レプチンは,肥満に関連する血圧上昇を媒介する
Stephanie E Simonds1, Jack T Pryor2, Eric Ravussin3
1Department of Physiology, Monash Obesity and Diabetes Institute, Monash University, Clayton, VIC 3800, Australia.
Cell
|December 7, 2014
まとめ
肥満に関連するホルモンであるレプチンは,特定の脳の経路に作用することで,血圧 (BP) を直接上昇させます. この発見は,肥満に関連する心血管疾患のリスクに関する新しい洞察を提供します.
科学分野:
- エンドクリノロジー エンドクリノロジー
- 神経科学は神経科学である.
- 心血管科学 心血管科学
背景:
- 肥満は心臓血管疾患の主な危険因子であり,しばしば高血圧 (BP) に伴います.
- BPの調節における重要な肥満ホルモンであるレプチンの役割は複雑で,完全に理解されていません.
研究 の 目的:
- ダイエット誘発肥満 (DIO) と関連したBP上昇を媒介するレプチンの因果的役割を調査する.
- レプチンがBPに影響を与える神経回路を特定するために.
主な方法:
- レプチン欠乏症およびレプチン受容体欠乏症 (LepR) モデルを含む歯類における食事誘発性肥満 (DIO) を研究した.
- レプチン抗体,アンタゴニスト,および背中中部下垂体 (DMH) の標的ニューロン阻害を活用した.
- DMHにおけるレプチン受容体 (LepRs) が再発現した遺伝子組み換えマウスにおけるBP反応を調べた.
主要な成果:
- DIOネズミにおけるレプチンのレベルは,高血圧と直接相関していた.
- レプチンの欠乏または封鎖は,DIOモデルにおけるBP上昇を防止しました.
- DMHにおけるLepR発現ニューロンを標的にすることで,体重に関係なく,DIOマウスのBPが急速に低下しました.
- DIO LepR欠乏マウスのDMHにおけるLepRの回復はBPを正常化した.
結論:
- 背中中垂体におけるレプチンのシグナル伝達は,肥満と哺乳類の高血圧を結びつける重要なメディエーターである.
- これらの発見は,肥満患者の高血圧管理のための潜在的な治療目標としてレプチンを強調しています.
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