title: The effect of cell cycle synchronization on tumor sensitivity to reovirus oncolysis.
abstract: The potential for increased sensitivity of tumor cells to oncolytic reovirus by altering the normal cell cycle using clinically available pharmacological agents was investigated. B16.F10 mouse melanoma cells were partially synchronized with hydroxyurea, thymidine, or by mitotic shake-off. Cell survival was determined using MTS [3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)- 2-(4-sulfophenyl)-2H-tetrazolium)] survival assay and virus yield in tumors by plaque assay. An enhanced sensitivity to reovirus was observed following the removal of either hydroxyurea or thymidine from the culture medium (P < 0.0001). The greatest survival difference compared to normal cycling cells was noted when the majority of cells were in S and G2/M phases, and was associated with increased viral replication. Cells collected by mitotic shake-off were nearly devoid of cells in S phase and were less susceptible to reovirus-induced cell kill than their nonsynchronized counterparts (P < 0.0001). In vivo combination of hydroxyurea followed by intratumoral reovirus resulted in reduced tumor growth and increased survival compared to monotherapy (P = 0.0041) at 15 days. Increased amounts of virus were retrieved from tumors from mice treated with sequential hydroxyurea/reovirus compared to concomitant treatment or reovirus monotherapy. These data justify clinical evaluation of this approach supported by the extensive experience, low cost, simple administration, and availability of hydroxyurea.
authors.affiliation: Oncology, Postgraduate Medical School, University of Surrey, Guildford, UK.
authors.forename: Lucy
authors.initials: L
authors.lastname: Heinemann
authors.forename: Guy R
authors.initials: GR
authors.lastname: Simpson
authors.forename: Nicola E
authors.initials: NE
authors.lastname: Annels
authors.forename: Richard
authors.initials: R
authors.lastname: Vile
authors.forename: Alan
authors.initials: A
authors.lastname: Melcher
authors.forename: Robin
authors.initials: R
authors.lastname: Prestwich
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Harrington
authors.forename: Hardev S
authors.initials: HS
authors.lastname: Pandha
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D002453:Cell Cycle / Q000187:drug effects / Q000502:physiology*; D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D004195:Disease Models, Animal; D005347:Fibroblasts / Q000166:cytology; D006918:Hydroxyurea / Q000494:pharmacology; D008545:Melanoma / Q000628:therapy*; D051379:Mice; D008810:Mice, Inbred C57BL; D050130:Oncolytic Virotherapy; D012087:Reoviridae; D014779:Virus Replication
chemical_list: D000970:Antineoplastic Agents; D006918:Hydroxyurea