Research Comparison
KPV vs VIP
A side-by-side research comparison of KPV and VIP drawn from DRPSHP' peptide database records.
KPV
KPV is the three-residue peptide lysine-proline-valine, identical to the final three residues of alpha-melanocyte-stimulating hormone (alpha-MSH). It does not contain the His-Phe-Arg-Trp core through which alpha-MSH activates melanocortin receptors, so its pharmacology should not be assumed to match the hormone's. Attention to it followed reports that C-terminal fragments of alpha-MSH change inflammatory signalling in cell and animal models. The studies are mostly in cultured epithelial and immune cells and in mouse models of chemically induced colitis. The body of work is small, and human data are scarce.
VIP
Vasoactive intestinal peptide was named for what its discoverers saw first, relaxation of blood vessels, after isolating it from gut tissue. It is a 28-residue amidated neuropeptide present in central and peripheral neurons and in the intestinal wall, a member of the secretin-glucagon family and a close relative of PACAP, with which it shares receptors. Today it is investigated as a neurotransmitter, a smooth-muscle signal and a link between nervous and immune systems. Most evidence comes from cells, tissues and animals. Small human studies of synthetic VIP exist, including for pulmonary (lung) conditions, though its removal from blood within minutes complicates them.
Reading a comparison
A comparison places two records side by side; it does not merge them. Each description above is drawn from that compound's own record, and the two were not necessarily characterised by the same methods, at the same time, or to the same level of detail. Before comparing any attribute, it is worth establishing that both records describe the substance you think they describe — names are not identifiers, and two entries sharing a name can differ in salt form, stereochemistry or the convention used to state a mass. Where a figure carries no method beside it, the comparison is between two reported numbers rather than between two measurements.