In vitro effect of benzodiazepines on polymorphonuclear leukocyte oxidative activity
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Abstract:
The effect of three benzodiazepine compounds, diazepam, flunitrazepam, and clorazepate, on oxidative activity of human polymorphonuclear leukocyte (PMN) was investigated. The oxidative activity of zymosan-stimulated PMN in the presence of three concentrations (10, 20, and 40 micrograms/ml) of these compounds was measured polarographically. In addition, zymosan-stimulated nitroblue tetrazolium (NBT) reduction was measured in the presence of various concentrations of flunitrazepam. All three compounds inhibited oxygen consumption of the PMN. The extent of inhibition was linear with respect to log-concentrations; oxygen consumption was reduced 50% for concentrations of diazepam, flunitrazepam, and clorazepate of 13 micrograms/ml, 56 micrograms/ml, and 285 micrograms/ml, respectively. In addition 30% and 100% inhibition of NBT reduction by flunitrazepam were observed at respective concentrations of 10 micrograms/ml and 60 micrograms/ml. The clinical relevance of these findings remains to be determined.
Insights
Benzodiazepines like diazepam, flunitrazepam, and clorazepate inhibit human polymorphonuclear leukocyte (PMN) oxidative activity. These compounds reduce PMN oxygen consumption and nitroblue tetrazolium reduction, indicating potential immune system effects.
Area of Science:
- Immunology
- Pharmacology
- Biochemistry
Background:
- Human polymorphonuclear leukocytes (PMNs) are crucial immune cells.
- Oxidative activity in PMNs plays a key role in host defense.
- Benzodiazepines are commonly prescribed psychoactive medications.
Purpose of the Study:
- To investigate the impact of diazepam, flunitrazepam, and clorazepate on PMN oxidative activity.
- To quantify the dose-dependent effects of these benzodiazepines on PMN function.
Main Methods:
- Measurement of oxygen consumption in zymosan-stimulated human PMNs using polarography.
- Assessment of nitroblue tetrazolium (NBT) reduction in PMNs exposed to varying flunitrazepam concentrations.
Main Results:
- All three tested benzodiazepines (diazepam, flunitrazepam, clorazepate) demonstrated inhibition of PMN oxygen consumption.
- Inhibition of oxygen consumption was dose-dependent, with IC50 values of 13, 56, and 285 µg/ml for diazepam, flunitrazepam, and clorazepate, respectively.
- Flunitrazepam significantly inhibited NBT reduction in a dose-dependent manner, showing 30% and 100% inhibition at 10 and 60 µg/ml, respectively.
Conclusions:
- Benzodiazepines can suppress the oxidative activity of human polymorphonuclear leukocytes.
- The findings suggest a potential modulatory effect of these drugs on innate immune cell function.
- Further research is needed to determine the clinical significance of these observed immunomodulatory effects.