Using Urine to Study Antibodies & Functional Cell-Mediated Immunity in the Context of Chlamydia Trachomatis (URSAFE-CT)
調査の概要
詳細な説明
To date, clinician-collected blood samples are still the primary methods to monitor immune responses to genital tract infections. Replacing these samples with a specimen that is non-invasive and can be self-collected, such as the initial or first-void urine stream or vaginal brushes, could have important acceptance and feasibility advantages and could facilitate the logistics of clinical trials and future epidemiological or vaccine studies. Moreover, these local samples give more information on the immune response at the site of infection, in the genital tract. Initial results of experiments using first-void urine samples and cervicovaginal brushes for immune response monitoring are promising. However, no standardized method for the detection of (functional) Chlamydia trachomatis (CT)-specific immune responses is available to be used on first-void urine or vaginal samples. Therefore, the aim of this pilot study is to determine feasibility to detect mucosal immune responses in first-void urine and self-collected vaginal samples. Furthermore, we will compare local immune responses with systemic immunity.
The primary objectives of this study are:
- To explore the feasibility to detect (functional) CT-specific antibodies and CT-specific cellular immune responses in first-void urine or self-collected vaginal samples.
- To compare levels of total and CT-specific antibodies in first-void urine and serum.
- To compare mucosal and systemic CT-specific cellular immune responses in mucosal mononuclear cells derived from first-void urine or self-collected vaginal samples, and peripheral blood mononuclear cells (PBMCs).
A total of 73 female participants will be included in this trial. Women that can be included have to be positive for a Chlamydia trachomatis nuclear acid amplification test (NAAT) on a vaginal or FVU sample, and have not yet been treated with antibiotic therapy.
The study described is a low-interventional observational study. Participants will self-collect a first-void urine sample using a 20 mL Colli Pee® device (Novosanis), followed by a vaginal brush (Evalyn® brush, Rovers). Medical personnel at the study site will collect a blood sample (one serum tube and 2 heparin tubes). Furthermore, personal data is collected via a paper-based questionnaire.
研究の種類
入学 (推定)
連絡先と場所
研究連絡先
- 名前：Anne Van Caesbroeck
- 電話番号：+32 476 01 48 43
- メール：anne.vancaesbroeck@uantwerpen.be
研究場所
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Antwerp
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Antwerp、Antwerp、ベルギー、2000
- 募集
- Violett Antwerp
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コンタクト：
- Ward Bauwens, MD
- 電話番号：+32 3 293 95 91
- メール：info@violett.be
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参加基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
サンプリング方法
調査対象母集団
説明
Inclusion Criteria:
- Female
- Chlamydia trachomatis NAAT positive vaginal sample or first-void urine sample.
- Able to understand the information brochure and what the study is about.
- Willing to give informed consent to use their samples for details described in the study protocol.
Exclusion Criteria:
- Pregnancy (self-reported)
- Being positive for Human Immunodeficiency Virus (HIV)
- Women that underwent hysterectomy.
- Menstruation at the time of sample collection.
- Current use of antibiotics effective against Chlamydia trachomatis (doxycyline or azithromycine) or use of such antimicrobials in the past 14 days before participating in the study.
- Participating in another clinical trial at the same time of participating in this study.
- Having a history or current evidence of any condition or abnormality that might confound the results of the study or is not in the best interest of the individual to participate, in the opinion of the investigator.
研究計画
研究はどのように設計されていますか？
デザインの詳細
この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Concentration of total and Chlamydia-specific immunoglobulins in first-void urine and serum samples
時間枠：Within 6 months after study completion
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Concentration of total and Chlamydia-specific immunoglobulins in first-void urine and serum samples determined using ELISA-based assays and the correlation of antibody titers between both sample types.
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Within 6 months after study completion
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Number of Chlamydia-specific SFCs per million cells
時間枠：Within 6 months after study completion
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Quantification of antigen-specific cells in cells isolated from first-void urine samples, vaginal brush samples and whole blood samples (PBMC) using ELISpot-based assays.
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Within 6 months after study completion
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Measurement of percentage and median fluorescence intensity (MFI) of immune cell subsets in blood, first-void urine and vaginal brush samples.
時間枠：Within 6 months after study completion.
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Measuring percentage and MFI of immune cell subsets using flow cytometry
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Within 6 months after study completion.
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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STI DNA status of first-void urine and vaginal brush samples.
時間枠：Within 6 months after study completion.
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Nuclear acid amplification test for the presence of DNA from different sexually transmitted infections (including Chlamydia, Mycoplasma genitalium, Mycoplasma hominis, Neisseria gonorrhea, Trichomonas vaginalis, Ureaplasma parvum, Ureaplasma urealyticum) to investigate Chlamydia clearance or persistent infection and determine coinfections.
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Within 6 months after study completion.
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Other biomarkers
時間枠：Within 6 months after study completion.
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To test other biomarkers to normalize immune biomarkers measured in primary outcomes (antibody or cellular immune responses), for example total IgG, IgG subclasses, total protein, total human DNA etc.
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Within 6 months after study completion.
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協力者と研究者
スポンサー
協力者
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (推定)
研究の完了 (推定)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
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