Injectable skeletal muscle constructs overexpressing GLUT4 for type 2 diabetes intervention

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Metabolic Disease Research

Background:

• Skeletal muscle tissue engineering faces challenges with large constructs and invasive implantation.
• Injectable scaffolds are emerging, but skeletal muscle fabrication is complex due to myotube size and mechanical needs.
• Type 2 diabetes is marked by reduced GLUT4 expression and translocation in skeletal muscle, impairing glucose regulation.

Purpose of the Study:

• To develop an injectable, shape-memory collagen scaffold for skeletal muscle tissue engineering.
• To create GLUT4-overexpressing muscle constructs for potential Type 2 diabetes treatment.
• To demonstrate minimally invasive delivery and in vivo efficacy of engineered muscle tissue.

Main Methods:

• Fabrication of a collagen-based shape-memory scaffold.
• Development of injectable, GLUT4-overexpressing skeletal muscle constructs.
• Intramuscular delivery via syringe needle and in vivo assessment in a Type 2 diabetes mouse model.

Main Results:

• The injectable scaffold maintained shape post-injection and supported muscle growth and differentiation in vitro.
• Engineered muscle constructs integrated successfully with native muscle tissue.
• GLUT4-overexpressing constructs improved glucose homeostasis in diabetic mice, retaining viability and shape-memory properties.

Conclusions:

• Minimally invasive delivery of engineered skeletal muscle tissue is feasible using shape-memory scaffolds.
• Injectable GLUT4-overexpressing muscle constructs show potential for treating Type 2 diabetes by improving glucose regulation.
• This approach advances regenerative medicine for chronic metabolic disorders requiring enhanced muscle function.