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たこつぼ型心筋症の分子機序の解明 ; Takotsubogata shinkinsho no bunshi kijo no kaimei ; Molecular mechanism of Takotsubo cardiomyopathy

This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

Research team head ; Research team member ; Research team member ; Research team member ; Research team member ; Research team member ; Publisher ; 研究種目 : 基盤研究(A)(一般) 研究期間 : 2012~2014 課題番号 : 24249048 研究分野 : 分子生物学 ; 本研究では痙攣を誘発することによりたこつぼ型心筋症を発症するマウス・ラットモデルを開発し, これを用いて, たこつぼ型心筋症発症のメカニズム解明を目指した。まず逆行性トレーサーにより左室心尖部を支配する交感神経は左側の星状神経節を介して, 中枢は主に視床下部傍室核付近に存在することが明らかとなった。左室心尖部を支配する交感神経の中枢をマイクロサンプリングし, DNAマイクロアレイを用いた解析より同部位がCCL2などにより活性化され, その興奮が末梢に伝達していることが示唆された。さらに, 星状神経節において, ニューロペプタイドY(NPY)の発現が上昇していることが確認された。 Big emotional or physical stress may lead to an imbalance in the brain, resulting in Takotsubo cardiomyopathy (TC), transient left ventricular (LV) apical ballooning. We first confirmed the central neurons of cardiac sympathetic nerves in the hypothalamus innervating the LV apex, and investigated the changes in gene expression in an animal model of TC induced by epilepsy, a clinical trigger of TC. We found that chemokine ligand 2 (Ccl2) strongly stimulated the central neurons of the cardiac sympathetic nerves. Consequent upstream sympathetic activation induced significant upregulation of neuropeptide Y (NPY) in the left stellate ganglion (LSG) and cardiac sympathetic nerves. Administration of Ccl2 into the central neurons evoked TC and increased NPY at LSG. Overall, our results provide the first evidence as to how emotional or physical stress translates into molecular signals in the brain, leading to LV apical ballooning.