Small molecule inhibitor CRT0066101 inhibits cytokine storm syndrome in a mouse model of lung injury

The role of TLR4/NF-kB signaling axis in pneumonia: from molecular mechanisms to regulation by phytochemicals

Pneumonia, a leading global health challenge, is characterized by inflammation driven by dysregulated immune responses. Central to its pathogenesis is the Toll-like receptor 4 (TLR4)/nuclear factor-κB (NF-κB) signaling axis, which orchestrates the recognition of pathogen-associated molecular patterns (PAMPs) and initiates cascades that mediate innate immunity. While this pathway is essential for bacterial clearance, its overactivation can lead to excessive inflammation, tissue damage, and severe complications, including acute respiratory distress syndrome (ARDS) and sepsis. This review examines the role of the TLR4/NF-κB axis in pneumonia caused by various pathogens, including Streptococcus pneumoniae, Staphylococcus aureus, and SARS-CoV- 2, and highlights its dual role in immune defense and pathological inflammation. Furthermore, we explore molecular regulators and phytochemicals that modulate this axis, including baicalin, resveratrol, and sodium houttuyfonate, which exhibit promising therapeutic potential. By elucidating these mechanisms, this study provides insights into targeted interventions to balance immune responses and mitigate inflammation, paving the way for innovative treatments in pneumonia management.

Exploring immune-related pathogenesis in lung injury: Providing new insights Into ALI/ARDS

Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) represent a significant global burden of morbidity and mortality, with lung injury being the primary cause of death in affected patients. The pathogenesis of lung injury, however, remains a complex issue. In recent years, the role of the immune system in lung injury has attracted extensive attention worldwide. Despite advancements in our understanding of various lung injury subtypes, significant limitations persist in both prevention and treatment. This review investigates the immunopathogenesis of ALI/ARDS, aiming to elucidate the pathological processes of lung injury mediated by dendritic cells (DCs), natural killer (NK) cells, phagocytes, and neutrophils. Furthermore, the article expounds on the critical contributions of gut microbiota, inflammatory pathways, and cytokine storms in the development of ALI/ARDS.

Rosavin Alleviates LPS-Induced Acute Lung Injure by Modulating the TLR-4/NF-κB/MAPK Singnaling Pathways

Acute lung injury (ALI) is a serious inflammatory disease with high morbidity and mortality. Rosavin is an anti-inflammatory and antioxidant phenylpropanoid and glucoside, which is isolated from Rhodiola rosea L. However, its potential molecular mechanisms and whether it has protective effects against lipopolysaccharide (LPS)-induced ALI remain to be elucidated. To assess the in vitro anti-inflammatory effects and anti-lung injury activity of rosavin, RAW264.7 and A549 cells were stimulated using 1 μg/mL LPS. Rosavin attenuated LPS-induced activation of the TLR-4/NF-κB signaling pathway in RAW264.7 cells and inhibited LPS-induced release of inflammatory factors in A549 cells. A mouse model of acute lung injury was constructed by intraperitoneal injection of 5 mg/kg LPS to observe the therapeutic effect of rosavin. Transcriptomics analysis and Western blot assays were utilized to verify the molecular mechanism, rosavin (20, 40, and 80 mg/kg) dose-dependently ameliorated histopathological alterations, reduced the levels of inflammatory factors, and inhibited the TLR-4/NF-κB/MAPK signaling pathway and apoptosis activation. Rosavin is a promising therapeutic candidate for acute lung injury by inhibiting the TLR-4/NF-κB/MAPK pathway.