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CD20-related signaling pathway is differently activated in normal and dystrophic circulating CD133(+) stem cells

D Parolini1, M Meregalli, M Belicchi

  • 1Department of Neurological Sciences, Fondazione IRCCS Ospedale Maggiore Policlinico, Centro Dino Ferrari, University of Milan, Italy.

Cellular and Molecular Life Sciences : CMLS
|January 21, 2009
PubMed

Insights

Researchers found a CD20-related signaling pathway that affects calcium levels in blood stem cells. This pathway is altered in Duchenne muscular dystrophy (DMD), suggesting a new target for understanding this disease.

Area of Science:

  • Biomedical Science
  • Stem Cell Biology
  • Molecular Medicine

Background:

  • Circulating CD133(+) stem cells possess myogenic properties.
  • The B-cell marker CD20 is unexpectedly expressed on blood-derived CD133(+) stem cells.
  • CD20 signaling influences intracellular calcium homeostasis, a factor implicated in Duchenne muscular dystrophy (DMD).

Purpose of the Study:

  • To investigate the role of CD20 signaling in blood-derived CD133(+) stem cells.
  • To explore the potential link between CD20, calcium regulation, and DMD.
  • To compare the activation of CD20-related pathways in normal and dystrophic stem cells.

Main Methods:

  • Identification and characterization of CD133(+) stem cell subpopulations.
  • Analysis of CD20 expression on blood-derived stem cells.
  • Stimulation with brain-derived neurotrophic factor (BDNF) and measurement of intracellular calcium ([Ca(2+)](i)) changes.

Main Results:

  • A subpopulation of CD133(+) cells with myogenic properties was identified.
  • CD20 expression was observed on blood-derived CD133(+) stem cells.
  • A CD20-related signaling pathway inducing [Ca(2+)](i) increase showed differential activation between normal and dystrophic stem cells upon BDNF stimulation.

Conclusions:

  • Findings suggest a "CD20-related calcium impairment" in dystrophic cells.
  • This study provides a foundation for understanding DMD pathology and dystrophic stem cell behavior.
  • Highlights potential pathways involved in DMD etiology and stem cell dysfunction.

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