Urine-derived stem cells genetically modified with IGF1 improve muscle regeneration

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Skeletal Muscle Physiology

Background:

• Skeletal muscle injuries require effective regenerative therapies.
• Human urine-derived stem cells (USC) show potential for tissue repair.
• Modulating stem cell function can enhance regenerative capacity.

Purpose of the Study:

• To investigate the impact of IGF1-overexpressing USC (USC^IGF1) on skeletal muscle regeneration.
• To compare the efficacy of USC^IGF1 against unmodified USC in a cardiotoxin-induced injury model.
• To elucidate the mechanisms underlying USC^IGF1-mediated muscle repair.

Main Methods:

• Overexpression of Insulin-like Growth Factor 1 (IGF1) in USC.
• In vitro assessment of myogenic differentiation and growth factor secretion.
• In vivo evaluation of skeletal muscle regeneration in cardiotoxin-injured mice.

Main Results:

• USC^IGF1 activated the IGF1-Akt-mTOR pathway, enhancing myogenic differentiation in vitro.
• IGF1 overexpression boosted USC fusion with myocytes and modulated immune and inflammatory responses.
• Significant improvement in myogenesis and skeletal muscle regeneration was observed in vivo.

Conclusions:

• IGF1-modified USC markedly enhance skeletal muscle regeneration through improved differentiation, paracrine signaling, cell fusion, and immune modulation.
• USC represent a viable non-myogenic cell source for skeletal myogenesis.
• USC^IGF1 offers a promising therapeutic strategy for skeletal muscle injuries and related conditions.