iPS cell sheets created by a novel magnetite tissue engineering method for reparative angiogenesis

Area of Science:

• Regenerative Medicine
• Vascular Biology
• Biomaterials Engineering

Background:

• Angiogenic cell therapy offers a potential treatment for ischemic diseases.
• Patient responses to current angiogenic cell therapies can be variable.
• There is a need for improved methods to enhance therapeutic angiogenesis.

Purpose of the Study:

• To investigate the therapeutic potential of induced pluripotent stem (iPS) cell sheets for reparative angiogenesis.
• To develop and evaluate a novel magnetite tissue engineering technology (Mag-TE) for creating iPS cell sheets.

Main Methods:

• Mouse iPS cell-derived Flk-1(+) cells were labeled with magnetic nanoparticle-containing liposomes (MCLs).
• MCL-labeled cells were combined with extracellular matrix (ECM) precursors and subjected to magnetic force to form multi-layered cell sheets.
• The therapeutic efficacy of the iPS cell sheets was assessed in a mouse model of ischemic hindlimb.

Main Results:

• Implantation of the iPS cell sheet significantly accelerated revascularization in ischemic hindlimbs.
• Laser Doppler blood flow and capillary density analyses confirmed enhanced blood vessel formation.
• Increased expression of vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) was observed in ischemic tissues.

Conclusions:

• iPS cell-derived Flk-1(+) cell sheets fabricated using the Mag-TE method represent a promising new approach for therapeutic angiogenesis.
• This novel cell sheet technology holds potential for treating ischemic diseases by promoting vascular repair.