运输压力引发了空气道炎症反应的悖论性增加,这种反应发生在肉类养殖牛群中
Grace M Jakes1, Dylan T Ammons1, Randy Hunter2
1Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado, United States of America.
PloS one
|February 6, 2026
概括
运输压力在牛肉养小牛引发肺炎和增加中性粒细胞,即使没有感染. 这种免疫反应影响了牛呼吸道疾病 (BRD) 的发展.
科学领域:
- 兽医免疫学 兽医免疫学
- 动物健康 动物健康
- 呼吸系统病原体的产生
背景情况:
- 牛呼吸系统疾病 (BRD) 与拍卖和运输的压力有关.
- 压力会影响牛的免疫功能,往往导致免疫抑制.
- 研究主要集中在外周免疫力上,而不是粘膜反应.
研究的目的:
- 为了研究由压力引起的肺粘膜免疫力的变化,在牛肉养殖牛.
- 描述BRD病原体殖民的主要部位的免疫反应.
- 了解压力在BRD病变发生过程中的作用.
主要方法:
- 从受压力 (拍卖后/运输后) 和适应的小牛中收集的支气管洗液 (BALF).
- 在BALF细胞上进行大量RNA测序 (RNA-seq),用于基因表达分析.
- 使用CIBERSORTx来解构细胞群并预测比例.
主要成果:
- 受到压力的小牛表现出肺细胞中炎症基因 (例如CXCL8,IL1B) 的显著上调.
- 关键上调的途径包括中性粒细胞迁移,化学反应和细胞因子信号传递.
- 压力小牛在BALF中中性粒细胞的比例显著更高,独立于病原体的存在.
结论:
- 运输压力导致牛肉养小牛的炎症性肺粘膜免疫反应升高.
- 这种由压力引起的炎症在没有病原体殖民之前发生或发生.
- 研究结果强调了压力在BRD病变发生过程中的关键作用,并提出了潜在的治疗点.
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