What Is Allatostatin? Definition and What Research Reports

Definition

Allatostatin is a collective name for several structurally distinct families of short neuropeptides produced by insects, crustaceans and other invertebrates. The name is functional rather than structural: the first members were isolated because they inhibited the synthesis of juvenile hormone by the corpora allata, a pair of endocrine glands that regulate insect development and reproduction ("allato-" for corpora allata, "-statin" for inhibition). Later work showed that peptides carrying the allatostatin label are not one chemical family but at least three, that many of them do not inhibit juvenile hormone in every species examined, and that they act through their own G protein-coupled receptors on tissues well beyond the endocrine glands they were named after. In peptide research the term therefore functions as a historical umbrella label for a set of signalling peptides, not as a description of a single molecule.

What Class of Molecule It Is

Allatostatins are neuropeptides — short chains of amino acids, typically under about twenty residues, produced from larger precursor proteins by enzymatic processing in neurons and endocrine cells. They are released as signalling molecules and bind G protein-coupled receptors on target cells. Researchers conventionally divide them into three families defined by their conserved sequence motifs:

Where It Comes From

Allatostatins are endogenous to invertebrates. They are expressed in the central nervous system, in peripheral neurons innervating the gut and muscles, and in enteroendocrine cells of the digestive tract. They were first characterised in cockroaches and moths and have since been described in flies, mosquitoes, beetles, kissing bugs, crabs and nematodes. Receptors for allatostatin-C, for example, were identified and described in mosquitoes in work published in Peptides (Allatostatin-C receptors in mosquitoes), and a functional receptor for FGLamide-related allatostatins was identified and characterised in the Chagas disease vector Rhodnius prolixus (Insect Biochemistry and Molecular Biology, 2015).

There is no allatostatin gene in humans. The closest vertebrate counterpart is somatostatin: a comparative study in an echinoderm reported that somatostatin-type and allatostatin-C-type neuropeptides are paralogous — descended from a common ancestral gene — and that in that animal the two peptides had opposing myoregulatory (muscle-regulating) roles (PNAS, 2022). That relationship is why allatostatin-C is frequently written as "allatostatin C/somatostatin" in the comparative endocrinology literature.

How the Term Is Used in Peptide Research

Three usages dominate the published record:

• As a model neuropeptide system. Because insect and nematode nervous systems are genetically tractable, allatostatin signalling is used to study how a single peptide coordinates feeding, sleep and metabolism. Researchers reported in PLoS Genetics that allatostatin A signalling in Drosophila regulated feeding and sleep and was modulated by the circadian neuropeptide PDF.
• As a comparative model for somatostatin biology. The allatostatin-C branch is studied partly because of its evolutionary kinship with somatostatin, allowing gut–brain signalling questions to be asked in simple organisms (Nature Communications, 2022).
• As a starting point for insect growth regulator chemistry. Because the peptides act on insect endocrine targets absent in vertebrates, medicinal-chemistry groups have designed analogues. A 2025 paper in Pest Management Science described a machine-learning-based rational design approach for allatostatin analogues as lead candidates for novel insect growth regulators (Pest Management Science, 2025).

Terminology notes

Readers encountering the word in different papers should be aware that "AstA", "AstB"/"MIP" and "AstC"/"PISCF-AST" refer to different peptide families with different receptors, that the same family may be numbered differently between species, and that the original juvenile-hormone-inhibiting activity is species-dependent rather than universal.

What the Published Literature Reports

Feeding and metabolism

Two independent lines of work describe metabolic roles. Researchers reported in Scientific Reports that the neuropeptide allatostatin A regulated metabolism and feeding decisions in Drosophila. Separately, a study in Nature Communications characterised allatostatin C/somatostatin as a gut hormone and reported that it regulated food intake and metabolic homeostasis under nutrient stress.

Sleep and neural state

The PLoS Genetics work linked allatostatin A signalling to sleep as well as feeding in the fly (PLoS Genetics, 2016). A later Science Advances paper extended the theme to nematodes, where the study reported that C. elegans somatostatin/allatostatin C signalling regulated sleep, metabolism, survival and memory via a sleep-active neuron.

Immunity, cold tolerance and muscle

B-type allatostatins have been examined outside the nervous system. One study reported that B-type allatostatin regulated the immune response of hemocytes in the mud crab Scylla paramamosain, and a 2022 Scientific Reports paper examined the effect of B-type allatostatin neuropeptides on crosstalk between the insect immune response and cold tolerance. In an echinoderm, researchers reported opposing myoregulatory roles for somatostatin-type and allatostatin-C-type peptides.

Development and receptor pharmacology

In the bark beetle Dendroctonus armandi, a study functionally characterised allatostatin C (PISCF/AST) alongside juvenile hormone acid O-methyltransferase, connecting the peptide back to the juvenile hormone pathway it was named for. On the pharmacology side, a 2024 Nature Communications paper described the discovery of agonists specific for the allatostatin type-C receptor, and receptor identification work in mosquitoes (Peptides, 2010) and in Rhodnius prolixus (2015) established the receptor targets these agonists act on.

Human and Clinical Data: What Studies Report

The verified literature summarised here consists of invertebrate work — flies, mosquitoes, beetles, crabs, nematodes and an echinoderm — together with receptor pharmacology and analogue design aimed at insect targets (Pest Management Science, 2025). No human clinical trial of allatostatin appears among these papers, and none of them reported human safety, tolerability or adverse-event data. Allatostatin is not an approved drug in the United States and is not a dietary ingredient; where such peptides appear at all outside academic laboratories, they are handled as research-use-only chemicals. Because no dosing information for humans exists in this literature, none is described on this page.

Summary Table

This page is for educational purposes only and is not medical advice; consult a licensed physician before making any health decision. It summarises what published studies reported and does not describe use by people.

References

• Discovering allatostatin type-C receptor specific agonists (Nature Communications, 2024)
• C. elegans somatostatin/allatostatin C signaling regulates sleep, metabolism, survival, and memory via a sleep-active neuron (Science Advances, 2026)
• Allatostatin A Signalling in Drosophila Regulates Feeding and Sleep and Is Modulated by PDF (PLoS Genetics, 2016)
• Somatostatin-type and allatostatin-C-type neuropeptides are paralogous and have opposing myoregulatory roles in an echinoderm (PNAS, 2022)
• B-type allatostatin regulates immune response of hemocytes in mud crab Scylla paramamosain (Developmental and Comparative Immunology, 2021)
• Identification and functional characterization of FGLamide-related allatostatin receptor in Rhodnius prolixus (Insect Biochemistry and Molecular Biology, 2015)
• Allatostatin-C receptors in mosquitoes (Peptides, 2010)
• The gut hormone Allatostatin C/Somatostatin regulates food intake and metabolic homeostasis under nutrient stress (Nature Communications, 2022)
• The Neuropeptide Allatostatin A Regulates Metabolism and Feeding Decisions in Drosophila (Scientific Reports, 2015)
• The effect of B-type allatostatin neuropeptides on crosstalk between the insect immune response and cold tolerance (Scientific Reports, 2022)
• Functional Characterization of Allatostatin C (PISCF/AST) and Juvenile Hormone Acid O-Methyltransferase in Dendroctonus armandi (International Journal of Molecular Sciences, 2022)
• Machine learning-based rational design for efficient discovery of allatostatin analogs as promising lead candidates for novel IGRs (Pest Management Science, 2025)