title: The expression of P- and E-selectins in three models of middle cerebral artery occlusion.
abstract: The expression and localization of P- and E-selectins in rat brain (n=126) were examined using immunohistochemical techniques at various time points after induction of middle cerebral artery (MCA) occlusion in the suture, thrombotic and embolic models of stroke. Expression of P- or E-selectin was not observed in brain tissue of sham operated control rats (n=9). P-selectin immunoreactivity was detected as early as 15 min and decreased to control level at 1 h after the onset of the MCA occlusion in all three models. P-selectin then slightly increased at 2 h and peaked at 6 h after MCA occlusion. E-selectin immunoreactivity was first observed at 2 h and peaked at 6 h and 12 h of after MCA occlusion in all three models. P- and E-selectin immunoreactivity was colocalized with von Willebrand factor immunoreactive microvessels. 90.4+/-2.0% of all vessels expressing P-selectin immunoreactivity were 7.5 to 30.0 micron in diameter; 3.6+/-1.4% were contained in vessels smaller than 7.5 micron, and 6.0+/-1.8% were localized in vessels greater than 30.0 micron in diameter. The percent distribution of E-selectin immunoreactive vessels were 75.9+/-2.1% in vessels 7.5 to 30.0 micron in diameter; 23.6+/-2.2% were in vessels smaller than 7.5 micron, and 0.6+/-0.4% were localized in vessels greater than 30.0 micron in diameter. These findings indicate that the temporal profiles of P- and E-selectin expression are independent of these models of MCA occlusion and are consistent with the time course of selectin mediated leukocyte infiltration after focal cerebral ischemia in the rat.
authors.affiliation: Henry Ford Health Sciences Center, Neurology Department, Detroit, MI 48202, USA.
authors.forename: R
authors.initials: R
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Chopp
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
authors.forename: N
authors.initials: N
authors.lastname: Jiang
authors.forename: C
authors.initials: C
authors.lastname: Powers
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001921:Brain / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology*; D002536:Cerebral Arteries; D019040:E-Selectin / Q000096:biosynthesis; D007839:Functional Laterality; D002542:Intracranial Embolism and Thrombosis / Q000473:pathology / Q000503:physiopathology*; D002546:Ischemic Attack, Transient / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D019007:P-Selectin / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D012016:Reference Values; D013997:Time Factors
chemical_list: D019040:E-Selectin; D019007:P-Selectin