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Ultralow concentrations of ibuprofen activate cell prostaglandin synthesis
M G Sergeeva1, M V Gonchar, V V Chistyakov
1A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Russia.
Abstract:
The interest in the prostaglandin (PG) synthesis by animal cells today grows steadily because of the difficulties in obtaining them by any other way. Murine peritoneal macrophages can under certain conditions synthesize large amounts of PGs. The effect of well-known nonsteroidal anti-inflammatory drug ibuprofen on PG synthesis by the cells using a high-performance liquid chromatography (HPLC) method with fluorescence detection of 4-bromomethyl-7-methoxy-coumarin (BrMMC) derivatives was studied. In our case, the main metabolites were PGE2 and PGF2a. The PG synthesis activation effect was shown by ibuprofen concentrations in the 10(-10)-10(-14) M range with the maximum effect of 10(-12)M. In this case, the ibuprofen effect was comparable in value with the effect of well-known cell PG synthesis activator--calcium ionophore A23187. Although the exact mechanism of such an effect is not clear at the moment, at low concentration, ibuprofen itself is able to activate PG synthesis in murine peritoneal macrophages.
Insights
The nonsteroidal anti-inflammatory drug ibuprofen, at very low concentrations, activates prostaglandin (PG) synthesis in murine peritoneal macrophages. This unexpected finding suggests ibuprofen may directly stimulate PG production, contrary to its usual inhibitory role.
Area of Science:
- Immunology
- Pharmacology
- Biochemistry
Background:
- Prostaglandin (PG) synthesis by animal cells is of increasing interest due to challenges in alternative sourcing.
- Murine peritoneal macrophages are known to synthesize significant amounts of PGs under specific conditions.
Purpose of the Study:
- To investigate the effect of the nonsteroidal anti-inflammatory drug (NSAID) ibuprofen on PG synthesis in murine peritoneal macrophages.
- To quantify PG metabolites using advanced analytical techniques.
Main Methods:
- Utilized a high-performance liquid chromatography (HPLC) method for precise quantification.
- Employed fluorescence detection with 4-bromomethyl-7-methoxy-coumarin (BrMMC) derivatives for analyzing PG metabolites.
- Studied the impact of various ibuprofen concentrations on macrophage PG synthesis.
Main Results:
- Ibuprofen demonstrated a PG synthesis activation effect within the concentration range of 10⁻¹⁰ to 10⁻¹⁴ M.
- The maximum activation was observed at an ibuprofen concentration of 10⁻¹² M.
- This activating effect was comparable to that of the known PG synthesis activator, calcium ionophore A23187.
- The primary PG metabolites identified were PGE2 and PGF2a.
Conclusions:
- Low concentrations of ibuprofen can directly activate prostaglandin synthesis in murine peritoneal macrophages.
- The precise mechanism underlying this activation by ibuprofen requires further investigation.
- This finding challenges the conventional understanding of NSAID mechanisms of action at the cellular level.