title: Neuroprotection by inhaled nitric oxide in a murine stroke model is concentration and duration dependent.
abstract: Inhaled nitric oxide (iNO) has been shown to reduce ischemia/reperfusion (I/R) injury in several different organ systems including the brain. We investigated whether iNO was neuroprotective in a mouse model of transient focal ischemia. Male Swiss Webster mice underwent middle cerebral artery occlusion for 1 h followed by reperfusion for 47 h. Mice were divided into 5 concentration groups and administered nitric oxide (NO) at either 10, 20, 40, 60 or 80 ppm. Each of the 5 concentration groups was subdivided into 4 duration groups which were treated with iNO for 5, 8, 16 or 24 h beginning immediately after artery occlusion. Results showed both concentration and duration determined efficacy. At 10 ppm only the 24hr duration group exhibited reduced infarct volume while at 20, 40 and 60 ppm only 8 and 16 h of exposure led to smaller infarctions. At these concentrations the dose response curves were strongly U shaped indicating a loss of benefit at long durations. At 80 ppm, reduction in infarct volume was not observed at any duration. Additional experiments showed that 60 ppm iNO could be transported from lung to brain and that iNO administered for 8h improved recovery from subarachnoid hemorrhage and reduced the inflammatory response accompanying ischemic stroke. Enhanced blood flow during reperfusion may be an important mediator of these effects.
authors.affiliation: Department of Neurology, New York University School of Medicine, 550 1st Avenue New York, NY 10016, USA.
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Li
authors.forename: Benjamin
authors.initials: B
authors.lastname: Shemmer
authors.forename: Eric
authors.initials: E
authors.lastname: Stone
authors.forename: Michael
authors.initials: M
authors.lastname: A Nardi
authors.forename: Saran
authors.initials: S
authors.lastname: Jonas
authors.forename: David
authors.initials: D
authors.lastname: Quartermain
mesh_terms: D000280:Administration, Inhalation; D000818:Animals; D001921:Brain / Q000098:blood supply / Q000187:drug effects*; D004195:Disease Models, Animal; D020244:Infarction, Middle Cerebral Artery / Q000188:drug therapy; D008297:Male; D051379:Mice; D018696:Neuroprotective Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D009569:Nitric Oxide / Q000008:administration & dosage* / Q000627:therapeutic use; D015427:Reperfusion Injury / Q000188:drug therapy; D020521:Stroke / Q000188:drug therapy*
chemical_list: D018696:Neuroprotective Agents; D009569:Nitric Oxide