An Egg-protein Hydrolysate (NWT-03) to Boost Brain Function - Mind Your Blood Vessels
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 44
- 试验地点
- 2
- 主要终点
- Cognitive performance
研究概览
简要总结
Age-related chronic diseases including dementia, type II diabetes mellitus (T2DM) and cardiovascular disease (CVD) become more prevalent and of increasing societal concern. Common denominators of these co-morbidities are insulin-resistance and impaired vascular function. Animal and short-term human studies now suggest that NWT-03 - an egg-protein hydrolysate - improves insulin-sensitivity and peripheral vascular function, which are risk markers for the development of T2DM and CVD. Insulin-resistance is also associated with cognitive decline, while impaired brain vascular function is an important event preceding the development of impaired cognitive performance. The investigators have already shown in a shorter-term trial (12 weeks) beneficial effects of a daily dose of 5.0 g of NWT-03 on cognitive performance. However, underlying mechanisms have not yet been addressed, while the long-term effects remain unknown. Thus, the investigators now hypothesize that NWT-03 beneficially affects cognitive performance and brain vascular function following long-term daily intake.
The primary objectives of this trial are to evaluate in overweight or obese adults (aged 60-75) with subjective cognitive decline (SCD) the effects of a 36-weeks NWT-03 intervention on (1) cognitive performance using a neurophysiological test battery, and (2) cerebral blood flow, as quantified by the current non-invasive gold standard magnetic resonance imaging (MRI) perfusion method Arterial Spin Labeling (ASL). Secondary study objectives are to examine effects on insulin-sensitivity and peripheral vascular function.
This intervention study will have a randomized, controlled, parallel design. The total study duration will be 36 weeks. Forty-four older adults (aged 60-75 years) with a Body Mass Index (BMI) between 25-35 kg/m2 (overweight or obese) and subjective cognitive decline (SCD), as assessed with the cognitive failure questionnaire, will participate. These study individuals are known to be at increased risk of cognitive impairment, allowing for improvement by the intervention. During the study, subjects will receive daily (in the morning) 5.0 g NWT-03 or placebo powders for 36 weeks.
详细描述
Due to the aging population, the number of people with cognitive impairment will have doubled by the year 2035. Also, the number of individuals with type-2 diabetes mellitus (T2DM) and cardiovascular disease (CVD) will have increased substantially. Common denominators of these age-related co-morbidities in humans are insulin-resistance and an impaired vascular function.
Newtricious (NWT)-03 is a novel dietary egg-protein hydrolysate that has proven benefits on glucose and insulin metabolism, as the investigators have recently shown in overweight or obese individuals with T2DM or impaired glucose tolerance. Furthermore, peripheral vascular function was improved. The potential explanation of these effects may arise from the finding that NWT-03 blocks the enzyme dipeptidyl peptidase (DPP)-IV (7) - a pharmaceutical target for the treatment of T2DM and CVD - that beneficially affects insulin metabolism. Compared to the wealth of knowledge about the impact of insulin-sensitivity and peripheral vascular function on the risk of T2DM and CVD, emerging evidence also indicates that these risk markers affect cognitive performance. This is of great interest, since the brain is an insulin sensitive organ and insulin-resistance is associated with cognitive decline, while impaired brain vascular function is a key pathophysiological event preceding the development of an impaired cognitive performance. A study in mice also showed effects of NWT-03 on neuro-inflammation and oxidative stress in the brain. In fact, a decreased expression of TNF-α and improved expression of enzymes involved in anti-oxidative processes were observed. The investigators have also shown in a similar - but shorter-term (12 weeks) - trial beneficial effects of NWT-03 on executive function, as the latency of response was reduced (manuscripts in preparation). In addition, the hen egg-white hydrolysate (i.e. LumiVida) also improved reaction time in middle-aged women. Underlying mechanisms of these hydrolysates on cognitive performance were however not addressed. In our review the investigators summarized the impact of dietary factors and exercise on brain vascular function in adults and discussed the relation between these effects with changes in cognitive performance. It was concluded that studies on the longer-term effects of lifestyle factors, including diet and physical exercise, can improve brain vascular function, which may contribute to the beneficial effects observed on cognitive performance. In addition, longer-term effects remain unknown and only a limited number of parameters related to cognitive performance were studied. Therefore, the investigators propose to perform a long-term placebo-controlled double blind intervention study including functional outcome parameters and study in vivo effects of NWT-03 on brain vascular function, which is a potential target to prevent or slow-down cognitive impairments, and improve cognitive performance. Focus will be on older adults (aged 60-75 years) with a Body Mass Index (BMI) between 25-35 kg/m2 (overweight or obese) and subjective cognitive decline (SCD), as assessed with the cognitive failure questionnaire. These individuals are known to be at increased risk of cognitive impairment, allowing for improvement by the intervention.
Secondary study endpoints are effects on insulin-sensitivity and peripheral vascular function, which are risk markers that may affect cognitive performance. Finally, the investigators will focus on other potential mechanisms underlying effects on brain function (i.e. ambulatory blood pressure, structural brain status, humoral factors, and the more conventional cardiometabolic risk markers) and other perceivable benefits, including general well-being (quality of life, sleep characteristics and mood) and physical fitness.
Effects will be investigated using innovative and emerging non-invasive brain magnetic resonance imaging (MRI)-perfusion methods, while focusing on whole brain and cognitive-control brain areas plus cognitive performance tests. Furthermore, the investigators have reviewed that cerebral blood flow in gray matter is a sensitive and straightforward marker of brain vascular function, which correlates with cognitive performance. Of note, lower cerebral blood flow is associated with accelerated cognitive decline and increased risk of dementia in the general population based on results of the Rotterdam prospective cohort study. Cerebral blood flow changes will be quantified on a Siemens 3 Tesla Magnetom Prisma Fit scanner at the Scannexus research facilities by the non-invasive gold standard approach: the MRI perfusion method pseudo-continuous Arterial Spin Labeling.Cognitive performance will be assessed using CANTAB (i.e. Cambridge Neuropsychological Test Automated Battery). These validated assessments for state-of-the-art cognitive testing focus on the main cognitive domains (i.e. executive function, attention and memory). Brain vascular function will be investigated using innovative and emerging non-invasive brain magnetic resonance imaging (MRI)-perfusion methods, while focusing on whole brain and cognitive-control brain areas plus cognitive performance tests. Furthermore, the investigators have reviewed that cerebral blood flow in gray matter is a sensitive and straightforward marker of brain vascular function, which correlates with cognitive performance. Of note, lower cerebral blood flow is associated with accelerated cognitive decline and increased risk of dementia in the general population based on results of the Rotterdam prospective cohort study. Cerebral blood flow changes will be quantified on a Siemens 3 Tesla Magnetom Prisma Fit scanner at the Scannexus research facilities by the non-invasive gold standard approach: the MRI perfusion method pseudo-continuous Arterial Spin Labeling.
Considering the background information given in the previous paragraph, the following research questions are formulated:
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 60 Years 至 75 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Men and women, aged between 60-75 years
- •Subjective cognitive decline (SCD)
- •BMI between 25-35 kg/m2
- •Fasting plasma glucose < 7.0 mmol/L
- •Fasting serum total cholesterol < 8.0 mmol/L (further testing will be performed for excessive hyperlipidemia [serum total cholesterol ≥ 8.0 mmol/L] according to the Standard for cardiovascular risk management of NHG)
- •Fasting serum triacylglycerol < 4.5 mmol/L
- •Systolic blood pressure < 160 mmHg and diastolic blood pressure < 100 mmHg
- •Stable body weight (weight gain or loss < 3 kg in the past three months)
- •Willingness to give up being a blood donor from 8 weeks before the start of the study, during the study and for 4 weeks after completion of the study
- •No difficult venipuncture as evidenced during the screening visit
排除标准
- •Left-handedness
- •Current smoker, or smoking cessation < 12 months
- •Diabetic patients
- •Familial hypercholesterolemia
- •Abuse of drugs
- •More than 3 alcoholic units per day
- •Use of vitamin or mineral supplements known to interfere with the main outcomes as judged by the principal investigators within the previous 1-month
- •Use of medication to treat blood pressure, lipid or glucose metabolism
- •Use of an investigational product within another trial within the previous 1-month
- •Severe medical conditions that might interfere with the study, such as epilepsy, asthma, kidney failure or renal insufficiency, chronic obstructive pulmonary disease, inflammatory bowel diseases, auto inflammatory diseases and rheumatoid arthritis
- •Active cardiovascular disease like congestive heart failure or cardiovascular event, such as an acute myocardial infarction or cerebrovascular accident
- •Contra-indications for MRI imaging (e.g. pacemaker, surgical clips/material in body, metal splinter in eye, claustrophobia)
结局指标
主要结局
Cognitive performance
时间窗: Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period
Cambridge Neuropsychological Test Automated Battery (CANTAB)
Brain Vascular Function
时间窗: Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period
Cerebral blood flow as quantified non-invasively by the MRI perfusion method Arterial Spin Labeling (ASL)
次要结局
- Peripheral vascular function (1)(Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period)
- Peripheral vascular function (4)(Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period)
- Peripheral vascular function (2)(Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period)
- Peripheral vascular function (3)(Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period)
- Glucose metabolism(Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period)
- Peripheral vascular function (5)(Change in outcomes at the end of a 36-week protein hydrolysate intervention and 36-week control period)