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Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Cardiomyopathy IV: Restrictive Cardiomyopathy

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Cardiomyopathy III: Hypertrophic Cardiomyopathy

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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  1. ホーム
  2. Jmjd4は,心筋細胞におけるpkm2の分解を促進し,拡張心筋病に対する保護作用を有する.
  1. ホーム
  2. Jmjd4は,心筋細胞におけるpkm2の分解を促進し,拡張心筋病に対する保護作用を有する.

関連する実験動画

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Jmjd4は,心筋細胞におけるPkm2の分解を促進し,拡張心筋病に対する保護作用を有する.

Yansong Tang1, Mengying Feng2, Yang Su1

  • 1Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, China (Y.T., Y.S., T.M., Y.X., D.X.).

Circulation
|April 17, 2023

PubMed で要約を見る

まとめ
この要約は機械生成です。

JMJD4タンパク質欠乏症は,Pkm2の蓄積により,心臓の代謝を損なうことで,拡張性心筋病 (DCM) を引き起こします. JMJD4とPkm2をターゲットにすることで,DCMおよび関連する心臓疾患の治療戦略が提供されます.

キーワード:
HSP70熱ショックタンパク質マウスのJMJD4タンパク質Pkm2 タンパク質心筋病 拡張性シェーパロン媒介による自動食死水酸化マウス

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科学分野:

  • 心血管生物学
  • 分子代謝
  • エピジェネティクス

背景:

  • 拡張性心筋病 (DCM) の病原性は不明であり,多くの症例では遺伝的原因が特定されていません.
  • 代謝ストレスに対する 細胞の反応の変化が DCM に関わっている.
  • 心血管疾患に関与するJMJDファミリータンパク質のDCMにおける役割は不明である.

研究 の 目的:

  • DCMの発達におけるJMJD4の役割を調査する.
  • JMJD4が心臓の代謝と高縮に影響を与える分子メカニズムを解明する.

主な方法:

  • DCM患者におけるJMJD4発現を調べた.
  • 心筋細胞におけるJMJD4の条件付きノックアウトと過剰表現モデルを使用した.
  • RNAシーケンシング,メタボライトプロファイリング,質量スペクトロメトリーを使用した.

主要な成果:

  • JMJD4の発現はDCMの心臓において著しく低下している.
  • JMJD4欠乏症は,ミトコンドリア呼吸機能の障害によるDCMを引き起こします.
  • JMJD4は,Pkm2をチャペロン媒介の自己消化によって分解し,その蓄積を防止します.

結論:

  • JMJD4はPkm2を分解して心臓のメタボリックホメオスタシスを維持する.
  • JMJD4とPkm2は,DCMと心臓代謝機能障害の潜在的治療標的である.