Risk factor convergence in the development of lacunar strokes and vascular cognitive impairment and dementia

腔隙性中风、血管性认知障碍和痴呆发生的危险因素趋同

• 批准号: 10043409
• 负责人: JAVIER CUEVAS
• 金额: $ 41.11万
• 依托单位: UNIVERSITY OF SOUTH FLORIDA
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10043409
• 关键词: Acceleration; Adhesives; Affect; Aging; Alzheimer' s Disease; Animal Feed; Animal Model; Behavioral; Blood - brain barrier anatomy; Cerebral small vessel disease; Cerebrum; Cessation of life; Data; Dementia; Dependence; Deposition; Development; Diabetes Mellitus; Diet; Dose; Elderly; Etiology; Evolution; Excision; Fructose; Gliosis; Histologic; Human; Hyperhomocysteinemia; Hypertension; Imaging Techniques; Immunohistochemistry; Impaired cognition; Inbred SHR Rats; Individual; Infarction; Injections; Injury; Insulin; Insulin Resistance; Investigation; Knowledge; Lacunar Infarctions; Lead; Learning; Life; Measures; Memory; Metabolic; Microvascular Dysfunction; Mission; Modeling; Nature; Neurons; Oligodendroglia; Outcome; Pathology; Perfusion; Phenotype; Preclinical Testing; Public Health; Radial; Rattus; Research; Risk Factors; Sensory; Severities; Spatial Distribution; Streptozocin; Stress; Stroke; Structure; Structure of beta Cell of islet; Testing; Therapeutic; Time; United States National Institutes of Health; Vascular Diseases; Vascular remodeling; Visualization; abeta deposition; aged; animal imaging; arm; behavior test; behavioral outcome; behavioral study; clinically relevant; dementia risk; deoxyhemoglobin; design; diabetic; disability; experimental study; field study; gait examination; hemodynamics; high risk; human disease; imaging modality; innovation; motor deficit; non-invasive imaging; novel; optoacoustic tomography; physically handicapped; prevent; therapeutic evaluation; vascular cognitive impairment and dementia; vascular injury; water maze

Vascular cognitive impairment and dementia (VCID) is the second most common form of dementia after Alzheimer’s Disease (AD). VCID is one of the consequences of cerebral small-vessel disease (SVD). This vascular disorder produces cerebral perfusion deficits and, ultimately, cortical and/or subcortical lacunar strokes. Lacunar strokes can be ischemic or microhemorrhagic in nature and can result in long-term physical disabilities and death. Critical to the current proposal, lacunar strokes are a leading cause of VCID. Hypertension, hyperhomocysteinemia, diabetes and advanced age are independent, major risk factors for SVD and the resulting lacunar strokes. These factors are often clustered in individuals with both the highest risk for lacunar strokes and the worst outcomes. The current proposal is driven by the central hypothesis that combining major human risk factors for SVD in an animal model produces a synergistic effect that recapitulates the human disease etiology, giving rise to vascular injury that results in lacunar stokes and ultimately VCID. It is further hypothesized that combining these risk factors facilitates the coalescence of lacunar strokes and that the resulting augmentation of injury hastens behavioral deficits. In this study, will use the diet-induced hyperhomocysteinemia model of SVD in aged spontaneously hypertensive rats (SHR), which also produces an insulin-resistant phenotype. In addition, we will further drive the diabetic phenotype with 1) a high-fructose diet and 2) promoting a reduction in pancreatic beta cells through the use of the low-dose streptozocin. The superimposition of diabetes will further test our hypothesis that by combining a greater number of independent risk factors the progression of SVDlacunar infarcts VCID is accelerated and exacerbated. Our study will also leverage the use a novel, non-invasive imaging modality, multispectral optoacoustic tomography (MSOT), to identify and measure regions of perfusion/oxygenation deficits and correlate these with behavioral outcomes longitudinally and with final histological analysis of structural injury. Successful completion of this proposal will demonstrate that the combination of these risk factors recapitulates human sequelae of SVDlacunar infarctsVCID in an animal model. Ultimately, the development of this robust and highly relevant lacunar stroke/VCID animal model and imaging technique will permit pre-clinical testing of targets and lead compounds for lacunar stroke and VCID therapeutics. We plan to test our central hypothesis and accomplish our overall objective by pursuing the following Specific Aims: 1) Aim 1: Determine the synergistic effect of hypertension, diet-induced hyperhomocysteinemia, and aging on small-vessel disease, lacunar strokes and VCID in rats, and 2) Determine the impact of insulin-resistance and diabetes on lacunar strokes and VCID in a rat model of hypertension- hyperhomocysteinemia-aging. The proposed research is innovative because it represents a substantial departure from the status quo by shifting focus onto the investigation of how combining multiple human lacunar stroke and VCID risk factors that 1) promote vascular remodeling and 2) physically stress the microvasculature can recapitulate the human condition and result in acceleration and exacerbation of injury in an animal model.

血管性认知障碍和痴呆（VCID）是仅次于老年痴呆症的第二常见形式