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Isolation of Atrial Myocytes from Adult Mice
Published on: July 25, 2019
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ネズミの心房間関節と心房間関節におけるNa+チャネルイソフォームの局所化
Shin Yoo1, Halina Dobrzynski, Vadim V Fedorov
1Cardiovascular Research Group, School of Medicine, University of Manchester, Core Technology Facility, 46 Grafton St, Manchester M13 9NT, United Kingdom.
Circulation
|September 13, 2006
まとめ
この研究では,心房節 (AVN) の異なるナトリウムチャンネル (Na(V)) 発現パターンを明らかにし,複数の電気生理学的細胞タイプを示しています. AV伝導の障害は,AVNの入力または出力の問題から生じる可能性が高く,AVNのコア構造から生じることはありません.
科学分野:
- 心臓電気生理学 心臓電気生理学
- 分子心臓病学 分子心臓病学
- イオンチャネル生物学
背景:
- 心房中枢節 (AVN) は機能的な異質性を示しているが,細胞の基礎と3D構造との関係は不明である.
- AVNの細胞組成を理解することは,その電気的活動と伝導特性を説明するために不可欠です.
研究 の 目的:
- ネズミのAVN内のナトリウムチャネルNa(V) 1.5および他のNa+チャネルイソフォームの発現を調査する.
- AVNの異なる細胞タイプと構造領域とのNa+チャネル分布を相関させる.
主な方法:
- マッソンのトリクロム染色とマーカータンパク質 (コネクシン,デスモプラキン,ANP,HCN4) の免疫ラベルを使用したラットのAVN識別.
- アイソフォーム特異のNa+チャネル抗体による免疫ヒストケミストリーは,Na(V) 1.1,Na(V) 1.2,Na(V) 1.3,Na(V) 1.5およびNa(V) 1.6の分布を決定する.
主要な成果:
- Na(V) 1.5の標識は心房/心室筋と左束の枝に顕著だったが,開いた結節と貫通したAV束にはなかった.
- Na(V) 1.3は神経繊維と細胞体で検出され,穿透性および一般的なAVバンドルに豊富に存在し,他の場所では少ない.
- Na(V) 1.1はNa(V) 1.5と同様の分布を示し,Na(V) 1.2とNa(V) 1.6は検出されなかった.
結論:
- 発見は,AV交差点内の複数の電気生理学的細胞タイプに対する分子証拠を提供します.
- Na(V) 1.5の機能障害によるAV伝導障害は,中央AVNではなく,AVNの入力 (下部ノード拡張,移行領域) または出力 (バンドルブランチ) を含む可能性が高い.
関連する概念動画
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Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
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