title: Hyperbaric O2 reduces intestinal ischemia-reperfusion-induced TNF-alpha production and lung neutrophil sequestration.
abstract: Treatment with hyperbaric O2 (HBO) ameliorates ischemia-reperfusion (I/R) injury. Since tumor necrosis factor-alpha (TNF-alpha) plays an important role in I/R injury, we hypothesized that the effect of HBO in I/R injury may be due to its ability to inhibit TNF-alpha production. In this study, one group of rats received HBO during 60 min of ischemia (HBO group, n = 9), while control rats endured the same procedure but did not receive HBO (non-HBO, n = 9). A group of sham-operated control rats (SHAM, n = 6) underwent laparotomy without occlusion of the artery and HBO treatment. Intestinal I/R led to an increase in serum TNF-alpha concentration to [mean (SEM)] 165 (32) pg/ml (P < 0.01 vs SHAM rats). HBO attenuated this increase [34 (9) pg/ml; P<0.05 vs non-HBO group]. Intestinal I/R also resulted in a marked increase in lung myeloperoxidase content [0.62 (0.04) U/g vs 0.17 (0.02) U/g of SHAM rats, P<0.01]. HBO suppressed this increase [0.40 (0.04) U/g, P<0.05 vs non-HBO rats]. HBO ameliorated the injury to the intestine and lung. The number of neutrophils sequestered in the lung was reduced in HBO rats compared to non-HBO rats [6.4 (0.9) neutrophils/per oil field and 10.9 (2) neutrophils/per oil field, respectively; P < 0.05]. These findings demonstrate that HBO inhibits TNF-alpha production during intestinal I/R, and this reduced TNF-alpha production may be attributed to the beneficial effects of HBO.
authors.affiliation: Department of Anesthesiology, New York Upstate Medical Center, State University of New York, Syracuse 13210, USA. yangz@upstate.edu
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Yang
authors.forename: G
authors.initials: G
authors.lastname: Bosco
authors.forename: A
authors.initials: A
authors.lastname: Montante
authors.forename: X I
authors.initials: XI
authors.lastname: Ou
authors.forename: E M
authors.initials: EM
authors.lastname: Camporesi
mesh_terms: D000208:Acute Disease; D000818:Animals; D006931:Hyperbaric Oxygenation; D007422:Intestines / Q000098:blood supply / Q000276:immunology / Q000473:pathology; D008168:Lung / Q000166:cytology / Q000276:immunology*; D008297:Male; D008871:Microvilli / Q000473:pathology; D009504:Neutrophils / Q000201:enzymology / Q000276:immunology*; D009195:Peroxidase / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000276:immunology / Q000628:therapy*; D013047:Specific Pathogen-Free Organisms; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000378:metabolism
chemical_list: D014409:Tumor Necrosis Factor-alpha; D009195:Peroxidase