; D010084:Oxidation-Reduction; D016716:PC12 Cells; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000628:therapy*
chemical_list: D000975:Antioxidants; D017665:Hydroxyl Radical; D006859:Hydrogen