Determination of bone marrow-derived endothelial progenitor cell significance in angiogenic growth factor-induced neovascularization in vivo

Toshinori Murayama, Oren M. Tepper, Marcy Silver, Hong Ma, Douglas W. Losordo, Jeffery M. Isner, Takayuki Asahara, Christoph Kalka

Research output: Contribution to journalArticle

256 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)967-972
Number of pages6
JournalExperimental Hematology
Volume30
Issue number8
DOIs
StatePublished - 2002
Externally publishedYes

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Angiogenesis Inducing Agents
Intercellular Signaling Peptides and Proteins
Bone Marrow
Endothelial Cells
Bone Marrow Cells
Staining and Labeling
Cornea
Galactosidases
Corneal Neovascularization
Lac Operon
Fibroblast Growth Factor 2
Endothelial Progenitor Cells
Bone Marrow Transplantation
Vascular Endothelial Growth Factor A
Transgenic Mice
Fluorescent Antibody Technique
Blood Vessels
Transplantation
Immunohistochemistry
matrigel

ASJC Scopus subject areas

  • Cancer Research
  • Cell Biology
  • Genetics
  • Hematology
  • Oncology
  • Transplantation

Cite this

Determination of bone marrow-derived endothelial progenitor cell significance in angiogenic growth factor-induced neovascularization in vivo. / Murayama, Toshinori; Tepper, Oren M.; Silver, Marcy; Ma, Hong; Losordo, Douglas W.; Isner, Jeffery M.; Asahara, Takayuki; Kalka, Christoph.

In: Experimental Hematology, Vol. 30, No. 8, 2002, p. 967-972.

Research output: Contribution to journalArticle

Murayama, Toshinori ; Tepper, Oren M. ; Silver, Marcy ; Ma, Hong ; Losordo, Douglas W. ; Isner, Jeffery M. ; Asahara, Takayuki ; Kalka, Christoph. / Determination of bone marrow-derived endothelial progenitor cell significance in angiogenic growth factor-induced neovascularization in vivo. In: Experimental Hematology. 2002 ; Vol. 30, No. 8. pp. 967-972.
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abstract = "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.",
author = "Toshinori Murayama and Tepper, {Oren M.} and Marcy Silver and Hong Ma and Losordo, {Douglas W.} and Isner, {Jeffery M.} and Takayuki Asahara and Christoph Kalka",
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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

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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