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Tao YS, Piao SG, Jin YS, Jin JZ, Zheng HL, Zhao HY, Lim SW, Yang CW, Li C. Expression of brain-derived neurotrophic factor in kidneys from normal and cyclosporine-treated rats. BMC Nephrol 2018. [PMID: 29540150 PMCID: PMC5853162 DOI: 10.1186/s12882-018-0852-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Accumulating evidence suggests that a decrease in brain-derived neurotrophic factor (BDNF) level induces a variety of psychiatric and neurological disorders. However, the expression and role of BDNF in the kidney have not been explored. The present study examined the expression of BDNF and tropomyosin-related kinase (Trk) receptors in an experimental model of chronic cyclosporine A (CsA) nephropathy. METHODS Sprague-Dawley rats on a salt-deplete diet were treated daily for four weeks with vehicle or CsA. Urine profiles, apoptotic cell death, oxidative stress (8-hydroxy-2'-deoxyguanosine, 8-OHdG), and expression of BDNF and Trk receptors (TrkB and TrkC) were compared between groups. The impact of vasopressin infusion on the urine-concentrating ability was examined by measuring the expression of aquaporin-2 (AQP-2) and BDNF and urine profiles in normal and CsA-treated rats. RESULTS Compared with the vehicle-treated rats, rats given CsA had enhanced urine volume and declined urine osmolality. Immunohistochemistry and immunoblotting showed that BDNF and Trk receptors were constitutively expressed in kidneys from vehicle-treated rats. This was confirmed by double immunofluorescent staining for Na-K-ATPase-α1, AQP-1, and AQP-2. By contrast, the expression of these factors decreased in kidneys from CsA-treated rats (BDNF: 51.1 ± 19.5% vs. 102.0 ± 30.3%, p < 0.01). Downregulation of BDNF was accompanied by impairment of urine osmolality, and this was reversed by exogenous infusion of vasopressin. Notably, the number of TUNEL-positive cells correlated negatively with BDNF expression and positively with urinary 8-OHdG excretion. CONCLUSIONS BDNF is expressed in the collecting duct of the kidney and may be associated with urine-concentrating ability in an experimental model of chronic CsA-induced nephropathy. Our study provides a new avenue for further investigation of chronic CsA nephropathy.
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Affiliation(s)
- Yuan Sheng Tao
- Department of Nephrology, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China
| | - Shang Guo Piao
- Department of Nephrology, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China
| | - Ying Shun Jin
- Department of Nephrology, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China
| | - Ji Zhe Jin
- Department of Nephrology, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China
| | - Hai Lan Zheng
- Department of Nephrology, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China
| | - Hai Yan Zhao
- Health Examination Center, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China
| | - Sun Woo Lim
- Transplant Research Center, Convergent Research Consortium for Immunologic Disease, The Catholic University of Korea, Seoul, South Korea
| | - Chul Woo Yang
- Transplant Research Center, Convergent Research Consortium for Immunologic Disease, The Catholic University of Korea, Seoul, South Korea.,Division of Nephrology, Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, South Korea
| | - Can Li
- Department of Nephrology, Yanbian University Hospital, #1327 Juzi St., Yanji, 133000, Jilin Province, People's Republic of China.
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2
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Matsuda KM, Lopes-Calcas A, Honke ML, O'Brien-Moran Z, Buist R, West M, Martin M. Ex vivo tissue imaging for radiology-pathology correlation: a pilot study with a small bore 7-T MRI in a rare pigmented ganglioglioma exhibiting complex MR signal characteristics associated with melanin and hemosiderin. J Med Imaging (Bellingham) 2017; 4:036001. [PMID: 28924575 PMCID: PMC5596201 DOI: 10.1117/1.jmi.4.3.036001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 08/09/2017] [Indexed: 12/02/2022] Open
Abstract
To advance magnetic resonance imaging (MRI) technologies further for in vivo tissue characterization with histopathologic validation, we investigated the feasibility of ex vivo tissue imaging of a surgically removed human brain tumor as a comprehensive approach for radiology–pathology correlation in histoanatomically identical fashion in a rare case of pigmented ganglioglioma with complex paramagnetic properties. Pieces of surgically removed ganglioglioma, containing melanin and hemosiderin pigments, were imaged with a small bore 7-T MRI scanner to obtain T1-, T2-, and T2*-weighted image and diffusion tensor imaging (DTI). Corresponding histopathological slides were prepared for routine hematoxylin and eosin stain and special stains for melanin and iron/hemosiderin to correlate with MRI signal characteristics. Furthermore, mean diffusivity (MD) maps were generated from DTI data and correlated with cellularity using image analysis. While the presence of melanin was difficult to interpret in in vivo MRI with certainty due to concomitant hemosiderin pigments and calcium depositions, ex vivo tissue imaging clearly demonstrated pieces of tissue exhibiting the characteristic MR signal pattern for melanin with pathologic confirmation in a histoanatomically identical location. There was also concordant correlation between MD and cellularity. Although it is still in an initial phase of development, ex vivo tissue imaging is a promising approach, which offers radiology–pathology correlation in a straightforward and comprehensive manner.
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Affiliation(s)
- Kant M Matsuda
- University of Manitoba, Max Rady College of Medicine, Department of Pathology, Rady Faculty of Health Sciences, Winnipeg, Manitoba, Canada.,Health Sciences Centre Winnipeg, Department of Pathology, Diagnostic Services of Manitoba, Winnipeg, Manitoba, Canada.,Memorial Sloan-Kettering Cancer Center, Department of Pathology, New York, New York, United States
| | - Ana Lopes-Calcas
- University of Manitoba, Max Rady College of Medicine, Department of Pathology, Rady Faculty of Health Sciences, Winnipeg, Manitoba, Canada
| | - Michael L Honke
- University of Winnipeg, Department of Physics, Winnipeg, Manitoba, Canada
| | - Zoe O'Brien-Moran
- University of Winnipeg, Department of Physics, Winnipeg, Manitoba, Canada
| | - Richard Buist
- University of Manitoba, Max Rady College of Medicine, Department of Radiology, Rady Faculty of Health Sciences, Winnipeg, Manitoba, Canada
| | - Michael West
- University of Manitoba, Max Rady College of Medicine, Department of Neurosurgery, Rady Faculty of Health Sciences, Winnipeg, Manitoba, Canada
| | - Melanie Martin
- University of Winnipeg, Department of Physics, Winnipeg, Manitoba, Canada.,University of Manitoba, Max Rady College of Medicine, Department of Radiology, Rady Faculty of Health Sciences, Winnipeg, Manitoba, Canada
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3
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Kuhla A, Rühlmann C, Lindner T, Polei S, Hadlich S, Krause BJ, Vollmar B, Teipel SJ. APPswe/PS1dE9 mice with cortical amyloid pathology show a reduced NAA/Cr ratio without apparent brain atrophy: A MRS and MRI study. NEUROIMAGE-CLINICAL 2017; 15:581-586. [PMID: 28652970 PMCID: PMC5476467 DOI: 10.1016/j.nicl.2017.06.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/07/2017] [Accepted: 06/08/2017] [Indexed: 12/26/2022]
Abstract
Transgenic animal models of Aβ pathology provide mechanistic insight into some aspects of Alzheimer disease (AD) pathology related to Aβ accumulation. Quantitative neuroimaging is a possible aid to improve translation of mechanistic findings in transgenic models to human end phenotypes of brain morphology or function. Therefore, we combined MRI-based morphometry, MRS-based NAA-assessment and quantitative histology of neurons and amyloid plaque load in the APPswe/PS1dE9 mouse model to determine the interrelationship between morphological changes, changes in neuron numbers and amyloid plaque load with reductions of NAA levels as marker of neuronal functional viability. The APPswe/PS1dE9 mouse showed an increase of Aβ plaques, loss of neurons and an impairment of NAA/Cr ratio, which however was not accompanied with brain atrophy. As brain atrophy is one main characteristic in human AD, conclusions from murine to human AD pathology should be drawn with caution.
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Affiliation(s)
- Angela Kuhla
- Institute for Experimental Surgery, Rostock University Medical Center, Rostock, Germany.
| | - Claire Rühlmann
- Institute for Experimental Surgery, Rostock University Medical Center, Rostock, Germany
| | - Tobias Lindner
- Core Facility Multimodal Small Animal Imaging, Rostock University Medical Center, Rostock, Germany
| | - Stefan Polei
- Core Facility Multimodal Small Animal Imaging, Rostock University Medical Center, Rostock, Germany
| | - Stefan Hadlich
- Institute of Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Greifswald, Germany
| | - Bernd J Krause
- Department of Nuclear Medicine, Rostock University Medical Center, Rostock, Germany
| | - Brigitte Vollmar
- Institute for Experimental Surgery, Rostock University Medical Center, Rostock, Germany
| | - Stefan J Teipel
- German Center for Neurodegenerative Diseases (DZNE) - Rostock/Greifswald, Rostock, Germany, Department of Psychosomatic Medicine, University of Rostock, Rostock, Germany
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4
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Morrone CD, Thomason LAM, Brown ME, Aubert I, McLaurin J. Effects of Neurotrophic Support and Amyloid-Targeted Combined Therapy on Adult Hippocampal Neurogenesis in a Transgenic Model of Alzheimer's Disease. PLoS One 2016; 11:e0165393. [PMID: 27768761 PMCID: PMC5074589 DOI: 10.1371/journal.pone.0165393] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 10/11/2016] [Indexed: 12/29/2022] Open
Abstract
Although it is recognized that multi-drug therapies may be necessary to combat AD, there is a paucity of preclinical proof of concept studies. We present a combination treatment paradigm, which temporally affects different aspects of Alzheimer's disease (AD)-like pathology, specifically Aβ-toxicity and neurogenesis. At early stages of AD-like pathology, in TgCRND8 mice, we found that combating Aβ pathology with scyllo-inositol ameliorated deficits in neurogenesis. Older TgCRND8 mice with established amyloid load had decreased progenitor cell proliferation and survival compared to non-transgenic mice, regardless of scyllo-inositol treatment. The prolonged exposure to Aβ-pathology leads to deficits in the neurogenic niche, thus targeting Aβ alone is insufficient to rescue neurogenesis. To support the neurogenic niche, we combined scyllo-inositol treatment with leteprinim potassium (neotrofin), the latter of which stimulates neurotrophin expression. We show that the combination treatment of scyllo-inositol and neotrofin enhances neuronal survival and differentiation. We propose this proof of concept combination therapy of targeting Aβ-pathology and neurotrophin deficits as a potential treatment for AD.
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Affiliation(s)
- Christopher D Morrone
- Biological Sciences, Sunnybrook Research Institute, M4N 3M5, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, M5S 1A8, Toronto, ON, Canada
| | - Lynsie A M Thomason
- Physical Sciences, Sunnybrook Research Institute, M4N 3M5, Toronto, ON, Canada
| | - Mary E Brown
- Biological Sciences, Sunnybrook Research Institute, M4N 3M5, Toronto, ON, Canada
| | - Isabelle Aubert
- Biological Sciences, Sunnybrook Research Institute, M4N 3M5, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, M5S 1A8, Toronto, ON, Canada
| | - JoAnne McLaurin
- Biological Sciences, Sunnybrook Research Institute, M4N 3M5, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, M5S 1A8, Toronto, ON, Canada
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5
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Badea A, Kane L, Anderson RJ, Qi Y, Foster M, Cofer GP, Medvitz N, Buckley AF, Badea AK, Wetsel WC, Colton CA. The fornix provides multiple biomarkers to characterize circuit disruption in a mouse model of Alzheimer's disease. Neuroimage 2016; 142:498-511. [PMID: 27521741 DOI: 10.1016/j.neuroimage.2016.08.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 06/23/2016] [Accepted: 08/09/2016] [Indexed: 12/19/2022] Open
Abstract
Multivariate biomarkers are needed for detecting Alzheimer's disease (AD), understanding its etiology, and quantifying the effect of therapies. Mouse models provide opportunities to study characteristics of AD in well-controlled environments that can help facilitate development of early interventions. The CVN-AD mouse model replicates multiple AD hallmark pathologies, and we identified multivariate biomarkers characterizing a brain circuit disruption predictive of cognitive decline. In vivo and ex vivo magnetic resonance imaging (MRI) revealed that CVN-AD mice replicate the hippocampal atrophy (6%), characteristic of humans with AD, and also present changes in subcortical areas. The largest effect was in the fornix (23% smaller), which connects the septum, hippocampus, and hypothalamus. In characterizing the fornix with diffusion tensor imaging, fractional anisotropy was most sensitive (20% reduction), followed by radial (15%) and axial diffusivity (2%), in detecting pathological changes. These findings were strengthened by optical microscopy and ultrastructural analyses. Ultrastructual analysis provided estimates of axonal density, diameters, and myelination-through the g-ratio, defined as the ratio between the axonal diameter, and the diameter of the axon plus the myelin sheath. The fornix had reduced axonal density (47% fewer), axonal degeneration (13% larger axons), and abnormal myelination (1.5% smaller g-ratios). CD68 staining showed that white matter pathology could be secondary to neuronal degeneration, or due to direct microglial attack. In conclusion, these findings strengthen the hypothesis that the fornix plays a role in AD, and can be used as a disease biomarker and as a target for therapy.
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Affiliation(s)
- Alexandra Badea
- Center for In Vivo Microscopy, Duke University Medical Center, Department of Radiology, Durham, NC 27710, USA.
| | - Lauren Kane
- Trinity College of Arts & Sciences, Duke University, Durham, NC 27710, USA
| | - Robert J Anderson
- Center for In Vivo Microscopy, Duke University Medical Center, Department of Radiology, Durham, NC 27710, USA
| | - Yi Qi
- Center for In Vivo Microscopy, Duke University Medical Center, Department of Radiology, Durham, NC 27710, USA
| | - Mark Foster
- Center for In Vivo Microscopy, Duke University Medical Center, Department of Radiology, Durham, NC 27710, USA
| | - Gary P Cofer
- Center for In Vivo Microscopy, Duke University Medical Center, Department of Radiology, Durham, NC 27710, USA
| | - Neil Medvitz
- Department of Pathology, and Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, NC 27710, USA
| | - Anne F Buckley
- Department of Pathology, and Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, NC 27710, USA
| | - Andreas K Badea
- Center for In Vivo Microscopy, Duke University Medical Center, Department of Radiology, Durham, NC 27710, USA
| | - William C Wetsel
- Departments of Psychiatry and Behavioral Sciences, Cell Biology, and Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Carol A Colton
- Department of Neurology, Duke University Medical Center, Durham, NC 27710, USA
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