🔬 General ResearchPublished: August 19, 2026

KPV Tripeptide: Alpha-MSH Derivative, NF-κB Pathway Downregulation & Mucosal Healing

“KPV (Lys-Pro-Val) is a C-terminal tripeptide fragment of alpha-melanocyte-stimulating hormone (alpha-MSH) that enters cells via the PepT1 transporter, directly downregulating NF-kappaB nuclear translocation, reducing pro-inflammatory cytokine secretion, and restoring mucosal barrier integrity.”

Consult Analyst Research Database

Legal & Laboratory Compliance Notice

FOR IN-VITRO LABORATORY RESEARCH ONLY: This scientific publication is provided strictly for academic and biochemical reference by certified researchers. Materials and compounds referenced are NOT for human consumption, veterinary use, drug manufacture, or direct clinical administration. Statements have not been evaluated by Health Canada or the FDA.

Scientific Research Overview

Abstract & Executive Summary

Alpha-Melanocyte-Stimulating Hormone (alpha-MSH) is a classical 13-amino-acid neuro-immunomodulatory peptide. However, full-length alpha-MSH activates melanocortin 1 receptors (MC1R) on melanocytes, inducing systemic cutaneous pigmentation (tanning). Structure-activity relationship studies demonstrated that the C-terminal tripeptide fragment of alpha-MSH, Lys-Pro-Val (KPV), retains the full anti-inflammatory and cytoprotective potency of the parent hormone while completely lacking melanotropic pigment-stimulating properties.

KPV (molecular weight 383.5 g/mol) is actively transported into epithelial cells, macrophages, and neutrophils via the human Oligopeptide Transporter 1 (hPepT1). In healthy states, PepT1 is expressed primarily in the small intestine; however, during inflammatory conditions (such as Inflammatory Bowel Disease, Colitis, or Dermatitis), PepT1 expression is heavily upregulated in the colon and epidermal layers, providing an automatic targeting mechanism for KPV.

+----------------------------------------------------------------------------------------------------+
|                                        KPV MOLECULAR CASCADE                                       |
+------------------------------------+----------------------------------+-----------------------------+
| PepT1 Transporter Uptake           | NF-κB Nuclear Blockade           | Mucosal Epithelial Restitution|
| - Upregulated in inflamed tissue   | - Inhibits IκBα phosphorylation  | - Reassembles ZO-1/Occludin |
| - Direct intracellular delivery    | - Prevents p65/p50 translocation | - Reduces leukocyte influx  |
| - Bypasses surface receptors       | - Downregulates IL-1β, IL-6, TNF | - Broad candidacidal action |
+------------------------------------+----------------------------------+-----------------------------+

Chemical Structure & Molecular Specifications

Amino Acid Sequence: Lys-Pro-Val

Single Letter Code: KPV

Molecular Formula: C16H31N5O4

Molecular Weight: 357.45 g/mol (free base) / 383.5 g/mol (acetate salt)

CAS Registry Number: 67727-97-3

Conformational Feature: The central proline residue induces a rigid beta-turn conformation, optimizing both PepT1 recognition and binding to intracellular inflammatory intermediates.

Mechanism of Action

KPV exerts potent anti-inflammatory and epithelial healing activity via direct intracellular signaling:

1. PepT1-Mediated Active Cellular Internalization

Unlike larger peptides that must bind cell-surface GPCRs to trigger secondary messengers:

KPV is recognized as a di/tripeptide substrate by the proton-coupled Oligopeptide Transporter 1 (PepT1).

PepT1 rapidly translocates intact KPV across the plasma membrane directly into the cytoplasm of intestinal epithelial cells, keratinocytes, and infiltrating monocytes.

2. Inhibition of IκBα Degradation & NF-κB Inactivation

The master transcription factor Nuclear Factor Kappa B (NF-κB) orchestrates inflammatory cascades:

In the cytoplasm, KPV blocks the phosphorylation and proteasomal degradation of Inhibitor of NF-κB Alpha (IκBα).

Because IκBα remains bound to the p65/p50 NF-κB heterodimer, NF-κB is prevented from exposing its nuclear localization signal and cannot translocate into the cell nucleus.

3. Downregulation of Pro-Inflammatory Cytokines & Chemokines

With NF-κB locked out of the nucleus:

Transcription of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6, IL-8) is dramatically suppressed.

Downregulates Inducible Nitric Oxide Synthase (iNOS) and Cyclooxygenase-2 (COX-2), reducing mucosal hyperemia and edema.

Inhibits the expression of vascular cell adhesion molecule-1 (VCAM-1) and ICAM-1, halting the extravasation of neutrophils into inflamed tissue.

4. Epithelial Barrier Restitution & Antimicrobial Defense

KPV directly promotes mucosal healing:

Accelerates epithelial cell migration across denuded basement membranes, restoring Zonula Occludens-1 (ZO-1) and Occludin tight junction networks.

Direct in-vitro assays reveal that KPV exerts antimicrobial and candidacidal activity, disrupting cell wall integrity in Candida albicans and Staphylococcus aureus* without toxicity to host mammalian cells.

Key Study Highlights

✓

PepT1 Transporter Mediated

Rapidly internalized via proton-coupled oligopeptide transporter 1, upregulated in inflammation.

✓

NF-κB Nuclear Blockade

Inhibits IκBα degradation, blocking p65/p50 translocation and suppressing TNF-alpha/IL-6.

✓

Non-Melanotropic Safety

Lacks pigmentary side effects associated with full-length alpha-MSH.

✓

Mucosal Restitution & Tight Junctions

Restores ZO-1 and occludin tight junctions, accelerating mucosal barrier repair.

Scientific FAQs

No. KPV is the C-terminal tripeptide of alpha-MSH and completely lacks the central His-Phe-Arg-Trp core sequence required to activate MC1R-mediated melanin synthesis.

Inflamed tissues heavily upregulate the PepT1 transporter. KPV uses PepT1 to selectively enter inflamed epithelial cells and immune cells in high concentrations.

Molecular Formula: C16H31N5O4, Molecular Weight: 357.45 g/mol, CAS Number: 67727-97-3.

Reconstitute with sterile Bacteriostatic Water or sterile 0.9% saline. Store lyophilized vials at -20°C. Reconstituted solutions should be refrigerated at 2°C to 8°C.

References

Kannengiesser K. et al (2008).
Anti-inflammatory activities of alpha-MSH (11-13) peptide, KPV, in a mouse model of IBD
Inflamm Bowel Dis, 14(3):324-331
View Research Paper ↗
Dalmasso G. et al (2008).
PepT1-mediated tripeptide KPV transport and anti-inflammatory action in intestinal epithelial cells
Gastroenterology, 134(1):166-178
View Research Paper ↗
Brzoska T. et al (2008).
Alpha-MSH: Molecular mechanisms and clinical implications
Endocr Rev, 29(5):581-609
View Research Paper ↗

Procure Research Reference Materials

Access laboratory-grade reference compounds with verified batch HPLC purity reports and sterility documentation.

View Compound Specifications

Literature Inquiries

Have questions about the pre-clinical citations or chemical parameters detailed in this research? Connect with our analytical representatives.

Contact Researchers