Abstract:
:Extensive hypermethylation and consecutive transcriptional silencing of tumorsuppressor genes have been documented in multiple tumor entities including breast cancer. In a microarray based genome-wide methylation analysis of five sporadic breast carcinomas we identified a hypermethylated CpG island within the first intron of the prospero related homeobox gene 1 (PROX1). We, therefore, investigated CpG island methylation of PROX1 in a series of 33 pairs of primary breast cancer and corresponding normal tissue samples by bisulfite sequencing and COBRA analyses. Seventeen of these (52%) breast cancer samples revealed a significant accumulation of methylated CpG sites along with a significant reduction of PROX1 transcription compared to normal breast tissues of the same patients. Frequent methylation was also observed in brain metastases from primary breast cancer (21/37 = 57% of cases). Secondary, we analysed 38 brain metastases of primary breast carcinomas and detected a significantly reduced expression of PROX1 compared to normal breast tissue (p < 0.001) and primary breast carcinomas (p < 0.05), respectively. Additionally, treatment of breast cancer cell lines with demethylating agents could reactivate PROX1 transcription. In summary, we have identified PROX1 as a novel target gene that is hypermethylated and transcriptionally silenced in primary and metastatic breast cancer.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Versmold B,Felsberg J,Mikeska T,Ehrentraut D,Köhler J,Hampl JA,Röhn G,Niederacher D,Betz B,Hellmich M,Pietsch T,Schmutzler RK,Waha Adoi
10.1002/ijc.22705subject
Has Abstractpub_date
2007-08-01 00:00:00pages
547-54issue
3eissn
0020-7136issn
1097-0215journal_volume
121pub_type
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