Role of Exosomes Derived From Epicardial Fat in Atrial Fibrillation
试验速览
- 阶段
- 不适用
- 入组人数
- 35
- 试验地点
- 2
- 主要终点
- Exosomes quantity excreted from the epicardial fat (nm)
研究概览
简要总结
Exosome plays an important role in the pathophysiology of the cardiovascular system. Since the field of cardiovascular exosome is still in its infancy, there are no available data regarding to its role in cardiac arrhythmias. The current study investigates the role of epicardial fat derived exosomes in patients who suffer from atrial fibrillation.
详细描述
Myocardial cells communication is mediated via direct cell to cell contact, cell to matrix interaction, long-range signals, electrical signals, and via extracellular chemical molecules (such as proteins, nucleotides, lipids and short peptides). Cell to cell communication can be achieved through direct contact (i.e. Gap junction, cell surface protein/protein interaction) or via secreted signaling molecules (i.e. hormones, neurotransmitters, cytokines). In the last few decades, a third intercellular communication mechanism has gained intense attention - extracellular vesicles that include: (1) apoptotic vesicles (1000-4000 nm), (2) microvesicles (100 nm - 1000 nm), and the smallest extracellular vesicles (3) exosomes (40-100 nm).
The exosomes are produced through the endosomal pathway and are able to carry cargo and transfer them to recipient cells, thus contributing to cell-to-cell communication. The exosomes cargo includes protein content, rRNA, tRNA, short DNA sequences, messenger RNA (mRNA) and microRNA (miRNA). The last two can change the gene expression within the target cells and by that affect myocardial cells.
Nowadays, it is known that in the cardiovascular system, exosome plays important roles in the pathophysiology of myocardial infarction (MI) and as an indicator for the damage and repair mechanisms post-acute MI (i.e. miR-126), in myocardial remodeling, and cardiac regeneration.
Since the field of cardiovascular exosome is still in its infancy, there are no available data regarding to its role in cardiac arrhythmias. Therefore, there is place to investigate the role of exosomes in patients who suffer from atrial fibrillation.
Some of the important issues to explore are: (1) Do the epicardial fat in patients with atrial fibrillation release quantitatively and qualitatively different exosomes than in patients without atrial fibrillation? (2) Can epicardial fat exosomes be a clinical biomarker for arrhythmias? (3) Can these exosomes be a target for the treatment and prevention of arrhythmias?
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Parallel
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Age ≥ 18 years
- •Undergoing an elective cardiac surgery
排除标准
- •Undergoing a non-elective surgery
- •Suffering from severe renal impairment prior to surgery (creatinine clearance <30 mL/min)
- •Experienced hepatic dysfunction other than mild
结局指标
主要结局
Exosomes quantity excreted from the epicardial fat (nm)
时间窗: 9 days
The differences in the quantity of exosomes derived epicardial fat in patients with and without atrial fibrillation. The exosome isolation will be done by using ultra centrifuge for cells and cells debris removal. Then the exosomes will examined by the Malvern NanoSight device both for particle size and concentration measurement.
次要结局
- Inflammatory cytokines secretion from epicardial fat(9 days)
研究者
Dr. Eilon Ram
Resident in cardiac surgery, Principal Investigator
Sheba Medical Center