抗合成酶综合征的环境危险因素
Background:
- Like other complex diseases, autoimmune diseases are the result of numerous causes, including genetic and environmental factors. Some researchers believe that people who are susceptible to autoimmune disorders develop them when the body reacts to environmental or other factors by creating white blood cells that attack the body s own tissues, which then progresses to autoimmune diseases. These immune-triggered disorders can overlap with one another to some extent, but most autoimmune diseases have certain distinct triggers.
- The autoimmune disorder myositis weakens the muscles and may cause other health problems. Environmental exposures associated with myositis include ultraviolet radiation, stressful life events and muscle overexertion, collagen implants, infections such as retroviruses and streptococci bacteria, and certain drugs and chemicals. Some individuals with myositis also produce proteins in the blood called autoantibodies that react with certain parts of the person s own cells, called synthetases, which are involved in making new proteins. A syndrome called the anti-synthetase syndrome, which includes myositis and lung disease, is associated with having the anti-synthetase autoantibodies. Researchers are interested in studying differences in environmental exposures in individuals with myositis. This study is being conducted to determine if persons with the anti-synthetase syndrome have had different environmental exposures before disease onset compared with other patients with myositis who do not have this syndrome and also compared with healthy volunteers.
Objectives:
- To determine whether selected infectious and noninfectious environmental exposures are more common in individuals who have myositis with the anti-synthetase syndrome, compared with healthy volunteers.
Eligibility:
- Individuals who have been diagnosed with myositis (with or without anti-synthetase autoantibodies), and healthy volunteers without autoimmune disorders.
Design:
- Participants will be screened with a full medical history and physical examination, and will provide blood, urine and house dust samples.
- Participants will complete questionnaires about their medical history and the types of exposures they have had at work, at home, and elsewhere. Participants who have myositis will also be asked about certain infections, heavy exercise or physical exertion, sun exposure, tobacco and alcohol use, and stressful events prior to being diagnosed with the disease. Healthy volunteers will be asked about the same exposures before the date of diagnosis of disease of the myositis subject to which they have been matched.
- Participants will receive a kit that contains instructions and a filter to be put onto their vacuum cleaner to collect house dust in the bedroom. This dust will be kept for possible future analyses of infectious or toxic agents based on the other results from the study.
- Individuals with myositis will have other tests as clinically indicated, including lung function tests and imaging studies.
研究概览
详细说明
Most autoimmune diseases are thought to develop as a result of chronic immune activation and dysregulation after selected environmental exposures in genetically susceptible individuals. Based on prior studies suggesting roles for noninfectious and infectious agents in the development of myositis, as well as the known clinical, epidemiologic and genetic differences among phenotypes, we hypothesize that different myositis phenotypes are triggered by different environmental exposures in genetically susceptible individuals. One phenotype that is particularly well-defined clinically and genetically, and for which environmental triggers are likely, is myositis associated with anti-synthetase autoantibodies (defined as the anti-synthetase syndrome). These patients have an acute myositis onset in the spring of the year and also tend to develop fevers, elevated white blood cell counts, arthritis and interstitial lung disease. Although these features are consistent with an environmental trigger for the anti-synthetase syndrome, and although case reports and animal models suggest infectious or noninfectious agents may play a role, no study has systematically assessed environmental agents in this population.
In collaboration with multiple centers, we plan to test the hypothesis that certain environmental exposures are associated with the anti-synthetase syndrome and differ from those seen in matched controls and in myositis patients without the anti-synthetase syndrome. The specific aims of this study are to: 1) determine whether selected noninfectious environmental exposures are more common preceding disease onset in 150 recent-onset (defined as within 24 months of meeting criteria for possible, probable or definite myositis) myositis patients with the anti-synthetase syndrome, compared with 150 control subjects without autoimmune disease (1:1 matched with the patients), and compared with 150 recent-onset myositis patients without the anti-synthetase syndrome; and 2) determine whether selected infectious agents can be detected more frequently in blood samples of recent-onset anti-synthetase syndrome patients compared with matched controls, and in blood or biopsy samples from recent-onset anti-synthetase myositis patients compared with recent-onset myositis patients without the anti-synthetase syndrome.
Medical histories, concurrent conditions and environmental questionnaire information will be collected from all participants. Subjects will undergo a clinical, laboratory and immunologic assessment to document current diagnoses, disease manifestations and severity. A chest x-ray, high resolution computed tomography (HRCT) of the chest, pulmonary function tests, bronchoalveolar lavage, and muscle and lung biopsies will be performed as clinically indicated. Blood DNA and RNA sera, biopsy and house dust repositories will be created for current and future investigations.
研究类型
注册 (估计的)
联系人和位置
学习联系方式
- 姓名：Adam I Schiffenbauer, M.D.
- 电话号码：(301) 451-6270
- 邮箱：schiffenbauera2@mail.nih.gov
学习地点
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Florida
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Miami、Florida、美国、33101
- 撤销
- University of Miami Hospital
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Maryland
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Baltimore、Maryland、美国、21205
- 完全的
- Johns Hopkins University
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Bethesda、Maryland、美国、20892
- 招聘中
- National Institutes of Health Clinical Center
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接触：
- NIH Clinical Center Office of Patient Recruitment (OPR)
- 电话号码：TTY dial 711 800-411-1222
- 邮箱：ccopr@nih.gov
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Rockville、Maryland、美国、20853
- 完全的
- Mid-Atlantic Kaiser Permanente
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Massachusetts
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Boston、Massachusetts、美国、02115
- 完全的
- Brigham and Women's Hospital
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Minnesota
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Rochester、Minnesota、美国、55905
- 完全的
- Mayo Clinic, Rochester
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North Carolina
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Research Triangle Park、North Carolina、美国、27709
- 招聘中
- NIEHS Clinical Research Unit (CRU)
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接触：
- Adam Schiffenbauer, M.D.
- 电话号码：301-451-6270
- 邮箱：schiffenbauera2@mail.nih.gov
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Pennsylvania
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Pittsburgh、Pennsylvania、美国、15261
- 完全的
- University of Pittsburgh
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
取样方法
研究人群
General population; There are no gender or ethnic restrictions to enrollment in the study. Age restrictions for children do apply to enrollment in the study.@@@@@@
描述
- INCLUSION CRITERIA:
There are no gender or ethnic restrictions to enrollment in the study. Age restrictions for children do apply to enrollment in the study.
The inclusion criteria for enrollment of myositis subjects are:
- Diagnosis of myositis based on criteria for possible, probable or definite PM or DM, with or without other connective tissue diseases, documented within 24 months of enrollment (using the most recent diagnosis date to define the 24-month period).
- CXR to assess possible ILD and assign the subject to the presumptive anti-synthetase positive or negative category if clinically indicated.
- Children must be greater than two years of age.
- Able and willing to give informed consent, to complete the questionnaires and to donate blood samples (in case of children greater than 2 years of age but <18 years of age, parent/legal guardian must be willing and able to provide informed consent and child will provide assent according to child s maturity level and understanding).
The exclusion criteria for myositis subjects are:
- Cancer-associated myositis (cancer diagnosed within 2 years of the diagnosis of myositis).
- Inclusion body myositis.
- Myositis that has clearly developed as the result of a drug, toxin or other exposure and has resolved after discontinuation of the exposure to that agent.
- Children less than 2 years of age.
The inclusion criteria for controls are:
- Friends or, if friends are not available, cousins of the anti-synthetase-positive myositis patient, or, if friends or cousins are not available, volunteers from the general community (such as the NIH Normal volunteer program), race- gender- and age- (within 5 years for minors and within 10 years for adults) matched, and when possible who is living as close as possible to the geographic area of the myositis patient.
- Controls should be without a recognized autoimmune disease or ILD.
- Able and willing to give informed consent, to complete the questionnaires and to donate blood samples (in case of children greater than 2 years of age but <18 years of age, parent/legal guardian must be willing and able to provide informed consent) and child will provide assent according to child maturity level and understanding).
The exclusion criteria for all protocol subjects are:
- Medical illness that in the judgment of the investigators does not allow safe blood draws or other clinical evaluations needed for study participation.
- Cognitive impairment.
- Not able or willing to give informed assent or consent.
- Children less than 2 years of age.
- Patients who at their reference date were not in the US or Canada
- Individuals currently incarcerated
HIV considerations:
HIV is not an exclusion for affected participants in this study for the two following reasons:
- It has no impact on study procedures or tests.
- It may be one of the viral risk factors we are investigating.
学习计划
研究是如何设计的？
设计细节
- 观测模型：CASE_CONTROL
- 时间观点：CROSS_SECTIONAL
队列和干预
团体/队列 |
|---|
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Antisynthetase Negative
Subjects with myositis without antisynthetase syndrome |
|
Antisynthetase Positive
Subject with myositis with antisynthetase syndrome |
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Healthy Control
Subjects without autoimmune disease |
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 |
|---|---|---|
|
To determine whether selected noninfectious environmental exposures are more common prior to disease in recent-onset pts. w/anti-sythetase syndrome compared w/controls w/o autoimmune disease (1:1 matched with the pts.) and compared w/recent-onse...
大体时间：Enrollment
|
Environmental Questionnaire (EQ) and Child Environmental Questionnaire (CQ) |
Enrollment
|
合作者和调查者
调查人员
- 首席研究员：Adam I Schiffenbauer, M.D.、National Institute of Environmental Health Sciences (NIEHS)
出版物和有用的链接
研究记录日期
研究主要日期
学习开始 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计的)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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