title: The class B scavenger receptor CD36 mediates free radical production and tissue injury in cerebral ischemia.
abstract: The class B scavenger receptor CD36 is involved in the cytotoxicity associated with inflammation, but its role in the inflammatory reaction that accompanies cerebral ischemia has not been examined. In this study, we investigated whether CD36 contributes to the brain damage produced by cerebral ischemia. The middle cerebral artery was transiently occluded in wild-type mice and in mice deficient in CD36. In wild-type mice, CD36 protein expression was increased in the ischemic brain, such that it was located predominantly in cells expressing the microglia/macrophage marker CD11b. The infarct produced by middle cerebral artery occlusion was 49% smaller in CD36-null mice than in wild-type controls, an effect associated with improved neurological function. The attenuation in brain injury in CD36 nulls could not be attributed to differences in cerebral blood flow during ischemia-reperfusion. However, the increase in reactive oxygen species (ROS) produced by cerebral ischemia was markedly attenuated in CD36-null mice in the early stage after reperfusion. The data unveil a previously unrecognized role of CD36 in ischemia-induced ROS production and brain injury. Modulation of CD36 signaling may provide a new strategy for the treatment of ischemic stroke.
authors.affiliation: Division of Neurobiology, Weill Medical College of Cornell University, New York, New York 10021, USA.
authors.forename: Sunghee
authors.initials: S
authors.lastname: Cho
authors.forename: Eun-Mi
authors.initials: EM
authors.lastname: Park
authors.forename: Maria
authors.initials: M
authors.lastname: Febbraio
authors.forename: Josef
authors.initials: J
authors.lastname: Anrather
authors.forename: Laibaik
authors.initials: L
authors.lastname: Park
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Racchumi
authors.forename: Roy L
authors.initials: RL
authors.lastname: Silverstein
authors.forename: Costantino
authors.initials: C
authors.lastname: Iadecola
mesh_terms: D000818:Animals; D002545:Brain Ischemia / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D018955:CD36 Antigens / Q000096:biosynthesis* / Q000235:genetics; D005609:Free Radicals / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D017382:Reactive Oxygen Species / Q000378:metabolism; D015427:Reperfusion Injury / Q000235:genetics / Q000378:metabolism* / Q000473:pathology
chemical_list: D018955:CD36 Antigens; D005609:Free Radicals; D017382:Reactive Oxygen Species