Pentadecapeptide BPC 157 enhances the growth hormone receptor expression in tendon fibroblasts

This study conducted in Taiwan investigated the molecular mechanism by which BPC-157 promotes tendon healing, using human tendon fibroblasts in cell culture. The work focused specifically on the interaction between BPC-157 and the growth hormone (GH) signaling pathway, which had been little explored as a mechanism of action for this peptide.

The experiments demonstrated that BPC-157 significantly increased GH receptor (GHR) expression in tendon fibroblasts in a dose-dependent manner. Additionally, the peptide activated the JAK2/STAT3 signaling cascade — the main intracellular pathway of the GH receptor — resulting in increased STAT3 phosphorylation and transcription of target genes involved in cell proliferation and extracellular matrix synthesis.

Functionally, the BPC-157-mediated increase in GHR expression resulted in greater fibroblast sensitivity to circulating GH, amplifying the anabolic and reparative effects of this hormone in tendon tissue. Fibroblasts treated with BPC-157 showed higher proliferation rates and increased production of type I collagen, the main structural component of tendons.

This work was significant for proposing a concrete molecular mechanism for the tendon regenerative effects of BPC-157 observed in previous animal studies. The connection between BPC-157 and the GH/GHR/JAK2/STAT3 pathway suggests that the peptide potentiates endogenous repair mechanisms, which explains its efficacy in multiple tissues where GH plays a reparative role.