title: Synthesis of nanoscale TiO2 and study of the effect of their crystal structure on single cell response.
abstract: To study the effect of nanoscale titanium dioxide (TiO(2)) on cell responses, we synthesized four modifications of the TiO(2) (amorphous, anatase, brookite, and rutile) capable of keeping their physicochemical characteristics in a cell culture medium. The modifications of nanoscale TiO(2) were obtained by hydrolysis of TiCl(4) and Ti(i-OC(3)H(7))(4) (TIP) upon variation of the synthesis conditions; their textural, morphological, structural, and dispersion characteristics were examined by a set of physicochemical methods: XRD, BET, SAXS, DLS, AFM, SEM, and HR-TEM. The effect of synthesis conditions (nature of precursor, pH, temperature, and addition of a complexing agent) on the structural-dispersion properties of TiO(2) nanoparticles was studied. The hydrolysis methods providing the preparation of amorphous, anatase, brookite, and rutile modifications of TiO(2) nanoparticles 3-5 nm in size were selected. Examination of different forms of TiO(2) nanoparticles interaction with MDCK cells by transmission electron microscopy of ultrathin sections revealed different cell responses after treatment with different crystalline modifications and amorphous form of TiO(2). The obtained results allowed us to conclude that direct contact of the nanoparticles with cell plasma membrane is the primary and critical step of their interaction and defines a subsequent response of the cell.
authors.affiliation: Boreskov Institute of Catalysis, Siberian Branch of RAS, 5 Pr. Akad. Lavrentieva, Novosibirsk, Russia. zri@catalysis.ru
authors.forename: Z R
authors.initials: ZR
authors.lastname: Ismagilov
authors.forename: N V
authors.initials: NV
authors.lastname: Shikina
authors.forename: N A
authors.initials: NA
authors.lastname: Mazurkova
authors.forename: L T
authors.initials: LT
authors.lastname: Tsikoza
authors.forename: F V
authors.initials: FV
authors.lastname: Tuzikov
authors.forename: V A
authors.initials: VA
authors.lastname: Ushakov
authors.forename: A V
authors.initials: AV
authors.lastname: Ishchenko
authors.forename: N A
authors.initials: NA
authors.lastname: Rudina
authors.forename: D V
authors.initials: DV
authors.lastname: Korneev
authors.forename: E I
authors.initials: EI
authors.lastname: Ryabchikova
mesh_terms: D000818:Animals; D002460:Cell Line; D002462:Cell Membrane / Q000187:drug effects; D004285:Dogs; D007668:Kidney / Q000166:cytology / Q000378:metabolism; D053768:Metal Nanoparticles / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D053838:Scattering, Small Angle; D014025:Titanium / Q000494:pharmacology*; D014961:X-Ray Diffraction
chemical_list: C009495:titanium dioxide; D014025:Titanium