Asymmetric chromatid segregation in cardiac progenitor cells is enhanced by Pim-1 kinase

Balaji Sundararaman, Daniele Avitabile, Mathias H. Konstandin, Christopher T. Cottage, Natalie Gude, Mark A. Sussman

Research output: Contribution to journalArticle

Abstract

Rationale: Cardiac progenitor cells (CPCs) in the adult heart are used for cell-based treatment of myocardial damage, but factors determining stemness, self-renewal, and lineage commitment are poorly understood. Immortal DNA strands inherited through asymmetric chromatid segregation correlate with self-renewal of adult stem cells, but the capacity of CPCs for asymmetric segregation to retain immortal strands is unknown. Cardioprotective kinase Pim-1 increases asymmetric cell division in vivo, but the ability of Pim-1 to enhance asymmetric chromatid segregation is unknown. Objective: We aimed to demonstrate immortal strand segregation in CPCs and the enhancement of asymmetric chromatid distribution by Pim-1 kinase. Methods and Results: Asymmetric segregation is tracked by incorporation of bromodeoxyuridine. The CPC DNA was labeled for several generations and then blocked in second cytokinesis during chase to determine distribution of immortal versus newly synthesized strands. Intensity ratios of binucleated CPCs with bromodeoxyuridine of ≥70:30 between daughter nuclei indicative of asymmetric chromatid segregation occur with a frequency of 4.57, and asymmetric chromatid segregation is demonstrated at late mitotic phases. Asymmetric chromatid segregation is significantly enhanced by Pim-1 overexpression in CPCs (9.19 versus 4.79 in eGFP-expressing cells; P=0.006). CONCLUSIONS:: Asymmetric segregation of chromatids in CPCs is increased nearly two-fold with Pim-1 kinase overexpression, indicating that Pim-1 promotes self-renewal of stem cells.

Original languageEnglish
Pages (from-to)1169-1173
Number of pages5
JournalCirculation Research
Volume110
Issue number9
DOIs
Publication statusPublished - Apr 27 2012

Keywords

  • Asymmetric cell division
  • Asymmetric chromatid segregation
  • Bromodeoxyuridine
  • Cytochalasin B
  • Immortal DNA strand hypothesis

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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    Sundararaman, B., Avitabile, D., Konstandin, M. H., Cottage, C. T., Gude, N., & Sussman, M. A. (2012). Asymmetric chromatid segregation in cardiac progenitor cells is enhanced by Pim-1 kinase. Circulation Research, 110(9), 1169-1173. https://doi.org/10.1161/CIRCRESAHA.112.267716