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Huber D, Hatzipanagiotou M, Schüler-Toprak S, Ortmann O, Treeck O. Effects of Endocrine Interventions Targeting ERα or PR on Breast Cancer Risk in the General Population and Carriers of BRCA1/2 Pathogenic Variants. Int J Mol Sci 2024; 25:5894. [PMID: 38892081 PMCID: PMC11172552 DOI: 10.3390/ijms25115894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/17/2024] [Accepted: 05/25/2024] [Indexed: 06/21/2024] Open
Abstract
There is evidence suggesting that endocrine interventions such as hormone replacement therapy and hormonal contraception can increase breast cancer (BC) risk. Sexual steroid hormones like estrogens have long been known for their adverse effects on BC development and progression via binding to estrogen receptor (ER) α. Thus, in recent years, endocrine interventions that include estrogens have been discussed more and more critically, and their impact on different BC subgroups has increasingly gained interest. Carriers of pathogenic variants in BRCA1/2 genes are known to have a high risk of developing BC and ovarian cancer. However, there remain open questions to what extent endocrine interventions targeting ERα or the progesterone receptor further increase cancer risk in this subgroup. This review article aims to provide an overview and update on the effects of endocrine interventions on breast cancer risk in the general population in comparison to BRCA1/2 mutation carriers. Finally, future directions of research are addressed, to further improve the understanding of the effects of endocrine interventions on high-risk pathogenic variant carriers.
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Affiliation(s)
- Deborah Huber
- Department of Gynecology and Obstetrics, University Medical Center Regensburg, 93053 Regensburg, Germany; (D.H.); (M.H.); (S.S.-T.); (O.O.)
- Department of Obstetrics and Gynecology, Technical University of Munich, 80333 Munich, Germany
| | - Maria Hatzipanagiotou
- Department of Gynecology and Obstetrics, University Medical Center Regensburg, 93053 Regensburg, Germany; (D.H.); (M.H.); (S.S.-T.); (O.O.)
| | - Susanne Schüler-Toprak
- Department of Gynecology and Obstetrics, University Medical Center Regensburg, 93053 Regensburg, Germany; (D.H.); (M.H.); (S.S.-T.); (O.O.)
| | - Olaf Ortmann
- Department of Gynecology and Obstetrics, University Medical Center Regensburg, 93053 Regensburg, Germany; (D.H.); (M.H.); (S.S.-T.); (O.O.)
| | - Oliver Treeck
- Department of Gynecology and Obstetrics, University Medical Center Regensburg, 93053 Regensburg, Germany; (D.H.); (M.H.); (S.S.-T.); (O.O.)
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Suba Z. DNA Damage Responses in Tumors Are Not Proliferative Stimuli, but Rather They Are DNA Repair Actions Requiring Supportive Medical Care. Cancers (Basel) 2024; 16:1573. [PMID: 38672654 PMCID: PMC11049279 DOI: 10.3390/cancers16081573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/05/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND In tumors, somatic mutagenesis presumably drives the DNA damage response (DDR) via altered regulatory pathways, increasing genomic instability and proliferative activity. These considerations led to the standard therapeutic strategy against cancer: the disruption of mutation-activated DNA repair pathways of tumors. PURPOSE Justifying that cancer cells are not enemies to be killed, but rather that they are ill human cells which have the remnants of physiologic regulatory pathways. RESULTS 1. Genomic instability and cancer development may be originated from a flaw in estrogen signaling rather than excessive estrogen signaling; 2. Healthy cells with genomic instability exhibit somatic mutations, helping DNA restitution; 3. Somatic mutations in tumor cells aim for the restoration of DNA damage, rather than further genomic derangement; 4. In tumors, estrogen signaling drives the pathways of DNA stabilization, leading to apoptotic death; 5. In peritumoral cellular infiltration, the genomic damage of the tumor induces inflammatory cytokine secretion and increased estrogen synthesis. In the inflammatory cells, an increased growth factor receptor (GFR) signaling confers the unliganded activation of estrogen receptors (ERs); 6. In breast cancer cells responsive to genotoxic therapy, constitutive mutations help the upregulation of estrogen signaling and consequential apoptosis. In breast tumors non-responsive to genotoxic therapy, the possibilities for ER activation via either liganded or unliganded pathways are exhausted, leading to farther genomic instability and unrestrained proliferation. CONCLUSIONS Understanding the real character and behavior of human tumors at the molecular level suggests that we should learn the genome repairing methods of tumors and follow them by supportive therapy, rather than provoking additional genomic damages.
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Affiliation(s)
- Zsuzsanna Suba
- Department of Molecular Pathology, National Institute of Oncology, Ráth György Str. 7-9, H-1122 Budapest, Hungary
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The Interplay between the Cellular Response to DNA Double-Strand Breaks and Estrogen. Cells 2022; 11:cells11193097. [PMID: 36231059 PMCID: PMC9563627 DOI: 10.3390/cells11193097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 09/28/2022] [Accepted: 09/29/2022] [Indexed: 11/17/2022] Open
Abstract
Cancer development is often connected to impaired DNA repair and DNA damage signaling pathways. The presence of DNA damage in cells activates DNA damage response, which is a complex cellular signaling network that includes DNA repair, activation of the cell cycle checkpoints, cellular senescence, and apoptosis. DNA double-strand breaks (DSBs) are toxic lesions that are mainly repaired by the non-homologous end joining and homologous recombination repair (HRR) pathways. Estrogen-dependent cancers, like breast and ovarian cancers, are frequently associated with mutations in genes that play a role in HRR. The female sex hormone estrogen binds and activates the estrogen receptors (ERs), ERα, ERβ and G-protein-coupled ER 1 (GPER1). ERα drives proliferation, while ERβ inhibits cell growth. Estrogen regulates the transcription, stability and activity of numerus DDR factors and DDR factors in turn modulate ERα expression, stability and transcriptional activity. Additionally, estrogen stimulates DSB formation in cells as part of its metabolism and proliferative effect. In this review, we will present an overview on the crosstalk between estrogen and the cellular response to DSBs. We will discuss how estrogen regulates DSB signaling and repair, and how DDR factors modulate the expression, stability and activity of estrogen. We will also discuss how the regulation of HRR genes by estrogen promotes the development of estrogen-dependent cancers.
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Perrone E, Tudisco R, Pafundi PC, Guido D, Ciucci A, Martinelli E, Zannoni GF, Piermattei A, Spadola S, Ferrante G, Marchetti C, Scambia G, Fagotti A, Gallo D. What’s beyond BRCA Mutational Status in High Grade Serous Ovarian Cancer? The Impact of Hormone Receptor Expression in a Large BRCA-Profiled Ovarian Cancer Patient Series: A Retrospective Cohort Study. Cancers (Basel) 2022; 14:cancers14194588. [PMID: 36230510 PMCID: PMC9559459 DOI: 10.3390/cancers14194588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 09/17/2022] [Indexed: 12/03/2022] Open
Abstract
Simple Summary Ovarian hormones are involved in ovarian cancer pathogenesis. However, few reports have investigated the hormone receptor pattern according to BRCA mutational status. The aim of this single-center, observational, retrospective study was to explore the relationship between hormone receptor status and BRCA1/2 mutation in a cohort of 207 high-grade serous ovarian carcinoma (HGSOC) patients. Interesting differences emerged between BRCA-mutated and BRCA wild-type women, in terms of pattern of receptor expression and its association to the outcome. On the whole, our findings, though needing further validation, extend our understanding of the complex interplay between BRCA1/2 protein and hormone signaling, suggesting new pathways to be exploited in order to develop future personalized therapy. Abstract Several studies have explored the prognostic role of hormone receptor status in high-grade serous ovarian cancer (HGSOC) patients. However, few reports have investigated their expression according to BRCA mutational status. The aim of this single-center, observational, retrospective study was to explore the hormone receptor pattern and its potential prognostic role in a cohort of 207 HGSOC women stratified for BRCA mutational status. To this end, ERα, ERβ1, ERβ2, ERβ5, PR, and AR expression were assessed by immunohistochemistry in 135 BRCA-wild type (BRCA-wt) and 72 BRCA1/2 mutation carriers (BRCA-mut). No significant difference emerged in hormone receptor expression between the two sub-samples, except for a significantly lower ERα expression observed in pre-menopausal BRCA1/2-mut as compared to BRCA-wt patients (p = 0.02). None of the examined hormone receptors has revealed a significant prognostic role in the whole sample, apart from the ratio ERα/ERβ5 nuclear, for which higher values disclosed a positive role on the outcome in BRCA-wt subgroup (HR 0.77; CI 0.61–0.96; p = 0.019). Conversely, it negatively affected overall survival in the presence of BRCA1/2-mut (HR 1.41; CI 1.06–1.87; p = 0.020). Finally, higher PR levels were associated with platinum sensitivity in the whole sample (p = 0.019). Our data, though needing further validation, suggest a potential role of oestrogen-mediated pathways in BRCA1/2-associated HGSOC tumorigenesis, thus revealing a possible therapeutic potential for targeting this interaction.
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Affiliation(s)
- Emanuele Perrone
- Gynecologic Oncology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Riccardo Tudisco
- Gynecologic Oncology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Pia Clara Pafundi
- Epidemiology and Biostatistics Facility Core Research, Gemelli Science and Technology Park, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Davide Guido
- Bioinformatics Facility Core Research, Gemelli Science and Technology Park (GSTeP) Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Alessandra Ciucci
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
- Unit of Translational Medicine for Woman and Child Health, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Enrica Martinelli
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
- Unit of Translational Medicine for Woman and Child Health, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Gian Franco Zannoni
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
- Gynecopathology and Breast Pathology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Alessia Piermattei
- Gynecopathology and Breast Pathology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Saveria Spadola
- Gynecopathology and Breast Pathology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Giulia Ferrante
- Gynecologic Oncology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Claudia Marchetti
- Gynecologic Oncology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Giovanni Scambia
- Gynecologic Oncology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Anna Fagotti
- Gynecologic Oncology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Daniela Gallo
- Universita’ Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
- Unit of Translational Medicine for Woman and Child Health, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, Largo Francesco Vito 1, 00168 Rome, Italy
- Correspondence:
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The Breast Cancer Protooncogenes HER2, BRCA1 and BRCA2 and Their Regulation by the iNOS/NOS2 Axis. Antioxidants (Basel) 2022; 11:antiox11061195. [PMID: 35740092 PMCID: PMC9227079 DOI: 10.3390/antiox11061195] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 02/04/2023] Open
Abstract
The expression of inducible nitric oxide synthase (iNOS; NOS2) and derived NO in various cancers was reported to exert pro- and anti-tumorigenic effects depending on the levels of expression and the tumor types. In humans, the breast cancer level of iNOS was reported to be overexpressed, to exhibit pro-tumorigenic activities, and to be of prognostic significance. Likewise, the expression of the oncogenes HER2, BRCA1, and BRCA2 has been associated with malignancy. The interrelationship between the expression of these protooncogenes and oncogenes and the expression of iNOS is not clear. We have hypothesized that there exist cross-talk signaling pathways between the breast cancer protooncogenes, the iNOS axis, and iNOS-mediated NO mutations of these protooncogenes into oncogenes. We review the molecular regulation of the expression of the protooncogenes in breast cancer and their interrelationships with iNOS expression and activities. In addition, we discuss the roles of iNOS, HER2, BRCA1/2, and NO metabolism in the pathophysiology of cancer stem cells. Bioinformatic analyses have been performed and have found suggested molecular alterations responsible for breast cancer aggressiveness. These include the association of BRCA1/2 mutations and HER2 amplifications with the dysregulation of the NOS pathway. We propose that future studies should be undertaken to investigate the regulatory mechanisms underlying the expression of iNOS and various breast cancer oncogenes, with the aim of identifying new therapeutic targets for the treatment of breast cancers that are refractory to current treatments.
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Yoshida R. Hereditary breast and ovarian cancer (HBOC): review of its molecular characteristics, screening, treatment, and prognosis. Breast Cancer 2021; 28:1167-1180. [PMID: 32862296 PMCID: PMC8514387 DOI: 10.1007/s12282-020-01148-2] [Citation(s) in RCA: 98] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 08/17/2020] [Indexed: 12/18/2022]
Abstract
Breast cancer is a common cancer affecting a large number of patients. Notably, 5-10% of all breast cancer patients are genetically predisposed to cancers. Although the most common breast cancer susceptibility genes are BRCA1 and BRCA2, which are also associated with the risk of developing ovarian and pancreatic cancer, advances in next-generation sequencing (NGS) analysis technology enabled the discovery of several non-BRCA genes responsible for breast and ovarian cancers. Studies on hereditary breast and ovarian cancer (HBOC) involve not only determining the predisposition to developing cancer, but also considering the current treatment for breast cancer, prevention of next cancer, risk diagnosis, and adoption of protective measures for relatives. We present a comprehensive review of HBOC, which will be a useful resource in the clinical setting. Many hereditary tumors, including HBOC, are syndromes characterized by the development of different types of cancer in succession. Taking advantage of knowing predisposition of susceptibility to cancer, it is important to continue and update cancer management protocols, which includes the adoption of preventive measures, countermeasures, and treatments, to accurately assess and prevent the impact of cancer on the quality of life of the next generation of patients.
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Affiliation(s)
- Reiko Yoshida
- Showa University Advanced Cancer Translational Research Institute, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan.
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7
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Russi M, Marson D, Fermeglia A, Aulic S, Fermeglia M, Laurini E, Pricl S. The fellowship of the RING: BRCA1, its partner BARD1 and their liaison in DNA repair and cancer. Pharmacol Ther 2021; 232:108009. [PMID: 34619284 DOI: 10.1016/j.pharmthera.2021.108009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 08/22/2021] [Accepted: 09/20/2021] [Indexed: 12/12/2022]
Abstract
The breast cancer type 1 susceptibility protein (BRCA1) and its partner - the BRCA1-associated RING domain protein 1 (BARD1) - are key players in a plethora of fundamental biological functions including, among others, DNA repair, replication fork protection, cell cycle progression, telomere maintenance, chromatin remodeling, apoptosis and tumor suppression. However, mutations in their encoding genes transform them into dangerous threats, and substantially increase the risk of developing cancer and other malignancies during the lifetime of the affected individuals. Understanding how BRCA1 and BARD1 perform their biological activities therefore not only provides a powerful mean to prevent such fatal occurrences but can also pave the way to the development of new targeted therapeutics. Thus, through this review work we aim at presenting the major efforts focused on the functional characterization and structural insights of BRCA1 and BARD1, per se and in combination with all their principal mediators and regulators, and on the multifaceted roles these proteins play in the maintenance of human genome integrity.
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Affiliation(s)
- Maria Russi
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy
| | - Domenico Marson
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy
| | - Alice Fermeglia
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy
| | - Suzana Aulic
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy
| | - Maurizio Fermeglia
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy
| | - Erik Laurini
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy
| | - Sabrina Pricl
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTs), DEA, University of Trieste, Trieste, Italy; Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.
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P SS, Naresh P, A J, Wadhwani A, M SK, Jubie S. Dual Modulators of p53 and Cyclin D in ER Alpha Signaling by Albumin Nanovectors Bearing Zinc Chaperones for ER-positive Breast Cancer Therapy. Mini Rev Med Chem 2021; 21:792-802. [PMID: 33238842 DOI: 10.2174/1389557520999201124212347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 07/06/2020] [Accepted: 07/24/2020] [Indexed: 11/22/2022]
Abstract
CDATA[The inherited mutations and underexpression of BRCA1 in sporadic breast cancers resulting in the loss or functional inactivation of BRCA1 may contribute to a high risk of breast cancer. Recent researchers have identified small molecules (BRCA1 mimetics) that fit into a BRCA1 binding pocket within Estrogen Receptor alpha (ERα), mimic the ability of BRCA1 to inhibit ERα activity, and overcome antiestrogen resistance. Studies indicate that most of the BRCA1 breast cancer cases are associated with p53 mutations. It indicates that there is a potential connection between BRCA1 and p53. Most p53 mutations are missense point mutations that occur in the DNA-binding domain. Structural studies have demonstrated that mutant p53 core domain misfolding, especially p53-R175H, is reversible. Mutant p53 reactivation with a new class of zinc metallochaperones (ZMC) restores WT p53 structure and functions by restoring Zn2+ to Zn2+ deficient mutant p53. Considering the role of WT BRCA1 and reactivation of p53 in tumor cells, our hypothesis is to target both tumor suppressor proteins by a novel biomolecule (ZMC). Since both proteins are present in the same cell and are functionally inactive, this state may be a novel efficacious therapeutic regime for breast cancer therapy. In addition, we propose to use Albumin Nanovector (ANV) formulation for target drug release.
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Affiliation(s)
- Shyam Sundar P
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, India
| | - Podila Naresh
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, India
| | - Justin A
- Department of Pharmacology, JSS College of Pharmacy, India
| | - Ashish Wadhwani
- Department of Pharmaceutical Biotechnology, JSS College of Pharmacy, India
| | - Suresh Kumar M
- Department of Pharmacognosy & Phytopharmacy, JSS College of Pharmacy, JSS Academy of Higher Education & Research Ooty, Nilgiris, Tamilnadu, India
| | - Selvaraj Jubie
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, India
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Sahay D, Lloyd SE, Rivera JA, Jezioro J, McDonald JD, Pitiranggon M, Yan B, Szabolcs M, Terry MB, Miller RL. Prenatal polycyclic aromatic hydrocarbons, altered ERα pathway-related methylation and expression, and mammary epithelial cell proliferation in offspring and grandoffspring adult mice. ENVIRONMENTAL RESEARCH 2021; 196:110961. [PMID: 33675803 PMCID: PMC8119355 DOI: 10.1016/j.envres.2021.110961] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/24/2021] [Accepted: 02/28/2021] [Indexed: 05/23/2023]
Abstract
BACKGROUND Airborne polycyclic aromatic hydrocarbons (PAH) possess carcinogenic and endocrine disrupting properties linked to mammary tumorigenesis. These effects may be initiated during a prenatal period of susceptibility to PAH activation of the aryl hydrocarbon receptor (Ahr) and through downstream effects on estrogen receptor (Er) α. PURPOSE We hypothesized prenatal airborne PAH exposure induces sustained effects in female adult wild type BALB/cByj mice detected in the offspring (F1) and grandoffspring (F2) generation. We hypothesized these effects would include altered expression and epigenetic regulation of Erα and altered expression of aryl hydrocarbon receptor repressor (Ahrr, Ahrr/aryl hydrocarbon receptor nuclear translocator (Arnt), and breast cancer type 1 susceptibility (Brca1). Further, we hypothesized that PAH would induce precancerous outcomes such as epithelial cell proliferation and epithelial cell hyperplasia in mammary glands of adult female offspring and grandoffspring. RESULTS Prenatal ambient PAH exposure lowered Erα mRNA expression (F1 and F2: p<0.001 for each) and induced methylation in the Erα promoter in mammary tissue in offspring and grandoffspring mice on postnatal day (PND) 60. Prenatal PAH lowered Brca1 mRNA (F1: p=0.002, F2: p=0.02); Erα mRNA was correlated with Brca1 (F1: r=0.42, p=0.02; F2: r=0.53, p=0.005). Prenatal PAH lowered Ahrr (F1: p=0.03, F2: p=0.009) and raised Arnt mRNA expression (F1: p=0.01, F2: p=0.03). Alterations in Erα mRNA (F2: p<0.0001) and Ahrr (F2: p=0.02) in the grandoffspring mice also occured by PND 28, and similarly occurred in the dam on postpartum day (PPD) 28. Finally, prenatal PAH was associated with higher mammary epithelial cell proliferation in the offspring (p=0.02), but not grandoffspring mice, without differences in the frequency of mammary cell hyperplasia. These results did not differ after adjustment by each candidate gene expression level. CONCLUSIONS Prenatal PAH exposure induces DNA methylation and alters gene expression in the Erα-mediated pathway across generations, and suggests that functional outcomes such as mammary cell proliferation also may occur in offspring as a result.
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Affiliation(s)
- Debashish Sahay
- Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York City, NY, United States; Division of Pulmonary, Allergy and Critical Care of Medicine, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York City, NY, United States
| | - Susan E Lloyd
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York City, NY, United States
| | - Janelle A Rivera
- Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York City, NY, United States; Division of Pulmonary, Allergy and Critical Care of Medicine, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York City, NY, United States
| | - Jacqueline Jezioro
- Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York City, NY, United States; Division of Pulmonary, Allergy and Critical Care of Medicine, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York City, NY, United States
| | - Jacob D McDonald
- Department of Toxicology, Lovelace Respiratory Research Institute, Albuquerque, NM, USA
| | - Masha Pitiranggon
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
| | - Beizhan Yan
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
| | - Matthias Szabolcs
- Department of Pathology, College of Physicians and Surgeons, Columbia University, New York City, NY, United States
| | - Mary Beth Terry
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York City, NY, United States; Herbert Irving Comprehensive Cancer Center, Columbia University, New York City, NY, United States
| | - Rachel L Miller
- Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York City, NY, United States; Division of Pulmonary, Allergy and Critical Care of Medicine, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York City, NY, United States; Herbert Irving Comprehensive Cancer Center, Columbia University, New York City, NY, United States.
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10
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Sajedi N, Homayoun M, Mohammadi F, Soleimani M. Myricetin Exerts its Apoptotic Effects on MCF-7 Breast Cancer Cells through Evoking the BRCA1-GADD45 Pathway. Asian Pac J Cancer Prev 2020; 21:3461-3468. [PMID: 33369440 PMCID: PMC8046300 DOI: 10.31557/apjcp.2020.21.12.3461] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 12/06/2020] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE Myricetin is a polyphenol flavonoid with nutraceutical values which is abundantly found as the main ingredient of various foods and beverages. It has been reported that the function of myricetin is to trigger apoptosis in several types of cancers. The present study intended to investigate the apoptotic effects of myricetin on MCF-7 breast cancer cells and to assess its possible mechanisms of action. MATERIALS AND METHODS MCF-7 breast cancer cells were assigned to four groups: Control (cells in normal condition); myricetin (cells treated with the IC50 dosage of myricetin) in three different incubation times (24, 48, and 72 h). The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, annexin V assay, flow cytometry, real-time polymerase chain reaction (PCR), and caspase-3 assay were used to estimate the apoptosis function of myricetin in breast cancer. RESULTS The expression levels of apoptosis-related genes caspase-3, caspase-8, caspase-9, and the BAX /Bcl-2 ratio as well as the expression of p53, BRCA1, GADD45 genes were significantly increased following the treatment of MCF-7 breast cancer cells with myricetin. The annexin V assay demonstrated the significant expression of annexin which was also detected by flow cytometry. CONCLUSION Myricetin efficiently induces apoptosis in MCF-7 breast cancer cells by evoking both extrinsic and intrinsic apoptotic pathways. Myricetin may exert its apoptotic effects on MCF-7 cells by inducing the BRCA1- GADD45 pathway. .
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Affiliation(s)
- Nayereh Sajedi
- Department of Anatomical Sciences, Isfahan University of Medical Sciences, Iran.
| | - Mansour Homayoun
- Department of Anatomical Sciences, Isfahan University of Medical Sciences, Iran.
| | | | - Mitra Soleimani
- Department of Anatomical Sciences, Isfahan University of Medical Sciences, Iran.
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11
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Deregulated estrogen receptor signaling and DNA damage response in breast tumorigenesis. Biochim Biophys Acta Rev Cancer 2020; 1875:188482. [PMID: 33260050 DOI: 10.1016/j.bbcan.2020.188482] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 11/05/2020] [Accepted: 11/12/2020] [Indexed: 02/07/2023]
Abstract
Carriers of BRCA1 mutations have a higher chance of developing cancers in hormone-responsive tissues like the breast, ovary and prostate, compared to other tissues. These tumors generally exhibit basal-like characters and do not express estrogen receptor (ER) or progesterone receptor (PR). Intriguingly, BRCA1 mutated breast cancers have a less favorable clinical outcome, as they will not respond to hormone therapy. BRCA1 has been reported to exhibit ligand dependent and independent transcriptional inhibition of ER-α; however, there exists a controversy on whether BRCA1 induces or inhibits ER-α expression. The mechanisms associated with resistance of BRCA1 mutated cancers to hormone therapy, as well as the tissue restriction exhibited by BRCA1 mutated tumors are still largely unknown. BRCA1 mutated tumors possess increased DNA damages and decreased genomic integrity, as BRCA1 plays a cardinal role in high fidelity DNA damage repair pathways, like homologous recombination (HR). The existence of cross regulatory signaling networks between ER-α and BRCA1 speculates a role of ER on BRCA1 dependent DDR pathways. Thus, the loss or haploinsufficiency of BRCA1 and the consequential deregulation of ER-α signaling may result in persistence of unrepaired DNA damages, eventually leading to tumorigenesis. Therefore, understanding of this cross-talk between ER-α and BRCA1, with regard to DDR, will provide critical insights to steer drug development and therapy for breast/ovarian cancers. This review discusses the mechanisms by which estrogen and ER signaling influence BRCA1 mediated DNA damage response and repair pathways in the mammalian system.
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12
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Compensatory Estrogen Signal Is Capable of DNA Repair in Antiestrogen-Responsive Cancer Cells via Activating Mutations. JOURNAL OF ONCOLOGY 2020; 2020:5418365. [PMID: 32774370 PMCID: PMC7407016 DOI: 10.1155/2020/5418365] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 04/30/2020] [Accepted: 06/25/2020] [Indexed: 02/08/2023]
Abstract
Cancer cells are embarrassed human cells exhibiting the remnants of same mechanisms for DNA stabilization like patients have in their healthy cells. Antiestrogens target the liganded activation of ERs, which is the principal means of genomic regulation in both patients and their tumors. The artificial blockade of liganded ER activation is an emergency situation promoting strong compensatory actions even in cancer cells. When tumor cells are capable of an appropriate upregulation of ER signaling resulting in DNA repair, a tumor response may be detected. In contrast, when ER signaling is completely inhibited, tumor cells show unrestrained proliferation, and tumor growth may be observed. The laboratory investigations of genomic mechanisms in antiestrogen-responsive and antiestrogen-unresponsive tumor cells have considerably enhanced our knowledge regarding the principal regulatory capacity of estrogen signaling. In antiestrogen-responsive tumor cells, a compensatory increased expression and liganded activation of estrogen receptors (ERs) result in an apoptotic death. Conversely, in antiestrogen resistant tumors exhibiting a complete blockade of liganded ER activation, a compensatory effort for unliganded ER activation is characteristic, conferred by the increased expression and activity of growth factor receptors. However, even extreme unliganded ER activation is incapable of DNA restoration when the liganded ER activation is completely blocked. Researchers mistakenly suspect even today that in tumors growing under antiestrogen treatment, the increased unliganded activation of estrogen receptor via activating mutations is an aggressive survival technique, whilst it is a compensatory effort against the blockade of liganded ER activation. The capacity of liganded ERs for genome modification in emergency states provides possibilities for estrogen/ER use in medical practice including cancer cure.
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13
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Chiang HC, Zhang X, Li J, Zhao X, Chen J, Wang HTH, Jatoi I, Brenner A, Hu Y, Li R. BRCA1-associated R-loop affects transcription and differentiation in breast luminal epithelial cells. Nucleic Acids Res 2019; 47:5086-5099. [PMID: 30982901 PMCID: PMC6547407 DOI: 10.1093/nar/gkz262] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 03/06/2019] [Accepted: 04/01/2019] [Indexed: 12/17/2022] Open
Abstract
BRCA1-associated basal-like breast cancer originates from luminal progenitor cells. Breast epithelial cells from cancer-free BRCA1 mutation carriers are defective in luminal differentiation. However, how BRCA1 deficiency leads to lineage-specific differentiation defect is not clear. BRCA1 is implicated in resolving R-loops, DNA-RNA hybrid structures associated with genome instability and transcriptional regulation. We recently showed that R-loops are preferentially accumulated in breast luminal epithelial cells of BRCA1 mutation carriers. Here, we interrogate the impact of a BRCA1 mutation-associated R-loop located in a putative transcriptional enhancer upstream of the ERα-encoding ESR1 gene. Genetic ablation confirms the relevance of this R-loop-containing region to enhancer-promoter interactions and transcriptional activation of the corresponding neighboring genes, including ESR1, CCDC170 and RMND1. BRCA1 knockdown in ERα+ luminal breast cancer cells increases intensity of this R-loop and reduces transcription of its neighboring genes. The deleterious effect of BRCA1 depletion on transcription is mitigated by ectopic expression of R-loop-removing RNase H1. Furthermore, RNase H1 overexpression in primary breast cells from BRCA1 mutation carriers results in a shift from luminal progenitor cells to mature luminal cells. Our findings suggest that BRCA1-dependent R-loop mitigation contributes to luminal cell-specific transcription and differentiation, which could in turn suppress BRCA1-associated tumorigenesis.
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Affiliation(s)
- Huai-Chin Chiang
- Department of Biochemistry & Molecular Medicine, School of Medicine & Health Sciences, The George Washington University, Washington, DC 20037, USA
| | - Xiaowen Zhang
- Department of Biochemistry & Molecular Medicine, School of Medicine & Health Sciences, The George Washington University, Washington, DC 20037, USA
| | - Jingwei Li
- Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Xiayan Zhao
- Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Jerry Chen
- Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Howard T-H Wang
- Department of Surgery, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Ismail Jatoi
- Department of Surgery, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Andrew Brenner
- Department of Medicine, The Mays Cancer Center, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Yanfen Hu
- Department of Anatomy & Cell Biology, School of Medicine & Health Sciences, The George Washington University, Washington, DC 20037, USA
| | - Rong Li
- Department of Biochemistry & Molecular Medicine, School of Medicine & Health Sciences, The George Washington University, Washington, DC 20037, USA
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14
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Abstract
The repair of DNA double-strand breaks occurs through a series of defined steps that are evolutionarily conserved and well-understood in most experimental organisms. However, it is becoming increasingly clear that repair does not occur in isolation from other DNA transactions. Transcription of DNA produces topological changes, RNA species, and RNA-dependent protein complexes that can dramatically influence the efficiency and outcomes of DNA double-strand break repair. The transcription-associated history of several double-strand break repair factors is reviewed here, with an emphasis on their roles in regulating R-loops and the emerging role of R-loops in coordination of repair events. Evidence for nucleolytic processing of R-loops is also discussed, as well as the molecular tools commonly used to measure RNA-DNA hybrids in cells.
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Affiliation(s)
- Tanya T Paull
- The Department of Molecular Biosciences and the Howard Hughes Medical Institute, The University of Texas at Austin, Austin, TX, USA
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15
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de Jonge MM, Ritterhouse LL, de Kroon CD, Vreeswijk MPG, Segal JP, Puranik R, Hollema H, Rookus MA, van Asperen CJ, van Leeuwen FE, Smit VTHBM, Howitt BE, Bosse T. Germline BRCA-Associated Endometrial Carcinoma Is a Distinct Clinicopathologic Entity. Clin Cancer Res 2019; 25:7517-7526. [PMID: 31492746 DOI: 10.1158/1078-0432.ccr-19-0848] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 06/05/2019] [Accepted: 08/20/2019] [Indexed: 11/16/2022]
Abstract
PURPOSE Whether endometrial carcinoma (EC) should be considered part of the gBRCA1/2-associated hereditary breast and ovarian cancer (HBOC) syndrome is topic of debate. We sought to assess whether ECs occurring in gBRCA carriers are enriched for clinicopathologic and molecular characteristics, thereby supporting a causal relationship. EXPERIMENTAL DESIGN Thirty-eight gBRCA carriers that developed EC were selected from the nationwide cohort study on hereditary breast and ovarian cancer in the Netherlands (HEBON), and these were supplemented with four institutional cases. Tumor tissue was retrieved via PALGA (Dutch Pathology Registry). Nineteen morphologic features were scored and histotype was determined by three expert gynecologic pathologists, blinded for molecular analyses (UCM-OncoPlus Assay including 1213 genes). ECs with LOH of the gBRCA-wild-type allele (gBRCA/LOHpos) were defined "gBRCA-associated," those without LOH (gBRCA/LOHneg) were defined "sporadic." RESULTS LOH could be assessed for 40 ECs (30 gBRCA1, 10 gBRCA2), of which 60% were gBRCA/LOHpos. gBRCA/LOHpos ECs were more frequently of nonendometrioid (58%, P = 0.001) and grade 3 histology (79%, P < 0.001). All but two were in the TP53-mutated TCGA-subgroup (91.7%, P < 0.001). In contrast, gBRCA/LOHneg ECs were mainly grade 1 endometrioid EC (94%) and showed a more heterogeneous distribution of TCGA-molecular subgroups: POLE-mutated (6.3%), MSI-high (25%), NSMP (62.5%), and TP53-mutated (6.3%). CONCLUSIONS We provide novel evidence in favor of EC being part of the gBRCA-associated HBOC-syndrome. gBRCA-associated ECs are enriched for EC subtypes associated with unfavorable clinical outcome. These findings have profound therapeutic consequences as these patients may benefit from treatment strategies such as PARP inhibitors. In addition, it should influence counseling and surveillance of gBRCA carriers.
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Affiliation(s)
- Marthe M de Jonge
- Department of Pathology, Leiden University Medical Center, Leiden, the Netherlands
| | - Lauren L Ritterhouse
- Division of Genomic and Molecular Pathology, Department of Pathology, The University of Chicago, Chicago, Illinois
| | - Cornelis D de Kroon
- Department of Gynaecology, Leiden University Medical Center, Leiden, the Netherlands
| | - Maaike P G Vreeswijk
- Department of Human Genetics, Leiden University Medical Center, Leiden, the Netherlands
| | - Jeremy P Segal
- Division of Genomic and Molecular Pathology, Department of Pathology, The University of Chicago, Chicago, Illinois
| | | | - Harry Hollema
- Department of Pathology, University Medical Center Groningen, Groningen, the Netherlands
| | - Matti A Rookus
- Department of Epidemiology, The Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Christi J van Asperen
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, the Netherlands
| | - Flora E van Leeuwen
- Department of Epidemiology, The Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Vincent T H B M Smit
- Department of Pathology, Leiden University Medical Center, Leiden, the Netherlands
| | - Brooke E Howitt
- Department of Pathology, Stanford University School of Medicine, Stanford, California
| | - Tjalling Bosse
- Department of Pathology, Leiden University Medical Center, Leiden, the Netherlands.
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16
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Militello AM, Zielli T, Boggiani D, Michiara M, Naldi N, Bortesi B, Zanelli P, Uliana V, Giuliotti S, Musolino A. Mechanism of Action and Clinical Efficacy of CDK4/6 Inhibitors in BRCA-Mutated, Estrogen Receptor-Positive Breast Cancers: Case Report and Literature Review. Front Oncol 2019; 9:759. [PMID: 31456944 PMCID: PMC6700293 DOI: 10.3389/fonc.2019.00759] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 07/29/2019] [Indexed: 11/28/2022] Open
Abstract
Sensitivity to endocrine therapy of patients with estrogen receptor (ER)-positive metastatic breast cancer and germline BRCA1/2 mutations is not yet fully elucidated. Furthermore, the registration trials of CDK 4/6 inhibitors in combination with endocrine therapy lacked of a pre-specified subgroup analysis in BRCA1/2 mutation carriers. We report clinical history of two patients with BRCA-mutated, ER-positive metastatic breast cancer treated with letrozole plus the CDK 4/6 inhibitor palbociclib. Biological and clinical implications of the treatment outcome observed in the two cases are discussed with the knowledge of scientific evidence to date available. Overall, biological rationale, preclinical, and clinical data support the prominent role of CDK 4/6 inhibitors plus endocrine therapy, even in combination with PARP inhibitors, in the treatment of BRCA-mutated, ER-positive breast cancers. However, the interaction between Cyclin/CDK pathway, ER and BRCA is complex and evidences reported so far, albeit reliable, await confirmation in the context of future randomized clinical trials.
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Affiliation(s)
- Anna Maria Militello
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy
| | - Teresa Zielli
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy
| | - Daniela Boggiani
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy
| | - Maria Michiara
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy
| | - Nadia Naldi
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy
| | - Beatrice Bortesi
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy
| | - Paola Zanelli
- Medical Genetics Unit, University Hospital of Parma, Parma, Italy
| | - Vera Uliana
- Medical Genetics Unit, University Hospital of Parma, Parma, Italy
| | - Sara Giuliotti
- Radiology Unit, University Hospital of Parma, Parma, Italy
| | - Antonino Musolino
- Breast Unit and Cancer Genetics Service, University Hospital of Parma, Parma, Italy.,Gruppo Oncologico Italiano di Ricerca Clinica (GOIRC), Parma, Italy
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17
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Macedo GS, Alemar B, Ashton-Prolla P. Reviewing the characteristics of BRCA and PALB2-related cancers in the precision medicine era. Genet Mol Biol 2019; 42:215-231. [PMID: 31067289 PMCID: PMC6687356 DOI: 10.1590/1678-4685-gmb-2018-0104] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 10/24/2018] [Indexed: 12/24/2022] Open
Abstract
Germline mutations in BRCA1 and BRCA2 (BRCA) genes confer high risk of developing cancer, especially breast and ovarian tumors. Since the cloning of these tumor suppressor genes over two decades ago, a significant amount of research has been done. Most recently, monoallelic loss-of-function mutations in PALB2 have also been shown to increase the risk of breast cancer. The identification of BRCA1, BRCA2 and PALB2 as proteins involved in DNA double-strand break repair by homologous recombination and of the impact of complete loss of BRCA1 or BRCA2 within tumors have allowed the development of novel therapeutic approaches for patients with germline or somatic mutations in said genes. Despite the advances, especially in the clinical use of PARP inhibitors, key gaps remain. Now, new roles for BRCA1 and BRCA2 are emerging and old concepts, such as the classical two-hit hypothesis for tumor suppression, have been questioned, at least for some BRCA functions. Here aspects regarding cancer predisposition, cellular functions, histological and genomic findings in BRCA and PALB2-related tumors will be presented, in addition to an up-to-date review of the evolution and challenges in the development and clinical use of PARP inhibitors.
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Affiliation(s)
- Gabriel S Macedo
- Post-Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.,Precision Medicine Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Barbara Alemar
- Post-Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Patricia Ashton-Prolla
- Post-Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.,Precision Medicine Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
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18
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Gilbertson M, Brophy J. Causality Advocacy: Workers' Compensation Cases as Resources for Identifying and Preventing Diseases of Modernity. New Solut 2018; 28:704-725. [PMID: 30463468 DOI: 10.1177/1048291118810900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
An appeal process for an injured worker compensation case is a unique opportunity to debate and integrate evidence concerning a potential causal relationship between observations of occupational disease and exposures to various putative risk factors that may also be of significance in public health protection. Through application of Hill's indicia to the evidence presented in a recent appeal process concerning a breast cancer case for a female border guard, a novel epidemic, tentatively called "occupational BRCAness" has been identified and a causal relationship with exposures to traffic-related air pollution and shift work and possibly secondhand tobacco smoke is inferred. Application of the audit method by worker advocates to other compensation appeals processes for other diseases might similarly yield causal relations with exposures to occupational risk factors with relevance to public health.
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Affiliation(s)
- Michael Gilbertson
- 1 Occupational and Environmental Health Research Group, Centre for Public Health and Population Health Research, University of Stirling, Scotland, UK
| | - James Brophy
- 1 Occupational and Environmental Health Research Group, Centre for Public Health and Population Health Research, University of Stirling, Scotland, UK.,2 Department of Sociology, Anthropology, and Criminology, University of Windsor, Ontario, Canada
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19
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Alothman SJ, Wang W, Goerlitz DS, Islam M, Zhong X, Kishore A, Azhar RI, Kallakury BV, Furth PA. Responsiveness of Brca1 and Trp53 Deficiency-Induced Mammary Preneoplasia to Selective Estrogen Modulators versus an Aromatase Inhibitor in Mus musculus. Cancer Prev Res (Phila) 2017; 10:244-254. [PMID: 28283467 DOI: 10.1158/1940-6207.capr-16-0268] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 01/10/2017] [Accepted: 02/17/2017] [Indexed: 11/16/2022]
Abstract
An intervention study initiated at age 4 months compared the impact of tamoxifen (25 mg), raloxifene (22.5 mg), and letrozole (2.5 mg) administered by 60-day release subcutaneous pellet on mammary preneoplasia prevalence at age 6 months in conditional genetically engineered mouse models with different Breast cancer 1 (Brca1) gene dosages targeted to mammary epithelial cells and germline Tumor protein P53 (Trp53) haploinsufficiency (10-16/cohort). The proportion of unexposed control mice demonstrating mammary preneoplasia at age 6 months was highest in Brca1fl11/fl11/Cre/p53-/+ (54%) mice followed by Brca1WT/fl11/Cre/p53-/+ mice (30%). By age 12 months, invasive mammary cancers appeared in 80% of Brca1fl11/fl11/Cre/p53-/+ and 42% of Brca1WT/fl11/Cre/p53-/+ control unexposed mice. The spectrum of cancer histology was similar in both models without somatic mutation of the nongenetically engineered Brca1, Trp53, Brca2, or Death-associated protein kinase 3 (Dapk3) alleles. Two-month exposure to tamoxifen, raloxifene, and letrozole significantly reduced estrogen-mediated tertiary branching by 65%, 71%, and 78%, respectively, in Brca1fl11/fl11/Cre/p53-/+ mice at age 6 months. However, only letrozole significantly reduced hyperplastic alveolar nodules (HAN) prevalence (by 52%) and number (by 30%) and invasive cancer appeared despite tamoxifen exposure. In contrast, tamoxifen significantly reduced HAN number by 95% in Brca1WT/fl11/Cre/p53-/+ mice. Control mice with varying combinations of the different genetically modified alleles and MMTV-Cre transgene demonstrated that the combination of Brca1 insufficiency and Trp53 haploinsufficiency was required for appearance of preneoplasia and no individual genetic alteration confounded the response to tamoxifen. In summary, although specific antihormonal approaches showed effectiveness, with Brca1 gene dosage implicated as a possible modifying variable, more effective chemopreventive approaches for Brca1 mutation-induced cancer may require alternative and/or additional agents. Cancer Prev Res; 10(4); 244-54. ©2017 AACR.
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Affiliation(s)
- Sahar J Alothman
- Graduate School of Arts and Science, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC.,Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Weisheng Wang
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - David S Goerlitz
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Md Islam
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Xiaogang Zhong
- Department of Biostatistics, Bioinformatics & Biomathematics, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Archana Kishore
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Redha I Azhar
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Bhaskar V Kallakury
- Department of Pathology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC.,Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
| | - Priscilla A Furth
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC. .,Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC.,Department of Medicine, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC
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20
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Jiang C, Starr S, Chen F, Wu J. Low-fidelity alternative DNA repair carcinogenesis theory may interpret many cancer features and anticancer strategies. Future Oncol 2016; 12:1897-910. [PMID: 27166654 DOI: 10.2217/fon-2016-0066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have proposed that the low-fidelity compensatory backup alternative DNA repair pathways drive multistep carcinogenesis. Here, we apply it to interpret the clinical features of cancer, such as mutator phenotype, tissue specificity, age specificity, diverse types of cancers originated from the same type of tissue, cancer susceptibility of patients with DNA repair-defective syndromes, development of cancer only for a selected number of individuals among those that share the same genetic defect, invasion and metastasis. Clinically, the theory predicts that to improve the efficacy of molecular targeted or synthetic lethal therapy, it may be crucial to inhibit the low-fidelity compensatory alternative DNA repair either directly or by blocking the signal transducers of the sustained microenvironmental stress.
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Affiliation(s)
- Chuo Jiang
- School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China.,Central Laboratories, Xuhui Central Hospital, Shanghai Clinical Center, Chinese Academy of Sciences, 966 Middle Huaihai Road, Shanghai 200031, China
| | - Shane Starr
- Department of Pathology & Laboratory Medicine, Brody School of Medicine, East Carolina University, 600 Moye Boulevard, Greenville, North Carolina 27834, USA and currently Flint Medical Laboratory, 3490 Calkins Road, Flint, MI 48532, USA
| | - Fuxue Chen
- School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Jiaxi Wu
- Central Laboratories, Xuhui Central Hospital, Shanghai Clinical Center, Chinese Academy of Sciences, 966 Middle Huaihai Road, Shanghai 200031, China.,Department of Pathology & Laboratory Medicine, Brody School of Medicine, East Carolina University, 600 Moye Boulevard, Greenville, North Carolina 27834, USA and currently Flint Medical Laboratory, 3490 Calkins Road, Flint, MI 48532, USA
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21
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Ho MF, Bongartz T, Liu M, Kalari KR, Goss PE, Shepherd LE, Goetz MP, Kubo M, Ingle JN, Wang L, Weinshilboum RM. Estrogen, SNP-Dependent Chemokine Expression and Selective Estrogen Receptor Modulator Regulation. Mol Endocrinol 2016; 30:382-98. [PMID: 26866883 DOI: 10.1210/me.2015-1267] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
We previously reported, on the basis of a genome-wide association study for aromatase inhibitor-induced musculoskeletal symptoms, that single-nucleotide polymorphisms (SNPs) near the T-cell leukemia/lymphoma 1A (TCL1A) gene were associated with aromatase inhibitor-induced musculoskeletal pain and with estradiol (E2)-induced TCL1A expression. Furthermore, variation in TCL1A expression influenced the downstream expression of proinflammatory cytokines and cytokine receptors. Specifically, the top hit genome-wide association study SNP, rs11849538, created a functional estrogen response element (ERE) that displayed estrogen receptor (ER) binding and increased E2 induction of TCL1A expression only for the variant SNP genotype. In the present study, we pursued mechanisms underlying the E2-SNP-dependent regulation of TCL1A expression and, in parallel, our subsequent observations that SNPs at a distance from EREs can regulate ERα binding and that ER antagonists can reverse phenotypes associated with those SNPs. Specifically, we performed a series of functional genomic studies using a large panel of lymphoblastoid cell lines with dense genomic data that demonstrated that TCL1A SNPs at a distance from EREs can modulate ERα binding and expression of TCL1A as well as the expression of downstream immune mediators. Furthermore, 4-hydroxytamoxifen or fulvestrant could reverse these SNP-genotype effects. Similar results were found for SNPs in the IL17A cytokine and CCR6 chemokine receptor genes. These observations greatly expand our previous results and support the existence of a novel molecular mechanism that contributes to the complex interplay between estrogens and immune systems. They also raise the possibility of the pharmacological manipulation of the expression of proinflammatory cytokines and chemokines in a SNP genotype-dependent fashion.
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Affiliation(s)
- Ming-Fen Ho
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Tim Bongartz
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Mohan Liu
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Krishna R Kalari
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Paul E Goss
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Lois E Shepherd
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Matthew P Goetz
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Michiaki Kubo
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - James N Ingle
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Liewei Wang
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
| | - Richard M Weinshilboum
- Division of Clinical Pharmacology (M.-F.H., M.L., L.W., R.M.W.), Department of Molecular Pharmacology and Experimental Therapeutics, Division of Rheumatology (M.-F.H., T.B.), Department of Medicine, Division of Biomedical Statistics and Informatics (K.R.K.), Department of Health Sciences Research, and Division of Medical Oncology (M.P.G., J.N.I.), Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Division of Hematology/Oncology (P.E.G.), Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard University, Boston, Massachusetts 02114; National Cancer Institute of Canada Clinical Trials Group (L.E.S.), Kingston, Ontario, Canada K7L 3N6; and RIKEN Center for Integrative Medical Science (M.K.), Yokohama 230-0045, Japan
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Romagnolo DF, Papoutsis AJ, Laukaitis C, Selmin OI. Constitutive expression of AhR and BRCA-1 promoter CpG hypermethylation as biomarkers of ERα-negative breast tumorigenesis. BMC Cancer 2015; 15:1026. [PMID: 26715507 PMCID: PMC4696163 DOI: 10.1186/s12885-015-2044-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 12/23/2015] [Indexed: 12/15/2022] Open
Abstract
Background Only 5–10 % of breast cancer cases is linked to germline mutations in the BRCA-1 gene and occurs early in life. Conversely, sporadic breast tumors, which represent 90-95 % of breast malignancies, have lower BRCA-1 expression, but not mutated BRCA-1 gene, and tend to occur later in life in combination with other genetic alterations and/or environmental exposures. The latter may include environmental and dietary factors that activate the aromatic hydrocarbon receptor (AhR). Therefore, understanding if changes in expression and/or activation of the AhR are associated with somatic inactivation of the BRCA-1 gene may provide clues for breast cancer therapy. Methods We evaluated Brca-1 CpG promoter methylation and expression in mammary tumors induced in Sprague–Dawley rats with the AhR agonist and mammary carcinogen 7,12-dimethyl-benzo(a)anthracene (DMBA). Also, we tested in human estrogen receptor (ER)α-negative sporadic UACC-3199 and ERα-positive MCF-7 breast cancer cells carrying respectively, hyper- and hypomethylated BRCA-1 gene, if the treatment with the AhR antagonist α-naphthoflavone (αNF) modulated BRCA-1 and ERα expression. Finally, we examined the association between expression of AhR and BRCA-1 promoter CpG methylation in human triple-negative (TNBC), luminal-A (LUM-A), LUM-B, and epidermal growth factor receptor-2 (HER-2)-positive breast tumor samples. Results Mammary tumors induced with DMBA had reduced BRCA-1 and ERα expression; higher Brca-1 promoter CpG methylation; increased expression of Ahr and its downstream target Cyp1b1; and higher proliferation markers Ccnd1 (cyclin D1) and Cdk4. In human UACC-3199 cells, low BRCA-1 was paralleled by constitutive high AhR expression; the treatment with αNF rescued BRCA-1 and ERα, while enhancing preferential expression of CYP1A1 compared to CYP1B1. Conversely, in MCF-7 cells, αNF antagonized estradiol-dependent activation of BRCA-1 without effects on expression of ERα. TNBC exhibited increased basal AhR and BRCA-1 promoter CpG methylation compared to LUM-A, LUM-B, and HER-2-positive breast tumors. Conclusions Constitutive AhR expression coupled to BRCA-1 promoter CpG hypermethylation may be predictive markers of ERα-negative breast tumor development. Regimens based on selected AhR modulators (SAhRMs) may be useful for therapy against ERα-negative tumors, and possibly, TNBC with increased AhR and hypermethylated BRCA-1 gene.
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Affiliation(s)
- Donato F Romagnolo
- Department of Nutritional Sciences, The University of Arizona, 303 Shantz Bldg, Tucson, AZ, 85721-0038, USA. .,The University of Arizona Cancer Center, 1515 N. Campbell Avenue, 3999A, Tucson, AZ, 85724-5024, USA.
| | - Andreas J Papoutsis
- Department of Nutritional Sciences, The University of Arizona, 303 Shantz Bldg, Tucson, AZ, 85721-0038, USA.
| | - Christina Laukaitis
- Department of Nutritional Sciences, The University of Arizona, 303 Shantz Bldg, Tucson, AZ, 85721-0038, USA. .,The University of Arizona Cancer Center, 1515 N. Campbell Avenue, 3999A, Tucson, AZ, 85724-5024, USA. .,Department of Medicine, University of Arizona College of Medicine, The University of Arizona, Tucson, AZ, USA.
| | - Ornella I Selmin
- Department of Nutritional Sciences, The University of Arizona, 303 Shantz Bldg, Tucson, AZ, 85721-0038, USA. .,The University of Arizona Cancer Center, 1515 N. Campbell Avenue, 3999A, Tucson, AZ, 85724-5024, USA.
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23
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Assessing Heavy Metal and PCB Exposure from Tap Water by Measuring Levels in Plasma from Sporadic Breast Cancer Patients, a Pilot Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2015; 12:15683-91. [PMID: 26690196 PMCID: PMC4690949 DOI: 10.3390/ijerph121215013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 11/19/2015] [Accepted: 12/03/2015] [Indexed: 11/17/2022]
Abstract
Breast cancer (BrCA) is the most common cancer affecting women around the world. However, it does not arise from the same causative agent among all women. Genetic markers have been associated with heritable or familial breast cancers, which may or may not be confounded by environmental factors, whereas sporadic breast cancer cases are more likely attributable to environmental exposures. Approximately 85% of women diagnosed with BrCA have no family history of the disease. Given this overwhelming bias, more plausible etiologic mechanisms should be investigated to accurately assess a woman’s risk of acquiring breast cancer. It is known that breast cancer risk is highly influenced by exogenous environmental cues altering cancer genes either by genotoxic mechanisms (DNA mutations) or otherwise. Risk assessment should comprehensively incorporate exposures to exogenous factors that are linked to a woman’s individual susceptibility. However, the exact role that some environmental agents (EA) play in tumor formation and/or cancer gene regulation is unclear. In this pilot project, we begin a multi-disciplinary approach to investigate the intersection of environmental exposures, cancer gene response, and BrCA risk. Here, we present data that show environmental exposure to heavy metals and PCBs in drinking water, heavy metal presence in plasma of nine patients with sporadic BrCA, and Toxic Release Inventory and geological data for a metal of concern, uranium, in Northeast Georgia.
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Suba Z. The pitfall of the transient, inconsistent anticancer capacity of antiestrogens and the mechanism of apparent antiestrogen resistance. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:4341-53. [PMID: 26273195 PMCID: PMC4532170 DOI: 10.2147/dddt.s89536] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Although antiestrogens have been available for breast cancer therapy since the early 1970s, neither their inconsistent anticancer capacity nor the developing antiestrogen resistance of tumors can be fully understood. Although clinical and experimental investigations revealed many tiny details concerning the link between estrogen signaling and tumor development, they yielded fairly controversial findings. Estrogen receptor (ER) overexpression in tumor cells induced by estrogen treatment was erroneously regarded as a promoter of DNA damage, genomic instability, and tumor growth. Similarly, compensatory ER overexpression caused by antiestrogen treatment or estrogen withdrawal was mistakenly evaluated as a key for rapid tumor growth attributed to acquired antiestrogen resistance. Nevertheless, ER upregulation induced by estrogen treatment is a physiologic process even in tumor cells, whereas in the case of antiestrogen administration, it is a contraregulatory action to defend the endangered estrogen signaling. Upregulation of estrogen signaling displays a unique dichotomy, ensuring the survival and safe proliferative activity of healthy cells, while inducing apoptotic death of malignant tumor cells. Analysis of the fairly controversial results justifies that whatever type of available endocrine therapies may be used, including estrogen, antiestrogen treatment, or oophorectomy, an extreme upregulation of ER signaling seems to be the crucial mechanism of successful prevention and treatment for breast cancer. The inconsistent therapeutic effects of antiestrogen administration may be explained by the different genetic capacities of patients for the compensatory upregulation of ER and aromatase enzyme expressions. The weaker the defensive counteraction against the inhibition of estrogen signaling, the poorer is the prognosis of the disease. De novo or acquired antiestrogen resistance of tumors may be associated with the missing capacity of patients for the extreme upregulation of estrogen signaling or with the exhaustion of defensive counteractions in cases that previously showed good reactivity. High-dose estrogen treatment is capable of restoring ER signaling and anticancer capacity even after heavy exposure to antiestrogen therapy.
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Affiliation(s)
- Zsuzsanna Suba
- National Institute of Oncology, Surgical and Molecular Tumor Pathology Centre, Budapest, Hungary
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Suba Z. DNA stabilization by the upregulation of estrogen signaling in BRCA gene mutation carriers. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:2663-75. [PMID: 26028963 PMCID: PMC4440422 DOI: 10.2147/dddt.s84437] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Currently available scientific evidence erroneously suggests that mutagenic weakness or loss of the BRCA1/2 genes may liberate the proliferative effects of estrogen signaling, which provokes DNA damage and genomic instability. Conversely, BRCA mutation seems to be an imbalanced defect, crudely inhibiting the upregulation of estrogen receptor expression and liganded transcriptional activity, whereas estrogen receptor-repressor functions become predominant. In BRCA-proficient cases, estrogen signaling orchestrates the activity of cell proliferation and differentiation with high safety, while upregulating the expression and DNA-stabilizing impact of BRCA genes. In turn, BRCA proteins promote estrogen signaling by proper estrogen synthesis via CYP19 gene regulation and by induction of the appropriate expression and transcriptional activity of estrogen receptors. In this exquisitely organized regulatory system, the dysfunction of each player may jeopardize genome stability and lead to severe chronic diseases, such as cancer development. Female organs, such as breast, endometrium, and ovary, exhibiting regular cyclic proliferative activity are particularly vulnerable in case of disturbances in either estrogen signaling or BRCA-mediated DNA repair. BRCA mutation carrier women may apparently be healthy or exhibit clinical signs of deficient estrogen signaling in spite of hyperestrogenism. Even women who enjoy sufficient compensatory DNA-defending activities are at risk of tumor development because many endogenous and environmental factors may jeopardize the mechanisms of extreme compensatory processes. Natural estrogens have numerous benefits in tumor prevention and therapy even in BRCA mutation carriers. There are no toxic effects even in sky-high doses and all physiologic cellular functions are strongly upregulated, while malignant tumor cells are recognized and killed in a Janus-faced manner.
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Affiliation(s)
- Zsuzsanna Suba
- Surgical and Molecular Tumor Pathology Centre, National Institute of Oncology, Budapest, Hungary
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Wang X, Li S. Chromatin immunoprecipitation-sequencing predicts p300 binding sites in the MCF7 human breast cancer cell line. Int J Mol Med 2015; 35:973-8. [PMID: 25625638 DOI: 10.3892/ijmm.2015.2081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 12/02/2014] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to identify the distribution characters of p300 binding sites in estradiol (E2) stimulated MCF7 cell lines and controls, and to study the roles of transcriptional coactivator p300 in the tumorigenesis and progression of various human cancers following E2 stimulation. The chromatin immunoprecipitation followed by sequencing data of GSES9623 was downloaded from the Gene Expression Omnibus database, including breast cancer data of GSM986085 and control data of GSM986087. MACS peak‑calling software was employed to identify the p300‑bound sites in the two groups. The differential target genes of p300‑bound sites were further analyzed and the concordant factors were predicted. The Gene Ontology (GO) was used to conduct functional enrichment analysis. There were 32,249 p300 binding sites identified in the E2 stimulation group and 43,156 in the control group. GO enrichment analysis of the target genes showed that p300‑regulated target genes mainly participated in the neural cell differentiation‑associated biology process; while in the E2 stimulation group, partial functions of the target genes had changed. A total of 24,899 differential p300‑bound sites of the two groups were identified and GO enrichment analysis demonstrated that E2 stimulation changed p300 binding sites, but did not influence the regulatory function of p300. The effect of E2 in the MCF7 cells suggested that E2 affected the binding affinity of DNA and transcription factors in a large scale. By analyzing the concordant factors, several important factors were discovered, such as BRCA1 and ESR1. Overall, the results of the present study suggested an association between p300 and carcinogenic genes. This may provide theoretical guidance for cancer therapy.
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Affiliation(s)
- Xiemei Wang
- Department of Radiation Medicine and Tumor Research, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Shaolin Li
- Department of Radiation Medicine and Tumor Research, Chongqing Medical University, Chongqing 400016, P.R. China
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Manavathi B, Samanthapudi VSK, Gajulapalli VNR. Estrogen receptor coregulators and pioneer factors: the orchestrators of mammary gland cell fate and development. Front Cell Dev Biol 2014; 2:34. [PMID: 25364741 PMCID: PMC4207046 DOI: 10.3389/fcell.2014.00034] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 07/21/2014] [Indexed: 12/14/2022] Open
Abstract
The steroid hormone, 17β-estradiol (E2), plays critical role in various cellular processes such as cell proliferation, differentiation, migration and apoptosis, and is essential for reproduction and mammary gland development. E2 actions are mediated by two classical nuclear hormone receptors, estrogen receptor α and β (ERs). The activity of ERs depends on the coordinated activity of ligand binding, post-translational modifications (PTMs), and importantly the interaction with their partner proteins called “coregulators.” Because coregulators are proved to be crucial for ER transcriptional activity, and majority of breast cancers are ERα positive, an increased interest in the field has led to the identification of a large number of coregulators. In the last decade, gene knockout studies using mouse models provided impetus to our further understanding of the role of these coregulators in mammary gland development. Several coregulators appear to be critical for terminal end bud (TEB) formation, ductal branching and alveologenesis during mammary gland development. The emerging studies support that, coregulators along with the other ER partner proteins called “pioneer factors” together contribute significantly to E2 signaling and mammary cell fate. This review discusses emerging themes in coregulator and pioneer factor mediated action on ER functions, in particular their role in mammary gland cell fate and development.
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Affiliation(s)
- Bramanandam Manavathi
- Department of Biochemistry, School of Life Sciences, University of Hyderabad Hyderabad, India
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28
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Yu JH, Lee JW, Son BH, Kim SW, Park SK, Lee MH, Kim LS, Noh WC, Kim EK, Yoon DS, Lee J, Jung JH, Jung SS, Gong G, Ahn SH. Characteristics of BRCA1/2 Mutation-Positive Breast Cancers in Korea: A Comparison Study Based on Multicenter Data and the Korean Breast Cancer Registry. J Breast Cancer 2014; 17:129-35. [PMID: 25013433 PMCID: PMC4090314 DOI: 10.4048/jbc.2014.17.2.129] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 05/14/2014] [Indexed: 12/19/2022] Open
Abstract
Purpose Mutations in BRCA genes are the main cause of hereditary breast cancer in Korea. The aim of this study was to investigate the characteristics of breast cancers involving BRCA1 (BRCA1 group) and BRCA2 (BRCA2 group) mutations. Methods We retrospectively reviewed the medical records of patients with BRCA1 (BRCA1 group) or BRCA2 (BRCA2 group) mutation positive breast cancer from multiple centers and compared the data to that of the Korean Breast Cancer Society registry (registry group). Results The patients of the BRCA1 group were diagnosed at a younger age (median age, 37 years) and had tumors of higher histological (61.3% with histological grade 3) and nuclear (37.5% with nuclear grade 3) grade than those of the registry group. In addition, the frequency of ductal carcinoma in situ in the BRCA1 group was lower (3.7%) than in the registry group, and the BRCA1 group were more likely to be triple-negative breast cancer (61.3%). Patients in the BRCA2 group were also younger at diagnosis (mean age, 41 years) and were more likely to have involvement of the axillary node than the registry group (45.5% vs. 33.5%, p=0.002). The BRCA1 and BRCA2 groups did not show a correlation between tumor size and axillary node involvement. Conclusion We report the characteristics of BRCA mutation positive breast cancer patients in the Korean population through multicenter data and nation-wide breast cancer registry study. However, BRCA-mutated breast cancers appear highly complex, and further research on their molecular basis is needed in Korea.
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Affiliation(s)
- Jong-Han Yu
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jong Won Lee
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Byung Ho Son
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sung-Won Kim
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Sue K Park
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Min Hyuk Lee
- Department of Surgery, Soonchunhyang University Hospital, Soonchunhyang University College of Medicine, Seoul, Korea
| | - Lee Su Kim
- Department of Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea
| | - Woo-Chul Noh
- Department of Surgery, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Science, Seoul, Korea
| | - Eun-Kyu Kim
- Department of Surgery, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Science, Seoul, Korea
| | - Dae Sung Yoon
- Department of Surgery, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Korea
| | - Jeeyeon Lee
- Department of Surgery, Medical Research Institute, Pusan National University Hospital, Pusan, Korea
| | - Jin Hyang Jung
- Department of Surgery, Kyungpook National University Hospital, Kyungpook National University College of Medicine, Daegu, Korea
| | - Sang Seol Jung
- Department of Surgery, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea
| | - Gyungyup Gong
- Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sei-Hyun Ahn
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Wang L, Di LJ. BRCA1 and estrogen/estrogen receptor in breast cancer: where they interact? Int J Biol Sci 2014; 10:566-75. [PMID: 24910535 PMCID: PMC4046883 DOI: 10.7150/ijbs.8579] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 03/24/2014] [Indexed: 01/08/2023] Open
Abstract
BRCA1 mainly acts as a tumor suppressor and BRCA1 mutation correlates with increased cancer risk. Although it is well recognized that BRCA1 related tumorigenesis is mainly caused by the increased DNA damage and decreased genome stability, it is not clear that why BRCA1 related patients have higher risk for cancer development mainly in estrogen responsive tissues such as breast and ovary. Recent studies suggested that BRCA1 and E-ER (estrogen and estrogen receptor) signaling synergistically regulate the mammary epithelial cell proliferation and differentiation. In this current presentation, we reviewed the correlation between mammary gland epithelial cell transformation and the status of BRCA1 and ER. Then the mechanisms of BRCA1 and E-ER interaction at both gene transcription level and protein-protein interaction level are discussed. Furthermore, the tumorigenic mechanisms are discussed by focusing on the synergistic effect of BRCA1 and E-ER on cell metabolism, ROS management, and antioxidant activity in mammary gland epithelial cells. Also, the possibility of cell de-differentiation promoted by coordinated effect between BRCA1 mutation and E-ER signal is explored. Together, the currently available evidences suggest that BRCA1 mutation and E-ER signal together, contribute to breast tumorigenesis by providing the metabolic support for cancer cell growth and even may directly be involved in promoting the de-differentiation of cancer-prone epithelial cells.
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Affiliation(s)
- Li Wang
- Faculty of health sciences, University of Macau, SAR of People's Republic of China
| | - Li-Jun Di
- Faculty of health sciences, University of Macau, SAR of People's Republic of China
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Baldacchino S, Saliba C, Petroni V, Fenech AG, Borg N, Grech G. Deregulation of the phosphatase, PP2A is a common event in breast cancer, predicting sensitivity to FTY720. EPMA J 2014; 5:3. [PMID: 24460909 PMCID: PMC3913630 DOI: 10.1186/1878-5085-5-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 01/09/2014] [Indexed: 01/01/2023]
Abstract
Background The most commonly used biomarkers to predict the response of breast cancer patients to therapy are the oestrogen receptor (ER), progesterone receptor (PgR), and human epidermal growth factor receptor 2 (HER2). Patients positive for these biomarkers are eligible for specific therapies such as endocrine treatment in the event of ER and PgR positivity, and the monoclonal antibody, trastuzumab, in the case of HER2-positive patients. Patients who are negative for these three biomarkers, the so-called triple negatives, however, derive little benefit from such therapies and are associated with a worse prognosis. Deregulation of the protein serine/threonine phosphatase type 2A (PP2A) and its regulatory subunits is a common event in breast cancer, providing a possible target for therapy. Methods The data portal, cBioPortal for Cancer Genomics was used to investigate the incidence of conditions that are associated with low phosphatase activity. Four (4) adherent human breast cancer cell lines, MDA-MB-468, MDA-MB-436, Hs578T and BT-20 were cultured to assess their viability when exposed to various dosages of rapamycin or FTY720. In addition, RNA was extracted and cDNA was synthesised to amplify the coding sequence of PPP2CA. Amplification was followed by high-resolution melting to identify variations. Results and conclusion The sequence of PPP2CA was found to be conserved across a diverse panel of solid tumour and haematological cell lines, suggesting that low expression of PPP2CA and differential binding of inhibitory PPP2CA regulators are the main mechanisms of PP2A deregulation. Interestingly, the cBioPortal for Cancer Genomics shows that PP2A is deregulated in 59.6% of basal breast tumours. Viability assays performed to determine the sensitivity of a panel of breast cancer cell lines to FTY720, a PP2A activator, indicated that cell lines associated with ER loss are sensitive to lower doses of FTY720. The subset of patients with suppressed PP2A activity is potentially eligible for treatment using therapies which target the PI3K/AKT/mTOR pathway, such as phosphatase activators.
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Affiliation(s)
- Shawn Baldacchino
- Department of Pathology, Medical School, University of Malta, Msida MSD2090, Malta
| | - Christian Saliba
- Department of Pathology, Medical School, University of Malta, Msida MSD2090, Malta
| | - Vanessa Petroni
- Department of Clinical Pharmacology and Therapeutics, University of Malta, Msida MSD2090, Malta
| | - Anthony G Fenech
- Department of Clinical Pharmacology and Therapeutics, University of Malta, Msida MSD2090, Malta
| | - Nigel Borg
- Department of Pathology, Medical School, University of Malta, Msida MSD2090, Malta
| | - Godfrey Grech
- Department of Pathology, Medical School, University of Malta, Msida MSD2090, Malta
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Loss of glucocorticoid receptor activation is a hallmark of BRCA1-mutated breast tissue. Breast Cancer Res Treat 2013; 142:283-96. [PMID: 24166279 DOI: 10.1007/s10549-013-2722-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 10/03/2013] [Indexed: 12/27/2022]
Abstract
Glucocorticoids (GCs) regulate cell homeostasis and can affect carcinogenesis. An inherited germline mutation in the BRCA1 gene, a tumor suppressor gene, confers a predisposition to breast and ovarian cancers. BRCA1 participates in the maintenance of genome stability through DNA repair, in cellular homeostasis through gene transcription, and in signaling regulation. The interaction between BRCA1 and the glucocorticoid receptor (GR) signaling pathway was studied in normal breast tissues and triple-negative breast cancers from BRCA1 mutation carriers. A loss of the active Ser211 phosphorylated form of GR was found in the mutant as compared to the non-mutant. In in vitro studies, the BRCA1 status in breast cancer cell lines regulates GC-dependent proliferation/apoptosis and impacts GC-dependent gene expression. The lack of BRCA1 inhibited dexamethasone actions on its target genes' expression and the opposite effect was seen with BRCA1 overexpression. BRCA1 overexpression enhances MAPK p38 phosphorylation, resulting in an amplification of GR phosphorylation on Ser 211 and GR basal expression. Our results indicate that BRCA1 is essential to develop an efficient GC signalization. GR P-Ser211 levels may constitute an important diagnostic factor for screening BRCA1 loss of expression in tumors from BRCA1 mutation carriers as well as in sporadic BRCAness tumors. This marker may help to optimize therapeutic strategies.
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Chapa J, Bourgo RJ, Greene GL, Kulkarni S, An G. Examining the pathogenesis of breast cancer using a novel agent-based model of mammary ductal epithelium dynamics. PLoS One 2013; 8:e64091. [PMID: 23704974 PMCID: PMC3660364 DOI: 10.1371/journal.pone.0064091] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Accepted: 04/08/2013] [Indexed: 02/06/2023] Open
Abstract
The study of the pathogenesis of breast cancer is challenged by the long time-course of the disease process and the multi-factorial nature of generating oncogenic insults. The characterization of the longitudinal pathogenesis of malignant transformation from baseline normal breast duct epithelial dynamics may provide vital insight into the cascading systems failure that leads to breast cancer. To this end, extensive information on the baseline behavior of normal mammary epithelium and breast cancer oncogenesis was integrated into a computational model termed the Ductal Epithelium Agent-Based Model (DEABM). The DEABM is composed of computational agents that behave according to rules established from published cellular and molecular mechanisms concerning breast duct epithelial dynamics and oncogenesis. The DEABM implements DNA damage and repair, cell division, genetic inheritance and simulates the local tissue environment with hormone excretion and receptor signaling. Unrepaired DNA damage impacts the integrity of the genome within individual cells, including a set of eight representative oncogenes and tumor suppressors previously implicated in breast cancer, with subsequent consequences on successive generations of cells. The DEABM reproduced cellular population dynamics seen during the menstrual cycle and pregnancy, and demonstrated the oncogenic effect of known genetic factors associated with breast cancer, namely TP53 and Myc, in simulations spanning ∼40 years of simulated time. Simulations comparing normal to BRCA1-mutant breast tissue demonstrated rates of invasive cancer development similar to published epidemiologic data with respect to both cumulative incidence over time and estrogen-receptor status. Investigation of the modeling of ERα-positive (ER+) tumorigenesis led to a novel hypothesis implicating the transcription factor and tumor suppressor RUNX3. These data suggest that the DEABM can serve as a potentially valuable framework to augment the traditional investigatory workflow for future hypothesis generation and testing of the mechanisms of breast cancer oncogenesis.
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Affiliation(s)
- Joaquin Chapa
- Pritzker School of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Ryan J. Bourgo
- Ben May Department of Cancer Research, University of Chicago, Chicago, Illinois, United States of America
| | - Geoffrey L. Greene
- Ben May Department of Cancer Research, University of Chicago, Chicago, Illinois, United States of America
| | - Swati Kulkarni
- Department of Surgery, University of Chicago, Chicago, Illinois, United States of America
| | - Gary An
- Department of Surgery, University of Chicago, Chicago, Illinois, United States of America
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Cerne JZ, Zong L, Jelinek J, Hilsenbeck SG, Wang T, Oesterreich S, McGuire SE. BRCA1 promoter methylation status does not predict response to tamoxifen in sporadic breast cancer patients. Breast Cancer Res Treat 2012; 135:135-43. [PMID: 22706629 DOI: 10.1007/s10549-012-2117-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Accepted: 05/26/2012] [Indexed: 12/30/2022]
Abstract
The purpose of this study is to investigate whether BRCA1 promoter methylation is associated with poorer outcome in sporadic breast cancer cases treated with tamoxifen. BRCA1 promoter methylation was determined by bisulfite pyrosequencing in two groups of sporadic breast cancer patients, systemically untreated (N = 497) and treated with adjuvant tamoxifen (N = 497). Associations of BRCA1 promoter methylation with clinopathological characteristics and the effect of BRCA1 promoter methylation on time to first recurrence (TTR) and overall survival (OS) were examined. No significant differences were observed between BRCA1 promoter methylation and clinopathological characteristics in untreated and tamoxifen-treated groups. Cut point analysis did not find any promising cut point for BRCA1 promoter methylation that would differentially influence TTR and OS in untreated and tamoxifen-treated group. Using the median (2.53 %) and an arbitrary value of 10 % as a cut point for methylation, we still found no significant effect of BRCA1 promoter methylation on TTR and OS in untreated and tamoxifen-treated group. Despite data suggesting that BRCA1 levels impact estrogen receptor response to tamoxifen, our results indicate that BRCA1 promoter methylation is not associated with poorer outcome in sporadic breast cancer cases treated with tamoxifen.
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Affiliation(s)
- Jasmina Z Cerne
- Department of Molecular & Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
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Natrajan R, Mackay A, Lambros MB, Weigelt B, Wilkerson PM, Manie E, Grigoriadis A, A’Hern R, van der Groep P, Kozarewa I, Popova T, Mariani O, Turaljic S, Furney SJ, Marais R, Rodruigues DN, Flora AC, Wai P, Pawar V, McDade S, Carroll J, Stoppa-Lyonnet D, Green AR, Ellis IO, Swanton C, van Diest P, Delattre O, Lord CJ, Foulkes WD, Vincent-Salomon A, Ashworth A, Stern MH, Reis-Filho JS. A whole-genome massively parallel sequencing analysis of BRCA1 mutant oestrogen receptor-negative and -positive breast cancers. J Pathol 2012; 227:29-41. [PMID: 22362584 PMCID: PMC4976800 DOI: 10.1002/path.4003] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 01/29/2012] [Accepted: 01/31/2012] [Indexed: 12/12/2022]
Abstract
BRCA1 encodes a tumour suppressor protein that plays pivotal roles in homologous recombination (HR) DNA repair, cell-cycle checkpoints, and transcriptional regulation. BRCA1 germline mutations confer a high risk of early-onset breast and ovarian cancer. In more than 80% of cases, tumours arising in BRCA1 germline mutation carriers are oestrogen receptor (ER)-negative; however, up to 15% are ER-positive. It has been suggested that BRCA1 ER-positive breast cancers constitute sporadic cancers arising in the context of a BRCA1 germline mutation rather than being causally related to BRCA1 loss-of-function. Whole-genome massively parallel sequencing of ER-positive and ER-negative BRCA1 breast cancers, and their respective germline DNAs, was used to characterize the genetic landscape of BRCA1 cancers at base-pair resolution. Only BRCA1 germline mutations, somatic loss of the wild-type allele, and TP53 somatic mutations were recurrently found in the index cases. BRCA1 breast cancers displayed a mutational signature consistent with that caused by lack of HR DNA repair in both ER-positive and ER-negative cases. Sequencing analysis of independent cohorts of hereditary BRCA1 and sporadic non-BRCA1 breast cancers for the presence of recurrent pathogenic mutations and/or homozygous deletions found in the index cases revealed that DAPK3, TMEM135, KIAA1797, PDE4D, and GATA4 are potential additional drivers of breast cancers. This study demonstrates that BRCA1 pathogenic germline mutations coupled with somatic loss of the wild-type allele are not sufficient for hereditary breast cancers to display an ER-negative phenotype, and has led to the identification of three potential novel breast cancer genes (ie DAPK3, TMEM135, and GATA4).
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Affiliation(s)
- Rachael Natrajan
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Alan Mackay
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Maryou B Lambros
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Britta Weigelt
- Signal Transduction Laboratory, Cancer Research UK London Research
Institute, WC2A 3LY, UK
| | - Paul M Wilkerson
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Elodie Manie
- Institut Curie, INSERM U830, 75248 Paris, France
| | - Anita Grigoriadis
- Breakthrough Research Unit, Bermondsey Wing, Guy’s Hospital,
London, SE1 9RT, UK
| | - Roger A’Hern
- CRUK Clinical Trials Unit, The Institute of Cancer Research, Sutton,
SM2 5NG, UK
| | | | - Iwanka Kozarewa
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | | | - Odette Mariani
- Institut Curie, Department of Tumour Biology, 75248 Paris,
France
| | - Samra Turaljic
- Signal Transduction Team, Division of Cell and Molecular Biology,
The Institute of Cancer Research, London, SW3 6JB, UK
| | - Simon J Furney
- Signal Transduction Team, Division of Cell and Molecular Biology,
The Institute of Cancer Research, London, SW3 6JB, UK
| | - Richard Marais
- Signal Transduction Team, Division of Cell and Molecular Biology,
The Institute of Cancer Research, London, SW3 6JB, UK
| | - Daniel-Nava Rodruigues
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Adriana C Flora
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Patty Wai
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Vidya Pawar
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Simon McDade
- Centre for Cancer Research and Cell Biology, Queen’s
University, Belfast, BT9 7BL, Northern Ireland, UK
| | - Jason Carroll
- Nuclear Receptor Transcription Laboratory, Cancer Research UK
Cambridge Research Institute, Cambridge, CB2 0RE, UK
| | - Dominique Stoppa-Lyonnet
- Institut Curie, INSERM U830, 75248 Paris, France
- Institut Curie, Department of Tumour Biology, 75248 Paris,
France
| | - Andrew R Green
- Department of Histopathology, School of Molecular Medical Sciences,
University of Nottingham and Nottingham University Hospitals Trust, Nottingham, NG7
2UH, UK
| | - Ian O Ellis
- Department of Histopathology, School of Molecular Medical Sciences,
University of Nottingham and Nottingham University Hospitals Trust, Nottingham, NG7
2UH, UK
| | - Charles Swanton
- Translational Cancer Therapeutics Laboratory, Cancer Research UK
London Research Institute, WC2A 3LY, UK
- UCL Cancer Institute, Huntley Street, London WC1E 6DD, UK
| | - Paul van Diest
- University Medical Centre Utrecht, 3584 CX Utrecht, The
Netherlands
| | | | - Christopher J Lord
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - William D Foulkes
- Program in Cancer Genetics, Departments of Human Genetics and
Oncology, McGill University, Montreal, QC, H2W 1S6, Canada
| | - Anne Vincent-Salomon
- Institut Curie, INSERM U830, 75248 Paris, France
- Institut Curie, Department of Tumour Biology, 75248 Paris,
France
| | - Alan Ashworth
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
| | - Marc Henri Stern
- Institut Curie, INSERM U830, 75248 Paris, France
- Institut Curie, Department of Tumour Biology, 75248 Paris,
France
| | - Jorge S Reis-Filho
- The Breakthrough Breast Cancer Research Centre, The Institute of
Cancer Research, London, SW3 6JB, UK
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Valentin MD, da Silva SD, Privat M, Alaoui-Jamali M, Bignon YJ. Molecular insights on basal-like breast cancer. Breast Cancer Res Treat 2012; 134:21-30. [PMID: 22234518 DOI: 10.1007/s10549-011-1934-z] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 12/17/2011] [Indexed: 12/28/2022]
Abstract
Molecular classification of breast cancer (BC) identified diverse subgroups that encompass distinct biological behavior and clinical implications, in particular in relation to prognosis, spread, and incidence of recurrence. Basal-like breast cancers (BLBC) compose up to 15% of BC and are characterized by lack of estrogen receptor (ER), progesterone receptor (PR), and HER-2 amplification with expression of basal cytokeratins 5/6, 14, 17, epidermal growth factor receptor (EGFR), and/or c-KIT. There is an overlap in definition between triple-negative BC and BLBC due to the triple-negative profile of BLBC. Also, most BRCA1-associated BCs are BLBC, triple negative, and express basal cytokeratins (5/6, 14, 17) and EGFR. There is a link between sporadic BLBC (occurring in women without germline BRCA1 mutations) with dysfunction of the BRCA1 pathway. Despite the molecular and clinical similarities, these subtypes respond differently to neoadjuvant therapy. BLBCs are associated with an aggressive phenotype, high histological grade, poor clinical behavior, and high rates of recurrences and/or metastasis. Their molecular features render these tumors especially refractory to anti-hormonal-based therapies and the overall prognosis of this subset remains poor. In this article, the molecular profile, genomic, and epigenetic characteristics as well as BRCA1 pathway dysfunction, clinicopathological behavior, and therapeutic options in BLBC are presented, with emphasis on the discordant findings in current literature.
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Affiliation(s)
- Mev Dominguez Valentin
- Department of Oncology, Lund University, BMC C.13, Klinikgatan 28, 221 84, Lund, Sweden.
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BRACking news on triple-negative/basal-like breast cancers: how BRCA1 deficiency may result in the development of a selective tumor subtype. Cancer Metastasis Rev 2011; 31:131-42. [DOI: 10.1007/s10555-011-9336-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Pang D, Zhao Y, Xue W, Shan M, Chen Y, Zhang Y, Zhang G, Liu F, Li D, Yang Y. Methylation profiles of the BRCA1 promoter in hereditary and sporadic breast cancer among Han Chinese. Med Oncol 2011; 29:1561-8. [PMID: 22076508 DOI: 10.1007/s12032-011-0100-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2011] [Accepted: 10/25/2011] [Indexed: 01/18/2023]
Abstract
The development of breast cancer is a multistep process associated with complex changes in host gene expression patterns including inactivation of tumor suppressor genes and activation of oncogenes. Critically, hereditary predisposition plays a significant role in cancer susceptibility. However, mutation of the BRCA1 gene is found only in the minority of hereditary breast cancer, which indicates that there might be alternative, novel mechanisms contributing to inactivation of the BRCA1 gene. Studies have shown that aberrant methylation of genomic DNA plays an important role in carcinogenesis. The aim of this study was to investigate whether DNA methylation may be an alternative mechanism for the inactivation of BRCA1 as an epigenetic modification of the genome and whether hereditary breast cancer has a different BRCA1 methylation phenotype pattern than sporadic breast cancer. The pattern of CpG island methylation within the promoter region of BRCA1 was assessed by bisulfite sequencing DNA from peripheral blood cells of 72 patients with hereditary predisposition but without BRCA1 mutations and 30 sporadic breast cancer controls. The overall methylation level in patients with hereditary predisposition was significantly lower than that in the sporadic control group. However, patients with hereditary predisposition showed a significantly higher methylation susceptibility for the sites -518 when compared to controls. These results suggest that there might be different BRCA1 promoter methylation levels and patterns in sporadic and hereditary breast cancer in peripheral blood DNA. These findings may facilitate the early diagnosis of hereditary breast cancer.
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Affiliation(s)
- Da Pang
- Department of Breast Surgery, The Third Affiliated Hospital of Harbin Medical University, HaPing Road 158, Harbin, China.
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La Rosa P, Acconcia F. Signaling functions of ubiquitin in the 17β-estradiol (E2):estrogen receptor (ER) α network. J Steroid Biochem Mol Biol 2011; 127:223-30. [PMID: 21824518 DOI: 10.1016/j.jsbmb.2011.07.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 07/23/2011] [Accepted: 07/26/2011] [Indexed: 02/07/2023]
Abstract
Protein posttranslational modifications (PTMs) are signaling alterations that allow coordinating the cellular responses with the changes in the extracellular environment. In this way, the posttranslationally-modified protein becomes a switch node in the transduction network activated by the specific extracellular stimuli. It is now clear that this is the case also for protein ubiquitination: this extremely versatile PTM controls cell physiology through the modulation of protein stability as well as through the modulation of the dynamics of the intracellular signaling cascades. Recent evidence clearly indicates that such a complex scheme appears to be valid also for the 17β-estradiol (E2):estrogen receptor (ER) α signal transduction pathways. Indeed, beside the long standing notion that ERα ubiquitination is required for the regulation of receptor stability, several laboratories, including our own, have clearly indicated that ERα ubiquitination also serves non-degradative functions. This review will reconsider the role of ubiquitination in E2:ERα signaling by particularly highlighting how the functions of the non-degradative ubiquitination impact on ERα activities and contribute to the modulation of E2-dependent physiological processes.
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Affiliation(s)
- Piergiorgio La Rosa
- Department of Biology, University Roma Tre, Viale Guglielmo Marconi, 446, I-00146 Rome, Italy
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Furth PA, Cabrera MC, Díaz-Cruz ES, Millman S, Nakles RE. Assessing estrogen signaling aberrations in breast cancer risk using genetically engineered mouse models. Ann N Y Acad Sci 2011; 1229:147-55. [PMID: 21793850 DOI: 10.1111/j.1749-6632.2011.06086.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Aberrations in estrogen signaling increase breast cancer risk. Molecular mechanisms that impact breast cancer initiation, promotion, and progression can be investigated using genetically engineered mouse models. Increasing estrogen receptor alpha (ERα) expression levels twofold is sufficient to initiate and promote breast cancer progression. Initiation and promotion can be increased by p53 haploinsufficiency and by coexpressing the nuclear coactivators amplified in breast cancer 1 (AIB1) or the splice variant AIB1Δ3. Progression to invasive cancer is found with coexpression of these nuclear coactivators as well as following a single dose of 7,12-dimethylbenz(a)anthracene. Loss of signal transducer and activator of transcription 5a reduces the prevalence of initiation and promotion but does not protect from invasive cancer development. Cyclin D1 loss completely interrupts mammary epithelial proliferation and survival when ERα is overexpressed. Loss of breast cancer gene 1 increases estrogen signaling and cooperates with ERα overexpression in initiation, promotion, and progression of mammary cancer.
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Affiliation(s)
- Priscilla A Furth
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA.
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Grillo J, DelloRusso C, Lynch RC, Folkman J, Zaslavsky A. Regulation of the angiogenesis inhibitor thrombospondin-1 by the breast cancer susceptibility gene-1 (BRCA1). Breast J 2011; 17:434-5. [PMID: 21679271 DOI: 10.1111/j.1524-4741.2011.01109.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Di LJ, Fernandez AG, De Siervi A, Longo DL, Gardner K. Transcriptional regulation of BRCA1 expression by a metabolic switch. Nat Struct Mol Biol 2010; 17:1406-13. [PMID: 21102443 PMCID: PMC3460552 DOI: 10.1038/nsmb.1941] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Accepted: 09/16/2010] [Indexed: 12/29/2022]
Abstract
Though the linkages between germline mutations of BRCA1 and hereditary breast cancer are well known, recent evidence suggests that altered BRCA1 transcription may also contribute to sporadic forms of breast cancer. Here we show that BRCA1 expression is controlled by a dynamic equilibrium between transcriptional coactivators and co-repressors that govern histone acetylation and DNA accessibility at the BRCA1 promoter. Eviction of the transcriptional co-repressor and metabolic sensor, C terminal-binding protein (CtBP), has a central role in this regulation. Loss of CtBP from the BRCA1 promoter through estrogen induction, depletion by RNA interference or increased NAD+/NADH ratio leads to HDAC1 dismissal, elevated histone acetylation and increased BRCA1 transcription. The active control of chromatin marks, DNA accessibility and gene expression at the BRCA1 promoter by this 'metabolic switch' provides an important molecular link between caloric intake and tumor suppressor expression in mammary cells.
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Affiliation(s)
- Li-Jun Di
- Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, Bethesda, Maryland, USA
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Tung N, Miron A, Schnitt SJ, Gautam S, Fetten K, Kaplan J, Yassin Y, Buraimoh A, Kim JY, Szász AM, Tian R, Wang ZC, Collins LC, Brock J, Krag K, Legare RD, Sgroi D, Ryan PD, Silver DP, Garber JE, Richardson AL. Prevalence and predictors of loss of wild type BRCA1 in estrogen receptor positive and negative BRCA1-associated breast cancers. Breast Cancer Res 2010; 12:R95. [PMID: 21080930 PMCID: PMC3046438 DOI: 10.1186/bcr2776] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2010] [Revised: 10/26/2010] [Accepted: 11/16/2010] [Indexed: 11/16/2022] Open
Abstract
Introduction The majority of breast cancers that occur in BRCA1 mutation carriers (BRCA1 carriers) are estrogen receptor-negative (ER-). Therefore, it has been suggested that ER negativity is intrinsic to BRCA1 cancers and reflects the cell of origin of these tumors. However, approximately 20% of breast cancers that develop in BRCA1 carriers are ER-positive (ER+); these cancers are more likely to develop as BRCA1 carriers age, suggesting that they may be incidental and unrelated to BRCA1 deficiency. The purpose of this study was to compare the prevalence of loss of heterozygosity due to loss of wild type (wt) BRCA1 in ER+ and ER- breast cancers that have occurred in BRCA1 carriers and to determine whether age at diagnosis or any pathologic features or biomarkers predict for loss of wt BRCA1 in these breast cancers. Methods Relative amounts of mutated and wt BRCA1 DNA were measured by quantitative polymerase chain reaction performed on laser capture microdissected cancer cells from 42 ER+ and 35 ER- invasive breast cancers that developed in BRCA1 carriers. BRCA1 gene methylation was determined on all cancers in which sufficient DNA was available. Immunostains for cytokeratins (CK) 5/6, 14, 8 and 18, epidermal growth factor receptor and p53 were performed on paraffin sections from tissue microarrays containing these cancers. Results Loss of wt BRCA1 was equally frequent in ER+ and ER- BRCA1-associated cancers (81.0% vs 88.6%, respectively; P = 0.53). One of nine cancers tested that retained wt BRCA1 demonstrated BRCA1 gene methylation. Age at diagnosis was not significantly different between first invasive ER+ BRCA1 breast cancers with and without loss of wt BRCA1 (mean age 45.2 years vs 50.1 years, respectively; P = 0.51). ER+ BRCA1 cancers that retained wt BRCA1 were significantly more likely than those that lost wt BRCA1 to have a low mitotic rate (odds ratio (OR), 5.16; 95% CI, 1.91 to ∞). BRCA1 cancers with loss of wt BRCA1 were more likely to express basal cytokeratins CK 5/6 or 14 (OR 4.7; 95% CI, 1.85 to ∞). Conclusions We found no difference in the prevalence of loss of wt BRCA1 between ER+ and ER- invasive BRCA1-associated breast cancers. Our findings suggest that many of the newer therapies for BRCA1 breast cancers designed to exploit the BRCA1 deficiency in these cancers may also be effective in ER+ cancers that develop in this population.
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Affiliation(s)
- Nadine Tung
- Division of Hematology-Oncology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.
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Manders P, Pijpe A, Hooning MJ, Kluijt I, Vasen HFA, Hoogerbrugge N, van Asperen CJ, Meijers-Heijboer H, Ausems MGEM, van Os TA, Gomez-Garcia EB, Brohet RM, van Leeuwen FE, Rookus MA. Body weight and risk of breast cancer in BRCA1/2 mutation carriers. Breast Cancer Res Treat 2010; 126:193-202. [DOI: 10.1007/s10549-010-1120-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2010] [Accepted: 08/07/2010] [Indexed: 12/24/2022]
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Delaloge S, Rimareix F, Balleyguier C, Remenieras A, Varga A, Uzan C, Bourgier C, Caron O. La génétique constitutionnelle peut-elle impacter la prise en charge d’une femme atteinte de cancer du sein aujourd’hui ? ONCOLOGIE 2010. [DOI: 10.1007/s10269-010-1877-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Emons G. Sexualsteroide und ihre onkogene Potenz. GYNAKOLOGISCHE ENDOKRINOLOGIE 2010. [DOI: 10.1007/s10304-009-0333-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Irminger-Finger I. BARD1, a possible biomarker for breast and ovarian cancer. Gynecol Oncol 2009; 117:211-5. [PMID: 19959210 DOI: 10.1016/j.ygyno.2009.10.079] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Revised: 10/01/2009] [Accepted: 10/16/2009] [Indexed: 02/01/2023]
Abstract
Breast cancer is the leading cause of cancer death in women. Ovarian cancer, although less frequent, is detected very late, and survival is correlated to early detection. Therefore, better methods for early detection would help to increase the number of survivors. The incidence of young women diagnosed with breast cancer is increasing. These women and women who are at risk because of a family history of breast cancer would benefit from more accurate and less invasive screening methods than those in place today. A blood test based on BARD1, a protein that interacts with the breast cancer gene product BRCA1, is a promising candidate for fulfilling these conditions. The science behind BARD1 and its role in breast and ovarian cancer is explained in this article.
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Affiliation(s)
- Irmgard Irminger-Finger
- Molecular Gynecology and Obstetrics Laboratory, Department of Gynecology and Obstetrics, University Hospitals Geneva, HUG Bld de la Cluse 30CH-1211 Geneva, Switzerland.
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Cuesta R, Gupta M, Schneider RJ. The regulation of protein synthesis in cancer. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2009; 90:255-92. [PMID: 20374744 DOI: 10.1016/s1877-1173(09)90007-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Translational control of cancer is a multifaceted process, involving alterations in translation factor levels and activities that are unique to the different types of cancers and the different stages of disease. Translational alterations in cancer include adaptations of the tumor itself, of the tumor microenvironment, an integral component in disease, and adaptations that occur as cancer progresses from development to local disease and ultimately to metastatic disease. Adaptations include the overexpression and increased activity of specific translation factors, the physical or functional loss of translation regulatory components, increased production of ribosomes, selective mRNA translation, and alteration of signal transduction pathways to permit unfettered activation of protein synthesis. There is intense clinical interest to capitalize on the emerging new understanding of translational control in cancer by targeting specific components of the translation apparatus that are altered in disease for the development of specific cancer therapeutics. Clinical trial data are nascent but encouraging, suggesting that translational control constitutes an important new area for drug development in human cancer.
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Affiliation(s)
- Rafael Cuesta
- Department of Microbiology, New York University School of Medicine, New York, New York 10016, USA
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Yan M, Rayoo M, Takano EA, Thorne H, Fox SB. BRCA1 tumours correlate with a HIF-1alpha phenotype and have a poor prognosis through modulation of hydroxylase enzyme profile expression. Br J Cancer 2009; 101:1168-74. [PMID: 19724277 PMCID: PMC2768103 DOI: 10.1038/sj.bjc.6605287] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Background: There are limited data regarding the hypoxia pathway in familial breast cancers. We therefore performed a study of hypoxic factors in BRCA1, BRCA2 and BRCAX breast cancers. Methods: Immunoperoxidase staining for HIF-1α, PHD1, PHD2, PHD3, VEGF and FIH was carried out in 125 (38 BRCA1, 33 BRCA2 and 54 BRCAX) breast carcinomas. These were correlated with clinicopathological parameters and the intrinsic breast cancer phenotypes. Results: BRCA1 tumours correlated with positivity for HIF-1α (P=0.008) and negativity for PHD3 (P=0.037). HIF-1α positivity (P=0.001), PHD3 negativity (P=0.037) and nuclear FIH negativity (P=0.011) was associated with basal phenotype. HIF-1α expression correlated with high tumour grade (P=0.009), negative oestrogen receptor (ER) status (P=0.001) and the absence of lymph node metastasis (P=0.028). Nuclear FIH expression and PHD3 correlated with positive ER expression (P=0.024 and P=0.035, respectively). BRCA1 cancers with positive HIF-1α or cytoplasmic FIH had a significantly shorter relapse-free survival (P=0.007 and P=0.049, respectively). Conclusions: The aggressive nature of BRCA1 and basal-type tumours may be partly explained by an enhanced hypoxic drive and hypoxia driven ER degradation because of suppressed PHD and aberrantly located FIH expression. This may have important implications, as these tumours may respond to compounds directed against HIF-1α or its downstream targets.
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Affiliation(s)
- M Yan
- Department of Pathology, Peter MacCallum Cancer Centre, St Andrews Place, East Melbourne, Victoria 3002, Australia
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