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Epidemiology of cardiovascular disease
Spleen recruits endothelial progenitor cells (EPCs) via SDF-1/CXCR4 axis(*)
  1. Xiaohui Zhao1,
  2. Dehui Qian1,
  3. Nan Wu2,
  4. Yangguang Yin1,
  5. Mingbao Song1,
  6. Shiyong Yu1,
  7. Jianfei Chen1,
  8. Bin Cui1
  1. 1Department Of Cardiology, Xinqiao Hospital, China
  2. 2Department Of Ophthalmology, Southwest Hospital Third Military Medical University, Chongqing, China

Abstract

Endothelial progenitor cells (EPCs) therapy represents a novel strategy for a variety of diseases. Interestingly, spleen acts an important reservoir during EPCs trafficking. Therefore, the authors aim to investigate the involvement of SDF-1/CXCR4 in EPCs settlement in the spleen. EPCs were cultured and characterised as previous described methods. Then, 1×106 EPCs were labelled with DiI-acLDL and intravenously infused into C57/BL6 mice. Immunohistochemical staining showed homing of transplanted EPCs in spleen 24 h later, indicating recruitment of transplanted EPCs in spleen. Physiological distribution of EPCs in different organs was evaluated by fluorescence-activated cell sorting (FACS) analysis of Sca-1/Flk-1 positive cells, which demonstrated physiological settlement of EPCs in spleen. Removal of splenic niche by splenectomy augmented circulating EPCs 12 and 24 h later, indicating an important role of spleen on modulation of EPCs circulating dynamics. To determine the involvement of SDF-1/CXCR4 in EPCs migration and homing, expression of SDF-1 in spleen and CXCR4 in EPCs were revealed by ELISA and RT-PCR. Modified Boyden chamber assay disclosed that SDF-1 (10.100 ng/ml) induced EPCs migration in vitro. Injection of SDF-1 protein into spleen increased the number of splenic EPCs, while local administration of SDF-1 antibody or block of SDF-1/CXCR4 axis with AMD3100 attenuated their migration and settlement. These results indicate that the SDF-1/CXCR4 axis is involved in recruitment of EPCs to the spleen which will deepen our understanding on EPCs circulating kinetics.

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