Adipose-Derived Stem Cells Alleviate Denervation-Induced Muscle Atrophy by Promoting M2 Macrophage Polarization and...

Area of Science:

• Regenerative Medicine
• Stem Cell Therapy
• Muscle Biology

Background:

• Denervation-induced muscle atrophy presents a significant therapeutic challenge.
• Adipose-derived stem cells (ADSCs) offer potential for tissue regeneration and repair.

Purpose of the Study:

• To evaluate the therapeutic effect of local ADSC delivery on denervated muscle.
• To investigate the underlying mechanisms of ADSC action in muscle regeneration.
• To track ADSC distribution and migration in vivo following local delivery.

Main Methods:

• Sciatic nerve transection and reverse autograft repair in a mouse model.
• Local injection of ADSCs or phosphate-buffered saline (PBS) into the gastrocnemius muscle.
• Assessment of muscle function, mass, histology, cellular markers (MyoD, CD163), and gene expression (RT-PCR).
• In vivo imaging (IVIS, MRI) for ADSC tracking.

Main Results:

• ADSC treatment significantly improved normalized muscle strength, gastrocnemius weight, and fiber diameter.
• ADSCs promoted muscle regeneration by upregulating MyoD and M2 macrophage markers (CD163, ARG1).
• ADSC therapy reduced pro-inflammatory gene expression (IL-6, IL-1b) and MMP2 expression.

Conclusions:

• Local ADSC delivery effectively ameliorates denervation-induced muscle atrophy.
• Therapeutic mechanisms involve enhanced muscle regeneration, M2 macrophage polarization, and reduced inflammation.
• ADSCs demonstrate significant potential for treating muscle loss after nerve injury.