Assessment of heat stress response of peripheral blood mononuclear cells from dairy cows' stress phenotyped using bacterial lipopolysaccharide endotoxin.

IF 4.4 1区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Nieve Komadan, Umesh K Shandilya, Angela Canovas, Bonnie A Mallard, Niel A Karrow
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引用次数: 0

Abstract

Heat stress (HS) can affect gut barrier integrity, leading to a leaky gut and elevated enteric bacterial LPS endotoxin levels in the circulation. This LPS can induce systemic inflammation manifesting as the acute-phase response, which includes a febrile response that may compromise heat dissipation from the body during HS. To assess the effects of HS, peripheral blood mononuclear cells (PBMC) were isolated from dairy cows that were previously stress phenotyped based on their 4-h serum cortisol response to Escherichia coli LPS (200 ng/kg administered i.m.). After stress phenotyping, a population of dairy calves (n = 260), 8 high stress responder (HSR; +1 SD from the mean, >956.0 pg/mL), 11 middle stress responder (MSR; ± SD around the mean of 573.4 pg/mL), and 11 low stress responder (LSR; -1 SD from the mean, <190.8 pg/mL) stress-responding animals were selected for the study. The PBMC were later isolated and subjected to a heat shock challenge (HSC) in vitro at 42°C for 4 h then returned to 37°C where the control plates remained. Cell viability and proliferation were assessed, culture supernatants were collected to assess cytokine and chemokine secretion, and total RNA was extracted to assess candidate gene expression. There was a significant increase in the apoptosis of PBMC from the HSR and MSR, as compared with the LSR group post-HSC. However, there was a significant increase in necrosis in the LSR PBMC as compared with other groups following HSC. Proinflammatory and anti-inflammatory cytokine and chemokine production, specifically IFN-γ, IL-8, and MCP-1, was influenced by HSC and different across treatment groups. Finally, there was a significant increase in the expression of HSP90 and HSP70 genes in HSC MSR PBMC compared with the CNT MSR PBMC. Collectively, these results demonstrate that PBMC from variable stress-responding cows respond differently to the HSC. Future research is warranted to investigate if this phenotype can be used to improve the HS resilience of dairy cattle through selective breeding.

利用细菌脂多糖内毒素对奶牛外周血单核细胞热应激反应的评价。
热应激(HS)会影响肠道屏障的完整性,导致肠道渗漏和循环中肠道细菌LPS内毒素水平升高。这种脂多糖可以诱导全身性炎症,表现为急性期反应,其中包括发热反应,可能会损害HS期间身体的散热。为了评估HS的作用,从奶牛的外周血单核细胞(PBMC)中分离出来,这些奶牛先前根据对大肠杆菌LPS (200 ng/kg灌胃)的4小时血清皮质醇反应进行应激表型。对260头奶牛进行应激表型分型后,得到8头高应激反应奶牛(HSR,平均值+1 SD,约为956.0 pg/mL), 11头中等应激反应奶牛(MSR,平均值±SD约为573.4 pg/mL), 11头低应激反应奶牛(LSR,平均值-1 SD)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Dairy Science
Journal of Dairy Science 农林科学-奶制品与动物科学
CiteScore
7.90
自引率
17.10%
发文量
784
审稿时长
4.2 months
期刊介绍: The official journal of the American Dairy Science Association®, Journal of Dairy Science® (JDS) is the leading peer-reviewed general dairy research journal in the world. JDS readers represent education, industry, and government agencies in more than 70 countries with interests in biochemistry, breeding, economics, engineering, environment, food science, genetics, microbiology, nutrition, pathology, physiology, processing, public health, quality assurance, and sanitation.
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