Local Hypertrophy and Rapid Skeletal Muscle Mass Atrophy Reversal with MGF

Professional Title: "Local Expression of Mechano-Growth Factor (IGF-1Ec) Induces Hypertrophic Remodeling and Significant Mass Expansion in Mature Skeletal Muscle"

Journal Context: The Journal of Physiology / PubMed | Identifiers: DOI: 10.1113/jphysiol.2001.012824 / PMID: 11826160

Principal Investigators: Goldspink, G., Yang, S. Y., Al7-Rabban, S., McKoy, G., et al. (Royal Free and University College Medical School, London)

Methodology: Longitudinal evaluation of adult murine models where a cDNA plasmid encoding MGF was directly introduced via localized intramuscular injection into the tibialis anterior muscle. Tissues were histologically staged after a brief 2-week observation cycle to measure cross-sectional fiber areas and total muscle weight changes.

Key Findings: Localized administration of MGF resulted in a striking $25\%$ increase in mean muscle fiber cross-sectional area and an overall $20\%$ increase in total wet muscle mass within a brief 14-day window. The rapid hypertrophic expansion occurred without altering systemic blood chemistry or inducing systemic side effects, confirming MGF as a highly potent, purely localized autocrine/paracrine driver of muscle tissue growth.