KPV is a tripeptide made of lysine, proline and valine that corresponds to the C-terminal end of alpha-melanocyte-stimulating hormone (alpha-MSH). Researchers use it to study how a very small fragment of a larger melanocortin peptide behaves in preclinical models of inflammation, particularly in the gut and skin. This guide covers what KPV is, the mechanisms that have been investigated, how it is handled in the lab and how to check batch quality.
What is KPV?
KPV (Lys-Pro-Val) is made up of the final three amino acids of alpha-MSH, a 13-residue peptide produced from the precursor protein pro-opiomelanocortin (POMC). Alpha-MSH is best known for its role in pigmentation through the melanocortin 1 receptor, but it has also been studied extensively for its effects on immune signaling. Work on alpha-MSH fragments suggested that part of the anti-inflammatory activity seen with the full hormone in certain experimental models could be reproduced by the C-terminal tripeptide alone, which made KPV an object of study in its own right.
Because it is only three residues long, KPV is one of the smallest bioactive peptides studied in this field. Its small size makes it straightforward to synthesize and characterize, and it has drawn particular interest from groups looking at how short peptides cross epithelial barriers. In the literature it may appear as KPV peptide, Lys-Pro-Val, or alpha-MSH (11-13), after its position in the parent sequence.
KPV is a research compound. It is not an approved medicine in the United States, and the material PRIME supplies is sold strictly for laboratory research use.
How KPV works: mechanism studied in research
The mechanism of KPV is still being worked out, and published findings do not all point in the same direction. Several lines of investigation stand out.
Inflammatory signaling
In cell culture models, KPV has been studied for its effect on the NF-kB pathway, a central switch that controls the expression of many pro-inflammatory genes. Researchers have observed reduced NF-kB activation and lower expression of inflammatory cytokines in epithelial and immune cells exposed to KPV under inflammatory stimulation. MAPK signaling has also been examined in some of this work.
Melanocortin receptors
Because KPV comes from alpha-MSH, a natural question is whether it acts through melanocortin receptors. The answer appears to be model-dependent. Some studies suggest that its anti-inflammatory activity may occur at least partly independently of classic melanocortin receptor signaling, while others have explored receptor involvement. The extent to which KPV relies on these receptors remains an open research question.
Peptide transport and uptake
A distinctive feature of KPV research is its relationship with PepT1, a transporter that moves di- and tripeptides into cells. PepT1 is expressed in the intestinal epithelium and its expression has been reported to change during intestinal inflammation. Researchers have investigated PepT1 as a route by which KPV enters intestinal epithelial cells and immune cells, and some groups have tested nanoparticle and other delivery systems designed to carry KPV to the colon in rodent models.
Areas of research
KPV has been investigated mainly in preclinical settings. Common research themes include:
- Intestinal inflammation, including rodent models of experimental colitis
- Epithelial barrier function and the behavior of intestinal epithelial cells under inflammatory stress
- Skin inflammation and wound environment models
- NF-kB and cytokine signaling in cultured immune and epithelial cells
- PepT1-mediated transport of short peptides
- Targeted delivery systems, such as nanoparticles and hydrogels, used to carry small peptides to specific tissues
- Structure-activity work comparing KPV with alpha-MSH and other melanocortin fragments
Most of this work is at the cell culture and animal model stage. Findings from these models should not be read as evidence of any effect in people.
Key facts table
| Property | KPV |
|---|---|
| Class | Short peptide; melanocortin-derived fragment |
| Sequence | Lys-Pro-Val (KPV) |
| Origin | C-terminal tripeptide of alpha-MSH (residues 11-13) |
| Parent precursor | Pro-opiomelanocortin (POMC) |
| Form supplied | Lyophilized powder in a sealed vial |
| Research status | Research compound; not an approved medicine in the US |
| Main research topics | Inflammatory signaling, intestinal models, peptide transport |
| Storage | Cold, dry and protected from light; refrigerate after reconstitution |
Handling and storage in the lab
KPV is supplied as a lyophilized (freeze-dried) powder, which is the most stable form for shipping and storage. General laboratory practice for peptides of this kind applies:
- Before reconstitution: keep vials sealed, cold and dry. For longer storage, freezer conditions are commonly used. Allow the vial to reach room temperature before opening to limit condensation.
- Reconstitution: labs typically reconstitute with bacteriostatic water or another sterile diluent chosen for the experimental protocol. Add the diluent slowly down the side of the vial and swirl gently rather than shaking.
- After reconstitution: store the solution refrigerated and protected from light. Label each vial with the date and concentration used by the lab.
- Aliquoting: dividing a solution into single-use aliquots helps avoid repeated freeze-thaw cycles, which can degrade peptides.
- Documentation: record the lot number from the vial so results can be traced back to a specific batch and its lab report.
These are general handling notes for laboratory material only. They are not instructions for any form of personal use.
Quality and lab results
For a short peptide like KPV, identity and purity matter because small impurities or truncated sequences can confound results. Every PRIME batch is tested by an independent laboratory, and the certificate of analysis for each batch is published on our lab results page. Match the lot number on your vial to its report before starting work, and keep a copy with your lab records. You can find the research material itself on the KPV product page.
Related research
KPV is often studied alongside other peptides investigated in tissue and inflammation models. For a side-by-side look at two compounds researchers frequently compare, see BPC-157 vs KPV. You may also find the BPC-157 research guide and the GHK-Cu research guide useful for broader context on peptides studied in repair and inflammation research.
FAQ
What is KPV peptide?
KPV is a tripeptide with the sequence lysine-proline-valine. It is the C-terminal fragment of alpha-MSH and is studied in preclinical models of inflammation, especially intestinal inflammation.
Is KPV the same as alpha-MSH?
No. Alpha-MSH is a 13-amino-acid hormone, while KPV is only its last three residues. Researchers study KPV to see which activities of the full hormone can be reproduced by this small fragment, and it has not been shown to share alpha-MSH's pigmentation role.
Is KPV FDA approved?
No. KPV is a research compound and is not an approved medicine in the United States. PRIME supplies it for laboratory research use only.
How is KPV different from BPC-157?
KPV is a three-residue fragment of alpha-MSH studied mainly for inflammatory signaling, while BPC-157 is a longer synthetic peptide studied mainly in tissue repair models. They are separate compounds with different research histories.
How should KPV be stored in the lab?
Keep lyophilized vials sealed, cold, dry and away from light. After reconstitution, store the solution refrigerated and avoid repeated freeze-thaw cycles.
For laboratory research use only. Not for human consumption. Not a drug, food or cosmetic.