title: Ibuprofen inhibits survival of bladder cancer cells by induced expression of the p75NTR tumor suppressor protein.
abstract: Nonsteroidal anti-inflammatory drugs (NSAIDs) are used to reduce inflammation and as analgesics by inhibition of cyclooxygenase-2. At higher concentrations, some NSAIDs inhibit proliferation and induce apoptosis of cancer cells. Although several molecular mechanisms have been postulated to explain the anticancer effects of NSAIDs, they do not involve merely the inhibition of cyclooxygenase-2, and a more proximate initiator molecule may be regulated by NSAIDs to inhibit growth. The p75 neurotrophin receptor (p75NTR) is a proximate cell membrane receptor glycoprotein that has been identified as a tumor and metastasis suppressor. We observed that NSAID treatment of cell lines from bladder and other organs induced expression of the p75NTR protein. Of the different types of NSAIDs examined, ibuprofen was more efficacious than aspirin and acetaminophen and comparable with (R)-flurbiprofen and indomethacin in induction of p75NTR protein expression. This rank order NSAID induction of the p75NTR protein correlated with the ability of these NSAIDs to reduce cancer cell survival. To examine a mechanistic relationship between ibuprofen induction of p75NTR protein and inhibition of survival, bladder cancer cells were transfected with ponasterone A-inducible vectors that expressed a death domain-deleted (DeltaDD) or intracellular domain-deleted (DeltaICD) p75NTR product that acts as a dominant negative antagonist of the intact p75NTR protein. Expression of DeltaDD and DeltaICD rescued cells from ibuprofen inhibition of growth. These observations suggest that p75NTR is an important upstream modulator of the anticancer effects of NSAIDs and that ibuprofen induction of the p75NTR protein establishes an alternate mechanism by which ibuprofen may exert an anticancer effect.
authors.affiliation: Department of Cell Biology, Georgetown University Medical Center, Washington, DC 20057-1436, USA.
authors.forename: Fatima
authors.initials: F
authors.lastname: Khwaja
authors.forename: Jeff
authors.initials: J
authors.lastname: Allen
authors.forename: John
authors.initials: J
authors.lastname: Lynch
authors.forename: Peter
authors.initials: P
authors.lastname: Andrews
authors.forename: Daniel
authors.initials: D
authors.lastname: Djakiew
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D002295:Carcinoma, Transitional Cell / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism; D002352:Carrier Proteins / Q000096:biosynthesis* / Q000235:genetics; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D006801:Humans; D007052:Ibuprofen / Q000494:pharmacology*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000235:genetics; D017978:Receptors, Growth Factor; D017475:Receptors, Nerve Growth Factor; D014162:Transfection; D001749:Urinary Bladder Neoplasms / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002352:Carrier Proteins; C484065:NGFR protein, human; D009419:Nerve Tissue Proteins; D017978:Receptors, Growth Factor; D017475:Receptors, Nerve Growth Factor; D007052:Ibuprofen