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Advanced diffusion magnetic resonance imaging in patients with Alzheimer’s and Parkinson’s diseases

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Neural Regeneration Research 2020年第9期15卷 1590-1600页

作者： Koji Kamagata Christina Andica Taku Hatano Takashi Ogawa Haruka Takeshige-Amano Kotaro Ogaki Toshiaki Akashi Akifumi Hagiwara Shohei Fujita Shigeki Aoki Department of Radiology Juntendo University Graduate School of MedicineTokyoJapan Department of Neurology Juntendo University School of MedicineTokyoJapan

The prevalence of neurodegenerative diseases is increasing as human longevity increases. The objective biomarkers that enable the staging and early diagnosis of neurodegenerative diseases are eagerly anticipated. It has recently become possible to determine pathological changes in the brain without autopsy with the advancement of diffusion magnetic resonance imaging techniques. Diffusion magnetic resonance imaging is a robust tool used to evaluate brain microstructural complexity and integrity, axonal order, density, and myelination via the micron-scale displacement of water molecules diffusing in tissues. Diffusion tensor imaging, a type of diffusion magnetic resonance imaging technique is widely utilized in clinical and research settings;however, it has several limitations. To overcome these limitations, cutting-edge diffusion magnetic resonance imaging techniques, such as diffusional kurtosis imaging, neurite orientation dispersion and density imaging, and free water imaging, have been recently proposed and applied to evaluate the pathology of neurodegenerative diseases. This review focused on the main applications, findings, and future directions of advanced diffusion magnetic resonance imaging techniques in patients with Alzheimer's and Parkinson's diseases, the first and second most common neurodegenerative diseases, respectively.

关键词： Alzheimer's disease biomarkers diffusional kurtosis imaging disease progression early diagnosis free-water imaging neurites neurite orientation dispersion and density imaging Parkinson's disease

Effect of Rho-kinase pathway on neurite outgrowth of rat hippocampal neurons under atomic force microscopy

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Neural Regeneration Research 2012年第7期7卷 496-500页

作者： Jing Chen Hu Hao Guoqing Guo Sitao Li Xin Xiao Institute of Gastroenteroloav. Sixth A ffifiated Hospital of Sun Yat-sen University Guangzhou 510655 Guangdong Province China Laboratory of Inborn Errorsof Metabolism Sixth Affifiated Hospital of Sun Yat-sen University Guangzhou 510655 Guangdong ProvinceChina Department of Anatomy Medical College of Jinan University Guangzhou 510632 Guangdong Province China

Hippocampal neurons of neonatal rats were cultured in serum-free culture medium for 5 days in vitro, and treated with the Rho-kinase inducer lysophosphatidic acid. Atomic force microscopy revealed that the numbers of level-1, -2 and -3 neurites protruding from rat hippocampal neurons was significantly reduced. After treatment with the Rho kinase inhibitor Y27632, a significant increase in the numbers of these neurites was observed. Our experimental findings indicate that the Rho-kinase pathway is closely associated with the neurites of hippocampal neurons.

关键词： atomic force microscopy Rho-kinase nerve cells neurites hippocampus rats neural regeneration

Stereotactic Injection of shRNA GSK-3β-AAV Promotes Axonal Regeneration after Spinal Cord Injury

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2016年第4期36卷 548-553页

作者：左玉超熊南翔赵洪洋 Department of Neurosurgery Union Hospital Tongji Medical College Huazhong University of Science and Technology Department of Neurosurgery the First Affiliated Hospital of Zhengzhou University

Evidence suggested that glycogen synthase kinase-3β（GSK-3β） is involved in Nogo-66 inhibiting axonal regeneration in vitro, but its effect in vivo was poorly understood. We showed that stereotactic injection of sh RNA GSK-3β-adeno associated virus（GSK-3β-AAV） diminished syringomyelia and promoted axonal regeneration after spinal cord injury（SCI）, using stereotactic injection of sh RNA GSK-3β-AAV（tested with Western blotting and RT-PCR） into the sensorimotor cortex of rats with SCI and by the detection of biotin dextran amine（BDA）-labeled axonal regeneration. We also determined the right position to inject into the sensorimotor cortex. Our findings consolidate the hypothesis that downregulation of GSK-3β promotes axonal regeneration after SCI.

关键词： neurites wound healing protein-serine-threonine kinases myelin proteins

Effect of Y-27632 on the cultured retinal neurocytes of rats

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International Journal of Ophthalmology(English edition) 2013年第1期6卷 15-18页

作者： Pei-Li Feng Jing Wang Zi-Jian Yang Xiao-Hong Liu Yi-Sheng Zhong Department of Ophthalmology Ruijin Hospital Affiliated Medical SchoolShanghai Jiaotong University

AIM:To investigate the effect of Y-27632 on the survival and neurite outgrowth of the cultured retinal neurocytes. METHODS:After the postnatal day 2-3, Sprague-Dawley retinal neurocytes were cultured for 48 hours, the culture media was replaced with serum-free media (control group) and serum-free media contained 30μmol/L Y-27632 (Y-27632 group), and the cells were continually cultured another 48 hours. The cultured retinal neurocytes were identified with anti-neuron specific enolase (NSE) immunocytochemistry. The survival state of those cells was estimated by MTT assay, and the neurite outgrowth of those cells was evaluated by the computerized image-analysis system. RESULTS:Compared with the control group, the absorbance values of cells survival in Y -27632 group increased 12.90% and 33.33% respectively after 72 and 96 hours culture. Y-27632 had no significant effect on the diameter of cultured retinal neurocytes. Compared with the control group, Y-27632 induced a stable improvement of neurite outgrowth of retinal neurocytes after 72 and 96 hours culture (P =0.001). CONCLUSION:Y-27632 could promote the survival and neurite outgrowth of the early postnatal cultured retinal neurocytes.

关键词： Y-27632 retinal neurocytes cell culture neurites