Dynamics of the Urinary Bacterial Microbiota of Patients With Urinary Tract Infection
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 108
- 试验地点
- 1
- 主要终点
- Composition of the urinary microbiota (urotypes) of patients in the "UI" groups
研究概览
简要总结
Urinary tract infections (UTIs) are one of the most common bacterial infections in humans (Flores-Mireles et al., 2015). They rank first among healthcare-associated infections (Daniau et al., 2020) and second among community-acquired infections. Their diagnosis is based on the presence of urinary symptoms, confirmed by performing a urine culture culture (UCEC), which consists of collecting the patient's bladder urine. Urine samples are generally considered sterile when they do not allow the identification of uropathogenic bacteria using standard clinical culture procedures (Caron et al., 2018). However, conventional urine culture has low sensitivity, with the rate of positive urine cultures in patients with acute cystitis being estimated at 60% (Schmiemann et al., 2010). It is now established that urine has its own microbiota, that is, a set of microorganisms residing in the bladder, most of which are not cultivable under conventional laboratory conditions.
The relationship between the dynamics of urinary microbiota composition and the pathobiology of UTIs is beginning to be studied in humans (Neugent et al., 2020). Price et al. analyzed the urine of women with UTI symptoms using EQUC culture, compared to a symptom-free control group (Price et al., 2016). More precise identification of cultured bacteria revealed the presence of bacteria that were not detected using conventional culture (such as Lactobacillus iners, Gardnerella vaginalis, Prevotella sp., and Aerococcus urinae). In addition, sequencing allowed the characterization of polymicrobial communities, present in many of the samples analyzed.
These findings have led to a significant revision of the traditional perception of UTIs. It has thus been suggested that, following a disruption in the homeostasis of the urinary microbiota (urinary dysbiosis), certain bacteria considered commensals of the urinary tract can become pathogenic and lead to UTIs (Gerges-Knafl et al., 2020).
详细描述
Metabolomics allows the study of an individual's metabolic profile. It provides valuable insights into the complex interplay between biology, environment, and lifestyle. Metabolites present in urine could provide unique insights into the pathogenesis of infections, including the host's immune response and the metabolic pathways of the infecting pathogen.
Furthermore, integrating urinary metabolomics with other "omics" technologies, such as microbiome, offers a more comprehensive view of the complex interactions that occur during an infection.
Existing studies of the urinary microbiome are primarily retrospective, conducted on small patient populations, and with little medical data collected.
This study therefore proposes to prospectively enroll 150 subjects (50 patients with proven UTI and 100 healthy volunteers) to study their bacterial urinary microbiota using EQUC and NGS techniques, compared to standard culture results. In addition, precise medical metadata will be collected prospectively and compared with microbiota data.
The research hypothesis is that the composition of the bacterial urinary microbiota differs between patients with clinically proven UTI and those without UTI.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Control
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 45 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Patients with UTI:
- •Between 18 and 45 years old
- •Premenopausal
- •With biological and clinical criteria for UTI
- •Without urinary tract abnormalities
- •Having read the information sheet and not objecting to participation
- •Patient affiliated with social security
- •Healthy volunteers:
- •Between 18 and 45 years old
- •Premenopausal
- •Without biological or clinical criteria for UTI
- •Without urinary tract abnormalities
- •Having read the information sheet and not objecting to participation
排除标准
- •Patients with UTI and Healthy volunteers
- •Pregnancy
- •Patients who do not meet the inclusion criteria
- •Person deprived of liberty by an administrative or judicial decision, person placed under judicial protection, guardianship, or curatorship
结局指标
主要结局
Composition of the urinary microbiota (urotypes) of patients in the "UI" groups
时间窗: At enrollment visit
Evaluation of the abundance of different urotypes detected by the Next Generation Sequencing (NGS) technique in patients in the "UI" groups
Composition of the urinary microbiota (urotypes) of healthy volunteers "absence of UI"
时间窗: At enrollment visit
Evaluation of the abundance of different urotypes detected by the Next Generation Sequencing (NGS) technique in healthy volunteers "absence of UI"
次要结局
- Compare the sensitivity of detecting bacteria in urine using NGS techniques (Illumina and Nanopore) compared to standard and extended culture methods (EQUC).(At enrollment visit)
- Comparison of the diversity and richness of the urinary microbiota of patients in the "UI" vs "no UI" groups(At enrollment visit)
- Comparison of urinary metabolite concentrations in the "UI" vs. "no UI" groups(At enrollment visit)