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Effects of (D-Ala2)methionine enkephalinamide in PMA-induced mouse ear edema
O Rickinger1, H Sheriff, R Hirschelmann
1Department of Pharmacy, Martin-Luther-Universität Halle-Wittenberg, Germany.
Abstract:
The synthetic opioid peptide (D-Ala2) methionine enkephalinamide (DAMEA) was reported to be an extremely potent inhibitor of the "respiratory burst" of polymorphonuclear neutrophils (PMNs). In the present paper the activity of DAMEA was investigated in the PMA-induced mouse ear edema since there is strong evidence that reactive oxygen species (ROS) are involved in the pathogenesis of this inflammatory reaction. DAMEA inhibited PMA-induced mouse ear edema in a dose-dependent manner between 10(-6) and 10(-9) mol/ear. The well-known anti-inflammatory activity of narcotic analgesics could be explained partly by an inhibition of ROS production.
Insights
The synthetic opioid peptide DAMEA effectively reduced inflammation in a mouse model. This suggests that inhibiting reactive oxygen species (ROS) may be a key mechanism behind the anti-inflammatory effects of certain analgesics.
Area of Science:
- Pharmacology
- Immunology
- Inflammation Research
Background:
- The synthetic opioid peptide (D-Ala2) methionine enkephalinamide (DAMEA) is a potent inhibitor of polymorphonuclear neutrophil (PMN) respiratory burst.
- Reactive oxygen species (ROS) play a significant role in the pathogenesis of inflammatory reactions.
Purpose of the Study:
- To investigate the anti-inflammatory activity of DAMEA in a mouse model of inflammation.
- To explore the potential role of ROS inhibition in DAMEA's anti-inflammatory effects.
Main Methods:
- DAMEA's efficacy was tested in a phorbol 12-myristate 13-acetate (PMA)-induced mouse ear edema model.
- Dose-dependent inhibition of edema by DAMEA was evaluated.
Main Results:
- DAMEA demonstrated a dose-dependent inhibition of PMA-induced mouse ear edema.
- The inhibitory effect was observed within the concentration range of 10(-6) to 10(-9) mol/ear.
Conclusions:
- DAMEA exhibits significant anti-inflammatory properties in the studied model.
- Inhibition of ROS production may contribute to the anti-inflammatory activity of DAMEA and potentially other narcotic analgesics.