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ZHANG Tingting, MEI Yinliu, DONG Wanfa, WANG Jingxun, JIN Liang, WU Jie. Protective effect of staphylococcal nuclease on 2, 4, 6-trinitro-benzene sulfonic acid-induced colitis in mice[J]. Journal of China Pharmaceutical University, 2020, 51(2): 198-205. DOI: 10.11665/j.issn.1000-5048.20200211
Citation: ZHANG Tingting, MEI Yinliu, DONG Wanfa, WANG Jingxun, JIN Liang, WU Jie. Protective effect of staphylococcal nuclease on 2, 4, 6-trinitro-benzene sulfonic acid-induced colitis in mice[J]. Journal of China Pharmaceutical University, 2020, 51(2): 198-205. DOI: 10.11665/j.issn.1000-5048.20200211
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Protective effect of staphylococcal nuclease on 2, 4, 6-trinitro-benzene sulfonic acid-induced colitis in mice

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  • To explore the improving effect and mechanism of staphylococcal nuclease(SNase)-mediated degradation of neutrophil extracellular traps(NETs)on 2, 4, 6-trinitro-benzene sulfonic acid(TNBS)-induced colitis in mice. The model of colitis in female BALB/c mice was established by intrarectal injection of 2. 5% TNBS solution, and SNase loaded by Lactococcus lactis(L. lactis)were orally administrated for 6 days. To investigate the effect of SNase-mediated degradation of neutrophil extracellular traps on colitis in mice, the experiment was divided into control group, TNBS model group, NZ900 group and L. lactis pCYT: SNase group. The daily body weight, stool consistency and bleeding of mice were observed. The pathological condition of HE in colon group was detected. The activity of MPO and the mRNA expression level of inflammatory cytokines in each group were measured, and the concentration of inflammatory factors in serum was detected. The expression of NETs level marker citH3 in colon tissue was determined by immunohistochemistry. The results showed that SNase loaded by lactis acid bacteria could alleviate the weight loss, disease activity index score, colonic length and pathological damage induced by TNBS in mice, and reduce the levels of inflammatory cytokines in serum and colonic tissue, inhibit the activity of MPO and the expression of Ly6G and citH3 in colon tissue. The preliminary mechanism showed that SNase could down-regulate the expression of inflammatory cytokines and reduce the content of NETs markers to alleviate colitis in mice.
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