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Wogonin Improves Histological and Functional Outcomes, and Reduces Activation of TLR4/NF-?B Signaling after Experimental Traumatic Brain Injury
Published: Tuesday, January 17, 2012
Author: Chien-Cheng Chen et al.

by Chien-Cheng Chen, Tai-Ho Hung, Yen-Ho Wang, Chii-Wann Lin, Pei-Yi Wang, Chun-Yen Lee, Szu-Fu Chen

Background

Traumatic brain injury (TBI) initiates a neuroinflammatory cascade that contributes to neuronal damage and behavioral impairment. This study was undertaken to investigate the effects of wogonin, a flavonoid with potent anti-inflammatory properties, on functional and histological outcomes, brain edema, and toll-like receptor 4 (TLR4)- and nuclear factor kappa B (NF-?B)-related signaling pathways in mice following TBI.

Methodology/Principal Findings

Mice subjected to controlled cortical impact injury were injected with wogonin (20, 40, or 50 mg·kg-1) or vehicle 10 min after injury. Behavioral studies, histology analysis, and measurement of blood-brain barrier (BBB) permeability and brain water content were carried out to assess the effects of wogonin. Levels of TLR4/NF-?B-related inflammatory mediators were also examined. Treatment with 40 mg·kg-1 wogonin significantly improved functional recovery and reduced contusion volumes up to post-injury day 28. Wogonin also significantly reduced neuronal death, BBB permeability, and brain edema beginning at day 1. These changes were associated with a marked reduction in leukocyte infiltration, microglial activation, TLR4 expression, NF-?B translocation to nucleus and its DNA binding activity, matrix metalloproteinase-9 activity, and expression of inflammatory mediators, including interleukin-1ß, interleukin-6, macrophage inflammatory protein-2, and cyclooxygenase-2.

Conclusions/Significance

Our results show that post-injury wogonin treatment improved long-term functional and histological outcomes, reduced brain edema, and attenuated the TLR4/NF-?B-mediated inflammatory response in mouse TBI. The neuroprotective effects of wogonin may be related to modulation of the TLR4/NF-?B signaling pathway.

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