Related Experiment Video
Updated: Jun 12, 2026
08:42
Isolation, Culture and Transduction of Adult Mouse Cardiomyocytes
Published on: August 28, 2016
Cardiomyogenesis in the adult human heart
Jan Kajstura1, Konrad Urbanek, Shira Perl
1Department of Anesthesia and Medicine, and Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115, USA. jkajstura@partners.org
Circulation Research
|June 5, 2010
Summary
The human heart can regenerate significant numbers of myocytes and other cardiac cells throughout life. This study demonstrates substantial myocyte renewal, indicating a robust growth reserve in the adult heart.
Area of Science:
- Cardiovascular Biology
- Cellular Regeneration
- Cardiac Histology
Background:
- The capacity for human heart muscle cell (myocyte) regeneration is a subject of ongoing scientific debate.
- Estimates of myocyte renewal range widely, from negligible to nearly 20% annually.
Purpose of the Study:
- To quantify myocyte, endothelial cell, and fibroblast renewal in the adult human heart.
- To investigate the roles of DNA repair, polyploidy, and cell fusion in myocyte regeneration measurements.
Main Methods:
- Utilized iododeoxyuridine labeling in postmortem cardiac samples from cancer patients.
- Employed confocal microscopy and flow cytometry to assess cell populations and DNA content.
- Analyzed the expression of senescence markers in newly formed cardiac cells.
Main Results:
- Significant myocyte renewal was observed, with an average of 22% generated annually.
- Fibroblasts and endothelial cells also exhibited substantial turnover rates.
- Newly generated cardiac cells displayed mature phenotypes without senescence markers; DNA repair, polyploidy, and fusion were not significant factors.
Conclusions:
- The human heart possesses a considerable growth potential, capable of replacing its cellular components multiple times.
- These findings challenge previous notions of limited cardiac regeneration and highlight the dynamic nature of the adult heart.
Related Concept Videos
01:13Structure of Cardiac Muscles
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...
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
01:27Development of the Heart
The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
01:25Cardiomyopathy I: Introduction and Classification
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...
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
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...
01:27Specialized Characteristics of Cardiac Muscles
The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
01:30Cardiomyopathy II: Dilated Cardiomyopathy
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,...