Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells

T. Sakamoto, Tatsuro Ishibashi, H. Kimura, H. Yoshikawa, C. Spee, M. S. Harris, D. R. Hinton, S. J. Ryan

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Purpose. To examine the possible inhibitory effect of tecogalan sodium, derived from bacteria, on three important components of in vitro angiogenesis (endothelial proliferation, migration, and tube formation in a collagen gel) using bovine choroidal endothelial cells (CECs). Methods. The effects of tecogalan sodium (1, 5, 25, 125, and 250 μg/ml) on cultured CECs were examined when basic fibroblast growth factor (bFGF, 10 ng/ml), vascular endothelial growth factor (VEGF, 50 ng/ml), a combination of bFGF (10 ng/ml) and VEGF (50 ng/ml) (bFGF/VEGF) and 10% fetal calf serum (FCS) were used as angiogenic stimulants. For the proliferation assay, CECs were cultured and the cell numbers counted on days 1, 3, and 5. For migration assay, CECs were seeded in the upper half of a Boyden chamber while an angiogenic growth factor was loaded in the lower half. After 6 hours of incubation, cell migration was evaluated by counting the numbers of migrated cells per microscopic field on the lower side of the filter. For the tube-forming assay, CECs were seeded in a type I collagen gel, and the length of the tube- like structures (an indicator of angiogenesis) formed by CECs per microscopic field was quantified by image analysis. The effect of a neutralizing antibody for bFGF also was tested in these three assays. Results. All tested angiogenic stimulants induced CEC proliferation. The stimulatory effect of bFGF and bFGF/VEGF was reduced by tecogalan sodium (IC50 for bFGF effect, 26.1 μg/ml). However, the effect of VEGF and of 10% FCS was not altered by low doses of tecogalan sodium (<25 μg/ml). Chemotaxis of CECs was stimulated by bFGF alone and by bFGF/VEGF, and this effect was inhibited by tecogalan sodium (IC50 for bFGF, 3.2 μg/ml). Stimulation of chemotaxis by VEGF alone and by 10% FCs was not affected by tecogalan sodium in low doses but was inhibited by high doses. Tube formation was stimulated by administration of each of the factors. Stimulation of tube formation by bFGF and bFGF/VEGF was inhibited by tecogalan sodium (IC50 for bFGF, 18.2 μg/ml). High doses of tecogalan sodium (125 and 250 μg/ml) also inhibited 10% FCS-induced proliferation, migration, and tube formation. Conclusion. bFGF, VEGF, and a combination of bFGF and VEGF stimulated proliferation, migration, and tube formation by CECs in vitro. These stimulatory effects, but especially those of bFGF, were inhibited by tecogalan sodium. If tecogalan sodium can be shown to have a similar effect in vivo, it might have the potential for pharmacologic control of subretinal neovascularization.

Original languageEnglish
Pages (from-to)1076-1083
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume36
Issue number6
Publication statusPublished - Jan 1 1995
Externally publishedYes

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Vascular Endothelial Growth Factor A
Endothelial Cells
Inhibitory Concentration 50
Chemotaxis
tecogalan
In Vitro Techniques
Fibroblast Growth Factor 10
Cell Count
Gels
Serum
Angiogenesis Inducing Agents
Fibroblast Growth Factor 2
Collagen Type I
Neutralizing Antibodies
Cell Movement
Cultured Cells
Intercellular Signaling Peptides and Proteins
Collagen
Cell Proliferation
Bacteria

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Sakamoto, T., Ishibashi, T., Kimura, H., Yoshikawa, H., Spee, C., Harris, M. S., ... Ryan, S. J. (1995). Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells. Investigative Ophthalmology and Visual Science, 36(6), 1076-1083.

Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells. / Sakamoto, T.; Ishibashi, Tatsuro; Kimura, H.; Yoshikawa, H.; Spee, C.; Harris, M. S.; Hinton, D. R.; Ryan, S. J.

In: Investigative Ophthalmology and Visual Science, Vol. 36, No. 6, 01.01.1995, p. 1076-1083.

Research output: Contribution to journalArticle

Sakamoto, T, Ishibashi, T, Kimura, H, Yoshikawa, H, Spee, C, Harris, MS, Hinton, DR & Ryan, SJ 1995, 'Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells', Investigative Ophthalmology and Visual Science, vol. 36, no. 6, pp. 1076-1083.
Sakamoto, T. ; Ishibashi, Tatsuro ; Kimura, H. ; Yoshikawa, H. ; Spee, C. ; Harris, M. S. ; Hinton, D. R. ; Ryan, S. J. / Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells. In: Investigative Ophthalmology and Visual Science. 1995 ; Vol. 36, No. 6. pp. 1076-1083.
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title = "Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells",
abstract = "Purpose. To examine the possible inhibitory effect of tecogalan sodium, derived from bacteria, on three important components of in vitro angiogenesis (endothelial proliferation, migration, and tube formation in a collagen gel) using bovine choroidal endothelial cells (CECs). Methods. The effects of tecogalan sodium (1, 5, 25, 125, and 250 μg/ml) on cultured CECs were examined when basic fibroblast growth factor (bFGF, 10 ng/ml), vascular endothelial growth factor (VEGF, 50 ng/ml), a combination of bFGF (10 ng/ml) and VEGF (50 ng/ml) (bFGF/VEGF) and 10{\%} fetal calf serum (FCS) were used as angiogenic stimulants. For the proliferation assay, CECs were cultured and the cell numbers counted on days 1, 3, and 5. For migration assay, CECs were seeded in the upper half of a Boyden chamber while an angiogenic growth factor was loaded in the lower half. After 6 hours of incubation, cell migration was evaluated by counting the numbers of migrated cells per microscopic field on the lower side of the filter. For the tube-forming assay, CECs were seeded in a type I collagen gel, and the length of the tube- like structures (an indicator of angiogenesis) formed by CECs per microscopic field was quantified by image analysis. The effect of a neutralizing antibody for bFGF also was tested in these three assays. Results. All tested angiogenic stimulants induced CEC proliferation. The stimulatory effect of bFGF and bFGF/VEGF was reduced by tecogalan sodium (IC50 for bFGF effect, 26.1 μg/ml). However, the effect of VEGF and of 10{\%} FCS was not altered by low doses of tecogalan sodium (<25 μg/ml). Chemotaxis of CECs was stimulated by bFGF alone and by bFGF/VEGF, and this effect was inhibited by tecogalan sodium (IC50 for bFGF, 3.2 μg/ml). Stimulation of chemotaxis by VEGF alone and by 10{\%} FCs was not affected by tecogalan sodium in low doses but was inhibited by high doses. Tube formation was stimulated by administration of each of the factors. Stimulation of tube formation by bFGF and bFGF/VEGF was inhibited by tecogalan sodium (IC50 for bFGF, 18.2 μg/ml). High doses of tecogalan sodium (125 and 250 μg/ml) also inhibited 10{\%} FCS-induced proliferation, migration, and tube formation. Conclusion. bFGF, VEGF, and a combination of bFGF and VEGF stimulated proliferation, migration, and tube formation by CECs in vitro. These stimulatory effects, but especially those of bFGF, were inhibited by tecogalan sodium. If tecogalan sodium can be shown to have a similar effect in vivo, it might have the potential for pharmacologic control of subretinal neovascularization.",
author = "T. Sakamoto and Tatsuro Ishibashi and H. Kimura and H. Yoshikawa and C. Spee and Harris, {M. S.} and Hinton, {D. R.} and Ryan, {S. J.}",
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T1 - Effect of tecogalan sodium on angiogenesis in vitro by choroidal endothelial cells

AU - Sakamoto, T.

AU - Ishibashi, Tatsuro

AU - Kimura, H.

AU - Yoshikawa, H.

AU - Spee, C.

AU - Harris, M. S.

AU - Hinton, D. R.

AU - Ryan, S. J.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - Purpose. To examine the possible inhibitory effect of tecogalan sodium, derived from bacteria, on three important components of in vitro angiogenesis (endothelial proliferation, migration, and tube formation in a collagen gel) using bovine choroidal endothelial cells (CECs). Methods. The effects of tecogalan sodium (1, 5, 25, 125, and 250 μg/ml) on cultured CECs were examined when basic fibroblast growth factor (bFGF, 10 ng/ml), vascular endothelial growth factor (VEGF, 50 ng/ml), a combination of bFGF (10 ng/ml) and VEGF (50 ng/ml) (bFGF/VEGF) and 10% fetal calf serum (FCS) were used as angiogenic stimulants. For the proliferation assay, CECs were cultured and the cell numbers counted on days 1, 3, and 5. For migration assay, CECs were seeded in the upper half of a Boyden chamber while an angiogenic growth factor was loaded in the lower half. After 6 hours of incubation, cell migration was evaluated by counting the numbers of migrated cells per microscopic field on the lower side of the filter. For the tube-forming assay, CECs were seeded in a type I collagen gel, and the length of the tube- like structures (an indicator of angiogenesis) formed by CECs per microscopic field was quantified by image analysis. The effect of a neutralizing antibody for bFGF also was tested in these three assays. Results. All tested angiogenic stimulants induced CEC proliferation. The stimulatory effect of bFGF and bFGF/VEGF was reduced by tecogalan sodium (IC50 for bFGF effect, 26.1 μg/ml). However, the effect of VEGF and of 10% FCS was not altered by low doses of tecogalan sodium (<25 μg/ml). Chemotaxis of CECs was stimulated by bFGF alone and by bFGF/VEGF, and this effect was inhibited by tecogalan sodium (IC50 for bFGF, 3.2 μg/ml). Stimulation of chemotaxis by VEGF alone and by 10% FCs was not affected by tecogalan sodium in low doses but was inhibited by high doses. Tube formation was stimulated by administration of each of the factors. Stimulation of tube formation by bFGF and bFGF/VEGF was inhibited by tecogalan sodium (IC50 for bFGF, 18.2 μg/ml). High doses of tecogalan sodium (125 and 250 μg/ml) also inhibited 10% FCS-induced proliferation, migration, and tube formation. Conclusion. bFGF, VEGF, and a combination of bFGF and VEGF stimulated proliferation, migration, and tube formation by CECs in vitro. These stimulatory effects, but especially those of bFGF, were inhibited by tecogalan sodium. If tecogalan sodium can be shown to have a similar effect in vivo, it might have the potential for pharmacologic control of subretinal neovascularization.

AB - Purpose. To examine the possible inhibitory effect of tecogalan sodium, derived from bacteria, on three important components of in vitro angiogenesis (endothelial proliferation, migration, and tube formation in a collagen gel) using bovine choroidal endothelial cells (CECs). Methods. The effects of tecogalan sodium (1, 5, 25, 125, and 250 μg/ml) on cultured CECs were examined when basic fibroblast growth factor (bFGF, 10 ng/ml), vascular endothelial growth factor (VEGF, 50 ng/ml), a combination of bFGF (10 ng/ml) and VEGF (50 ng/ml) (bFGF/VEGF) and 10% fetal calf serum (FCS) were used as angiogenic stimulants. For the proliferation assay, CECs were cultured and the cell numbers counted on days 1, 3, and 5. For migration assay, CECs were seeded in the upper half of a Boyden chamber while an angiogenic growth factor was loaded in the lower half. After 6 hours of incubation, cell migration was evaluated by counting the numbers of migrated cells per microscopic field on the lower side of the filter. For the tube-forming assay, CECs were seeded in a type I collagen gel, and the length of the tube- like structures (an indicator of angiogenesis) formed by CECs per microscopic field was quantified by image analysis. The effect of a neutralizing antibody for bFGF also was tested in these three assays. Results. All tested angiogenic stimulants induced CEC proliferation. The stimulatory effect of bFGF and bFGF/VEGF was reduced by tecogalan sodium (IC50 for bFGF effect, 26.1 μg/ml). However, the effect of VEGF and of 10% FCS was not altered by low doses of tecogalan sodium (<25 μg/ml). Chemotaxis of CECs was stimulated by bFGF alone and by bFGF/VEGF, and this effect was inhibited by tecogalan sodium (IC50 for bFGF, 3.2 μg/ml). Stimulation of chemotaxis by VEGF alone and by 10% FCs was not affected by tecogalan sodium in low doses but was inhibited by high doses. Tube formation was stimulated by administration of each of the factors. Stimulation of tube formation by bFGF and bFGF/VEGF was inhibited by tecogalan sodium (IC50 for bFGF, 18.2 μg/ml). High doses of tecogalan sodium (125 and 250 μg/ml) also inhibited 10% FCS-induced proliferation, migration, and tube formation. Conclusion. bFGF, VEGF, and a combination of bFGF and VEGF stimulated proliferation, migration, and tube formation by CECs in vitro. These stimulatory effects, but especially those of bFGF, were inhibited by tecogalan sodium. If tecogalan sodium can be shown to have a similar effect in vivo, it might have the potential for pharmacologic control of subretinal neovascularization.

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