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Stereoselective suppression of neutrophil function by ketamine?
M Weiss1, A Birkhahn, S Mettler
1Department of Anesthesiology, Heinrich-Heine-Universität, Düsseldorf, Germany.
Immunopharmacology and Immunotoxicology
|February 1, 1995
Summary
Ketamine and its enantiomers suppress polymorphonuclear cell (PMN) chemiluminescence, indicating their effects on oxygen radical production are not due to specific receptor interactions.
Area of Science:
- Immunology
- Pharmacology
Background:
- Polymorphonuclear cells (PMN) are crucial in immune responses.
- Ketamine is an anesthetic with known immunomodulatory effects.
- Understanding ketamine's impact on PMN function is important for clinical applications.
Purpose of the Study:
- To investigate the effects of ketamine, its racemate, and enantiomers on PMN oxygen radical production.
- To determine if ketamine's effects on PMN are mediated by specific receptor interactions.
Main Methods:
- Examined N-formyl-methionyl-leucyl-phenylalanine (FMLP)-induced oxygen radical production in PMN.
- Assessed zymosan-induced oxygen radical production in PMN.
- Measured chemiluminescence as an indicator of oxygen radical production.
Main Results:
- Ketamine, its racemate, and enantiomers (R(-) and S(+)) suppressed PMN chemiluminescence.
- Suppression was dose-dependent and occurred to the same extent for all ketamine forms tested.
- The drug-free solvent had no effect on PMN chemiluminescence.
Conclusions:
- Ketamine's suppression of PMN chemiluminescence is not dependent on specific receptor interactions.
- The effects of ketamine on PMN oxygen radical production are likely due to non-specific mechanisms.
- Further research is needed to elucidate the precise non-specific pathways involved.