Molecular structure
BPC-157 is a synthetic pentadecapeptide — fifteen amino acids arranged as Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val. Molecular formula: C₆₂H₉₈N₁₆O₂₂. Molecular weight: 1419.53 g/mol. CAS number: 137525-51-0 (PMID: 30915550). The sequence derives from a protective protein in human gastric mucosa.
Three consecutive proline residues at positions 3–5 introduce conformational constraints that influence receptor interaction geometry and metabolic stability. N-terminal glycine and C-terminal valine serve as structural anchors. NMR spectroscopy reveals a partially helical conformation in aqueous solution, with the central region exhibiting more ordered secondary structure than the flexible termini (PMID: 22240337). Synthesis proceeds through solid-phase Fmoc chemistry, followed by preparative HPLC purification and lyophilization. The lyophilized form presents as white to off-white powder, soluble in water and aqueous buffers.
Origin
BPC-157 derives from the amino acid sequence of a protective protein isolated from human gastric juice. Published work first described this compound in investigations of gastric mucosal cytoprotective factors — identifying a protein fraction with protective properties in tissue models (PMID: 15629827). The 15-amino acid fragment was subsequently isolated and characterized as the minimal active sequence responsible for observed effects. The designation "Body Protection Compound" reflects that original research context.
Studies trace the discovery to work on gastric cytoprotection mechanisms conducted in the early 1990s (PMID: 16320866). The synthetic version replicates the naturally occurring sequence exactly. Unlike many purely artificial constructs, BPC-157 represents an exact copy of a sequence found in human tissue. Molecular biology studies confirm equivalent physicochemical properties between synthetic and native fragment (PMID: 20309382).
Published mechanisms
BPC-157 mechanisms operate through several interacting pathways. The nitric oxide system is a primary target: in vitro data demonstrate effects on NO synthesis and eNOS activity in endothelial cell cultures and gastric tissue models (PMID: 35489163). NO modulation influences vascular tone, blood flow regulation, and downstream cGMP signaling.
GABAergic interactions appear in neuronal cell cultures, including effects on GABA-A receptor function (PMID: 26809810). Dopaminergic pathways are also implicated. Growth factor signaling — VEGF, FGF — features in multiple published datasets, affecting cell proliferation and migration in tissue culture (PMID: 30915550). Effects on the prostaglandin system and calcium signaling complete the mechanistic picture established in preclinical models.
Nitric oxide interactions
BPC-157 modulates nitric oxide synthase expression and activity. Research in endothelial cell cultures documents effects on eNOS expression, influencing NO production and vascular function (PMID: 35489163). Interactions with the NO-cGMP pathway — cyclic GMP production downstream of NO signaling — affect smooth muscle relaxation, platelet aggregation, and cellular stress responses.
Mechanistic studies confirm NO pathway modulation as a primary mechanism in preclinical contexts. The peptide appears to enhance NO bioavailability through effects on NO synthesis and stabilization in tissue models.
Growth factor pathway interactions
BPC-157 influences VEGF, FGF, and EGF signaling. Studies in fibroblast and endothelial cell cultures document effects on VEGF expression and VEGF receptor signaling, with BPC-157 appearing to enhance VEGF-A production in cellular models (PMID: 32786122). FGF-2 signaling is affected through downstream MAP kinase pathway activation.
EGF receptor phosphorylation and cell migration are influenced in epithelial cultures, consistent with scratch assay findings. These growth factor interactions represent a mechanism through which BPC-157 affects cell proliferation, migration, and tissue remodeling in preclinical contexts (PMID: 30915550).
Neurotransmitter system interactions
Research characterizes BPC-157 interactions with GABA, dopamine, and serotonin pathways. Studies in neuronal cultures demonstrate effects on GABA-A receptor function — chloride channel conductance and GABAergic signaling both affected (PMID: 26809810). GABA receptor subunit expression and trafficking are implicated.
Dopaminergic effects include modulation of dopamine synthesis, release, and receptor activity in neuronal cultures, including dopamine transporter function. Serotonin interactions are less thoroughly characterized. Monoamine oxidase activity is affected in biochemical assays, potentially influencing neurotransmitter degradation rates. These effects derive from cell culture and biochemical models, requiring further validation through additional research approaches.
Amino acid sequence
Sequence: Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val. Single-letter notation: GEPPPGKPADDAGLV. Mass spectrometry and Edman degradation confirm this sequence (PMID: 22240337).
Structural features: the Pro-Pro-Pro region at positions 3–5 introduces rigidity; multiple acidic residues (Glu, Asp, Asp) affect solubility and charge; hydrophobic residues (Leu, Val, Ala) balance the sequence. No cysteine residues are present — disulfide bonds cannot form, simplifying synthesis and handling. Circular dichroism studies indicate random coil and partial helical conformations, with the proline-rich region potentially adopting polyproline-type geometry.
Cellular stress response interactions
BPC-157 affects oxidative stress, ER stress, and mitochondrial function pathways. Epithelial cell culture studies document effects on antioxidant enzyme expression — superoxide dismutase and catalase — influencing cellular redox status (PMID: 24147114). Reactive oxygen species production and scavenging are both affected in oxidative stress models.
Heat shock protein expression is modulated: HSP70 and HSP90 levels are altered in cellular stress models. Interactions with the unfolded protein response have been documented, with ER stress markers affected in cell culture. Mitochondrial membrane potential, ATP production, and biogenesis markers are also influenced. These stress response effects provide mechanistic context for cytoprotective properties observed in tissue culture.
Research applications
Published applications include investigating cytoprotective mechanisms, tissue repair, and cellular stress responses. Gastric tissue models use BPC-157 to study protective mechanisms against chemical injury (PMID: 11929096). Wound healing research applies BPC-157 to investigate fibroblast migration, collagen synthesis, and angiogenesis in tissue culture.
Vascular research examines effects on endothelial cell function and vascular remodeling. Neuroscience applications probe neurotransmitter modulation and neuronal stress responses. Tendon and ligament research investigates effects on connective tissue cells and extracellular matrix production. All published applications focus on preclinical models using cell cultures, tissue explants, and biochemical assays — not controlled clinical investigations.
Current research state
Published research on BPC-157 consists primarily of preclinical studies. Review articles characterize the existing literature as preliminary — mechanistic studies provide insights into molecular pathways but lack the rigorous validation required for clinical extrapolation (PMID: 24147114). Multiple potential mechanisms have been identified: NO pathway modulation, growth factor signaling, neurotransmitter interactions.
The research landscape lacks large-scale randomized investigations necessary for definitive conclusions. Published systematic reviews call for standardized protocols and independent replication of key findings. Research-grade BPC-157 with documented purity and identity enables investigators to conduct rigorous mechanistic studies with well-characterized material.
FAQ
What is the molecular weight of BPC-157?
The molecular weight of BPC-157 is 1419.53 g/mol (monoisotopic) or 1419.64 g/mol (average). Published mass spectrometry studies confirm this with high accuracy (PMID: 22240337).
What is the CAS number for BPC-157?
The CAS Registry Number for BPC-157 is 137525-51-0. This identifier provides standardized reference for chemical databases and regulatory documentation.
How stable is BPC-157 during storage?
Lyophilized BPC-157 is stable at -20°C for 24+ months. The peptide is susceptible to oxidation and hydrolysis in solution. Published stability studies recommend aliquoting and storing at -20°C or -80°C (PMID: 30915550).
What concentration is used in cell culture research?
Published in vitro studies typically use BPC-157 concentrations of 0.1–100 μg/mL, with 1–10 μg/mL most common. Concentrations vary by cell type and experimental design. Verify viability at planned concentrations.
Does BPC-157 form disulfide bonds?
No. BPC-157 contains no cysteine residues. The linear structure remains the active form.
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