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Bhagirath D, Yang TL, Tabatabai ZL, Shahryari V, Majid S, Dahiya R, Tanaka Y, Saini S. Role of a novel race-related tumor suppressor microRNA located in frequently deleted chromosomal locus 8p21 in prostate cancer progression. Carcinogenesis 2019; 40:633-642. [PMID: 30874288 PMCID: PMC7331454 DOI: 10.1093/carcin/bgz058] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 02/07/2019] [Accepted: 03/12/2019] [Indexed: 12/14/2022] Open
Abstract
The prostate cancer (PCa) genome is characterized by deletions of chromosome 8p21-22 region that increase significantly with tumor grade and are associated with poor prognosis. We proposed and validated a novel, paradigm-shifting hypothesis that this region is associated with a set of microRNA genes-miR-3622, miR-3622b, miR-383-that are lost in PCa and play important mechanistic roles in PCa progression and metastasis. Extending our hypothesis, in this study, we evaluated the role of a microRNA gene located in chromosome 8p-miR-4288-by employing clinical samples and cell lines. Our data suggests that (i) miR-4288 is widely downregulated in primary prostate tumors and cell lines; (ii) miR-4288 expression is lost in metastatic castration-resistant PCa; (ii) miR-4288 downregulation is race-related PCa alteration that is prevalent in Caucasian patients and not in African Americans; (iii) in Caucasians, miR-4288 was found to be associated with increasing tumor grade and high serum prostate-specific antigen, suggesting that miR-4288 downregulation/loss may be associated with tumor progression specifically in Caucasians; (iv) miR-4288 possess significant potential as a molecular biomarker to predict aggressiveness/metastasis; and (v) miR-4288 is anti-proliferative, is anti-invasive and inhibits epithelial-to-mesenchymal transition; and (vi) miR-4288 directly represses expression of metastasis/invasion-associated genes MMP16 and ROCK1. Thus, the present study demonstrates a tumor suppressor role for a novel miRNA located with a frequently lost region in PCa, strengthening our hypothesis that this locus is causally related to PCa disease progression via loss of microRNA genes. Our study suggests that miR-4288 may be a novel biomarker and therapeutic target, particularly in Caucasians.
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Affiliation(s)
- Divya Bhagirath
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Thao Ly Yang
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Z Laura Tabatabai
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Varahram Shahryari
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Shahana Majid
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Rajvir Dahiya
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Yuichiro Tanaka
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
| | - Sharanjot Saini
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California, San Francisco, CA, USA
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Singh SK, Lillard JW, Singh R. Molecular basis for prostate cancer racial disparities. Front Biosci (Landmark Ed) 2017; 22:428-450. [PMID: 27814623 DOI: 10.2741/4493] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Prostate cancer (PCa) remains the most common cancer in American men. African-American (AA) men continue to have higher PCa prevalence and mortality rates compared to men in other populations. In addition to socioeconomic factors and lifestyle differences, molecular alterations contribute to this discrepancy. We summarize molecular genetics research results interrelated with the biology of PCa racial disparity. Androgen and androgen receptor (AR) pathways have long been associated with prostate growth. Racial differences have also been found among variants of genes of the enzymes involved in androgen biosynthesis and metabolism. Growth factors and their receptors are a potential cause of the disparity in PCa. Recent molecular and biotechnological approaches in the field of proteomics and genomics will greatly aid the advancement of translational research on racial disparity in PCa, which may help, in finding new prognostic markers and novel therapeutic approaches for the treatment of PCa in AA.
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Affiliation(s)
- Santosh K Singh
- Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, Georgia 30310
| | - James W Lillard
- Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, Georgia 30310
| | - Rajesh Singh
- Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, Georgia 30310,
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Ifere GO, Abebe F, Ananaba GA. Emergent trends in the reported incidence of prostate cancer in Nigeria. Clin Epidemiol 2012; 4:19-32. [PMID: 22291480 PMCID: PMC3266866 DOI: 10.2147/clep.s23536] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND To date there has not been any nationwide age-standardized incidence data reported for prostate cancer in Nigeria. We examined and integrated diverse trends in the age-specific incidence of prostate cancer into a comprehensive trend for Nigeria, and examined how best the existing data could generate a countrywide age-standardized incidence rate for the disease. METHODS Data were obtained from studies undertaken between 1970 and 2007 in referral hospital-based cancer registries. Records from at least one tertiary hospital in each of the six geopolitical zones of Nigeria were examined retrospectively. Data were also reported for the rural population in cross-sectional prospective studies. Age-standardized incidence rates and the annual incidence of disease were calculated. RESULTS Higher incidence rates for prostate cancer during this period were recorded for patients aged 60-69 years and 70-79 years, with a lower incidence rate for patients aged younger than 50 years. An exponential annual incidence rate of disease was observed in the 50-79 year age group and peaked at 70-79 years before dropping again at age 80 years. The results showed metastasis in more than half of these hospital-based prostate tumors. CONCLUSION Our results suggest that prostate cancer occurs at a relatively young age in Nigerians and that hospital-based registry reports may not appropriately reflect the incidence of the disease in Nigeria. A countrywide screening program is urgently needed. Finally, the difference in reported stages of disease found in Nigerians and African-Americans versus Caucasians suggests biological differences in the prognosis. Nigeria may thus typify one of the ancestral populations that harbor inherited genes predisposing African-Americans to high-risk prostate cancer.
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Affiliation(s)
- Godwin O Ifere
- Department of Biological Sciences, Clark Atlanta University, Atlanta, GA, USA
| | - Fisseha Abebe
- Department of Mathematical Sciences, Clark Atlanta University, Atlanta, GA, USA
| | - Godwin A Ananaba
- Department of Biological Sciences, Clark Atlanta University, Atlanta, GA, USA
- Center for Cancer Research and Therapeutic Development, Clark Atlanta University, Atlanta, GA, USA
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Morikawa A, Varma V, Gillespie TW, Lyles RH, Goodman M, Bostick RM, Mandel JS, Zhou W. Counting alleles in single lesions of prostate tumors from ethnically diverse patients. Prostate 2008; 68:231-40. [PMID: 18092351 DOI: 10.1002/pros.20693] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND The presence of racial disparities in incidence and mortality rates are well-documented for prostate cancer. Nevertheless, it is unclear whether such disparities are due to genetic alterations that are involved in prostate cancer initiation. Here, we evaluated chromosome 8p allelic loss in a racially diverse cohort. METHODS Laser-capture microdissection was used to isolate tumors cells from individual lesions in 153 prostate cancer patients, and 8p allelic status was determined by "counting alleles." Statistical analyses examined the association between pathologic predictors and biochemical recurrence. RESULTS AND CONCLUSIONS Thirty percent of prostate lesions were missing an 8p allele at tumor initiation, while 51% of lesions lost an 8p allele during tumor progression. Biochemical recurrence after radical prostatectomy could be reliably predicted by surgical margin status only in lesions with extensive 8p allelic loss. There was, however, no racial disparity in 8p allelic loss at tumor initiation or during tumor progression, suggesting that the molecular event involved was similar between Caucasians and Africa Americans (CA and AA). Nonetheless, racial differences were present in values of prognostic factors for recurrence. Gleason score was the most important predictor of recurrence (HR=3.1, 95% CI=1.1, 9.2) in AA, while among CA, pathologic stage (HR=3.3, 95% CI=1.5, 7.6) and surgical margin (HR=4.7, 95% CI=1.8, 12.6) were the most important. Therefore, racial disparity in prostate cancer may be due to other factors that are involved in prostate cancer development.
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Affiliation(s)
- Aki Morikawa
- Emory University School of Medicine, Winship Cancer Institute, Atlanta, Georgia 30322, USA
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Asamoto M, Hokaiwado N, Cho YM, Shirai T. Effects of genetic background on prostate and taste bud carcinogenesis due to SV40 T antigen expression under probasin gene promoter control. Carcinogenesis 2002; 23:463-7. [PMID: 11895861 DOI: 10.1093/carcin/23.3.463] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The incidence of prostate carcinomas in African-American men is greater than in white men, indicating genetic factors are involved in risk of this neoplasia. Recently, we have developed a transgenic rat model of prostate cancer, featuring development of malignancies within 15 weeks of age at very high incidence. Male transgenic rats with a Sprague-Dawley genetic background were mated with wild-type females of F344, Wistar and ACI strains. F1 male transgenic hybrids with female Wistar and ACI rats had significantly lowered incidences of prostate carcinomas. However, the serum level of testosterone, and expression of the transgene, probasin, and the androgen receptor did not correlate with the strain variation in tumor development. Furthermore, immunohistochemical analysis of the SV40 Tag and the androgen receptor also did not reveal any differences between the strains. The transgenic rats additionally developed taste bud neuroblastomas at 100% incidence and this was suppressed in F1 male transgenic offspring with the ACI, but not the other strains. These results clearly show that genetic background influences prostate carcinogenesis and taste bud tumorigenesis in rats and that the present transgenic rats could provide a good model to identify specific factors.
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Affiliation(s)
- Makoto Asamoto
- First Department of Pathology, Nagoya City University Medical School, Kawasumi 1, Mizuho-cho, Mizuho-ku, Nagoya City 467-8601, Japan.
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Asamoto M, Hokaiwado N, Cho YM, Shirai T. A Transgenic Rat Model of Prostate Carcinogenesis. J Toxicol Pathol 2002. [DOI: 10.1293/tox.15.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Makoto Asamoto
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences
| | - Naomi Hokaiwado
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences
| | - Young-Man Cho
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences
| | - Tomoyuki Shirai
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences
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Stanzione R, Picascia A, Chieffi P, Imbimbo C, Palmieri A, Mirone V, Staibano S, Franco R, De Rosa G, Schlessinger J, Tramontano D. Variations of proline-rich kinase Pyk2 expression correlate with prostate cancer progression. J Transl Med 2001; 81:51-9. [PMID: 11204274 DOI: 10.1038/labinvest.3780211] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Proline-rich kinase 2 (Pyk2), also known as CAKbeta (cell adhesion kinase beta), is a cytoplasmic tyrosine kinase that is structurally related to focal adhesion kinase. Pyk2 is expressed in different cell types including brain cells, fibroblasts, platelets, and other hemopoietic cells. Pyk2 is rapidly tyrosine phosphorylated in response to diverse extracellular signals acting via different post receptor pathways. We have investigated whether this protein kinase is functionally expressed in normal and neoplastic prostate tissues. In this study, we demonstrate that Pyk2 is expressed only in normal epithelial prostate tissue and in benign prostatic hyperplasia, whereas its expression progressively declines with an increasing grade of malignancy of prostate cancer.
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Affiliation(s)
- R Stanzione
- Dipartimento di Biologia e Patologia Molecolare e Cellulare Luigi Califano, and Centro di Endocrinologia ed Oncologia Sperimentale del CNR Gaetano Salvatore, Naples, Italy
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