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Chronic cerebral hypoperfusion

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https://www.readbyqxmd.com/read/28399892/effects-of-environmental-enrichment-on-white-matter-glial-responses-in-a-mouse-model-of-chronic-cerebral-hypoperfusion
#1
Yoshiki Hase, Lucinda Craggs, Mai Hase, William Stevenson, Janet Slade, Dianne Lopez, Rubin Mehta, Aiqing Chen, Di Liang, Arthur Oakley, Masafumi Ihara, Karen Horsburgh, Raj N Kalaria
BACKGROUND: This study was designed to explore the beneficial effects of environmental enrichment (EE) on white matter glial changes in a mouse model of chronic cerebral hypoperfusion induced by bilateral common carotid artery stenosis (BCAS). METHODS: A total of 74 wild-type male C57BL/6J mice underwent BCAS or sham surgery. One week after surgery, the mice were randomly assigned into three different groups having varied amounts of EE-standard housing with no EE conditions (std), limited exposure with 3 h EE a day (3 h) and full-time exposure to EE (full) for 12 weeks...
April 11, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28365975/neuroprotective-effect-of-duloxetine-on-chronic-cerebral-hypoperfusion-induced-hippocampal-neuronal-damage
#2
Jin-A Park, Choong-Hyun Lee
Chronic cerebral hypoperfusion (CCH), which is associated with onset of vascular dementia, causes cognitive impairment and neuropathological alterations in the brain. In the present study, we examined the neuroprotective effect of duloxetine (DXT), a potent and balanced serotonin/norepinephrine reuptake inhibitor, on CCH-induced neuronal damage in the hippocampal CA1 region using a rat model of permanent bilateral common carotid arteries occlusion. We found that treatment with 20 mg/kg DXT could attenuate the neuronal damage, the reduction of phosphorylations of mTOR and p70S6K as well as the elevations of TNF-α and IL- 1β levels in the hippocampal CA1 region at 28 days following CCH...
April 6, 2017: Biomolecules & Therapeutics
https://www.readbyqxmd.com/read/28357141/intrahemispheric-perfusion-in-chronic-stroke-induced-aphasia
#3
Cynthia K Thompson, Matthew Walenski, YuFen Chen, David Caplan, Swathi Kiran, Brenda Rapp, Kristin Grunewald, Mia Nunez, Richard Zinbarg, Todd B Parrish
Stroke-induced alterations in cerebral blood flow (perfusion) may contribute to functional language impairments and recovery in chronic aphasia. Using MRI, we examined perfusion in the right and left hemispheres of 35 aphasic and 16 healthy control participants. Across 76 regions (38 per hemisphere), no significant between-subjects differences were found in the left, whereas blood flow in the right was increased in the aphasic compared to the control participants. Region-of-interest (ROI) analyses showed a varied pattern of hypo- and hyperperfused regions across hemispheres in the aphasic participants; however, there were no significant correlations between perfusion values and language abilities in these regions...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28351960/pathogenesis-of-white-matter-changes-in-cerebral-small-vessel-diseases-beyond-vessel-intrinsic-mechanisms
#4
REVIEW
Anne Joutel, Hugues Chabriat
Cerebral small vessel diseases (SVDs) are a leading cause of age and hypertension-related stroke and dementia. The salient features of SVDs visible on conventional brain magnetic resonance images include white matter hyperintensities (WMHs) on T2-weighted images, small infarcts, macrohemorrhages, dilated perivascular spaces, microbleeds and brain atrophy. Among these, WMHs are the most common and often the earliest brain tissue changes. Moreover, over the past two decades, large population- and patient-based studies have established the clinical importance of WMHs, notably with respect to cognitive and motor disturbances...
April 25, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28351846/postural-heart-rate-changes-in-young-patients-with-vasovagal-syncope
#5
Marvin S Medow, Sana Merchant, Melissa Suggs, Courtney Terilli, Breige O'Donnell-Smith, Julian M Stewart
BACKGROUND AND OBJECTIVES: Recurrent postural vasovagal syncope (VVS) is caused by transient cerebral hypoperfusion from episodic hypotension and bradycardia; diagnosis is made by medical history. VVS contrasts with postural tachycardia syndrome (POTS), defined by chronic daily symptoms of orthostatic intolerance with excessive upright tachycardia without hypotension. POTS has recently been conflated with VVS when excessive tachycardia is succeeded by hypotension during tilt testing. We hypothesize that excessive tachycardia preceding hypotension and bradycardia is part of the vasovagal response during tilt testing of patients with VVS...
March 28, 2017: Pediatrics
https://www.readbyqxmd.com/read/28342896/neuroprotective-and-axonal-outgrowth-promoting-effects-of-tetramethylpyrazine-nitrone-in-chronic-cerebral-hypoperfusion-rats-and-primary-hippocampal-neurons-exposed-to-hypoxia
#6
Tao Zhang, Jianbo Gu, Liangmiao Wu, Ning Li, Yewei Sun, Pei Yu, Yuqiang Wang, Gaoxiao Zhang, Zaijun Zhang
Chronic cerebral hypoperfusion is an important risk factor for vascular dementia and other brain dysfunctions, for which there are currently no effective medications available. We investigated the neuroprotective and axonal outgrowth promoting effects of tetramethylpyrazine nitrone (TBN) in a permanent bilateral occlusion of the common carotid arteries (2VO) rat model and in primary hippocampal neurons exposed to oxygen glucose deprivation (OGD). At 6th week after 2VO, TBN increased the time spent in novel arms in the Y-maze test and improved the discrimination ratio in object reorganization task...
March 22, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28323841/detection-of-crossed-cerebellar-diaschisis-in-hyperacute-ischemic-stroke-using-arterial-spin-labeled-mr-imaging
#7
Koung Mi Kang, Chul-Ho Sohn, Seung Hong Choi, Keun-Hwa Jung, Roh-Eul Yoo, Tae Jin Yun, Ji-Hoon Kim, Sun-Won Park
BACKGROUND AND PURPOSE: Arterial spin-labeling (ASL) was recently introduced as a noninvasive method to evaluate cerebral hemodynamics. The purposes of this study were to assess the ability of ASL imaging to detect crossed cerebellar diaschisis (CCD) in patients with their first unilateral supratentorial hyperacute stroke and to identify imaging or clinical factors significantly associated with CCD. MATERIALS AND METHODS: We reviewed 204 consecutive patients who underwent MRI less than 8 hours after the onset of stroke symptoms...
2017: PloS One
https://www.readbyqxmd.com/read/28316570/isometric-exercise-training-for-managing-vascular-risk-factors-in-mild-cognitive-impairment-and-alzheimer-s-disease
#8
REVIEW
Nicole C L Hess, Neil A Smart
Alzheimer's disease (AD) is the most common form of dementia diagnosed amongst the elderly. Mild cognitive impairment (MCI) is a condition often indicative of the earliest symptomatology of AD with 10%-15% of MCI patients reportedly progressing to a diagnosis of AD. Individuals with a history of vascular risk factors (VRF's) are considered high risk candidates for developing cognitive impairment in later life. Evidence suggests that vascular injury resulting from untreated VRF's promotes progression from MCI to AD and exacerbates the severity of dementia in AD, and neuroimaging studies have found that the neurodegenerative processes associated with AD are heavily driven by VRF's that promote cerebral hypoperfusion...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28289715/cerebrovascular-adaptations-to-cocaine-induced-transient-ischemic-attacks-in-the-rodent-brain
#9
Jiang You, Nora D Volkow, Kicheon Park, Qiujia Zhang, Kevin Clare, Congwu Du, Yingtian Pan
Occurrence of transient ischemic attacks (TIA) and cerebral strokes is a recognized risk associated with cocaine abuse. Here, we use a rodent model along with optical imaging to study cocaine-induced TIA and the associated dynamic changes in cerebral blood flow velocity (CBFv) and cerebrovasculature. We show that chronic cocaine exposure in mice resulted in marked cortical hypoperfusion, in significant arterial and venous vasoconstriction, and in a sensitized vascular response to an acute cocaine injection...
March 9, 2017: JCI Insight
https://www.readbyqxmd.com/read/28285825/corrigendum-to-the-ameliorative-effects-of-exercise-on-cognitive-impairment-and-white-matter-injury-from-blood-brain-barrier-disruption-induced-by-chronic-cerebral-hypoperfusion-in-adolescent-rats-neurosci-lett-638-2017-83-89
#10
Jae-Min Lee, Jong-Min Park, Min Kyung Song, Yoo Joung Oh, Chang-Ju Kim, Youn-Jung Kim
No abstract text is available yet for this article.
March 9, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28273833/protective-effects-of-ferulic-acid-against-chronic-cerebral-hypoperfusion-induced-swallowing-dysfunction-in-rats
#11
Takashi Asano, Hirokazu Matsuzaki, Naohiro Iwata, Meiyan Xuan, Shinya Kamiuchi, Yasuhide Hibino, Takeshi Sakamoto, Mari Okazaki
Ferulic acid (FA), a phenolic phytochemical, has been reported to exert antioxidative and neuroprotective effects. In this study, we investigated the protective effects of FA against the dysfunction of the swallowing reflex induced by ligation of bilateral common carotid arteries (2VO) in rats. In 2VO rats, topical administration of water or citric acid to the pharyngolaryngeal region evoked a diminished number of swallowing events with prolonged latency compared to sham-operated control rats. 2VO rats had an increased level of superoxide anion radical, and decreased dopamine and tyrosine hydroxylase enzyme levels in the striatum, suggesting that 2VO augmented cerebral oxidative stress and impaired the striatal dopaminergic system...
March 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28273725/the-effects-of-environmental-enrichment-on-white-matter-pathology-in-a-mouse-model-of-chronic-cerebral-hypoperfusion
#12
Yoshiki Hase, Lucinda Craggs, Mai Hase, William Stevenson, Janet Slade, Aiqing Chen, Di Liang, Abdel Ennaceur, Arthur Oakley, Masafumi Ihara, Karen Horsburgh, Raj N Kalaria
White matter (WM) disintegration is common in the older population and is associated with vascular cognitive impairment (VCI). This study explored the effects of environmental enrichment (EE) on pathological sequelae in a mouse model of chronic cerebral hypoperfusion induced by bilateral common carotid artery stenosis (BCAS). Male C57BL/6 J mice underwent BCAS or sham surgery. One-week after surgery, mice were exposed to three different degrees of EE; either standard housing conditions (std), limited 3 h exposure to EE per day (3 h) or full-time exposure to EE (full) for 12 weeks...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28265034/extracellular-matrix-inflammation-in-vascular-cognitive-impairment-and-dementia
#13
REVIEW
Gary A Rosenberg
Vascular cognitive impairment and dementia (VCID) include a wide spectrum of chronic manifestations of vascular disease related to large vessel strokes and small vessel disease (SVD). Lacunar strokes and white matter (WM) injury are consequences of SVD. The main vascular risk factor for SVD is brain hypoperfusion from cerebral blood vessel narrowing due to chronic hypertension. The hypoperfusion leads to activation and degeneration of astrocytes with the resulting fibrosis of the extracellular matrix (ECM)...
March 1, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28219828/treating-cognitive-impairment-with-transcranial-low-level-laser-therapy
#14
REVIEW
Jack C de la Torre
This report examines the potential of low level laser therapy (LLLT) to alter brain cell function and neurometabolic pathways using red or near infrared (NIR) wavelengths transcranially for the prevention and treatment of cognitive impairment. Although laser therapy on human tissue has been used for a number of medical conditions since the late 1960s, it is only recently that several clinical studies have shown its value in raising neurometabolic energy levels that can improve cerebral hemodynamics and cognitive abilities in humans...
March 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28205591/protective-effect-of-17%C3%AE-estradiol-upon-hippocampal-spine-density-and-cognitive-function-in-an-animal-model-of-vascular-dementia
#15
Ying Zhu, Quanguang Zhang, Wenli Zhang, Ning Li, Yongxin Dai, Jingyi Tu, Fang Yang, Darrell W Brann, Ruimin Wang
The current study examined whether the steroid hormone, 17β-estradiol (E2) can exert long-lasting beneficial effects upon axonal health, synaptic plasticity, dementia-related amyloid-beta (Aβ) protein expression, and hippocampal-dependent cognitive function in an animal model of chronic cerebral hypoperfusion and vascular dementia (VaD). Chronic cerebral hypoperfusion and VaD was induced by bilateral common carotid artery occlusion (BCCAO) in adult male Sprague Dawley rats. Low dose E2 administered for the first 3-months after BCCAO exerted long-lasting beneficial effects, including significant neuroprotection of hippocampal CA1 neurons and preservation of hippocampal-dependent cognitive function when examined at 6-months after BCCAO...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28178896/sequential-pet-estimation-of-cerebral-oxygen-metabolism-with-spontaneous-respiration-of-15-o-gas-in-mice-with-bilateral-common-carotid-artery-stenosis
#16
Takashi Temma, Makoto Yamazaki, Jun Miyanohara, Hisashi Shirakawa, Naoya Kondo, Kazuhiro Koshino, Shuji Kaneko, Hidehiro Iida
Positron emission tomography with (15)O-labeled gases ((15)O-PET) is important for in vivo measurement of cerebral oxygen metabolism both in clinical and basic settings. However, there are currently no reports concerning (15)O-PET in mice. Here, we developed an (15)O-PET method applicable to mice with spontaneous respiration of (15)O-gas without a tracheotomy catheter. Sequential (15)O-PET was also performed in a mouse model of chronic cerebral hypoperfusion with bilateral common carotid artery stenosis (BCAS) induced by placement of microcoils...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28176277/erratum-to-the-role-of-autophagy-in-the-correlation-between-neuron-damage-and-cognitive-impairment-in-rat-chronic-cerebral-hypoperfusion
#17
Wenying Zou, Yufei Song, Yumei Li, Yu Du, Xiaojie Zhang, Jianliang Fu
No abstract text is available yet for this article.
February 8, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28106731/hypoxia-inducible-factor-1%C3%AE-promotes-endogenous-adaptive-response-in-rat-model-of-chronic-cerebral-hypoperfusion
#18
Ying Yang, Jieyang Ju, Min Deng, Jing Wang, Hui Liu, Li Xiong, Junjian Zhang
Hypoxia inducible factor 1α (HIF-1α), a pivotal regulator of gene expression in response to hypoxia and ischemia, is now considered to regulate both pro-survival and pro-death responses depending on the duration and severity of the stress. We previously showed that chronic global cerebral hypoperfusion (CCH) triggered long-lasting accumulation of HIF-1α protein in the hippocampus of rats. However, the role of the stabilized HIF-1α in CCH is obscure. Here, we knock down endogenous HIF-1α to determine whether and how HIF-1α affects the disease processes and phenotypes of CCH...
January 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28070001/neuroimaging-biomarkers-predict-brain-structural-connectivity-change-in-a-mouse-model-of-vascular-cognitive-impairment
#19
Philipp Boehm-Sturm, Martina Füchtemeier, Marco Foddis, Susanne Mueller, Rebecca C Trueman, Marietta Zille, Jan Leo Rinnenthal, Theodore Kypraios, Laurence Shaw, Ulrich Dirnagl, Tracy D Farr
BACKGROUND AND PURPOSE: Chronic hypoperfusion in the mouse brain has been suggested to mimic aspects of vascular cognitive impairment, such as white matter damage. Although this model has attracted attention, our group has struggled to generate a reliable cognitive and pathological phenotype. This study aimed to identify neuroimaging biomarkers of brain pathology in aged, more severely hypoperfused mice. METHODS: We used magnetic resonance imaging to characterize brain degeneration in mice hypoperfused by refining the surgical procedure to use the smallest reported diameter microcoils (160 μm)...
February 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28058581/the-role-of-autophagy-in-the-correlation-between-neuron-damage-and-cognitive-impairment-in-rat-chronic-cerebral-hypoperfusion
#20
Wenying Zou, Yufei Song, Yumei Li, Yu Du, Xiaojie Zhang, Jianliang Fu
Pathological changes and cognitive impairment caused by chronic cerebral hypoperfusion (CCH) have been previously reported. However, how these changes progress remains unclear. Additionally, there are few studies regarding the mechanism underlying the involvement of autophagy in these processes. Two-step bilateral common carotid artery occlusion (BCCAO) was performed to replicate CCH in Sprague Dawley rats. The animals were divided into seven groups, including a sham group and 2-, 4-, 8-, 12-, 16-, and 20-week BCCAO groups (n = 7 per group)...
January 5, 2017: Molecular Neurobiology
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