(1.School of Physical Education,Weifang University,Weifang 261061,China;2.School of Physical Education,Luoyang Normal University,Luoyang 471022,China) Abstract: In order to probe into the effects of exercising preadaptation on ulcerative colitis and its possible mecha-nism, the authors divided 24 C57BL/6 mice randomly into an exercising adaptation group (Ex), a model group (DSS) and a placebo control group (C), each of which contained 8 mice, let the mice in group Ex exercise on a treadmill for 8 weeks, feed the mice in groups DSS and C in a calm condition for 8 weeks, then let the mice in groups EX and DSS drink a 3.5% dextran sulfate sodium (DSS) solution freely to induce a mouse UC model, let the mice in group C drink the same amount of distilled water freely, observed and recorded disease activity index eve-ryday, and 7 days later, killed the mice, took out inflamed intestinal tissues, observed their pathological changes and gave them an inflammation score, measured interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) mRNA ex-pression levels by means of real-time florescence quantification PCR (RT-qPCR), as well as Toll-like receptor 4 (TLR4), total nuclear factor-κB (NF-κB) p65 and nuclear NF-κB p65 protein expression levels by means of Western blot, and revealed the following findings: the mice in group DSS showed typical UC clinical manifestations and histopathological changes, their DAI score, tissue inflammation score, IL-1β and TNF-α mRNA expression levels as well as TLR4 and nuclear NF-κB p65 protein expression levels were all higher than those of the mice in group C (P<0.01); the symptoms and histopathological changes of the mice in group Ex were alleviated as compared with the mice in group DSS, their DAI score, tissue inflammation score, IL-1β and TNF-α mRNA expression levels as well as TLR4 and nuclear NF-κB p65 protein expression levels were all lower than those of the mice in group DSS (P<0.01); there was no significant difference in total NF-κB p65 protein expression level between the mice in these three groups. The said findings indicate that long-term medium intensity exercising preadaptation can prevent UC and alleviate UC condition, and that its mechanism may be related to suppressing the signal pathway of TLRs﹣NF-κB and down-regulating the gene expression of downstream inflammatory factors. Key words: sports medicine;exercising preconditioning;ulcerative colitis;signal transduction;inflammatory factor;mouse |