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Updated: Apr 1, 2026
MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
Published on: May 16, 2012
Frequent down-regulation of ABC transporter genes in prostate cancer
Rita Demidenko1, Deividas Razanauskas2, Kristina Daniunaite3
1Division of Human Genome Research Centre, Faculty of Nature Sci., Vilnius University, Ciurlionio 21, Vilnius, LT-03101, Lithuania. rita.demidenko@gmail.com.
Background:
ATP-binding cassette (ABC) transporters are transmembrane proteins responsible for the efflux of a wide variety of substrates, including steroid metabolites, through the cellular membranes. For better characterization of the role of ABC transporters in prostate cancer (PCa) development, the profile of ABC transporter gene expression was analyzed in PCa and noncancerous prostate tissues (NPT).
Methods:
TaqMan Low Density Array (TLDA) human ABC transporter plates were used for the gene expression profiling in 10 PCa and 6 NPT specimens. ABCB1 transcript level was evaluated in a larger set of PCa cases (N = 78) and NPT (N = 15) by real-time PCR, the same PCa cases were assessed for the gene promoter hypermethylation by methylation-specific PCR.
Results:
Expression of eight ABC transporter genes (ABCA8, ABCB1, ABCC6, ABCC9, ABCC10, ABCD2, ABCG2, and ABCG4) was significantly down-regulated in PCa as compared to NPT, and only two genes (ABCC4 and ABCG1) were up-regulated. Down-regulation of ABC transporter genes was prevalent in the TMPRSS2-ERG-negative cases. A detailed analysis of ABCB1 expression confirmed TLDA results: a reduced level of the transcript was identified in PCa in comparison to NPT (p = 0.048). Moreover, the TMPRSS2-ERG-negative PCa cases showed significantly lower expression of ABCB1 in comparison to NPT (p = 0.003) or the fusion-positive tumors (p = 0.002). Promoter methylation of ABCB1 predominantly occurred in PCa and was rarely detected in NPT (p < 0.001).
Conclusions:
The study suggests frequent down-regulation of the ABC transporter genes in PCa, especially in the TMPRSS2-ERG-negative tumors.
Insights
ATP-binding cassette (ABC) transporters are frequently down-regulated in prostate cancer (PCa), particularly in TMPRSS2-ERG-negative tumors. This suggests a potential role for ABC transporter gene expression in PCa development and progression.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- ATP-binding cassette (ABC) transporters are crucial transmembrane proteins involved in substrate efflux.
- Their role in prostate cancer (PCa) development necessitates a detailed analysis of their gene expression profiles.
Purpose of the Study:
- To investigate the gene expression profile of ABC transporters in prostate cancer (PCa) and non-cancerous prostate tissues (NPT).
- To identify specific ABC transporter genes altered in PCa and their correlation with tumor characteristics, such as TMPRSS2-ERG fusion status.
Main Methods:
- Gene expression profiling of ABC transporters was performed using TaqMan Low Density Array (TLDA) on PCa and NPT specimens.
- Real-time PCR was employed to validate ABCB1 transcript levels in a larger cohort.
- Methylation-specific PCR assessed ABCB1 promoter hypermethylation in PCa and NPT.
Main Results:
- Eight ABC transporter genes (ABCA8, ABCB1, ABCC6, ABCC9, ABCC10, ABCD2, ABCG2, ABCG4) were significantly down-regulated in PCa compared to NPT.
- ABCB1 transcript levels were reduced in PCa, with significantly lower expression in TMPRSS2-ERG-negative cases.
- Promoter hypermethylation of ABCB1 was predominantly observed in PCa tissues.
Conclusions:
- Prostate cancer is characterized by frequent down-regulation of ABC transporter genes.
- The down-regulation is particularly pronounced in TMPRSS2-ERG-negative PCa, suggesting a specific mechanism involving these tumors.
- ABCB1 gene expression and its promoter methylation status are significantly altered in PCa.
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