Effects of hyperbaric oxygen on the expression of MMP-9 and MMP-2 mRNA in the brain tissues and on the permeability of the blood brain barrier after cerebral ischemia and reperfusion / 中华物理医学与康复杂志

ABSTRACT

Objective To investigate the effects of hyperbaric oxygen(HBO)on the expression of MMP-9 and MMP-2 mRNA in the brain tissues after cerebral ischemia and reperfusion,and the permeability of blood brain barrier(BBB).Methods Using cerebral ischemia-reperfusion models with conscious mice,0.25 MPa(atmosphaera absolutus,ATA)HBO was applied 5 times during the reperfusion period,and 2%Evan's blue(EB)was injected into the tail vein 1 hour before the animals were sacrificed.The expression of MMP-9 and MMP-2 mRNA and EB content were determined by RT-PCR and spectrophotometry.Results The expression of MMP-9 and MMP-2 mRNA aswell as EB content significantly increased in the ischemia-reperfusion group as compared with a sham surgery group.The expression of MMP-9 and MMP-2 mRNA,and EB levels in the HBO group were similar to those in the sham surgery group.The expression of MMP-9 and MMP-2 mRNA and EB levels in the group given HBO plus reperfusion group were significantly decreased as compared with those in the group receiving reperfusion alone. Conclusion HBO can significandy reduce the expression of MMP-9 and MMP-2 mRNA and the permeability of the BBB.