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Analgesia and Pain Management01:25

Analgesia and Pain Management

552
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...
552
Opioid Receptors: Overview01:22

Opioid Receptors: Overview

589
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,...
589
Opioid Analgesics: Synthetic and Semisynthetic Opioids01:15

Opioid Analgesics: Synthetic and Semisynthetic Opioids

251
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...
251
Nociception01:44

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Pain01:20

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471
Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
471
Opioid Analgesics: Morphine and Other Natural Cogeners01:20

Opioid Analgesics: Morphine and Other Natural Cogeners

192
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...
192

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モルヒンに反応する神経細胞が,機械的反発感を調節する

Michael P Fatt1, Ming-Dong Zhang1, Jussi Kupari1

  • 1Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 65 Stockholm, Sweden.

Science (New York, N.Y.)
|August 29, 2024
PubMed
まとめ
この要約は機械生成です。

研究者達はマウスの脳の特定の回路が 痛みの知覚を制御していることを発見しました この回路は脳由来神経栄養因子 (BDNF) を含んでおり モルフィンのようなオピオイドが 機械的な痛みを軽減する方法を説明しています

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科学分野:

  • 神経科学
  • 薬理学について
  • 痛みに関する研究

背景:

  • オピオイドは効果的な鎮痛剤ですが,痛みを和らげるための正確なメカニズムは完全に理解されていません.
  • オピオイドの乱用は流行のレベルに達し,その作用をより深く理解する必要がある.
  • オピオイドによる鎮痛の神経解剖学的根拠については,さらなる解明が必要である.

研究 の 目的:

  • オピオイドによる痛みの軽減に 責任がある神経回路を特定する
  • ロストラル・ベントロメディアル・メドウラ (RVM) のニューロンの機械的知覚における役割を調査する.
  • オピオイドの鎮痛に 基づく分子メカニズムの解明

主な方法:

  • ニューロンの遺伝子発現を分析するために単細胞トランスクリプトミクスを用いた.
  • RVMにおける特定のニューロン集団の操作が行われました.
  • モルヒネ誘発の反発はマウスモデルで評価された.

主要な成果:

  • RVMのニューロンの集合体は,機械的知覚を調節するために重要であると特定されました.
  • RVMBDNF プロジェクションニューロンの活性化や静止は モルフィンの痛みを和らげる効果に直接影響を与えました
  • 脳由来神経栄養因子 (BDNF) / トロポミオシン受容体キナーゼB (TrkB) 経路と脊髄ガランリンニューロンが関与していた.

結論:

  • 特定のRVM-脊髄回路が 機械的な痛みの知覚を調節します
  • この回路はモルヒンの 抗発覚効果を媒介する.
  • この回路を理解することで ターゲットを絞った痛みの管理戦略を 開発する可能性を秘めています