Endotoxin, Neutrophil Function and Albumin in Renal Insufficiency
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 239
- 试验地点
- 1
- 主要终点
- Endotoxin levels (EU/ml and qualitative positive/negative)
研究概览
简要总结
Chronic kidney disease is widespread in the western world with bacterial infection and sepsis as common complication. It has been shown that innate immune defence, represented by dysfunction of neutrophil granulocytes, is impaired in chronic kidney disease. Another impact of chronic kidney disease on innate immunity is the chronic activation of neutrophils leading to high levels of inflammatory cytokines, thus contributing to protein oxidation. Oxidation of human serum albumin (HSA), the major plasma protein, occurs in chronic kidney disease and leads to further activation of neutrophils. Another important impact of HSA oxidation is the decrease of its binding capacity leading to impaired detoxification ability of albumin. This includes reduced clearance of endotoxin, a major component of the gram negative bacterial cell wall. Circulating endotoxin is recognized by complex formation with lipopolysaccharide binding protein (LBP) followed by binding to CD14 and toll-like receptor (TLR) 4. High systemic endotoxin levels occur in chronic kidney disease and may be the result of decreased clearance ability of HSA and increased gut permeability in combination with intestinal bacterial overgrowth. High systemic endotoxin is associated with worse outcome in several diseases and could be used as predictor for mortality in chronic kidney disease patients.
Endotoxemia in renal insufficiency leads to impaired neutrophil function and to increased albumin oxidation. Oxidized albumin is not able to bind endotoxin adequately any more, which leads to a further increase in oxidative stress and neutrophil dysfunction, resulting in a vicious cycle.
195 patients with renal dysfunction will be enrolled and divided into 5 groups. Additionally, samples of 25 age and sex-matched healthy controls will be collected.
This concept will change the understanding of several aspects of chronic kidney disease and will potentially help to stratify patients into different groups at risk according to their endotoxin status, and their immune and albumin dysfunction. The results of this study will have important implications into the development of novel therapeutic strategies
详细描述
Laboratory methods Endotoxin will be detected by an adapted limulus amoebocyte lysate assay. LBP and sCD14 will be determined by means of ELISA. HPLC will be used to determine nitrate, nitrite, albumin fractions, albumin binding capacity, iNOS expression and energy status of neutrophils. For investigation of oxidation driven by leukocyte derived myeloperoxidase, mass spectrometry analysis will be used. Carbonyl contents of proteins will be detected by ELISA. Neutrophil function and TLR2, 4 and 9 expression will be studied by flow cytometrical analysis. For cell culture tests, freshly isolated neutrophils or differentiated HL60 cells will be used and incubated with albumin and/or endotoxin. Stool samples will be used for 16srDNA sequencing of the gut microbiome.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age between 18-80 years, informed consent Groups 1a, 1b, 2a, 2b, 3a, 3b Patients with chronic kidney disease as defined previously [65] either
- •1a) with an eGFR between 30 and 45 (KDIGO 3B)
- •b) with an eGFR between 15 and 30 (KDIGO 4)
- •a) undergoing hemodialysis for ESRD
- •2b) undergoing hemodiafiltration for ESRD
- •3a) undergoing peritoneal dialysis for ESRD without signs of infection
- •3b) undergoing peritoneal dialysis for ESRD with peritonitis ≥2 out of the 4 criteria (>100 leucocytes/50%neutrophils, cloudy peritoneal dialysate, typical clinical presentation with fever and abdominal pain, positive culture from the peritoneal dialysate)
- •Group 4 Patients with acute kidney injury (AKIN 3 [66] defined as an increase in serum creatinine to 300% (3-fold) from baseline or serum creatinine 4.0 mg/dl with an acute rise of at least 0.5mg/dl or urine output of < 0.3ml/kg/h 24h or anuria 12h) Initiation of acute renal replacement therapy
- •Group 5 Stable patients after kidney transplantation with either an eGFR > 45, between 30 and 45 or < 30
- •Group 6: Healthy controls
排除标准
- •Malignancy, pregnancy,chronic inflammatory bowel disease, celiac disease, active alcohol abuse, any severe organ dysfunction unrelated to renal dysfunction Groups 1a, 1b, 2a, 2b, 3 Organ transplantation Clinical evidence of active infection (except for group 3b) Treatment with antibiotics within the last 2 weeks (except for group 3b)
- •Group 4 Preexisting ESRD
- •Group 5 Clinical evidence of active infection Treatment with antibiotics within the last 2 weeks
- •Any evidence of acute or chronic disease
结局指标
主要结局
Endotoxin levels (EU/ml and qualitative positive/negative)
时间窗: Day 0
Percentage of patients with measurable endotoxin serum levels in each group.
次要结局
- albumin oxidation (%), albumin binding capacity (ratio), neutrophil function (%),(Day 0)
- microbiome composition(Day 0)
研究者
Vanessa Stadlbauer-Koellner, MD
PD. Dr. med
Medical University of Graz