title: Microcollimator for micrometer-wide stripe irradiation of cells using 20-30 keV X rays.
abstract: Abstract Pataky, K., Villanueva, G., Liani, A., Zgheib, O., Jenkins, N., Halazonetis, D. J., Halazonetis, T. D. and Brugger, J. Microcollimator for Micrometer-Wide Stripe Irradiation of Cells Using 20-30 keV X Rays. Radiat. Res. 172, 252-259 (2009). The exposure of subnuclear compartments of cells to ionizing radiation is currently not trivial. We describe here a collimator for micrometer-wide stripe irradiation designed to work with conventional high-voltage X-ray tubes and cells cultured on standard glass cover slips. The microcollimator was fabricated by high-precision silicon micromachining and consists of X-ray absorbing chips with grooves of highly controlled depths, between 0.5-10 microm, along their surfaces. These grooves form X-ray collimating slits when the chips are stacked against each other. The use of this device for radiation biology was examined by irradiating human cells with X rays having energies between 20-30 keV. After irradiation, p53 binding protein 1 (53BP1), a nuclear protein that is recruited at sites of DNA double-strand breaks, clustered in lines corresponding to the irradiated stripes.
authors.affiliation: Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland.
authors.forename: Kristopher
authors.initials: K
authors.lastname: Pataky
authors.forename: Guillermo
authors.initials: G
authors.lastname: Villanueva
authors.forename: Andre
authors.initials: A
authors.lastname: Liani
authors.forename: Omar
authors.initials: O
authors.lastname: Zgheib
authors.forename: Nathan
authors.initials: N
authors.lastname: Jenkins
authors.forename: Demetrios J
authors.initials: DJ
authors.lastname: Halazonetis
authors.forename: Thanos D
authors.initials: TD
authors.lastname: Halazonetis
authors.forename: Juergen
authors.initials: J
authors.lastname: Brugger
mesh_terms: D018929:Cell Culture Techniques / Q000295:instrumentation* / Q000379:methods; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008904:Miniaturization; D012516:Osteosarcoma / Q000503:physiopathology*; D011829:Radiation Dosage; D055618:Radiation Equipment and Supplies; D014965:X-Rays