Effective therapy of transected quadriceps muscle in rat: Gastric pentadecapeptide BPC 157

Summary

This is an animal study in rats. Researchers from the University of Zagreb completely transected the quadriceps muscle 1.0 cm above the patella, a defect the authors describe as one the rat cannot compensate for, and then treated the animals with the stable gastric pentadecapeptide BPC 157 given systemically. The authors report that BPC 157 promptly induced healing and then maintained it, with functional restoration, throughout the 72-day study period.

Key Findings

• BPC 157 consistently improved muscle healing throughout the whole 72-day period
• Biomechanics: load to failure increased
• Function: walking recovery and the extensor postural thrust / motor function index returned toward normal healthy values
• Microscopy and immunochemistry: muscle fibers mostly connected the muscle segments with no gap, significant desmin positivity indicated ongoing muscle regeneration, and myofibril diameters on both the distal and proximal sides reached normal healthy rat values
• Macroscopic appearance: the stumps were connected, atrophy was markedly attenuated, the muscle eventually looked close to normal uninjured muscle, and there was no post-surgery leg contracture
• The authors suggest the results point to a possible therapeutic use of the peptide in muscle disorders

Methodology

Rats underwent complete transverse transection of the quadriceps muscle 1.0 cm proximal to the patella. BPC 157 was given intraperitoneally once daily at 10 µg/kg, 10 ng/kg or 10 pg/kg, with the first dose 30 minutes after transection and the last dose 24 hours before sacrifice. Outcomes were biomechanical (load of failure), functional (walking recovery, extensor postural thrust / motor function index), microscopic and immunochemical (including desmin staining and myofibril diameter), and macroscopic.

Limitations

• Rat model only; results have not been shown in humans
• Complete surgical transection is a severe, standardized injury and may not reflect common human muscle strains or tears
• Intraperitoneal doses in rats do not translate directly to human dosing
• The abstract does not report group sizes
• Conducted by a single research group (University of Zagreb); independent replication would strengthen the findings

Relevance to Content

Primary evidence for claims that BPC-157 speeds muscle healing. Useful for content on muscle injury and recovery, provided it is framed as a rat study with a severe surgical injury model rather than evidence of benefit in people.

See Also

• Parent compound: BPC-157