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

机译:在蛋白质缺乏期间降低鼠线导航性感染的机制

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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:感染胃肠线虫的BALB / C小鼠贝克西喂养蛋白质足够(PS,24%)或缺陷(PD,3%)饮食,以研究幼虫挑战(0,100或200幼虫)是否影响肠道病理生理学的饮食,感染或剂量和炎症。在PS小鼠中,与100只幼虫相比,蠕虫在感染的小鼠的肠道中更近似,表明在更严重的小鼠中积极排出。这与PS小鼠蠕虫数与液体泄漏之间的正相关;在Pd小鼠中未检测到类似的模式。感染还诱导绒毛萎缩,其在PS中比PD小鼠更加明显。我们的细胞因子筛选阵列表明PD小鼠的感染升高了各种促炎细胞因子和趋化因子。在Pd小鼠中血清瘦素浓度较高,血清中单核细胞趋化蛋白-5(MCP-5)随着幼虫剂量的增加而增加,Pd比Ps小鼠较低。我们认为,与绒毛萎缩的MCP-5升高可能有助于来自PS小鼠的表观剂量依赖性驱逐,但Pd小鼠中的延迟排出与可能由瘦蛋白驱动的主要Thl细胞因子曲线有关。

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