Peptides Similar to Cortistatin
Compare Cortistatin with related peptides and alternatives
📌TL;DR
- •1 similar peptides identified
- •Oveporexton: Low - Both relate to sleep neurobiology, but cortistatin promotes slow-wave sleep while oveporexton promotes wakefulness for narcolepsy
Quick Comparison
| Peptide | Similarity | Key Differences |
|---|---|---|
| Cortistatin (current) | - | - |
| Oveporexton | Low - Both relate to sleep neurobiology, but cortistatin promotes slow-wave sleep while oveporexton promotes wakefulness for narcolepsy | Cortistatin is an endogenous neuropeptide that enhances slow-wave sleep. Oveporexton is a synthetic small molecule that activates OX2R to promote wakefulness. They target different aspects of sleep-wake regulation. |
Peptides Related to Cortistatin#
Cortistatin occupies a unique niche as both a sleep-promoting neuropeptide and a potent anti-inflammatory factor. Its structural homology with somatostatin and unique ghrelin receptor binding make comparisons with several peptide families relevant.
Somatostatin (SST-14)#
Somatostatin-14 is cortistatin's closest structural relative, sharing 11 of 14 amino acid residues.
Structural comparison: Both are cyclic 14-amino-acid peptides with an intramolecular disulfide bond. The core FWKTFTSC motif is conserved. However, they are encoded by separate genes on different chromosomes.
Receptor comparison: Both bind all five somatostatin receptors (sst1-5) with comparable affinity. The key difference is that cortistatin uniquely activates the ghrelin receptor (GHSR-1a) and MrgX2, which somatostatin does not.
Functional comparison: Somatostatin is widely expressed throughout the brain and periphery and functions primarily as an inhibitory hormone (suppressing GH, insulin, glucagon, and gastric acid). Cortistatin is cortex-restricted in the brain and has distinct functions in sleep promotion and immune regulation that somatostatin does not share.
| Feature | Cortistatin-14 | Somatostatin-14 |
|---|---|---|
| Sequence | PCKNFFWKTFSSCK | AGCKNFFWKTFTSC |
| Gene | CORT (chromosome 1) | SST (chromosome 3) |
| CNS expression | Cortex/hippocampus only | Widespread |
| Sleep effects | Promotes slow-wave sleep | No direct sleep effects |
| GHSR-1a binding | Yes | No |
| Anti-inflammatory | Potent | Modest |
| Hormonal inhibition | Yes (via sst receptors) | Yes (primary function) |
Ghrelin#
Ghrelin is a 28-amino-acid peptide that is the endogenous ligand for GHSR-1a, the receptor that cortistatin uniquely shares.
Receptor overlap: Both cortistatin and ghrelin activate GHSR-1a, but through different binding sites and with different functional consequences. Ghrelin activates GHSR-1a in the hypothalamus to stimulate appetite and GH release, while cortistatin's GHSR-1a activation may contribute to its immune-modulatory effects.
Functional differences: Ghrelin is primarily a hunger hormone and GH secretagogue, while cortistatin is a sleep-promoting and anti-inflammatory neuropeptide. Their shared GHSR-1a activation creates complex pharmacological interactions.
Orexin-A and Orexin-B#
The orexin neuropeptides (orexin-A, 33 amino acids; orexin-B, 28 amino acids) are wake-promoting neuropeptides that function in opposition to cortistatin's sleep-promoting effects.
Sleep-wake axis: Cortistatin promotes slow-wave sleep by enhancing EEG synchronization and opposing cholinergic arousal. Orexins promote wakefulness by activating OX1R and OX2R on arousal-promoting neurons. Together, they represent complementary arms of the sleep-wake regulatory system.
Clinical development: Orexin biology has been successfully targeted clinically through both antagonists (suvorexant, lemborexant for insomnia) and agonists (oveporexton for narcolepsy), while cortistatin-based therapeutics remain preclinical.
Vasoactive Intestinal Peptide (VIP)#
VIP is another neuropeptide with both neurological and anti-inflammatory properties.
Anti-inflammatory comparison: Both cortistatin and VIP suppress pro-inflammatory cytokines, promote Treg generation, and show therapeutic efficacy in IBD and arthritis models. They appear to act through complementary but distinct receptor pathways.
Clinical relevance: Neither has progressed to clinical development for inflammatory indications, though both have robust preclinical evidence bases.
Summary Comparison#
| Feature | Cortistatin | Somatostatin | Ghrelin | Orexins |
|---|---|---|---|---|
| Sleep effects | Promotes SWS | None | Modulates sleep architecture | Promotes wakefulness |
| Anti-inflammatory | Potent | Modest | Modest | Minimal |
| sst receptor binding | Yes (all 5) | Yes (all 5) | No | No |
| GHSR-1a binding | Yes | No | Yes (primary) | No |
| OX receptor binding | No | No | No | Yes (primary) |
| Clinical development | None | Approved analogs | Approved analogs | Antagonists and agonists approved/NDA |
| Expression | Cortex/hippocampus | Widespread | Stomach/hypothalamus | Lateral hypothalamus |
Related Reading#
Frequently Asked Questions About Cortistatin
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