KPV: The Anti-Inflammatory Tail of α-MSH

KPV is a tripeptide — just three amino acids, Lysine-Proline-Valine — that corresponds to the C-terminal end (residues 11–13) of α-melanocyte-stimulating hormone (α-MSH). It is a compact example of a broader finding in peptide research: a small fragment of a larger hormone can retain part of the parent's activity while shedding the rest. The studies summarized here are preclinical and are presented for factual context only, with no therapeutic claims or dosage guidance.

Activity Without the Pigmentation

Full-length α-MSH is best known for stimulating melanin production through melanocortin-1 receptors. KPV is notable because it appears to carry forward the anti-inflammatory character of α-MSH while showing little of the pigmentary activity. Research has focused on how such a small peptide dampens inflammatory signaling.

A recurring mechanistic theme is interference with NF-κB, a master transcription factor for pro-inflammatory genes. In cell-based work, KPV has been associated with reduced NF-κB activation and lower downstream cytokine production — a signaling-level effect rather than a receptor-blockade one.

Intestinal Inflammation and the PepT1 Route

The most-cited KPV research comes from models of intestinal inflammation. Two 2008 studies are frequently referenced together:

  • Kannengiesser and colleagues reported that the melanocortin-derived tripeptide KPV had anti-inflammatory potential in murine models of inflammatory bowel disease (Kannengiesser K, Maaser C, et al. Inflamm Bowel Dis. 2008;14(3):324-331).
  • Dalmasso and colleagues described a specific delivery mechanism: KPV is taken up by intestinal cells through the PepT1 di/tripeptide transporter, and this uptake was associated with reduced intestinal inflammation (Dalmasso G, Charrier-Hisamuddin L, et al. "PepT1-mediated tripeptide KPV uptake reduces intestinal inflammation." Gastroenterology. 2008;134(1):166-178).
Why PepT1 is interesting: PepT1 is a transporter that normally absorbs dietary di- and tripeptides. Because KPV is a tripeptide, it can effectively "borrow" this route into epithelial and immune cells — a delivery characteristic that larger peptides do not share.

Part of the Melanocortin Peptide Class

KPV is best understood as one member of a broader class of α-MSH-derived peptides studied for immunomodulatory activity. A review by Luger and Brzoska placed these small melanocortin fragments in the context of anti-inflammatory and immunomodulating research (Luger TA, Brzoska T. "alpha-MSH related peptides: a new class of anti-inflammatory and immunomodulating drugs." Ann Rheum Dis. 2007;66(Suppl 3):iii52-iii55). The through-line across this class is anti-inflammatory signaling that appears largely independent of the pigmentary melanocortin pathway.

The KPV literature is predominantly preclinical — cell culture and animal models. Findings have not been established as clinical outcomes, and this summary should be read as a review of exploratory research.

Molecular Reference & Research Status

PropertyValue
SequenceLys-Pro-Val (KPV)
Identityα-MSH C-terminal fragment (11–13), free acid
Molecular formulaC₁₆H₃₀N₄O₄
Molecular weight342.43 Da
CAS number67727-97-3

A note on nomenclature: some suppliers use the same CAS number for a C-terminal amide form (Lys-Pro-Val-NH₂), which is a chemically distinct molecule with a different formula and mass. The values above are for the free-acid tripeptide. This compound is for in vitro and preclinical laboratory research only and is not intended for human use.