1,25-ジヒドロキシビタミンD3は,内生性副甲状腺ホルモンに関連するペプチドの分泌を調節することにより,血管の化をインビトロで増加させます
1Second Department of Internal Medicine, Osaka City University Medical School, Osaka 545, Japan.
Circulation
|September 30, 1998
まとめ
1alpha,25-dihydroxyvitamin D3 (1,25(OH) 2D3) は,滑らかな筋肉細胞における副甲状腺ホルモン関連ペプチド (PTHrP) を阻害することによって,血管の結石化を促進する. このビタミンDの代謝産物はまた,アルカリ性フォスファタゼとオステオポントンを増加させ,カルシウム堆積に貢献します.
科学分野:
- 心血管生物学 心血管生物学
- エンドクリノロジー エンドクリノロジー
- ミネラルメタボリズム
背景:
- 血管加熱は骨粗鬆症と関連しており,カルシウムホメオスタシスの役割を強調しています.
- 副甲状腺ホルモン関連ペプチド (PTHrP) は,血管の化に影響を与える可能性があります.
- 1alpha,25-dihydroxyvitamin D3 [1,25(OH) 2D3]は,血管の滑らかな筋肉細胞のカルシウム調節に影響を及ぼすと仮定されています.
研究 の 目的:
- 1,25(OH) 2D3が血管の化に及ぼす直接的な効果を in vitroで調査する.
- 1,25(OH) 2D3誘発の血管カルシフィケーションにおけるPTHrPの役割を決定する.
主な方法:
- 牛の血管滑らかな筋肉細胞 (BVSMCs) は,1,25(OH) 2D3.3.の濃度によって異なる治療を受けました.
- 化,アルカリリンフォスファタゼ活性,PTHrP分泌/遺伝子発現を測定した.
- 1,25(OH) 2D3で処理されたBVSMCに対する外因的なPTHrPの効果が評価されました.
- オステオポントンの遺伝子発現を分析した.
主要な成果:
- 1,25 (((OH) 2D3は,BVSMCのカルシフィケーションとアルカリリンフォスファターゼの活性が,用量に依存して増加した.
- 1,25(OH) 2D3は,BVSMCにおけるPTHrPの分泌と遺伝子発現を低下させた.
- 外因的なPTHrPは,1,25(OH) 2D3.3.の化促進効果を阻害した.
- 1,25(OH) 2D3は,BVSMCにおけるオステオポントンの遺伝子発現を増加させた.
結論:
- 1,25(OH) 2D3は,BVSMCにおける内生的なPTHrP発現を阻害することによって,血管の化を刺激する.
- 1,25(OH) 2D3によるアルカリリンフォスファタゼ活性とオステオポントンの発現の増加は,血管の化に寄与する.
- これらの発見は,血管の化を促進するビタミンDの直接的なメカニズムを明らかにしています.
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