The interleukin-6 and vascular endothelial growth factor in hematopoietic stem cell transplantation.

Organ Transplant Research Center, Nemazi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran.
Saudi journal of kidney diseases and transplantation: an official publication of the Saudi Center for Organ Transplantation, Saudi Arabia 05/2012; 23(3):521-5.
Source: PubMed


We studied the correlation between changes in the serum levels of vascular endothelial growth factor (VEGF) and interleukin-6 (IL-6) with complications such as acute graft versus host disease (aGVHD), veno-occlusive disease (VOD) or occurrence of infection after hematopoietic stem cell transplantation (HSCT). Serum VEGF and IL-6 levels were sequentially measured by enzyme-linked immunosorbant assay (ELISA) in 35 patients who had undergone HSCT. Serum levels of IL-6 in patients with aGVHD were increased in comparison with patients without aGVHD, but the difference was not statistically significant. Serum levels of VEGF were only increased in patients with aGVHD during the early days after transplantation. No significantly altered levels of IL-6 and VEGF were observed in patients with VOD or sepsis. These results demonstrate that rising levels of VEGF and IL-6 may be good and specific biomarkers for transplant aGVHD.

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    ABSTRACT: This study aimed to investigate the significance of cytokine expression in supernatant from hematopoietic stem/progenitor cells (HSCs/HPCs) co-cultured with mesenchymal stem cells (MSCs) or endothelial progenitor cells (EPCs). Mononuclear cells (MNCs) were isolated from normal human umbilical cord blood and then cultured solely or co-cultured with MSCs or EPCs. Changes in the number of MNCs and HSCs/HPCs were observed, and MNC proliferation was tested by carboxyfluorescein diacetate succinimidyl ester. The cultured supernatants of the treated MSCs and EPCs were collected at 24 h after co-culture and used to determine the concentrations of IL-3, IL-6, stem cell factor (SCF), TPO, Flt3l, and VEGF. The total number and proliferation of MNCs increased significantly when co-cultured with MSCs or EPCs than when cultured alone, particularly when MNCs were co-cultured with EPCs. The differences in IL-3 and Flt3l concentrations between groups were not significant. However, IL-6 in the MSC group was significantly higher than that in the two other groups. The SCF and TPO concentrations were highly expressed in the EPC group. The VEGF concentrations in the MSC group and the EPC group were higher than those in the control group. These results indicated that MSCs and EPCs possibly favor the proliferation of MNCs and HSCs/HPCs. IL-6 and VEGF may be related to hematopoietic reconstitution and homing ability of HSCs/HPCs. TPO may have a specific relationship with the promotion of HSCs/HPCs differentiation.
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