Neuroprotective Effects of Oleanolic Acid and Erythrodiol in Prodromal Alzheimer's Disease
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 发起方
- 入组人数
- 120
- 试验地点
- 1
- 主要终点
- Conversion from prodromal Alzheimer's disease to dementia
研究概览
简要总结
Alzheimer's disease begins many years before memory problems become obvious. People in the early ("prodromal") stage have memory complaints but are still independent in daily life. At present there is no treatment that prevents this stage from progressing to dementia.
Olive oil contains two natural compounds, oleanolic acid and erythrodiol. Earlier work by this research team suggests that these compounds may reduce inflammation and oxidative stress and may improve the way the body handles sugars and fats, processes that are also altered in Alzheimer's disease.
This study will test whether consuming olive oils that contain these compounds delays the progression from prodromal Alzheimer's disease to dementia.
A total of 120 adults aged 50 to 80 years with prodromal Alzheimer's disease will take part at three public hospitals in southern Spain. Participants will be assigned by chance to one of three groups and will consume 55 mL per day of one of three oils for 12 months: olive oil enriched with oleanolic acid, pomace olive oil (which naturally contains both compounds), or a standard commercial olive oil with very low levels of these compounds. Neither the participants nor the staff assessing them will know which oil each person is receiving.
Participants will attend study visits at the start of the study and after 6 and 12 months. At these visits they will complete memory and thinking tests, a physical and nutritional assessment, and blood and urine tests.
详细描述
NEUROLEA is a multicenter, randomized, double-blind, controlled dietary intervention trial coordinated by the Instituto de la Grasa (CSIC). Participants will be recruited at the Neurology Units of Hospital Universitario Virgen del Rocío, Hospital Universitario Reina Sofía and Hospital Universitario de Valme.
Study oils. High-purity crystalline oleanolic acid (>95%) will be obtained from olive leaves following a procedure developed by the research team (Spanish Patent ES2160553) and used to prepare an oleanolic acid-enriched olive oil (600 mg/kg) according to European Patent EP18382510. A commercial olive oil 0.4° will serve as the control oil, as it has the same fatty acid composition as the other oils but a very low content of minor bioactive components. Pomace olive oil, which naturally contains oleanolic acid and erythrodiol, will be purchased from local markets. Oil composition will be verified by gas chromatography and differential scanning calorimetry before the intervention begins.
Randomization and blinding. Allocation will follow computer-generated random numbers prepared by the trial coordinator. Participants, clinical and nutritional research staff, and the neuropsychologists scoring the cognitive assessments will be blinded to group assignment.
Sample size. Thirty-four participants per arm are required for 90% power to detect a 10% reduction in dementia incidence in the functional oil arms compared with a 25% incidence in the control arm over 12 months (alpha 0.05). Allowing for up to 15% attrition in a long-term dietary intervention, the target is 40 participants per arm (120 in total).
Intervention and follow-up. Participants will consume 55 mL/day of the assigned oil, preferably raw and distributed across the three main meals, for 12 months. Adherence will be assessed with the self-reported Haynes-Sackett compliance test and by return of empty bottles, methods previously used by this team in the PREDIABOLE and OLTRAD trials. Participants and their caregivers will receive general healthy-eating guidance throughout the study.
研究设计
- 研究类型
- 干预性
- 分配方式
- 随机
- 干预模型
- 平行分组
- 主要目的
- 预防
- 盲法
- 四盲 (受试者、医护人员、研究者、结局评估者)
入排标准
- 年龄范围
- 50 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- Men and women aged 50 to 80 years Diagnosis of prodromal Alzheimer's disease, meeting all of the following: memory complaints corroborated by a reliable informant; Mini-Mental State Examination (MMSE) total score between 22 and 30; Free and Cued Selective Reminding Test (FCSRT, picture version) total recall score of 46 or less; Clinical Dementia Rating Global Score (CDR-GS) of 0.5; functional independence in activities of daily living (Functional Activities Questionnaire total score of 8 or less); plasma p-tau 217 above 0.45 pg/mL measured by the Lumipulse method Ability and willingness to attend scheduled visits at the study center Adequate visual and auditory capacity to complete study evaluations Educational level sufficient to read and write Written informed consent
排除标准
- Absence of a reliable informant Evidence, based on medical history or clinical evaluation, of a neurological condition other than Alzheimer's disease that could account for the cognitive impairment Clinically significant, advanced or unstable systemic disease that may interfere with cognitive evaluation Severe psychiatric disorders, including schizophrenia, bipolar disorder or active major depression History of alcohol or psychotropic substance abuse Pre-existing intellectual disability that precludes neuropsychological evaluation
研究组 & 干预措施
OA-enriched Olive Oil
Participants will consume 55 mL/day of olive oil enriched with oleanolic acid (600 mg/kg) for 12 months, preferably raw and distributed across the three main meals.
干预措施: Oleanolic acid-enriched olive oil (Dietary Supplement)
Pomace Olive Oil
Participants will consume 55 mL/day of commercial pomace olive oil, which naturally contains oleanolic acid (180 mg/kg) and erythrodiol (670 mg/kg), for 12 months, preferably raw and distributed across the three main meals.
干预措施: Pomace olive oil (Dietary Supplement)
Control Olive Oil
Participants will consume 55 mL/day of commercial olive oil 0.4°, which has the same fatty acid composition but a very low content of minor bioactive components, for 12 months, preferably raw and distributed across the three main meals.
干预措施: Commercial olive oil 0.4 degrees (Dietary Supplement)
结局指标
主要结局
Conversion from prodromal Alzheimer's disease to dementia
时间窗: Baseline to 12-months
Proportion of participants converting to dementia, defined as a change in the Clinical Dementia Rating Global Score (CDR-GS) from 0.5 at baseline to 1 or higher. The CDR-GS ranges from 0 to 3, with higher scores indicating greater dementia severity
次要结局
- Change in Clinical Dementia Rating Sum of Boxes (CDR-SB)(Baseline to 12-months)
- Change in Mini-Mental State Examination (MMSE) score(Baseline to 12-months)
- Change in Mild Behavioral Impairment Checklist (MBI-C) score(Baseline to 12-months)
- Change in Functional Activities Questionnaire (FAQ) score(Baseline to 12-months)
研究者
Elena M. Yubero-Serrano
Research Scientist
Instituto de la Grasa
研究点 (1)
标识符
- NCT 编号
- NCT07847944
- 其他研究编号
- PID2024-161189OB-I00
日期
- 首次提交
- (8天前)
- 首次发布
- (昨天)
- 主要完成日期
- (2年后)
- 研究完成日期
- (2年后)
- 最近核实
- (29天前)
- 最近更新
- (昨天)
监管与共享
- FDA 监管药物
- 否
- FDA 监管器械
- 否
- 个体参与者数据共享计划
- 是
- 是否有结果
- 否
De-identified individual participant data underlying published results will be made available in institutional repositories, in accordance with the data management plan of the project and with international standards for the documentation of clinical study data.