title: tNOX is both necessary and sufficient as a cellular target for the anticancer actions of capsaicin and the green tea catechin (-)-epigallocatechin-3-gallate.
abstract: Capsaicin and the principal green tea catechin, (-)-epigallocatechin-3-gallate (EGCg), target tNOX, a tumor (cancer)-specific surface hydroquinone (NADH) oxidase with protein disulfide-thiol interchange activity (ECTO-NOX protein). Accordingly vector-forced over expression of tNOX in MCF-10A mammary epithelia or COS cells that lack tNOX or in COS cells that underexpress tNOX enhanced the susceptibility of growth and apoptosis to both EGCg and capsaicin. Additionally, the tNOX-transfected MCF-10A cells proliferated in Matrigel, a measure of invasiveness. In contrast, oligomeric antisense tNOX DNA abrogated growth inhibition by EGCg and capsaicin and reduced anchorage-dependent growth of HeLa (human cervical carcinoma) cells that naturally overexpress tNOX. The findings show cell surface expression of tNOX as both necessary and sufficient for the cellular anticancer activities attributed to both EGCg and capsaicin.
authors.affiliation: Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: Pin-Ju
authors.initials: PJ
authors.lastname: Chueh
authors.forename: Lian-Ying
authors.initials: LY
authors.lastname: Wu
authors.forename: Dorothy M
authors.initials: DM
authors.lastname: Morré
authors.forename: D James
authors.initials: DJ
authors.lastname: Morré
mesh_terms: D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001940:Breast; D019556:COS Cells; D002211:Capsaicin / Q000494:pharmacology*; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002522:Chlorocebus aethiops; D006367:HeLa Cells; D006801:Humans; D007668:Kidney; D007700:Kinetics; D009247:NADH, NADPH Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D013662:Tea; D014162:Transfection
chemical_list: D016588:Anticarcinogenic Agents; D000970:Antineoplastic Agents; D013662:Tea; D002392:Catechin; C045651:epigallocatechin gallate; D009247:NADH, NADPH Oxidoreductases; C431909:tumor-associated NADH oxidase; D002211:Capsaicin