Has KPV been tested in humans?

No established clinical programme exists. The literature is cell culture and murine models.

Does the colitis result mean it treats IBD?

No. Induced colitis in a mouse is an acute chemical model; human inflammatory bowel disease is chronic and immunologically complex.

KPV

What the Colitis Models Reported

JMWritten & reviewed by Jack Muncaster · Founder, UK PeptidesLast reviewed 2026-08-232 cited sources

Kannengiesser and colleagues reported that the melanocortin-derived tripeptide KPV has anti-inflammatory potential in murine colitis models, published in Inflammatory Bowel Disease in 2008. It is a mouse disease model, and the distance from there to a clinical claim is substantial.

Key facts

Publication: Inflamm Bowel Dis, March 2008
PMID: 18092346
Model organism: Mouse
Model type: Induced colitis
Reported: Anti-inflammatory potential
Human trials: None established

Why colitis models are used

Induced colitis in mice is a standard model for intestinal inflammation, producing measurable tissue damage and inflammatory marker changes on a workable timescale. It is a well-established system with objective endpoints, which makes it a reasonable place to test an anti-inflammatory hypothesis.

What the study reported

Anti-inflammatory potential for KPV in that model. The paper's own language — potential — is worth preserving, because it is more careful than the language that usually gets applied to it downstream. A compound showing an effect in an induced disease model has demonstrated something in that model.

Research material referenced

KPV 10mg — third-party HPLC tested

View — £24.99

The gap between a model and a condition

Induced colitis in a mouse is not inflammatory bowel disease in a person. The induction is chemical and acute; human IBD is chronic, immunologically complex and heterogeneous. Model systems are chosen because they are tractable, and tractability is bought by simplifying away much of what makes the human condition difficult.

Why the gut was a natural target

Beyond the disease relevance, the intestine is where an orally administered compound would first arrive. The later delivery work — targeting KPV to inflamed intestinal tissue with hyaluronic acid-functionalised carriers — follows directly from this line, and indicates the difficulty was getting enough compound to the right place rather than the compound lacking activity.

What is not claimed

Nothing about inflammatory bowel disease, inflammation or gut health in any person. There is no established human clinical programme for KPV, it holds no marketing authorisation, and material supplied for laboratory research is not related to any therapeutic use.

Extended research context

The KPV deep dive

Deep dive: two functions in one hormone, and the case for splitting them

Alpha-MSH is a thirteen-residue peptide cleaved from proopiomelanocortin, and it does two things that have almost nothing to do with each other. Its core sequence engages melanocortin receptors on melanocytes and drives melanin synthesis - the activity it is named for. Separately, it carries anti-inflammatory activity that Brzoska and colleagues localised to its C-terminal end, a paper titled 'terminal signal' precisely because the finding was that the signal sits at the terminus rather than in the receptor-binding core. That is an unusually clean functional separation, and it produced two research compounds pulling in opposite directions from one parent. KPV takes the C-terminal three residues and discards the pigmentation activity. Melanotan II does the reverse - a cyclic analogue built around the receptor-binding portion to maximise exactly what KPV was designed to leave behind. Same hormone, opposite halves.

Deep dive: what happens when you shrink a molecule fivefold

Going from alpha-MSH at 1,664.9 Da to KPV at 342.43 Da is not a trim, it is a change of category. A 1,665 Da peptide is firmly a cell-surface ligand - far too large to cross a membrane passively, so whatever it does must begin at a receptor. A 342 Da tripeptide is small enough that intracellular access becomes plausible, which is why KPV's reported mechanism is described in terms of NF-kappaB signalling rather than melanocortin receptor engagement. The consequence is rarely stated: if the fragment acts inside the cell and the parent acts at its surface, then the anti-inflammatory activity of the two is not necessarily the same phenomenon, and read-across between them should run cautiously in both directions. Fragment logic assumes the fragment is the parent minus something. Here it may be the parent minus something plus a different route of access.

Deep dive: the delivery paper is the most informative thing in the literature

Xiao and colleagues published in Molecular Therapy in 2017 on delivering KPV orally using hyaluronic acid-functionalised nanoparticles targeted to inflamed intestinal tissue. Read as a result it is a delivery success. Read as a statement about the compound it is more interesting: nobody builds a targeted nanoparticle carrier for a molecule that already reaches its target. The existence of that work says the free tripeptide's arrival at inflamed tissue was the limiting problem - which follows directly from being 342 Da, highly soluble and rapidly cleared. It is the same signal that CJC-1295's DAC modification carries for growth hormone secretagogues, or that lipidation carries across the whole incretin class: when the engineering effort goes into getting a compound to stay and arrive rather than into making it more active, the pharmacokinetics were the bottleneck.

Research applications

▸Melanocortin fragment structure-activity research
▸NF-kappaB pathway and cytokine production studies in culture
▸Murine models of induced intestinal inflammation
▸Targeted peptide delivery and carrier system development
▸Comparative work on parent hormones and isolated fragments
▸Analytical method development for very short peptides

Handling checklist

✓Verify identity against Lys-Pro-Val, CID 125672, at 342.43 Da
✓Do not search PubChem for 'KPV' - it returns an unrelated organic acid
✓Store lyophilised, cold, dry and dark
✓Use low-binding consumables; a small cationic peptide adsorbs to surfaces
✓Reconstitute gently down the vial wall and swirl, never shake
✓Aliquot into single-use volumes to avoid freeze-thaw cycling
✓Expect no disulfide or oxidation satellites - no cysteine, no methionine

Common research-handling mistakes

Learnt from thousands of researcher orders across our UK labs.

✗ Searching PubChem for 'KPV' to verify a certificate

Fix: That returns CID 13294447, 2-oxo-5-phenylpentanoic acid at 192.21 Da, an unrelated compound. Search Lys-Pro-Val for CID 125672.

✗ Treating KPV and alpha-MSH findings as interchangeable

Fix: They differ fivefold in mass and the fragment may act intracellularly where the parent cannot. Read across cautiously in both directions.

✗ Assuming a colitis model result speaks to inflammatory bowel disease

Fix: Induced colitis in a mouse is acute and chemical; human IBD is chronic, heterogeneous and immunologically complex.

✗ Expecting to quantify KPV by absorbance at 280 nm

Fix: There is no aromatic residue in the sequence, so there is no usable absorbance there.

✗ Attributing unexplained low recovery to degradation

Fix: KPV is chemically robust - no cysteine, methionine or asparagine. Adsorption to glass and plastic is the more likely cause.

Continue researching

Peer-reviewed guides, comparators and matched reference materials.

Frequently asked questions

Has KPV been tested in humans?: No established clinical programme exists. The literature is cell culture and murine models.
Does the colitis result mean it treats IBD?: No. Induced colitis in a mouse is an acute chemical model; human inflammatory bowel disease is chronic and immunologically complex.
Why was the gut studied specifically?: It is both a disease-relevant tissue and where an orally administered compound would first arrive, which is why the later delivery work targets it.

Primary sources & clinical trials

Peer-reviewed research and registered trials from PubMed, ClinicalTrials.gov, PubChem, FDA and NIH. All links open in a new tab and point to the primary source, so every claim can be verified at origin.

Written and reviewed by

Jack Muncaster · Founder, UK Peptides

Jack founded UK Peptides in Manchester after repeatedly receiving research compounds with missing or recycled paperwork. He is responsible for supplier selection, batch release decisions and the content published in this research library. Every article here is sourced to primary literature and every product page to a signed third-party certificate.

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