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Kluth M, Scherzai S, Büschek F, Fraune C, Möller K, Höflmayer D, Minner S, Göbel C, Möller-Koop C, Hinsch A, Neubauer E, Tsourlakis MC, Sauter G, Heinzer H, Graefen M, Wilczak W, Luebke AM, Burandt E, Steurer S, Schlomm T, Simon R. 13q deletion is linked to an adverse phenotype and poor prognosis in prostate cancer. Genes Chromosomes Cancer 2018; 57:504-512. [PMID: 29923647 DOI: 10.1002/gcc.22645] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 05/23/2018] [Accepted: 05/24/2018] [Indexed: 01/13/2023] Open
Abstract
Deletions of chromosome arm 13q belong to the most frequent molecular alterations in prostate cancer. To better understand the role of 13q deletion in prostate cancer we took advantage of our large prostate cancer tissue microarray comprising more than 12 000 cancer samples with full pathological and clinical follow-up data. Fluorescence in situ hybridization with probes for ENOX1 (13q14.11) and the retinoblastoma gene (RB1, 13q14.2) was employed. A 13q deletion was found in 21% of 7375 analyzable cancers. Deletions were always heterozygous and associated with high Gleason grade (P < .0001), advanced tumor stage (P < .0001), high preoperative prostate-specific antigen (PSA) levels (P = .0125), lymph node metastasis (P = .0377), positive resection margin (P = .0064), and early biochemical recurrence (P < .0001). 13q deletions were marginally more frequent in prostate cancers with negative ERG status (22.9%) than in ERG-positive tumors (18.7%; P < .0001). Loss of 13q predicted patient prognosis independently from established prognostic parameters that are available at the time of biopsy (P = .0004), including preoperative PSA level, clinical tumor stage, and biopsy Gleason grade. In summary, the results of our study identify 13q deletion as a frequent event in prostate cancer, which is linked to an adverse phenotype and poor prognosis in this disease.
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Affiliation(s)
- Martina Kluth
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Sekander Scherzai
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Franziska Büschek
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Christoph Fraune
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Katharina Möller
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Doris Höflmayer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Sarah Minner
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Cosima Göbel
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | | | - Andrea Hinsch
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Emily Neubauer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | | | - Guido Sauter
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Hans Heinzer
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Germany
| | - Markus Graefen
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Germany
| | - Waldemar Wilczak
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Andreas M Luebke
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Eike Burandt
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Stefan Steurer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
| | - Thorsten Schlomm
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Germany.,Department of Urology, Section for Prostate Cancer Research, University Medical Center Hamburg-Eppendorf, Germany.,Department of Urology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Ronald Simon
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Germany
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Zidan HE, Abdul-Maksoud RS, Elsayed WSH, Desoky EAM. Diagnostic and prognostic value of serum miR-15a and miR-16-1 expression among egyptian patients with prostate cancer. IUBMB Life 2018. [PMID: 29522280 DOI: 10.1002/iub.1733] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Prostate cancer (PCa) is considered the most common malignancy in men. The aim of this study is to assess the role of serum miR-15a and miR-16-1 expression in PCa development, diagnosis and prognosis aiming to find a specific noninvasive biomarker. This study comprised 70 patients with PCa, 70 patients complaining of benign prostatic hyperplasia (BPH), 30 patients with chronic prostatitis and 70 controls. Circulating miR-15a and miR-16-1 expression was detected by real-time polymerase chain reaction. Prostate specific antigen levels were measured by enzyme-linked immunosorbent assay. The expression levels of serum miR-15a were decreased in PCa patients compared with controls, chronic prostatitis and BPH patients (0.43 ± 0.12, 1.7 ± 0.76, 1.56 ± 0.34 and 1.53 ± 0.65, respectively). The expression levels of serum miR-16-1 were decreased in PCa patients compared with controls, chronic prostatitis and BPH patients (0.55 ± 0.23, 2.15 ± 0.87, 2.08 ± 0.54 and 1.96 ±0.61, respectively). Downregulation of miR-15a and miR-16-1 correlated with higher Gleason score (P = 0.002 and P = 0.006, respectively), higher tumor stage (P = 0.001 and P = 0.01, respectively), PCa metastasis (P = 0.002 and P = 0.025, respectively) and lymph node involvement (P = 0.02 and P = 0.007, respectively). Moreover, Receiver operating characteristic curve analysis revealed that combined miR-15a/miR-16-1 and PSA increased the sensitivity and specificity for the diagnosis of PCa (97.1% and 94.3%, respectively) more than prostate specific antigen alone (82.9% sensitivity and 75.7% specificity). Combined serum miR-15a/miR-16-1 expression and PSA level can be used as promising specific noninvasive biomarkers in the diagnosis and prognosis of PCa better than prostate specific antigen alone. © 2018 IUBMB Life, 70(5):437-444, 2018.
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Affiliation(s)
- Haidy E Zidan
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Rehab S Abdul-Maksoud
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Walid S H Elsayed
- Pathology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Esam A M Desoky
- Urology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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3
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Hao Z, Fan W, Hao J, Wu X, Zeng GQ, Zhang LJ, Nie SF, Wang XD. Efficient delivery of micro RNA to bone-metastatic prostate tumors by using aptamer-conjugated atelocollagen in vitro and in vivo. Drug Deliv 2014; 23:874-81. [PMID: 24892627 DOI: 10.3109/10717544.2014.920059] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Bone is the primary site of skeletal metastasis in prostate cancer (PCa). Atelocollagen (ATE)-mediated siRNA delivery system can be used to silence endogenous genes involved in PCa metastatic tumor cell growth. However, we hope that the delivery system can target PCa cells to reduce damage to the bone tissue and improve the therapeutic effect. RNA aptamer (APT) A10-3.2 has been used as a ligand to target PCa cells that express prostate-specific membrane antigen (PSMA). APT was investigated as a PSMA-targeting ligand in the design of an ATE-based microRNA (miRNA; miR-15a and miR-16-1) vector to PCa bone metastasis. To observe the targeted delivery and transfection efficiency of ATE-APT in PSMA-overexpressing cells, luciferase activity and biodistribution of nanoparticles in Balb/c mice was analyzed. The anticancer effect of nanoparticles in vivo was investigated using the survival times of human PCa bone metastasis mice model. Luciferase assays of pGL-3 expression against PC3 (PSMA(-)) and LNCaP (PSMA(+)) cells showed that the transfection efficiency of the synthesized DNA/ATE-APT complex was higher than that of the DNA/ATE complex. The anticancer efficacy of miRNA/ATE-APT was superior to those of other treatments in vivo. This PSMA-targeted system may prove useful in widening the therapeutic window and allow for selective killing of PCa cells in bone metastatic foci.
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Affiliation(s)
- Zhao Hao
- a Department of Orthopedics , The 425th Hospital of PLA , Sanya , China
| | - Wei Fan
- b Department of Pharmacy , The 425th Hospital of PLA , Sanya , China
| | - Jian Hao
- c Department of Orthopedics , Nankai Hospital , Tianjin , China , and
| | - Xin Wu
- d Department of Pharmacy , Changhai Hospital, Second Military Medical University , Shanghai , China
| | - Guo Qing Zeng
- b Department of Pharmacy , The 425th Hospital of PLA , Sanya , China
| | - Li Juan Zhang
- d Department of Pharmacy , Changhai Hospital, Second Military Medical University , Shanghai , China
| | - Sui Feng Nie
- a Department of Orthopedics , The 425th Hospital of PLA , Sanya , China
| | - Xu Dong Wang
- b Department of Pharmacy , The 425th Hospital of PLA , Sanya , China
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4
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Deletion of the olfactomedin 4 gene is associated with progression of human prostate cancer. THE AMERICAN JOURNAL OF PATHOLOGY 2014; 183:1329-38. [PMID: 24070418 DOI: 10.1016/j.ajpath.2013.06.028] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 06/10/2013] [Accepted: 06/24/2013] [Indexed: 02/07/2023]
Abstract
The olfactomedin 4 (OLFM4) gene is located on chromosome 13q14.3, which frequently is deleted in human prostate cancer. However, direct genetic evidence of OLFM4 gene alteration in human prostate cancer has not yet been obtained. In this study, we investigated the genetics, protein expression, and functions of the OLFM4 gene in human prostate cancer. We found overall 25% deletions within the OLFM4 gene in cancerous epithelial cells compared with adjacent normal epithelial cells that were microdissected from 31 prostate cancer specimens using laser-capture microdissection and genomic DNA sequencing. We found 28% to 45% hemizygous and 15% to 57% homozygous deletions of the OLFM4 gene via fluorescence in situ hybridization analysis from 44 different prostate cancer patient samples. Moreover, homozygous deletion of the OLFM4 gene significantly correlated with advanced prostate cancer. By using immunohistochemical analysis of 162 prostate cancer tissue array samples representing a range of Gleason scores, we found that OLFM4 protein expression correlated inversely with advanced prostate cancer, consistent with the genetic results. We also showed that a truncated mutant of OLFM4 that lacks the olfactomedin domain eliminated suppression of PC-3 prostate cancer cell growth. Together, our findings indicate that OLFM4 is a novel candidate tumor-suppressor gene for chromosome 13q and may shed new light on strategies that could be used for the diagnosis, prognosis, and treatment of prostate cancer patients.
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5
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Birerdinc A, Nohelty E, Marakhonov A, Manyam G, Panov I, Coon S, Nikitin E, Skoblov M, Chandhoke V, Baranova A. Pro-apoptotic and antiproliferative activity of human KCNRG, a putative tumor suppressor in 13q14 region. Tumour Biol 2009; 31:33-45. [PMID: 20237900 PMCID: PMC2803748 DOI: 10.1007/s13277-009-0005-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Accepted: 11/04/2009] [Indexed: 12/04/2022] Open
Abstract
Deletion of 13q14.3 and a candidate gene KCNRG (potassium channel regulating gene) is the most frequent chromosomal abnormality in B-cell chronic lymphocytic leukemia and is a common finding in multiple myeloma (MM). KCNRG protein may interfere with the normal assembly of the K+ channel proteins causing the suppression of Kv currents. We aimed to examine possible role of KCNRG haploinsufficiency in chronic lymphocytic leukemia (CLL) and MM cells. We performed detailed genomic analysis of the KCNRG locus; studied effects of the stable overexpression of KCNRG isoforms in RPMI-8226, HL-60, and LnCaP cells; and evaluated relative expression of its transcripts in various human lymphomas. Three MM cell lines and 35 CLL PBL samples were screened for KCNRG mutations. KCNRG exerts growth suppressive and pro-apoptotic effects in HL-60, LnCaP, and RPMI-8226 cells. Direct sequencing of KCNRG exons revealed point mutation delT in RPMI-8226 cell line. Levels of major isoform of KCNRG mRNA are lower in DLBL lymphomas compared to normal PBL samples, while levels of its minor mRNA are decreased across the broad range of the lymphoma types. The haploinsufficiency of KCNRG might be relevant to the progression of CLL and MM at least in a subset of patients.
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Affiliation(s)
- Aybike Birerdinc
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
| | - Elizabeth Nohelty
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
| | - Andrey Marakhonov
- Research Center for Medical Genetics, RAMS, Moskvorechie Str., 1, Moscow, Russian Federation
| | - Ganiraju Manyam
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
| | - Ivan Panov
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
| | - Stephanie Coon
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
| | - Eugene Nikitin
- Hematology Research Center of Russia, Moscow, Russian Federation
| | - Mikhail Skoblov
- Research Center for Medical Genetics, RAMS, Moskvorechie Str., 1, Moscow, Russian Federation
| | - Vikas Chandhoke
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
| | - Ancha Baranova
- Molecular Biology and Microbiology Department, College of Science, George Mason University, David King Hall, MSN 3E1, Fairfax, VA 22030 USA
- Research Center for Medical Genetics, RAMS, Moskvorechie Str., 1, Moscow, Russian Federation
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6
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Systemic delivery of synthetic microRNA-16 inhibits the growth of metastatic prostate tumors via downregulation of multiple cell-cycle genes. Mol Ther 2009; 18:181-7. [PMID: 19738602 DOI: 10.1038/mt.2009.207] [Citation(s) in RCA: 320] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Recent reports have linked the expression of specific microRNAs (miRNAs) with tumorigenesis and metastasis. Here, we show that microRNA (miR)-16, which is expressed at lower levels in prostate cancer cells, affects the proliferation of human prostate cancer cell lines both in vitro and in vivo. Transient transfection with synthetic miR-16 significantly reduced cell proliferation of 22Rv1, Du145, PPC-1, and PC-3M-luc cells. A prostate cancer xenograft model revealed that atelocollagen could efficiently deliver synthetic miR-16 to tumor cells on bone tissues in mice when injected into tail veins. In the therapeutic bone metastasis model, injection of miR-16 with atelocollagen via tail vein significantly inhibited the growth of prostate tumors in bone. Cell model studies indicate that miR-16 likely suppresses prostate tumor growth by regulating the expression of genes such as CDK1 and CDK2 associated with cell-cycle control and cellular proliferation. There is a trend toward lower miR-16 expression in human prostate tumors versus normal prostate tissues. Thus, this study indicates the therapeutic potential of miRNA in an animal model of cancer metastasis with systemic miRNA injection and suggest that systemic delivery of miR-16 could be used to treat patients with advanced prostate cancer.
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7
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Hanlon K, Harries LW, Ellard S, Rudin CE. Evaluation of 13q14 status in multiple myeloma by digital single nucleotide polymorphism technology. J Mol Diagn 2009; 11:450-7. [PMID: 19644022 DOI: 10.2353/jmoldx.2009.090027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Chromosome 13q deletions are common in multiple myeloma and other cancers, demonstrating the importance of this region in tumorigenesis. We used a novel single nucleotide polymorphism (SNP)-based technique, digital SNP (dSNP), to identify loss of heterozygosity (LOH) at chromosome 13q in paraffin-embedded bone marrow biopsies from 22 patients with multiple myeloma. We analyzed heterozygous SNPs at 13q for the presence of allelic imbalances and examined the results by sequential probability ratio analysis. Where possible, dSNP results were confirmed by fluorescence in situ hybridization. Using dSNP, we identified 13q LOH in 16/18 (89%) (95% Confidence Interval; 65%, 99%) patients without the need for neoplastic cell enrichment. In 8/16 (50%) cases, either partial or interstitial patterns of LOH were observed. Both fluorescence in situ hybridization and dSNP data proved concordant in just 3/9 cases. Five of the six discrepancies showed LOH by dSNP occurring beyond the boundaries of the fluorescence in situ hybridization probes. Our findings show that dSNP represents a useful technique for the analysis of LOH in archival tissue with minimal infiltration of neoplastic cells. The high-resolution screening afforded by the dSNP technology allowed for the identification of complex chromosomal rearrangements, resulting in either partial or interstitial LOH. Digital SNP represents an attractive approach for the investigation of tumors not suitable for genomic-array analysis.
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Affiliation(s)
- Katy Hanlon
- Institute of Biomedical and Clinical Sciences, Peninsula Medical School, Barrack Road, Exeter, EX2 5DW
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8
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Hanlon K, Ellard S, Rudin CE, Thorne S, Davies T, Harries LW. Evaluation of 13q14 status in patients with chronic lymphocytic leukemia using single nucleotide polymorphism-based techniques. J Mol Diagn 2009; 11:298-305. [PMID: 19460942 DOI: 10.2353/jmoldx.2009.080167] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Deletions of chromosome 13q14 are common in chronic lymphocytic leukemia and other cancers, demonstrating the importance of this region in tumorigenesis. We report the use of two single-nucleotide polymorphism (SNP)-based techniques to determine 13q loss of heterozygosity (LOH) status in 15 patients with CLL: (i) digital SNP (dSNP), where analysis of heterozygous SNPs detects allelic imbalances, and (ii) DNA sequencing, where LOH is identified by comparison of allelic peak heights in normal and neoplastic cells. The SNP-based techniques were compared with established molecular techniques, fluorescence in situ hybridization and multiplex ligation-dependent probe amplification, to determine their utility and relative sensitivity. dSNP proved to be the most sensitive technique, identifying 13q14 LOH in 11 of 13 (85%) patients (95% CI: 55%, 98%) without the need for neoplastic cell enrichment. Three cases showed evidence of LOH by dSNP that was not apparent by other techniques. In 8 of 13 (62%) cases, partial or interstitial patterns of LOH were observed by dSNP. Our findings demonstrate that dSNP represents a useful, sensitive technique for the analysis of chromosomal aberrations that result in LOH. It may have applications for the analysis of other malignancies that are difficult to assess by conventional molecular techniques.
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Affiliation(s)
- Katy Hanlon
- Department of Molecular Genetics, Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
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9
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Nakano M, Takahashi H, Shiraishi T, Lu T, Furusato M, Wakui S, Hano H. Prediction of clinically insignificant prostate cancer by detection of allelic imbalance at 6q, 8p and 13q. Pathol Int 2008; 58:415-20. [DOI: 10.1111/j.1440-1827.2008.02246.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Lu T, Hano H. Deletion at chromosome arms 6q16-22 and 10q22.3-23.1 associated with initiation of prostate cancer. Prostate Cancer Prostatic Dis 2008; 11:357-61. [PMID: 18227855 DOI: 10.1038/pcan.2008.4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Loss of heterozygosity (LOH) at 6q16-22 and 10q22.3-23.1 is common chromosomal alteration in advanced prostate cancer and suggests that one or more tumor suppressor genes may lie within these chromosome arms. However, the genetic changes in early stage prostate cancer and premalignant lesions remain to be investigated. We used 11 informative microsatellite markers at 6q16-22 and 10q22.3-23.1 in Japanese patients to compare the frequency of LOH in 53 lesions of high-grade prostatic intraepithelial neoplasia (HGPIN), 38 cases (38 lesions) of incidental prostate cancer (IPC) and 107 cases (168 lesions) of clinical prostate cancer (CPC). The frequency of LOH at 6q16-22 with at least one marker was 38 and 49% in IPC and CPC cases, respectively. Similarly, allelic loss at 10q22.3-23.1 was present in 35 and 39% of IPC and CPC, respectively. High-frequency LOH was detected in both the clinically insignificant and significant prostate cancers at 6q16-22 and 10q22.3-23.1 (P>0.05). However, no allelic loss was detected in any markers at the same regions in HGPIN (0%), which is usually considered a premalignant lesion to prostate cancer. Deletions of both the chromosome regions, 6q16-22 and 10q22.3-23.1, are more likely important events in the initiation and/or promotion of prostate cancer.
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Affiliation(s)
- T Lu
- Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan.
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11
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Allelic imbalance at 13q14.2 approximately q14.3 in localized prostate cancer is associated with early biochemical relapse. ACTA ACUST UNITED AC 2008; 179:118-26. [PMID: 18036398 DOI: 10.1016/j.cancergencyto.2007.08.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2007] [Accepted: 08/30/2007] [Indexed: 11/17/2022]
Abstract
Allelic imbalance (AI), particularly at chromosomes 8p, 10q, and 13q, is the most frequently observed genetic change in sporadic prostate cancer. AI at these sites may inactivate tumor suppressor genes that regulate normal cell growth. To establish the relationship between AI and progression, we analyzed loci on 8p, 10q, and 13q14 in archival prostate tumors matched for Gleason grade, pre-operative prostate-specific antigen levels, and pathologic stage, and they were paired on the basis of relapse status after 3 years. AI was identified in 66% of patients without relapse and in 73% with relapse. There was no statistically significant difference for AI at 8p21.3 and 10q23.2 between the two groups of patients, but significant differences between relapsers and nonrelapsers in the frequency of AI at D13S165 at 13q14.2 (P=0.006) and D13S273 at 13q14.3 (P=0.03). There was also a significantly higher incidence of AI at both loci in the relapsers compared to the nonrelapsers (P=0.03). In three relapsers, AI occurred at all three loci between 13q14.2 and 13q14.3, with no nonrelapsers demonstrating AI at all three loci. These findings show that AI at 13q14.2 approximately q14.3 is an important event in the progression of localized prostate cancer, and suggest a possible role for microRNAs.
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Saigusa K, Imoto I, Tanikawa C, Aoyagi M, Ohno K, Nakamura Y, Inazawa J. RGC32, a novel p53-inducible gene, is located on centrosomes during mitosis and results in G2/M arrest. Oncogene 2007; 26:1110-21. [PMID: 17146433 DOI: 10.1038/sj.onc.1210148] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2006] [Revised: 09/12/2006] [Accepted: 10/17/2006] [Indexed: 11/09/2022]
Abstract
To identify target genes for the hemizygous deletions of chromosome 13 that are recurrently observed in malignant gliomas, we performed genome-wide DNA copy-number analysis using array-based comparative genomic hybridization and gene expression analysis using an oligonucleotide-array. The response gene to complement 32 (RGC32) at 13q14.11 was identified as a deletion target, and its expression was frequently silenced in glioma cell lines compared with normal brain. Levels of RGC32 mRNA tended to decrease toward higher grades of primary astrocytomas, especially in tumors with mutations of p53. Expression of RGC32 mRNA was dramatically increased by exogenous p53 in a p53-mutant glioma cell line, and also by endogenous p53 in response to DNA damage in p53+/+ colon-cancer cells, but not in isogenic p53-/- cells. Chromatin immunoprecipitation and reporter assays demonstrated binding of endogenous p53 protein to the promoter region of the RGC32 gene, implying p53-dependent transcriptional activity. Transiently and stably overexpressed RGC32 suppressed the growth of glioma cells, probably owing to induction of G2/M arrest. Immunocytochemical analysis revealed a concentration of RGC32 protein at the centrosome during mitosis. RGC32 formed a protein complex with polo-like kinase 1 and was phosphorylated in vitro. These observations implied a novel mechanism by which p53 might negatively regulate cell-cycle progression by way of this newly identified transcriptional target. Our results provide the first evidence that RGC32 might be a possible tumor-suppressor for glioma, that it is directly induced by p53, and that it mediates the arrest of mitotic progression.
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Affiliation(s)
- K Saigusa
- Department of Molecular Cytogenetics, Medical Research Institute and Graduate School of Biomedical Science, Tokyo Medical and Dental University, Tokyo, Japan
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