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Effect Of Seasonal Variance On Intestinal Epithelial Barriers And The Associated Innate Immune Response Of The Small Intestine Of The Chinese Soft-Shelled Turtles

文献类型： 外文期刊

作者： Shi, YH; Vistro, WA; Bai, XB; Wu, RZ; Chen, C; Huang, YF; Fazlani, SA; Tarique, I; Yang, P; Chen, QS

作者机构：

关键词： Intestinal Epithelial Barrier; Zo-1; Cx43; Muc2; Innate Immune Response; Chinese Soft-Shelled Turtle

期刊名称： FISH & SHELLFISH IMMUNOLOGY

ISSN： 1050-4648

年卷期： 2020 年 97 卷

页码：

收录情况： JCR（2021版）

摘要： It is conceivable that pathological conditions can cause intestinal barrier disruption and innate immune dysfunction. However, very limited information has been reported on the effect of seasonal variance on intestinal barriers and innate immunity. The present study was designed to investigate the seasonal variance in intestinal epithelial barriers and the associated innate immune response of turtle intestines during hibernation and non-hibernation periods. Goblet cells (GCs) demonstrated dynamic actions of the mucosa] barrier with strong Muc2 protein expression during hibernation. However, weak Muc2 expression during nonhibernation was confirmed by immunohistochemistry, immunofluorescence and immunoblotting. Furthermore, light and transmission electron microscopy revealed that the hypertrophy of GCs resulted in the hypersecretion of mucus granules (MGs) and created a well-developed mucosa] layer during hibernation. The absorptive cells (ACs), forming a physical barrier of tight junctions, and desmosomes were firmly anchored during hibernation. Conversely, during nonhibernation, the integrity of tight junctions, adherence junctions and desmosomes was noticeable expanded, causing increased paracellular permeability. As further confirmation, there was strong zonula occluden-1 (ZO-1) and connexins 43 (Cx43) protein expression during hibernation and weak ZO-1 and Cx43 expression during nonhibernation. Moreover, the expression level of the innate immune response proteins Toll-like receptors 2 and 4 (TLR2 and 4) were enhanced during hibernation and were reduced during nonhibernation. These results provide rich information about the seasonal fluctuations that interrupt intestinal epithelial barriers and innate immune response, which might be essential for protection and intestinal homeostasis.

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