title: In vitro study of cell-promoting multiple-armed peptides.
abstract: The purpose of this study was to compare the effectiveness of several linear and branch cell-binding peptides to promote cell growth in prosthetic vascular grafts. In this in vitro study, the peptides were covalently immobilized onto expanded polytetrafluoroethylene (ePTFE) vascular grafts. Cell-growth properties were studied using primary human umbilical vein endothelial cells (HUVECs) and primary human umbilical artery smooth muscle cells (HUASMCs). Linear peptides (P15 and P15') and multiple-armed peptides (MAP4-I and MAP4-II) were covalently bonded onto ePTFE grafts by an atmospheric plasma coating method. X-ray photoelectron spectroscopy and amino acid analysis were used to analyze the surface characteristics of the peptide-coated samples. Cell adhesion, proliferation, and morphology were evaluated by culturing HUVECs and HUASMCs onto the surfaces of different samples: ePTFE control, chemically activated ePTFE, P15-coated ePTFE, and MAP4-coated ePTFE. The cell culture experiments were repeated several times to obtain statistically reliable cell-growth data. Cell-growth data were statistically analyzed by the two-way statistical analysis of variance. The study showed that multiple-armed MAP4 peptides were significantly more effective in promoting endothelial cells than the structurally similar linear P15 peptides. There were 800% more HUVECs proliferated on the MAP4-coated ePTFE samples compared with the ePTFE control. MAP4 peptides were 80% more effective for promoting HUVECs than P15 peptides. In contrast, MAP4 peptides were significantly less effective for promoting HUASMCs than HUVECs. There were only about 100% more HUASMCs proliferated on the MAP4-coated ePTFE samples compared with the ePTFE control. MAP4 and P15 peptides had similar cell-promoting characteristics for SMCs.
authors.affiliation: InCube, Inc., 1390 Willow Road, Menlo Park, California 94025, USA. cheng@in-cube.com
authors.forename: Cheng
authors.initials: C
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.forename: Mir
authors.initials: M
authors.lastname: Imran
mesh_terms: D000595:Amino Acid Sequence; D001672:Biocompatible Materials / Q000737:chemistry / Q000378:metabolism; D002448:Cell Adhesion; D049109:Cell Proliferation; D048430:Cell Shape; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology / Q000378:metabolism; D006801:Humans; D008422:Materials Testing; D008969:Molecular Sequence Data; D015394:Molecular Structure; D032389:Myocytes, Smooth Muscle / Q000166:cytology / Q000378:metabolism; D010455:Peptides / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011138:Polytetrafluoroethylene / Q000737:chemistry* / Q000378:metabolism; D013057:Spectrum Analysis / Q000379:methods; D019737:Transplants
chemical_list: D001672:Biocompatible Materials; D010455:Peptides; D011138:Polytetrafluoroethylene