Pain & Nociception Peptides
Research peptides involved in pain signaling, nociceptive modulation, analgesic pathways, and neuroinflammatory pain conditions.
Pain & Nociception Peptides
This category covers peptides researched for their roles in pain perception, nociceptive signaling, and analgesic effects. Pain peptides act through diverse mechanisms including opioid receptor modulation, neuroinflammation reduction, nerve regeneration, and ion channel regulation.
Complete Peptide Directory
| Peptide | Description | Primary Mechanism |
|---|---|---|
| Ziconotide | Cone snail venom-derived peptide for severe chronic pain; FDA-approved (Prialt) | N-type calcium channel blocker; intrathecal delivery; non-opioid analgesic |
| Deltorphin | Frog-derived peptide with high selectivity for delta-opioid receptors | Delta-opioid receptor agonist; analgesic without respiratory depression risk |
| Endomorphin-1 | Endogenous tetrapeptide with highest mu-opioid receptor selectivity known | Mu-opioid receptor agonist; spinal and supraspinal analgesia |
| Endomorphin-2 | Endogenous tetrapeptide with high mu-opioid receptor affinity | Mu-opioid receptor agonist; peripheral and spinal pain modulation |
| Met-Enkephalin | Endogenous opioid pentapeptide involved in pain and immune regulation | Delta and mu-opioid receptor agonist; natural pain modulation system |
| Leu-Enkephalin | Endogenous opioid pentapeptide with delta-opioid receptor preference | Delta-opioid receptor agonist; endogenous analgesic system |
| Dynorphin A | Endogenous opioid peptide with kappa-opioid receptor selectivity | Kappa-opioid receptor agonist; stress-induced analgesia; spinal pain |
| Cortistatin | Neuropeptide related to somatostatin with distinct analgesic properties | Somatostatin receptor and MrgX2 receptor; anti-inflammatory and analgesic |
Common Research Themes
Opioid Receptor Subtypes: The endogenous opioid peptides target distinct receptor subtypes — Endomorphin-1/2 (mu), Met/Leu-Enkephalin (delta), and Dynorphin A (kappa) — each producing different analgesic profiles and side-effect patterns.
Non-Opioid Analgesia: Ziconotide represents a completely non-opioid mechanism (calcium channel blockade) for severe pain, avoiding the addiction and tolerance risks of opioid pathways.
Delta-Opioid Promise: Deltorphin and Leu-Enkephalin target delta-opioid receptors, which produce analgesia with less respiratory depression and lower addiction potential than mu-opioid agonists, making this pathway a major research target.
Nociception Complexity: Pain involves both peripheral and central mechanisms. These peptides modulate pain at multiple levels — from peripheral nerve signaling (Met-Enkephalin) to spinal cord processing (Ziconotide) to supraspinal integration (Endomorphin-1).
Getting Started
If you are new to this category, we recommend starting with Ziconotide — the only FDA-approved peptide analgesic, representing a non-opioid mechanism for severe pain. From there, explore related peptides through the See Also sections on each page to build a comprehensive understanding of the research landscape.
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