大肠杆菌在尿路感染和尿路感染时的铁吸收
Beata Krawczyk1,2, Paweł Wityk1,2, Agnieszka Laskowska1
1Department of Biotechnology and Microbiology, Faculty of Chemistry, Gdańsk University of Technology, Gdańsk, Poland.
PloS one
|June 26, 2025
概括
铁的吸收系统,特别是像菌素,有氧菌素和yersiniabactin这样的 siderophores,是Escherichia coli适应尿液和血液的关键因素,增加尿症风险. 遗传和蛋白质组概况可以帮助识别尿路感染的这些危险因素.
科学领域:
- 微生物学 微生物学
- 传染性疾病 传染性疾病
- 分子生物学分子生物学
背景情况:
- 尿道感染 (UTI) 的严重并发症尿症是由从尿道传播到血液的细菌感染引起的.
- 大肠杆菌是尿路感染和尿道感染的主要致病原体,需要对其致病机制有更深入的了解.
- 铁的获取对细菌的生存和毒性至关重要,特别是在尿液和血液等营养有限的环境中.
研究的目的:
- 调查 siderophores 和铁吸收系统在由大肠杆菌 Escherichia coli 引起的泌尿病发病的作用.
- 为了比较E.大肠杆菌的遗传和蛋白质基因特征,从尿道炎患者与无并发性尿路感染的患者分离出来.
- 为了确定潜在的生物标志物来预测尿路感染患者的尿路感染风险.
主要方法:
- 使用PCR化概况对尿道炎和尿道感染患者的大肠杆菌DNA指纹进行比较分析.
- 青醇S (CAS) 测定和RT-qPCR测试以评估在人工尿液和血液补充介质中的 siderophore 基因表达.
- 在人工尿中培养的大肠杆菌分离物的蛋白质组学分析.
- 在患者血清中量化促炎细胞因子 (IL-2,4,6,8,10,IFN-,TNF-α) 和C反应蛋白 (CRP).
主要成果:
- 菌素,空菌素和yersiniabactin的同时发生在尿路炎症病例中明显更频繁 (P=0.0039),空菌素占主导地位 (P=0.03).
- 与尿路感染菌株相比,尿路感染菌株的大肠杆菌菌株在人工尿中显示出明显的 siderophore 基因表达模式.
- 特定的与铁吸收相关的蛋白质 (例如,EfeO,FepA) 和促炎性标记物 (IL-6,IL-8,IL-10,TNF-alpha,CRP) 与尿路塞psis有关.
结论:
- 铁吸收系统,特别是 siderophore 生产,在大肠杆菌的适应和毒性中起着至关重要的作用,有助于尿病的发展.
- 特定的 siderophores (肠杆菌素,空气杆菌素,yersiniabactin) 和 iha 基因的存在可能作为尿液的风险标志物.
- 对大肠杆菌的遗传和蛋白质基因分析对识别患有尿路感染尿路感染风险较高的个体充满希望.
相关概念视频
01:26Urinary Tract Infection I: Introduction
54
Urinary tract infections (UTIs) impact various parts of the urinary system, including the kidneys, ureters, bladder, and urethra. These infections are generally bacterial, with Escherichia coli being the most common causative agent, often originating from the gastrointestinal tract. However, other bacteria, such as Staphylococcus saprophyticus, Klebsiella pneumoniae, and Proteus mirabilis, are also known to cause UTIs. The type, location, and underlying complexity of the UTI guide both...
54
01:25Urinary Tract Infection II: Pathophysiology
52
The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
52
01:30Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care
48
A healthcare provider can diagnose a urinary tract infection (UTI) through several methods:Medical History and Symptoms: The provider will take a detailed medical history and ask about symptoms such as frequent urination, burning sensation during urination, and lower abdominal pain.Urinalysis: A clean-catch urine sample is collected in a sterile container and tested for the presence of bacteria, white blood cells (leukocytes), nitrites, blood, and protein. The presence of leukocytes and...
48
01:26Urine Studies II: Urine Culture and Sensitivity Test
128
A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
128
01:17Urinary Tract Infection IV: Nursing Management
96
In managing urinary tract infections (UTIs) in nursing, a comprehensive assessment is essential. Begin by gathering subjective data, such as the patient’s complaints of dysuria (painful urination), urinary frequency, urgency, suprapubic pain, and any lower abdominal discomfort. This information can be complemented by questions regarding previous UTIs, sexual activity, and personal hygiene practices, which can provide insight into risk factors. Objective assessment should focus on signs...
96
01:27Acute Pyelonephritis I: Introduction
65
Pyelonephritis is a bacterial infection that primarily affects the renal parenchyma and collecting system, including the renal pelvis, tubules, and interstitial tissue of one or both kidneys. It can be classified as either acute—a sudden, severe infection—or chronic, which refers to long-term or recurrent kidney infections.The primary cause of acute pyelonephritis (APN) is bacterial infection, with Escherichia coli accounting for approximately 70-80% of cases. Other bacteria, such...
65