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Abstract 228: Distinct Roles of PDGF-C and VEGF in Impaired Angiogenesis of Diabetes and Its Implication in Therapeutic Angiogenesis

Junji Moriya, Napoleone Ferrara
Arteriosclerosis, Thrombosis, and Vascular Biology. 2013;33:A228
Junji Moriya
Rsch Dept of Oncology, Genentech Inc., South San Francisco, CA
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Napoleone Ferrara
Rsch Dept of Oncology, Genentech Inc., South San Francisco, CA
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Abstract

Background Platelet-derived growth factor-C (PDGF-C) is known to promote angiogenesis independently of vascular endothelial growth factor (VEGF), although its significance in postnatal angiogenesis in vivo remains poorly understood.

Methods and Results We employed murine model of hind limb ischemia and found that expression of PDGF-C and its receptor PDGFR-alpha were markedly up-regulated in ischemic limbs. Treatment with a neutralizing antibody against PDGF-C significantly impaired blood flow recovery and neovascularization after ischemia almost to the same extent as treatment with a VEGF neutralizing antibody. Moreover, PDGF-C- deficient mice showed a reduced blood flow recovery after ischemia compared to wild-type mice, confirming a strong pro-angiogenic activity of PDGF-C.

Next we injected an expression vector encoding the PDGF-C gene into ischemic limbs. Blood flow recovery and neovascularization after ischemia were significantly improved in the PDGF-C-treated group compared with the control group.

It has been reported that angiogenic response to ischemia is attenuated in diabetes even after VEGF treatment, although a precise mechanism remains unknown. We hypothesized that PDGF-C might relate to the impaired angiogenesis of diabetes. To test this hypothesis, we created murine model of diabetes by intraperitoneal injection of streptozotocin (STZ). We found that expression levels of PDGF-C at baseline and after ischemia were both significantly lower in limb tissues of diabetic mice than in those of control mice, while expression levels of VEGF and other members of the PDGF family were not changed or even higher in diabetic mice. Unlike in non-diabetic mice, introduction of VEGF gene into ischemic limbs did not improve blood flow recovery in diabetic mice. On the other hand, these changes were effectively reversed by introduction of the PDGF-C gene.

Conclusion These results indicate that down-regulation of PDGF-C expression in limb tissues of diabetic mice contribute to impaired angiogenesis and suggest that introduction of PDGF-C would be a novel strategy for therapeutic angiogenesis, especially when VEGF treatment is ineffective, such as in the diabetic state.

  • angiogenesis
  • diabetes
  • vascular complications
  • © 2013 by American Heart Association, Inc.
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    Abstract 228: Distinct Roles of PDGF-C and VEGF in Impaired Angiogenesis of Diabetes and Its Implication in Therapeutic Angiogenesis
    Junji Moriya and Napoleone Ferrara
    Arteriosclerosis, Thrombosis, and Vascular Biology. 2013;33:A228, originally published October 20, 2015

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    Abstract 228: Distinct Roles of PDGF-C and VEGF in Impaired Angiogenesis of Diabetes and Its Implication in Therapeutic Angiogenesis
    Junji Moriya and Napoleone Ferrara
    Arteriosclerosis, Thrombosis, and Vascular Biology. 2013;33:A228, originally published October 20, 2015
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