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Updated: Feb 28, 2026
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Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
Published on: July 29, 2014
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Novel Opioid Analgesics and Side Effects.
Giovanna Del Vecchio1, Viola Spahn1, Christoph Stein1
1Department of Anesthesiology and Critical Care Medicine, Charité- Campus Benjamin Franklin , Hindenburgdamm 30, Berlin 12203, Germany.
ACS Chemical Neuroscience
|June 13, 2017
Summary
New opioid compounds selectively target pain at injury sites, avoiding dangerous side effects. This novel approach uses pH-specific activation of opioid receptors (OR) for safer pain management.
Area of Science:
- Pharmacology
- Pain Management
- Drug Design
Background:
- Conventional opioids activate G-protein coupled opioid receptors (OR) in both inflamed and healthy tissues, causing analgesia and severe adverse effects.
- Opioid receptor activation is mediated by G-proteins and is influenced by the pH of the surrounding environment.
Purpose of the Study:
- To develop a strategy for selective opioid receptor activation in inflamed tissues to mitigate side effects.
- To investigate a novel compound (NFEPP) for pH-specific pain blockade.
Main Methods:
- Lowering the pKa of an opioid ligand to match the acidic pH of inflammation for selective protonation.
- Utilizing a novel compound (NFEPP) designed for pH- and injury-specific opioid receptor activation.
- Assessing pain transmission blockade and adverse effects in both peripheral and central environments.
Main Results:
- NFEPP demonstrated successful blockade of pain transmission exclusively at the peripheral injury site.
- The compound exhibited a lack of central and gastrointestinal adverse effects, unlike conventional opioids.
- Selective protonation of the ligand at acidic pH enabled injury-specific receptor binding and G-protein activation.
Conclusions:
- Disease-specific receptor activation by modulating ligand pKa is a feasible strategy for targeted drug design.
- NFEPP represents a proof-of-concept for developing safer analgesics with reduced side effect profiles.
- This approach offers a new paradigm for creating therapeutics that target specific disease states.
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