Enhancing engineered vascular networks in vitro and in vivo: The effects of IGF1 on vascular development and durability.

Abstract:

OBJECTIVES:Creation of functional, durable vasculature remains an important goal within the field of regenerative medicine. Engineered biological vasculature has the potential to restore or improve human tissue function. We hypothesized that the pleotropic effects of insulin-like growth factor 1 (IGF1) would enhance the engineering of capillary-like vasculature. MATERIALS AND METHODS:The impact of IGF1 upon vasculogenesis was examined in in vitro cultures for a period of up to 40 days and as subcutaneous implants within immunodeficient mice. Co-cultures of human umbilical vein endothelial cells and human bone marrow-derived mesenchymal stem cells in collagen-fibronectin hydrogels were supplemented with either recombinant IGF1 protein or genetically engineered cells to provide sustained IGF1. Morphometric analysis was performed on the vascular networks that formed in four concentrations of IGF1. RESULTS:IGF1 supplementation significantly enhanced de novo vasculogenesis both in vitro and in vivo. Effects were long-term as they lasted the duration of the study period, and included network density, vessel length, and diameter. Bifurcation density was not affected. However, the highest concentrations of IGF1 tested were either ineffective or even deleterious. Sustained IGF1 delivery was required in vivo as the inclusion of recombinant IGF1 protein had minimal impact. CONCLUSION:IGF1 supplementation can be used to produce neovasculature with significantly enhanced network density and durability. Its use is a promising methodology for engineering de novo vasculature to support regeneration of functional tissue.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Friedrich CC,Lin Y,Krannich A,Wu Y,Vacanti JP,Neville CM

doi

10.1111/cpr.12387

subject

Has Abstract

pub_date

2018-02-01 00:00:00

issue

1

eissn

0960-7722

issn

1365-2184

journal_volume

51

pub_type

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