中国神经再生研究(英文版) ›› 2017, Vol. 12 ›› Issue (7): 1124-1130.doi: 10.4103/1673-5374.211192

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

局灶性脑缺血过程中信号转导与和转录激活因子3:再灌注弥散加权MRI的客观反映

  

  • 收稿日期:2017-04-14 出版日期:2017-07-15 发布日期:2017-07-15

Diffusion-weighted magnetic resonance imaging reflects activation of signal transducer and activator of transcription 3 during focal cerebral ischemia/reperfusion

Wen-juan Wu1, 2, Chun-juan Jiang1, Zhui-yang Zhang1, Kai Xu2, Wei Li1   

  1.  1 Department of Radiology, Nanjing Medical Unversity Affiliated Wuxi Second People’s Hospital, Wuxi, Jiangsu Province, China; 2 Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, China
  • Received:2017-04-14 Online:2017-07-15 Published:2017-07-15
  • Contact: Wei Li, 409631600@qq.com.

摘要:

脑缺血再灌注可激活信号转导和转录激活因子,但尚无研究证实弥散加权MRI验证脑缺血再灌注大鼠信号转导和转录激活因子的关系。实验采用线栓法建立局灶性脑缺血再灌注损伤大鼠模型,再灌注前大鼠损伤侧大脑呈弥散加权MRI高信号,且表观扩散系数较低,再灌注后DWI和表观扩散系数有所恢复,而损伤侧脑组织中信号转导和转录激活因子3表达在再灌注后无明显变化,但磷酸化信号转导和转录激活因子3水平在再灌注30 min后开始增加,24h时达到峰值。Pearson 分析得出信号转导和转录激活因子3活化与相对表观扩散系数呈正相关,与弥散加权MRI异常信号面积呈负相关。说明弥散加权MRI能客观反映脑缺血再灌注大鼠信号转导和转录激活因子3活化的情况与关系。

ORCID:0000-0002-3808-4399(Wei Li)

关键词: 神经再生, 脑缺血再灌注, MRI, 弥散加权成像, 信号转导与转录活化因子3, 磷酸化信号转导与转录活化因子3, 表观扩散系数, 相对表观扩散系数, 免疫组织化学, Western blot

Abstract:

Signal transducer and activator of transcription (STAT) is a unique protein family that binds to DNA, coupled with tyrosine phosphorylation signaling pathways, acting as a transcriptional regulator to mediate a variety of biological effects. Cerebral ischemia and reperfusion can activate STATs signaling pathway, but no studies have confirmed whether STAT activation can be verified by diffusion-weighted magnetic resonance imaging (DWI) in rats after cerebral ischemia/reperfusion. Here, we established a rat model of focal cerebral ischemia injury using the modified Longa method. DWI revealed hyperintensity in parts of the left hemisphere before reperfusion and a low apparent diffusion coefficient. STAT3 protein expression showed no significant change after reperfusion, but phosphorylated STAT3 expression began to increase after 30 minutes of reperfusion and peaked at 24 hours. Pearson correlation analysis showed that STAT3 activation was correlated positively with the relative apparent diffusion coefficient and negatively with the DWI abnormal signal area. These results indicate that DWI is a reliable representation of the infarct area and reflects STAT phosphorylation in rat brain following focal cerebral ischemia/reperfusion.

Key words: nerve regeneration, cerebral ischemia/reperfusion, magnetic resonance imaging, diffusion weighted imaging, signal transducer and activator of transcription 3, phosphorylated signal transducer and activator of transcription 3, apparent diffusion coefficient, relative apparent diffusion coefficient, immunohistochemistry, western blot assay, neural regeneration