Summary
Hydroxyhydroquinone or 1,2,4-benzenetriol (BT) detected in the beverages has a structure that coincides with the water-soluble form of a sesame lignan, sesamol. We previously showed that sesame antioxidants had neuroprotective abilities due to their antioxidant properties and/or inducible nitric oxide synthase (iNOS) inhibition. However, studies show that BT can induce DNA damage through the generation of reactive oxygen species (ROS). Therefore, we were interested to investigate the neuroprotective effect of BT in vitro and in vivo. The results showed that instead of enhancing free radical generation, BT dose-dependently (10–100 μM) attenuated nitrite production, iNOS mRNA and protein expression in lipopolysaccharide (LPS)-stimulated murine BV-2 microglia. BT significantly reduced LPS-induced NF-κB and p38 MAPK activation. It also significantly reduced the generation of ROS in H2O2-induced BV-2 cells and in H2O2-cellfree conditions. The neuroprotective effect of BT was further demonstrated in the focal cerebral ischemia model of Sprague–Dawley rat. Taken together, the inhibition of LPS-induced nitrite production might be due to the suppression of NF-κB, p38 MAPK signal pathway and the ROS scavenging effect. These effects might help to protect neurons from the ischemic injury.
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Acknowledgements
This study was supported by NSC912320B075A003 grant from the National Science Council of ROC (K.C.J.).
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Hou, R.CW., Chen, YS., Chen, CH. et al. Protective effect of 1,2,4-benzenetriol on LPS-induced NO production by BV2 microglial cells. J Biomed Sci 13, 89–99 (2006). https://doi.org/10.1007/s11373-005-9039-5
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DOI: https://doi.org/10.1007/s11373-005-9039-5