葛根芩连汤降低TNF-α水平改善小鼠溃疡性结肠炎机制研究

目的探究葛根芩连汤对葡聚糖硫酸钠(DSS)诱导小鼠溃疡性结肠炎(UC)的抗炎作用。方法34只C57BL/6小鼠按随机数字表法分为空白组8只、模型组10只、柳氮磺吡啶组(260 mg/kg)8只和葛根芩连汤组(390 mg/kg)8只。除空白组外,其余各组小鼠自由饮用2.5%DSS建立UC小鼠模型,建模成功后,柳氮磺吡啶组、葛根芩连汤组小鼠每天给予相应药物灌胃,其余组给予等体积(10 mL/kg)生理盐水。每天观察小鼠体质量、大便性状、神态等一般情况的变化,并参照疾病活动指数(DAI)表进行评分。实验结束时采集结肠组织标本,采用苏木素-伊红(HE)染色观察各组小鼠结肠组织病理改变进行结肠组织学评分,酶联免疫吸附测定(ELISA)检测小鼠血清肿瘤坏死因子-α(TNF-α)和白细胞介素-1β(IL-1β)水平。结果与空白组比较,模型组小鼠体质量明显下降,出现腹泻、血便,DAI评分[(1.43±0.47)分比(0.00±0.00)分,P<0.05]、组织学评分[(6.80±3.99)分比(0.00±0.00)分,P<0.05]、血清IL-1β[(49.14±18.52)pg/mL比(28.70±5.68)pg/mL,P<0.05]和TNF-α[(405.77±82.06)pg/mL比(295.32±60.93)pg/mL,P<0.05]水平显著上升,结肠明显缩短[(5.40±0.41)cm比(7.07±0.61)cm,P<0.05]。经葛根芩连汤干预后,与模型组比较,葛根芩连汤组小鼠体质量、大便情况等明显改善,DAI评分、组织学评分和血清IL-1β水平无明显差异(P>0.05),血清TNF-α[(362.36±71.37)pg/mL比(405.77±82.06)pg/mL,P<0.05]水平降低,结肠组织形态明显改善,但结肠长度无明显变化(P>0.05)。与柳氮磺吡啶组比较,葛根芩连汤组小鼠血清TNF-α[(363.36±71.37)pg/mL比(443.82±49.31)pg/mL,P<0.05]水平下降。结论葛根芩连汤能一定程度改善DSS诱导的UC小鼠结肠组织病理情况,其机制可能与下调炎性因子TNF-α表达有关。

Influence of the Type of the Pulverized Coal Concentrator on the Operation of a Tangential Fired Boiler with Horizontal Bias Combustion

In this paper, the problems of combustion instability and high-temperature corrosion of pulverized coal fired boiler are investigated by numerical simulation and analysis of the momentum moment. Elbow and twisting plate type of burners are used in the boiler, and the reverse moment of momentum is formed at the outlet of the fuel-rich side of the burner. The momentum moment in the boiler is opposite to the designed tangential circle, and the tangential circle in the boiler is reversed rotation. The reverse moment of momentum at the burner outlet can be eliminated by using louver horizontal bias pulverized coal burner, while the problems of combustion instability and high-temperature corrosion of the boiler are solved, and the combustion efficiency is improved. Accordingly,economic benefit is obviously got.