Organophosphorus poisoning (OP) is a significant concern due to its potential to induce severe multiorgan dysfunction, often resulting from pesticide intoxication. The standard treatment for OP involves the administration of pralidoxime methiodide and atropine, which, when combined with lipid emulsion therapy, has been shown to improve clinical outcomes. However, the therapeutic mechanisms behind this combined treatment approach remain poorly understood. To address this knowledge gap, researchers established an OP rat model to investigate the effects of different treatment strategies on the progression of OP. The rat model allowed for a comprehensive assessment of the disease, including histopathological evaluation, quantification of LPS/Toll-like receptor 4 (TLR4), measurement of inflammatory cytokines, and analysis of cytokine mRNA expression. The study's findings revealed that when rats with OP were treated with either standard treatment or lipid emulsion alone, the symptoms of poisoning were only slightly alleviated. In contrast, the combination of standard treatment and lipid emulsion resulted in significant alleviation of symptoms, accompanied by a decrease in TLR4 expression levels. Furthermore, the use of anti-TLR4 intervention to block the LPS/TLR4 pathway led to significant improvements in liver function, acetylcholinesterase (AchE) levels, and pathology in the lungs and heart. Additionally, the expression of TLR4 in the heart and lungs decreased, and inflammatory cytokine levels were reduced. These results suggest that lipid emulsion exerts a protective effect on vital organs in acute OP through the LPS/TLR4 pathway. The study's findings provide valuable insights into the therapeutic mechanisms underlying the combined treatment approach and highlight the potential of lipid emulsion as a beneficial adjunct therapy in the management of OP. The relief of symptoms and improvement in organ function observed in this study demonstrate the importance of understanding the molecular mechanisms involved in OP and the development of effective treatment strategies to mitigate its effects. Link: https://pubmed.ncbi.nlm.nih.gov/40148919/