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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
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Lysosomal Hydrolases

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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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Lysosomes01:31

Lysosomes

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Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

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Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
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Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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関連する実験動画

Updated: Sep 10, 2025

An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity
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リダイフェン誘導体は,その基本的なサイドチェーンに依存して,強力なリソソモトロピク剤として機能する.

Yuta Semba1, Kyoka Komukai2, Eri Murata2

  • 1Division of Life Science and Engineering, College of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-machi, Hiki-gun, Saitama, 350-0394, Japan.

European journal of pharmacology
|August 22, 2025
PubMed
まとめ

リダイフェンB (RID-B) はタモキシフェンの類型であり,ライソソームを中和し,オートファギーを阻害し,癌細胞死を誘発する. このリソソーム機能障害はがん治療における薬剤耐性を克服する 潜在的な戦略を提供します.

キーワード:
抗がん化合物オートファジーリソソモトロピク剤リダイフェン

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科学分野:

  • 細胞生物学
  • 分子腫瘍学
  • 薬物の発見

背景:

  • セルロースホメオスタシスにはオートファギーは不可欠ですが,その不調は化学療法に対する耐性を引き起こす可能性があります.
  • リダフェン (RID) 化合物は,タモキシフェンの類型であり,強力な抗がん作用を示し,オートファギーを調節する.

研究 の 目的:

  • RID化合物の自己死と相互作用を調査し,その細胞毒性に貢献する要因を特定する.
  • RIDの誘導体の癌治療における自己消化に関連する薬剤耐性を克服する可能性を調査する.

主な方法:

  • 異なる基本サイドチェーンを持つRIDデリバティブの合成
  • 細胞活性の評価 (MTTアッセイ),リソソーム pH (フローサイトメトリー),および亜細胞分布 (光染料結合化合物).
  • 免疫ボルトとコンフォカルイメージングによる自滅およびアポプトシスマーカーのモニタリング.

主要な成果:

  • RID-Bはライソソームを効果的に中和し,オートファージ流を阻害し,タンパク質毒性ストレスとアポトーシスを引き起こした.
  • バフィロミシンA1の併用治療でアポトーシスの減少が示されたように,RID-Bによって誘発されたリソソーム機能障害.
  • RID誘導体における基本的なサイドチェーンの数,リソソーム中和,および細胞毒性との間には相関関係が見られた.

結論:

  • ベーシックサイドチェーンは,RID誘導体のリソソモトロピ的振る舞いを強化し,オートファジー抑制とアポトーシスを促進する.
  • リソソーム中和は,RID化合物の強化された細胞毒性の基礎にある重要なメカニズムです.
  • RID-Bのような改造されたタモキシフェン類は,がん治療における自己消化に関連する薬剤耐性を克服するための有望な戦略です.