The Role of Bone Marrow Mononuclear Cells in Angiogenesis in Mouse Hind Limb Ischemic Model.
10.5045/kjh.2007.42.2.106
- Author:
Hyeon Min CHO
1
;
Jong Wook HONG
;
Jun Gi KIM
;
Jeong A KIM
Author Information
1. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea. jakim@catholic.ac.kr
- Publication Type:Original Article
- Keywords:
Ischemia;
Angiogenesis;
Bone marrow cell;
VEGF;
MMP-9;
SDF-1;
CXCR-4
- MeSH:
Animals;
Blotting, Western;
Bone Marrow Cells;
Bone Marrow Transplantation;
Bone Marrow*;
Extremities*;
In Situ Hybridization, Fluorescence;
Ischemia;
Mice*;
Up-Regulation;
Vascular Endothelial Growth Factor A;
Y Chromosome
- From:Korean Journal of Hematology
2007;42(2):106-113
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Angiogenesis is enhanced in the ischemic tissues after the injection of bone marrow cells (BMCs). However the exact mechanisms for this are not yet fully understood. METHODS: A unilateral ischemic limb was surgically induced in mice and then BMCs were injected into the ischemic area. We measured the capillary/muscle ratio. Fluorescence-labeled BMCs were injected into the ischemic tissues and then the locations of the cells were examined by using a confocal microscope. Recruitment of bone marrow-derived cells into the ischemic tissue was examined in a sex-mismatched bone marrow transplantation (BMT) setting by identifying the Y chromosome with using the FISH technique. The expressions of VEGF, MMP-9, SDF-1 and CXCR-4 were measured by Western blot analysis. RESULTS: The capillary/muscle ratio was more increased in the BMC-injected group than in the control group (P<0.05). Florescence-labeled BMCs, which had been directly injected into ischemic tissue, were not detected in the tissue. In the sex-mismatched bone marrow transplantation models, the ischemic tissues of the BMC-injected group recruited a much greater number of Y chromosome-positive bone marrow- derived cells, as compared to the control group. The expressions of VEGF and MMP-9 were increased after injection of BMCs. SDF-1 was expressed on the seventh day in the BMC-injected group and CXCR-4 was highly expressed until 12 weeks in the BMC-injected group. CONCLUSION: We suggest that the injection of BMCs into ischemic tissue recruits CXCR-4-positvie cells from the bone marrow via the up-regulation of VEGF, MMP-9 and SDF-1, and these CXCR-4-positive cells may play a role in neovascularization.
