Identification, characterization, and anti-inflammatory activity of a lipocalin-like protein cloned from Oenanthe javanica

This study investigated the anti-inflammatory effects of OJlipo1, a lipocalin-like protein derived from Oenanthe javanica. Through cloning and expressing OJlipo1 in E. coli, and subsequent rigorous characterization including amino acid analysis and mass spectrometry, its potential against inflammation was evaluated. Studies on lipopolysaccharide-stimulated RAW 264.7 cells highlighted its capability to suppress nitric oxide synthase and cyclooxygenase-2 expression, as well as its interference with nuclear factor kappa B and mitogen-activated protein kinase pathways, which are essential for toll-like receptor 4 (TLR4) signaling. Utilizing TAK242, a TLR4 pathway inhibitor, reinforced OJlipo1’s specific targeting mechanism. These findings underscore OJlipo1’s significant anti-inflammatory potential, aligning with the traditional uses of O. javanica, and suggest new therapeutic avenues, especially for diseases associated with TLR4 dysregulation. This validates the traditional application of O. javanica in inflammation and positions OJlipo1 as a promising therapeutic candidate, enriching our understanding of its molecular underpinnings and therapeutic prospects.