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Mechanisms underlying reduced expulsion of a murine nematode infection during protein deficiency

机译:蛋白质缺乏期间鼠线虫感染减少驱逐的潜在机制

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Balb/c mice infected with the gastrointestinal nematode Heligmosomoides bakeri were fed protein sufficient (PS, 24%) or deficient (PD, 3%) diets to investigate whether diet, infection or dose of larval challenge (0,100 or 200 larvae) influenced gut pathophysiology and inflammation. Among the PS mice, worms were more posteriorad in the intestine of mice infected with 200 compared with 100 larvae, suggesting active expulsion in the more heavily infected mice. This was consistent with the positive correlation between worm numbers and fluid leakage in PS mice; similar patterns were not detected in the PD mice. Infection also induced villus atrophy, which was more pronounced in PS than in PD mice. Our cytokine screening array indicated that infection in PD mice elevated a wide range of pro-inflammatory cytokines and chemokines. Whereas serum leptin concentrations were higher in PD mice, monocyte chemotactic protein-5 (MCP-5) in serum increased with increasing larval dose and concentrations were lower in PD than PS mice. We suggest that elevated MCP-5 together with villus atrophy may contribute to the apparent dose-dependent expulsion of H. bakeri from PS mice but that delayed expulsion in PD mice appeared related to a predominant Thl cytokine profile that may be driven by leptin.
机译:喂食饱食性肠线虫Heligmosomoides bakeri的Balb / c小鼠蛋白质充足(PS,24%)或蛋白质缺乏(PD,3%)的饮食,以调查饮食,感染或幼虫攻击剂量(0,100或200幼虫)是否会影响肠道病理生理学和炎症。在PS小鼠中,蠕虫在200只受感染的小鼠的肠道中比100只幼虫更多,这表明在感染较重的小鼠中主动驱除蠕虫。这与PS小鼠的蠕虫数量和体液渗漏之间呈正相关。在PD小鼠中未检测到相似的模式。感染还引起绒毛萎缩,在PS中比在PD小鼠中更为明显。我们的细胞因子筛选阵列表明,PD小鼠中的感染升高了多种促炎性细胞因子和趋化因子。 PD小鼠的血清瘦素浓度较高,而幼虫剂量增加时,血清中的单核细胞趋化蛋白5(MCP-5)增加,PD的浓度低于PS小鼠。我们建议,升高的MCP-5以及绒毛萎缩可能有助于从PS小鼠中驱逐面包酵母的明显剂量依赖性,但PD小鼠中的延迟排出似乎与瘦素驱动的主要Thl细胞因子谱有关。

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