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Opioid Analgesics: Synthetic and Semisynthetic Opioids01:15

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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
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Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...
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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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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.
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フェンタニル・リワイアード: 2‐アザスピロ[3.3]ヘプタン・コアはμ‐オピオイド機能を維持する

Arran W Stewart1, Lisa M Eubanks1, Mingliang Lin1

  • 1Department of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States.

ACS medicinal chemistry letters
|February 18, 2026
PubMed
まとめ

研究者らは,呼吸器のリスクを減らすことを目的として,重要な化学グループを置き換えることで,新しいフェンタニルアナログを探索しました. 新しいスパイロアナログは痛みを和らげていたが,呼吸器の抑うつが著しく減少し,より安全なオピオイドのための有望な青写真を提供した.

キーワード:
偏ったアゴニズム.バイオイスステロイドフェンタニルフェンタニルとはポータビリティ ポータビリティ 携帯性μ-オピオイド受容体の受容体

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科学分野:

  • 薬用化学 薬用化学について
  • 薬理学 薬理学とは
  • 神経科学は神経科学である.

背景:

  • フェンタニルは,痛みを和らげるために使用される強力なμ-オピオイド受容体 (MOR) アゴニストです.
  • フェンタニルの主要な制限は,その有意な呼吸器を抑える効果である.
  • 呼吸器の負担が軽減された新しい鎮痛剤の開発は,満たされていない重要な医学的需要です.

研究 の 目的:

  • フェンタニルのピペリジン基を2-アザスピロ[3.3]-ヘプタン基に置き換える効果を調査する.
  • 新型スピロアナログの受容体結合,シグナル伝達,および抗ニオシセプティブ効果を含む薬理学的プロフィールを評価する.
  • スピロアナログの呼吸器効果と薬理学的特性を in vivo で評価する.

主な方法:

  • フェンタニルのピペリジン環を2-アザスピロ[3.3]-ヘプタンに置き換えて新しいスパイロアナログの合成.
  • インビトロ受容体結合測定では,MOR,KOR,およびDORに対する親和性を決定する.
  • β-アレスティン-2の徴募を評価するためのインビトロアッセイ.
  • ネズミのホットプレートとテールフリックテストを用いたインビヴォ・アンチノシセプション研究.
  • マウスにおける静脈内投与後の血清半減期を測定する薬理学研究.
  • マウスにおける全身プレチスモグラフィを用いた in vivo 呼吸機能評価.

主要な成果:

  • スピロアナログはMOR優先結合 (MOR > KOR ≫ DOR) を示し,β-アレスティン-2を誘発しなかった.
  • フルアンチノシセプションは,ホットプレートとテールフリックテストで観察されましたが,フェンタニルと比較して約100倍低い効力があります.
  • この化合物は,マウスでは約27分程度の血清半減期で好ましい薬動性を示した.
  • 投与量依存の呼吸器低下が観察されましたが,高用量でのみ,より広い治療ウィンドウを示しています.

結論:

  • ピペリジンの分子を2-アザスピロ[3.3]-ヘプタンに置き換えると,フェンタニルクラスの抗ノシセプティブ活性が維持され,呼吸器の負荷が軽減されます.
  • この構造的変化は,鎮痛効力を呼吸抑制から切り離し,オピオイド薬剤の重要な境界条件をマッピングします.
  • スパイロアナログは,安全性プロファイルが向上した次世代のオピオイド鎮痛剤の開発に有望なリードを示しています.