Nanodevice-Mediated Immune Cell Recruitment: Targeting Senescent Cells via MMP-3-Responsive CXCL12-Coated...

Area of Science:

• Biomedical Engineering
• Immunology
• Cell Biology

Background:

• Senescent cells contribute to age-related disorders and fibrotic pathologies.
• Immune-modulating agents are emerging as therapeutic strategies for senescent cell elimination.
• Targeting the senescence-associated secretory phenotype is a key therapeutic goal.

Purpose of the Study:

• To design and evaluate a nanoparticle system for immune cell-mediated senolytic therapy.
• To recruit immune cells specifically in response to matrix metalloproteinase-3 (MMP-3) activity.
• To enhance the elimination of senescent cells by endogenous immune cells.

Main Methods:

• Mesoporous silica nanoparticles (MSNs) coated with an MMP-3 peptide substrate and decorated with chemokine CXCL12 (NPs@CXCL12).
• Controlled release studies to assess CXCL12 release kinetics in the presence of MMP-3.
• Transwell migration assays and microfluidic devices to evaluate immune cell (Jurkat T-cells, NK cells) recruitment and migration toward senescent cells.

Main Results:

• NPs@CXCL12 demonstrated progressive and specific release of CXCL12 in response to MMP-3.
• NPs@CXCL12 showed a 2-fold enhanced chemotaxis effect toward senescent cells compared to free CXCL12.
• NPs@CXCL12 effectively generated a chemotactic gradient attracting natural killer (NK) cells, with reduced migration toward free CXCL12 under competitive conditions.

Conclusions:

• The developed nanoparticle system (NPs@CXCL12) shows potential for targeted immune cell recruitment.
• This approach can enhance senescent cell elimination through immune cell-mediated senolytic therapy.
• The study highlights the promise of designing responsive nanoparticles for treating age-related and fibrotic diseases.