Vascular endothelial growth factor-C promotes vasculogenesis, angiogenesis, and collagen constriction in three-dimensional collagen gels Stephen M. Bauer,

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Presentation transcript:

Vascular endothelial growth factor-C promotes vasculogenesis, angiogenesis, and collagen constriction in three-dimensional collagen gels Stephen M. Bauer, MD, Richard J. Bauer, PhD, Zhao-Jun Liu, MD, PhD, Haiying Chen, MD, Lee Goldstein, MD, Omaida C. Velazquez, MD Journal of Vascular Surgery Volume 41, Issue 4, Pages 699-707 (April 2005) DOI: 10.1016/j.jvs.2005.01.015 Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 1 VEGF-C enhances fibroblast-mediated collagen constriction. (A) Schematic illustration of the 3-DCMA. The cell monolayer consisted of no cells for collagen constriction, HMVECs for MT1-MMP expression, capillary-like EC network formation, and BMD EPCs for EPC invasion/migration into ECM. The upper experimental layer of collagen consisted of collagen only; rhVEGF-C (100 ng/mL); rhVEGF-C (100 ng/mL) and VEGF-R3/Fc (20 ng/mL); nontransduced fibroblasts; fibroblasts transduced with control vector LacZ/Ad-5 (100 PFU, LacZ); or fibroblasts transduced with VEGF-C/Ad-5 (100 PFU, VEGF-C) with and without VEGF-R3/Fc (20 ng/mL). (B) Collagen constriction by nontransduced fibroblasts (control), fibroblasts transduced with control vector LacZ/Ad-5 (100 PFU, LacZ), or fibroblasts transduced with VEGF-C/Ad-5 (100 PFU, VEGF-C) was measured daily for 15 days by caliper measurements of gel maximum diameter. *P < .001 for VEGF-C vs Control and LacZ. Journal of Vascular Surgery 2005 41, 699-707DOI: (10.1016/j.jvs.2005.01.015) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 2 VEGF-C up-regulates expression of MT1-MMP in HMVECs. Monolayers of HMVECs were plated on collagen type I-coated 24-well plates and overlaid with acellular collagen, followed by a layer of collagen embedded with fibroblasts (5 × 105 cells/mL) (Fig 1, A). Twenty-four hours before construction of the 3-D gel, the fibroblasts to be embedded were separated into three groups: nontransduced (control), transduced with control vector LacZ/Ad-5 at 100 PFU (LacZ), or transduced with VEGF-C/Ad-5 at 100 PFU (VEGF-C). After 7 days of incubation, gels were fixed, embedded in paraffin, and assessed by serial perpendicular cross sections (A-C). Immunohistochemistry of representative cross sections stained for MT1-MMP and counterstained with hematoxylin. (A) Nontransduced fibroblasts, (B, C) fibroblasts transduced with VEGF-C show increased staining for MT1-MMP (B) and increased areas of capillary-like networks (C). (D) Quantification of overall MT1-MMP expression by the number of MT1-MMP (+) cells per ×40 HPF (10 random fields of six serial cross sections per gel; *P < .05 for fibroblasts transduced with VEGF-C vs control and LacZ). Representative microphotographs were obtained under the same magnification as that used for quantification. Journal of Vascular Surgery 2005 41, 699-707DOI: (10.1016/j.jvs.2005.01.015) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 3 VEGF-C stimulates HMVEC vWf-positive capillary-like tubular networks. Immunohistochemistry of gel whole mounts stained for vWF and counterstained with Hoechst (blue nuclear stain). Monolayers of HMVECs were plated on collagen type I-coated 24-well plates and overlaid with acellular collagen, followed by a layer of collagen embedded with fibroblasts (5 × 105 cells/mL). Twenty-four hours before construction of the 3-D gel, the fibroblasts to be embedded were separated into groups: nontransduced Control (A) and Ad5-transduced with VEGF-C/Ad-5 (100 PFU) (B) or LacZ/Ad5 control vector (100 PFU). After 5 days of incubation, the gels were fixed, immunostained for vWF expression under gentle shaking conditions, counterstained with Hoechst, lifted from the well, and whole mounted. Projection views of the whole-mounted gels were analyzed and photographed by using inverted fluorescent microscopy. (C) Quantification of overall number of vWF (+) tubular networks (containing three or more connecting HMVEC cells); 10 random ×20 HPF were counted per gel. *P < .05 for fibroblasts transduced with VEGF-C vs no vector control or Ad5/LacZ control. Representative microphotographs were obtained under the same magnification as that used for quantification. Journal of Vascular Surgery 2005 41, 699-707DOI: (10.1016/j.jvs.2005.01.015) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 4 VEGF-C stimulates the formation of VEGFR-2 + capillary-like structures with lumen. Immunohistochemistry of serial cross sections stained for VEGFR-2 and counterstained with hematoxylin. Monolayers of HMVECs were plated on collagen type I-coated 24-well plates and overlaid with acellular collagen followed by a layer of collagen embedded with fibroblasts (5 × 105 cells/mL) as described in Fig 1, A. Twenty-four hours before construction of the 3-D gel, the fibroblasts to be embedded were separated into two groups: nontransduced (A) and Ad5-transduced with VEGF-C/Ad-5 (100 PFU) (B). After 7 days of incubation, the gels were fixed, embedded in paraffin, serially sectioned on a perpendicular axis, and immunostained for VEGFR-2. (C) Quantification depicts the average number of VEGFR-2 (+) lumina per 10 random ×60 HPF ± standard error of mean. *P < .05 for VEGF-C/Ad-5 fibroblasts vs nontransduced cells; six serial cross sections per gel; black arrows in (B) point to some representative lumina. Representative microphotographs were obtained under the same magnification as that used for quantification. Journal of Vascular Surgery 2005 41, 699-707DOI: (10.1016/j.jvs.2005.01.015) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 5 VEGF-C enhances EPC invasion and migration into 3-DCMA. Bone marrow-derived mononuclear cells from Tie-2 Lac Z transgenic mice, used for their ability to express β-galactosidase, were overlaid with acellular and fibroblast-embedded cellular collagen layers. Control gels devoid of any fibroblasts were constructed (A, no fibroblasts or collagen only), (B, rhVEGF-C + collagen) (C, VEGF-C/Ad5-HMVECs + collagen). Twenty-four hours before construction of the 3-D gel, the fibroblasts to be embedded were separated into two groups: nontransduced (D, fibroblasts + collagen) and Ad5-transduced with VEGF-C/Ad-5 (100 PFU) (E, VEGF-C/Ad5-fibroblast + collagen) and (F, VEGF-C/Ad5-fibroblast + collagen + rhVEGF-R3/Fc). After 7 days of incubation, the gels were removed from the original wells, fixed, stained for β-galactosidase (β-gal), paraffin-embedded, and assessed by serial perpendicular cross sections (nuclear red counterstain). (A-F) Representative cross sections for each of the groups. (G) Quantification of the number of β-gal + cells within the collagen per 10 random ×40 HPF. ‡P < .05 for fibroblast vs collagen only; *P < .05 for VEGF-C/Ad5-fibroblast vs nontransduced fibroblasts, VEGF-C/Ad5-HMVEC, collagen only and rhVEGF-C; **P < .05 for VEGF-C/Ad5-fibroblast vs VEGF-C/Ad5-fibroblast + rhVEGF-R3/Fc. As seen by black arrows and insert in (E), all fibroblast containing collagen gels formed early capillary-like networks lined by EPCs. Journal of Vascular Surgery 2005 41, 699-707DOI: (10.1016/j.jvs.2005.01.015) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions