Microvesicle-Mediated Tissue Regeneration Mitigates the Effects of Cellular Ageing

Area of Science:

• Cell Biology
• Regenerative Medicine
• Aging Research

Background:

• Extracellular vesicles (EVs), including microvesicles (MVs) and exosomes (Exos), are crucial for intercellular communication and tissue repair.
• The role of EVs in cellular aging and stress responses remains largely uncharacterized.
• Pathfinder cells (PCs) are a novel cell type implicated in stem cell regulation.

Purpose of the Study:

• To investigate the therapeutic potential of MVs from PCs in repairing aged cells under various stress conditions.
• To determine the specificity of MV action concerning cell type, cellular age, and stress type.
• To explore the senotherapeutic effects of MVs in a model of comorbidity.

Main Methods:

• Co-culture systems involving human dermal fibroblasts (HDFs), mesenchymal stem cells (MSCs), and vascular smooth muscle cells (VSMCs) of varying ages.
• Application of mechanical and genotoxic stress to co-cultures.
• Administration of MVs derived from PCs.
• Assessment of cellular repair and senotherapeutic effects.

Main Results:

• PCs-derived MVs enhanced repair in younger HDF and MSC co-cultures following mechanical and genotoxic stress.
• MV efficacy was cellular age and stress-dependent; mechanical injury repair failed in older co-cultures, but genotoxic stress repair remained effective.
• MVs demonstrated senotherapeutic effects in co-cultures of HDFs and senescent abdominal aortic aneurysm (AAA) VSMCs, mitigating damage from both stress types.

Conclusions:

• PCs-derived MVs possess distinct therapeutic properties for tissue repair, with efficacy modulated by cellular age and stress type.
• MV treatment shows promise as a senotherapeutic intervention, particularly in complex age-related conditions.
• These findings support the development of cell-free therapies using MVs to address age-associated tissue damage and morbidities.