ABSTRACT
OBJECTIVE@#To explore the effect of the cerebral thrombin preconditioning on the thrombin-induced brain edema, to detect the expression of tumor necrosis factor-alpha (TNF-alpha), and to analyse the relationship between TNF-alpha and the thrombin-induced brain edema.@*METHODS@#Forty SD rats were randomly divided into a ST group and a TT group. The rats received 50 L saline (ST group) or 1 U thrombin infusion (TT group), and received the second infusion (10 U thrombin) 24 h later. The rats were sacrificed at 24 and 72 h after the second infusion in order to examine the changes of brain water and sodium contents as well as the expression of TNF-alpha in the brain.@*RESULTS@#The brain water and sodium contents in the ST group were significantly higher than those on the TT group, and those on the 1st day were higher than those on the 3 th day. The positive expression of TNF-alpha and in the change of water content were identical in the TT group and the ST group.@*CONCLUSION@#Thrombin preconditioning can alleviate the thrombin-induced brain edema. The increase of TNF-alpha expression after thrombin treatment may be related to the thrombin-induced brain edema.
Subject(s)
Animals , Male , Rats , Brain , Metabolism , Brain Edema , Metabolism , Therapeutics , Ischemic Preconditioning , Rats, Sprague-Dawley , Thrombin , Therapeutic Uses , Tumor Necrosis Factor-alpha , MetabolismABSTRACT
Objective To study the effects of erythrecyte on brain edema after traumatic intrace- rebral hemorrhage(TICH)and explore the mechanisms of erythrocyte in brain edema development follow- ing TICH.Methods Firstly,the brain injury model of SD rat was established by applying a free-fall- ing device,then whole blood(WB),lysed RBC(LRBC)or parked RBC(PRBC)were infused with ste- reotactic guidance into injured cortex to produce the model of TICH.All rats were killed at 1,3,and 5 days after injury.The brain water content was measured,immunohistochomistry(SABC)was applied to test HO-1 and TNF-?expressions.Results 1.In WB group,PRBC group and TBI group,the brain water content was the highest on the third day.The brain water content of LRBC group was markedly higher on the first day than on the third and fifth days.Comparison among the four groups showed the wa- ter content was the highest on the 1st day in LRBC group,and on the 3rd day in WB and PRBC groups; there was no significant difference among the four groups on 5th day.2.The positive expression of HO-1 and TNF-?coincided with the change of the water content in groups of WB,PRBC and LRBC.Conclu- sions In rat model of TICH,RBC plays an important role in delayed brain edema formation(3 days after injury),but has no influence at early stage(1 day after injury).The mechanisms of delayed brain edema involves RBC breakdown and inflammation reaction.