What Is VIP Peptide?
Vasoactive intestinal peptide (VIP) is a 28-amino-acid neuropeptide belonging to the secretin-glucagon peptide superfamily. First isolated from intestinal tissue, VIP is now recognized as a widely distributed signaling molecule expressed throughout the central and peripheral nervous systems, immune tissues, and the gastrointestinal tract. In laboratory settings, VIP peptide has become a valuable tool compound for researchers investigating neuroendocrine signaling, smooth-muscle physiology, and immunomodulatory pathways.
Studies explore VIP because of its broad receptor engagement and its position at the intersection of the nervous and immune systems. Preclinical research suggests that VIP participates in the regulation of circadian rhythm within the suprachiasmatic nucleus, vasodilation of vascular beds, and modulation of inflammatory mediators in cell-culture models. As a research reagent, VIP allows investigators to probe G-protein-coupled receptor cascades and downstream second-messenger dynamics under controlled conditions. Amino Labs supplies VIP as a lyophilized, high-purity reference material intended strictly for in-vitro and preclinical laboratory investigation, not for human or animal consumption.
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How Does VIP Signal at the Molecular Level?
VIP exerts its effects primarily through two class-B G-protein-coupled receptors, VPAC1 and VPAC2, and shows affinity for the PAC1 receptor shared with the related peptide PACAP. In research models, activation of these receptors couples predominantly to the stimulatory G-protein (Gs), driving adenylate cyclase activity and elevating intracellular cyclic AMP (cAMP). This cAMP increase engages protein kinase A and, in many experimental systems, downstream transcriptional programs via CREB phosphorylation.
Investigators studying VIP frequently examine the following pathways in preclinical and cell-culture contexts:
- Immunomodulation: Studies explore how VIP influences cytokine profiles and the differentiation of regulatory immune-cell populations in vitro.
- Smooth-muscle relaxation: Research models investigate VIP-mediated vasodilation and its role as a non-adrenergic, non-cholinergic neurotransmitter.
- Neuroprotection: Preclinical research suggests VIP signaling may modulate glial responses and neuronal survival markers in experimental systems.
Because VIP shares mechanistic themes with other repair- and immune-oriented research peptides, laboratories often study it alongside compounds such as KPV and LL-37 when characterizing innate-signaling and inflammatory-pathway interactions in comparative assays. Its short circulating half-life in biological systems also makes it a useful model for studying peptidase stability and receptor-desensitization kinetics.
Handling, Storage, and Purity
VIP is supplied by Amino Labs as a lyophilized powder characterized at 99%+ purity by HPLC and confirmed by mass spectrometry. Like most peptides, VIP is sensitive to moisture, heat, and repeated freeze-thaw cycles, so careful laboratory handling preserves experimental integrity.
- Storage: Keep the sealed, lyophilized vial at -20 degrees C, protected from light. In this state the peptide remains stable for extended periods.
- Reconstitution: Researchers typically reconstitute VIP with sterile bacteriostatic or ultrapure water added gently down the vial wall, avoiding vigorous agitation that can shear the peptide.
- Aliquoting: To minimize freeze-thaw degradation, reconstituted solution is commonly divided into single-use aliquots and stored frozen.
Amino Labs is Canadian-owned and ships high-purity, third-party-tested research peptides across Canada. Each lot is provided with quality documentation to support reproducible laboratory work. Researchers seeking related repair-signaling reference compounds may also review BPC-157 for comparative studies.