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相关概念视频

Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

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 hydroxylase and factor...
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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
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Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
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相关实验视频

Updated: May 11, 2026

Two-photon Imaging of Intracellular Ca2+ Handling and Nitric Oxide Production in Endothelial and Smooth Muscle Cells of an Isolated Rat Aorta
08:08

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血红素A2通过它对可诱导的氧化合成酶表达的抑制作用来调节血管度.

Takehiro Yamada1, Takayuki Fujino, Koh-ichi Yuhki

  • 1Department of Pharmacology, Asahikawa Medical College, Midorigaoka-Higashi 2-1-1-1, Asahikawa 078-8510, Japan.

Circulation
|October 15, 2003
PubMed
概括
此摘要是机器生成的。

血红素A2 (TXA2) 通过抑制可诱导的NO合成酶 (iNOS) 产生的氧化 (NO) 产生,从而防止败血症诱导的血管过敏反应. 这种TXA2对iNOS-NO系统的作用对于在败血症期间维持血管功能至关重要.

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相关实验视频

Last Updated: May 11, 2026

Two-photon Imaging of Intracellular Ca2+ Handling and Nitric Oxide Production in Endothelial and Smooth Muscle Cells of an Isolated Rat Aorta
08:08

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科学领域:

  • 血管生物学 血管生物学
  • 败血症病理生理学病理生理学
  • 氧化信号传输 氧化信号传输

背景情况:

  • 败血症引起的循环衰竭与血管反应过低有关.
  • 诱导性氧化合成酶 (iNOS) 和其产物氧化 (NO) 是这种低反应的关键因素.
  • 在这种情况下,血栓素A2 (TXA2) 与iNOS-NO系统之间的相互作用尚不清楚.

研究的目的:

  • 调查TXA2在败血症期间血管过敏反应中的作用.
  • 为了阐明TXA2与iNOS-NO系统之间的交叉通话.
  • 为了确定TXA2是否调节iNOS表达和NO产生.

主要方法:

  • 从野生型和TXA2受体淘汰 (TP-/-) 小鼠的血管光滑肌细胞 (VSMC) 中检查了细胞因子诱导的iNOS表达和NO产生.
  • 在野生类型和TP-/-小鼠中评估了细胞因子诱导的大动脉低响应性和NO生产.
  • 在各种实验环境中使用了TXA2激动剂 (U-46619) 和INOS抑制剂 (aminoguanidine).
  • 在体内评估脂聚糖诱导的NO产量.

主要成果:

  • 内源性TXA2抑制了细胞因子诱导的iNOS表达和VSMC中的NO生产.
  • 一种TXA2激动剂抑制了野生型VSMC中的iNOS表达和NO生产,但不是TP-/-VSMC.
  • 在TP-/-小鼠中,大动脉对利的低反应性明显大于野生型小鼠,并被INOS抑制剂减弱.
  • 与野生型主动脉相比,TP-/-主动脉的细胞因子诱导的NO产量更高.
  • 在体内,U-46619仅在野生类型小鼠中减少了脂聚糖诱导的NO产量.

结论:

  • TXA2对与败血症相关的血管过敏反应具有保护作用.
  • 这种保护作用是通过抑制iNOS-NO系统来实现的.
  • 准TXA2通路可能是治疗治疗败血症引起的血管功能障碍的治疗策略.