title: Inverted colloidal crystals as three-dimensional cell scaffolds.
abstract: A new type of three-dimensional scaffold with inverted colloidal crystal geometry for the investigation of topological effects in cell cultures is introduced in this publication. The scaffolds are made by infiltration of the hexagonal crystal lattice of polystyrene spheres with sol-gel formulation and subsequent annealing. It possesses a relatively high degree of order among existing cell scaffolds and affords tight control over the scaffold porosity and tissue organization. The prepared scaffolds can be a convenient system for the investigation of cell-cell and cell-matrix interactions. Their biocompatibility is demonstrated for human hepatocellular carcinoma HEP G2 and human bone marrow HS-5 cell cultures. A preliminary effect of the scaffold topology on cell proliferation is observed. HEP G2 hepatocytes form a large number of 10-15 cell colonies on scaffolds made from 75-microm spheres, while their number diminishes for scaffolds from 10- and 160-microm spheres. Under similar conditions, HS-5 forms smaller colonies consisting of three to four cells in 90-microm cavities.
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Kotov
authors.forename: Yuanfang
authors.initials: Y
authors.lastname: Liu
authors.forename: Shaopeng
authors.initials: S
authors.lastname: Wang
authors.forename: Colin
authors.initials: C
authors.lastname: Cumming
authors.forename: Mohammad
authors.initials: M
authors.lastname: Eghtedari
authors.forename: Gracie
authors.initials: G
authors.lastname: Vargas
authors.forename: Massoud
authors.initials: M
authors.lastname: Motamedi
authors.forename: Joan
authors.initials: J
authors.lastname: Nichols
authors.forename: Joaquin
authors.initials: J
authors.lastname: Cortiella
mesh_terms: D001854:Bone Marrow Cells / Q000737:chemistry*; D006528:Carcinoma, Hepatocellular / Q000737:chemistry*; D018929:Cell Culture Techniques / Q000379:methods; D002460:Cell Line; D045744:Cell Line, Tumor; D002478:Cells, Cultured; D003102:Colloids / Q000737:chemistry*; D003460:Crystallization; D006801:Humans; D008113:Liver Neoplasms / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011137:Polystyrenes / Q000737:chemistry; D013499:Surface Properties; D014407:Tumor Cells, Cultured
chemical_list: D003102:Colloids; D011137:Polystyrenes