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Related Concept Videos

Myocarditis I: Introduction01:21

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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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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.
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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Related Experiment Video

Updated: Jan 9, 2026

Ultrasound-Guided Induced Pluripotent Stem Cell-Derived Cardiomyocyte Implantation in Myocardial Infarcted Mice
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Human Hearts Intrinsically Increase Cardiomyocyte Mitosis After Myocardial Infarction.

Robert D Hume1,2,3, Jessica Warwick1,2, Woo Jun Shim4

  • 1School of Medical Sciences, Faculty of Medicine and Health (R.D.H., J.W., C.M., L.S., D.H., E.S., X.W., L.N., L.C., A.L.F., M.L., S.L.), University of Sydney, Sydney, New South Wales, Australia.

Circulation Research
|December 4, 2025
PubMed
Summary

Adult human heart cells (cardiomyocytes) can divide after a heart attack (myocardial infarction). This finding offers hope for developing new treatments to regenerate heart tissue and reverse heart failure.

Keywords:
heartischemiamitosismyocardial infarctionmyocytes, cardiacregeneration

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Area of Science:

  • Cardiovascular Biology
  • Regenerative Medicine
  • Cardiac Physiology

Background:

  • Myocardial infarction (MI) is a major global cause of death, leading to significant loss of cardiomyocytes.
  • Cardiomyocytes typically cease cell division after birth, unlike in some animal models where they proliferate post-MI.
  • The capacity for human cardiomyocyte mitosis following MI has remained largely uncharacterized.

Purpose of the Study:

  • To investigate the potential for cardiomyocyte cell division in adult humans after myocardial infarction.
  • To explore the intrinsic regenerative capacity of the human heart post-ischemia.

Main Methods:

  • Utilized a unique premortem post-MI human heart sample.
  • Employed a combination of techniques including immunostaining, bulk and single-nucleus RNA sequencing, proteomics, and metabolomics.
  • Developed and applied a novel post-MI human biopsy method for cardiomyocyte analysis.

Main Results:

  • Demonstrated that adult human cardiomyocytes exhibit increased mitosis in response to ischemia.
  • Confirmed the occurrence of cytokinesis in human cardiomyocytes following myocardial infarction.

Conclusions:

  • Adult human cardiomyocytes possess an intrinsic ability to undergo mitosis and cytokinesis after ischemic injury.
  • Therapeutic strategies aimed at enhancing this innate mitotic potential could pave the way for cardiac regeneration and heart failure reversal.