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- W432821372 abstract "Background Imiquimod is an imidazoquinoline, which class of compounds are known to have antiviral and antitumoural properties. In recent studies, it was shown that imiquimod modulates the T helper cell type Thl/Th2 response by inducing the production of Thl cytokines like IFN-γ, and by inhibiting the Th2 cytokines like interleukin (IL)-4. Several investigators have shown that T-bet and GATA-3 are master Thl and Th2 regulatory transcription factors. This study investigated whether imiquimod treatment inhibited airway inflammation by modulating transcription factors T-bet and GATA-3. Methods Thirty-six male SD rats were randomly divided into a control group, an asthmatic group, and an imiquimod group, which was exposed to an aerosol of 0.15% imiquimod. Twenty-four hours after the last ovalbumin (OVA) challenge, airway responsiveness was measured and changes in airway histology were observed. The concentrations of IL-4, IL-5 and IFN-γ in bronchoalveolar lavage fluid (BALF) and serum were measured by enzyme linked immunosorbent assay (ELISA). The mRNA expressions of IL-4, IL-5, IFN-γ, T-bet and GATA-3 in lung and in CD4+ T cells were determined by reverse transcription polymerase chain reaction (RT-PCR). The protein expressions of T-bet and GATA-3 were measured by Western blot. Results It was demonstrated that imiquimod 1) attenuated OVA induced airway inflammation; 2) diminished the degree of airway hyperresponsiveness (AHR); 3) decreased the Th2 type cytokines and increased Thl type cytokines mRNA and protein levels; 4) modulated the Thl/Th2 reaction by inhibiting GATA-3 production and increasing T-bet production. Conclusion Imiquimod treatment inhibits OVA induced airway inflammation by modulating key master switches GATA-3 and T-bet that result in committing T helper cells to a Th1 phenotype." @default.
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- W432821372 date "2006-04-01" @default.
- W432821372 modified "2023-10-17" @default.
- W432821372 title "Treatment of allergic airway inflammation and hyperresponsiveness by imiquimod modulating transcription factors T-bet and GATA-3" @default.
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- W432821372 doi "https://doi.org/10.1097/00029330-200604020-00005" @default.
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