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- W4242945764 abstract "Abstract Backgroud To explore the Effect of grape seed proanthocyanidin extract（GSPE） in peripheral blood mononuclear cells of severe asthmatic patients. Methods 40 severe asthmatic patients were randomly and averagely divided into 2 groups: DXM group (n=20) and GSPE+DXM group (n=20), and 20 healthy volunteers as control gorup. Heparinized peripheral venous blood from each subject was collected in a sterile vacuum tube. The levels of interleukin (IL)-8 and monocyte chemotactic protein (MCP)-1 were detected by ELISA. The protein and mRNA expressions of Nuclear factor erythroid 2-related factor 2 (Nrf2), glutamatecysteine ligase modifier subunit (GCLM) inducible nitric oxide synthase (iNOS) and inactivation of histone deacetylase-2 (HDAC2) were detected by Western blot and qRT-PCR respectively. Glutathion(GSH) was measured by using Glutathione Fluorometric Detection Kit, and Nrf2-ARE binding ability was measured by using TransAM Nrf2 Transcription Factor ELISA Kit. Results The results showed that the levels of IL-8 and MCP-1 in normal control group were lower than those in severe asthma group (P <0.05). Treatment with GSPE+DXM reduced the levels of IL-8 and MCP-1 significantly when compared with DXM only ( P <0.05).The mRNA expression of iNOS in DXM group was significantly higher than that in control group. However, after adding GSPE treatment, the expression dramatically decreased ( P <0.001). On the contrary, lower mRNA expressions of Nrf2, GCLM and HDAC2 were found in DXM group than in control group ( P <0.001). Accordingly, when treated with GSPE, these expressions elevated and reached a statistical significance ( P <0.05). Consistently, the results from western blot analysis confirmed the role of GSPE on the protein expressions of iNOS, Nrf2, GCLM and HDAC2 in PBMCs of patients with severe asthma ( P <0.001). The PBMCs from patients with severe asthma exhibited lower Nrf2-ARE binding ability and produced less GSH than normal controls. GSPE treatment effectively augmented the Nrf2-ARE binding ability and the expression of GSH, which demonstrated the biological antioxidant potential of GSPE ( P <0.001). Conclusion GSPE can alleviate glucocorticoid resistance by regulating Nrf2-iNOS-HDAC2 signaling pathway in severe asthma, suggesting that GSPE have potential clinical application prospects in the treatment of severe asthma." @default.
- W4242945764 created "2022-05-12" @default.
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- W4242945764 date "2019-10-07" @default.
- W4242945764 modified "2023-09-26" @default.
- W4242945764 title "Effect of grape seed proanthocyanidin extract in peripheral blood mononuclear cells of severe asthmatic patients" @default.
- W4242945764 doi "https://doi.org/10.21203/rs.2.15812/v1" @default.
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