TY - JOUR
T1 - Determination of bone marrow-derived endothelial progenitor cell significance in angiogenic growth factor-induced neovascularization in vivo
AU - Murayama, Toshinori
AU - Tepper, Oren M.
AU - Silver, Marcy
AU - Ma, Hong
AU - Losordo, Douglas W.
AU - Isner, Jeffery M.
AU - Asahara, Takayuki
AU - Kalka, Christoph
N1 - Funding Information:
This research was supported by National Institutes of Health Grants HL 53354, HL57516, and HL60911. T.M. is the recipient of grants from the Naito Foundation and Japan Research Foundation for Clinical Pharmacology. T.A. is the recipient of Grant-in-Aid 0051121T from the American Heart Association.
PY - 2002
Y1 - 2002
N2 - Objective: Our laboratory and others recently provided evidence indicating that endothelial progenitor cells (EPCs) participate in postnatal neovascularization. However, the extent to which EPCs contribute to adult neovascularization remains unclear. To address this issue, we investigated the quantitative contribution of EPCs to newly formed vascular structures in an in vivo Matrigel plug assay and corneal micropocket assay. Materials and Methods: Lethally irradiated FVB mice were transplanted with bone marrow (BM) mononuclear cells from transgenic mice constitutively expressing β-galactosidase (β-gal) encoded by the lacZ gene regulated by an endothelial-specific tie-2 promoter. Reconstitution of the transplanted BM leads to the expression of lacZ in mice, which is restricted to BM cells expressing tie-2.ResultsFour weeks after BM transplantation (BMT), tie-2/lacZ/BMT mice were implanted with either Matrigel containing fibroblast growth factor-2 subcutaneously or with a vascular endothelial growth factor pellet into the cornea. After 7 days, the Matrigel plug or the cornea was removed and analyzed by X-gal staining or immunostaining for β-gal. X-gal staining of the Matrigel plug identified 5.7% ± 1.2% of endothelial cells (ECs) as cells originated from BM-derived EPCs, whereas the more sensitive technique of immunofluorescence identified 26.5% ± 0.9% of ECs. Similarly, EPC-derived cells comprised 5.0% ± 2.4% and 17.7% ± 3.6% of the ECs in corneal neovascularization identified by X-gal staining and immunohistochemistry, respectively. Ki67 staining of the corneal tissue documented that the majority of EPC-derived cells were actively proliferating in situ. Conclusion: These findings suggest that BM-derived EPCs make a significant contribution to angiogenic growth factor-induced neovascularization that may account for up to 26% of all ECs.
AB - Objective: Our laboratory and others recently provided evidence indicating that endothelial progenitor cells (EPCs) participate in postnatal neovascularization. However, the extent to which EPCs contribute to adult neovascularization remains unclear. To address this issue, we investigated the quantitative contribution of EPCs to newly formed vascular structures in an in vivo Matrigel plug assay and corneal micropocket assay. Materials and Methods: Lethally irradiated FVB mice were transplanted with bone marrow (BM) mononuclear cells from transgenic mice constitutively expressing β-galactosidase (β-gal) encoded by the lacZ gene regulated by an endothelial-specific tie-2 promoter. Reconstitution of the transplanted BM leads to the expression of lacZ in mice, which is restricted to BM cells expressing tie-2.ResultsFour weeks after BM transplantation (BMT), tie-2/lacZ/BMT mice were implanted with either Matrigel containing fibroblast growth factor-2 subcutaneously or with a vascular endothelial growth factor pellet into the cornea. After 7 days, the Matrigel plug or the cornea was removed and analyzed by X-gal staining or immunostaining for β-gal. X-gal staining of the Matrigel plug identified 5.7% ± 1.2% of endothelial cells (ECs) as cells originated from BM-derived EPCs, whereas the more sensitive technique of immunofluorescence identified 26.5% ± 0.9% of ECs. Similarly, EPC-derived cells comprised 5.0% ± 2.4% and 17.7% ± 3.6% of the ECs in corneal neovascularization identified by X-gal staining and immunohistochemistry, respectively. Ki67 staining of the corneal tissue documented that the majority of EPC-derived cells were actively proliferating in situ. Conclusion: These findings suggest that BM-derived EPCs make a significant contribution to angiogenic growth factor-induced neovascularization that may account for up to 26% of all ECs.
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U2 - 10.1016/S0301-472X(02)00867-6
DO - 10.1016/S0301-472X(02)00867-6
M3 - Article
C2 - 12160849
AN - SCOPUS:0036327870
SN - 0301-472X
VL - 30
SP - 967
EP - 972
JO - Experimental Hematology
JF - Experimental Hematology
IS - 8
ER -