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Related Concept Videos

Myocarditis I: Introduction01:21

Myocarditis I: Introduction

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Cardiomyopathy I: Introduction and Classification01:25

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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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Structure of Cardiac Muscles01:13

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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
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Cardiomyocytes Cellular Phenotypes After Myocardial Infarction.

Alessandra Maria Lodrini1, Marie-José Goumans1

  • 1Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, Netherlands.

Frontiers in Cardiovascular Medicine
|November 25, 2021
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Summary

Acute myocardial infarction (MI) causes significant mortality. Targeting cellular processes like senescence and inflammation in the infarcted heart offers new therapeutic avenues for cardiac repair and improved heart function.

Keywords:
apoptosisautophagycardioprotectiondedifferentiationinflammationmyocardial infarctionsenescence

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Area of Science:

  • Cardiovascular Research
  • Cellular Biology
  • Regenerative Medicine

Background:

  • Acute myocardial infarction (MI) leads to substantial mortality despite reperfusion therapies.
  • Ischemia causes adverse cardiac remodeling, cell death, and limited regenerative capacity in the adult mammalian heart.
  • Cellular phenotypes beyond apoptosis, including senescence, inflammation, and dedifferentiation, are critical in the infarcted heart.

Purpose of the Study:

  • To review cellular phenotypes and pathways involved in myocardial injury, remodeling, and regeneration post-MI.
  • To discuss the implications of complex pathophysiological attributes for designing novel therapeutic strategies.
  • To explore potential treatments targeting cellular processes to enhance cardiac function.

Main Methods:

  • Review of current scientific literature on myocardial infarction pathophysiology.
  • Analysis of cellular phenotypes such as senescence, inflammation, and dedifferentiation in ischemic myocardium.
  • Discussion of potential therapeutic interventions including senolytics and autophagy upregulation.

Main Results:

  • Cardiomyocytes in the infarct border zone can dedifferentiate or become senescent, producing pro-inflammatory secretomes.
  • Senescence, inflammation, and dedifferentiation are key cellular players in the infarcted heart.
  • Enhancing cardiomyocyte electric coupling and upregulating cardioprotective processes like autophagy are potential strategies.

Conclusions:

  • Targeting specific cellular phenotypes like senescence and inflammation presents a promising therapeutic approach for MI.
  • Interventions aimed at improving cardiomyocyte survival, function, and electrical coupling could enhance cardiac contractility post-MI.
  • Understanding the intricate pathophysiology of the infarcted heart is crucial for developing effective regenerative therapies.