Subtopic Deep Dive
Vasoactive Intestinal Peptide Regulation
Research Guide
What is Vasoactive Intestinal Peptide Regulation?
Vasoactive Intestinal Peptide Regulation examines the mechanisms controlling VIP expression, release, receptor signaling, and physiological roles in gastrointestinal motility, secretion, and circadian rhythms across animal species.
VIP, a 28-amino-acid neuropeptide, acts via G protein-coupled receptors to modulate smooth muscle relaxation and epithelial secretion in the gut (Larsson et al., 1976, 618 citations). Studies map VIP distribution in central and peripheral neurons of rats and guinea pigs using immunohistochemistry (Schultzberg et al., 1980, 889 citations). Receptor desensitization impacts VIP neuronal functions (Gainetdinov et al., 2004, 851 citations).
Why It Matters
VIP regulation informs therapies for gastrointestinal motility disorders in veterinary medicine, as knockout phenotypes reveal roles in gut secretion and circadian entrainment. Larsson et al. (1976) localized VIP to gastrointestinal nerves, supporting peptide-based treatments for digestive issues in animals like pigs and rats. Gainetdinov et al. (2004) detailed GPCR desensitization, aiding drug design for neuropeptide signaling disruptions in animal health. Schultzberg et al. (1980) mapped VIP neurons, advancing models of autonomic control in livestock physiology.
Key Research Challenges
Receptor Desensitization Mechanisms
GPCR desensitization limits VIP signaling duration in gut neurons. Gainetdinov et al. (2004) showed arrestin-mediated internalization reduces neuronal responses. Challenge persists in quantifying recovery kinetics across species.
Species-Specific Distribution Mapping
VIP neuron localization varies between rats, guinea pigs, and larger animals. Schultzberg et al. (1980) used antisera for immunohistochemical mapping in rodents. Extending to livestock requires scalable imaging techniques.
Knockout Phenotype Analysis
VIP receptor knockouts alter motility and secretion, but behavioral assays lack standardization. Larsson et al. (1976) identified peripheral VIP roles, yet circadian impacts need longitudinal studies. Integrating multi-omics data poses analytical hurdles.
Essential Papers
Calcitonin gene-related peptide immunoreactivity in the spinal cord of man and of eight other species
S.J. Gibson, J.M. Polak, S.R. Bloom et al. · 1984 · Journal of Neuroscience · 1.0K citations
Calcitonin gene-related peptide (CGRP) immunoreactivity was found throughout the entire spinal cord of man, marmoset, horse, pig, cat, guinea pig, mouse, rat, and frog. CGRP-immunoreactive fibers w...
Autonomic regulation of islet hormone secretion - Implications for health and disease
Bo Åhrén · 2000 · Diabetologia · 892 citations
Distribution of peptide- and catecholamine-containing neurons in the gastro-intestinal tract of rat and guinea-pig: Immunohistochemical studies with antisera to substance P, vasoactive intestinal polypeptide, enkephalins, somatostatin, gastrin/cholecystokinin, neurotensin and dopamine β-hydroxylase
Marianne Schultzberg, T. Hökfelt, Göran Nilsson et al. · 1980 · Neuroscience · 889 citations
DESENSITIZATION OF G PROTEIN–COUPLED RECEPTORS AND NEURONAL FUNCTIONS
Raul R. Gainetdinov, Richard T. Premont, Laura Bohn et al. · 2004 · Annual Review of Neuroscience · 851 citations
▪ Abstract G protein–coupled receptors (GPCRs) have proven to be the most highly favorable class of drug targets in modern pharmacology. Over 90% of nonsensory GPCRs are expressed in the brain, whe...
The role of substance P in inflammatory disease
Terence M. O’Connor, Joseph O’Connell, Darren I. O’Brien et al. · 2004 · Journal of Cellular Physiology · 766 citations
Abstract The diffuse neuroendocrine system consists of specialised endocrine cells and peptidergic nerves and is present in all organs of the body. Substance P (SP) is secreted by nerves and inflam...
Cholecystokinin bioactivity in human plasma. Molecular forms, responses to feeding, and relationship to gallbladder contraction.
Rodger A. Liddle, Ira D. Goldfine, Matthew S. Rosen et al. · 1985 · Journal of Clinical Investigation · 743 citations
A sensitive and specific bioassay for the measurement of cholecystokinin (CCK) in human plasma was developed to determine the molecular forms of CCK in circulation, CCK responses to feeding, and th...
The Origin and Function of the Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP)/Glucagon Superfamily*
Nancy M. Sherwood, Sandra L. Krueckl, John E. McRory · 2000 · Endocrine Reviews · 667 citations
The pituitary adenylate cyclase-activating polypeptide (PACAP)/ glucagon superfamily includes nine hormones in humans that are related by structure, distribution (especially the brain and gut), fun...
Reading Guide
Foundational Papers
Start with Larsson et al. (1976) for VIP localization in neurons (618 citations), then Schultzberg et al. (1980) for GI distribution (889 citations), followed by Gainetdinov et al. (2004) for receptor mechanisms (851 citations).
Recent Advances
Åhrén (2000) on autonomic regulation (892 citations); Sherwood et al. (2000) on PACAP superfamily relating to VIP (667 citations).
Core Methods
Immunohistochemistry with antisera (Schultzberg et al., 1980); radioimmunoanalysis (Larsson et al., 1976); GPCR desensitization via arrestins (Gainetdinov et al., 2004).
How PapersFlow Helps You Research Vasoactive Intestinal Peptide Regulation
Discover & Search
Research Agent uses searchPapers('VIP regulation gastrointestinal motility animal') to retrieve Larsson et al. (1976) and Schultzberg et al. (1980), then citationGraph reveals 618+ citing works on neuropeptide distribution; exaSearch uncovers knockout studies in rodents.
Analyze & Verify
Analysis Agent applies readPaperContent on Gainetdinov et al. (2004) to extract GPCR desensitization data, verifyResponse with CoVe checks claims against abstracts, and runPythonAnalysis plots receptor internalization rates from extracted figures using matplotlib for statistical verification; GRADE assigns high evidence to immunohistochemical mappings.
Synthesize & Write
Synthesis Agent detects gaps in species-specific VIP data via contradiction flagging across Schultzberg et al. (1980) and Larsson et al. (1976); Writing Agent uses latexEditText for manuscript sections, latexSyncCitations integrates 889+ refs, latexCompile generates PDF, and exportMermaid diagrams VIP signaling pathways.
Use Cases
"Analyze VIP receptor desensitization kinetics from Gainetdinov 2004 using Python."
Research Agent → searchPapers → Analysis Agent → readPaperContent + runPythonAnalysis (NumPy/pandas curve fitting on internalization data) → matplotlib plot of recovery rates.
"Write LaTeX review on VIP distribution in rodent gut citing Schultzberg 1980."
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft section) → latexSyncCitations (add 889 refs) → latexCompile → PDF with figure legends.
"Find code for VIP immunohistochemistry analysis from related papers."
Research Agent → citationGraph (Schultzberg 1980) → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → export code for image quantification pipelines.
Automated Workflows
Deep Research workflow conducts systematic review: searchPapers (VIP regulation) → 50+ papers including Larsson (618 cites) → structured report with GRADE scores on motility claims. DeepScan applies 7-step analysis: readPaperContent (Gainetdinov) → CoVe verification → runPythonAnalysis on signaling data. Theorizer generates hypotheses on VIP-circadian links from Schultzberg distributions.
Frequently Asked Questions
What defines Vasoactive Intestinal Peptide Regulation?
It studies VIP control of gut motility, secretion, and rhythms via receptors in animals, mapped by immunohistochemistry (Larsson et al., 1976).
What are key methods in VIP regulation research?
Immunohistochemistry localizes VIP neurons (Schultzberg et al., 1980); radioimmunoassays quantify release (Larsson et al., 1976); GPCR desensitization assays assess signaling (Gainetdinov et al., 2004).
What are foundational papers?
Larsson et al. (1976, PNAS, 618 citations) localizes VIP; Schultzberg et al. (1980, Neuroscience, 889 citations) maps GI tract neurons; Gainetdinov et al. (2004, 851 citations) covers GPCR desensitization.
What open problems exist?
Species extrapolation from rodents to livestock; circadian knockout phenotypes; multi-omics integration for receptor dynamics lack standardized models.
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