Modulating SPARC expression in mesenchymal stem cells improves MSCs-mediated skin regeneration and wound repair

Area of Science:

• Regenerative Medicine
• Cell Biology
• Biochemistry

Background:

• Mesenchymal stem cells (MSCs) possess significant regenerative potential, largely via paracrine signaling involving soluble factors and extracellular vesicles (EVs).
• The MSC secretome influences key wound healing processes including inflammation, angiogenesis, and extracellular matrix (ECM) remodeling.
• Secreted Protein Acidic and Rich in Cysteine (SPARC), an ECM glycoprotein, is known to regulate tissue repair but its specific role in MSC regenerative capacity is unclear.

Purpose of the Study:

• To investigate the impact of SPARC expression on the regenerative properties of MSCs.
• To determine if SPARC overexpression enhances MSC-mediated wound healing.
• To explore SPARC's role in modulating MSC secretome efficacy.

Main Methods:

• Generation of SPARC-overexpressing (+SPARC) and SPARC-knockdown (KD-SPARC) MSCs using lentiviral systems.
• In vitro analysis of conditioned media (CM) from modified MSCs on human skin keratinocytes and fibroblasts.
• In vivo assessment of CM from +SPARC and KD-SPARC MSCs in a murine wound healing model.

Main Results:

• SPARC expression significantly influenced cell-specific migration and cell cycle progression in vitro.
• Conditioned media from +SPARC MSCs accelerated wound regeneration in vivo.
• Absence of SPARC in MSC-derived CM led to delayed wound healing.

Conclusions:

• SPARC plays a critical role in modulating MSC functionality and enhancing the regenerative capacity of their secretome.
• SPARC is a promising therapeutic target for developing advanced regenerative therapies for cutaneous wound healing.
• Modulating SPARC expression in MSCs can significantly improve wound healing outcomes.