在急性呼吸窘迫综合征中对表面活性剂特异性蛋白质的损伤
C S Baker1, T W Evans, B J Randle
1Cell Biology Unit, National Heart and Lung Institute, Imperial College School of Medicine, London, UK.
Lancet (London, England)
|April 27, 1999
概括
急性呼吸困扰综合征 (ARDS) 损害了表面活性蛋白,可能是通过中性粒细胞弹性酶. 这种体内损伤可能会限制ARDS患者当前表面活性剂治疗的有效性.
科学领域:
- 肺部医学 肺部医学
- 关键的护理关键的护理
- 生物化学 生物化学
背景情况:
- 急性呼吸窘迫综合征 (ARDS) 是一种严重的疾病,死亡率高,没有特定的治疗方法.
- 在ARDS中中性粒细胞激活导致肺损伤和表面活性剂功能障碍.
- 中性粒细胞弹性酶可以降解表面活性蛋白质,可能限制治疗疗效.
研究的目的:
- 在ARDS患者中调查表面活性剂特异性蛋白质的体内损伤.
- 为了确定中性粒细胞弹性酶是否负责ARDS肺部表面活性蛋白损伤.
主要方法:
- 从18名ARDS患者和6名健康对照者通过支气管膜洗收集了肺表面活性剂样本.
- 使用SDS-PAGE进行了蛋白质分离.
- 西方涂抹用单克隆抗体 (E8) 识别了表面活性剂特异性蛋白A (SP-A).
主要成果:
- 在18名ARDS患者中,有14人表现出SP-A损伤的证据,与对照组不同.
- 损坏的SP-A表现出改变的分子量范围 (55 kDa,30-36 kDa,36-40 kDa) 与对照中的正常二次体 (66 kDa) 相比.
- 观察到的损伤模式类似于中性粒细胞弹性酶在体外分裂的SP-A.
结论:
- 表面活性剂特异性蛋白质在ARDS患者的肺部直接受损,可能是通过蛋白质分解.
- 由于中性粒细胞产物的持续损伤,这可能解释了ARDS患者对治疗表面活性剂的有限反应.
- 结合表面活性剂和抗蛋白酶疗法可以为ARDS提供改善的治疗结果.
相关概念视频
Acute Respiratory Failure-III
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
Drug Toxicity: Allergic Reactions
Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Hypersensitivity Reactions: Cytolytic Reactions
Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
Nephrotic Syndrome I : Introduction
Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of fluid...
Cellular Injury I: Introduction
Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
Acute Pancreatitis II: Pathophysiology
The pathophysiology of acute pancreatitis centers on injury to pancreatic acinar cells, which initiates a cascade of harmful intracellular events.This injury leads to premature activation of trypsinogen to trypsin in the pancreas. Trypsin then activates other digestive enzymes, such as chymotrypsin, elastase, and phospholipase A2, which begin breaking down pancreatic tissue. The resulting autodigestion causes local inflammation, tissue swelling, hemorrhage, and fat necrosis.Injured acinar cells...


