BPC-157

BPC-157 is a synthetic pentadecapeptide derived from a protective protein found in human gastric juice. It consists of 15 amino acids and is notable for its stability in gastric acid, a property uncommon among peptides of its size. Research interest centers on its cytoprotective effects across multiple organ systems, including the gastrointestinal tract, musculoskeletal tissues, and the central nervous system.

Unlike many bioactive peptides, BPC-157 has no known natural counterpart at its specific sequence length. It was originally isolated as a fragment of a larger gastric protein and has been studied primarily by research groups at the University of Zagreb. It remains an investigational compound with no regulatory approval for clinical use.

BPC-157 exerts its effects through multiple interconnected pathways. It modulates the nitric oxide (NO) system, interacting with both the constitutive and inducible NO synthase pathways to influence vascular tone, inflammation, and tissue repair. The peptide also upregulates growth hormone receptor expression in fibroblasts, which may partly explain its observed effects on tendon and ligament healing in animal models.

At the cellular level, BPC-157 promotes angiogenesis through upregulation of VEGFR2 and the FAK-paxillin signaling pathway. It also stabilizes the endothelial barrier, reduces pro-inflammatory cytokine production, and interacts with the dopaminergic and serotonergic systems. Its engagement with the brain-gut axis suggests a bidirectional influence on both enteric and central nervous system function, though these mechanisms remain incompletely characterized.