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Homing of annexin-labeled stem cells to apoptotic cells

Abstract

Ischemic diseases are characterized by the presence of pro-apoptotic stimuli, which initiate a cascade of processes that lead to cell injury and death. Several molecules and events represent detectable indicators of the different stages of apoptosis. Among these indicators is phosphatidylserine (PS) translocation from the inner to the outer leaflet of the plasma membrane, which can be detected by annexinV (ANXA5) conjugation. This is a widely used in vivo and in vitro assay marking the early stages of apoptosis. We report here on an original method that employs PS-ANXA5 conjugation to target stem cells to apoptotic cells. Mesenchymal stem cells (MSCs) from GFP-positive transgenic rats were biotinylated on membrane surfaces with sulfosuccinimidyl-6-(biotinamido) hexanoate (sulfo-NHS-LC-biot) and then bound to avidin. The avidin-biotinylated MSCs were labeled with biotin conjugated ANXA5. Bovine aortic endothelial cells (BAE-1 cells) were exposed to UVC to induce caspasedependent apoptosis. Finally, we tested the ability of ANXA5-labeled MSCs to bind BAE-1 apoptotic cells: suspended ANXA5-labeled MSCs were seeded for 1 hour on a monolayer of UV-treated or control BAE-1 cells. After washing, the number of MSCs bound to BAE-1 cells was evaluated by confocal microscopy. Statistical analysis demonstrated a significant increase in the number of MSCs tagged to apoptotic BAE-1 cells. Therefore, stem cell ANXA5 tagging via biotin-avidin bridges could be a straightforward method of improving homing to apoptotic tissues.

Abbreviations

ANXA5:

annexinV

BAE-1 cells:

bovine aortic endothelial cells

DMEM:

Dulbecco’s modified Eagle’s medium

FCS:

fetal calf serum

FLICA:

sulforhodaminyl-L-aspartylglutamylvalylaspartylfluoromethyl ketone

GFP:

green fluorescent protein

αMEM:

minimum essential Eagle’s medium, alpha modified

MSCs:

mesenchymal stem cells

PBS:

phosphate buffer saline

PS:

phosphatidylserine

sulfo-NHS-LC-biot:

sulfosuccinimidyl-6-(biotinamido) hexanoate

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Correspondence to Maria Pia Gallo.

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A. Gerasimou, R. Ramella and A. Brero contributed equally to this paper.

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Gerasimou, A., Ramella, R., Brero, A. et al. Homing of annexin-labeled stem cells to apoptotic cells. Cell Mol Biol Lett 14, 100–112 (2009). https://doi.org/10.2478/s11658-008-0038-1

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  • DOI: https://doi.org/10.2478/s11658-008-0038-1

Key words

  • Stem cell
  • Apoptosis
  • Homing
  • Annexin