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Zileuton Reduces Inflammatory Reaction and Brain Damage Following Permanent Cerebral Ischemia in Rats

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Abstract

5-Lipoxygenase inhibitor zileuton has been demonstrated to attenuate ischemic brain damage in rats of permanent focal cerebral ischemia in previous work. To further investigate the mechanism underlying zileuton's neuroprotection, adult male Sprague-Dawley rats underwent permanent middle cerebral artery occlusion (MCAO), then received treatment with zileuton or vehicle after the onset of ischemia. Neurological deficit, cerebral infarction, and morphological characteristic were measured 6 and 24 h after MCAO. The enzymatic activity of myeloperoxidase (MPO) was assessed 6 and 24 h after MCAO and the lipid peroxidation levels were evaluated by malondialdehyde assay. Expression of nuclear factor-kappa B (NF-κB) p65 in rat brain was detected by immunohistochemistry and Western blot. Expression of inducible nitric oxide synthase (iNOS) in rat brain was determined by RT-PCR and Western blot. Nitric oxide production in rat brain was also measured 24 h after MCAO. The concentration of TNF-α and IL-1β in serum were detected by ELISA. Zileuton significantly reduced neurological deficit scores, cerebral infarct volume, MPO activity, and the lipid peroxidation levels. It also inhibited the expression of NF-κB and decreased the expression and activity of iNOS in rat brain. In addition, zileuton attenuated the release of TNF-α and IL-1β in serum. Our results suggest that zileuton reduces inflammatory reaction and brain damage in a rat model of permanent focal cerebral ischemia. The neuroprotective effect of zileuton in cerebral ischemia might be associated with the inhibition of inflammatory reaction.

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Acknowledgements

The key laboratory (Neurosurgical Department) funding from the Affiliated Union Hospital of Fujian Medical University, and the Professor Academic Development Fund of Fujian Medical University (JS0610), supported this work.

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Authors and Affiliations

  1. Department of Neurosurgery, The Affiliated Union Hospital of Fujian Medical University, 29# Xinquan Road, Fuzhou, Fujian, 350001, China

    Xian-kun Tu, Wei-zhong Yang, Chun-hua Wang, Song-sheng Shi, Yong-liang Zhang, Chun-mei Chen, Yi-kun Yang, Chang-dan Jin & Shuai Wen

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  1. Xian-kun Tu
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Correspondence to Wei-zhong Yang.

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Tu, Xk., Yang, Wz., Wang, Ch. et al. Zileuton Reduces Inflammatory Reaction and Brain Damage Following Permanent Cerebral Ischemia in Rats. Inflammation 33, 344–352 (2010). https://doi.org/10.1007/s10753-010-9191-6

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