Direct effect of lipopolysaccharide and histamine on permeability of the rumen epithelium of steers ex vivo

文献类型： 外文期刊

第一作者： Gao, Shengtao

作者： Gao, Shengtao;Zhula, Alateng;Liu, Wenhui;Ma, Lu;Bu, Dengpan;Lu, Zhongyan;Shen, Zanming;Penner, Gregory B.

作者机构：

关键词： gastrointestinal tract; permeability; subacute rumen acidosis

期刊名称：JOURNAL OF ANIMAL SCIENCE （ 影响因子：3.338； 五年影响因子：3.243 ）

ISSN： 0021-8812

年卷期： 2022 年 100 卷 2 期

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收录情况： SCI

摘要： Lay Summary Lipopolysaccharide and histamine are common chemicals in rumen when the ruminant animal takes too much concentrate. We wandered whether these two chemicals have direct effects on the rumen tissues. Using Ussing chamber, we found that histamine could directly improve the permeability of rumen barrier. Histamine plays a direct role in the disruption of ruminal epithelium barrier function, whereas lipopolysaccharide (at a pH of 7.4) has no effect on the permeability of rumen tissues ex vivo. Disruption of the ruminal epithelium barrier occurs during subacute ruminal acidosis due to low pH, hyper-osmolality, and increased concentrations of lipopolysaccharide and histamine in ruminal fluid. However, the individual roles of lipopolysaccharide and histamine in the process of ruminal epithelium barriers disruption are not clear. The objective of the present investigation was to evaluate the direct effect of lipopolysaccharide and histamine on the barrier function of the ruminal epithelium. Compared with control (CON), histamine (HIS, 20 mu M) increased the short-circuit current (Isc; 88.2%, P < 0.01), transepithelial conductance (Gt; 29.7%, P = 0.056), and the permeability of fluorescein 5(6)-isothiocyanate (FITC) (1.04-fold, P < 0.01) of ruminal epithelium. The apparent permeability of LPS was 1.81-fold higher than HIS (P < 0.01). The mRNA abundance of OCLN in ruminal epithelium was decreased by HIS (1.1-fold, P = 0.047). The results of the present study suggested that mucosal histamine plays a direct role in the disruption of ruminal epithelium barrier function, whereas lipopolysaccharide (at a pH of 7.4) has no effect on the permeability of rumen tissues ex vivo.

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