KPV (Lysine-Proline-Valine) is a tripeptide fragment derived from the C-terminal sequence of alpha-melanocyte-stimulating hormone (α-MSH) that has drawn significant interest in preclinical biochemistry. Recognized for its potent anti-inflammatory properties without phototropic effects, KPV is widely studied in cellular and animal models of intestinal hyperpermeability and inflammatory signaling. PX1 Research provides US-manufactured, analytical-grade KPV research peptide tested via HPLC, MS, and LAL assays for rigorous laboratory applications.
KPV (Lysine-Proline-Valine) is a tripeptide fragment derived from the C-terminal sequence of alpha-melanocyte-stimulating hormone (α-MSH) that has drawn significant interest in preclinical biochemistry. Recognized for its potent anti-inflammatory properties without phototropic effects, KPV is widely studied in cellular and animal models of intestinal hyperpermeability and inflammatory signaling. PX1 Research provides US-manufactured, analytical-grade KPV research peptide tested via HPLC, MS, and LAL assays for rigorous laboratory applications.
Researchers seeking high-purity KPV research peptide USA options require fully characterized, lot-tested materials for reproducible experimental models. KPV (Lysine-Proline-Valine) is an anti-inflammatory tripeptide derived from the C-terminus of alpha-melanocyte-stimulating hormone (α-MSH). In preclinical research, KPV is evaluated for its capacity to inhibit NF-κB transcription and protect mucosal barrier integrity.
Due to its structural simplicity and high biological stability relative to full-length neuropeptides, the KPV research peptide has become a focus in gastroenterology and immunomodulating research. Selecting a domestic supplier with verified batch-to-batch consistency ensures that in vitro assays and animal studies yield statistically reliable, unconfounded data.
KPV consists of three amino acid residues: L-Lysine, L-Proline, and L-Valine. It represents the C-terminal tripeptide (amino acids 11–13) of α-MSH (Ac-Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2). Unlike its parent molecule, KPV does not bind productively to melanocortin receptor 1 (MC1R) to induce melanogenesis, allowing researchers to isolate anti-inflammatory signaling from pigmentary pathways.
The small molecular weight of KPV (approximately 341.45 g/mol in its free base form) facilitates intracellular uptake and transport across cellular membranes. Preclinical investigations in our broader peptide research hub demonstrate that small peptide fragments often possess unique pharmacokinetic profiles in tissue models, exhibiting resistance to rapid enzymatic degradation compared to full-length peptide hormones.
The primary mechanism of action characterized for KPV in experimental literature is the inhibition of nuclear factor kappa B (NF-κB) nuclear translocation. NF-κB serves as a master transcriptional regulator for pro-inflammatory cytokines, including TNF-α, IL-1β, IL-6, and IL-8.
In vitro assays utilizing human intestinal epithelial cells (Caco-2 and HT-29 cell lines) demonstrate that KPV entry into the cytoplasm directly interferes with the phosphorylation and degradation of IκB-α. By stabilizing the IκB-α/NF-κB complex, KPV prevents the p65 subunit of NF-κB from entering the nucleus, subsequently suppressing downstream pro-inflammatory gene expression. Researchers investigating general cytokine modulation often cross-reference these findings with other immunomodulating candidates in our catalog of synthesized research peptides.
A major focus of KPV investigation centers on gastrointestinal inflammatory models, specifically ulcerative colitis and Crohn's disease analogs in rodents (such as DSS-induced or TNBS-induced colitis). In these models, oral or systemic administration of KPV has been shown to reduce macroscopic damage scores, preserve crypt architecture, and decrease myeloperoxidase (MPO) activity in mucosal tissue.
Mechanistically, KPV interacts with PepT1 (Peptide Transporter 1), a solute carrier protein upregulated in inflamed intestinal epithelia. Transporter-mediated cellular entry allows KPV to exert intracellular anti-inflammatory actions within enterocytes and immune cells inhabiting the lamina propria. This localized activity helps restore transepithelial electrical resistance (TEER) and maintain tight junction proteins such as ZO-1 and occludin.
When designing protocols for epithelial repair or mucosal inflammation, investigators frequently compare KPV against other prominent candidates within the same functional category. The table and detailed descriptions below outline key operational differences observed in preclinical literature:
While KPV functions primarily through PepT1-mediated intracellular NF-κB inhibition, compounds like the BPC-157 research peptide mediate tissue repair via VEGFR2 activation and nitric oxide synthase pathways. Conversely, antimicrobial peptides like the LL-37 research compound act directly on bacterial cell membranes alongside host immune modulation. Assessing KPV alongside these molecules allows researchers to study synergistic or parallel pathways in gut barrier preservation.
For laboratory researchers sourcing a KPV research peptide in the USA, verifying structural identity and purity is essential to prevent false positives in high-sensitivity assays. Low-grade peptides frequently contain truncated sequences, deletion peptides, or residual counter-ions that alter cellular responses.
At PX1 Research, every batch of KPV undergoes rigorous characterization. Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) confirms chemical purity exceeding 98%, while Electrospray Ionization Mass Spectrometry (ESI-MS) confirms exact molecular weight matching theoretical mass. Analytical documentation, including lot-specific Certificates of Analysis (COAs) generated by ISO 17025 accredited partner laboratories, is made available for total transparency.
Endotoxin contamination (lipopolysaccharides derived from Gram-negative bacterial outer membranes during synthesis or purification) can invalidate cell culture and immunological studies by artificially activating Toll-like Receptor 4 (TLR4).
PX1 Research enforces strict limits on bio-burden and endotoxin levels. Utilizing Chromogenic Limulus Amebocyte Lysate (LAL) testing, our KPV batches are verified to contain <0.01 EU/μg of endotoxin. This stringent threshold prevents background inflammatory signaling in vitro, ensuring that observed reductions in NF-κB activation are attributable solely to the KPV peptide.
KPV is supplied as a lyophilized (freeze-dried) powder to maximize shelf stability. Proper handling and reconstitution techniques are required to preserve peptide integrity prior to experimental use:
1. Centrifuge the vial briefly at low speed before opening to consolidate the lyophilized cake at the bottom. 2. Reconstitute using Sterile Bacteriostatic Water (0.9% Benzyl Alcohol) for multi-use laboratory preparations, or Sterile Phosphate-Buffered Saline (PBS, pH 7.4) for immediate cell culture application. 3. Gently swirl or invert the vial; avoid vigorous vortexing to prevent mechanical shear stress on the peptide structure. 4. Aliquot reconstituted stock solutions into single-use polypropylene tubes to minimize freeze-thaw cycles.
Lyophilized KPV remains stable at room temperature for short durations during transport, but long-term preservation requires controlled environmental conditions. Upon arrival at your research facility, store lyophilized vials at -20°C or -80°C in a manual defrost freezer.
Reconstituted liquid aliquots should be stored at 4°C for short-term assays (up to 7 days) or -20°C for extended storage (up to 3 months). Avoid repeated temperature fluctuations, as condensation inside the vial can accelerate peptide hydrolysis.
PX1 Research serves academic institutions, contract research organizations (CROs), and private biotechnology laboratories across the United States. All orders ship directly from domestic facilities located in California and Arizona, providing rapid fulfillment with same-day dispatch for orders placed before daily cutoff times.
Principal investigators and procurement officers interested in bulk quantities or customized synthesis batches can establish institutional wholesale accounts to access volume pricing and dedicated technical account management.
What is KPV research peptide?
KPV is a tripeptide composed of Lysine-Proline-Valine. Derived from the C-terminus of alpha-MSH, it is studied in preclinical research for its ability to modulate inflammatory responses and NF-κB activity without triggering melanocortin receptor activation.
Does KPV activate melanocortin receptors like full-length alpha-MSH?
In vitro receptor binding assays demonstrate that KPV lacks the central His-Phe-Arg-Trp sequence required for robust MC1R binding. Consequently, it does not induce melanogenesis, allowing researchers to study isolated anti-inflammatory pathways.
How is KPV purity verified by PX1 Research?
Every lot of KPV manufactured for PX1 Research undergoes RP-HPLC to confirm analytical purity (≥98%) and Mass Spectrometry (ESI-MS) to verify molecular mass identity. Certificates of Analysis are published per lot.
What endotoxin levels are acceptable for KPV in preclinical assays?
High endotoxin levels can mask or confound immune activity in experimental models. PX1 Research KPV is batch-tested via LAL assay to ensure endotoxin levels remain below 0.01 EU/μg.
What solvent should be used to reconstitute KPV for cell culture work?
For in vitro cell culture, sterile low-endotoxin PBS (pH 7.4) or sterile water is recommended. If stock solutions will be used over several days in non-cellular assays, 0.9% bacteriostatic water can be utilized.
How long is lyophilized KPV stable at freezer temperatures?
When stored in a sealed, desiccated container at -20°C or -80°C, lyophilized KPV maintains chemical stability for up to 24 months from the date of synthesis.
What transporter facilitates cellular entry of KPV in intestinal models?
Preclinical studies show that KPV is transported into enterocytes primarily by PepT1 (Peptide Transporter 1), a membrane transporter upregulated during mucosal inflammation.
Where does PX1 Research ship KPV research peptides from?
All PX1 Research products are stored and dispatched from fulfillment centers in California and Arizona, ensuring fast domestic ground and expedited delivery to US laboratories.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.