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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
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Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Updated: Feb 4, 2026

Patterning Bioactive Proteins or Peptides on Hydrogel Using Photochemistry for Biological Applications
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微小重力誘発性内皮機能障害に対するタンパク質ナノバイオアクティブ剤

Anisha Kabir1, Mukilarasi B1, Anagha Manohar1

  • 1Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.

NPJ microgravity
|February 2, 2026
PubMed
まとめ

宇宙飛行士は微小重力により宇宙で血管機能障害に直面します。新しいゼインナノケージ治療薬(ZNT)製剤は、シミュレートされた宇宙条件下で酸化ストレスを効果的に戦闘し、心血管系の健康を保護します。

キーワード:
ゼインナノケージ微小重力内皮機能障害酸化ストレス血管新生宇宙医学ナノテクノロジー心血管研究

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科学分野:

  • 宇宙医学
  • ナノテクノロジー
  • 心血管研究

背景:

  • 長期間の宇宙飛行は、酸化ストレスと心臓の脱調を介して宇宙飛行士の血管機能障害を引き起こす微小重力と宇宙放射線への曝露を誘発します。
  • 宇宙飛行誘発性問題に対する現在の治療法は、副作用によって制限され、酸化および内皮損傷に対する有効性が欠如しています。

研究 の 目的:

  • シミュレートされた微小重力下での酸化ストレスの軽減と心血管系の健康保護のための、多機能ゼインナノケージベース治療製剤(ZNT)の開発と評価。

主な方法:

  • 酸化ストレスマーカー、ミトコンドリア機能、DNA損傷、アポトーシス、および血管新生遺伝子発現を評価するために、シミュレートされた微小重力に曝露された内皮細胞を用いたinvitro研究。
  • ZNTの治療効果を確認するためのゼブラフィッシュ幼生およびニワトリ胚モデルを使用したinvivo検証。
  • 酸化ストレスと内皮保護を標的とする治療用カクテルをカプセル化するZNTの製剤化。

主要な成果:

  • 微小重力は、内皮細胞における顕著な活性酸素種生成、ミトコンドリア機能障害、DNA損傷、およびアポトーシスを誘発しました。
  • ZNT治療は、レドックスバランスを効果的に回復させ、ミトコンドリアの完全性を維持し、DNA損傷とアポトーシスを防ぎ、主要な血管新生遺伝子(VEGFA、HIF-1α、eNOS、iNOS、FGF-2、ANG1)の発現を正常化しました。
  • ZNTの保護効果はinvivoで確認され、複雑な生物学的システムにおけるその有効性を示しました。

結論:

  • 多機能ゼインナノケージベース治療製剤(ZNT)は、微小重力誘発性心血管損傷に対抗する上で大きな可能性を示しています。
  • ZNTは、酸化ストレスと病理学的血管新生の両方に対処し、宇宙飛行士のヘルスケアのための新しいナノ治療戦略を提供します。
  • この製剤は、宇宙飛行中および宇宙飛行後の宇宙飛行士の心血管機能保護における重要なギャップを埋める可能性があります。