A Combination of Distinct Vascular Stem/Progenitor Cells for Neovascularization and Ischemic Rescue

Area of Science:

• Regenerative Medicine
• Vascular Biology
• Stem Cell Research

Background:

• Peripheral vascular disease is a major global health concern, causing significant morbidity and mortality.
• Current treatments primarily focus on restoring blood flow to existing arteries.
• Enhancing new blood vessel growth (neovascularization) offers an alternative therapeutic strategy for ischemic conditions.

Purpose of the Study:

• To identify and characterize novel vascular stem/progenitor cells (VSPCs) capable of neovascularization.
• To investigate the potential of these VSPCs in treating ischemic diseases.

Main Methods:

• Utilized a reporter mouse model (ActinCreER/R26VT2/GK3 Rainbow) for unbiased in vivo screening.
• Employed prospective isolation and transplantation techniques to assess vessel-forming capacity.
• Applied single-cell RNA-sequencing to analyze distinct VSPC populations and their interactions.

Main Results:

• Identified two distinct VSPC populations (VSPC1 and VSPC2) from adipose-derived mesenchymal stromal cells.
• VSPC1 and VSPC2 individually formed incomplete vessels; however, their co-transplantation was essential for creating functional vessels.
• Co-transplantation of VSPC1 and VSPC2 significantly improved hindlimb perfusion in a mouse model of ischemia.
• Human adipose-derived VSPCs also demonstrated efficacy in rescuing ischemic conditions in mice.

Conclusions:

• Autologous co-transplantation of synergistic VSPCs from adipose tissue promotes effective neovascularization.
• This approach represents a promising therapeutic strategy for treating ischemic diseases.
• Adipose tissue serves as a readily accessible source of potent vascular stem cells for regenerative medicine.