在辐射诱导的白内障形成中探索 ангиотензинII和氧化应激:治疗干预的潜力
Vidya P Kumar1, Yali Kong2, Riana Dolland3
1Armed Forces Radiobiology Research Institute, The Uniformed Services University of the Health Sciences, Bethesda, MD 20889, USA.
Antioxidants (Basel, Switzerland)
|October 26, 2024
概括
辐射暴露可以通过增加氧化应激和炎症引起白内障. 向血管新素II (Ang II) 和氧化应激通路可能为辐射诱导白内障 (RICs) 提供新的治疗方法.
科学领域:
- 眼科医生 眼科 眼科
- 辐射生物学 辐射生物学
- 细胞生物学 细胞生物学
背景情况:
- 辐射诱导性白内障 (RICs) 是与电离辐射 (IR) 暴露相关的重大健康问题.
- 了解RIC形成 (RICF) 的机制对于开发有效疗法至关重要.
- 血管素II (Ang II) 在RIC与氧化应激一起发展中的作用尚未完全理解.
研究的目的:
- 调查Ang II和氧化应激在RIC发展中的联合作用.
- 为了阐明Ang II对镜片透明度和细胞功能在IR照射后的影响.
- 探索针对Ang II信号和氧化应激的潜在治疗策略.
主要方法:
- 分析透镜组织中反应性氧物种 (ROS) 生产和氧化损伤标记物的分析.
- 评估Ang II对透镜上皮细胞的炎症反应和亡的影响.
- 评估Ang II类型1受体 (AT1R) 激活及其下游后果.
主要成果:
- 安格II通过激活AT1Rs来加强镜片上皮细胞的氧化应激,从而导致ROS的产生增加.
- 透镜蛋白和脂质的氧化损伤,以及炎症和亡,导致透镜透明度受损.
- Ang II通过其对氧化应激和炎症反应的双重促进,加剧了RIC的发展.
结论:
- Ang II 在加速辐射诱导白内障发展方面发挥着至关重要的作用.
- 同时准Ang II信号传递和氧化应激途径为RICs提供了一个有前途的治疗途径.
- 需要进一步的研究来验证这些预防或逆转RIC的策略.
相关概念视频
01:26Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
394
The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
394
01:25Antihypertensive Drugs: Direct Renin Inhibitors
499
The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
499
01:30Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
485
Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
485
01:46Electron Transport Chain: Complex I and II
12.0K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
12.0K
01:30Antihypertensive Drugs: Angiotensin II Receptor Blockers
592
In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
592