Introduction
The gut-brain axis — the bidirectional communication network linking the enteric nervous system, gut microbiome, immune system, and central nervous system — has emerged as one of the most transformative concepts in modern biomedical research. Peptides are central mediators of this axis, acting as signalling molecules that translate gut conditions into systemic and neurological responses. Understanding how peptides regulate gut-brain communication has implications for research into metabolic disease, neurodegeneration, psychiatric conditions, and inflammatory bowel disease.
For research and laboratory use only. Not intended for human or veterinary administration.
The Gut-Brain Axis: Key Mechanisms
Communication along the gut-brain axis occurs through four primary channels: the vagus nerve (carrying afferent signals from enteroendocrine cells to the brainstem), the enteric nervous system (the ‘second brain’ containing over 500 million neurons), the systemic circulation (carrying gut-derived hormones and metabolites), and the immune system (gut-associated lymphoid tissue communicating with peripheral and central immune cells). Peptides interact with all four channels.
Key Research Compounds
GLP-1 (Glucagon-Like Peptide-1)
Secreted by L-cells in the distal intestine in response to nutrient ingestion, GLP-1 is one of the most important gut-brain signalling peptides. Beyond its pancreatic effects, GLP-1 acts on vagal afferent neurons to signal satiety to the hypothalamus, modulates gastric emptying, and exerts direct effects on the CNS via GLP-1 receptors in the brainstem and hypothalamus. Research has increasingly focused on GLP-1’s role in neuroinflammation, gut motility disorders, and the microbiome-GLP-1 secretion relationship.
BPC-157
A synthetic pentadecapeptide derived from gastric juice that has demonstrated remarkable activity across the gut-brain axis in preclinical research. BPC-157 has been studied for its ability to heal gastrointestinal mucosa, modulate the enteric nervous system, influence dopaminergic and serotonergic neurotransmission, and protect against stress-induced gut permeability (‘leaky gut’). Its ability to act at both the gut and CNS levels makes it a uniquely relevant compound for gut-brain axis research.
VIP (Vasoactive Intestinal Peptide)
A neuropeptide abundantly expressed in the enteric nervous system where it acts as a primary inhibitory neurotransmitter, regulating smooth muscle relaxation, intestinal secretion, and mucosal immune function. VIP also modulates gut microbiome composition through its effects on intestinal immune cells and mucus secretion. In the CNS, VIP serves as a circadian synchroniser in the SCN. Research applications include inflammatory bowel disease models, gut motility research, and investigation of VIP’s immunomodulatory role in the gut mucosa.
PYY (Peptide YY)
A 36-amino acid peptide released from L-cells alongside GLP-1 in response to food intake. PYY acts on Y2 receptors on vagal afferents and in the hypothalamus to suppress appetite and reduce food intake. Research has explored PYY’s role in post-bariatric surgery metabolic improvements, its interactions with the gut microbiome, and its potential in obesity and eating disorder models.
Ghrelin
The only known orexigenic (appetite-stimulating) gut hormone, ghrelin is produced primarily in the stomach and acts on GHS-R1a receptors in the hypothalamus and vagus nerve to stimulate hunger, promote GH release, and regulate energy homeostasis. Research applications include appetite regulation models, GH axis research, gastroparesis models, and investigation of ghrelin’s role in stress responses and reward circuitry.
KPV
A tripeptide derived from α-MSH that has demonstrated potent anti-inflammatory effects in the gut mucosa through melanocortin receptor-mediated NF-κB suppression. KPV has been studied extensively in inflammatory bowel disease models (Crohn’s disease and ulcerative colitis), where its ability to reduce mucosal inflammation and restore barrier function is of significant research interest. Its small size allows for oral delivery research in gut-targeted applications.
The Microbiome-Peptide Connection
An emerging area of gut-brain axis research concerns the bidirectional relationship between the gut microbiome and peptide signalling. Gut bacteria influence the secretion of enteroendocrine peptides (GLP-1, PYY, ghrelin) through production of short-chain fatty acids and secondary bile acids. Conversely, peptides such as VIP and BPC-157 influence microbiome composition through their effects on gut immunity and mucosal integrity. This microbiome-peptide crosstalk represents a frontier area of research with implications for metabolic disease, neuropsychiatric conditions, and inflammatory bowel disease.
Research Applications
- Inflammatory bowel disease and gut mucosal repair models
- Appetite regulation and satiety signalling research
- Gut motility and enteric nervous system models
- Microbiome-peptide interaction research
- Gut permeability and barrier function models
- Neuropsychiatric conditions linked to gut-brain dysregulation
- Post-bariatric surgery metabolic research
Storage and Handling
Store lyophilised gut-brain peptides at −20°C. Reconstitute with bacteriostatic water unless otherwise specified. Once reconstituted, store at 2–8°C and use within 28 days. Avoid repeated freeze-thaw cycles.
All products supplied by Vanta Labs are intended strictly for laboratory and research purposes.