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Ding G, Li L, Chopp M, Zhang L, Li Q, Luo H, Wei M, Zhang J, Boyd E, Zhang Z, Jiang Q. Velocity of cerebrospinal fluid in the aqueduct measured by phase-contrast MRI in rat. NMR IN BIOMEDICINE 2024:e5233. [PMID: 39104053 DOI: 10.1002/nbm.5233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 04/15/2024] [Accepted: 07/22/2024] [Indexed: 08/07/2024]
Abstract
Cerebrospinal fluid (CSF) circulation plays a key role in cerebral waste clearance via the glymphatic system. Although CSF flow velocity is an essential component of CSF dynamics, it has not been sufficiently characterized, and particularly, in studies of the glymphatic system in rat. To investigate the relationship between the flow velocity of CSF in the brain aqueduct and the glymphatic waste clearance rate, using phase-contrast MRI we performed the first measurements of CSF velocity in rats. Phase-contrast MRI was performed using a 7 T system to map mean velocity of CSF flow in the aqueduct in rat brain. The effects of age (3 months old versus 18 months old), gender, strain (Wistar, RNU, Dark Agouti), anesthetic agents (isoflurane versus dexmedetomidine), and neurodegenerative disorder (Alzheimer' disease in Fischer TgF344-AD rats, males and females) on CSF velocity were investigated in eight independent groups of rats (12 rats per group). Our results demonstrated that quantitative velocities of CSF flow in the aqueduct averaged 5.16 ± 0.86 mm/s in healthy young adult male Wistar rats. CSF flow velocity in the aqueduct was not altered by rat gender, strain, and the employed anesthetic agents in all rats, also age in the female rats. However, aged (18 months) Wistar male rats exhibited significantly reduced the CSF flow velocity in the aqueduct (4.31 ± 1.08 mm/s). In addition, Alzheimer's disease further reduced the CSF flow velocity in the aqueduct of male and female rats.
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Affiliation(s)
- Guangliang Ding
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Lian Li
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Michael Chopp
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
- Department of Physics, Oakland University, Rochester, MI, USA
| | - Li Zhang
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Qingjiang Li
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Hao Luo
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Min Wei
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Jing Zhang
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Edward Boyd
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Zhenggang Zhang
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
| | - Quan Jiang
- Department of Neurology, Henry Ford Hospital, Detroit, MI, USA
- Department of Physics, Oakland University, Rochester, MI, USA
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Huang SM, Wu CY, Lin YH, Hsieh HH, Yang HC, Chiu SC, Peng SL. Differences in brain activity between normal and diabetic rats under isoflurane anesthesia: a resting-state functional MRI study. BMC Med Imaging 2022; 22:136. [PMID: 35927630 PMCID: PMC9354416 DOI: 10.1186/s12880-022-00867-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 07/27/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Altered neural activity based on the fractional amplitude of low-frequency fluctuations (fALFF) has been reported in patients with diabetes. However, whether fALFF can differentiate healthy controls from diabetic animals under anesthesia remains unclear. The study aimed to elucidate the changes in fALFF in a rat model of diabetes under isoflurane anesthesia. METHODS The first group of rats (n = 5) received a single intraperitoneal injection of 70 mg/kg streptozotocin (STZ) to cause the development of diabetes. The second group of rats (n = 7) received a single intraperitoneal injection of the same volume of solvent. Resting-state functional magnetic resonance imaging was used to assess brain activity at 4 weeks after STZ or solvent administration. RESULTS Compared to the healthy control animals, rats with diabetes showed significantly decreased fALFF in various brain regions, including the cingulate cortex, somatosensory cortex, insula, and striatum (all P < 0.05). The decreased fALFF suggests the aberrant neural activities in the diabetic rats. No regions were detected in which the control group had a lower fALFF than that in the diabetes group. CONCLUSIONS The results of this study demonstrated that the fALFF could be used to differentiate healthy controls from diabetic animals, providing meaningful information regarding the neurological pathophysiology of diabetes in animal models.
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Affiliation(s)
- Sheng-Min Huang
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli, Taiwan
| | - Chun-Yi Wu
- Department of Biomedical Imaging and Radiological Sciences, Taipei Branch, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Yu-Hsin Lin
- Department of Pharmacy, Taipei Branch, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
| | - Hsin-Hua Hsieh
- Department of Biomedical Imaging and Radiological Sciences, Taipei Branch, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Hui-Chieh Yang
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, Taiwan
| | - Shao-Chieh Chiu
- Center for Advanced Molecular Imaging and Translation, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Shin-Lei Peng
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, Taiwan. .,Neuroscience and Brain Disease Center, China Medical University, Taichung, Taiwan.
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Zhou M, Li R, Venkat P, Qian Y, Chopp M, Zacharek A, Landschoot-Ward J, Powell B, Jiang Q, Cui X. Post-Stroke Administration of L-4F Promotes Neurovascular and White Matter Remodeling in Type-2 Diabetic Stroke Mice. Front Neurol 2022; 13:863934. [PMID: 35572941 PMCID: PMC9100936 DOI: 10.3389/fneur.2022.863934] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 03/21/2022] [Indexed: 02/02/2023] Open
Abstract
Patients with type 2 diabetes mellitus (T2DM) exhibit a distinct and high risk of ischemic stroke with worse post-stroke neurovascular and white matter (WM) prognosis than the non-diabetic population. In the central nervous system, the ATP-binding cassette transporter member A 1 (ABCA1), a reverse cholesterol transporter that efflux cellular cholesterol, plays an important role in high-density lipoprotein (HDL) biogenesis and in maintaining neurovascular stability and WM integrity. Our previous study shows that L-4F, an economical apolipoprotein A member I (ApoA-I) mimetic peptide, has neuroprotective effects via alleviating neurovascular and WM impairments in the brain of db/db-T2DM stroke mice. To further investigate whether L-4F has neurorestorative benefits in the ischemic brain after stroke in T2DM and elucidate the underlying molecular mechanisms, we subjected middle-aged, brain-ABCA1 deficient (ABCA1-B/-B), and ABCA1-floxed (ABCA1fl/fl) T2DM control mice to distal middle cerebral artery occlusion. L-4F (16 mg/kg, subcutaneous) treatment was initiated 24 h after stroke and administered once daily for 21 days. Treatment of T2DM-stroke with L-4F improved neurological functional outcome, and decreased hemorrhage, mortality, and BBB leakage identified by decreased albumin infiltration and increased tight-junction and astrocyte end-feet densities, increased cerebral arteriole diameter and smooth muscle cell number, and increased WM density and oligodendrogenesis in the ischemic brain in both ABCA1-B/-B and ABCA1fl/fl T2DM-stroke mice compared with vehicle-control mice, respectively (p < 0.05, n = 9 or 21/group). The L-4F treatment reduced macrophage infiltration and neuroinflammation identified by decreases in ED-1, monocyte chemoattractant protein-1 (MCP-1), and toll-like receptor 4 (TLR4) expression, and increases in anti-inflammatory factor Insulin-like growth factor 1 (IGF-1) and its receptor IGF-1 receptor β (IGF-1Rβ) in the ischemic brain (p < 0.05, n = 6/group). These results suggest that post-stroke administration of L-4F may provide a restorative strategy for T2DM-stroke by promoting neurovascular and WM remodeling. Reducing neuroinflammation in the injured brain may contribute at least partially to the restorative effects of L-4F independent of the ABCA1 signaling pathway.
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Affiliation(s)
- Min Zhou
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | - Rongwen Li
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | - Poornima Venkat
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | - Yu Qian
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | - Michael Chopp
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
- Department of Physics, Oakland University, Rochester, MI, United States
| | - Alex Zacharek
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | | | - Brianna Powell
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
| | - Quan Jiang
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
- Department of Physics, Oakland University, Rochester, MI, United States
| | - Xu Cui
- Department of Neurology, Henry Ford Hospital, Detroit, MI, United States
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Lesbats C, Kelly CL, Czanner G, Poptani H. Diffusion kurtosis imaging for characterizing tumor heterogeneity in an intracranial rat glioblastoma model. NMR IN BIOMEDICINE 2020; 33:e4386. [PMID: 32729637 DOI: 10.1002/nbm.4386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 07/14/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
The utility of diffusion kurtosis imaging (DKI) for assessing intra-tumor heterogeneity was evaluated in a rat model of glioblastoma multiforme. Longitudinal MRI including T2 -weighted and diffusion-weighted MRI (DWI) was performed on six female Fischer rats 8, 11 and 14 days after intracranial transplantation of F98 cells. T2 -weighted images were used to measure the tumor volumes and DWI images were used to compute diffusion tensor imaging (DTI) and DWI based parametric maps including mean diffusivity (MD), mean kurtosis (MK), axial diffusivity (AD), axial kurtosis, radial diffusivity, radial kurtosis, fractional anisotropy (FA) and kurtosis fractional anisotropy (KFA). Median values from the segmented normal contralateral cortex, tumor and edema from the diffusion parameters were compared at the three imaging time points to assess any changes in tumor heterogeneity over time. ex vivo DKI was also performed in a representative sample and compared with histology. Significant differences were observed between normal cortex, tumor and edema in both the DTI and DKI parameters. Notably, at the earliest time point MK and KFA were significantly different between normal cortex and tumor in comparison with MD or FA. Although a decreasing trend in MD, AD and FA values of the tumor were observed as the tumor grew, no significant changes in any of the DTI or DKI parameters were observed longitudinally. While DKI was equally sensitive to DTI in differentiating tumor from edema and normal brain, it was unable to detect longitudinal increases in intra-tumoral heterogeneity in the F98 model of glioblastoma multiforme.
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Affiliation(s)
- Clémentine Lesbats
- Centre for Preclinical Imaging, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
| | - Claire Louise Kelly
- Centre for Preclinical Imaging, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
| | - Gabriela Czanner
- Department of Applied Mathematics, Liverpool John Moores University, Liverpool, UK
| | - Harish Poptani
- Centre for Preclinical Imaging, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
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Emerging role of microRNAs in ischemic stroke with comorbidities. Exp Neurol 2020; 331:113382. [DOI: 10.1016/j.expneurol.2020.113382] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 06/07/2020] [Accepted: 06/14/2020] [Indexed: 02/06/2023]
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Ma S, Wang J, Wang Y, Dai X, Xu F, Gao X, Johnson J, Xu N, Leak RK, Hu X, Luo Y, Chen J. Diabetes Mellitus Impairs White Matter Repair and Long-Term Functional Deficits After Cerebral Ischemia. Stroke 2019; 49:2453-2463. [PMID: 30355111 DOI: 10.1161/strokeaha.118.021452] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Background and Purpose- Type 2 diabetes mellitus (T2DM) is a major comorbidity that exacerbates ischemic brain injury and worsens functional outcome after stroke. T2DM is known to aggravate white matter (WM) impairment, but the underlying mechanism is not completely understood. This study was designed to test the hypothesis that T2DM impedes poststroke WM recovery by suppressing both oligodendrogenesis and beneficial microglia/macrophage responses. Methods- Permanent distal middle cerebral artery occlusion was performed in wild-type, homozygous diabetic db/db, and heterozygous db/+ mice. The adhesive removal, open field, and Morris water maze tests were used to assess neurobehavioral outcomes. Neuronal tissue loss, WM damage, oligodendrogenesis, and microglia/macrophage responses were evaluated up to 35 days after stroke. The functional integrity of WM was measured by electrophysiology. Primary microglia-oligodendrocyte cocultures were used for additional mechanistic studies. Results- T2DM exacerbated structural damage and impaired conduction of compound action potentials in WM 35 days after stroke. The deterioration in WM integrity correlated with poor sensorimotor performance. Furthermore, T2DM impaired the proliferation of oligodendrocyte precursor cells and the generation of new myelinating oligodendrocytes. T2DM also promoted a shift of microglia/macrophage phenotype toward the proinflammatory modality. Coculture studies confirmed that microglia/macrophage polarization toward the proinflammatory phenotype under high glucose conditions suppressed oligodendrocyte precursor cell differentiation. Conclusions- Deterioration of WM integrity and impairments in oligodendrogenesis after stroke are associated with poor long-term functional outcomes in experimental diabetes mellitus. High glucose concentrations may shift microglia/macrophage polarization toward a proinflammatory phenotype, significantly impairing oligodendrocyte precursor cell differentiation and WM repair.
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Affiliation(s)
- Shubei Ma
- From the Institute of Cerebrovascular Disease Research and Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China (S.M., Y.L.).,Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Jianyi Wang
- Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Yanling Wang
- Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Xuejiao Dai
- Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Fei Xu
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Healthcare System, PA (F.X., X.H., J.C.).,Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Xuguang Gao
- Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Joycelyne Johnson
- Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Na Xu
- Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Rehana K Leak
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA (R.K.L.)
| | - Xiaoming Hu
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Healthcare System, PA (F.X., X.H., J.C.).,Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
| | - Yumin Luo
- From the Institute of Cerebrovascular Disease Research and Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China (S.M., Y.L.)
| | - Jun Chen
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Healthcare System, PA (F.X., X.H., J.C.).,Pittsburgh Institute of Brain Disorders and Recovery, and Department of Neurology, University of Pittsburgh School of Medicine, PA (S.M., J.W., Y.W., X.D., F.X., X.G., J.J., N.X., X.H., J.C.)
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Differences between normal and diabetic brains in middle-aged rats by MRI. Brain Res 2019; 1724:146407. [PMID: 31465773 DOI: 10.1016/j.brainres.2019.146407] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/23/2019] [Accepted: 08/24/2019] [Indexed: 01/01/2023]
Abstract
Normal aging is a risk factor for metabolic disorders such as diabetes, and diabetes is also a recognized cause of accelerated aging. Being able to distinguish changes caused by normal aging from those caused by diabetes, would provide insight into how the aging brain interacts with diabetes. Eight types of MRI metric maps (magnetization relaxation time constants of T1 and T2, cerebral blood flow, cerebrovascular permeability, mean diffusivity, diffusion fractional anisotropy, mean diffusion kurtosis and diffusion directional entropy) were generated for all rats from the three groups of normal young, healthy and 1.5-month diabetic middle-aged rats under investigation. Measurements of multiple MRI indices of cerebral white and gray matter from animals of the three groups provide complementary results and insight into differences between healthy and diabetic white / gray matter in the mid-aged rats. Our data indicate that MRI may distinguish between the normal and diabetes in mid-aged rat brains by measuring either T1 and T2 of gray matter, or fractional anisotropy of white matter and gray matter. Therefore, MRI can distinguish changes of cerebral tissue due to the normal aging from diabetic aging, which may lead to be able to better understand how diabetes accelerates aging in normal brain.
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Wang M, Hua X, Niu H, Sun Z, Zhang L, Li Y, Zhang L, Li L. Cornel Iridoid Glycoside Protects Against White Matter Lesions Induced by Cerebral Ischemia in Rats via Activation of the Brain-Derived Neurotrophic Factor/Neuregulin-1 Pathway. Neuropsychiatr Dis Treat 2019; 15:3327-3340. [PMID: 31819458 PMCID: PMC6898993 DOI: 10.2147/ndt.s228417] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 11/13/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Ischemic stroke often induces profound white matter lesions, resulting in poor neurological outcomes and impaired post-stroke recovery. The present study aimed to investigate the effects of cornel iridoid glycoside (CIG), a major active component extracted from Cornus officinalis, on the white matter injury induced by ischemic stroke and further investigate its neuroprotective mechanisms. METHODS Adult male Sprague-Dawley rats underwent middle cerebral artery occlusion (MCAO) surgery for 2 h, followed by reperfusion. Rats were intragastrically administered CIG (60 mg/kg and 120 mg/kg) beginning 6 h afters reperfusion, once daily for seven days. A series of behavioral tests (modified neurological severity scores test, object recognition test, adhesive removal test, and beam walking test) were performed to evaluate the neurological functioning in MCAO rats. Histology of the white matter was studied using luxol fast blue staining and transmission electron microscopy. Immunohistochemical staining was performed to assess myelin loss, oligodendrocyte maturation, and glial activation. Activation of the brain-derived neurotrophic factor (BDNF)/neuregulin-1 (NRG1) pathway was evaluated by Western blotting. RESULTS CIG treatment remarkably decreased the neurological deficit score, accelerated the recovery of somatosensory and motor functions, and ameliorated the memory deficit in MCAO rats. Furthermore, CIG alleviated white matter lesions and demyelination, increased myelin basic protein expression and the number of mature oligodendrocytes, and decreased the number of activated microglia and astrocytes in the corpus callosum of MCAO rats. In addition, Western blot analysis indicated that CIG increased the expression of BDNF/p-TrkB, NRG1/ErbB4 proteins, which further elevated PI3K p110α/p-Akt/p-mTOR signaling in the corpus callosum of MCAO rats. CONCLUSION We demonstrated that CIG protects against white matter lesions induced by cerebral ischemia partially by decreasing the number of activated microglia and astrocytes, increasing BDNF level, and activating NRG1/ErbB4 and its downstream PI3K/Akt/mTOR pathways in the white matter. CIG might be used as a potential neuroprotective agent for the treatment of ischemic stroke.
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Affiliation(s)
- Mingyang Wang
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
| | - Xuesi Hua
- University of Michigan, Ann Arbor, MI, USA
| | - Hongmei Niu
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
| | - Zhengyu Sun
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
| | - Li Zhang
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
| | - Yali Li
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
| | - Lan Zhang
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
| | - Lin Li
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing Institute for Brain Disorders, Beijing Engineering Research Center for Nerve System Drugs, Beijing, People's Republic of China
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Wang X, Xuan W, Zhu ZY, Li Y, Zhu H, Zhu L, Fu DY, Yang LQ, Li PY, Yu WF. The evolving role of neuro-immune interaction in brain repair after cerebral ischemic stroke. CNS Neurosci Ther 2018; 24:1100-1114. [PMID: 30350341 DOI: 10.1111/cns.13077] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 09/23/2018] [Accepted: 09/25/2018] [Indexed: 12/13/2022] Open
Abstract
Stroke is the world's leading cause of disability with limited brain repair treatments which effectively improve long-term neurological deficits. The neuroinflammatory responses persist into the late repair phase of stroke and participate in all brain repair elements, including neurogenesis, angiogenesis, synaptogenesis, remyelination and axonal sprouting, shedding new light on post-stroke brain recovery. Resident brain glial cells, such as astrocytes not only contribute to neuroinflammation after stroke, but also secrete a wide range of trophic factors that can promote post-stroke brain repair. Alternatively, activated microglia, monocytes, and neutrophils in the innate immune system, traditionally considered as major damaging factors after stroke, have been suggested to be extensively involved in brain repair after stroke. The adaptive immune system may also have its bright side during the late regenerative phase, affecting the immune suppressive regulatory T cells and B cells. This review summarizes the recent findings in the evolving role of neuroinflammation in multiple post-stroke brain repair mechanisms and poses unanswered questions that may generate new directions for future research and give rise to novel therapeutic targets to improve stroke recovery.
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Affiliation(s)
- Xin Wang
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Wei Xuan
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Zi-Yu Zhu
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Yan Li
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Hao Zhu
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Ling Zhu
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Dan-Yun Fu
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Li-Qun Yang
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Pei-Ying Li
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Wei-Feng Yu
- Department of Anesthesiology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
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Liu LQ, Liu XR, Zhao JY, Yan F, Wang RL, Wen SH, Wang L, Luo YM, Ji XM. Brain-selective mild hypothermia promotes long-term white matter integrity after ischemic stroke in mice. CNS Neurosci Ther 2018; 24:1275-1285. [PMID: 30295998 DOI: 10.1111/cns.13061] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 08/16/2018] [Accepted: 08/18/2018] [Indexed: 12/17/2022] Open
Abstract
INTRODUCTION The neuroprotective effects of hypothermia in acute ischemic stroke are well documented. However, the mechanisms involved in the effects remain to be clearly elucidated and the role of hypothermia on long-term white matter integrity after acute ischemic stroke has yet to be investigated. AIMS To investigate the role of mild focal hypothermia on long-term white matter (WM) integrity after transient cerebral ischemia. RESULTS Mild focal hypothermia treatment immediately after ischemic stroke significantly promotes WM integrity 28 days after the occlusion of the middle cerebral artery (MCAO) in mice. Higher integrity of white matter, lower activation of total microglia, less infarct volume, and better neurobehavioral function were detected in hypothermia-treated mice compared to normothermia-treated mice. Furthermore, we found that hypothermia could decrease detrimental M1 phenotype microglia and promote healthy M2 phenotype microglia. In vitro, results also indicated that hypothermia promoted oligodendrocytes differentiation and maturation after oxygen glucose deprivation. CONCLUSION Hypothermia promotes long-term WM integrity and inhibits neuroinflammation in a mouse model of ischemic brain injury.
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Affiliation(s)
- Li-Qiang Liu
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,Stroke Center, Beijing Institute for Brain Disorders, Beijing, China.,Beijing Key Laboratory of Hypoxia Conditioning Translational Medicine, Beijing, China.,Department of Neurology, Inner Mongolia Baogang Hospital, Baotou, Inner Mongolia, China
| | - Xiang-Rong Liu
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,China-America Joint Institute of Neuroscience, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Jing-Yan Zhao
- Stroke Center, Beijing Institute for Brain Disorders, Beijing, China.,China-America Joint Institute of Neuroscience, Xuanwu Hospital, Capital Medical University, Beijing, China.,Pittsburgh Institute of Brain Disorders & Recovery and Department of Neurology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Feng Yan
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Rong-Liang Wang
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Shao-Hong Wen
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,China-America Joint Institute of Neuroscience, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Lei Wang
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Yu-Min Luo
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Xun-Ming Ji
- Cerebrovascular Disease Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,Stroke Center, Beijing Institute for Brain Disorders, Beijing, China.,Beijing Key Laboratory of Hypoxia Conditioning Translational Medicine, Beijing, China.,Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China
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11
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Wang S, Li Y, Paudyal R, Ford BD, Zhang X. Evaluation of neuregulin-1's neuroprotection against ischemic injury in rats using diffusion tensor imaging. Magn Reson Imaging 2018; 53:63-70. [PMID: 30021123 DOI: 10.1016/j.mri.2018.07.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 07/11/2018] [Accepted: 07/14/2018] [Indexed: 12/11/2022]
Abstract
Stroke is a devastating neurovascular disorder that results in damage to neurons and white matter tracts. It has been previously demonstrated that neuregulin-1 (NRG-1) protects neurons from ischemic injury following stroke. Here, diffusion tensor imaging (DTI) was utilized to characterize the effects of NRG-1 treatment on cererbral infarction and integrity of white matter after ischemic insult using a permanent middle celebral artery occlusion (pMCAo) rat model. In the present study, sixteen Sprague-Dawley rats underwent pMCAo surgery and received either a single intra-arterial bolus (20 μg/kg) dose of NRG-1 or saline immediately prior to pMCAo. MRI including T2-weighted imaging and DTI was performed in the first 3 h post stroke, and repeated 48 h later. It is found that the stroke infarction was significantly reduced in the NRG-1 treated group. Also, NRG-1 prevented the reduction of fractional anisotropy (FA) in white matter tracts of fornix and corpus callosum (CC), indicating its protection of CC and fornix white matter bundles from ischemia insult. As a conclusion, the present DTI results demonstrate that NRG-1 has significantly neuroprotective effects in both cerebral cortex and white matter including corpus callosum and fornix during acute stroke. In particular, NRG-1 is more effective on stroke lesion with mild ischemia. As CC and fornix white matter bundles play critical roles in transcallosal connectivity and hippocampal projections respectively in the central nervous system, the findings could provide complementary information for better understanding the biological mechanism of NRG-1's neuroprotection in ischemic tissues and neurobehavioral effects.
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Affiliation(s)
- Silun Wang
- Yerkes Imaging Center, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road NE, Atlanta, GA 30329, USA
| | - Yonggang Li
- Division of Biomedical Sciences, University of California-Riverside School of Medicine, Riverside, CA 92521, USA
| | - Ramesh Paudyal
- Yerkes Imaging Center, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road NE, Atlanta, GA 30329, USA
| | - Byron D Ford
- Division of Biomedical Sciences, University of California-Riverside School of Medicine, Riverside, CA 92521, USA.
| | - Xiaodong Zhang
- Yerkes Imaging Center, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road NE, Atlanta, GA 30329, USA; Division of Neuropharmacology and Neurologic Diseases, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30329, USA.
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12
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Tong LS, Guo ZN, Ou YB, Yu YN, Zhang XC, Tang J, Zhang JH, Lou M. Cerebral venous collaterals: A new fort for fighting ischemic stroke? Prog Neurobiol 2017; 163-164:172-193. [PMID: 29199136 DOI: 10.1016/j.pneurobio.2017.11.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/03/2017] [Accepted: 11/28/2017] [Indexed: 12/13/2022]
Abstract
Stroke therapy has entered a new era highlighted by the use of endovascular therapy in addition to intravenous thrombolysis. However, the efficacy of current therapeutic regimens might be reduced by their associated adverse events. For example, over-reperfusion and futile recanalization may lead to large infarct, brain swelling, hemorrhagic complication and neurological deterioration. The traditional pathophysiological understanding on ischemic stroke can hardly address these occurrences. Accumulating evidence suggests that a functional cerebral venous drainage, the major blood reservoir and drainage system in brain, may be as critical as arterial infusion for stroke evolution and clinical sequelae. Further exploration of the multi-faceted function of cerebral venous system may add new implications for stroke outcome prediction and future therapeutic decision-making. In this review, we emphasize the anatomical and functional characteristics of the cerebral venous system and illustrate its necessity in facilitating the arterial infusion and maintaining the cerebral perfusion in the pathological stroke content. We then summarize the recent critical clinical studies that underscore the associations between cerebral venous collateral and outcome of ischemic stroke with advanced imaging techniques. A novel three-level venous system classification is proposed to demonstrate the distinct characteristics of venous collaterals in the setting of ischemic stroke. Finally, we discuss the current directions for assessment of cerebral venous collaterals and provide future challenges and opportunities for therapeutic strategies in the light of these new concepts.
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Affiliation(s)
- Lu-Sha Tong
- Department of Neurology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China; Departments of Physiology, Loma Linda University, School of Medicine, CA, USA
| | - Zhen-Ni Guo
- Department of Neurology, The First Affiliated Hospital of Jilin University, Changchun, China; Departments of Physiology, Loma Linda University, School of Medicine, CA, USA
| | - Yi-Bo Ou
- Department of Neurosurgery, Tong-ji Hospital, Wuhan, China; Departments of Physiology, Loma Linda University, School of Medicine, CA, USA
| | - Yan-Nan Yu
- Department of Neurology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
| | - Xiao-Cheng Zhang
- Department of Neurology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
| | - Jiping Tang
- Department of Anesthesiology, Loma Linda University, School of Medicine, CA, USA
| | - John H Zhang
- Departments of Physiology, Loma Linda University, School of Medicine, CA, USA.
| | - Min Lou
- Department of Neurology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
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13
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Schilling KG, Nath V, Blaber JA, Parvathaneni P, Anderson AW, Landman BA. Empirical consideration of the effects of acquisition parameters and analysis model on clinically feasible q-ball imaging. Magn Reson Imaging 2017; 40:62-74. [PMID: 28438712 PMCID: PMC5500983 DOI: 10.1016/j.mri.2017.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/19/2017] [Accepted: 04/20/2017] [Indexed: 11/17/2022]
Abstract
Q-ball imaging (QBI) is a popular high angular resolution diffusion imaging (HARDI) technique used to study brain architecture in vivo. Simulation and phantom-based studies suggest that QBI results are affected by the b-value, the number of diffusion weighting directions, and the signal-to-noise ratio (SNR). However, optimal acquisition schemes for QBI in clinical settings are largely undetermined given empirical (observed) imaging considerations. In this study, we acquire a HARDI dataset at five b-values with 11 repetitions on a single subject to investigate the effects of acquisition scheme and subsequent analysis models on the accuracy and precision of measures of tissue composition and fiber orientation derived from clinically feasible QBI at 3T. Clinical feasibility entails short scan protocols - less than 5minutes in the current study - resulting in lower SNR, lower b-values, and fewer diffusion directions than are typical in most QBI protocols with research applications, where time constraints are less prevalent. In agreement with previous studies, we find that the b-value and number of diffusion directions impact the magnitude and variation of QBI indices in both white matter and gray matter regions; however, QBI indices are most heavily dependent on the maximum order of the spherical harmonic (SH) series used to represent the diffusion orientation distribution function (ODF). Specifically, to ensure numerical stability and reduce the occurrence of false peaks and inflated anisotropy, we recommend oversampling by at least 8-12 more diffusion directions than the number of estimated coefficients for a given SH order. In addition, in an equal scan time comparison of QBI accuracy, we find that increasing the directional resolution of the HARDI dataset is preferable to repeating observations; however, our results indicate that as few as 32 directions at a low b-value (1000s/mm2) captures most of the angular information in the q-ball ODF. Our findings provide guidance for determining an optimal acquisition scheme for QBI in the low SNR and low scan time regime, and suggest that care must be taken when choosing the basis functions used to represent the QBI ODF.
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Affiliation(s)
- Kurt G Schilling
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA; Vanderbilt University, Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA.
| | - Vishwesh Nath
- Computer Science, Vanderbilt University, Nashville, TN, USA
| | | | - Prasanna Parvathaneni
- Computer Science, Vanderbilt University, Nashville, TN, USA; Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Adam W Anderson
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA; Vanderbilt University, Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
| | - Bennett A Landman
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA; Vanderbilt University, Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA; Computer Science, Vanderbilt University, Nashville, TN, USA; Electrical Engineering, Vanderbilt University, Nashville, TN, USA
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14
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Nicotinamide Administration Improves Remyelination after Stroke. Neural Plast 2017; 2017:7019803. [PMID: 28656112 PMCID: PMC5471593 DOI: 10.1155/2017/7019803] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/16/2017] [Accepted: 03/13/2017] [Indexed: 01/07/2023] Open
Abstract
AIMS Stroke is a leading cause of morbidity and mortality. This study aimed to determine whether nicotinamide administration could improve remyelination after stroke and reveal the underlying mechanism. METHODS Adult male C57BL/6J mice were intraperitoneally (i.p.) administered with nicotinamide (200 mg/kg, daily) or saline after stroke induced by photothrombotic occlusion of the middle cerebral artery. FK866 (3 mg/kg, daily, bis in die), an inhibitor of NAMPT, and ANA-12 (0.5 mg/kg, daily), an antagonist of tropomyosin-related kinase B (TrkB), were administered intraperitoneally 1 h before nicotinamide administration. Functional recovery, MRI, and histological assessment were performed after stroke at different time points. RESULTS The nicotinamide-treated mice showed significantly lower infarct area 7 d after stroke induction and significantly higher fractional anisotropy (FA) in the ipsilesional internal capsule (IC) 14 d after stroke induction than the other groups. Higher levels of NAD+, BDNF, and remyelination markers were observed in the nicotinamide-treated group. FK866 administration reduced NAD+ and BDNF levels in the nicotinamide-treated group. ANA-12 administration impaired the recovery from stroke with no effect on NAD+ and BDNF levels. Furthermore, lesser functional deficits were observed in the nicotinamide-treated group than in the control group. CONCLUSIONS Nicotinamide administration improves remyelination after stroke via the NAD+/BDNF/TrkB pathway.
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15
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Rehni AK, Liu A, Perez-Pinzon MA, Dave KR. Diabetic aggravation of stroke and animal models. Exp Neurol 2017; 292:63-79. [PMID: 28274862 PMCID: PMC5400679 DOI: 10.1016/j.expneurol.2017.03.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 02/03/2017] [Accepted: 03/03/2017] [Indexed: 12/16/2022]
Abstract
Cerebral ischemia in diabetics results in severe brain damage. Different animal models of cerebral ischemia have been used to study the aggravation of ischemic brain damage in the diabetic condition. Since different disease conditions such as diabetes differently affect outcome following cerebral ischemia, the Stroke Therapy Academic Industry Roundtable (STAIR) guidelines recommends use of diseased animals for evaluating neuroprotective therapies targeted to reduce cerebral ischemic damage. The goal of this review is to discuss the technicalities and pros/cons of various animal models of cerebral ischemia currently being employed to study diabetes-related ischemic brain damage. The rational use of such animal systems in studying the disease condition may better help evaluate novel therapeutic approaches for diabetes related exacerbation of ischemic brain damage.
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Affiliation(s)
- Ashish K Rehni
- Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Allen Liu
- Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Miguel A Perez-Pinzon
- Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Kunjan R Dave
- Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
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16
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Li L, Chopp M, Ding G, Qu C, Nejad-Davarani SP, Davoodi-Bojd E, Li Q, Mahmood A, Jiang Q. Diffusion-Derived Magnetic Resonance Imaging Measures of Longitudinal Microstructural Remodeling Induced by Marrow Stromal Cell Therapy after Traumatic Brain Injury. J Neurotrauma 2016; 34:182-191. [PMID: 26993214 DOI: 10.1089/neu.2015.4315] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Using magnetic resonance imaging (MRI) and an animal model of traumatic brain injury (TBI), we investigated the capacity and sensitivity of diffusion-derived measures, fractional anisotropy (FA), and diffusion entropy, to longitudinally identify structural plasticity in the injured brain in response to the transplantation of human bone marrow stromal cells (hMSCs). Male Wistar rats (300-350g, n = 30) were subjected to controlled cortical impact TBI. At 6 h or 1 week post-injury, these rats were intravenously injected with 1 mL of saline (at 6 h or 1 week, n = 5/group) or with hMSCs in suspension (∼3 × 106 hMSCs, at 6 h or 1 week, n = 10/group). In vivo MRI measurements and sensorimotor function estimates were performed on all animals pre-injury, 1 day post-injury, and weekly for 3 weeks post-injury. Bielschowsky's silver and Luxol fast blue staining were used to reveal the axon and myelin status, respectively, with and without cell treatment after TBI. Based on image data and histological observation, regions of interest encompassing the structural alterations were made and the values of FA and entropy were monitored in these specific brain regions. Our data demonstrate that administration of hMSCs after TBI leads to enhanced white matter reorganization particularly along the boundary of contusional lesion, which can be identified by both FA and entropy. Compared with the therapy performed at 1 week post-TBI, cell intervention executed at 6 h expedites the brain remodeling process and results in an earlier functional recovery. Although FA and entropy present a similar capacity to dynamically detect the microstructural changes in the tissue regions with predominant orientation of fiber tracts, entropy exhibits a sensitivity superior to that of FA, in probing the structural alterations in the tissue areas with complex fiber patterns.
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Affiliation(s)
- Lian Li
- 1 Department of Neurology, Henry Ford Hospital , Detroit, Michigan
| | - Michael Chopp
- 1 Department of Neurology, Henry Ford Hospital , Detroit, Michigan.,2 Department of Physics, Oakland University , Rochester, Michigan
| | - Guangliang Ding
- 1 Department of Neurology, Henry Ford Hospital , Detroit, Michigan
| | - Changsheng Qu
- 3 Department of Neurosurgery, Henry Ford Hospital , Detroit, Michigan
| | | | | | - Qingjiang Li
- 1 Department of Neurology, Henry Ford Hospital , Detroit, Michigan
| | - Asim Mahmood
- 3 Department of Neurosurgery, Henry Ford Hospital , Detroit, Michigan
| | - Quan Jiang
- 1 Department of Neurology, Henry Ford Hospital , Detroit, Michigan.,2 Department of Physics, Oakland University , Rochester, Michigan
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17
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Ding G, Chen J, Chopp M, Li L, Yan T, Li Q, Cui C, Davarani SPN, Jiang Q. Cell Treatment for Stroke in Type Two Diabetic Rats Improves Vascular Permeability Measured by MRI. PLoS One 2016; 11:e0149147. [PMID: 26900843 PMCID: PMC4762715 DOI: 10.1371/journal.pone.0149147] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 01/27/2016] [Indexed: 01/02/2023] Open
Abstract
Treatment of stroke with bone marrow stromal cells (BMSC) significantly enhances brain remodeling and improves neurological function in non-diabetic stroke rats. Diabetes is a major risk factor for stroke and induces neurovascular changes which may impact stroke therapy. Thus, it is necessary to test our hypothesis that the treatment of stroke with BMSC has therapeutic efficacy in the most common form of diabetes, type 2 diabetes mellitus (T2DM). T2DM was induced in adult male Wistar rats by administration of a high fat diet in combination with a single intraperitoneal injection (35mg/kg) of streptozotocin. These rats were then subjected to 2h of middle cerebral artery occlusion (MCAo). T2DM rats received BMSC (5x106, n = 8) or an equal volume of phosphate-buffered saline (PBS) (n = 8) via tail-vein injection at 3 days after MCAo. MRI was performed one day and then weekly for 5 weeks post MCAo for all rats. Compared with vehicle treated control T2DM rats, BMSC treatment of stroke in T2DM rats significantly (p<0.05) decreased blood-brain barrier disruption starting at 1 week post stroke measured using contrast enhanced T1-weighted imaging with gadopentetate, and reduced cerebral hemorrhagic spots starting at 3 weeks post stroke measured using susceptibility weighted imaging, although BMSC treatment did not reduce the ischemic lesion volumes as demarcated by T2 maps. These MRI measurements were consistent with histological data. Thus, BMSC treatment of stroke in T2DM rats initiated at 3 days after stroke significantly reduced ischemic vascular damage, although BMSC treatment did not change infarction volume in T2DM rats, measured by MRI.
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Affiliation(s)
- Guangliang Ding
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
| | - Jieli Chen
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
| | - Michael Chopp
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
- Department of Physics, Oakland University, Rochester, Michigan, 48309, United States of America
| | - Lian Li
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
| | - Tao Yan
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin, 300052, China
| | - Qingjiang Li
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
| | - Chengcheng Cui
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
| | - Siamak P. N. Davarani
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
| | - Quan Jiang
- Department of Neurology, Henry Ford Hospital, 2799 West Grand Boulevard, Detroit, Michigan, 48202, United States of America
- * E-mail:
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