痛みの脊髄記憶の痕跡を,短い,高用量のオピオイド投与によって消去する
Ruth Drdla-Schutting1, Justus Benrath, Gabriele Wunderbaldinger
1Department of Neurophysiology, Center for Brain Research, Medical University of Vienna, A-1090 Vienna, Austria.
Science (New York, N.Y.)
|January 17, 2012
まとめ
高用量のオピオイドは,脊髄における痛みに関連するシナプス変化 (長期的増強) を逆転させることができる. この発見は,オピオイドが痛み信号を一時的に軽減するだけでなく,痛みの記憶を消去する可能性があることを示唆しています.
科学分野:
- 神経科学は神経科学である.
- 痛みの研究 痛みの研究
- 薬理学 薬理学とは
背景:
- 脊髄C線維端末におけるシナプス長期増強 (LTP) は,痛みの増幅 (ハイパーアルゲシア) をモデル化している.
- オピオイドアゴニストは通常,C繊維シナプスを抑制し,現在の疼痛治療の基礎を形成します.
研究 の 目的:
- 高用量のオピオイドがC繊維シナプスにおける活動に依存したLTPに及ぼす影響を調査する.
- 確立された痛みの記憶の痕跡を逆転させるためのオピオイドの可能性を調査する.
主な方法:
- 脊髄モデルにおけるC繊維シナプスにおけるLTPの誘導と逆転.
- カルシウム (Ca2+) に依存するシグナル伝達経路の分析.
- アルファ-アミノ-3-ヒドロキシ-5-メチル-4-イソクサゾールプロピオン酸 (AMPA) 受容体のリン酸化の評価.
- ハイパーアルゲシアの逆転を評価するために動物における行動テスト.
主要な成果:
- 短期的な高用量オピオイド投与は,C繊維シナプスにおける活動に依存したLTPを逆転させた.
- LTPの逆転には,Ca2+依存シグナル伝達と正常化されたAMPA受容体のリン酸化が含まれていた.
- このオピオイド誘発の衰弱は,行動する動物における過敏症を逆転させました.
結論:
- オピオイドは,痛みを伴うシナプス可塑性を逆転させ,脱活性を誘発することができます.
- 高用量オピオイドは,一時的な鎮痛を超えて,脊髄痛の記憶を消去するメカニズムを提供することがあります.
- これは,慢性疼痛状態に対する新しい治療戦略を示唆しています.
関連する概念動画
01:15Opioid Analgesics: Synthetic and Semisynthetic Opioids
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...
01:25Analgesia and Pain Management
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...
01:20Pain
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...
01:11Local Anesthetics: Clinical Application as Spinal Anesthesia
Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
01:29Local Anesthetics: Clinical Application as Epidural Anesthesia
Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
01:20Opioid Analgesics: Morphine and Other Natural Cogeners
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...