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Related Concept Videos

Pathophysiology of Heart Failure01:17

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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Related Experiment Video

Updated: Jun 30, 2025

Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes
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Abnormal phosphorylation / dephosphorylation and Ca2+ dysfunction in heart failure.

Yan-Bing Liu1,2, Qian Wang2, Yu-Ling Song3

  • 1Interventional Medical Center, The Affiliated Hospital of Qingdao University, 16 Jiangsu Road, Qingdao, 266003, Shandong Province, China.

Heart Failure Reviews
|March 18, 2024
PubMed
Summary

Heart failure involves abnormal heart muscle function due to altered calcium handling. This review details phosphorylation changes in L-type calcium channels, endoplasmic reticulum, and myofilaments during heart failure progression.

Keywords:
Ca2+Endoplasmic reticulumHeart failureL-type calcium channelPhosphorylation

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Area of Science:

  • Cardiology
  • Molecular Biology
  • Biochemistry

Background:

  • Heart failure (HF) is characterized by impaired myocardial systole and diastole.
  • Calcium (Ca2+) influx via L-type calcium channels (LTCC) initiates the cardiac cycle.
  • HF involves myocardial Ca2+ handling dysfunction, linked to altered protein phosphorylation/dephosphorylation.

Purpose of the Study:

  • To review phosphorylation/dephosphorylation changes in HF progression.
  • To summarize effects on LTCC, ER, and myofilament function in normal and failing hearts.
  • To discuss current and potential therapeutic strategies targeting abnormal phosphorylation.

Main Methods:

  • Literature review of experimental and clinical research.
  • Analysis of phosphorylation/dephosphorylation patterns in HF.
  • Synthesis of data on LTCC, ER, and myofilament regulation.

Main Results:

  • HF is associated with unbalanced phosphorylation/dephosphorylation of LTCC, ER, and myofilaments.
  • Kinase and phosphatase activities shift during HF progression, altering phosphorylation states.
  • Significant differences exist in phosphorylation profiles between normal and failing hearts.

Conclusions:

  • Phosphorylation/dephosphorylation dynamics are critical in HF pathogenesis.
  • Understanding these changes offers insights into HF mechanisms.
  • Targeting abnormal phosphorylation presents a promising therapeutic avenue for HF.