title: Biomaterial topography alters healing in vivo and monocyte/macrophage activation in vitro.
abstract: The effect of biomaterial topography on healing in vivo and monocyte/macrophage stimulation in vitro was assessed. A series of expanded polytetrafluoroethylene (ePTFE) materials were characterized by increasing average intranodal distance of 1.2 μm (1.2-ePTFE), 3.0 μm (3.0-ePTFE), and 4.4 μm (4.4-ePTFE), but presented consistent surface chemistry with nonporous PTFE (np-PTFE). Subcutaneous implantation of 4.4-ePTFE into mice resulted in a statistically thinner capsule that appeared less organized and less dense than the np-PTFE response. In vitro, isolated monocytes/macrophages cultured on np-PTFE produced low levels of interleukin 1-beta (IL-1β), 1.2-ePTFE and 3.0-ePTFE stimulated intermediate levels, and 4.4-ePTFE stimulated a 15-fold increase over np-PTFE. Analysis of cDNA microarrays demonstrated that additional proinflammatory cytokines and chemokines, including IL-1β, interleukin 6, tumor necrosis factor alpha, monocyte chemotactic protein 1, and macrophage inflammatory protein 1-beta, were expressed at higher levels by monocytes/macrophages cultured on 4.4-ePTFE at 4 and 24 h, respectively. Expression ratios for several genes were quantified by RT-PCR and were consistent with those from the cDNA array results. These results demonstrate the effect of biomaterial topography on early proinflammatory cytokine production and gene transcription by monocytes/macrophages in vitro and decreased fibrous capsule thickness in vivo.
authors: Department of Bioengineering, University of Washington, Seattle, Washington 98195, USA.
authors: Paige C S
authors: PC
authors: Bota
authors: Angela M B
authors: AM
authors: Collie
authors: Pauli
authors: P
authors: Puolakkainen
authors: Robert B
authors: RB
authors: Vernon
authors: E Helene
authors: EH
authors: Sage
authors: Buddy D
authors: BD
authors: Ratner
authors: Patrick S
authors: PS
authors: Stayton
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000378:metabolism; D002478:Cells, Cultured; D018925:Chemokines / Q000235:genetics / Q000378:metabolism; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D008262:Macrophage Activation; D008264:Macrophages / Q000166:cytology / Q000502:physiology*; D008297:Male; D008422:Materials Testing; D051379:Mice; D009000:Monocytes / Q000166:cytology / Q000502:physiology*; D020411:Oligonucleotide Array Sequence Analysis; D011138:Polytetrafluoroethylene / Q000737:chemistry / Q000378:metabolism; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D018925:Chemokines; D016207:Cytokines; D036341:Intercellular Signaling Peptides and Proteins; D011138:Polytetrafluoroethylene