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Neuropeptides and Animal Physiology
Research Guide
What is Neuropeptides and Animal Physiology?
Neuropeptides and animal physiology is the study of how peptide-based signaling molecules produced by neurons and endocrine tissues regulate organ function and behavior across animal systems through specific receptors and downstream cellular pathways.
The literature tagged to “Neuropeptides and Animal Physiology” comprises 113,354 works in the provided dataset, indicating a large and methodologically diverse research area.
Research Sub-Topics
Neuropeptide Y Physiology
This sub-topic investigates NPY's roles in feeding behavior, stress responses, and cardiovascular regulation across vertebrate species. Researchers characterize receptor subtypes and signaling pathways in animal models.
Oxytocin in Social Behavior
This sub-topic explores oxytocin's modulation of affiliation, aggression, and parental care in rodents and primates. Researchers use knockout models and infusions to dissect circuit-specific effects.
Substance P Pain Pathways
This sub-topic examines tachykinin NK1 receptor signaling in nociception, inflammation, and visceral pain in mammals. Researchers develop antagonists and study spinal cord transmission.
Vasoactive Intestinal Peptide Regulation
This sub-topic studies VIP's control of gastrointestinal motility, secretion, and circadian rhythms in animal physiology. Researchers analyze receptor distribution and knockout phenotypes.
Insect Neuropeptide Endocrinology
This sub-topic characterizes neuropeptides like allatostatins and capa in regulating insect reproduction, diuresis, and metamorphosis. Researchers sequence genomes and apply RNAi in model species.
Why It Matters
Neuropeptide research matters because peptide neuromodulators and their receptors are tractable targets for interventions that aim to change clinically and physiologically relevant states such as pain, vascular tone, inflammation, and addiction-related behavior. A concrete example of peptide-mediated physiology is the discovery of endogenous opioid peptides: “Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975) reported brain-derived pentapeptides with potent opiate agonist activity, providing a mechanistic bridge between neurochemical signaling and analgesia and motivating receptor-focused pharmacology. In parallel, receptor biology and structure enable translation from ligand identity to tissue-level effects: “High-Resolution Crystal Structure of an Engineered Human β2-Adrenergic G Protein–Coupled Receptor” (2007) presented a high-resolution GPCR structure, supporting structure-guided approaches to modulating neuropeptide/biogenic-amine signaling pathways that control cardiovascular and smooth-muscle physiology. Neuropeptide-adjacent neuromodulatory circuits are also central to psychiatric and behavioral outcomes: Koob and Volkow’s “Neurobiology of addiction: a neurocircuitry analysis” (2016) synthesized circuit-level mechanisms relevant to compulsive drug use, connecting neuromodulator systems to disease burden and treatment strategies. Finally, peptide and gaseous signaling intersect with vascular and immune physiology: Furchgott and Zawadzki’s “The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine” (1980) and Kubes et al.’s “Nitric oxide: an endogenous modulator of leukocyte adhesion.” (1991) exemplify how endothelium-derived mediators shape smooth muscle relaxation and leukocyte–endothelium interactions, respectively—core processes in hemodynamics and inflammation.
Reading Guide
Where to Start
Start with “Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975) because it provides a direct, historically important example of endogenous peptide signaling with clear physiological and pharmacological implications.
Key Papers Explained
“Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975) anchors the topic by showing that endogenous peptides can act as potent agonists, motivating receptor-centric mechanistic work. Missale et al. (1998) in “Dopamine Receptors: From Structure to Function” and Kebabian and Calne (1979) in “Multiple receptors for dopamine” illustrate how receptor multiplicity and subtype properties explain diverse physiological actions, a framework that generalizes to neuropeptide receptor families. Cherezov et al. (2007) in “High-Resolution Crystal Structure of an Engineered Human β2-Adrenergic G Protein–Coupled Receptor” provides a structural template for understanding how ligands engage GPCRs, complementing functional receptor reviews. Furchgott and Zawadzki (1980) in “The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine” and Kubes et al. (1991) in “Nitric oxide: an endogenous modulator of leukocyte adhesion.” connect signaling mediators to organ-level vascular and immune physiology, demonstrating how molecular signaling scales to tissue function. Koob and Volkow (2016) in “Neurobiology of addiction: a neurocircuitry analysis” extends the discussion to systems neuroscience and disease-relevant behavioral physiology.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
An advanced direction is integrating receptor structure, subtype diversity, and tissue/circuit physiology into unified mechanistic models: GPCR structural constraints from “High-Resolution Crystal Structure of an Engineered Human β2-Adrenergic G Protein–Coupled Receptor” (2007) can be paired with receptor-function frameworks from “Dopamine Receptors: From Structure to Function” (1998) to formulate testable hypotheses about ligand efficacy, bias, and physiological specificity. Another frontier is multi-scale linkage from cellular mediators to organismal outcomes, building from endothelium-dependent relaxation in “The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine” (1980) and leukocyte–endothelium regulation in “Nitric oxide: an endogenous modulator of leukocyte adhesion.” (1991) toward integrated cardio-immune physiology. A third direction is connecting neuromodulator systems to pathological behavioral states using the systems-level framing in “Neurobiology of addiction: a neurocircuitry analysis” (2016), while grounding hypotheses in endogenous peptide signaling exemplified by “Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975).
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The obligatory role of endothelial cells in the relaxation of ... | 1980 | Nature | 12.0K | ✕ |
| 2 | Carrageenin-Induced Edema in Hind Paw of the Rat as an Assay f... | 1962 | Experimental Biology a... | 5.6K | ✕ |
| 3 | A simple and very efficient method for generating cDNA libraries | 1983 | Gene | 4.6K | ✕ |
| 4 | Microglia Sculpt Postnatal Neural Circuits in an Activity and ... | 2012 | Neuron | 3.9K | ✓ |
| 5 | Identification of two related pentapeptides from the brain wit... | 1975 | Nature | 3.8K | ✕ |
| 6 | Multiple receptors for dopamine | 1979 | Nature | 3.7K | ✕ |
| 7 | Dopamine Receptors: From Structure to Function | 1998 | Physiological Reviews | 3.6K | ✕ |
| 8 | Neurobiology of addiction: a neurocircuitry analysis | 2016 | The Lancet Psychiatry | 3.3K | ✓ |
| 9 | High-Resolution Crystal Structure of an Engineered Human β <su... | 2007 | Science | 3.2K | ✓ |
| 10 | Nitric oxide: an endogenous modulator of leukocyte adhesion. | 1991 | Proceedings of the Nat... | 3.0K | ✓ |
In the News
News
28 October 2025 ### New ASIC grant
Imaginal discs produce neuropeptide-like precursor 1 to ...
temperatures, but with reduced body size and fertility. In this study, we show that the neuropeptide gene*neuropeptide-like precursor 1*(*Nplp1*) alleviates temperature-induced ER stress in imagina...
SIFa peptidergic neurons orchestrate the internal states and energy balance of male Drosophila melanogaster
**Funding:**This research was supported a University of Ottawa Startup grant 602496 to WJK, Startup funds from HIT Center for Life Science to WJK, a University of Ottawa Interdisciplinary Research ...
More Than Three Decades After Discovery of the ...
This manuscript aims to explore the reasons behind clinicians’ limited focus on PACAP as a therapeutic agent, despite its demonstrated neuroprotective effects in countless preclinical studies. Base...
Daniel R. Weinberger receives the Heinrich Lanz Prize for ...
In 2025, the Heinrich Lanz Foundation will award the Heinrich Lanz Prize for translational research in the field of psychiatry for the first time. This year, the prize, endowed with 100,000 euros, ...
Code & Tools
NpSearch is a tool for identifying neuropeptides from genomic and proteomic data npsearch.co.uk ### License AGPL-3.0 license
Neural signal propagation atlas [1], genome [2], and single-cell transcriptome [3], neuropeptide/GPCR deorphanization [4], anatomical connectome [5...
**neuralib** is a utility toolkit for rodent systems neuroscience research. It provides wrappers, parsers, and tools for efficient data handling, a...
This is the repository accompanying the SIPEC publication\* , which is a pipeline that enables all-round behavioral analysis through the usage of s...
`neurolib`provides a simulation and optimization framework which allows you to easily implement your own neural mass model, simulate fMRI BOLD acti...
Recent Preprints
Neuropeptide-mediated synaptic plasticity regulates context ...
Neuropeptides play crucial roles in regulating context-dependent behaviors, but the underlying mechanisms remain elusive. We investigate the role of the neuropeptide SIFa and its receptor SIFaR in ...
Two neuropeptides that promote blood feeding in ...
neuromodulators and neuropeptides ( 9 , 10 , 17 – 22 ). In the central brain, internal nutrient or hormone sensors can monitor the animal’s nutritional state.
Imaginal discs produce neuropeptide-like precursor 1 to ...
In mammals, prolonged heat stress induces an endoplasmic reticulum (ER) stress response that can damage internal organs. In*Drosophila*, larvae grow and develop into adults faster at warmer tempera...
Role of the Insect Neuroendocrine System in the Response to Cold Stress
processes in insects, causing changes in main metabolic pathways, cellular dehydration, loss of neuromuscular function, and imbalance in water and ion homeostasis. The neuroendocrine system and its...
Cardioregulatory Functions of Neuropeptides and Peptide Hormones in Insects
Neuropeptides and peptide hormones from non-neuronal tissues play important roles in the regulation of insect life. In recent years, the rapid development of analytical techniques has contributed t...
Latest Developments
Recent developments in neuropeptides and animal physiology research include the identification of autocrine feedback mechanisms maintaining neuropeptide homeostasis in neurons (bioRxiv, 2026), the discovery of over 250 neuropeptides in _C. elegans_ (NCBI Bookshelf, 2024), and the characterization of neuropeptide signaling systems in invertebrates, such as bombesin-type peptides (PNAS, 2025). Additionally, recent studies explore neuropeptide regulation of behaviors like satiation (Nature, 2024) and energy expenditure (Nature, 2024).
Sources
Frequently Asked Questions
What are neuropeptides in the context of animal physiology?
Neuropeptides are peptide signaling molecules produced by nervous and endocrine tissues that modulate physiology by acting on specific receptors and downstream signaling pathways. A canonical example of endogenous peptide signaling is described in “Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975), which reported brain-derived pentapeptides with potent opiate agonist activity.
How do receptors translate neuropeptide and neuromodulator signals into physiological effects?
Many neuromodulator receptors are G protein–coupled receptors (GPCRs) that couple ligand binding to intracellular signaling cascades that change cell excitability, secretion, or contractility. “Dopamine Receptors: From Structure to Function” (1998) summarized that dopamine’s diverse physiological actions are mediated by at least five distinct GPCR subtypes, illustrating how receptor diversity supports diverse physiological outputs.
Which experimental papers in the provided list are most relevant for linking signaling molecules to vascular physiology?
“The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine” (1980) established that endothelial cells are required for acetylcholine-induced relaxation of arterial smooth muscle, a foundational observation for understanding endothelium-dependent vasodilation. “Nitric oxide: an endogenous modulator of leukocyte adhesion.” (1991) tested how endogenous nitric oxide affects leukocyte adhesion to vascular endothelium, linking signaling to immune–vascular interactions.
How are inflammation-related physiological readouts commonly quantified in animal studies?
“Carrageenin-Induced Edema in Hind Paw of the Rat as an Assay for Antiinflammatory Drugs” (1962) described an assay in which injection of 0.05 ml of a 1% carrageenin solution into rat hind paw plantar tissue produces edema that peaks within 3 to 4 hours and can be inhibited by pretreatment. This provides a standardized tissue-level physiological endpoint often used to evaluate anti-inflammatory interventions.
Which papers connect neuromodulatory systems to behavior and disease-relevant physiology?
Koob and Volkow’s “Neurobiology of addiction: a neurocircuitry analysis” (2016) synthesized how neurocircuitry and neuromodulator systems contribute to addiction-relevant behaviors. “Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975) connected endogenous peptide signaling to opiate-like activity, a direct bridge between neurochemistry and pain-related behavior.
Which methods from the provided list support discovery workflows relevant to neuropeptide biology?
“A simple and very efficient method for generating cDNA libraries” (1983) is a foundational molecular method that supports cloning and identification of peptide precursors and receptors at the nucleic-acid level. Such library-based approaches enable systematic discovery of genes that encode neuropeptides, processing enzymes, or receptor families.
Open Research Questions
- ? How can endogenous peptide ligands and their receptor subtypes be mapped to specific physiological outputs with the same clarity achieved for dopamine receptor subtypes in “Dopamine Receptors: From Structure to Function” (1998)?
- ? Which structural features of GPCRs, as exemplified by “High-Resolution Crystal Structure of an Engineered Human β2-Adrenergic G Protein–Coupled Receptor” (2007), most strongly predict whether a neuromodulatory ligand will bias signaling toward specific downstream pathways relevant to organ physiology?
- ? How do endothelium-dependent mediators identified in “The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine” (1980) interact with other endogenous modulators such as nitric oxide described in “Nitric oxide: an endogenous modulator of leukocyte adhesion.” (1991) to coordinate integrated vascular, immune, and smooth-muscle physiology?
- ? Which circuit-level mechanisms summarized in “Neurobiology of addiction: a neurocircuitry analysis” (2016) are most sensitive to modulation by endogenous opioid peptides described in “Identification of two related pentapeptides from the brain with potent opiate agonist activity” (1975), and what physiological readouts best capture these interactions?
Recent Trends
The provided dataset reports 113,354 works associated with “Neuropeptides and Animal Physiology,” reflecting a large research base, while a 5-year growth rate is not available (N/A) in the provided data.
Within the most-cited core, emphasis spans peptide ligands (“Identification of two related pentapeptides from the brain with potent opiate agonist activity” ), receptor multiplicity and function (“Multiple receptors for dopamine” (1979); “Dopamine Receptors: From Structure to Function” (1998)), receptor structure (“High-Resolution Crystal Structure of an Engineered Human β2-Adrenergic G Protein–Coupled Receptor” (2007)), and organ-level mediator biology in vascular and immune contexts (“The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine” (1980); “Nitric oxide: an endogenous modulator of leukocyte adhesion.” (1991)).
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