VIP, short for vasoactive intestinal peptide, is a naturally occurring 28-amino-acid neuropeptide belonging to the glucagon/secretin peptide family. It is widely studied in molecular biology, neurobiology, gastrointestinal research, vascular signaling, and receptor pharmacology. VIP research commonly focuses on its interactions with the VPAC1 (VIPR1) and VPAC2 (VIPR2) G protein-coupled receptors and the downstream signaling pathways associated with these receptors. Research literature also examines VIP in relation to smooth muscle, neural signaling, immune-cell biology, and gastrointestinal physiology. Helix Bio supplies VIP as a research-use-only peptide for qualified laboratory and scientific research. It is not intended for human or veterinary administration.
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What Is VIP?
Vasoactive intestinal peptide, commonly abbreviated VIP, is an endogenous neuropeptide consisting of 28 amino acids. It was first identified in the context of intestinal tissue but has since been studied across numerous biological systems.
VIP belongs to the glucagon/secretin superfamily of peptides. Its molecular structure and signaling characteristics are closely related to pituitary adenylate cyclase-activating peptide (PACAP).
The biological activity of VIP is primarily associated with two receptors:
Both receptors are G protein-coupled receptors and have been extensively investigated in receptor pharmacology and cellular signaling research.
VIP is a 28-amino-acid peptide derived from the larger prepro-VIP precursor. Cellular processing produces the mature peptide used in physiological signaling.
For research purposes, VIP provides a defined peptide ligand for studying receptor activation, signal transduction, and peptide-mediated cellular responses.
VIP is relevant to laboratory research involving:
Research has demonstrated that VIP interacts with both VPAC1 and VPAC2 receptors, making it useful for comparative studies of receptor selectivity and ligand-receptor interactions.
A major area of VIP research is the relationship between the peptide and its two principal receptor subtypes.
VPAC1: VPAC1 is a G protein-coupled receptor expressed across multiple tissues and cell types. Research has examined its role in VIP-mediated signaling and receptor pharmacology.
VPAC2: VPAC2 is another major VIP receptor and has distinct expression patterns and signaling characteristics. Comparative VPAC1/VPAC2 experiments can help researchers investigate receptor subtype selectivity.
The two receptors are sufficiently distinct that researchers can use selective ligands and receptor models to investigate how peptide structure influences receptor recognition and downstream signaling.
VIP receptor activation is associated with G protein-mediated intracellular signaling. Research models commonly investigate downstream second-messenger systems such as adenylate cyclase and cyclic AMP (cAMP).
This makes VIP relevant to experiments examining:
VIP receptor signaling has also been investigated in human immune-cell models, including studies examining VPAC1 and VPAC2 receptor expression in T cells and monocytes.
VIP has an established place in gastrointestinal research because of its distribution in the enteric nervous system and its relationship with intestinal signaling pathways.
Research literature describes VIP as a broadly distributed neuropeptide involved in numerous physiological processes, with particular interest in gastrointestinal and neural signaling.
For laboratory researchers, this makes VIP useful as a molecular tool for studying peptide-mediated communication in gastrointestinal and enteric models.
VIP is particularly useful when a research project requires a well-characterized endogenous neuropeptide ligand for investigating receptor-mediated signaling.
Its established relationship with VPAC1 and VPAC2 makes it relevant to receptor pharmacology, ligand selectivity, and structure-function experiments. Researchers can also study VIP in different cellular contexts to examine how receptor expression and downstream signaling vary between biological models.
Helix Bio's website describes a quality program involving independent HPLC purity testing, mass spectrometry identity confirmation, and batch-specific Certificates of Analysis. The company's site also states that its research materials are supplied for laboratory use rather than human or veterinary administration.
For researchers, the most important consideration is the documentation associated with the specific lot being evaluated. Purity, identity, quantity, storage conditions, and other analytical characteristics should be confirmed against the current product documentation.
VIP is intended for qualified scientific and laboratory users, including:
It is not intended for consumers seeking personal health, cosmetic, wellness, or therapeutic applications.
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