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Hypogalactia in mammary quarters adjacent to lipopolysaccharide-infused quarters is associated with transcriptional changes in immune genes

基因 免疫系统 内科学 免疫学 内分泌学
作者
E. M. Shangraw,R.O. Rodrigues,Ratan K. Choudhary,Feng-Qi Zhao,T.B. McFadden
出处
期刊:Journal of Dairy Science [Elsevier]
卷期号:104 (8): 9276-9286 被引量:1
标识
DOI:10.3168/jds.2020-20048
摘要

Infusion of lipopolysaccharides (LPS) into a mammary gland can provoke inflammatory responses and impair lactation in both the infused gland and neighboring glands. To gain insight into the mechanisms controlling the spatiotemporal response to localized mastitis in lactating dairy cows, we performed RNA sequencing on mammary tissue from quarters infused with LPS, neighboring quarters in the same animals, and control quarters from untreated animals at 3 and 12 h postinfusion. Differences in gene expression were annotated to Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. Comparing mammary transcriptomes from all 3 treatments revealed 3,088 and 1,644 differentially expressed (DE) genes at 3 and 12 h, respectively. Of these genes, >95% were DE only in LPS-infused quarters and represented classical responses to LPS: inflammation, apoptosis, tissue remodeling, and altered cell signaling and metabolism. Although relatively few genes were DE in neighboring quarters (56 at 3 h; 74 at 12 h), these represented several common pathways. At 3 h, tumor necrosis factor (TNF), nuclear factor-κB, and nucleotide-binding and oligomerization domain (NOD)-like receptor signaling pathways were identified by the upregulation of anti-inflammatory (NFKBIA, TNFAIP3) and cell adhesion molecule (VCAM1, ICAM1) genes in neighboring glands. Additionally, at 12 h, several genes linked to 1-carbon and serine metabolism were upregulated. Some responses were also regulated over time. The proinflammatory response in LPS-infused glands diminished between 3 and 12 h, indicating tight control over transcription to re-establish homeostasis. In contrast, 2 glucocorticoid-responsive genes, FKBP5 and ZBTB16, were among the top DE genes upregulated in neighboring quarters at both time points, indicating potential regulation by glucocorticoids. We conclude that a transient, systemic immune response was sufficient to disrupt lactation in neighboring glands. This response may be mediated directly by proinflammatory factors from the LPS-infused gland or indirectly by secondary factors released in response to systemic inflammatory signals.
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