関連する実験動画
Updated: Jul 10, 2026

02:26
Intracranial Pharmacotherapy and Pain Assays in Rodents
Published on: April 9, 2019
血脳障壁: 頸動脈注射後にモルヒネ,コデイン,ヘロイン,メタドンの浸透
まとめ
ヘロインは血脳障壁に素早く浸透し,ネズミでは68%の吸収率に達する. このヘロインの急速な脳吸収は,ヘロインの依存性特性を説明するかもしれない.
科学分野:
- 薬理学 薬理学とは
- 神経科学は神経科学である.
- 薬物の代謝について
背景:
- オピオイドの血脳障壁 (BBB) への浸透を理解することは,それらの薬理学的効果と中毒の可能性を説明するために不可欠です.
- 以前の研究では,異なるオピオイド鎮痛剤に対して,BBBの浸透性の度合いが異なることを明らかにした.
研究 の 目的:
- ネズミのモルヒネ,コデイン,ヘロイン,メタドンの脳への吸収を定量化するために.
- 薬物の脳への吸収のための静脈内注射経路と頸動脈内注射経路の関係を調査する.
- 急速にヘロインが脳に浸透し,その中毒性の性質との潜在的な関連性を調査する.
主な方法:
- ラベル付けされたオピオイド薬 (モルヒン,コデイン,ヘロイン,メタドン) は,ネズミの常 carotid 動脈にボラス注射によって投与されました.
- ネズミは注射後15秒で首を切断され,脳に薬物の含有量を測定した.
- 脳による薬物摂取量は,同時に注射された,高度に拡散する基準物質に対する割合として計算された.
主要な成果:
- 脳への吸収割合は,モルヒン (検出不能),コデイン (24%),ヘロイン (68%),メタドン (42%) でした.
- モルヒネとコデインの静脈内注射試験は,大動脈内注射データと良好な相関を示しました.
- コデインの脳への吸収は,静脈内投与後30秒以内にほぼ完了しました.
結論:
- 特定のオピオイド薬,特にヘロインは,非常に速い脳吸収を示し,効率的な血脳壁の浸透を示唆します.
- ヘロインの急速な静脈内吸収は,地域的な脳血流の影響を受けているようです.
- BBBにおけるヘロインの急速な浸透は,ヘロインの高い中毒の可能性に貢献する重要な要因である可能性があります.
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