Purified recombinant TAT-homeobox B4 expands CD34+ umbilical cord blood and peripheral blood progenitor cells Ex vivo

Chi Hung Huang, Po Min Chen, Tsung Chi Lu, Wen Mei Kung, Tzeon Jye Chiou, Muh Hwa Yang, Jung Yie Kao, Kou Juey Wu

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Hematopoietic stem cells (HSCs) are commonly used in clinical transplantation protocols to treat a variety of diseases. However, efficient transplantation requires a substantial amount of HSCs from different sources and may require expansion. Therefore, effective expansion of HSCs remains a technical hurdle blocking the development of advanced cell therapies. The product of the human homeobox B4 (HOXB4) gene was recently demonstrated to effectively expand HSCs from umbilical cord blood (UCB) or bone marrow in either a retroviral or recombinant protein form. Our study purified TAT-HOXB4 proteins and demonstrated their ability to expand UCB and peripheral blood (PB) progenitor cells. The results showed that the TAT-HOXB4 gene product expanded the CD34+ progenitor cells from UCB and PB by ∼7.5-fold. The results from a semisolid cloning assay, a human long-term culture-initiating cell assay, and a nonobese diabetic-severe combined immunodeficiency mice repopulating assay showed that TAT-HOXB4 expanded hematopoietic progenitor cells while retaining their repopulating capacity and multipotency. TAT-HOXB4 protein also expanded engrafted stem cells that were previously expanded in a secondary transplantation assay. The results demonstrated the feasibility of using TAT-HOXB4 to expand UCB and PB progenitor cells, which are readily available to treat different hematological malignancies and nonhematological diseases.

Original languageEnglish
Pages (from-to)487-496
Number of pages10
JournalTissue Engineering - Part C: Methods
Issue number3
Publication statusPublished - Jun 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Medicine (miscellaneous)
  • Biomedical Engineering


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