101
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Bhatia P, Kaur G, Singh N. Ozagrel a thromboxane A2 synthase inhibitor extenuates endothelial dysfunction, oxidative stress and neuroinflammation in rat model of bilateral common carotid artery occlusion induced vascular dementia. Vascul Pharmacol 2021; 137:106827. [PMID: 33346090 DOI: 10.1016/j.vph.2020.106827] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 08/14/2020] [Accepted: 12/15/2020] [Indexed: 12/16/2022]
Abstract
The present study investigates the potential of ozagrel, a thromboxane A2 (TXA2) synthase inhibitor, in bilateral common carotid artery occlusion (BCCAo) induced vascular dementia (VaD). Wistar rats were subjected to BCCAo procedure under anesthesia to induce VaD. Morris water maze (MWM) test was employed on 7th day post-surgery to determine learning and memory. Endothelial dysfunction was assessed in isolated aorta by observing endothelial dependent vasorelaxation and levels of serum nitrite. A battery of biochemical and histopathological estimations was performed. Expression analysis of inflammatory cytokines TNF-α and IL-6 was carried out by RT-PCR. BCCAo produced significant impairment in endothelium dependent vasorelaxation and decrease in serum nitrite levels indicating endothelial dysfunction along with poor performance on MWM represents impairment of learning and memory. There was a significant rise in brain oxidative stress level (indicated by increase in brain thiobarbituric acid reactive species and decrease in reduced glutathione levels); increase in brain acetylcholinesterase activity; brain myeloperoxidase activity; brain TNF-α & IL-6 levels, brain TNF-α & IL-6 mRNA expression and brain neutrophil infiltration (as marker of inflammation) were also observed. Treatment of ozagrel (10 & 20 mg/kg, p. o.)/donepezil (0. 5 mg/kg, i.p., serving as standard) ameliorated BCCAo induced endothelial dysfunction; memory deficits; biochemical and histopathological changes in a significant manner. It may be concluded that ozagrel markedly improved endothelial dysfunction; learning and memory; biochemical and histopathological alteration associated with BCCAo induced VaD and that TXA2 can be considered as an important therapeutic target for the treatment of VaD.
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MESH Headings
- Animals
- Behavior, Animal/drug effects
- Brain/drug effects
- Brain/enzymology
- Brain/physiopathology
- Carotid Artery, Common/surgery
- Carotid Stenosis/complications
- Dementia, Vascular/drug therapy
- Dementia, Vascular/enzymology
- Dementia, Vascular/etiology
- Dementia, Vascular/physiopathology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/enzymology
- Endothelium, Vascular/physiopathology
- Enzyme Inhibitors/pharmacology
- Female
- Inflammation Mediators/metabolism
- Ligation
- Male
- Methacrylates/pharmacology
- Morris Water Maze Test/drug effects
- Oxidative Stress/drug effects
- Rats, Wistar
- Thromboxane-A Synthase/antagonists & inhibitors
- Thromboxane-A Synthase/metabolism
- Rats
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Affiliation(s)
- Pankaj Bhatia
- CNS Research lab., Pharmacology division, Department of Pharmaceutical Sciences and Drug Research, Faculty of Medicine, Punjabi University, Patiala 147002, Punjab, India
| | - Gagandeep Kaur
- CNS Research lab., Pharmacology division, Department of Pharmaceutical Sciences and Drug Research, Faculty of Medicine, Punjabi University, Patiala 147002, Punjab, India
| | - Nirmal Singh
- Pharmacology division, Department of Pharmaceutical Sciences and Drug Research, Faculty of Medicine, Punjabi University, Patiala 147002, Punjab, India.
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102
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Does breaking up prolonged sitting improve cognitive functions in sedentary adults? A mapping review and hypothesis formulation on the potential physiological mechanisms. BMC Musculoskelet Disord 2021; 22:274. [PMID: 33711976 PMCID: PMC7955618 DOI: 10.1186/s12891-021-04136-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 03/02/2021] [Indexed: 12/13/2022] Open
Abstract
Background Prolonged (excessive) sitting is detrimentally associated with cardiovascular, metabolic and mental health. Moreover, prolonged sitting has been associated with poor executive function, memory, attention and visuospatial skills, which are important cognitive aspects of work performance. Breaking up prolonged sitting with standing or light-intensity exercises at the workplace is recognized as a potential measure in improving cognition. However, preliminary evidence, primarily from acute laboratory experiments, has enabled formulating hypothesis on the possible mechanistic pathways. Hence, the aim of this mapping review is to gather preliminary evidence and substantiate possible physiological mechanisms underpinning the putative effects of breaking prolonged sitting on improving cognitive function among sedentary office workers. Mapping method We searched four databases to identify relevant studies that explored the effects of uninterrupted sitting on cognitive function. First, we introduce how prolonged sitting increases the risks of hyperglycemia, autonomic stability, inflammation, adverse hormonal changes and restrictions in cerebral blood flow (CBF) and alters cognitive function. Second, we elucidate the direct and indirect effects of breaking up prolonged sitting time that may prevent a decline in cognitive performance by influencing glycaemic variability, autonomic stability, hormones (brain derived neurotrophic factor, dopamine, serotonin), vascular functions, and CBF. We highlight the importance of breaking up prolonged sitting on metabolic, vascular and endocrine functions, which in turn may improve cognitive functions and eventually foster work productivity. Improved synaptic transmission or neuroplasticity due to increased brain glucose and mitochondrial metabolism, increased endothelial shear and CBF, increased brain neurotrophic factors (dopamine) and accelerated anti-inflammatory functions are some of the hypothetical mechanisms underpinning improved cognitive functions. Conclusion We postulate that improving cognitive function by breaking up prolonged sitting periods is biologically plausible with the myriad of (suggested) physiological mechanisms. Future experimental studies to ascertain the aforementioned hypothetical mechanisms and clinical trials to break sedentary behavior and improve cognitive functions in sedentary office workers are warranted. Supplementary Information The online version contains supplementary material available at 10.1186/s12891-021-04136-5.
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103
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Kim MS, Bang J, Kim BY, Jeon WK. Impaired Cognitive Flexibility Induced by Chronic Cerebral Hypoperfusion in the 5XFAD Transgenic Mouse Model of Mixed Dementia. J Gerontol A Biol Sci Med Sci 2021; 76:1169-1178. [PMID: 33709149 PMCID: PMC8202140 DOI: 10.1093/gerona/glab075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Indexed: 12/27/2022] Open
Abstract
Cerebrovascular lesions are widely prevalent in patients with Alzheimer’s disease (AD), but their relationship to the pathophysiology of AD remains poorly understood. An improved understanding of the interaction of cerebrovascular damage with AD is crucial for the development of therapeutic approaches. Herein, we investigated the effects of chronic cerebral hypoperfusion (CCH) in a 5XFAD transgenic (Tg) mouse model of AD. We established CCH conditions in both Tg and non-Tg mice by inducing unilateral common carotid artery occlusion (UCCAO). Cognitive performance in mice was evaluated, and their brain tissue was examined for amyloid-beta (Aβ) pathology to elucidate possible mechanisms. We found that UCCAO-operated Tg mice showed impaired cognitive flexibility in the reversal phase of the hidden-platform water maze task compared to sham-operated Tg mice. Interestingly, UCCAO-operated Tg mice used fewer spatial cognitive strategies than sham-operated Tg mice during reversal learning. These cognitive deficits were accompanied by increased Aβ plaque burden and Aβ42 levels in the hippocampus and prefrontal cortex, 2 regions that play essential roles in the regulation of cognitive flexibility. Furthermore, changes in cognitive flexibility are strongly correlated with the expression levels of enzymes related to Aβ clearance, such as neprilysin and insulin-degrading enzymes. These findings suggest that, in 5XFAD mice, impaired cognitive flexibility is related to CCH, and that Aβ clearance might be involved in this process.
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Affiliation(s)
- Min-Soo Kim
- Herbal Medicine Research Division, Korea Institute of Oriental Medicine, Daejeon, South Korea.,Convergence Research Center for Diagnosis, Treatment and Care System of Dementia, Korea Institute of Science and Technology, Seoul, South Korea
| | - Jihye Bang
- Herbal Medicine Research Division, Korea Institute of Oriental Medicine, Daejeon, South Korea.,Convergence Research Center for Diagnosis, Treatment and Care System of Dementia, Korea Institute of Science and Technology, Seoul, South Korea
| | - Bu-Yeo Kim
- Herbal Medicine Research Division, Korea Institute of Oriental Medicine, Daejeon, South Korea
| | - Won Kyung Jeon
- Herbal Medicine Research Division, Korea Institute of Oriental Medicine, Daejeon, South Korea.,Convergence Research Center for Diagnosis, Treatment and Care System of Dementia, Korea Institute of Science and Technology, Seoul, South Korea
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104
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Andika FR, Yoon JH, Kim GS, Jeong Y. Intermittent Fasting Alleviates Cognitive Impairments and Hippocampal Neuronal Loss but Enhances Astrocytosis in Mice with Subcortical Vascular Dementia. J Nutr 2021; 151:722-730. [PMID: 33484139 DOI: 10.1093/jn/nxaa384] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 09/22/2020] [Accepted: 11/10/2020] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Intermittent fasting (IF) is found to exhibit neuroprotection against various insults, including ischemia; however, IF has been mainly applied before disease onset. It remains unknown whether IF implementation alleviates the long-term detrimental effects of a disease after its establishment. OBJECTIVES To investigate the IF effects on cognitive impairments and cerebrovascular pathologies in a subcortical vascular dementia (SVaD) mouse model. METHODS The SVaD model was developed by inducing hypoperfusion and hyperlipidemia in apoE-deficient (apoE-/-) mice. We subjected 10-week-old apoE-/- mice to bilateral common carotid artery stenosis using micro-coils after they were fed a high-fat diet (HFD; 45% energy) for 6 weeks to induce hyperlipidemia. Age-matched wild-type C57BL/6J mice received sham surgery after undergoing an identical HFD treatment. Both the SVaD model and wild-type mice either started a 1-month IF regimen (time-restricted feeding for 6 hours per day) or continued the standard diet ad libitum (6.2% fat energy) at 8 weeks post-surgery. We assessed mice weight, food intake, and outcomes in a behavioral test battery before, during, and after the IF regimen, prior to histopathological analyses (microvessel density, neuronal density, white matter damage, astrocytosis) of their brains. RESULTS SVaD model mice on the IF regimen (SVaD-IF) exhibited higher mean recognition and spatial working memory performance compared to SVaD mice fed ad libitum (SVaD-AL; P < 0.01). Additionally, SVaD-IF mice had ∼5% higher hippocampal neuronal density in the dentate gyrus (DG) and cornu ammonis 1 regions than SVaD-AL mice (P < 0.001), which paralleled their post-IF cognitive enhancements. However, SVaD-IF mice showed an ∼50% increase in hippocampal DG astrocytosis compared to SVaD-AL mice (P < 0.05), with no significant differences in microvessel densities among the 2 groups. CONCLUSIONS The improvements in SVaD-IF mice suggest that IF could be a potential nonpharmacological remedy for SVaD. This finding could stimulate future investigations on IF's neuroprotective potential across many neurovascular diseases.
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Affiliation(s)
- Faris Rizky Andika
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.,KAIST Institute for Health Science and Technology, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Jin-Hui Yoon
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.,KAIST Institute for Health Science and Technology, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Gaon Sandy Kim
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.,KAIST Institute for Health Science and Technology, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Yong Jeong
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.,KAIST Institute for Health Science and Technology, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
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105
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Lin H, Jin T, Chen L, Dai Y, Jia W, He X, Yang M, Li J, Liang S, Wu J, Huang J, Chen L, Liu W, Tao J. Longitudinal tracing of neurochemical metabolic disorders in working memory neural circuit and optogenetics modulation in rats with vascular cognitive impairment. Brain Res Bull 2021; 170:174-186. [PMID: 33600886 DOI: 10.1016/j.brainresbull.2021.02.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/02/2021] [Accepted: 02/09/2021] [Indexed: 11/30/2022]
Abstract
Chronic cerebral ischemia leads to vascular cognitive impairment (VCI) that exacerbates along with ischemia time and eventually develops into dementia. Recent advances in molecular neuroimaging contribute to understand its pathological characteristics. We previously traced the anisotropic diffusion of water molecules suggests that chronic cerebral ischemia leads to irreversible progressive damage to white matter integrity. However, the abnormalities of gray matter activity following chronic cerebral ischemia remains not entirely understood. In this study, in vivo hydrogen proton magnetic resonance spectroscopy (1H-MRS) was applied to longitudinally track the neurochemical metabolic disorder of gray matter associated with working memory, and optogenetics modulation of neurochemical metabolism was performed for targeted treatment of VCI. The results showed that the concentration of N-acetylaspartate (NAA) in the right hippocampus, left hippocampus, right medial prefrontal cortex (mPFC) and mediodorsal thalamus was decreased as early as 7 days after chronic cerebral ischemia, subsequently gamma-aminobutyric acid (GABA) declined whereas myo-inositol (mI) and glutamate (Glu) increased at 14 days, as well as choline (Cho) lost at 28 days, concurrently the change of Glu and GABA in the mPFC and hippocampus was ischemia time-dependent manner within 1 month. Behaviorally, working memory and object recognition memory were impaired at 14 days, 28 days that significantly correlated with neurochemical metabolic disorders. Interestingly, using optogenetics modulation of PV neurons in the mPFC, the metabolic abnormalities of NAA and GABA in working memory neural circuit could be repaired after chronic cerebral ischemia, together with behavior improvements. These findings suggested that as early as 1∼4 weeks after chronic cerebral ischemia, the metabolism of NAA, Glu, mI and Cho was synchronously impaired in neural circuit of hippocampus-mediodorsal thalamus-mPFC, and the loss of GABA delayed in the hippocampus, and optogenetics modulation of parvalbumin (PV) neurons in the mPFC can improve the neurochemical metabolism of working memory neural circuit and enhance working memory.
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Affiliation(s)
- Huawei Lin
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Tingting Jin
- National-Local Joint Engineering Research Center of Rehabilitation Medicine Technology & Traditional Chinese Medicine Rehabilitation Research Center of State Administration of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Lewen Chen
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Yaling Dai
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Weiwei Jia
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Xiaojun He
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Minguang Yang
- National-Local Joint Engineering Research Center of Rehabilitation Medicine Technology & Traditional Chinese Medicine Rehabilitation Research Center of State Administration of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Jianhong Li
- National-Local Joint Engineering Research Center of Rehabilitation Medicine Technology & Traditional Chinese Medicine Rehabilitation Research Center of State Administration of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Shengxiang Liang
- Rehabilitation Industry Institute, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Jinsong Wu
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Jia Huang
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Lidian Chen
- National-Local Joint Engineering Research Center of Rehabilitation Medicine Technology & Traditional Chinese Medicine Rehabilitation Research Center of State Administration of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China
| | - Weilin Liu
- Rehabilitation Industry Institute, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China.
| | - Jing Tao
- National-Local Joint Engineering Research Center of Rehabilitation Medicine Technology & Traditional Chinese Medicine Rehabilitation Research Center of State Administration of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China; Rehabilitation Industry Institute, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, 350122, PR China.
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106
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Selective accumulation of adiponectin in the cerebral cortex under chronic cerebral hypoperfusion in the rat. Neuroreport 2021; 31:148-155. [PMID: 31855901 DOI: 10.1097/wnr.0000000000001391] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Adiponectin is a plasma protein predominantly derived from adipocytes. Adiponectin has beneficial properties against diabetes, cardiovascular diseases, and cancer. In experimental acute cerebral ischemia, adiponectin accumulates on vessels in ischemic lesions and has anti-inflammatory protective effects. Chronic cerebral hypoperfusion is associated with white matter lesions and risk of dementia. Chronic cerebral hypoperfusion induced by permanent occlusion of the bilateral common carotid artery can experimentally produce cerebrovascular white matter lesions in the rat brain. Microglia are activated shortly after ischemia and correlate with the severity of white matter and hippocampal tissue damage. These data suggest that the inflammatory response selectively increases white matter and hippocampal damage during chronic cerebral hypoperfusion. However, factors protecting the cerebral cortex have not been elucidated. To clarify the role of adiponectin, we investigated possible changes in adiponectin and adiponectin receptor 1 (ADR1) in the brains of rats under chronic cerebral hypoperfusion. Adiponectin accumulated on the vessels predominantly in the cerebral cortex under chronic cerebral hypoperfusion. Adiponectin accumulation was not detected in the white matter or hippocampus. In the cerebral cortex, the number of ADR1-immunopositive vessels was increased, and adiponectin was colocalized with ADR1. It is plausible that accumulation of adiponectin may be mediated by the binding of adiponectin to ADR1, and its accumulation in the cerebral cortex may protect tissue injury by inhibiting inflammation under chronic cerebral hypoperfusion.
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107
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Mokhtari Sangdehi SR, Hajizadeh Moghaddam A, Ranjbar M. Anti-apoptotic effect of silymarin-loaded chitosan nanoparticles on hippocampal caspase-3 and Bcl-2 expression following cerebral ischemia/reperfusion injury. Int J Neurosci 2021; 132:1102-1109. [PMID: 33287594 DOI: 10.1080/00207454.2020.1860971] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND Cerebral ischemia/reperfusion (I/R) causes memory and learning impairments and apoptosis in the hippocampus. The aim of present study aimed to investigate the anti-apoptotic effects of silymarin-loaded chitosan nanoparticles (SM-CS-NPs) on the expression of Bcl-2 and Caspase-3 genes in hippocampal neurons after I/R injury. MATERIAL AND METHODS SM and SM-CS-NPs were orally administered (15 mg/kg) for 14 days, and then cerebral I/R injury was induced by the bilateral common carotid artery occlusion (BCCAO). One day after I/R induction, memory and learning impairments and various biochemical estimations were assessed. RESULTS Our results indicated that SM-CS-NPs improved I/R-induced memory and learning impairments and oxidative damage in the hippocampal region. The qRT-PCR analysis indicated that SM-CS-NPs pretreatment inhibited I/R-induced neuronal apoptosis by increasing the expression of Bcl-2 and decreasing the expression of Caspase-3 in the hippocampus. CONCLUSION These findings suggest that SM-CS-NPs exert neuroprotective effects, and the neuroprotection is likely to be associated with the regulation of Bcl-2 and Caspase-3, leading to inhibition of apoptotic cell death in hippocampal neurons.
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Affiliation(s)
| | | | - Mojtaba Ranjbar
- Faculty of Biotechnology, Amol University of Special Modern Technologies, Amol, Iran
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108
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de la Torre JC. Deciphering Alzheimer's Disease Pathogenic Pathway: Role of Chronic Brain Hypoperfusion on p-Tau and mTOR. J Alzheimers Dis 2021; 79:1381-1396. [PMID: 33459641 DOI: 10.3233/jad-201165] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review examines new biomolecular findings that lend support to the hemodynamic role played by chronic brain hypoperfusion (CBH) in driving a pathway to Alzheimer's disease (AD). CBH is a common clinical feature of AD and the current topic of intense investigation in AD models. CBH is also the basis for the vascular hypothesis of AD which we originally proposed in 1993. New biomolecular findings reveal the interplay of CBH in increasing tau phosphorylation (p-Tau) in the hippocampus and cortex of AD mice, damaging fast axonal transport, increasing signaling of mammalian target of rapamycin (mTOR), impairing learning-memory function, and promoting the formation of neurofibrillary tangles, a neuropathologic hallmark of AD. These pathologic elements have been singularly linked with neurodegeneration and AD but their abnormal, collective participation during brain aging have not been fully examined. The format for this review will provide a consolidated analysis of each pathologic phase contributing to cognitive decline and AD onset, summarized in nine chronological steps. These steps galvanize each factor's active participation and contribution in constructing a biomolecular pathway to AD onset generated by CBH.
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Affiliation(s)
- Jack C de la Torre
- Department of Psychology, University of Texas at Austin, Austin, TX, USA.,Department of Physiology, University of Valencia Faculty of Medicine, Valencia, Spain
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109
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Dhaliwal N, Dhaliwal J, Singh A, Chopra K. Dimethyl fumarate attenuates 2-VO-induced vascular dementia via activating the Nrf2 signaling pathway in rats. Inflammopharmacology 2021; 29:537-547. [PMID: 33459879 DOI: 10.1007/s10787-020-00785-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 12/04/2020] [Indexed: 12/17/2022]
Abstract
BACKGROUND Chronic cerebral hypoperfusion (CCH) induced oxidative stress and inflammation is known to be implicated in the pathogenesis of vascular dementia. The nuclear factor erythroid 2-related factor 2 (Nrf2) has emerged as a potential therapeutic target for neuroprotection. In the present study, we investigated the beneficial effects of dimethyl fumarate (DMF), an Nrf2 activator in an experimental model of vascular dementia. METHODS Permanent occlusion of the bilateral common carotid arteries (2-VO) was performed to induce CCH in adult male Sprague-Dawley rats. DMF (15, 30, and 60 mg/kg) was administered for 4 weeks. Cognitive performance was assessed using the Morris water maze (MWM) and novel object (NOR) tests. After behavior tests, various oxidative and inflammatory markers were assessed in the hippocampus. RESULTS The obtained results indicate that treatment with DMF significantly improved 2 VO-induced cognitive deficits. DMF decreased MDA (p < 0.001), protein carbonyl (PCO) contents (p < 0.001), and acetylcholinesterase (p < 0.01) activities, and inhibited inflammatory markers (TNF-α, IL-1β, NF-κβ, and COX-2) levels. Furthermore, our results showed that DMF augmented GSH (p < 0.001) levels and SOD (p < 0.05), CAT, and GSH-Px (p < 0.001) activities in the hippocampus. Nrf2 (p < 0.05) and its downstream targets HO-1 levels (p < 0.01) and NQO1 (p < 0.05) levels were also up-regulated after DMF treatment. CONCLUSION Taken together, the results demonstrate that DMF could serve as a promising neuroprotective agent for treating vascular dementia.
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Affiliation(s)
- Navneet Dhaliwal
- Pharmacology Research Laboratory, Pharmacology Division, UGC Centre of Advanced Studies, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India
| | - Jatinder Dhaliwal
- Pharmacology Research Laboratory, Pharmacology Division, UGC Centre of Advanced Studies, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India
| | - Aagamjit Singh
- All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India
| | - Kanwaljit Chopra
- Pharmacology Research Laboratory, Pharmacology Division, UGC Centre of Advanced Studies, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India.
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110
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Zhang M, Hu Y, Zhang J, Zhang J. FTY720 Prevents Spatial Memory Impairment in a Rat Model of Chronic Cerebral Hypoperfusion via a SIRT3-Independent Pathway. Front Aging Neurosci 2021; 12:593364. [PMID: 33519419 PMCID: PMC7845736 DOI: 10.3389/fnagi.2020.593364] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 12/07/2020] [Indexed: 12/21/2022] Open
Abstract
Vascular dementia (VD) and Alzheimer's disease (AD) are the most prevalent types of late-life dementia. Chronic cerebral hypoperfusion (CCH) contributes to both AD and VD. Recently, accumulating evidence has indicated that fingolimod (FTY720) is neuroprotective in acute cerebral ischemic stroke animal models, and the drug is now being used in clinical translation studies. However, fewer studies have addressed the role of FTY720 in chronic cerebral hypoperfusion (CCH)-related brain damage. In the present study, to investigate whether FTY720 can improve CCH-induced spatial memory loss and its underlying mechanism, two-vessel occlusion (2VO) rats were administered intraperitoneal FTY720 (1 mg/kg) for 7 consecutive weeks from post-operative day 8. Spatial memory was tested using the Morris Water Maze (MWM), and the rats' brains were harvested to allow molecular, biochemical, and pathological tests. We found that FTY720 treatment significantly reduced the escape latency and increased the target quadrant swimming time of the 2VO rats in the MWM task. The improvement in memory performance paralleled lower levels of pro-inflammatory cytokines and Iba-1 positive cells in the hippocampus of the 2VO rats, indicating that FTY720 had a beneficial effect in mitigating neuroinflammation. Furthermore, we found that FTY720 alleviated mitochondrial dysfunction in 2VO rats, as manifested by lower malondialdehyde levels, higher ATP content, and upregulation of ATP synthase activity in the hippocampus after treatment. FTY720 had no effect on the CCH-induced decrease in the activity of hippocampal Sirtuin-3, a master regulator of mitochondrial function and neuroinflammation. In summary, the results showed that FTY720 can improve CCH-induced spatial memory loss. The mechanism may involve Sirtuin-3-independent regulation of mitochondrial dysfunction and neuroinflammation in the hippocampus. The present study provides new clues to the pathological mechanism of CCH-induced cognitive impairment.
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Affiliation(s)
- Miao Zhang
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Yuan Hu
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Jiahui Zhang
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Junjian Zhang
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, China
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111
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Li W, Wei D, Zhu Z, Xie X, Zhan S, Zhang R, Zhang G, Huang L. Dl-3-n-Butylphthalide Alleviates Hippocampal Neuron Damage in Chronic Cerebral Hypoperfusion via Regulation of the CNTF/CNTFRα/JAK2/STAT3 Signaling Pathways. Front Aging Neurosci 2021; 12:587403. [PMID: 33519417 PMCID: PMC7838126 DOI: 10.3389/fnagi.2020.587403] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 11/23/2020] [Indexed: 01/04/2023] Open
Abstract
Chronic cerebral hypoperfusion (CCH) contributes to cognitive impairments, and hippocampal neuronal death is one of the key factors involved in this process. Dl-3-n-butylphthalide (D3NB) is a synthetic compound originally isolated from the seeds of Apium graveolens, which exhibits neuroprotective effects against some neurological diseases. However, the protective mechanisms of D3NB in a CCH model mimicking vascular cognitive impairment remains to be explored. We induced CCH in rats by a bilateral common carotid artery occlusion (BCCAO) operation. Animals were randomly divided into a sham-operated group, CCH 4-week group, CCH 8-week group, and the corresponding D3NB-treatment groups. Cultured primary hippocampal neurons were exposed to oxygen-glucose deprivation/reperfusion (OGD/R) to mimic CCH in vitro. We aimed to explore the effects of D3NB treatment on hippocampal neuronal death after CCH as well as its underlying molecular mechanism. We observed memory impairment and increased hippocampal neuronal apoptosis in the CCH groups, combined with inhibition of CNTF/CNTFRα/JAK2/STAT3 signaling, as compared with that of sham control rats. D3NB significantly attenuated cognitive impairment in CCH rats and decreased hippocampal neuronal apoptosis after BCCAO in vivo or OGD/R in vitro. More importantly, D3NB reversed the inhibition of CNTF/CNTFRα expression and activated the JAK2/STAT3 pathway. Additionally, JAK2/STAT3 pathway inhibitor AG490 counteracted the protective effects of D3NB in vitro. Our results suggest that D3NB could improve cognitive function after CCH and that this neuroprotective effect may be associated with reduced hippocampal neuronal apoptosis via modulation of CNTF/CNTFRα/JAK2/STAT3 signaling pathways. D3NB may be a promising therapeutic strategy for vascular cognitive impairment induced by CCH.
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Affiliation(s)
- Wenxian Li
- Department of Neurology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Di Wei
- Department of Urology, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
| | - Zheng Zhu
- Department of Internal Medicine, Division of Hematology/Oncology, University of California Davis, Sacramento, CA, United States
| | - Xiaomei Xie
- Department of Neurology, The First Affiliated Hospital, Jinan University, Guangzhou, China
| | - Shuqin Zhan
- Department of Neurology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Ru Zhang
- Department of Neurology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Guilian Zhang
- Department of Neurology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - Li'an Huang
- Department of Neurology, The First Affiliated Hospital, Jinan University, Guangzhou, China
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Zhang XM, Sun Y, Zhou YL, Jiao ZM, Yang D, Ouyang YJ, Yu MY, Li JY, Li W, Wang D, Yue H, Fu J. Therapeutic effects of dental pulp stem cells on vascular dementia in rat models. Neural Regen Res 2021; 16:1645-1651. [PMID: 33433496 PMCID: PMC8323691 DOI: 10.4103/1673-5374.303042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Dental pulp stem cells are a type of adult stem cells with strong proliferative ability and multi-differentiation potential. There are no studies on treatment of vascular dementia with dental pulp stem cells. In the present study, rat models of vascular dementia were established by two-vessel occlusion, and 30 days later, rats were injected with 2 × 107 dental pulp stem cells via the tail vein. At 70 days after vascular dementia induction, dental pulp stem cells had migrated to the brain tissue of rat vascular dementia models and differentiated into neuron-like cells. At the same time, doublecortin, neurofilament 200, and NeuN mRNA and protein expression levels in the brain tissue were increased, and glial fibrillary acidic protein mRNA and protein expression levels were decreased. Behavioral testing also revealed that dental pulp stem cell transplantation improved the cognitive function of rat vascular dementia models. These findings suggest that dental pulp stem cell transplantation is effective in treating vascular dementia possibly through a paracrine mechanism. The study was approved by the Animal Ethics Committee of Harbin Medical University (approval No. KY2017-132) in 2017.
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Affiliation(s)
- Xue-Mei Zhang
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yang Sun
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Ying-Lian Zhou
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Zhuo-Min Jiao
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Dan Yang
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yuan-Jiao Ouyang
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Mei-Yu Yu
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jin-Yue Li
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Wei Li
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Duo Wang
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Hui Yue
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jin Fu
- Department of Neurology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
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Sahu B, Mackos AR, Floden AM, Wold LE, Combs CK. Particulate Matter Exposure Exacerbates Amyloid-β Plaque Deposition and Gliosis in APP/PS1 Mice. J Alzheimers Dis 2021; 80:761-774. [PMID: 33554902 PMCID: PMC8100996 DOI: 10.3233/jad-200919] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by the accumulation of amyloid-β (Aβ) plaques, neuroinflammation, and neuronal death. There are several well-established genetic and environmental factors hypothesized to contribute to AD progression including air pollution. However, the molecular mechanisms by which air pollution exacerbates AD are unclear. OBJECTIVE This study explored the effects of particulate matter exposure on AD-related brain changes using the APP/PS1 transgenic model of disease. METHODS Male C57BL/6;C3H wild type and APP/PS1 mice were exposed to either filtered air (FA) or particulate matter sized under 2.5μm (PM2.5) for 6 h/day, 5 days/week for 3 months and brains were collected. Immunohistochemistry for Aβ, GFAP, Iba1, and CD68 and western blot analysis for PS1, BACE, APP, GFAP, and Iba1 were performed. Aβ ELISAs and cytokine arrays were performed on frozen hippocampal and cortical lysates, respectively. RESULTS The Aβ plaque load was significantly increased in the hippocampus of PM2.5-exposed APP/PS1 mice compared to their respective FA controls. Additionally, in the PM2.5-exposed APP/PS1 group, increased astrocytosis and microgliosis were observed as indicated by elevated GFAP, Iba1, and CD68 immunoreactivities. PM2.5 exposure also led to an elevation in the levels of PS1 and BACE in APP/PS1 mice. The cytokines TNF-α, IL-6, IL-1β, IFN-γ, and MIP-3α were also elevated in the cortices of PM2.5-exposed APP/PS1 mice compared to FA controls. CONCLUSION Our data suggest that chronic particulate matter exposure exacerbates AD by increasing Aβ plaque load, gliosis, and the brain inflammatory status.
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Affiliation(s)
- Bijayani Sahu
- Department of Biomedical Sciences, University of North Dakota, School of Medicine and Health Sciences, 1301 N Columbia Road, Grand Forks, ND 58202-9037
| | - Amy R. Mackos
- College of Nursing, The Ohio State University, Columbus, OH
| | - Angela M. Floden
- Department of Biomedical Sciences, University of North Dakota, School of Medicine and Health Sciences, 1301 N Columbia Road, Grand Forks, ND 58202-9037
| | - Loren E. Wold
- College of Nursing, The Ohio State University, Columbus, OH
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, OH
| | - Colin K. Combs
- Department of Biomedical Sciences, University of North Dakota, School of Medicine and Health Sciences, 1301 N Columbia Road, Grand Forks, ND 58202-9037
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Zhao B, Liu XY, Ding HJ, Zhong L, Sun Y, Hong R, Qu YY, Wang JJ, Yang XP, Sun Y, Lu M, Sun HT, Li XH. VEGF-PLGA controlled-release microspheres enhanced angiogenesis in encephalomyosynangiosis-based chronic cerebral hypoperfusion. J Clin Neurosci 2020; 81:122-132. [PMID: 33222901 DOI: 10.1016/j.jocn.2020.09.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 08/05/2020] [Accepted: 09/07/2020] [Indexed: 11/27/2022]
Abstract
Treatments enhancing angiogenesis for chronic cerebral hypoperfusion (CCH) are still in the research stage. Although encephalomyosynangiosis (EMS) is a common indirect anastomosis for the treatment of CCH, the effectiveness to promote angiogenesis is not satisfactory. Vascular endothelial growth factors (VEGF) is a cytokine found to specifically act directly on vascular endothelial cells, promote neovascularization, and enhance capillary permeability. However, the short half life and unstable property of VEGF underlies the need to explore available delivery system. In this study, poly (lactide-co-glycolide) (PLGA) was used to prepare VEGF controlled-release microspheres. In vitro and in vivo analysis of release kinetics showed that the microspheres could release VEGF continuously within 30 days. Then, modified chronic cerebral hypoperfusion rat model was established by ligation of bilateral internal carotid artery and one vertebral artery. At 14 days after ischemia, the EMS and the VEGF microspheres injection were performed. At 30 days after the injection, the result of Morris water maze displayed that combinating VEGF microspheres and EMS significantly ameliorated cognitive deficit after ischemia. We observed that combinating VEGF microspheres and EMS could further significantly increase cerebral blood flow. We speculated that this enhancement of cerebral blood flow was attributed to more angiogenesis induced by combination of VEGF microspheres and EMS, which verified by more collateral circulation with cerebral angiography and higher expression of CD31 or α-SMA. Our study demonstrated that combinating VEGF-PLGA controlled-release microspheres could significantly promote angiogenesis in EMS-based CCH rats model, providing new ideas for clinical treatment of CCH.
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Affiliation(s)
- Bin Zhao
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Xiao-Yin Liu
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin 300072, China; Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of PAPF, Tianjin 300162, China; Tianjin Medical University, Qixiangtai Road No.22, Tianjin 300070, China
| | - Hong-Jun Ding
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin 300072, China
| | - Lin Zhong
- The First Affiliated Hospital of Chengdu Medical College, 278 Middle Section of Baoguang Avenue, Chengdu 610500, China
| | - Yan Sun
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Rujun Hong
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin 300052, China; Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin 300072, China
| | - Yuan-Yuan Qu
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Jing-Jing Wang
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of PAPF, Tianjin 300162, China
| | - Xi-Ping Yang
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of PAPF, Tianjin 300162, China
| | - Yan Sun
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of PAPF, Tianjin 300162, China
| | - Mei Lu
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of PAPF, Tianjin 300162, China
| | - Hong-Tao Sun
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of PAPF, Tianjin 300162, China.
| | - Xiao-Hong Li
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin 300072, China.
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Zhu N, Liang X, Zhang M, Yin X, Yang H, Zhi Y, Ying G, Zou J, Chen L, Yao X, Li H. Astaxanthin protects cognitive function of vascular dementia. BEHAVIORAL AND BRAIN FUNCTIONS : BBF 2020; 16:10. [PMID: 33208152 PMCID: PMC7672991 DOI: 10.1186/s12993-020-00172-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 11/02/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the effect of astaxanthin (AST) on cognition function, inflammatory response and oxidative stress in vascular dementia (VD) mice. METHOD VD mice model was established by left unilateral common carotid arteries occlusion (LUCCAO). Following LUCCAO, AST was intragastrically administered for 30 days. Object recognition test and morris water maze test were used to evaluate cognitive function. Hematoxylin and eosin staining was performed to observe the hippocampal neuron structure. Enzyme-linked immunosorbent assay kit and bicinchoninic acid kit were respectively adopted to measure IL-1β and IL-4 protein expression and superoxide dismutase (SOD) activity and malondialdehyde (MDA) content in hippocampus and prefrontal cortex. RESULTS AST improved the discrimination ability of VD mice. The escape latency and path length of VD mice treated with AST were dramatically reduced. Besides, AST 200 mg/kg enhanced crossing platform time and the number of times crossing the platform quadrant, and alleviated the morphological impairment in VD mice. Moreover, we found that AST inhibited IL-1β expression and MDA content, whereas promoted IL-4 expression and SOD activity in a dose-dependent manner. CONCLUSION AST could improve cognitive impairment and hippocampal neurons in VD mice, which may be related to suppression of inflammatory response and oxidative stress.
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Affiliation(s)
- Ningwei Zhu
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Xiao Liang
- Department of Neurology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China
| | - Ming Zhang
- Department of Pharmacy, Ningbo Yinzhou No. 2 Hospital, Ningbo, 315000, Zhejiang, China
| | - Xiaolan Yin
- Department of Gastroenterology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China
| | - Hui Yang
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Yajun Zhi
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Guizhen Ying
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Jialing Zou
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Lei Chen
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Xiaokun Yao
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China
| | - Hongwei Li
- Department of Pharmacy, Zhejiang Pharmaceutical College, 888 Yinxian Road, YinZhou District, Ningbo, 315000, Zhejiang, China.
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Lana D, Ugolini F, Giovannini MG. An Overview on the Differential Interplay Among Neurons-Astrocytes-Microglia in CA1 and CA3 Hippocampus in Hypoxia/Ischemia. Front Cell Neurosci 2020; 14:585833. [PMID: 33262692 PMCID: PMC7686560 DOI: 10.3389/fncel.2020.585833] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 10/09/2020] [Indexed: 12/13/2022] Open
Abstract
Neurons have been long regarded as the basic functional cells of the brain, whereas astrocytes and microglia have been regarded only as elements of support. However, proper intercommunication among neurons-astrocytes-microglia is of fundamental importance for the functional organization of the brain. Perturbation in the regulation of brain energy metabolism not only in neurons but also in astrocytes and microglia may be one of the pathophysiological mechanisms of neurodegeneration, especially in hypoxia/ischemia. Glial activation has long been considered detrimental for survival of neurons, but recently it appears that glial responses to an insult are not equal but vary in different brain areas. In this review, we first take into consideration the modifications of the vascular unit of the glymphatic system and glial metabolism in hypoxic conditions. Using the method of triple-labeling fluorescent immunohistochemistry coupled with confocal microscopy (TIC), we recently studied the interplay among neurons, astrocytes, and microglia in chronic brain hypoperfusion. We evaluated the quantitative and morpho-functional alterations of the neuron-astrocyte-microglia triads comparing the hippocampal CA1 area, more vulnerable to ischemia, to the CA3 area, less vulnerable. In these contiguous and interconnected areas, in the same experimental hypoxic conditions, astrocytes and microglia show differential, finely regulated, region-specific reactivities. In both areas, astrocytes and microglia form triad clusters with apoptotic, degenerating neurons. In the neuron-astrocyte-microglia triads, the cell body of a damaged neuron is infiltrated and bisected by branches of astrocyte that create a microscar around it while a microglial cell phagocytoses the damaged neuron. These coordinated actions are consistent with the scavenging and protective activities of microglia. In hypoxia, the neuron-astrocyte-microglia triads are more numerous in CA3 than in CA1, further indicating their protective effects. These data, taken from contiguous and interconnected hippocampal areas, demonstrate that glial response to the same hypoxic insult is not equal but varies significantly. Understanding the differences of glial reactivity is of great interest to explain the differential susceptibility of hippocampal areas to hypoxia/ischemia. Further studies may evidence the differential reactivity of glia in different brain areas, explaining the higher or lower sensitivity of these areas to different insults and whether glia may represent a target for future therapeutic interventions.
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Affiliation(s)
- Daniele Lana
- Department of Health Sciences, Section of Clinical Pharmacology and Oncology, University of Florence, Florence, Italy
| | - Filippo Ugolini
- Department of Health Sciences, Section of Anatomopathology, University of Florence, Florence, Italy
| | - Maria G Giovannini
- Department of Health Sciences, Section of Clinical Pharmacology and Oncology, University of Florence, Florence, Italy
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Time-dependent effects of platelet-rich plasma on the memory and hippocampal synaptic plasticity impairment in vascular dementia induced by chronic cerebral hypoperfusion. Brain Res Bull 2020; 164:299-306. [DOI: 10.1016/j.brainresbull.2020.08.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 08/19/2020] [Accepted: 08/30/2020] [Indexed: 12/19/2022]
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118
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Tuo QZ, Zou JJ, Lei P. Rodent Models of Vascular Cognitive Impairment. J Mol Neurosci 2020; 71:1-12. [DOI: 10.1007/s12031-020-01733-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 10/12/2020] [Indexed: 12/23/2022]
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Yoo SW, Yun E, Bang M, Yoon U, Yoo JY, Lee KS, Shin NY, Kim JS. Blood pressure lability is associated with subcortical atrophy in early Parkinson's disease. J Hypertens 2020; 38:2043-2049. [PMID: 32890281 DOI: 10.1097/hjh.0000000000002505] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Increased cerebral white matter intensities associated with blood pressure (BP) lability were reported in patients with Parkinson's disease. However, this type of cardiovascular dysautonomia has seldom been associated with disruptions in deep gray matter structures in Parkinson's disease. In the present study, the associations between BP lability and subcortical deep gray matter structures in early Parkinson's disease were evaluated. METHODS The present study included 98 early nondemented Parkinson's disease patients. Supine and orthostatic BPs were measured using head-up tilt tests. BP variabilities, measured as standard deviations of 24-h daytime and nighttime BPs, were assessed using 24-h ambulatory BP monitoring. Every patient underwent brain MRI and measurement of deep gray matter volumes. The associations between BP lability and deep gray matter structures were analyzed. RESULTS Parkinson's disease patients with orthostatic hypotension had smaller volumes of striatum, particularly caudate, than patients without OH after adjusting for covariates of age, sex, disease duration, and Mini-Mental Status Examination score. Nocturnal BP variability was inversely associated with thalamus, hippocampus, and globus pallidus volumes. CONCLUSION The results from the present study showed that BP lability was adversely associated with structural changes in early Parkinson's disease. Different forms of BP fluctuations influenced distinct deep gray matter structures.
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Affiliation(s)
- Sang-Won Yoo
- Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul
| | - Eunkyeong Yun
- Department of Biomedical Engineering, College of Health and Medical Science, Catholic University of Daegu, Gyeongbuk
| | - Mirim Bang
- Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Uicheul Yoon
- Department of Biomedical Engineering, College of Health and Medical Science, Catholic University of Daegu, Gyeongbuk
| | - Ji-Yeon Yoo
- Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul
| | - Kwang-Soo Lee
- Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul
| | - Na-Young Shin
- Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Joong-Seok Kim
- Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul
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Chronic stepwise cerebral hypoperfusion differentially induces synaptic proteome changes in the frontal cortex, occipital cortex, and hippocampus in rats. Sci Rep 2020; 10:15999. [PMID: 32994510 PMCID: PMC7524772 DOI: 10.1038/s41598-020-72868-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 09/07/2020] [Indexed: 11/20/2022] Open
Abstract
During chronic cerebral hypoperfusion (CCH), the cerebral blood flow gradually decreases, leading to cognitive impairments and neurodegenerative disorders, such as vascular dementia. The reduced oxygenation, energy supply induced metabolic changes, and insufficient neuroplasticity could be reflected in the synaptic proteome. We performed stepwise bilateral common carotid occlusions on rats and studied the synaptic proteome changes of the hippocampus, occipital and frontal cortices. Samples were prepared and separated by 2-D DIGE and significantly altered protein spots were identified by HPLC–MS/MS. We revealed an outstanding amount of protein changes in the occipital cortex compared to the frontal cortex and the hippocampus with 94, 33, and 17 proteins, respectively. The high alterations in the occipital cortex are probably due to the hypoxia-induced retrograde degeneration of the primary visual cortex, which was demonstrated by electrophysiological experiments. Altered proteins have functions related to cytoskeletal organization and energy metabolism. As CCH could also be an important risk factor for Alzheimer’s disease (AD), we investigated whether our altered proteins overlap with AD protein databases. We revealed a significant amount of altered proteins associated with AD in the two neocortical areas, suggesting a prominent overlap with the AD pathomechanism.
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121
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Kang ZC, Wang HG, Yang YL, Zhao XY, Zhou QM, Yang YL, Yang JY, Du GH. Pinocembrin Ameliorates Cognitive Impairment Induced by Vascular Dementia: Contribution of Reelin-dab1 Signaling Pathway. DRUG DESIGN DEVELOPMENT AND THERAPY 2020; 14:3577-3587. [PMID: 32943845 PMCID: PMC7481311 DOI: 10.2147/dddt.s249176] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 06/12/2020] [Indexed: 11/23/2022]
Abstract
Background As a substrate of apoER2, Reelin has been verified to exert neuroprotection by preventing memory impairment. Pinocembrin is the most abundant natural flavonoid found in propolis, and it has been used to exert neuroprotection, blood–brain barrier protection, anti-oxidation, and inflammation diminishing, both in vitro and in vivo. However, the roles and molecular mechanisms of pinocembrin in neurobehavioral outcomes and neuronal repair after vascular dementia are still under investigation. Purpose To explore the role of pinocembrin in the involvement of the Reelin-dab1 signaling pathway in improving memory impairment, both in cell culture and animals experiments. Material and Methods Behavioral tests were conducted on day 48 to confirm the protection of pinocembrin against cognitive impairment. Cell and molecular biology experiments demonstrated that the Reelin-dab1 pathway mediates the underlying mechanism of cognitive improvement by pinocembrin. Results It was showed that pinocembrin alleviated learning and memory deficits induced by vascular dementia, by inducing the expression of Reelin, apoER2, and p-dab1 in the hippocampus. The expression of Reelin and p-dab1 was both inhibited following Reelin RNA interference in SH-SY5Y prior to oxygen glucose deprivation (OGD) injury, suggesting that Reelin played a core role in pinocembrin’s effect on OGD in vitro. Conclusion Pinocembrin improves the cognition via the Reelin-dab1 signaling pathway.
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Affiliation(s)
- Ze-Chun Kang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang City, Liaoning Province, People's Republic of China.,Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Hai-Gang Wang
- Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Yu-Lin Yang
- Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Xiao-Yue Zhao
- Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Qi-Meng Zhou
- Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Ying-Lin Yang
- Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Jing-Yu Yang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang City, Liaoning Province, People's Republic of China
| | - Guan-Hua Du
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang City, Liaoning Province, People's Republic of China.,Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
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122
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Matin N, Fisher C, Lansdell TA, Hammock BD, Yang J, Jackson WF, Dorrance AM. Soluble epoxide hydrolase inhibition improves cognitive function and parenchymal artery dilation in a hypertensive model of chronic cerebral hypoperfusion. Microcirculation 2020; 28:e12653. [PMID: 32767848 DOI: 10.1111/micc.12653] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 06/30/2020] [Accepted: 07/30/2020] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Parenchymal arterioles (PAs) regulate perfusion of the cerebral microcirculation, and impaired PA endothelium-dependent dilation occurs in dementia models mimicking chronic cerebral hypoperfusion (CCH). Epoxyeicosatrienoic acids (EETs) are vasodilators; their actions are potentiated by soluble epoxide hydrolase (sEH) inhibition. We hypothesized that chronic sEH inhibition with trifluoromethoxyphenyl-3 (1-propionylpiperidin-4-yl) urea (TPPU) would prevent cognitive dysfunction and improve PA dilation in a hypertensive CCH model. METHODS Bilateral carotid artery stenosis (BCAS) was used to induce CCH in twenty-week-old male stroke-prone spontaneously hypertensive rats (SHSRP) that were treated with vehicle or TPPU for 8 weeks. Cognitive function was assessed by novel object recognition. PA dilation and structure were assessed by pressure myography, and mRNA expression in brain tissue was assessed by qRT-PCR. RESULTS TPPU did not enhance resting cerebral perfusion, but prevented CCH-induced memory deficits. TPPU improved PA endothelium-dependent dilation but reduced the sensitivity of PAs to a nitric oxide donor. TPPU treatment had no effect on PA structure or biomechanical properties. TPPU treatment increased brain mRNA expression of brain derived neurotrophic factor, doublecortin, tumor necrosis factor-alpha, sEH, and superoxide dismutase 3, CONCLUSIONS: These data suggest that sEH inhibitors may be viable treatments for cognitive impairments associated with hypertension and CCH.
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Affiliation(s)
- Nusrat Matin
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI, USA
| | - Courtney Fisher
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI, USA
| | - Theresa A Lansdell
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI, USA
| | - Bruce D Hammock
- Department of Entomology &, University of California Comprehensive Cancer Center, Davis, CA, USA
| | - Jun Yang
- Department of Entomology &, University of California Comprehensive Cancer Center, Davis, CA, USA
| | - William F Jackson
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI, USA
| | - Anne M Dorrance
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI, USA
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Hara S, Hori M, Hagiwara A, Tsurushima Y, Tanaka Y, Maehara T, Aoki S, Nariai T. Myelin and Axonal Damage in Normal-Appearing White Matter in Patients with Moyamoya Disease. AJNR Am J Neuroradiol 2020; 41:1618-1624. [PMID: 32855183 DOI: 10.3174/ajnr.a6708] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 06/05/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND PURPOSE Although chronic ischemia is known to induce myelin and axonal damage in animal models, knowledge regarding patients with Moyamoya disease is limited. We aimed to investigate the presence of myelin and axonal damage in Moyamoya disease and their relationship with cognitive performance. MATERIALS AND METHODS Eighteen patients with Moyamoya disease (16-55 years of age) and 18 age- and sex-matched healthy controls were evaluated with myelin-sensitive MR imaging based on magnetization transfer saturation imaging and 2-shell diffusion MR imaging. The myelin volume fraction, which reflects the amount of myelin sheath; the g-ratio, which represents the ratio of the inner (axon) to the outer (axon plus myelin) diameter of the fiber; and the axon volume fraction, which reflects axonal components, were calculated and compared between the patients and controls. In the patients with Moyamoya disease, the relationship between these parameters and cognitive task-measuring performance speed was also evaluated. RESULTS Compared with the healthy controls, the patients with Moyamoya disease showed a significant decrease in the myelin and axon volume fractions (P < .05) in many WM regions, while the increases in the g-ratio values were not statistically significant. Correlations with cognitive performance were most frequently observed with the axon volume fraction (r = 0.52-0.54; P < .03 in the right middle and posterior cerebral artery areas) and were the strongest with the g-ratio values in the right posterior cerebral artery region (r = 0.64; P = .004). CONCLUSIONS Myelin-sensitive MR imaging and diffusion MR imaging revealed that myelin and axonal damage exist in patients with Moyamoya disease. The relationship with cognitive performance might be stronger with axonal damage than with myelin damage.
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Affiliation(s)
- S Hara
- From the Department of Neurosurgery (S.H., Y.T., T.M., T.N.), Tokyo Medical and Dental University, Tokyo, Japan .,Department of Radiology (S.H., M.H., A.H., Y.T., S.A.), Juntendo University, Tokyo, Japan
| | - M Hori
- Department of Radiology (S.H., M.H., A.H., Y.T., S.A.), Juntendo University, Tokyo, Japan.,Department of Diagnostic Radiology (M.H.), Toho University Omori Medical Center, Tokyo, Japan
| | - A Hagiwara
- Department of Radiology (S.H., M.H., A.H., Y.T., S.A.), Juntendo University, Tokyo, Japan
| | - Y Tsurushima
- Department of Radiology (S.H., M.H., A.H., Y.T., S.A.), Juntendo University, Tokyo, Japan.,Department of Radiology (Y.T.), Kenshinkai Tokyo Medical Clinic, Tokyo, Japan
| | - Y Tanaka
- From the Department of Neurosurgery (S.H., Y.T., T.M., T.N.), Tokyo Medical and Dental University, Tokyo, Japan
| | - T Maehara
- From the Department of Neurosurgery (S.H., Y.T., T.M., T.N.), Tokyo Medical and Dental University, Tokyo, Japan
| | - S Aoki
- Department of Radiology (S.H., M.H., A.H., Y.T., S.A.), Juntendo University, Tokyo, Japan
| | - T Nariai
- From the Department of Neurosurgery (S.H., Y.T., T.M., T.N.), Tokyo Medical and Dental University, Tokyo, Japan
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124
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Divanbeigi A, Nasehi M, Vaseghi S, Amiri S, Zarrindast MR. Tropisetron But Not Granisetron Ameliorates Spatial Memory Impairment Induced by Chronic Cerebral Hypoperfusion. Neurochem Res 2020; 45:2631-2640. [PMID: 32797381 DOI: 10.1007/s11064-020-03110-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 08/03/2020] [Accepted: 08/08/2020] [Indexed: 12/16/2022]
Abstract
Tropisetron and Granisetorn are 5-HT3 antagonists with antiemetic effects. Tropisetron also has a partial agonistic effect on alpha-7 nicotinic acetylcholine receptors (α7 nAChRs). On the other hand, chronic cerebral hypoperfusion (CCH) attenuates cerebral blood flow and impairs cognitive functions. The goal of this study was to investigate the effect of Tropisetron and Granisetron on CCH-induced spatial memory impairment in rats. Forty-eight male Wistar rats were used in this study. 2-VO surgery was done to induce CCH and Radial Eight Arm Maz apparatus was used to evaluate spatial memory (working and reference memory). Tropisetron was injected intraperitoneally at the doses of 1 and 5 mg/kg, and Granisetron was injected intraperitoneally at the dose of 3 mg/kg. Dorsal hippocampal (CA1) neurons count, Interleukin 6 (IL-6) serum level, and serotonin-reuptake transporter (SERT) gene expression were also evaluated. The results showed, CCH impaired working and reference memory, increased IL-6 serum level, and decreased CA1 neurons and SERT expression. Tropisetron at the dose of 5 mg/kg restored all the effects of CCH. However, Granisetron did not restore CCH-induced memory impairment. Furthermore, Granisetron had no effect on IL-6. While, it increased SERT expression and CA1 neurons. In conclusion, Tropisetron but not Granisetron, ameliorated spatial memory impairment induced by CCH. We suggested conducting more detailed studies investigating the role of serotonergic system (5-HT3 receptors and serotonin transporters) and also α7 nAChRs in the effects of Tropisetron.
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Affiliation(s)
- Ashkan Divanbeigi
- Department of Cognitive Neuroscience, Institute for Cognitive Science Studies (ICSS), Tehran, Iran.,Scientific Research Committee, Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Nasehi
- Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, P.O. Box 13145-784, Tehran, Iran.
| | - Salar Vaseghi
- Department of Cognitive Neuroscience, Institute for Cognitive Science Studies (ICSS), Tehran, Iran.,Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, P.O. Box 13145-784, Tehran, Iran
| | - Sepideh Amiri
- Shefa Neuroscience Research Center, Khatam Alanbia Hospital, Tehran, Iran
| | - Mohammad-Reza Zarrindast
- Department of Cognitive Neuroscience, Institute for Cognitive Science Studies (ICSS), Tehran, Iran.,Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, P.O. Box 13145-784, Tehran, Iran.,Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.,Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran
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125
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Tiang N, Ahad MA, Murugaiyah V, Hassan Z. Xanthone-enriched fraction of Garcinia mangostana and α-mangostin improve the spatial learning and memory of chronic cerebral hypoperfusion rats. J Pharm Pharmacol 2020; 72:1629-1644. [DOI: 10.1111/jphp.13345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 07/04/2020] [Indexed: 01/05/2023]
Abstract
Abstract
Objectives
Xanthones isolated from the pericarp of Garcinia mangostana has been reported to exhibit neuroprotective effect.
Methods
In this study, the effect of xanthone-enriched fraction of Garcinia mangostana (XEFGM) and α-mangostin (α-MG) were investigated on cognitive functions of the chronic cerebral hypoperfusion (CCH) rats.
Key findings
HPLC analysis revealed that XEFGM contained 55.84% of α-MG. Acute oral administration of XEFGM (25, 50 and 100 mg/kg) and α-MG (25 and 50 mg/kg) before locomotor activity and Morris water maze (MWM) tests showed no significant difference between the groups for locomotor activity.
Conclusions
However, α-MG (50 mg/kg) and XEFGM (100 mg/kg) reversed the cognitive impairment induced by CCH in MWM test. α-MG (50 mg/kg) was further tested upon sub-acute 14-day treatment in CCH rats. Cognitive improvement was shown in MWM test but not in long-term potentiation (LTP). BDNF but not CaMKII was found to be down-regulated in CCH rats; however, both parameters were not affected by α-MG. In conclusion, α-MG ameliorated learning and memory deficits in both acute and sub-acute treatments in CCH rats by improving the spatial learning but not hippocampal LTP. Hence, α-MG may be a promising lead compound for CCH-associated neurodegenerative diseases, including vascular dementia and Alzheimer's disease.
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Affiliation(s)
- Ning Tiang
- Centre for Drug Research, Universiti Sains Malaysia, Penang, Malaysia
| | | | - Vikneswaran Murugaiyah
- Discipline of Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | - Zurina Hassan
- Centre for Drug Research, Universiti Sains Malaysia, Penang, Malaysia
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126
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Song MK, Kim YJ, Lee JM, Kim YJ. Neurovascular integrative effects of long-term environmental enrichment on chronic cerebral hypoperfusion rat model. Brain Res Bull 2020; 163:160-169. [PMID: 32711044 DOI: 10.1016/j.brainresbull.2020.07.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 07/02/2020] [Accepted: 07/20/2020] [Indexed: 12/11/2022]
Abstract
Vascular dementia (VaD) is one of the most common types of dementia followed by Alzheimer's disease (AD). Recent studies showed that approximately 30 %-35 % of patients with AD at post-mortem exhibited vascular pathologies, which suggested that mixed dementia may be the most common type of dementia. Permanent bilateral common carotid artery occlusion (2VO) is a well-characterized method for investigating cognitive functions and the histopathological consequences of chronic cerebral hypoperfusion (CCH) in rats. In the present study, we investigated the effects of environmental enrichment (EE) on cognitive impairment after CCH, as well as the effects of CCH-induced neurovascular damage on cognitive function. Wistar rats were randomly allocated to a sham group, a 2VO group, and a 2VO + EE group. The 2VO procedure was performed at 12 weeks, while EE was performed for 8 weeks before and 6 weeks after 2VO. The effect of EE on cognitive functions in 2VO rats was investigated using the radial-arm maze and Morris Water Maze tests. Neurovascular integrity was assessed based on immunoreactivity for glial fibrillary acidic protein (GFAP), morphological changes in microvessels, and the expression of matrix metalloproteinase-9 (MMP-9) and zonula occludens-1 (ZO-1) in the motor cortex and hippocampus. EE ameliorated microvessel fragmentation by sustaining the tight junction through increases of ZO-1 expression after CCH, resulting in preserving the neurovascular unit. In summary, EE mitigated cognitive impairment by restoring neurovascular integrity. These findings suggest that EE can be a valuable and meaningful environmental intervention for patients with cognitive impairment.
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Affiliation(s)
- Min Kyung Song
- Department of Nursing, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Yoon Ju Kim
- Department of Nursing, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Jae-Min Lee
- Department of Nursing, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Youn-Jung Kim
- College of Nursing Science, Kyung Hee University, East-west Nursing Research Institute, Seoul, 02447, Republic of Korea.
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Ahad MA, Kumaran KR, Ning T, Mansor NI, Effendy MA, Damodaran T, Lingam K, Wahab HA, Nordin N, Liao P, Müller CP, Hassan Z. Insights into the neuropathology of cerebral ischemia and its mechanisms. Rev Neurosci 2020; 31:521-538. [DOI: 10.1515/revneuro-2019-0099] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 01/09/2020] [Indexed: 11/15/2022]
Abstract
AbstractCerebral ischemia is a result of insufficient blood flow to the brain. It leads to limited supply of oxygen and other nutrients to meet metabolic demands. These phenomena lead to brain damage. There are two types of cerebral ischemia: focal and global ischemia. This condition has significant impact on patient’s health and health care system requirements. Animal models such as transient occlusion of the middle cerebral artery and permanent occlusion of extracranial vessels have been established to mimic the conditions of the respective type of cerebral ischemia and to further understand pathophysiological mechanisms of these ischemic conditions. It is important to understand the pathophysiology of cerebral ischemia in order to identify therapeutic strategies for prevention and treatment. Here, we review the neuropathologies that are caused by cerebral ischemia and discuss the mechanisms that occur in cerebral ischemia such as reduction of cerebral blood flow, hippocampal damage, white matter lesions, neuronal cell death, cholinergic dysfunction, excitotoxicity, calcium overload, cytotoxic oedema, a decline in adenosine triphosphate (ATP), malfunctioning of Na+/K+-ATPase, and the blood-brain barrier breakdown. Altogether, the information provided can be used to guide therapeutic strategies for cerebral ischemia.
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Affiliation(s)
- Mohamad Anuar Ahad
- Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Kesevan Rajah Kumaran
- Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Tiang Ning
- Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Nur Izzati Mansor
- Medical Genetics Unit, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
- Genetics and Regenerative Medicine Research Centre, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | | | - Thenmoly Damodaran
- Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Kamilla Lingam
- Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Habibah Abdul Wahab
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia
- USM-RIKEN Centre for Aging Science (URICAS), Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia
| | - Norshariza Nordin
- Medical Genetics Unit, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
- Genetics and Regenerative Medicine Research Centre, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Ping Liao
- Calcium Signaling Laboratory, National Neuroscience Institute, Singapore 308433, Singapore
| | - Christian P. Müller
- Section of Addiction Medicine, Department of Psychiatry and Psychotherapy, University Clinic, Friedrich Alexander University Erlangen-Nuremberg, Schwabachanlage 6, D-91054 Erlangen, Germany
| | - Zurina Hassan
- Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia
- USM-RIKEN Centre for Aging Science (URICAS), Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia
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128
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Damodaran T, Cheah PS, Murugaiyah V, Hassan Z. The nootropic and anticholinesterase activities of Clitoria ternatea Linn. root extract: Potential treatment for cognitive decline. Neurochem Int 2020; 139:104785. [PMID: 32650028 DOI: 10.1016/j.neuint.2020.104785] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 06/04/2020] [Accepted: 06/10/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND Clitoria ternatea (CT) is an herbal plant that has been used as a memory booster in folk medicine. CT root extract has been proven to restore chronic cerebral hypoperfusion (CCH)-induced memory deficits in a rat model, but the underlying mechanisms and the toxicity profile following repeated exposure have yet to be explored. THE AIM OF THE STUDY To investigate the effects of the chronic (28 days) oral administration of CT root extract on CCH-induced cognitive impairment, neuronal damage and cholinergic deficit, and its toxicity profile in the CCH rat model. MATERIALS AND METHODS The permanent bilateral occlusion of common carotid arteries (PBOCCA) surgery method was employed to develop a CCH model in male Sprague Dawley (SD) rats. Then, these rats were given oral administration of CT root extract at doses of 100, 200, and 300 mg/kg, respectively for 28 days and subjected to behavioural tests. At the end of the experiment, the brain was harvested for histological analysis and cholinesterase activities. Then, blood samples were collected and organs such as liver, kidney, lung, heart, and spleen were procured for toxicity assessment. RESULTS Chronic treatment of CT root extract at doses of 200 and 300 mg/kg, restored memory impairments induced by CCH. CT root extract was also found to diminish CCH-induced neuronal damage in the CA1 region of the hippocampus. High dose (300 mg/kg) of the CT root extract was significantly inhibited the increased acetylcholinesterase (AChE) activity in the frontal cortex and hippocampus of the PBOCCA rats. In toxicity study, repeated doses of CT root extract were found to be safe in PBOCCA rats after 28 days of treatment. CONCLUSIONS Our findings provided scientific evidence supporting the therapeutic potential of CT root extract in the treatment of vascular dementia (VaD)-related cholinergic abnormalities and subsequent cognitive decline.
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Affiliation(s)
- Thenmoly Damodaran
- Centre for Drug Research, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Pike See Cheah
- Department of Human Anatomy, Faculty of Medicine and Health Sciences, University Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| | - Vikneswaran Murugaiyah
- Discipline of Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Zurina Hassan
- Centre for Drug Research, Universiti Sains Malaysia, 11800, Penang, Malaysia.
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129
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TRPM4 inhibition improves spatial memory impairment and hippocampal long-term potentiation deficit in chronic cerebral hypoperfused rats. Behav Brain Res 2020; 393:112781. [PMID: 32619565 DOI: 10.1016/j.bbr.2020.112781] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 06/09/2020] [Accepted: 06/16/2020] [Indexed: 12/11/2022]
Abstract
Chronic cerebral hypoperfusion (CCH) been well characterized as a common pathological status contributing to neurodegenerative diseases such as Alzheimer's disease and vascular dementia. CCH is an important factor that leads to cognitive impairment, but the underlying neurobiological mechanism is poorly understood and no effective treatment is available. Recently, transient receptor potential melastatin 4 (TRPM4) cation channel has been identified as an important molecular element in focal cerebral ischemia. Over activation of the channel is a major molecular mechanism of oncotic cell death. However, the role of TRPM4 in CCH that propagates global brain hypoxia have not been explored. Therefore, the present study is designed to investigate the effect of TRPM4 inhibition on the cognitive functions of the rats following CCH via permanent bilateral occlusion of common carotid arteries (PBOCCA) model. In this model, treatment with siRNA suppressed TRPM4 expression at both the mRNA and protein levels and improved cognitive deficits of the CCH rats without affecting their motor function. Furthermore, treatment with siRNA rescued the LTP impairment in CCH-induced rats. Consistent with the restored of LTP, western blot analysis revealed that siRNA treatment prevented the reduction of synaptic proteins, including calcium/calmodulin-dependent kinase II alpha (CaMKIIα) and brain-derived neurotrophic factor (BDNF) in brain regions of CCH rats. The present findings provide a novel role of TRPM4 in restricting cognitive functions in CCH and suggest inhibiting TRPM4 may represent a promising therapeutic strategy in targeting ion channels to prevent the progression of cognitive deficits induced by ischemia.
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130
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Niu HM, Ma DL, Wang MY, Chen XP, Zhang L, Li YL, Zhang L, Li L. Epimedium flavonoids protect neurons and synapses in the brain via activating NRG1/ErbB4 and BDNF/Fyn signaling pathways in a chronic cerebral hypoperfusion rat model. Brain Res Bull 2020; 162:132-140. [PMID: 32592805 DOI: 10.1016/j.brainresbull.2020.06.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/02/2020] [Accepted: 06/19/2020] [Indexed: 12/20/2022]
Abstract
Cerebral hypoperfusion is a common feature of cerebral small vascular disease (CSVD), which has been considered as one of the causes of cognitive decline in recent years. Epimedium flavonoids (EF) are the main ingredients extracted from Epimedium. The purpose of this study was to investigate the effects of EF on cognitive impairment, and the underlying mechanisms in rats with permanent occlusion of the bilateral common carotid artery (2VO). EF (50, 100, and 200 mg/kg) was intragastrically administered for 12 weeks starting 2 weeks after 2VO surgery. The results showed that EF treatment improved learning and memory impairment in 2VO rats evaluated by novel object recognition and Y-maze tests. NeuN immunohistochemical staining indicated that EF alleviated neuronal loss in the hippocampus and cerebral cortex of 2VO rats. MAP-2 immunofluorescence staining and western blotting showed that EF protected neuronal dendrites and increased the expression of cytoskeleton proteins MAP-2 and NF200 in the hippocampus of 2VO rats. Moreover, EF protected the synapse ultrastructure detected by transmission electron microscopy, and increased the expression of synaptic plasticity-related proteins, including synaptophysin, synaptotagmin-I, synapsin I, PSD-95, p-NMDA2B, and p-CaMKII-α in the hippocampus of 2VO rats. In addition, EF increased the expression of neuregulin-1 (NRG-1), p-ErbB4, brain-derived neurotrophic factor (BDNF), p-Fyn, PI3K, p-Akt, and p-CREB in the hippocampus of 2VO rats. These results suggest that EF may protect neurons and synapses by activating the NRG1/ErbB4, BDNF/Fyn, and P13 K/Akt/CREB pathways in the hippocampus and cerebral cortex, thus improving cognitive impairment induced by chronic cerebral hypoperfusion. EF may be a potential candidate drug for chronic cerebral hypoperfusion and CSVD therapy.
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Affiliation(s)
- Hong-Mei Niu
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Deng-Lei Ma
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Ming-Yang Wang
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Xiao-Ping Chen
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Li Zhang
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Ya-Li Li
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Lan Zhang
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China
| | - Lin Li
- Department of Pharmacy, Xuanwu Hospital of Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing Engineering Research Center for Nerve System Drugs, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of Ministry of Education, Beijing, 100053, China.
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Zhang S, Yan ML, Yang L, An XB, Zhao HM, Xia SN, Jin Z, Huang SY, Qu Y, Ai J. MicroRNA-153 impairs hippocampal synaptic vesicle trafficking via downregulation of synapsin I in rats following chronic cerebral hypoperfusion. Exp Neurol 2020; 332:113389. [PMID: 32580014 DOI: 10.1016/j.expneurol.2020.113389] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 05/02/2020] [Accepted: 06/18/2020] [Indexed: 02/07/2023]
Abstract
Chronic cerebral hypoperfusion (CCH) promotes the development of Alzheimer's pathology. However, whether and how CCH impairs the synaptic vesicle trafficking is still unclear. In the present study, we found that the hippocampal glutamatergic vesicle trafficking was impaired as indicated by a significant shortened delayed response enhancement (DRE) phase in CA3-CA1 circuit and decreased synapsin I in CCH rats suffering from bilateral common carotid artery occlusion (2VO). Further study showed an upregulated miR-153 in the hippocampus of 2VO rats. In vitro, overexpression of miR-153 downregulated synapsin I by binding the 3'UTRs of SYN1 mRNAs, which was prevented by its antisense AMO-153 and miRNA-masking antisense oligodeoxynucleotides (SYN1-ODN). In vivo, the upregulation of miR-153 elicited similar reduced DRE phase and synapsin I deficiency as CCH. Furthermore, miR-153 knockdown rescued the downregulated synapsin I and shortened DRE phase in 2VO rats. Our results demonstrate that CCH impairs hippocampal glutamatergic vesicle trafficking by upregulating miR-153, which suppresses the expression of synapsin I at the post-transcriptional level. These results will provide important references for drug research and treatment of vascular dementia.
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Affiliation(s)
- Shuai Zhang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Mei-Ling Yan
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Lin Yang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Xiao-Bin An
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Hong-Mei Zhao
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Sheng-Nan Xia
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Zhuo Jin
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Si-Yu Huang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Yang Qu
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Jing Ai
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, Heilongjiang Province 150086, China.
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Pál É, Hricisák L, Lékai Á, Nagy D, Fülöp Á, Erben RG, Várbíró S, Sándor P, Benyó Z. Ablation of Vitamin D Signaling Compromises Cerebrovascular Adaptation to Carotid Artery Occlusion in Mice. Cells 2020; 9:cells9061457. [PMID: 32545499 PMCID: PMC7349396 DOI: 10.3390/cells9061457] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 06/09/2020] [Accepted: 06/10/2020] [Indexed: 12/14/2022] Open
Abstract
Vitamin D insufficiency has been associated with increased incidence and severity of cerebrovascular disorders. We analyzed the impact of impaired vitamin D signaling on the anatomical and functional aspects of cerebrovascular adaptation to unilateral carotid artery occlusion (CAO), a common consequence of atherosclerosis and cause of ischemic stroke. Cerebrocortical blood flow (CoBF) showed a significantly increased drop and delayed recovery after CAO in mice carrying a functionally inactive vitamin D receptor (VDR) with the most sustained perfusion deficit in the temporal cortex. To identify the cause(s) for this altered adaptation, the extent of compensatory blood flow increase in the contralateral carotid artery and the morphology of pial collaterals between the anterior and middle cerebral arteries were determined. Whereas VDR deficiency had no significant influence on the contralateral carotid arterial blood flow increase, it was associated with decreased number and increased tortuosity of pial anastomoses resulting in unfavorable changes of the intracranial collateral circulation. These results indicate that VDR deficiency compromises the cerebrovascular adaptation to CAO with the most sustained consequences in the temporal cortex. The dysregulation can be attributed to the altered development and function of pial collateral circulation whereas extracranial vessels may not be impaired.
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Affiliation(s)
- Éva Pál
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
- Correspondence: (É.P.); (Z.B.); Tel.: +36-1-210-0306 (É.P.); +36-1-210-0306 (Z.B.)
| | - László Hricisák
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
| | - Ágnes Lékai
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
| | - Dorina Nagy
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
| | - Ágnes Fülöp
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
| | - Reinhold G. Erben
- Department of Biomedical Sciences, University of Veterinary Medicine Vienna, 1210 Vienna, Austria;
| | - Szabolcs Várbíró
- Department of Obstetrics and Gynecology, Semmelweis University, 1082 Budapest, Hungary;
| | - Péter Sándor
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
| | - Zoltán Benyó
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary; (L.H.); (Á.L.); (D.N.); (Á.F.); (P.S.)
- Correspondence: (É.P.); (Z.B.); Tel.: +36-1-210-0306 (É.P.); +36-1-210-0306 (Z.B.)
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Jun YH, Ju GS, Chung YY, Shin HK, Kim DJ, Choi MS, Kim ST, Son KM. Differential Expression of Vascular Endothelial Growth Factor in the Cortex and Hippocampus upon Cerebral Hypoperfusion. In Vivo 2020; 34:191-197. [PMID: 31882479 DOI: 10.21873/invivo.11761] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 10/02/2019] [Accepted: 10/15/2019] [Indexed: 12/19/2022]
Abstract
BACKGROUND/AIM Vascular endothelial growth factor (VEGF) provides tolerance against ischemic brain injury, yet, the pattern of VEGF expression in the neurogenic zones following chronic cerebral hypoperfusion has not been studied. Here we evaluated the immunoreactivity of VEGF in a rat model of chronic cerebral hypoperfusion. MATERIALS AND METHODS Chronic hypoperfusion was induced by bilateral common carotid artery ligation in rats. Immunohistochemistry was performed against hypoxia-inducible factor-1α (HIF-1α) and VEGF on brain sections. RESULTS The density of HIF1α-positive cells in the hypoxia group was increased in the cerebral cortex and hippocampus. Further, the density of VEGF-positive cells was significantly higher in the hypoxia group compared to the control group in the cerebral cortex whereas it was similar in the subventricular zone, and in the dentate gyrus in the hippocampus between the two groups. CONCLUSION The pattern of VEGF expression varies in different brain regions following chronic cerebral hypoperfusion.
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Affiliation(s)
- Yong Hyun Jun
- Department of Anatomy, School of Medicine, Chosun University, Gwang-ju, Republic of Korea
| | - Gang San Ju
- Department of Plastic and Reconstructive Surgery, Chosun University Hospital, Gwang-ju, Republic of Korea
| | - Yoon Young Chung
- Department of Anatomy, School of Medicine, Chosun University, Gwang-ju, Republic of Korea
| | - Hye-Kyoung Shin
- Department of Anatomy, School of Medicine, Chosun University, Gwang-ju, Republic of Korea
| | - Dong-Joon Kim
- Department of Anesthesiology and Pain Medicine, Chosun University Hospital, Gwang-ju, Republic of Korea
| | - Min Seon Choi
- Department of Pediatrics, Chosun University Hospital, Gwang-ju, Republic of Korea
| | - Seong Taeck Kim
- Department of Ophthalmology, Chosun University Hospital, Gwang-ju, Republic of Korea
| | - Kyung Min Son
- Department of Plastic and Reconstructive Surgery, Chosun University Hospital, Gwang-ju, Republic of Korea
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Epimedium flavonoids improve cognitive impairment and white matter lesions induced by chronic cerebral hypoperfusion through inhibiting the Lingo-1/Fyn/ROCK pathway and activating the BDNF/NRG1/PI3K pathway in rats. Brain Res 2020; 1743:146902. [PMID: 32446949 DOI: 10.1016/j.brainres.2020.146902] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 05/09/2020] [Accepted: 05/18/2020] [Indexed: 01/24/2023]
Abstract
Chronic cerebral hypoperfusion is a common cause of cerebral small vascular disease (CSVD). White matter (WM) lesions are the typical pathological manifestation of CSVD and contribute to cognitive decline. Epimedium flavonoids (EF) are the main component in Epimedium brevicornu Maxim., which is commonly used in traditional Chinese medicine. The purpose of this study was to investigate the effects of EF on cognitive impairment and the underlying mechanisms in a CSVD rat model induced with chronic cerebral hypoperfusion. The model was established by permanent bilateral common carotid artery occlusion (2VO) in rats. EF (50, 100, and 200 mg/kg) was intragastrically administered once a day for 12 weeks starting 2 weeks after 2VO surgery. The learning and memory capacity of the rats were measured using the Morris water maze and step-through tests. WM lesions were observed by MRI-diffusion tensor imaging, transmission electron microscopy, and LFB staining. Oligodendrocytes were detected by immunohistochemistry. Western blotting assay was used to determine the level of protein expression. The results showed that EF significantly improved learning and memory impairment, alleviated WM nerve fiber injuries and demyelination, and increased the number of mature oligodendrocytes in the corpus callosum, subcortical WM, and periventricular WM in 2VO rats. Mechanistically, EF reduced the expression of Lingo-1 and ROCK2 and increased the levels of phosphorylated (p-) Fyn, brain-derived neurotrophic factor (BDNF), TrkB, neuregulin-1 (NRG-1), p-ErbB4, PI3K p85 and p110α, p-Akt, and p-CREB in the corpus callosum of 2VO rats. These results suggest that EF may improve cognitive impairment and WM lesions induced by chronic cerebral hypoperfusion through inhibiting the Lingo-1/Fyn/ROCK pathway and activating the BDNF/TrkB, NRG-1/ErbB4, and the downstream PI3K/Akt/CREB pathways in WM. Thus, EF can be used as a potential neuroprotective agent in CSVD therapy.
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Auchter AM, Barrett DW, Monfils MH, Gonzalez-Lima F. Methylene Blue Preserves Cytochrome Oxidase Activity and Prevents Neurodegeneration and Memory Impairment in Rats With Chronic Cerebral Hypoperfusion. Front Cell Neurosci 2020; 14:130. [PMID: 32508596 PMCID: PMC7251060 DOI: 10.3389/fncel.2020.00130] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 04/20/2020] [Indexed: 01/01/2023] Open
Abstract
Chronic cerebral hypoperfusion in neurocognitive disorders diminishes cytochrome oxidase activity leading to neurodegenerative effects and impairment of learning and memory. Methylene blue at low doses stimulates cytochrome oxidase activity and may thus counteract the adverse effects of cerebral hypoperfusion. However, the effects of methylene blue on cytochrome oxidase activity during chronic cerebral hypoperfusion have not been described before. To test this hypothesis, rats underwent bilateral carotid artery occlusion or sham surgery, received daily 4 mg/kg methylene blue or saline injections, and learned a visual water task. Brain mapping of cytochrome oxidase activity was done by quantitative enzyme histochemistry. Permanent carotid occlusion for 1 month resulted in decreased cytochrome oxidase activity in visual cortex, prefrontal cortex, perirhinal cortex, hippocampus and amygdala, and weaker interregional correlation of cytochrome oxidase activity between these regions. Methylene blue preserved cytochrome oxidase activity in regions affected by carotid occlusion and strengthened their interregional correlations of cytochrome oxidase activity, which prevented neurodegenerative effects and facilitated task-specific learning and memory. Brain-behavior correlations revealed positive correlations between performance and brain regions in which cytochrome oxidase activity was preserved by methylene blue. These results are the first to demonstrate that methylene blue prevents neurodegeneration and memory impairment by preserving cytochrome oxidase activity and interregional correlation of cytochrome oxidase activity in brain regions susceptible to chronic hypoperfusion. This demonstration provides further support for the hypothesis that lower cerebral blood flow results in an Alzheimer's-like syndrome and that stimulating cytochrome oxidase activity with low-dose methylene blue is neuroprotective.
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Affiliation(s)
| | | | | | - F. Gonzalez-Lima
- Department of Psychology, Institute for Neuroscience, The University of Texas at Austin, Austin, TX, United States
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Donepezil attenuates vascular dementia in rats through increasing BDNF induced by reducing HDAC6 nuclear translocation. Acta Pharmacol Sin 2020; 41:588-598. [PMID: 31913348 PMCID: PMC7470853 DOI: 10.1038/s41401-019-0334-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 11/18/2019] [Indexed: 02/07/2023] Open
Abstract
Vascular dementia (VD) is the second most common dementia disease after Alzheimer's diseases (AD) in the world. Donepezil is used to treat mild to moderate AD, and it has been shown to treat cognitive impairment and memory deficits caused by VD. However, the action mechanism of donepezil against VD has not been clarified. In this study, a bilateral common carotid artery occlusion (BCCAO) model was established in rats to simulate the pathology of VD. Two weeks after the surgery, the rats were administered donepezil (10 mg · kg-1 · d-1, ig) for 3 weeks, and then subjected to behavioral tests. We showed that donepezil treatment significantly improved the performance of BCCAO rats in Morris Water Mazes test and Step-down test. Furthermore, we showed that donepezil treatment significantly attenuated neurodegeneration and restored the synapse dendritic spines density in cortex and hippocampus. We revealed that donepezil treatment significantly increased BDNF expression in cortex and hippocampus. Interestingly, donepezil treatment significantly decreased nuclear translocation of HDAC6 and the binding between HDAC6 and BDNF promoter IV in cortex, but not in the hippocampus. The attenuated neurodegeneration by donepezil in cortex and hippocampus might due to the reduced ROS levels and increased phosphorylation of AMPK, whereas increased phosphorylation of AKT was only detected in cortex. In conclusion, our results demonstrate that donepezil attenuates neurodegeneration in cortex and hippocampus via increasing BDNF expression; the regulation of donepezil on HDAC6 occurred in cortex, but not in the hippocampus. This study further clarifies the pharmacological mechanism of donepezil, while also emphasizes the promising epigenetic regulation of HDAC6.
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Heterogeneous Disease Progression in a Mouse Model of Vascular Cognitive Impairment. Int J Mol Sci 2020; 21:ijms21082820. [PMID: 32316637 PMCID: PMC7215687 DOI: 10.3390/ijms21082820] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/12/2020] [Accepted: 04/15/2020] [Indexed: 11/17/2022] Open
Abstract
Recently, an asymmetric vascular compromise approach that replicates many aspects of human vascular cognitive impairment (VCI) has been reported. The present study aimed to first investigate on the reproducibility in the disease progression of this newly reported VCI model using wild-type C57BL6/J mice. The second aim was to assess how this approach will affect the disease progression of transgenic Alzheimer’s disease (AD) 5XFAD mice subjected to VCI. C57BL6/J and 5XFAD mice were subjected to VCI by placing an ameroid constrictor on the right CCA and a microcoil on the left CCA. Infarcts and hippocampal neuronal loss did not appear predominantly in the right (ameroid side) as expected but randomly in both hemispheres. The mortality rate of C57BL6/J mice was unexpectedly high. Inducing VCI reduced amyloid burden in the hippocampi of 5XFAD mice. Since VCI is known to be complex and complicated, the heterogeneous disease progression observed from this current study shares close resemblance to the clinical manifestation of VCI. This heterogeneity, however, makes it challenging to test novel treatment options using this model. Further study is warranted to tackle the heterogeneous nature of VCI.
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Leardini-Tristão M, Andrade G, Garcia C, Reis PA, Lourenço M, Moreira ETS, Lima FRS, Castro-Faria-Neto HC, Tibirica E, Estato V. Physical exercise promotes astrocyte coverage of microvessels in a model of chronic cerebral hypoperfusion. J Neuroinflammation 2020; 17:117. [PMID: 32299450 PMCID: PMC7161182 DOI: 10.1186/s12974-020-01771-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 03/12/2020] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Brain circulation disorders such as chronic cerebral hypoperfusion have been associated with a decline in cognitive function during the development of dementia. Astrocytes together with microglia participate in the immune response in the CNS and make them potential sentinels in the brain parenchyma. In addition, astrocytes coverage integrity has been related to brain homeostasis. Currently, physical exercise has been proposed as an effective intervention to promote brain function improvement. However, the neuroprotective effects of early physical exercise on the astrocyte communication with the microcirculation and the microglial activation in a chronic cerebral hypoperfusion model are still unclear. The aim of this study was to investigate the impact of early intervention with physical exercise on cognition, brain microcirculatory, and inflammatory parameters in an experimental model of chronic cerebral hypoperfusion induced by permanent bilateral occlusion of the common carotid arteries (2VO). METHODS Wistar rats aged 12 weeks were randomly divided into four groups: Sham-sedentary group (Sham-Sed), Sham-exercised group (Sham-Ex), 2VO-sedentary group (2VO-Sed), and 2VO-exercised group (2VO-Ex). The early intervention with physical exercise started 3 days after 2VO or Sham surgery during 12 weeks. Then, the brain functional capillary density and endothelial-leukocyte interactions were evaluated by intravital microscopy; cognitive function was evaluated by open-field test; hippocampus postsynaptic density protein 95 and synaptophysin were evaluated by western blotting; astrocytic coverage of the capillaries, microglial activation, and structural capillary density were evaluated by immunohistochemistry. RESULTS Early moderate physical exercise was able to normalize functional capillary density and reduce leukocyte rolling in the brain of animals with chronic cerebral hypoperfusion. These effects were accompanied by restore synaptic protein and the improvement of cognitive function. In addition, early moderate exercise improves astrocytes coverage in blood vessels of the cerebral cortex and hippocampus, decreases microglial activation in the hippocampus, and improves structural capillaries in the hippocampus. CONCLUSIONS Microcirculatory and inflammatory changes in the brain appear to be involved in triggering a cognitive decline in animals with chronic cerebral ischemia. Therefore, early intervention with physical exercise may represent a preventive approach to neurodegeneration caused by chronic cerebral hypoperfusion.
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Affiliation(s)
- Marina Leardini-Tristão
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil
- Laboratory of Cardiovascular Investigation, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Giulia Andrade
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil
- Laboratory of Cardiovascular Investigation, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Celina Garcia
- Laboratory of Glial Cell Biology, Biomedical Sciences Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Patrícia A Reis
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil
| | - Millena Lourenço
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil
| | - Emilio T S Moreira
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil
| | - Flavia R S Lima
- Laboratory of Glial Cell Biology, Biomedical Sciences Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Hugo C Castro-Faria-Neto
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil
| | - Eduardo Tibirica
- Laboratory of Cardiovascular Investigation, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- National Institute of Cardiology, Rio de Janeiro, Brazil
| | - Vanessa Estato
- Laboratory of Immunopharmacology, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, 21040-900, Brazil.
- Laboratory of Cardiovascular Investigation, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil.
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Yan ML, Zhang S, Zhao HM, Xia SN, Jin Z, Xu Y, Yang L, Qu Y, Huang SY, Duan MJ, Mao M, An XB, Mishra C, Zhang XY, Sun LH, Ai J. MicroRNA-153 impairs presynaptic plasticity by blocking vesicle release following chronic brain hypoperfusion. Cell Commun Signal 2020; 18:57. [PMID: 32252776 PMCID: PMC7137307 DOI: 10.1186/s12964-020-00551-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 03/11/2020] [Indexed: 12/20/2022] Open
Abstract
Background Chronic brain hypoperfusion (CBH) is closely related to Alzheimer’s disease (AD) and vascular dementia (VaD). Meanwhile, synaptic pathology plays a prominent role in the initial stage of AD and VaD. However, whether and how CBH impairs presynaptic plasticity is currently unclear. Methods In the present study, we performed a battery of techniques, including primary neuronal culture, patch clamp, stereotaxic injection of the lentiviral vectors, morris water maze (MWM), dual luciferase reporter assay, FM1–43 fluorescence dye evaluation, qRT-PCR and western blot, to investigate the regulatory effect of miR-153 on hippocampal synaptic vesicle release both in vivo and in vitro. The CBH rat model was generated by bilateral common carotid artery ligation (2VO). Results Compared to sham rats, 2VO rats presented decreased field excitatory postsynaptic potential (fEPSP) amplitude and increased paired-pulse ratios (PPRs) in the CA3-CA1 pathway, as well as significantly decreased expression of multiple vesicle fusion-related proteins, including SNAP-25, VAMP-2, syntaxin-1A and synaptotagmin-1, in the hippocampi. The levels of microRNA-153 (miR-153) were upregulated in the hippocampi of rats following 2VO surgery, and in the plasma of dementia patients. The expression of the vesicle fusion-related proteins affected by 2VO was inhibited by miR-153, elevated by miR-153 inhibition, and unchanged by binding-site mutation or miR masks. FM1–43 fluorescence images showed that miR-153 blunted vesicle exocytosis, but this effect was prevented by either 2′-O-methyl antisense oligoribonucleotides to miR-153 (AMO-153) and miR-masking of the miR-153 binding site in the 3′ untranslated region (3’UTR) of the Snap25, Vamp2, Stx1a and Syt1 genes. Overexpression of miR-153 by lentiviral vector-mediated miR-153 mimics (lenti-pre-miR-153) decreased the fEPSP amplitude and elevated the PPR in the rat hippocampus, whereas overexpression of the antisense molecule (lenti-AMO-153) reversed these changes triggered by 2VO. Furthermore, lenti-AMO-153 attenuated the cognitive decline of 2VO rats. Conclusions Overexpression of miR-153 controls CBH-induced presynaptic vesicle release impairment by posttranscriptionally regulating the expression of four vesicle release-related proteins by targeting the 3’UTRs of the Stx1a, Snap25, Vamp2 and Syt1 genes. These findings identify a novel mechanism of presynaptic plasticity impairment during CBH, which may be a new drug target for prevention or treatment of AD and VaD. Video Abstract
Graphical abstract ![]()
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Affiliation(s)
- Mei-Ling Yan
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Shuai Zhang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Hong-Mei Zhao
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Sheng-Nan Xia
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Zhuo Jin
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Yi Xu
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Lin Yang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Yang Qu
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Si-Yu Huang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Ming-Jing Duan
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Meng Mao
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Xiao-Bin An
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Chandan Mishra
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Xin-Yu Zhang
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Li-Hua Sun
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China
| | - Jing Ai
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), College of Pharmacy of Harbin Medical University, Harbin, 150086, Heilongjiang Province, China.
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Role of HMGB1 in an Animal Model of Vascular Cognitive Impairment Induced by Chronic Cerebral Hypoperfusion. Int J Mol Sci 2020; 21:ijms21062176. [PMID: 32245271 PMCID: PMC7139598 DOI: 10.3390/ijms21062176] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 03/20/2020] [Indexed: 01/10/2023] Open
Abstract
The pathophysiology of vascular cognitive impairment (VCI) is associated with chronic cerebral hypoperfusion (CCH). Increased high-mobility group box protein 1 (HMGB1), a nonhistone protein involved in injury and inflammation, has been established in the acute phase of CCH. However, the role of HMGB1 in the chronic phase of CCH remains unclear. We developed a novel animal model of CCH with a modified bilateral common carotid artery occlusion (BCCAO) in C57BL/6 mice. Cerebral blood flow (CBF) reduction, the expression of HMGB1 and its proinflammatory cytokines (tumor necrosis factor-alpha [TNF-α], interleukin [IL]-1β, and IL-6), and brain pathology were assessed. Furthermore, we evaluated the effect of HMGB1 suppression through bilateral intrahippocampus injection with the CRISPR/Cas9 knockout plasmid. Three months after CCH induction, CBF decreased to 30–50% with significant cognitive decline in BCCAO mice. The 7T-aMRI showed hippocampal atrophy, but amyloid positron imaging tomography showed nonsignificant amyloid-beta accumulation. Increased levels of HMGB1, TNF-α, IL-1β, and IL-6 were observed 3 months after BCCAO. HMGB1 suppression with CRISPR/Cas9 knockout plasmid restored TNF-α, IL-1β, and IL-6 and attenuated hippocampal atrophy and cognitive decline. We believe that HMGB1 plays a pivotal role in CCH-induced VCI pathophysiology and can be a potential therapeutic target of VCI.
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Transplantation of Stem Cells from Human Exfoliated Deciduous Teeth Decreases Cognitive Impairment from Chronic Cerebral Ischemia by Reducing Neuronal Apoptosis in Rats. Stem Cells Int 2020; 2020:6393075. [PMID: 32215019 PMCID: PMC7079222 DOI: 10.1155/2020/6393075] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 01/24/2020] [Accepted: 02/05/2020] [Indexed: 02/08/2023] Open
Abstract
Stem cells from human exfoliated deciduous teeth (SHED) are a unique postnatal stem cell population with high self-renewal ability that originates from the cranial neural crest. Since SHED are homologous to the central nervous system, they possess superior capacity to differentiate into neural cells. However, whether and how SHED ameliorate degenerative central nervous disease are unclear. Chronic cerebral ischemia (CCI) is a kind of neurological disease caused by long-term cerebral circulation insufficiency and is characterized by progressive cognitive and behavioral deterioration. In this study, we showed that either systemic transplantation of SHED or SHED infusion into the hippocampus ameliorated cognitive impairment of CCI rats in four weeks after SHED treatment by rescuing the number of neurons in the hippocampus area. Mechanistically, SHED transplantation decreased the apoptosis of neuronal cells in the hippocampus area of CCI rats through downregulation of cleaved caspase-3. In summary, SHED transplantation protected the neuronal function and reduced neuronal apoptosis, resulting in amelioration of cognitive impairment from CCI. Our findings suggest that SHED are a promising stem cell source for cell therapy of neurological diseases in the clinic.
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Moretti R, Caruso P. Small Vessel Disease-Related Dementia: An Invalid Neurovascular Coupling? Int J Mol Sci 2020; 21:E1095. [PMID: 32046035 PMCID: PMC7036993 DOI: 10.3390/ijms21031095] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 02/04/2020] [Accepted: 02/04/2020] [Indexed: 12/18/2022] Open
Abstract
The arteriosclerosis-dependent alteration of brain perfusion is one of the major determinants in small vessel disease, since small vessels have a pivotal role in the brain's autoregulation. Nevertheless, as far as we know, endothelium distress can potentiate the flow dysregulation and lead to subcortical vascular dementia that is related to small vessel disease (SVD), also being defined as subcortical vascular dementia (sVAD), as well as microglia activation, chronic hypoxia and hypoperfusion, vessel-tone dysregulation, altered astrocytes, and pericytes functioning blood-brain barrier disruption. The molecular basis of this pathology remains controversial. The apparent consequence (or a first event, too) is the macroscopic alteration of the neurovascular coupling. Here, we examined the possible mechanisms that lead a healthy aging process towards subcortical dementia. We remarked that SVD and white matter abnormalities related to age could be accelerated and potentiated by different vascular risk factors. Vascular function changes can be heavily influenced by genetic and epigenetic factors, which are, to the best of our knowledge, mostly unknown. Metabolic demands, active neurovascular coupling, correct glymphatic process, and adequate oxidative and inflammatory responses could be bulwarks in defense of the correct aging process; their impairments lead to a potentially catastrophic and non-reversible condition.
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Affiliation(s)
- Rita Moretti
- Neurology Clinic, Department of Medical, Surgical and Health Sciences, University of Trieste, 34149 Trieste, Italy;
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143
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Ghasemi E, Afkhami Aghda F, Rezvani ME, Shahrokhi Raeini A, Hafizibarjin Z, Zare Mehrjerdi F. Effect of endogenous sulfur dioxide on spatial learning and memory and hippocampal damages in the experimental model of chronic cerebral hypoperfusion. J Basic Clin Physiol Pharmacol 2020; 31:/j/jbcpp.ahead-of-print/jbcpp-2019-0227/jbcpp-2019-0227.xml. [PMID: 32004146 DOI: 10.1515/jbcpp-2019-0227] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 11/15/2019] [Indexed: 12/27/2022]
Abstract
Background The vascular changes due to cerebrovascular damage, especially on the capillaries, play a vital role in causing vascular dementia. Increasing oxidative stress can lead to tissue damage while reducing brain blood flow. The use of factors reducing the oxidative stress level can decrease the brain damages. Sulfur dioxide (SO2) is one of the most important air pollutants that lead to the development of severe brain damage in large quantities. However, studies have recently confirmed the protective effect of SO2 in cardiac ischemic injury, atherosclerosis and pulmonary infections. Methods The permanent bilateral common carotid artery occlusion (BCAO) method was used to induce chronic cerebral hypoperfusion (CCH). Two treatment groups of SO2 were studied. The animal cognitive performance was evaluated using the Morris water maze. Hippocampal tissue damage was examined after 2 months of BCAO. In the biochemical analysis, the activity of catalase and lipid peroxidation of the hippocampus was studied. Results Neuronal damage in hippocampus, as well as cognitive impairment in ischemia groups treated with SO2 showed a significant improvement. Catalase activity was also significantly increased in the hippocampus of treated groups. Conclusions According to the results, SO2 is likely to be effective in reducing the CCH-caused damages by increasing the antioxidant capacity of the hippocampus.
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Affiliation(s)
- Elaheh Ghasemi
- International Campus, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Faezeh Afkhami Aghda
- Neurobiomedical Research Center, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
| | - Mohammad Ebrahim Rezvani
- Neurobiomedical Research Center, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
| | - Azadeh Shahrokhi Raeini
- Neurobiomedical Research Center, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
| | - Zeynab Hafizibarjin
- Neurobiomedical Research Center, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
| | - Fatemeh Zare Mehrjerdi
- Department of Physiology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran, Phone: +98-35-38203412, Fax: +98-35-38203412
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144
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Livingston JM, McDonald MW, Gagnon T, Jeffers MS, Gomez-Smith M, Antonescu S, Cron GO, Boisvert C, Lacoste B, Corbett D. Influence of metabolic syndrome on cerebral perfusion and cognition. Neurobiol Dis 2020; 137:104756. [PMID: 31978604 DOI: 10.1016/j.nbd.2020.104756] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 12/19/2019] [Accepted: 01/20/2020] [Indexed: 02/06/2023] Open
Abstract
Vascular cognitive impairment (VCI) is associated with chronic cerebral hypoperfusion (CCH) and memory deficits, and often occurs concurrently with metabolic syndrome (MetS). Despite their common occurrence, it is unknown whether CCH and MetS act synergistically to exacerbate VCI-associated pathology. Here, using male Sprague-Dawley rats, we examined the effects of a clinically relevant model of adolescent-onset MetS and adult-onset CCH on neuro-vascular outcomes, combining a cafeteria diet with a 2-vessel occlusion (2VO) model. Using longitudinal imaging, histology, and behavioural assessments, we identified several features of MetS and CCH including reduced cerebral blood volume, white matter atrophy, alterations in hippocampal cell density, and memory impairment. Furthermore, we identified a number of significant associations, potentially predictive of MetS and pathophysiological outcomes. White matter volume was positively correlated to HDL cholesterol; hippocampal cell density was negatively correlated to fasted blood glucose; cerebral blood flow and volume was negatively predicted by the combination of 2VO surgery and increased fasted blood glucose. These results emphasize the importance of including comorbid conditions when modeling VCI, and they outline a highly translational preclinical model that could be used to investigate potential interventions to mitigate VCI-associated pathology and cognitive decline.
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Affiliation(s)
- Jessica M Livingston
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Matthew W McDonald
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada; Canadian Partnership for Stroke Recovery, Ottawa, ON, Canada
| | - Therese Gagnon
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Matthew S Jeffers
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada; Canadian Partnership for Stroke Recovery, Ottawa, ON, Canada
| | - Mariana Gomez-Smith
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Sabina Antonescu
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Greg O Cron
- Ottawa Hospital Research Institute, Neuroscience Program, Ottawa, ON, Canada; Department of Medical Imaging, The Ottawa Hospital, Ottawa, ON, Canada; Department of Radiology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Carlie Boisvert
- Ottawa Hospital Research Institute, Neuroscience Program, Ottawa, ON, Canada
| | - Baptiste Lacoste
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada; Canadian Partnership for Stroke Recovery, Ottawa, ON, Canada; Ottawa Hospital Research Institute, Neuroscience Program, Ottawa, ON, Canada; University of Ottawa Brain and Mind Research Institute, Ottawa, ON, Canada
| | - Dale Corbett
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada; Canadian Partnership for Stroke Recovery, Ottawa, ON, Canada; University of Ottawa Brain and Mind Research Institute, Ottawa, ON, Canada.
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145
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Ciacciarelli A, Sette G, Giubilei F, Orzi F. Chronic cerebral hypoperfusion: An undefined, relevant entity. J Clin Neurosci 2020; 73:8-12. [PMID: 31948882 DOI: 10.1016/j.jocn.2020.01.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/06/2020] [Indexed: 01/11/2023]
Abstract
Despite the large body of data available, chronic cerebral hypoperfusion lacks an operative definition. In a tautological way, the term hypoperfusion is being referred to conditions of "inadequate blood flow", "defects of perfusion" or "dysfunction of autoregulation". The chronicity refers to sustained conditions or wavering states characterized by repeated phases of inefficient functional hyperemia. The phenomenon may affect the whole brain or defined areas. A few defined clinical disorders, including heart failure, hypotension, atherosclerosis of large or small vessels and carotid stenosis are thought to cause progressive brain disorders due to chronic hypoperfusion. The clinical relevance manifests mostly as neurocognitive disorders associated with neuroimaging changes.The available data support a conceptual framework that considerschronic cerebral hypoperfusiona likely, relevant pathogenic mechanism for the neurodegeneration-like progression of the neurocognitive disorders. The relationship between neuropathology, cerebral perfusion, and symptoms progression is, however, elusive for several aspects. Typical microangiopathy findings, such as MRI white matter hyperintensities, may appear in individuals without any cerebrovascular risk or vascular lesions. Pathology features of the MRI changes, such as demyelination and gliosis, may result from dysfunction of the neuro-vascular unit not directly associated withvascular mechanisms. In this review, we aim to overview the most common clinical conditions thought to reflect chronic hypoperfusion.
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Affiliation(s)
- Antonio Ciacciarelli
- Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), "SAPIENZA" University of Rome, Sant'Andrea University Hospital, Rome, Italy.
| | - Giuliano Sette
- Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), "SAPIENZA" University of Rome, Sant'Andrea University Hospital, Rome, Italy
| | - Franco Giubilei
- Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), "SAPIENZA" University of Rome, Sant'Andrea University Hospital, Rome, Italy
| | - Francesco Orzi
- Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), "SAPIENZA" University of Rome, Sant'Andrea University Hospital, Rome, Italy
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Tzameret A, Piontkewitz Y, Nitzan A, Rudoler N, Bruzel M, Zilberstein Y, Ziv H, Pri‐Chen S, Solomon AS. Mild carotid stenosis creates gradual, progressive, lifelong brain, and eye damage: An experimental laboratory rat model. J Comp Neurol 2020; 528:1672-1682. [DOI: 10.1002/cne.24851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 12/19/2019] [Accepted: 12/19/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Adi Tzameret
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Yael Piontkewitz
- Straus Center for Computational NeuroimagingTel Aviv University Tel Aviv Israel
| | - Anat Nitzan
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Nir Rudoler
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Marina Bruzel
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Yael Zilberstein
- The Sackler Cellular and Molecular Imaging Center, Sackler Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Hana Ziv
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Sarah Pri‐Chen
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
| | - Arieh S. Solomon
- Goldschleger Eye Research Institute, Faculty of MedicineTel Aviv University Tel Aviv Israel
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147
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Solis E, Hascup KN, Hascup ER. Alzheimer's Disease: The Link Between Amyloid-β and Neurovascular Dysfunction. J Alzheimers Dis 2020; 76:1179-1198. [PMID: 32597813 PMCID: PMC7483596 DOI: 10.3233/jad-200473] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
While prevailing evidence supports that the amyloid cascade hypothesis is a key component of Alzheimer's disease (AD) pathology, many recent studies indicate that the vascular system is also a major contributor to disease progression. Vascular dysfunction and reduced cerebral blood flow (CBF) occur prior to the accumulation and aggregation of amyloid-β (Aβ) plaques and hyperphosphorylated tau tangles. Although research has predominantly focused on the cellular processes involved with Aβ-mediated neurodegeneration, effects of Aβ on CBF and neurovascular coupling are becoming more evident. This review will describe AD vascular disturbances as they relate to Aβ, including chronic cerebral hypoperfusion, hypertension, altered neurovascular coupling, and deterioration of the blood-brain barrier. In addition, we will describe recent findings about the relationship between these vascular defects and Aβ accumulation with emphasis on in vivo studies utilizing rodent AD models.
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Affiliation(s)
- Ernesto Solis
- Department of Neurology, Neuroscience Institute, Center for Alzheimer’s Disease and Related Disorders, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Kevin N. Hascup
- Department of Neurology, Neuroscience Institute, Center for Alzheimer’s Disease and Related Disorders, Southern Illinois University School of Medicine, Springfield, IL, USA
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Erin R. Hascup
- Department of Neurology, Neuroscience Institute, Center for Alzheimer’s Disease and Related Disorders, Southern Illinois University School of Medicine, Springfield, IL, USA
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA
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148
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Zhang LY, Pan J, Mamtilahun M, Zhu Y, Wang L, Venkatesh A, Shi R, Tu X, Jin K, Wang Y, Zhang Z, Yang GY. Microglia exacerbate white matter injury via complement C3/C3aR pathway after hypoperfusion. Theranostics 2020; 10:74-90. [PMID: 31903107 PMCID: PMC6929610 DOI: 10.7150/thno.35841] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 09/08/2019] [Indexed: 12/22/2022] Open
Abstract
Microglial activation participates in white matter injury after cerebral hypoperfusion. However, the underlying mechanism is unclear. Here, we explore whether activated microglia aggravate white matter injury via complement C3-C3aR pathway after chronic cerebral hypoperfusion. Methods: Adult male Sprague-Dawley rats (n = 80) underwent bilateral common carotid artery occlusion for 7, 14, and 28 days. Cerebral vessel density and blood flow were examined by synchrotron radiation angiography and three-dimensional arterial spin labeling. Neurobehavioral assessments, CLARITY imaging, and immunohistochemistry were performed to evaluate activation of microglia and C3-C3aR pathway. Furthermore, C3aR knockout mice were used to establish the causal relationship of C3-C3aR signaling on microglia activation and white matter injury after hypoperfusion. Results: Cerebral vessel density and blood flow were reduced after hypoperfusion (p<0.05). Spatial learning and memory deficits and white matter injury were shown (p<0.05). These impairments were correlated with aberrant microglia activation and an increase in the number of reactive microglia adhering to and phagocytosed myelin in the hypoperfusion group (p<0.05), which were accompanied by the up-regulation of complement C3 and its receptors C3aR (p<0.05). Genetic deletion of C3ar1 significantly inhibited aberrant microglial activation and reversed white matter injury after hypoperfusion (p<0.05). Furthermore, the C3aR antagonist SB290157 decreased the number of microglia adhering to myelin (p<0.05), attenuated white matter injury and cognitive deficits in chronic hypoperfusion rats (p<0.05). Conclusions: Our results demonstrated that aberrant activated microglia aggravate white matter injury via C3-C3aR pathway during chronic hypoperfusion. These findings indicate C3aR plays a critical role in mediating neuroinflammation and white matter injury through aberrant microglia activation, which provides a novel therapeutic target for the small vessel disease and vascular dementia.
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149
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Progesterone Protects Prefrontal Cortex in Rat Model of Permanent Bilateral Common Carotid Occlusion via Progesterone Receptors and Akt/Erk/eNOS. Cell Mol Neurobiol 2019; 40:829-843. [PMID: 31865501 DOI: 10.1007/s10571-019-00777-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 12/10/2019] [Indexed: 01/07/2023]
Abstract
Sustained activation of pro-apoptotic signaling due to a sudden and prolonged disturbance of cerebral blood circulation governs the neurodegenerative processes in prefrontal cortex (PFC) of rats whose common carotid arteries are permanently occluded. The adequate neuroprotective therapy should minimize the activation of toxicity pathways and increase the activity of endogenous protective mechanisms. Several neuroprotectants have been proposed, including progesterone (P4). However, the underlying mechanism of its action in PFC following permanent bilateral occlusion of common carotid arteries is not completely investigated. We, thus herein, tested the impact of post-ischemic P4 treatment (1.7 mg/kg for seven consecutive days) on previously reported aberrant neuronal morphology and amount of DNA fragmentation, as well as the expression of progesterone receptors along with the key elements of Akt/Erk/eNOS signal transduction pathway (Bax, Bcl-2, cytochrome C, caspase 3, PARP, and the level of nitric oxide). The obtained results indicate that potential amelioration of histological changes in PFC might be associated with the absence of activation of Bax/caspase 3 signaling cascade and the decline of DNA fragmentation. The study also provides the evidence that P4 treatment in repeated regiment of administration might be effective in neuronal protection against ischemic insult due to re-establishment of the compromised action of Akt/Erk/eNOS-mediated signaling pathway and the upregulation of progesterone receptors.
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150
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Yu Y, Luo X, Li C, Ding F, Wang M, Xie M, Yu Z, Ransom BR, Wang W. Microglial Hv1 proton channels promote white matter injuries after chronic hypoperfusion in mice. J Neurochem 2019; 152:350-367. [PMID: 31769505 DOI: 10.1111/jnc.14925] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 11/16/2019] [Accepted: 11/19/2019] [Indexed: 12/30/2022]
Abstract
Microglia are critical in damage/repair processes during ischemic white matter injury (WMI). Voltage-gated proton channel (Hv1) is expressed in microglia and contributes to nicotinamide adenine dinucleotide phosphate oxidase complex-dependent production of reactive oxygen species (ROS). Recent findings have shown that Hv1 is involved in regulating luminal pH of M1-polarized microglial phagosomes and inhibits endocytosis in microglia. We previously reported that Hv1 facilitated production of ROS and pro-inflammatory cytokines in microglia and enhanced damage to oligodendrocyte progenitor cells from oxygen and glucose deprivation. To investigate the role of Hv1 in hypoperfusion-induced WMI, we employed mice that were genetically devoid of Hv1 (Hv1-/- ), as well as a model of subcortical vascular dementia via bilateral common carotid artery stenosis. Integrity of myelin was assessed using immunofluorescent staining and transmission electron microscopy, while cognitive impairment was assessed using an eight-arm radial maze test. Hv1 deficiency was found to attenuate bilateral common carotid artery stenosis-induced disruption of white matter integrity and impairment of working memory. Immunofluorescent staining and western blotting were used to assay changes in oligodendrocytes, OPCs, and microglial polarization. Compared with that in wild-type (WT) mice, Hv1-/- mice exhibited reduced ROS generation, decreased pro-inflammatory cytokines production, and an M2-dominant rather than M1-dominant microglial polarization. Furthermore, Hv1-/- mice exhibited enhanced OPC proliferation and differentiation into oligodendrocytes. Results of mouse-derived microglia-OPC co-cultures suggested that PI3K/Akt signaling was involved in Hv1-deficiency-induced M2-type microglial polarization and concomitant OPC differentiation. These results suggest that microglial Hv1 is a promising therapeutic target for reducing ischemic WMI and cognitive impairment.
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Affiliation(s)
- Ying Yu
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiang Luo
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chunyu Li
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fengfei Ding
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Minghuan Wang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Minjie Xie
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhiyuan Yu
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bruce R Ransom
- Department of Neurology, University of Washington School of Medicine HMC, Seattle, WA, USA
| | - Wei Wang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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