提高老年人的疫苗保护力
使用AS01佐剂通过训练免疫提升老年人免疫反应
研究概览
地位
详细说明
随着年龄增长,免疫系统反应性降低,增加感染易感性并降低疫苗反应性。 AS01是一种脂质体佐剂,用于已获许可的疫苗(如带状疱疹疫苗),可激活先天性和适应性免疫。 新证据表明,AS01还可能诱导训练免疫,这是一种先天性免疫重编程形式,可能增强对无关感染的保护。 本研究测试单独给予AS01是否能增强并训练健康成年人的免疫系统、这些效应持续多长时间,以及这是否能转化为对异源病毒攻击的更好控制。
这将是新加坡中央医院的一项单中心、随机、单盲、安慰剂对照的实验医学研究(N=40;年龄21-59岁)。 参与者在第0天接受单次肌肉注射剂量的AS01(0.5 mL)或生理盐水安慰剂。为模拟受控病毒暴露,所有参与者随后根据随机分组,在AS01/安慰剂后1个月(第30天)或3个月(第90天)接种已获许可的减毒黄热病活疫苗(YF17D,Stamaril)。 连续血液采样测量免疫重编程、持久性以及对病毒攻击的反应,根据分配情况持续约2或4个月。
研究结果可能阐明AS01是否可作为独立的免疫增强剂,快速增强广泛保护。 这些信息可能对疫情防范有用,尤其是在病原体特异性疫苗可用之前。
因此,将测量和分析:(1)AS01后的早期和持久先天性免疫变化(如骨髓/先天细胞中的基因表达和表观遗传标记);(2)疫苗接种后的YF17D病毒血症(RNA血症)作为异源病毒控制的指标;(3)对YF17D的T细胞和B细胞反应及其与病毒血症的关系。
AS01和YF17D在与其指定疫苗一起使用时是已获许可的成分。 常见反应包括局部注射部位症状和短暂的全身症状;YF17D曾报告罕见的严重不良事件。 在整个研究过程中,参与者受到监测,并获得安全指导和联系途径。
研究类型
注册 (估计的)
阶段
- 阶段2
联系人和位置
学习联系方式
- 姓名:Candice Y.Y. Chan, MBChB, MRCP
- 电话号码:+6563213479
- 邮箱:candice.chan.y.y@singhealth.com.sg
研究联系人备份
- 姓名:Christina Titin
- 电话号码:+6565762802
- 邮箱:christina.titin@singhealth.com.sg
学习地点
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Singapore、新加坡、169608
- 招聘中
- Singapore General Hospital
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接触:
- Candice Y.Y. Chan, MBChB, MRCP
- 电话号码:+6563213479
- 邮箱:candice.chan.y.y@singhealth.com.sg
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接触:
- Christina Titin
- 电话号码:+6565762802
- 邮箱:christina.titin@singhealth.com.sg
-
首席研究员:
- Candice Y.Y. Chan, MBChB, MRCP
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参与标准
资格标准
适合学习的年龄
- 成人
接受健康志愿者
描述
纳入标准:
- 筛选时年龄在21至59岁之间的成人。
- BMI 18.5 - 27.5 kg/m2(亚洲人群BMI值依据MOH指南NIH共识会议标准)。
- 通过体格评估确认基线医疗状况良好且健康状况稳定。 对于有基础合并症的受试者,其病情必须被研究者判定为稳定,且在过去6个月内未因这些病情住院。
- 自愿参与、理解并签署伦理审查委员会批准的知情同意书。
- 愿意遵守研究方案和预定访视要求的受试者。 这些要求包括完成受试者日记、返回进行随访。 受试者还应愿意在研究期间保持可联系状态,并拥有稳定的联系方式。
- 前臂有可供抽血的静脉通路。
- 因手术绝育(子宫切除术、双侧卵巢切除术或输卵管结扎)或绝经而无生育潜力的女性受试者。 绝经后受试者必须至少有12个月的自然(自发性)闭经史。
排除标准:
- 既往接种过黄热病或登革热疫苗(无论是注册产品还是参与先前疫苗研究)。
- 既往接种过AS01佐剂疫苗(例如重组带状疱疹疫苗、RTS,S/AS01、RSVPre-F3-AS01),无论是注册产品还是参与先前疫苗研究。
- 计划在研究期间接种除研究疫苗外的AS01佐剂疫苗或黄热病疫苗。
- 筛选前7天内身体不适的受试者。
- 有明确记录的黄热病和/或登革热感染史。
- 筛选时登革热血清学检测阳性。
- 过去1年内有吸烟史。
- 计划在研究期间前往黄热病流行国家旅行。
- 已知对AS01和YF17D疫苗或其成分(例如鸡蛋制品)过敏。
- 根据美国糖尿病协会标准62,诊断为糖尿病且HBA1c > 6.5。
- 任何经研究者判断会使肌肉注射不安全的医疗状况(例如血小板计数<50x10^9/L的血小板减少症、凝血障碍、抗凝治疗)。
存在减毒活疫苗风险因素,包括基于病史和体格检查确认或怀疑的原发性或获得性免疫缺陷:
- 胸腺疾病史
- 血液系统肿瘤,包括白血病、淋巴瘤、骨髓增生异常综合征
- 筛选前3年内诊断出癌症或接受癌症治疗(局部基底细胞癌除外)
- 移植后:实体器官移植和造血干细胞移植
- 因原发性或获得性(包括HIV/AIDS)免疫缺陷导致免疫功能低下
- 其他显著免疫功能低下状况
- 过去7天内使用过抗炎药物(例如非甾体抗炎药、扑热息痛、阿司匹林)。
- 过去1个月内使用过二甲双胍。
- 首次接种疫苗前6个月内使用过皮质类固醇(定义为泼尼松龙>10 mg/天或等效剂量>2周,或泼尼松龙>40 mg/天>1周)。 允许使用吸入性和局部类固醇。
- 过去12个月内接受过生物制剂(如抗TNF抑制剂、IL-1抑制剂、共刺激阻断剂、B细胞耗竭疗法)。
- 任何经研究者认为可能使研究复杂化、损害受试者健康或妨碍研究完成的状况(例如广泛性银屑病、慢性疼痛综合征、严重听力损失、认知障碍、透析、自身免疫性疾病)。
- 有药物滥用证据或既往药物滥用史。
- 临床显著贫血(Hb < 10 g/dL)。
- 过去3个月内献血量>450 ml。
- 过去四个月内参与过涉及试验性或非试验性化合物给药的研究,或计划在本研究期间参与此类研究。
- 首次研究疫苗接种前30天内接种过任何许可疫苗,或计划在研究疫苗接种后30天内接种此类产品。
- 研究疫苗首剂接种前90天内接受过免疫球蛋白或任何血液制品,或计划在研究期间接受此类产品。
学习计划
研究是如何设计的?
设计细节
- 主要用途:预防
- 分配:随机化
- 介入模型:并行分配
- 屏蔽:单身的
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
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实验性的:AS01 + YF17D 1个月后
参与者在第0天接受AS01(0.5 mL 肌内注射),并在第30天接受黄热病疫苗YF17D。
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Stamaril是一种减毒活黄热病疫苗,采用YF17D毒株。
Stamaril以粉末和溶剂形式供应,用于预充式注射器中制备混悬液注射剂,黄热病疫苗(活疫苗)。
其他名称:
The AS01 suspension contains 50 mcg/micrograms of 3-O-desacyl-4'monophosphoryl lipid A (MPL) and 50 mcg/micrograms of Quillaja Saponaria Molina, fraction 21 (QS21), licensed by GSK, available as a separate vial from the licensed Shingrix vaccine.
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实验性的:AS01 + YF17D 在 3 个月时
参与者于第0天肌肉注射AS01(0.5毫升),并于第90天接种黄热病疫苗YF17D。
|
Stamaril是一种减毒活黄热病疫苗,采用YF17D毒株。
Stamaril以粉末和溶剂形式供应,用于预充式注射器中制备混悬液注射剂,黄热病疫苗(活疫苗)。
其他名称:
The AS01 suspension contains 50 mcg/micrograms of 3-O-desacyl-4'monophosphoryl lipid A (MPL) and 50 mcg/micrograms of Quillaja Saponaria Molina, fraction 21 (QS21), licensed by GSK, available as a separate vial from the licensed Shingrix vaccine.
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安慰剂比较:安慰剂 + YF17D 在 1 个月时
参与者接受安慰剂(0.9%生理盐水,第0天肌肉注射0.5毫升)并在第30天接种黄热病疫苗YF17D。
|
Stamaril是一种减毒活黄热病疫苗,采用YF17D毒株。
Stamaril以粉末和溶剂形式供应,用于预充式注射器中制备混悬液注射剂,黄热病疫苗(活疫苗)。
其他名称:
安慰剂将由等体积的0.9%生理盐水组成。
其他名称:
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安慰剂比较:安慰剂 + YF17D(3个月时)
参与者接受安慰剂(0.9% 生理盐水,第 0 天肌内注射 0.5 毫升)并在第 90 天接种黄热病疫苗 YF17D。
|
Stamaril是一种减毒活黄热病疫苗,采用YF17D毒株。
Stamaril以粉末和溶剂形式供应,用于预充式注射器中制备混悬液注射剂,黄热病疫苗(活疫苗)。
其他名称:
安慰剂将由等体积的0.9%生理盐水组成。
其他名称:
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研究衡量的是什么?
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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宿主免疫反应
大体时间:第 0、7、14、28、56、84 天(3 个月)
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采用一组经过验证的多组学检测方法,在3个月期间内,对AS01与安慰剂诱导的宿主免疫反应谱(细胞因子、免疫细胞群、基因表达、表观遗传修饰)进行探索性评估。
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第 0、7、14、28、56、84 天(3 个月)
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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病毒血症水平
大体时间:黄热病疫苗接种后7天内
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通过定量RT-PCR测量黄热病病毒血症水平,并计算AS01与安慰剂受试者在接种黄热病疫苗后7天内的曲线下面积(AUC)。
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黄热病疫苗接种后7天内
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B细胞应答
大体时间:30天
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通过斑块减少中和试验(PRNT)测量中和抗体滴度,在接种AS01黄热病疫苗与安慰剂受试者后,比较第30天与接种前第0天的血清,评估对黄热病的B细胞反应。
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30天
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T细胞反应
大体时间:30天
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使用病毒特异性IFNγ ELISPOT检测法评估黄热病疫苗的T细胞反应,结果以每10^6个PBMC中的斑块形成单位(SFU)表示,比较AS01与安慰剂接受者在第14天和第30天相对于第9天(疫苗接种前)的差异。
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30天
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合作者和调查者
调查人员
- 首席研究员:Candice Y.Y. Chan, MBChB, MRCP、Singapore General Hospital
- 首席研究员:Amit Singhal, B.Sc., M.Sc., Ph.D.、A*Star
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- AS01-YF-01
- CIRG25jan-0068 (其他赠款/资助编号:NMRC)
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研究美国 FDA 监管的药品
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