title: Efficient induction of apoptosis by ONYX-015 adenovirus in human colon cancer cell lines regardless of p53 status.
abstract: The ONYX-015 virus is a mutated adenovirus that in theory selectively replicates and induces cytolysis in tumor cells lacking functional p53. The present study investigated whether ONYX-015 viral infection alone or in combination with conventional chemotherapeutic agents could significantly increase apoptosis in human colon cancer cell lines, regardless of p53 status, compared to untreated cells. A pair of colon cancer cell lines that differ only in their p53 status (RKO with wild-type p53 and RKOp53 with deficient p53) was tested. Two chemotherapeutic agents, 5-fluorouracil (5-FU) and CPT-11, were tested in combination with ONYX-015. Final concentrations of these agents corresponded to peak plasma levels achievable in patients. ONYX-015 concentration was 10 p.f.u./cell. In RKO and RKOp53 cell lines, ONYX-015 viral infection alone or in combination with 5-FU or CPT-11 induced a significant increase in apoptosis compared to chemotherapeutic agents alone, regardless of p53 status. Moreover, the combination of ONYX-015 and chemotherapeutics induced more apoptosis than chemotherapeutics alone in the two colon cancer cell lines independently of their p53 status. We conclude that ONYX-015 virus infection alone or in combination with 5-FU or CPT-11 induced apoptosis in human colon cancer cell lines, independently of p53 status.
authors.affiliation: Molecular Targets Laboratory, Institute for Drug Development, Cancer Therapy and Research Center, San Antonio, TX 78245-3217, USA.
authors.forename: T
authors.initials: T
authors.lastname: Petit
authors.forename: K K
authors.initials: KK
authors.lastname: Davidson
authors.forename: C
authors.initials: C
authors.lastname: Cerna
authors.forename: R A
authors.initials: RA
authors.lastname: Lawrence
authors.forename: D D
authors.initials: DD
authors.lastname: Von Hoff
authors.forename: C
authors.initials: C
authors.lastname: Heise
authors.forename: D
authors.initials: D
authors.lastname: Kirn
authors.forename: E
authors.initials: E
authors.lastname: Izbicka
mesh_terms: D000256:Adenoviridae / Q000502:physiology*; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis; D002166:Camptothecin / Q000031:analogs & derivatives / Q000494:pharmacology; D003110:Colonic Neoplasms / Q000378:metabolism / Q000473:pathology / Q000821:virology*; D003131:Combined Modality Therapy; D005472:Fluorouracil / Q000494:pharmacology; D006801:Humans; D000077146:Irinotecan; D009154:Mutation; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism / Q000821:virology; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D000970:Antineoplastic Agents; D016159:Tumor Suppressor Protein p53; D000077146:Irinotecan; D005472:Fluorouracil; D002166:Camptothecin