Mechanistic role of vascular dysfunction in TBI-mediated cognitive dysfunction

血管功能障碍在 TBI 介导的认知功能障碍中的机制作用

• 批准号: 10610367
• 负责人: JONATHAN LIFSHITZ
• 金额: --
• 依托单位: PHOENIX VA HEALTH CARE SYSTEM
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10610367
• 关键词: Acute; Aerobic Exercise; Affect; Afghanistan; Aging; Alzheimer' s Disease; Alzheimer' s disease related dementia; Animals; Attenuated; Blood Vessels; Brain; Brain-Derived Neurotrophic Factor; Carbon Dioxide; Cardiac; Cardiovascular system; Cerebrovascular Disorders; Cerebrum; Chronic; Coronary artery; Data; Dementia; Development; Diffuse; Disease; Echocardiography; Endothelium; Exposure to; Genetic Predisposition to Disease; Goals; Histopathology; Homeostasis; Hypertension; Impaired cognition; Impairment; Inbred SHR Rats; Injury; Iraq; Knowledge; Link; Magnetic Resonance Imaging; Measures; Mediating; Modeling; Molecular; Morbidity - disease rate; Neurons; Organ; Outcome; Outcome Measure; Pathologic; Pathway interactions; Perfusion; Physiological; Rattus; Regulation; Reporting; Rest; Role; Soldier; Sprague-Dawley Rats; Structure; Testing; Traumatic Brain Injury; Vascular Dementia; Vascular Diseases; Vascular blood supply; Veterans; Work; Youth; base; cardiovascular effects; cardiovascular risk factor; cerebral artery; cerebrovascular; chronic traumatic encephalopathy; cognitive function; disorder risk; early onset; exercise training; fluid percussion injury; hypertensive; improved; in vivo; insight; mild traumatic brain injury; military veteran; mortality; neurovascular; neurovascular coupling; normotensive; novel; object recognition; persistent symptom; pressure; prevent; rehabilitation strategy; response; service member; sham surgery; stressor; synergism

Abstract Mild traumatic brain injury (mTBI) is a major cause of mortality and morbidity especially among service- members and veterans. mTBI is linked to long-term development of dementia conditions such as Alzheimer's disease and related disorders, but the exact pathophysiologic mechanisms remain poorly-defined. Vascular disease and cardiovascular risk factors are strongly linked with dementia. We propose to test the hypothesis that long-term mTBI-induced cognitive dysfunction is due to, at least in part, persistent cerebrovascular dysfunction. We will also test the hypothesis that early onset mTBI and later development of hypertension will have synergistic effects on cerebrovascular and cognitive dysfunction compared to hypertension or mTBI alone. In Aim 1, we will measure the temporal changes (subacute and chronic) in cerebrovascular and cognitive function in a rat model of mTBI while establishing the mechanistic role of cerebrovascular dysfunction in mTBI-induce cognitive impairment. Following midline fluid percussion injury or sham surgery in Sprague-Dawley rats, we will measure subacute (8 weeks) and chronic (12 months) cerebrovascular function (in-vivo by brain contrast MRI and ex-vivo by measuring cerebral artery vasoreactivity) and cognitive function and establish their relationship. We will also determine if early (starting at 2 weeks post-injury) or late (starting at 10 months post-injury) aerobic exercise training will improve cerebrovascular function leading to improvement in cognitive function. We will identify molecular mechanisms by which cerebrovascular function modulates cognitive function in mTBI by investigating the role of endothelial function in the regulation of brain-derived neurotrophic factor. In Aim 2, we will probe the interaction between early onset mTBI and later development of hypertension in chronic cerebrovascular and cognitive dysfunction. Here we will use rats genetically prone to develop hypertension (spontaneously hypertensive rats) to determine the effects of early onset mTBI in modulating chronic cerebrovascular and cognitive function. We will also have an exploratory aim to look at effects of mTBI in Sprague-Dawley and hypertensive rats on cardiac structure and function and coronary artery function. The proposal could provide critical and novel insights on the mechanisms underlying vascular dysfunction in TBI and their role in the development of cognitive dysfunction.

Abstract Mild traumatic brain injury (mTBI) is a major cause of mortality and morbidity especially among service- members and veterans. mTBI is linked to long-term development of dementia conditions such as Alzheimer's disease and related disorders, but the exact pathophysiologic mechanisms remain poorly-defined. Vascular disease and cardiovascular risk factors are strongly linked with dementia. We propose to test the hypothesis that long-term mTBI-induced cognitive dysfunction is due to, at least in part, persistent cerebrovascular dysfunction. We will also test the hypothesis that early onset mTBI and later development of hypertension will have synergistic effects on cerebrovascular and cognitive dysfunction compared to hypertension or mTBI alone. In Aim 1, we will measure the temporal changes (subacute and chronic) in cerebrovascular and cognitive function in a rat model of mTBI while establishing the mechanistic role of cerebrovascular dysfunction in mTBI-induce cognitive impairment. Following midline fluid percussion injury or sham surgery in Sprague-Dawley rats, we will measure subacute (8 weeks) and chronic (12 months) cerebrovascular function (in-vivo by brain contrast MRI and ex-vivo by measuring cerebral artery vasoreactivity) and cognitive function and establish their relationship. We will also determine if early (starting at 2 weeks post-injury) or late (starting at 10 months post-injury) aerobic exercise training will improve cerebrovascular function leading to improvement in cognitive function. We will identify molecular mechanisms by which cerebrovascular function modulates cognitive function in mTBI by investigating the role of endothelial function in the regulation of brain-derived neurotrophic factor. In Aim 2, we will probe the interaction between early onset mTBI and later development of hypertension in chronic cerebrovascular and cognitive dysfunction. Here we will use rats genetically prone to develop hypertension (spontaneously hypertensive rats) to determine the effects of early onset mTBI in modulating chronic cerebrovascular and cognitive function. We will also have an exploratory aim to look at effects of mTBI in Sprague-Dawley and hypertensive rats on cardiac structure and function and coronary artery function. The proposal could provide critical and novel insights on the mechanisms underlying vascular dysfunction in TBI and their role in the development of cognitive dysfunction.