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Inhibition of c-Src protects paraquat induced microvascular endothelial injury by modulating caveolin-1
1Department of Intensive Care Medicine, The Third People's Hospital of Chengdu, The Second Affiliated Hospital of Chengdu, Chongqing Medical University, Chengdu, China.
Abstract:
The mechanisms underlying paraquat induced acute lung injury (ALI) is still not clear. C-Src plays an important role in the regulation of microvascular endothelial barrier function and the pathogenesis of ALI. In the present study, we found that paraquat induced cell toxicity and an increase of reactive oxygen species (ROS) in endothelium. Paraquat exposure also induced significant increase of caveolin-1 phosphorylation, caveolae trafficking and albumin permeability in endothelial monolayers. C-Src depletion by siRNA significantly attenuate paraquat induced cell toxicity, caveolin-1 phosphorylation, caveolae formation and endothelial hyperpermeability. N-acetylcysteine (NAC) failed to protect endothelial monolayers against paraquat induced toxicity. Thus, our findings suggest that paraquat exposure increases paracellular endothelial permeability by increasing caveolin-1 phosphorylation in a c-Src dependant manner. The depletion of c-Src might protect microvascular endothelial function by regulating caveolin-1 phosphorylation and caveolae trafficking during paraquat exposure, and might have potential therapeutic effects on paraquat induced ALI.
Insights
Paraquat causes lung injury by increasing endothelial permeability via c-Src and caveolin-1 phosphorylation. Inhibiting c-Src may protect against paraquat-induced acute lung injury (ALI).
Area of Science:
- Cell Biology
- Toxicology
- Pulmonary Medicine
Background:
- Paraquat is a herbicide that can cause acute lung injury (ALI).
- The exact mechanisms of paraquat-induced ALI are not fully understood.
- C-Src kinase is involved in regulating endothelial barrier function and ALI pathogenesis.
Purpose of the Study:
- To investigate the role of c-Src in paraquat-induced endothelial dysfunction and ALI.
- To explore the involvement of caveolin-1 phosphorylation and caveolae trafficking in paraquat toxicity.
- To assess the potential therapeutic effects of targeting c-Src in paraquat-induced ALI.
Main Methods:
- Endothelial cell cultures were exposed to paraquat.
- Cell toxicity, reactive oxygen species (ROS) production, and albumin permeability were measured.
- C-Src was depleted using small interfering RNA (siRNA).
- Caveolin-1 phosphorylation and caveolae formation were analyzed.
Main Results:
- Paraquat induced endothelial cell toxicity, increased ROS, and enhanced albumin permeability.
- Paraquat exposure led to increased caveolin-1 phosphorylation and caveolae trafficking.
- C-Src depletion significantly reduced paraquat-induced toxicity, caveolin-1 phosphorylation, and hyperpermeability.
- N-acetylcysteine (NAC) did not protect against paraquat-induced endothelial toxicity.
Conclusions:
- Paraquat increases endothelial permeability through c-Src-dependent caveolin-1 phosphorylation.
- C-Src plays a critical role in paraquat-induced endothelial barrier dysfunction.
- Targeting c-Src may offer a therapeutic strategy for managing paraquat-induced ALI.