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Increased expression of the acid sphingomyelinase-like protein ASML3a in bladder tumors
Kate O Wright1, Edward M Messing, Jay E Reeder
1Department of Pathology, University of Rochester, New York, USA.
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.
Insights
The tumor suppressor gene DBCCR1 (deleted in bladder cancer chromosome region 1) interacts with ASML3a. This discovery offers insights into their roles in bladder cancer development and function.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The function of the tumor suppressor gene DBCCR1 (deleted in bladder cancer chromosome region 1) remains unknown.
- DBCCR1's role in bladder tumorigenesis is supported by data, but it lacks defined protein family or functional pathway classification.
- Protein-protein interactions are fundamental to cellular functions, making the identification of DBCCR1 binding partners crucial for understanding its role.
Purpose of the Study:
- To identify DBCCR1 protein binding partners to elucidate its function.
- To investigate the functional significance of DBCCR1 in bladder cancer.
Main Methods:
- Yeast two-hybrid system screening of an adult human bladder cDNA library.
- Identification of DBCCR1 interacting proteins.
Main Results:
- Acid sphingomyelinase-like phosphodiesterase 3a (ASML3a) was identified as a novel DBCCR1 binding partner.
- DBCCR1 overexpression up-regulates ASML3a RNA and protein expression in human bladder tumor cell lines.
- ASML3a protein showed differential expression in 8 out of 12 bladder tumors compared to normal urothelial tissue.
Conclusions:
- DBCCR1 and ASML3a appear to be involved in bladder tumorigenesis.
- The interaction between DBCCR1 and ASML3a may provide critical clues to their respective functions in cancer development.