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Increased Expression of the Acid Sphingomyelinase-Like Protein ASML3a in Bladder Tumors

2002; Lippincott Williams & Wilkins; Volume: 168; Issue: 6 Linguagem: Inglês

10.1016/s0022-5347(05)64236-x

1527-3792

Kate O. Wright, Edward M. Messing, Jay E. Reeder,

Endoplasmic Reticulum Stress and Disease

No AccessJournal of UrologyINVESTIGATIVE UROLOGY1 Dec 2002Increased Expression of the Acid Sphingomyelinase-Like Protein ASML3a in Bladder Tumors KATE O. WRIGHT, EDWARD M. MESSING, and JAY E. REEDER KATE O. WRIGHTKATE O. WRIGHT More articles by this author , EDWARD M. MESSINGEDWARD M. MESSING More articles by this author , and JAY E. REEDERJAY E. REEDER More articles by this author View All Author Informationhttps://doi.org/10.1016/S0022-5347(05)64236-XAboutFull TextPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract Purpose: The function of the tumor suppressor gene DBCCR1 (deleted in bladder cancer chromosome region 1) is unknown despite data supporting an important role for DBCCR1 in bladder tumorigenesis. DBCCR1 has not yet been placed in a protein family or functional pathway. Protein-protein interactions are crucial for almost every aspect of cellular function. We hypothesized that the discovery of DBCCR1 protein binding partners would yield important clues for solving the mystery of DBCCR1 function. Materials and Methods: We used the yeast 2-hybrid system to screen an adult human bladder cDNA library for DBCCR1 interacting proteins. Results: In the screen ASML3a (acid sphingomyelinase-like phosphodiesterase 3a) was identified as a novel DBCCR1 binding partner. Transient transfection of bladder tumor cell lines showed that DBCCR1 over expression in human bladder tumor cells results in the up-regulation of ASML3a RNA and protein expression. ASML3a protein was also differentially expressed in 8 of 12 bladder tumors relative to corresponding normal urothelial tissue. Conclusions: It appears that DBCCR1 and ASML3a are involved in the process of bladder tumorigenesis. Their interaction may provide clues to discern their functions. References 1 : Initiation of bladder cancer may involve deletion of a tumour-suppressor gene on chromosome 9. 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