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Updated: Aug 19, 2026
Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
Published on: March 26, 2015
Cell proliferation in the growing human heart: MIB-1 immunostaining in preterm and term infants at autopsy
Y Huttenbach1, M L Ostrowski, D Thaller
1Department of Pathology, Baylor College of Medicine, One Baylor Plaza, 77030, Houston, TX, USA. phuttenb@juno.com
Insights
Human cardiac myocyte proliferation decreases after the preterm period. Adult heart cells do not proliferate, aligning with animal model findings.
Area of Science:
- Cardiology
- Developmental Biology
- Cell Biology
Background:
- Human cardiac myocyte proliferation studies in the perinatal period are limited.
- Understanding cardiomyocyte cell division is crucial for cardiac development and repair.
Purpose of the Study:
- To quantify human left ventricular myocyte proliferative activity during the perinatal period.
- To compare proliferation rates across different developmental stages from fetal to adult.
Main Methods:
- Utilized autopsy-obtained cardiac tissue from surgically induced abortuses, preterm infants, term infants, and adults.
- Assessed myocyte proliferation using MIB-1 monoclonal antibody against Ki-67 nuclear antigen.
- Quantified proliferative activity via light microscopy and a staining index (SI) based on positive myocyte nuclei.
Main Results:
- Myocyte proliferative activity remained stable in early preterm infants.
- A decline in proliferation was observed in late preterm and early postterm infants.
- No significant myocyte proliferative activity was detected in adult hearts.
Conclusions:
- Human cardiac myocyte proliferation is a dynamic process, primarily active during the perinatal period.
- The observed proliferation pattern in humans mirrors findings from animal models.
- This study provides key insights into the developmental trajectory of cardiomyocyte cell division.
Abstract:
Few studies of human cardiac myocyte proliferation in the perinatal period have been conducted. We measured the proliferative activity of left ventricular myocytes in tissue obtained at autopsy in three surgically induced abortuses, 20 preterm infants with gestational ages ranging from 12 to 35 weeks, eight term infants with ages ranging from 1 day to 11 months, and five adults. The preterm infants lived less than 24 h, thus simulating the in utero condition of developing hearts. To assess the proliferative activity of the myocytes, we measured immunoreactivity using the monoclonal antibody MIB-1 against the recombinant Ki-67 nuclear antigen. Immunostained sections were examined by light microscopy, and the results expressed as a staining index (SI) of 0-3, according to the percentage of positively stained myocyte nuclei. Myocyte proliferative activity remained constant during the early preterm period and decreased in the late preterm and early postterm periods. Adult myocytes, regardless of cardiac weight, did not reveal proliferative activity as assessed by immunostaining. This proliferation pattern is consistent with findings in most earlier studies in animal models.
