Abstract
Background: Transcriptional silencing associated with aberrant promoter methylation has been established as an alternate pathway for the development of cancer by inactivating tumor suppressor genes. TMSI (Target of Methylation induced Silencing), also known as ASC (Apoptosis Speck like protein containing a CARD) is a tumor suppressor gene which encodes for a CARD (caspase recruitment domain) containing regulatory protein and has been shown to promote apoptosis directly and by activation of downstream caspases. This study describes the methylation induced silencing of TMSI/ASC gene in prostate cancer cell lines. We also examined the prevalence of TMSI/ASC gene methylation in prostate cancer tissue samples in an effort to correlate race and clinico-pathological features with TMSI/ASC gene methylation. Results: Loss of TMSI/ASC gene expression associated with complete methylation of the promoter region was observed in LNCaP cells. Gene expression was restored by a demethylating agent, 5-aza-2′deoxycytidine, but not by a histone deacetylase inhibitor, Trichostatin A. Chromatin Immunoprecipitation (ChIP) assay showed enrichment of MBD3 (methyl binding domain protein 3) to a higher degree than commonly associated MBDs and MeCP2. We evaluated the methylation pattern in 66 prostate cancer and 34 benign prostatic hyperplasia tissue samples. TMSI/ASC gene methylation was more prevalent in prostate cancer cases than controls in White patients (OR 7.6, p 0.002) while no difference between the cases and controls was seen in Black patients (OR 1.1, p 0.91). Conclusion: Our study demonstrates that methylation-mediated silencing of TMSI/ASC is a frequent event in prostate cancer, thus identifying a new potential diagnostic and prognostic marker for the treatment of the disease. Racial differences in TMSI/ASC methylation patterns implicate the probable role of molecular markers in determining in susceptibility to prostate cancer in different ethnic groups.
| Original language | English |
|---|---|
| Article number | 28 |
| Journal | Molecular Cancer |
| Volume | 5 |
| DOIs | |
| State | Published - Jul 18 2006 |
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ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Medicine(all)
- Cancer Research
- Molecular Medicine
Cite this
Methylation mediated silencing of TMS1/ASC gene in prostate cancer. / Das, Partha M.; Ramachandran, Kavitha; VanWert, Jane; Ferdinand, Larry; Gopisetty, Gopal; Reis, Isildinha; Singal, Rakesh.
In: Molecular Cancer, Vol. 5, 28, 18.07.2006.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Methylation mediated silencing of TMS1/ASC gene in prostate cancer
AU - Das, Partha M.
AU - Ramachandran, Kavitha
AU - VanWert, Jane
AU - Ferdinand, Larry
AU - Gopisetty, Gopal
AU - Reis, Isildinha
AU - Singal, Rakesh
PY - 2006/7/18
Y1 - 2006/7/18
N2 - Background: Transcriptional silencing associated with aberrant promoter methylation has been established as an alternate pathway for the development of cancer by inactivating tumor suppressor genes. TMSI (Target of Methylation induced Silencing), also known as ASC (Apoptosis Speck like protein containing a CARD) is a tumor suppressor gene which encodes for a CARD (caspase recruitment domain) containing regulatory protein and has been shown to promote apoptosis directly and by activation of downstream caspases. This study describes the methylation induced silencing of TMSI/ASC gene in prostate cancer cell lines. We also examined the prevalence of TMSI/ASC gene methylation in prostate cancer tissue samples in an effort to correlate race and clinico-pathological features with TMSI/ASC gene methylation. Results: Loss of TMSI/ASC gene expression associated with complete methylation of the promoter region was observed in LNCaP cells. Gene expression was restored by a demethylating agent, 5-aza-2′deoxycytidine, but not by a histone deacetylase inhibitor, Trichostatin A. Chromatin Immunoprecipitation (ChIP) assay showed enrichment of MBD3 (methyl binding domain protein 3) to a higher degree than commonly associated MBDs and MeCP2. We evaluated the methylation pattern in 66 prostate cancer and 34 benign prostatic hyperplasia tissue samples. TMSI/ASC gene methylation was more prevalent in prostate cancer cases than controls in White patients (OR 7.6, p 0.002) while no difference between the cases and controls was seen in Black patients (OR 1.1, p 0.91). Conclusion: Our study demonstrates that methylation-mediated silencing of TMSI/ASC is a frequent event in prostate cancer, thus identifying a new potential diagnostic and prognostic marker for the treatment of the disease. Racial differences in TMSI/ASC methylation patterns implicate the probable role of molecular markers in determining in susceptibility to prostate cancer in different ethnic groups.
AB - Background: Transcriptional silencing associated with aberrant promoter methylation has been established as an alternate pathway for the development of cancer by inactivating tumor suppressor genes. TMSI (Target of Methylation induced Silencing), also known as ASC (Apoptosis Speck like protein containing a CARD) is a tumor suppressor gene which encodes for a CARD (caspase recruitment domain) containing regulatory protein and has been shown to promote apoptosis directly and by activation of downstream caspases. This study describes the methylation induced silencing of TMSI/ASC gene in prostate cancer cell lines. We also examined the prevalence of TMSI/ASC gene methylation in prostate cancer tissue samples in an effort to correlate race and clinico-pathological features with TMSI/ASC gene methylation. Results: Loss of TMSI/ASC gene expression associated with complete methylation of the promoter region was observed in LNCaP cells. Gene expression was restored by a demethylating agent, 5-aza-2′deoxycytidine, but not by a histone deacetylase inhibitor, Trichostatin A. Chromatin Immunoprecipitation (ChIP) assay showed enrichment of MBD3 (methyl binding domain protein 3) to a higher degree than commonly associated MBDs and MeCP2. We evaluated the methylation pattern in 66 prostate cancer and 34 benign prostatic hyperplasia tissue samples. TMSI/ASC gene methylation was more prevalent in prostate cancer cases than controls in White patients (OR 7.6, p 0.002) while no difference between the cases and controls was seen in Black patients (OR 1.1, p 0.91). Conclusion: Our study demonstrates that methylation-mediated silencing of TMSI/ASC is a frequent event in prostate cancer, thus identifying a new potential diagnostic and prognostic marker for the treatment of the disease. Racial differences in TMSI/ASC methylation patterns implicate the probable role of molecular markers in determining in susceptibility to prostate cancer in different ethnic groups.
UR - http://www.scopus.com/inward/record.url?scp=33747359590&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33747359590&partnerID=8YFLogxK
U2 - 10.1186/1476-4598-5-28
DO - 10.1186/1476-4598-5-28
M3 - Article
C2 - 16848908
AN - SCOPUS:33747359590
VL - 5
JO - Molecular Cancer
JF - Molecular Cancer
SN - 1476-4598
M1 - 28
ER -