Tenascin-C Participates Pulmonary Injury Induced by Paraquat Through Regulating TLR4 and TGF-β Signaling Pathways

Area of Science:

• Pulmonary Medicine
• Toxicology
• Cell Biology

Background:

• Paraquat (PQ) is a herbicide causing severe lung injury.
• The role of Tenascin-C (TNC) in PQ-induced lung injury is not well understood.

Purpose of the Study:

• To investigate the role of TNC in paraquat (PQ)-induced lung injury.
• To explore the underlying mechanisms involving TLR4 and TGF-β signaling pathways.

Main Methods:

• In vivo study using a mouse model of PQ-induced lung injury.
• In vitro study using A549 cells with TNC knockdown via siRNA.
• Analysis of TNC, TLR4, NF-κB p65, TGF-β1, and α-SMA expression using RT-qPCR, Western blotting, and immunohistochemistry.

Main Results:

• PQ administration increased TNC expression in mouse lungs and A549 cells.
• TNC was localized in the extracellular matrix of injured lung tissue.
• TNC knockdown significantly reduced PQ-induced upregulation of TLR4, NF-κB p65, and TGF-β1.

Conclusions:

• Tenascin-C (TNC) is involved in the pathogenesis of paraquat (PQ)-induced lung injury.
• TNC's role is mediated through the regulation of TLR4 and TGF-β signaling pathways.
• TNC represents a potential therapeutic target for PQ poisoning.