文献类型： 外文期刊

作者： Zhu, Honglong ¹ ; Yang, Yongxin ² ; Wu, Tao ¹ ; Qi, Yunxia ¹ ; Huang, Dongwei ¹ ; Han, Rongwei ² ; Chen, Sheng ¹ ; Tang, Jishun ¹ ; Ren, Man ³ ; Zhao, Xiaowei ¹ ;

作者机构： 1.Anhui Acad Agr Sci, Inst Anim Sci & Vet Med, Anhui Prov Key Lab Livestock & Poultry Prod Safet, Hefei 230031, Anhui, Peoples R China

2.Qingdao Agr Univ, Coll Food Sci & Engn, Qingdao 266109, Peoples R China

3.Anhui Sci & Technol Univ, Coll Anim Sci, Anhui Prov Key Lab Anim Nutr Regulat & Hlth, Bangbu 233100, Peoples R China

关键词： Inflammatory cytokines; Intestinal barrier; Mucosa growth; Sheep; Toll-like receptors

期刊名称：ANIMAL （ 影响因子：3.73； 五年影响因子：3.908 ）

ISSN： 1751-7311

年卷期： 2022 年 16 卷 8 期

页码：

收录情况： SCI

摘要： The contribution of colostrum to passive immunity transfer and intestinal protection in newborn ruminants is well known; however, it is currently unclear how colostrum intake affects intestinal innate immunity. We investigated the effects of bovine colostrum intake on ileal morphology, expression of genes involved in intestinal innate immunity, and serum concentrations of inflammatory cytokines in newborn lambs. Twenty-seven newborn male Hu lambs were used, of which 18 were bottle-fed either bovine colostrum (C24h; n = 9) or bovine mature milk (M24h; n = 9) within the first 2 h after birth at an intake of approximately 8% of BW; the remaining nine lambs did not receive any feeding (N24h). Blood and ileal tissue samples were collected after the lambs were slaughtered at 24 h after birth. Ileal villus height and villus height-to-crypt depth ratio were significantly higher in C24h than those in N24h and M24h lambs (P < 0.01). Messenger RNA (mRNA) abundance of toll-like receptor (TLR)-2, TLR3, TLR4, TLR6, TLR7, TLR8 and tumour necrosis factor alpha in the ileum was lower in C24h than that in N24h lambs (P < 0.05). Moreover, C24h lambs had a lower TLR3 mRNA abundance (P < 0.01) and a trend of lower TLR6 (P = 0.06) and interleukin 1 beta (P = 0.08) expression compared with those in M24h lambs. We also observed strong positive correlations of tumour necrosis factor alpha expression with that of TLR2 (r = 0.71; P < 0.001), TLR4 (r = 0.88; P < 0.001) and TLR8 (r = 0.83; P < 0.001). Interestingly, the expression of barrier-related molecules, including mucin-13, lysozyme, claudin (CLDN)-1, CLDN2, CLDN4, CLDN7, CLDN12, occludin, zonula occluden-1 and junctional adhesion molecule-1, was consistently lower in C24h lambs than that in N24h and M24h lambs (P < 0.05). These results indicated that the beneficial roles of colostrum intake on intestinal protection in newborn lambs were associated with low TLR expression, which was reflected by improved intestinal development and reduced inflammatory response. Further studies using fluorescence in situ hybridisation and immunohistochemical methods are needed to further explore the mechanisms underlying the lower expression of intestinal barrier-related molecules due to colostrum feeding. (C) 2022 The Authors. Published by Elsevier B.V. on behalf of The Animal Consortium.