Possible Protective Effect of Regulatory T cells on White Matter Microstructural Abnormalities in Stroke Patients
|Fumihiko Yasuno1,2*, Akihiko Taguchi3,4, Akie Kikuchi-Taura5, Akihide Yamamoto2, Hiroaki Kazui6, Takashi Kudo6, Atsuo Sekiyama7,
Katsufumi Kajimoto3, Toshihiro Soma5, Toshifumi Kishimoto1, Hidehiro Iida2 and Kazuyuki Nagatsuka3
|1 Department of Neuropsychiatry, Nara Medical University, Kashihara, Japan|
|2 Department of Investigative Radiology, National Cerebral and Cardiovascular Center, Suita, Japan|
|3 Department of Neurology, National Cerebral and Cardiovascular Center, Suita, Japan|
|4 Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation, Kobe, Japan|
|5 Division of Hematology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan|
|6 Department of Neuropsychiatry, Osaka University Medical School, Suita, Japan|
|7 Department of Brain Science, Osaka City University Graduate School of Medicine, Osaka, Japan|
|Corresponding Author :||Fumihiko Yasuno , M.D., Ph.D
Department of Psychiatry
Nara Medical University, 840 Shijocho
Kashihara, Nara, 634-8522, Japan
E-mail: [email protected]
|Received April 20, 2014; Accepted June 02, 2014; Published June 09, 2014|
|Citation: Yasuno F, Taguchi A, Kikuchi-Taura A, Yamamoto A, Kazui H, et al. (2014) Possible Protective Effect of Regulatory T cells on White Matter Microstructural Abnormalities in Stroke Patients. J Clin Cell Immunol 5:221. doi: 10.4172/2155-9899.1000221|
|Copyright: © 2014 Yasuno F, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
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Background: Despite advances in the understanding of stroke, therapeutic options for stroke are limited. Inflammatory mechanisms activated after brain ischemia are a key target of translational cerebrovascular research. The purpose of the present study was to investigate the existence of microstructure abnormalities in the white matter of stroke patients and their relationship to lymphocyte subsets.
Methods: The study included 18 patients with acute ischemic stroke and 22 healthy subjects. Diffusion tensor scans with magnetic resonance imaging were performed. Whole brain voxel-based analysis was used to compare fractional anisotropy (FA) in the stroke and healthy control groups. Blood samples were obtained from all subjects at the initial examination. The lymphocyte subsets in peripheral blood were evaluated with flow cytometric analysis. Helper T cells (CD3+ and CD4+), cytotoxic T cells (CD3+ and CD8+), B cells (CD19+), natural killer cells (CD16+ or CD56+), and regulatory T cells (Tregs) (CD4+, CD25+, and FOXP3+) were identified.
Results: In the voxel-based analysis, FA in the bilateral anterior limbs of the internal capsule was lower in stroke patients than in healthy subjects. These regions exhibited decreased axial diffusivity. The frequency of Tregs was lower in patients than in healthy controls. In patients, we found a significant positive relationship between the level of circulating Tregs and the FA value in the anterior limb of the internal capsule.
Conclusions: Patients exhibited a decreased frequency of circulating Tregs and the degree of reduction correlated with the decrease in the FA value in the internal capsule. Tregs might attenuate post-stroke white matter tissue damage by limiting the immune response. Our findings demonstrate the need for further study of the role of Tregs in the prevention of post-stroke cerebral damage.