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相关概念视频

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

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Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

Oxidations of Aldehydes and Ketones to Carboxylic Acids

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Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Author Spotlight: Innovating Thiol Quantification and Biomarker Detection for Oxidative Stress Research
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基于硫醇的氧化还原分子:对烯胺毒性的潜在解剂

Valeria Martin1, Michael Trus1, Daphne Atlas1

  • 1Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Antioxidants (Basel, Switzerland)
|January 8, 2025
PubMed
概括

烯胺 (ACR) 暴露会引起氧化应激,并激活基激活蛋白激酶 (MAPKs). 基于醇的分子,特别是含有更多氨酸残留的氨酸模拟 (TXM) ,有效抑制了ACR诱导的MAPK激活,并显示出作为抗毒剂的希望.

科学领域:

  • 生物化学和分子生物学
  • 毒理学和药理学 毒理学和药理学
  • 神经科学是一个神经科学.

背景情况:

  • 烯胺 (ACR) 是一种无处不在的工业化学品和食品污染物,与氧化应激和神经毒性有关.
  • 由ACR诱导的氧化应激涉及到基激活蛋白激酶 (MAPKs) 的激活,包括ERK1/2,p38MAPK和JNKs.
  • 确定ACR毒性的有效抗剂对于减轻其不良健康影响至关重要.

研究的目的:

  • 为了评估醇基分子作为潜在的抗剂对抗烯胺 (ACR) 毒性的疗效.
  • 研究这些化合物抑制细胞外信号调节激酶 (ERK1/2),p38-mitogen-activated-protein-kinases (p38MAPK) 和c-Jun-N-terminal-kinases (JNKs) 的ACR诱导激活的能力.
  • 探索这些分子在预防ACR触发的帕金森病 (PD) 类神经毒性症状方面的潜力.

主要方法:

  • 在PC12细胞中开发一种可复制的测定方法,用于测试N-乙半氨酸 (NAC),AD4/NACA以及各种类型的硫仿真 (TXM) .
  • 在ACR暴露之前和之后,评估化合物抑制ACR诱导的MAPK激活的疗效.
  • 剂量反应分析以确定化合物结构 (氨酸残留物数量) 和抑制功效之间的相关性.

主要成果:

  • 所有测试的基化合物,包括NAC,AD4/NACA和TXM,都在抑制ACR诱导的MAPK激活方面表现出显著的有效性.
关键词:
在AD4/NACA中使用.灭症 (apoptosis) 是一种死亡的过程.氧化应激是一种氧化应激.铁素还原酶是一种 thioredoxin.毒性的毒性 毒性的毒性

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  • 抑制功效是剂量依赖的,与分子中氨酸 (Cys) 残留物的数量直接相关.
  • 超级多巴 (SD) 是一种含有乐伏多巴和两个Cys残留物的TXM,通过减少氧化应激和补充多巴胺,显示出减轻PD类症状的潜力.

    • 结论:

    • 基分子,特别是TXM,有效抵消ACR诱导的MAPK激活和氧化应激.
    • 半氨酸残留物的数量是这些抗毒剂效力的关键因素.
    • 包括SD在内的TXM,作为治疗急性/慢性ACR暴露和预防ACR诱导的帕金森症的治疗剂具有前景.