失调的氨酸代谢驱动炎症和血管生成在多发性糖尿病视网膜病变
Ahmed M Abu El-Asrar1,2, Mohd I Nawaz1, Ajmal Ahmad1
1Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
Frontiers in immunology
|March 6, 2026
概括
异常的氨酸 (HA) 代谢,特别是超低分子量HA (ULMW-HA),在多发性糖尿病视网膜病变 (PDR) 中驱动炎症和血管生成. 这项研究研究了PDR中的HA通路酶和受体,揭示了它们在疾病进展中的作用.
科学领域:
- 眼科医生 眼科 眼科
- 糖尿病视网膜病变研究研究
- 分子生物学分子生物学
背景情况:
- 扩散性糖尿病视网膜病变 (PDR) 是导致失明的主要原因,其特点是炎症和新血管化.
- 氨酸 (HA) 途径,涉及氨酸合成酶 (HAS) - 2和氨酸酶 (Hyal) - 1/2等酶,以及CD44和RHAMM等受体,在细胞过程中发挥着关键作用.
- HA途径的失调与各种病理状况有关,包括糖尿病并发症.
研究的目的:
- 在PDR患者的眼部微环境中研究HA通路组件 (HAS2,Hyal-1,Hyal-2,CD44,RHAMM) 的表达.
- 阐明HA途径在推动PDR病变发生中的炎症和血管生成中的作用.
- 了解HA代谢异常对糖尿病诱导的视网膜内皮功能障碍的贡献.
主要方法:
- 从PDR患者和对照组中分析皮质膜和玻璃体样本,使用免疫组织化学,ELISA和西欧涂抹.
- 涉及老鼠视网膜,视网膜Müller质细胞和人类视网膜微血管内皮细胞 (HRMECs) 的功能研究.
- 评估体内血视网膜屏障完整性,体内细胞粘附和血管生成,使用超低分子量HA (ULMW-HA) 和途径抑制剂进行特定干预.
主要成果:
- 在PDR玻璃体样本中观察到高水平的HA,HAS2,Hyal-1,Hyal-2,CD44和syndecan-1.
- 在视网膜膜中HAS2,Hyal-2,CD44和RHAMM的表达与血管新生活性正相关.
- 在老鼠和穆勒细胞中使用ULMW-HA诱导了炎症和血管原生标志物 (例如VEGF,NF-κB,ERK1/2),而抑制剂则部分扭转了这些影响. ULMW-HA还促进了内皮细胞迁移和单细胞粘附.
结论:
- 异常的HA代谢,特别是ULMW-HA,是糖尿病诱导的视网膜内皮功能障碍的一个关键因素.
- ULMW-HA积极促进炎症和血管生成,对PDR的启动和进展作出重大贡献.
- 针对HA途径,特别是氨基酶活性,可能为PDR提供治疗策略.
更多相关视频
08:10An Ex Vivo Tissue Culture Model for Fibrovascular Complications in Proliferative Diabetic Retinopathy
Published on: January 25, 2019
8.4K
12:28Quantification of Vascular Parameters in Whole Mount Retinas of Mice with Non-Proliferative and Proliferative Retinopathies
Published on: March 12, 2022
4.3K
相关概念视频
Regulation of Angiogenesis and Blood Supply
3.8K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
3.8K
Mechanism of Angiogenesis
7.3K
Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
7.3K
Pathophysiology of Diabetes
4.0K
Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility,...
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility,...
4.0K
