In-vitro and preclinical literature on BPC-157, TB-500, GHK-Cu and KPV: mechanisms, model systems and 20 PubMed-linked references.
✔ PubMed-linked citations ✔ In-vitro and preclinical only ✔ Research Use Only
Tissue-repair peptides are short synthetic peptides whose sequences are derived from, or identical to, endogenous fragments studied in models of wound closure, angiogenesis, extracellular-matrix remodeling and inflammation resolution. The compounds in this class (BPC-157, thymosin beta-4/TB-500, GHK-Cu and KPV) act through distinct mechanisms: nitric oxide and growth-factor-receptor signalling, G-actin sequestration and cell migration, copper-dependent modulation of gene expression, and melanocortin-related anti-inflammatory signalling, respectively. The literature is dominated by rodent injury models (tendon, skin, muscle, gastrointestinal, myocardial), ex vivo explants and cultured fibroblast, keratinocyte, endothelial and epithelial cell lines, together with mechanistic reviews. Human clinical data are sparse or absent for most of these peptides, and the references collected here are restricted to in-vitro, preclinical and review literature.
This page collects 30 peer-reviewed references across 6 compounds. Every citation links to its PubMed record so the primary source can be read in full. The selection is limited to in-vitro, ex-vivo and preclinical animal studies and mechanistic reviews; human clinical literature is deliberately excluded because Liv Pure products are supplied for laboratory research only.
Also known as: Body Protection Compound-157; stable gastric pentadecapeptide; PL 14736; sequence GEPPPGKPADDAGLV (15 amino acids, MW ~1419)
Molecular target or pathway: Nitric oxide (NO) system interaction (eNOS, L-NAME/L-arginine responsive); VEGFR2 and FAK-paxillin signalling; modulation of eNOS and COX2 gene expression reported in rat models; no single high-affinity receptor established
Origin: Synthetic pentadecapeptide corresponding to a partial sequence of a protein originally isolated from human gastric juice
BPC-157 has been studied extensively in rat models of gastrointestinal, tendon, ligament, muscle, vascular and nervous-system injury, largely by a single research group at the University of Zagreb. In vitro work includes rat tendon explant outgrowth, tendon fibroblast migration and survival assays, and membrane-potential measurements in HEK293 cells. Reviews summarize proposed interactions with the nitric oxide system, angiogenic growth-factor pathways and endothelial protection; the literature is predominantly preclinical, and the references below are restricted to that subset.
Liv Pure supplies BPC-157 as a lyophilized research reagent with a lot-specific certificate of analysis.
Selected references
Also known as: Thymosin beta-4 (Tβ4); TB4; synthetic full-length thymosin beta-4 (43 amino acids, MW ~4963; the actin-binding motif LKKTETQ occupies residues 17-23)
Molecular target or pathway: G-actin sequestration (micromolar-affinity monomeric actin binding); regulation of the SRF-MRTF-G-actin transcriptional pathway; endothelial and keratinocyte chemotaxis; matrix metalloproteinase production
Origin: Endogenous 43-residue peptide present in most vertebrate cells and released by platelets; TB-500 is the synthetic full-length peptide
Thymosin beta-4 is the major intracellular G-actin-sequestering peptide in vertebrate cells, and its extracellular activities have been examined in rat and mouse dermal wound models, HUVEC migration assays, Matrigel implants and models of cardiac and hepatic injury. Research-grade TB-500 is the synthetic full-length peptide, so the mechanistic literature on thymosin beta-4 applies directly. Reviews note that the molecular mechanisms of extracellular beta-thymosins remain incompletely defined.
Liv Pure supplies TB-500 (thymosin beta-4) as a lyophilized research reagent with a lot-specific certificate of analysis.
Selected references
Also known as: Copper tripeptide-1; glycyl-L-histidyl-L-lysine copper(II) complex; GHK; Gly-His-Lys; prezatide copper
Molecular target or pathway: High-affinity Cu(II) chelation (albumin-like copper transport site); modulation of gene expression including collagen, decorin, metalloproteinases and their inhibitors, NF-kB-related and antioxidant genes; integrin expression in keratinocytes; TGF-beta1 secretion in fibroblasts
Origin: Endogenous tripeptide present in human plasma, saliva and urine (originally isolated from human albumin fractions); supplied as a synthetic peptide-copper complex
GHK is a naturally occurring copper-binding tripeptide whose plasma level declines with age; in complex with copper it has been studied in fibroblast, keratinocyte and skin-equivalent cultures, in ex vivo human skin penetration assays, and in rodent, pig and dog wound models. Connectivity Map gene-profiling studies attribute a broad transcriptional footprint to GHK, including collagen, glycosaminoglycan and remodeling genes. Much of the review literature comes from a single author group, and the references below combine those reviews with independent cell-culture studies.
Liv Pure supplies GHK-Cu as a lyophilized research reagent with a lot-specific certificate of analysis.
Selected references
Also known as: Lys-Pro-Val; α-MSH(11-13); C-terminal tripeptide of alpha-melanocyte-stimulating hormone
Molecular target or pathway: Melanocortin-related anti-inflammatory signalling with evidence of MC1R-independent activity; intracellular calcium mobilization in keratinocytes; NF-kB pathway modulation; cellular uptake via the oligopeptide transporter PepT1 in intestinal epithelial cells
Origin: Synthetic tripeptide corresponding to the C-terminal residues 11-13 of endogenous alpha-MSH
KPV is the C-terminal tripeptide of alpha-MSH and lacks the core sequence required for classical melanocortin-receptor binding, yet retains much of the parent hormone's anti-inflammatory activity in cell and animal models without pigmentary effects. It has been studied in HaCaT and normal human keratinocytes, MC1R-transfected CHO cells, Caco-2 and RAW 264.7 cells, and in mouse DSS and CD45RB(hi) transfer colitis models, including in MC1R-deficient mice. The precise signalling mechanism is described in reviews as not fully defined.
Liv Pure supplies KPV as a lyophilized research reagent with a lot-specific certificate of analysis.
Selected references
The published work relies heavily on rat and mouse injury models (Achilles tendon transection, full-thickness dermal wounds, DSS colitis, isoprenaline myocardial injury), ex vivo tendon explant outgrowth assays, and monolayer or Boyden-chamber assays using fibroblasts, keratinocytes (HaCaT, normal human keratinocytes), HUVEC endothelial cells, Caco-2 and RAW 264.7 cells. Readouts typically include cell migration, proliferation, collagen deposition, angiogenesis markers, cytokine levels and gene-expression profiling.
Lyophilized peptides are generally stored desiccated at -20 °C or below and protected from light and moisture; reconstituted solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles. GHK-Cu is a copper complex and can be sensitive to chelators and pH; BPC-157 is reported to be stable in acidic gastric-juice conditions in the primary literature. Researchers should consult the certificate of analysis for each lot and verify identity and purity (e.g. HPLC, mass spectrometry) before use in assays.
For most compounds in this class there are few or no controlled human studies, and much of the BPC-157 and GHK literature originates from a small number of research groups. Receptor-level pharmacology is incompletely characterized (for example, the molecular target of extracellular thymosin beta-4 and the receptor-independent signalling of KPV remain open questions).
All compounds referenced on this page are supplied by Liv Pure for in-vitro laboratory research only and are not for human or animal use. Nothing on this page is medical advice, and no statement here has been evaluated by the Food and Drug Administration. Product identity and purity for each lot are documented on the certificate of analysis; our Testing and Quality page explains what those certificates do and do not measure. Browse the Tissue-Repair Peptides category to see current lots.
Liv Pure supplies research-grade synthetic peptides and laboratory reagents to qualified researchers and institutions. Every lot ships with a lot-specific certificate of analysis.
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