Transplantation of Unique Subpopulation of Fibroblasts, Muse Cells, Ameliorates Experimental Stroke Possibly via Robust Neuronal Differentiation

Hiroki Uchida, Takahiro Morita, Kuniyasu Niizuma, Yoshihiro Kushida, Yasumasa Kuroda, Shohei Wakao, Hiroyuki Sakata, Yoshiya Matsuzaka, Hajime Mushiake, Teiji Tominaga, Cesario V. Borlongan, Mari Dezawa

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Objective: Muse cells reside as pre-existing pluripotent-like stem cells within the fibroblasts, are nontumorigenic, exhibit differentiation capacity into triploblastic-lineage cells, and replenish lost cells when transplanted in injury models. Cell fate and function of human skin fibroblast-derived Muse cells were evaluated in a rat stroke model. Methods: Muse cells (30,000), collected by pluripotent surface marker stage-specific embryonic antigen-3, were injected stereotaxically into three deposits within the rat ischemic cortex at 2 days after transient middle cerebral artery occlusion, and the cells' biological effects were examined for more than 84 days. Results: Muse cells spontaneously and promptly committed to neural/neuronal-lineage cells when cocultured with stroke brain slices. Muse-transplanted stroke rats exhibited significant improvements in neurological and motor functions compared to control groups at chronic days 70 and 84, without a reduction in the infarct size. Muse cells survived in the host brain for up to 84 days and differentiated into NeuN (∼65%), MAP-2 (∼32%), calbindin (∼28%), and GST-π (∼25%)-positive cells in the cortex, but glial fibrillary acidic protein-positive cells were rare. Tumor formation was not observed. Muse cells integrated into the sensory-motor cortex, extended their neurites into cervical spinal cord, and displayed normalized hind limb somatosensory evoked potentials. Interpretation: Muse cells are unique from other stem cells in that they differentiate with high ratio into neuronal cells after integration with host brain microenvironment, possibly reconstructing the neuronal circuit to mitigate stroke symptoms. Human fibroblast-derived Muse cells pose as a novel source of transplantable stem cells, circumventing the need for gene manipulations, especially when contemplating autologous cell therapy for stroke.

Original languageEnglish
Pages (from-to)160-173
Number of pages14
JournalStem Cells
Volume34
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Cellular therapy
  • Mesenchymal stem cells
  • Neuronal differentiation
  • Pluripotent stem cells
  • Transplantation

ASJC Scopus subject areas

  • Molecular Medicine
  • Developmental Biology
  • Cell Biology

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