Cardiomyocytes undergo cells division following myocardial infarction is a spatially and temporally restricted event in rats

Shinsuke Yuasa, Keiichi Fukuda, Yuichi Tomita, Jun Fujita, Masaki Ieda, Satoko Tahara, Yuji Itabashi, Takashi Yagi, Haruko Kawaguchi, Yasuyo Hisaka, Satoshi Ogawa

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Abstract

Dividing cardiomyocytes are observed in autopsied human hearts following recent myocardial infarction, however there is a lack of information in the literature on the division of these cells. In this study we used a rat model to investigate how and when adult mammalian cardiomyocytes proliferate by cell division after myocardial infarction. Myocardial infarction was induced in Wistar rats by ligation of the left coronary artery. The rats were sacrificed periodically up to 28 days following induced myocardial infarction, and the hearts subjected to microscopic investigation. Cardiomyocytes entering the cell cycle were assayed by observation of nuclear morphology and measuring expression of Ki-67, a proliferating cell marker. Ki-67 positive cardiomyocytes and dividing nuclei were observed initially after 1 day. After 2 days dividing cells gradually increased in number at the ischemic border zone, reaching a peak increase of 1.12% after 3 days, then gradually decreasing in number. Dividing nuclei increased at the ischemic border zone after 3 days, peaked by 0.14% at day 5, and then decreased. In contrast, Ki-67 positive cells and dividing nuclei were limited in number in the non-ischemic area throughout all experiments. In conclusion, mitogenic cardiomyocytes are present in the adult rat heart following myocardial infarction, but were spatially and temporally restricted.

Original languageEnglish
Pages (from-to)177-181
Number of pages5
JournalMolecular and Cellular Biochemistry
Volume259
Issue number1-2
DOIs
Publication statusPublished - 2004 Apr 1

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Keywords

  • Cardiomyocyte
  • Cell division
  • Ki-67
  • Myocardial infarction
  • Regeneration

ASJC Scopus subject areas

  • Molecular Biology
  • Clinical Biochemistry
  • Cell Biology

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