title: Long-term adaptation of breast tumor cell lines to high concentrations of nitric oxide.
abstract: Nitric oxide (NO), a free radical, has been implicated in the biology of human cancers, including breast cancer, yet it is still unclear how NO affects tumor development and propagation. We herein gradually adapted four human breast adenocarcinoma cell lines (BT-20, Hs578T, T-47D, and MCF-7) to increasing concentrations of the NO donor DETA-NONOate up to 600 muM. The resulting model system consisted of a set of fully adapted high nitric oxide ("HNO") cell lines that are biologically different from the "parent" cell lines from which they originated. Although each of the four parent and HNO cell lines had identical morphologic appearance, the HNO cells grew faster than their corresponding parent cells and were resistant to both nitrogen- and oxygen-based free radicals. These cell lines serve as a novel tool to study the role of NO in breast cancer progression and potentially can be used to predict the therapeutic response leading to more efficient therapeutic regimens.
authors.affiliation: Center for Molecular Biology of Oral Diseases, College of Dentistry, University of Illinois at Chicago, 801 S. Paulina St., Chicago, IL 60612, USA.
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Vesper
authors.forename: Kim M
authors.initials: KM
authors.lastname: Elseth
authors.forename: Gabor
authors.initials: G
authors.lastname: Tarjan
authors.forename: G Kenneth
authors.initials: GK
authors.lastname: Haines
authors.forename: James A
authors.initials: JA
authors.lastname: Radosevich
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects*; D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology*; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002470:Cell Survival / Q000187:drug effects; D005260:Female; D006801:Humans; D006861:Hydrogen Peroxide / Q000633:toxicity; D009569:Nitric Oxide / Q000378:metabolism; D020030:Nitric Oxide Donors / Q000494:pharmacology*; D009603:Nitroso Compounds / Q000494:pharmacology*
chemical_list: D020030:Nitric Oxide Donors; D009603:Nitroso Compounds; C094210:2,2'-(hydroxynitrosohydrazono)bis-ethanamine; D009569:Nitric Oxide; D006861:Hydrogen Peroxide