ADAM-10 Regulates MMP-12 during Lipopolysaccharide-Induced Inflammatory Response in Macrophages

Area of Science:

• Immunology
• Molecular Biology
• Biochemistry

Background:

• Macrophages are key immune cells in inflammatory responses.
• The precise regulatory mechanisms of ADAM-10 in inflammation are not fully understood.
• ADAM-10 plays a role in various cellular processes including TNF-α activation and cell migration.

Purpose of the Study:

• To investigate the regulatory mechanism of ADAM-10 in lipopolysaccharide (LPS)-induced macrophage inflammatory response.
• To determine the role of ADAM-10 in macrophage proliferation and inflammation.
• To identify proteins regulated by ADAM-10 during LPS stimulation.

Main Methods:

• Tandem mass tag (TMT) proteomics to identify differentially expressed proteins in ADAM-10 interfered macrophages.
• Gene expression analysis (RT-qPCR) for ADAM-10, MMP-12, TNF-α, and other inflammatory markers.
• Protein expression analysis via flow cytometry and immunofluorescence staining.
• Cell viability assays and experiments using an MMP-12 inhibitor.

Main Results:

• ADAM-10 interference reduced inflammation-related pathways and matrix metalloproteinase 12 (MMP-12) protein levels.
• LPS decreased ADAM-10 gene expression but increased its secretion and the expression of MMP-12, TNF-α, iNOS, IL-10, and cyclinD1.
• ADAM-10 knockdown decreased macrophage viability and expression of MMP-12, iNOS, TNF-α, IL-1β, and FKN, while overexpression had opposite effects.
• Overexpression of ADAM-10 increased iNOS expression, driving IL-6 expression.

Conclusions:

• ADAM-10 is activated by LPS and plays a positive role in LPS-stimulated macrophage inflammatory responses.
• ADAM-10 positively regulates MMP-12 during the inflammatory process.
• ADAM-10 influences macrophage viability and the expression of key inflammatory mediators.