ArticleBiochemical genetics2025
Comparative Analysis of Intestinal TLR4 Gene Expression and Functional Verification in Lepus yarkandensis and Oryctolagus cuniculus.
Article in Biochemical genetics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- The Functional Identification of theInternational journal of molecular sciences · 2025Article
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6 authors.
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Abstract
Lepus yarkandensis live year-round in harsh desert environments and are less susceptible to enteritis. The living conditions of Oryctolagus cuniculus in captivity were suitable, but they were highly susceptible to death by Gram-negative bacteria infected with inflammatory bowel disease complex.TLR4 is closely related to the occurrence of enteritis, and the neighbor-joining topology based on the 12S rDNA sequences showed that the relationship between O. cuniculus and L. yarkandensis is as high as 98%.Therefore, we chose O. cuniculus and L. yarkandensis for comparative study.The purpose of this study was to investigate the role of Toll-like receptor 4 (TLR4) in the regulation of immunity and inflammation in the intestinal tract of L. yarkandensis. In this study, the TLR4 gene was cloned for the first time in the colon of L. yarkandensis. The expression of TLR4 in the intestinal tissues of L. yarkandensis and O. cuniculus was detected by histological observation, real-time fluorescence quantification PCR(qRT-PCR), and protein blotting (Western blot).An LPS-induced cell inflammation model was constructed in vitro, and ELISA was used to examine the effect of pEGFP-N1-TLR4 and siRNA knockout on the anti-inflammatory ability of the TLR4 gene. The results showed that the open reading frame of the L. yarkandensis TLR4 gene was 2520 bp in length. Compared with the sequence of O. cuniculus, there were 15 differences in the TLR4 amino acid sequence of L. yarkandensis, 12 of which occurred in the LRR domain and 2 in the TIR domain, and the sequence changed from G to D at position 298. Immunohistochemistry showed that TLR4 was mainly expressed in the epithelial cells of the colon L. yarkandensis, and the expression level of TLR4 in the cecum and colon was significantly lower compared with that of O. cuniculus. qRT-PCR and Western blot results showed that the expression level of TLR4 in the colon of L. yarkandensis was significantly lower than that of O. cuniculus. At the cellular level, ELISA showed that overexpression of the TLR4 protein in L. yarkandensis could reduce the LPS-induced inflammatory response. Therefore, according to the above results, the protein structure and function of L. yarkandensis TLR4 may be different due to the change of nucleotide, which affects its binding with LPS and the activation of downstream molecules, so that L. yarkandensis is not prone to enteritis and can adapt to the harsh desert environment for a long time. This study also laid the foundation for improving the disease resistance of O. cuniculus and promoting the development and utilization of genes in L. yarkandensis.
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