肺表面活性剂降低金黄色葡萄球菌的细胞毒性,并保护宿主免疫细胞免受膜损伤
Maria Predtechenskaya1, Corbin J Arbizzani1, Sofia R Shomento2
1Department of Microbiology & Cell Biology, Montana State University, Bozeman, Montana, USA.
Microbiology spectrum
|April 16, 2025
概括
肺部表面活性剂,特别是来自动物的自然表面活性剂,可以减少黄金葡萄球菌 (S. aureus) 毒素对人体细胞的破坏. 天然表面活性剂抑制S. aureus病毒性基因表达,提供一种新的宿主防御机制来抵抗肺部感染.
科学领域:
- 微生物学和免疫学
- 宿主-病原体相互作用
- 肺部医学 肺部医学
背景情况:
- 金黄色葡萄球菌 (S. aureus) 产生毒素,导致显著的膜损伤和细胞毒性.
- 肺表面活性剂对于维持肺功能至关重要,但它们在调节细菌毒性方面的作用不太清楚.
- 由SaeR/S系统调节的S. aureus毒性因子是导致肺部感染的关键因素.
研究的目的:
- 调查自然和商业肺表面活性剂对黄金菌损伤膜毒素的影响.
- 为了确定表面活性剂对S. aureus病毒性基因表达的影响.
- 阐明表面活性剂在宿主防御S. aureus肺部感染中的作用.
主要方法:
- 人类初级细胞 (中性粒细胞,PBMCs) 暴露于S. aureus超生物.
- 用自然 (老鼠,老鼠) 和商业 (Infasurf) 表面活性剂培养或不培养金黄色菌.
- 定量基因表达分析 (qRT-PCR) 的黄金色杆菌病毒性基因 (saeR,lukF-PV,hla,hlgA).
主要成果:
- 来自小鼠和老鼠的天然表面活性剂显著降低了S. aureus毒素对人类细胞的细胞毒性.
- 鼠和小鼠表面活性剂降低了S. aureus病毒性基因的表达,包括saeR,lukF-PV,hla和hlgA.
- 商用Infasurf没有表现出与天然表面活性剂相同的保护作用或对毒性基因表达的影响.
结论:
- 天然的肺表面活性剂通过抑制细菌毒性因子的产生来防止S. aureus介导的膜损伤.
- 自然表面活性剂对SAER/S调节基因的下调代表了一种新的宿主防御机制.
- 这些发现凸显了天然表面活性成分在调节黄金色杆菌肺部感染中的重要性,并建议了潜在的治疗途径.
相关概念视频
Breathing
56.5K
The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
56.5K
Factors Affecting Pulmonary Ventilation
986
Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
986
Surface Tension of Fluid
175
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
175
External and Internal Respiration
2.9K
External respiration occurs in the lungs, and it is the first step in the journey of oxygen inside the body. When we inhale, oxygen enters our lungs and diffuses across the thin alveolar membrane. The alveoli are tiny, air-filled sacs that provide a vast surface area for gas exchange. Oxygen in the alveoli has a higher partial pressure (105 mmHg) than in the adjacent pulmonary capillaries (40 mmHg), establishing a pressure gradient. As a result, oxygen molecules move from the alveoli into the...
2.9K
Pulmonary Cycle: Exhalation
1.3K
In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
1.3K
Surface Tension and Surface Energy
1.3K
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
1.3K


