The E-selectin,P-selectin and ICAM-1 expression at different time points after focal brain ischemic-reperfusion in rats / 中国药理学通报

ABSTRACT

Aim To study the expression of P-selectin,E-selectin and ICAM-1 and the migration of leukocyte at different time points after focal brain ischemia-reperfusion,and explore the role of cell adhesion molecules in cerebral ischemia-reperfusion damage.Methods The model of focal cerebral ischemia-reperfusion was established with the occluding suture as described by Longa.Sham operation was performed without inserting the suture.Rats were decapitated under anesthesia at 4,8,12,24,and 48 h after ischemia-reperfusion.Brains were immediately removed and samples were handled for following application.Morphological changes of the brain tissue were observed through hematoxylin-eosin staining.The positive expressions of P-selectin,E-selectin,and ICAM-1 were observed and located using immunohistochemistry and immunofluorescent histochemistry technique,respectively.The expressions of P-selectin, E-selectin and ICAM-1 in infracted cortex were measured quantitively with Flow cytometry.The activities of myeloperoxidase in the infracted hemispheres represented the migration of leukocytes were detected through biochemical method.Results The positive cells of P-selectin,E-selectin,and ICAM-1 expressed at the same position of microvessels in the infracted hemisphere were significantly increased after ischemia-reperfusion.Compared with the sham operation group(P-selectin(4.99?0.08) channel,E-selectin(4.17?0.13) channel,ICAM-1(4.17?0.13) channel),the expressions of P-selectin,E-selectin,and ICAM-1 at I/R 4 h((5.46?0.09) channel,(4.60?0.14) channel,(4.56?0.12) channel),I/R 8 h((5.87?0.24) channel,(5.08?0.14) channel,(5.41?0.22) channel),I/R 12 h((6.48?0.18) channel,(5.72?0.18) channel,(5.66?0.16) channel),I/R 24 h((7.16?0.11) channel,(6.09?0.09) channel,(5.61?0.09) channel), and I/R 48 h((5.82?0.28) channel,(5.37?0.25) channel,(5.27?0.16) channel) were increased(P