Abstract:
:H1-antihistamines are known to be important modulators of inflammatory response. However, the information about the influence of these drugs on reactive nitrogen species generation is still controversial. The main aim of the present study was to investigate the effects of selected H1-antihistamines on nitric oxide production by lipopolysaccharide-stimulated murine macrophages RAW 264.7, measured as changes in inducible nitric oxide synthase (iNOS) protein expression in cell lysates by Western blotting and nitrite formation in cell supernatants using the Griess reaction. In pharmacological non-toxic concentrations, H1-antihistamines significantly inhibited nitrite accumulation that was not caused by the scavenging ability of drugs against nitric oxide, measured amperometrically. The degree of inhibition of nitrite accumulation positively correlated with the degree of tested lipophilicity, measured by reversed-phase thin layer chromatography. Furthermore, H1-antihistamines differentially modulated the iNOS protein expression. In conclusion, as was shown in this study, the modulation of nitric oxide production could be caused by the downregulation of iNOS protein expression and/or the iNOS protein activity.
journal_name
Int Immunopharmacoljournal_title
International immunopharmacologyauthors
Králová J,Racková L,Pekarová M,Kubala L,Nosál R,Jancinová V,Cíz M,Lojek Adoi
10.1016/j.intimp.2009.04.005subject
Has Abstractpub_date
2009-07-01 00:00:00pages
990-5issue
7-8eissn
1567-5769issn
1878-1705pii
S1567-5769(09)00136-2journal_volume
9pub_type
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