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CD14 plays a crucial role in the inflammatory response to lipopolysaccharide (LPS), which interacts with TLR4 and MD-2 to enable cell activation, resulting in inflammation. Upstream inhibition of the inflammation pathway mediated by bacterial LPS, toll-like receptor 4 (TLR4) and cluster of differentiation antigen 14 (CD14) was proven to be an effective therapeutic approach for attenuating harmful immune activation. To explore the effect of CD14 downregulation on the expression of TLR4 signaling pathway-related genes after LPS stimulation in buffalo (Bubalus bubalis) monocyte/macrophages, effective CD14 shRNA sequences were screened using qRT-PCR and FACS analysis with buffalo CD14 shRNA lentiviral recombinant plasmids (pSicoRGFP-shRNA) and buffalo CD14 fusion expression plasmids (pDsRed-N1-buffalo CD14) co-transfected into HEK293T cells via liposomes. Of the tested shRNAs, shRNA-1041 revealed the highest knockdown efficiency (p &lt; 0.01). When buffalo peripheral blood monocyte/macrophages were infected with shRNA-1041 lentivirus and stimulated with LPS, the expression of endogenous CD14 was significantly decreased by CD14 shRNA (p &lt; 0.01), and the mRNA expression levels of TLR4, IL-6 and TNF-α were also significantly downregulated compared to the control groups (p &lt; 0.01). These results demonstrated that the knockdown of endogenous CD14 had clear regulatory effects on the signal transduction of TLR4 after stimulation with LPS. These results may provide a better understanding of the molecular mechanisms of CD14 regulation in the development of several buffalo diseases.

The effect of buffalo CD14 shRNA on the gene expression of TLR4 signal pathway in buffalo monocyte/macrophages