JP4154237B2 - 異痛症および他の種々のタイプの慢性疼痛または幻肢痛を治療するための化合物のペプチドクラスの新規使用 - Google Patents
異痛症および他の種々のタイプの慢性疼痛または幻肢痛を治療するための化合物のペプチドクラスの新規使用 Download PDFInfo
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
本発明は、基礎疾患の性質とは独立しているが、しかし、しばしば神経痛または他の種々のタイプの慢性疼痛または幻肢痛(phantom pain)に関連する主要かつ独特な疼痛症状としての異痛症を治療するために有効な製剤学的調製物を製造するための、式Iに記載の特異的アミノ酸誘導体のグループの新規使用に関する。特に本発明は、基礎疾患の性質とは独立しているが、しばしば神経障害性疼痛または他の種々のタイプの慢性または幻肢痛に関連する主要かつ独特な疼痛症状としての異痛症を治療するために有効な製剤学的調製物を製造するための、ハルコセライド(harkoseride)およびその誘導体の新規使用に関する。
Qは、1〜3個の炭素原子を含有する低分子のアルコキシであり、
Q1は、メチルである]
のもの、または製剤学的に認容性のその塩であり、式Iの化合物のジアステレオマーおよびエナンチオマーも本発明に含まれる。
− 急性疼痛
− 慢性疼痛
− 神経障害性疼痛
急性の臨床的疼痛は、一般的には炎症または柔軟組織障害から生じる。このタイプの疼痛は適応性であり、かつ生物学的に関連する警戒機能を有し、かつ治癒可能であり、かつ既に損傷を受けた体の部分を修復し、妨げられないようにする。保護機能は、障害/炎症した部分ならびに周辺の組織を全ての刺激に対して過敏性にして、いかなる外部刺激との接触も回避することにより達成される。このタイプの臨床的疼痛の基礎となるニューロン機構は、実際によく理解されており、かつ急性の臨床的疼痛の薬理学的制御が可能であり、かつ感覚のタイプおよび伸展に応じて、例えば、非ステロイド抗炎症薬(NSAIDs)からオピオイドを用いることにより有効である。
第一に、求心性侵害受容ニューロンの促進した活性に続く(休止:sleeping)ニューロン(例えば、炎症性の疼痛、癌の疼痛、頭痛、背中の下方の疼痛、内臓の疼痛、片頭痛)の感作、一次求心性侵害受容ニューロンが無傷のままであるが、しかしレセプター活性が変化し、かつ減少した閾値、燃焼速度の増大および自発的活性の開始または増大が一般的に見られる。
第2に、求心性侵害受容ニューロンの異所性活性に続くその軸索の損傷(例えば、末梢および中枢神経障害性の疼痛)、一次求心性ニューロンが損傷されている。このことは、不可逆性の末梢および中枢の生化学的、形態学的かつ機能的変化を導く。従って、(末梢)神経障害は、広くは、(末梢)神経系の疾患として定義される。
異感覚症(誘発されたならびに自発的な異常な感覚)と称される。
1.例1:
ホルマリン試験、ラット
ハルコセライドの著しいかつ用量依存の有効性は、ラットホルマリン試験の遅いフェーズで行うことができる。
例2:
慢性絞縮傷(CCI、Bennett-model)
自発的慢性疼痛、機械的異痛症および熱性痛覚過敏の減少におけるハルコセライドの効果を、末梢神経障害の慢性絞縮傷(CCI)モデルを使用して試験し、in vivo動物モデルで最も特徴付けられたうちの1匹を使用して、末梢神経障害による慢性の疼痛を試験した。このモデルで、ゆるい結紮が座骨神経の周囲に存在した。これが末梢神経の末端部分での著しい、しかし不十分な軸策の損失として明白な軸策膨潤および部分的な求心路遮断を生じる。座骨神経結紮に続いて見られた重要な挙動のうちの1つは、後ろ足をガードすることの現れであり、進行中の自発的慢性疼痛の兆しであると考えられる。この考えの支持は、増大した脊髄神経活性の報告、および顕性末梢刺激の不在下に、脊髄視床路ニューロンおよび視床腹側視床中での増大した自発性神経放出から誘導される。自発性疼痛挙動の出現の他に、熱性痛覚過敏および機械的異痛症を含む幾つかの刺激の異痛症が、CCIの結果、刺激に誘発された疼痛の形で引き起こされる。これらの刺激を誘発した異常な疼痛の発展は、障害を受けた神経領域の外側の部分、障害を受けていない神経により刺激された部分での発生として報告されてきた。
例3
尾振り試験(Tail flick test)、ラット
急性脊髄熱性痛覚における潜在的活性について、尾振り試験を使用することによりハルコセライドを付加的に試験した。急性の熱性脊髄/反射痛覚過敏のこのモデルにおいて、放射熱を、動物の尾の先端から約2cmに加え、かつ引っ込め反応の潜伏時間を痛覚計により自動的に検定し、確定最大刺激時間は、組織損傷を防ぐ。この試験は、薬物の抗侵害受容有効度用のアッセイとして広く使用されており、かつヒトでの急性鎮痛性有効度の大いなる前兆となる。一般的には、オピオイドタイプの純粋な鎮痛薬が最も活性であり、アミトリプチリンのような補助剤も、抗てんかん剤もNSAIDs(非ステロイド性抗炎症薬)も活性はなかった。
例4
ガバペンチンと比較したハルコセライドの抗侵害受容活性
以下に説明する実験で使用されたハルコセライドは、以後SPM927と省略し、かつガバペンチンをGBPと省略する。
対象:
この研究の主な目的は、ゲッシ動物中で、炎症疼痛に関してSPM927およびガバペンチン(GBP)の抗侵害受容活性を評価し、かつそれぞれの薬剤のin vivo効果を相互に比較することであった。
方法:
ラットでのカラゲナンに誘導される機械的痛覚過敏症を、2%カラゲナン懸濁液0.1mlを足底下に注射することにより誘発し、その後にpaw pressure(Randall-Sellito)testにより3時間測定した。
結果:
ラットでのカラゲナンに誘導される機械的痛覚過敏症:結果は以下の表6にまとめられている。
例5
以下の表8と9は、ラットでの神経傷害性疼痛(ヒュング)試験におけるハルコセライド(以後SPM927と称する)、カルバマゼピン(carbamazepine)、レベチラセタム(levetiracetam)、ガバペンチン(gabapentine)およびモルヒネの効果を示している。1グループ当たり8匹のラットを使用した。
Claims (14)
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、Arが非置換のフェニルである、請求項1に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、ハロがフッ素である、請求項1または2に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、Qが1〜3個の炭素原子を含有するアルコキシであり、かつArが非置換のフェニルである、請求項1から3までのいずれか1項に記載の化合物の使用。
- 耳鳴りを治療するための製剤学的組成物を製造するための、請求項1から4までのいずれか1項に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、実質的にエナンチオ純粋である請求項6に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、Arが非置換フェニルである請求項6または7に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、ハロがフッ素である請求項6から8までのいずれか1項に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、Qが1〜3個の炭素原子を含有する低分子量のアルコキシであり、かつArが非置換のフェニルである請求項6から9までのいずれか1項に記載の化合物の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための(R)−2−アセタミド−N−ベンジル−3−メトキシプロピオンアミドまたはその製剤学的に認容性の塩の使用。
- 基礎疾患の性質とは独立の主要かつ独特な疼痛症状としての異痛症、または他の種々のタイプの慢性疼痛または幻肢痛を治療するための製剤学的組成物を製造するための、実質的にエナンチオ純粋である請求項11に記載の化合物の使用。
- 耳鳴りを治療するための製剤学的組成物を製造するための、請求項6から12までのいずれか1項に記載の化合物の使用。
- 請求項1から13までのいずれか1項に記載の化合物の抗異痛症に有効な量およびその製剤学的キャリアーを有する製剤学的組成物。
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EP01107026A EP1243263B1 (en) | 2001-03-21 | 2001-03-21 | Novel use of a peptide class of compound for treating allodynia or other different types of chronic or phantom pain |
PCT/EP2002/003032 WO2002074297A1 (en) | 2001-03-21 | 2002-03-19 | Novel use of a peptide class of compound for treating allodynia or other different types of chronic or phantom pain |
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