1
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Kizilboga T, Özden C, Can ND, Onay Ucar E, Dinler Doganay G. Bag-1-mediated HSF1 phosphorylation regulates expression of heat shock proteins in breast cancer cells. FEBS Open Bio 2024. [PMID: 39049197 DOI: 10.1002/2211-5463.13843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 03/20/2024] [Accepted: 05/29/2024] [Indexed: 07/27/2024] Open
Abstract
According to the World Health Organization in 2022, 2.3 million women were diagnosed with breast cancer. Investigating the interaction networks between Bcl-2-associated athanogene (Bag)-1 and other chaperone proteins may further the current understanding of the regulation of protein homeostasis in breast cancer cells and contribute to the development of treatment options. The present study aimed to determine the interactions between Bag-1 and heat shock proteins (HSPs); namely, HSP90, HSP70 and HSP27, to elucidate their role in promoting heat shock factor-1 (HSF1)-dependent survival of breast cancer cells. HER2-negative (MCF-7) and HER2-positive (BT-474) cell lines were used to examine the impact of Bag-1 expression on HSF1 and HSPs. We demonstrated that Bag-1 overexpression promoted HER2 expression in breast cancer cells, thereby resulting in the concurrent constitutive activation of the HSF1-HSP axis. The activation of HSP results in the stabilization of several tumor-promoting HSP clients such as AKT, mTOR and HSF1 itself, which substantially accelerates tumor development. Our results suggest that Bag-1 can modulate the chaperone activity of HSPs, such as HSP27, by directly or indirectly regulating the phosphorylation of HSF1. This modulation of chaperone activity can influence the activation of genes involved in cellular homeostasis, thereby protecting cells against stress.
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Affiliation(s)
- Tugba Kizilboga
- Department of Molecular Biology and Genetics, Istanbul Technical University, Turkey
- Department of Molecular Biology and Genetics, Institute of Graduate Studies in Sciences, Istanbul University, Turkey
| | - Can Özden
- Department of Molecular Biology and Genetics, Istanbul Technical University, Turkey
| | - Nisan Denizce Can
- Department of Molecular Biology and Genetics, Istanbul Technical University, Turkey
| | - Evren Onay Ucar
- Department of Molecular Biology and Genetics, Faculty of Sciences, Istanbul University, Turkey
| | - Gizem Dinler Doganay
- Department of Molecular Biology and Genetics, Istanbul Technical University, Turkey
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2
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Neeb A, Figueiredo I, Bogdan D, Cato L, Stober J, Jiménez-Vacas JM, Gourain V, Lee II, Seeger R, Muhle-Goll C, Gurel B, Welti J, Nava Rodrigues D, Rekowski J, Qiu X, Jiang Y, Di Micco P, Mateos B, Bielskutė S, Riisnaes R, Ferreira A, Miranda S, Crespo M, Buroni L, Ning J, Carreira S, Bräse S, Jung N, Gräßle S, Swain A, Salvatella X, Plymate SR, Al-Lazikani B, Long HW, Yuan W, Brown M, Cato AC, de Bono JS, Sharp A. Thio-2 Inhibits Key Signaling Pathways Required for the Development and Progression of Castration-resistant Prostate Cancer. Mol Cancer Ther 2024; 23:791-808. [PMID: 38412481 PMCID: PMC11148553 DOI: 10.1158/1535-7163.mct-23-0354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 09/26/2023] [Accepted: 02/22/2024] [Indexed: 02/29/2024]
Abstract
Therapies that abrogate persistent androgen receptor (AR) signaling in castration-resistant prostate cancer (CRPC) remain an unmet clinical need. The N-terminal domain of the AR that drives transcriptional activity in CRPC remains a challenging therapeutic target. Herein we demonstrate that BCL-2-associated athanogene-1 (BAG-1) mRNA is highly expressed and associates with signaling pathways, including AR signaling, that are implicated in the development and progression of CRPC. In addition, interrogation of geometric and physiochemical properties of the BAG domain of BAG-1 isoforms identifies it to be a tractable but challenging drug target. Furthermore, through BAG-1 isoform mouse knockout studies, we confirm that BAG-1 isoforms regulate hormone physiology and that therapies targeting the BAG domain will be associated with limited "on-target" toxicity. Importantly, the postulated inhibitor of BAG-1 isoforms, Thio-2, suppressed AR signaling and other important pathways implicated in the development and progression of CRPC to reduce the growth of treatment-resistant prostate cancer cell lines and patient-derived models. However, the mechanism by which Thio-2 elicits the observed phenotype needs further elucidation as the genomic abrogation of BAG-1 isoforms was unable to recapitulate the Thio-2-mediated phenotype. Overall, these data support the interrogation of related compounds with improved drug-like properties as a novel therapeutic approach in CRPC, and further highlight the clinical potential of treatments that block persistent AR signaling which are currently undergoing clinical evaluation in CRPC.
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Affiliation(s)
- Antje Neeb
- Institute of Cancer Research, London, United Kingdom
| | | | - Denisa Bogdan
- Institute of Cancer Research, London, United Kingdom
| | - Laura Cato
- Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Jutta Stober
- Karlsruhe Institute of Technology (KIT), Institute for Biological and Chemical Systems – Biological Information Processing (IBCS-BIP), Eggenstein-Leopoldshafen, Germany
| | | | - Victor Gourain
- Karlsruhe Institute of Technology (KIT), Institute for Biological and Chemical Systems – Biological Information Processing (IBCS-BIP), Eggenstein-Leopoldshafen, Germany
| | - Irene I. Lee
- Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Rebecca Seeger
- Karlsruhe Institute of Technology (KIT), Institute for Biological and Chemical Systems – Biological Information Processing (IBCS-BIP), Eggenstein-Leopoldshafen, Germany
| | - Claudia Muhle-Goll
- Karlsruhe Institute of Technology (KIT), Institute for Biological Interfaces 4 (IBG-4), Eggenstein-Leopoldshafen, Germany
| | - Bora Gurel
- Institute of Cancer Research, London, United Kingdom
| | | | | | - Jan Rekowski
- Institute of Cancer Research, London, United Kingdom
| | - Xintao Qiu
- Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Yija Jiang
- Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Patrizio Di Micco
- Institute of Cancer Research, London, United Kingdom
- MD Anderson Cancer Centre, Houston, Texas
| | - Borja Mateos
- Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Stasė Bielskutė
- Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Ruth Riisnaes
- Institute of Cancer Research, London, United Kingdom
| | - Ana Ferreira
- Institute of Cancer Research, London, United Kingdom
| | | | - Mateus Crespo
- Institute of Cancer Research, London, United Kingdom
| | | | - Jian Ning
- Institute of Cancer Research, London, United Kingdom
| | | | - Stefan Bräse
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems – Functional Molecular Systems (IBCS-FMS), Eggenstein-Leopoldshafen, Germany
| | - Nicole Jung
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems – Functional Molecular Systems (IBCS-FMS), Eggenstein-Leopoldshafen, Germany
| | - Simone Gräßle
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems – Functional Molecular Systems (IBCS-FMS), Eggenstein-Leopoldshafen, Germany
| | - Amanda Swain
- Institute of Cancer Research, London, United Kingdom
| | - Xavier Salvatella
- Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain
- Catalan Institution for Research and Advanced Studies, Barcelona, Spain
| | - Stephen R. Plymate
- University of Washington, Seattle, Washington
- Geriatrics Research, Education and Clinical Center, VAPSHCS, Seattle, Washington
| | | | | | - Wei Yuan
- Institute of Cancer Research, London, United Kingdom
| | - Myles Brown
- Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Andrew C.B. Cato
- Karlsruhe Institute of Technology (KIT), Institute for Biological and Chemical Systems – Biological Information Processing (IBCS-BIP), Eggenstein-Leopoldshafen, Germany
| | - Johann S. de Bono
- Institute of Cancer Research, London, United Kingdom
- Royal Marsden NHS Foundation Trust, London, United Kingdom
| | - Adam Sharp
- Institute of Cancer Research, London, United Kingdom
- Royal Marsden NHS Foundation Trust, London, United Kingdom
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3
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Resistance to Trastuzumab. Cancers (Basel) 2022; 14:cancers14205115. [PMID: 36291900 PMCID: PMC9600208 DOI: 10.3390/cancers14205115] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/12/2022] [Accepted: 10/17/2022] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Trastuzumab is a humanized antibody that has significantly improved the management and treatment outcomes of patients with cancers that overexpress HER2. Many research groups, both in academia and industry, have contributed towards understanding the various mechanisms engaged by trastuzumab to mediate its anti-tumor effects. Nevertheless, data from several clinical studies have indicated that a significant proportion of patients exhibit primary or acquired resistance to trastuzumab therapy. In this article, we discuss underlying mechanisms that contribute towards to resistance. Furthermore, we discuss the potential strategies to overcome some of the mechanisms of resistance to enhance the therapeutic efficacy of trastuzumab and other therapies based on it. Abstract One of the most impactful biologics for the treatment of breast cancer is the humanized monoclonal antibody, trastuzumab, which specifically recognizes the HER2/neu (HER2) protein encoded by the ERBB2 gene. Useful for both advanced and early breast cancers, trastuzumab has multiple mechanisms of action. Classical mechanisms attributed to trastuzumab action include cell cycle arrest, induction of apoptosis, and antibody-dependent cell-mediated cytotoxicity (ADCC). Recent studies have identified the role of the adaptive immune system in the clinical actions of trastuzumab. Despite the multiple mechanisms of action, many patients demonstrate resistance, primary or adaptive. Newly identified molecular and cellular mechanisms of trastuzumab resistance include induction of immune suppression, vascular mimicry, generation of breast cancer stem cells, deregulation of long non-coding RNAs, and metabolic escape. These newly identified mechanisms of resistance are discussed in detail in this review, particularly considering how they may lead to the development of well-rationalized, patient-tailored combinations that improve patient survival.
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4
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Guo J, Du X, Li C. BAG family proteins contributes to autophagy-mediated multidrug resistance of tumor. Clin Transl Oncol 2022; 24:1492-1500. [PMID: 35278199 DOI: 10.1007/s12094-022-02819-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 02/22/2022] [Indexed: 12/13/2022]
Abstract
Multidrug resistance (MDR) is a significant cause of tumor treatment failure. Accumulating evidence suggests that autophagy plays a significant role in the development of MDR. Autophagy is a conserved mechanism that maintains tumor homeostasis by removing damaged mitochondria. However, the specific regulatory mechanism is unclear. Here, we summarize recent studies on the role of autophagy in the development of MDR and the initiation of mitophagy by Bcl-2-associated athanogene (BAG) family proteins. Additionally, this mini-review emphasizes the regulatory role of BAG family proteins, which maintain mitochondrial homeostasis by regulating the PINK1/Parkin pathway. Elucidation of the regulatory mechanisms of mitophagy may foster the development of clinical therapeutic strategies for MDR tumors.
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Affiliation(s)
- Jufang Guo
- Department of Obstetrics and Gynecology, Jinniu District Maternal and Child Health Hospital, Chengdu, China
| | - Xuelian Du
- Department of Obstetrics and Gynecology, Jinniu District Maternal and Child Health Hospital, Chengdu, China
| | - Chaolin Li
- Department of Obstetrics and Gynecology, Jinniu District Maternal and Child Health Hospital, Chengdu, China.
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5
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Mariotto E, Viola G, Zanon C, Aveic S. A BAG's life: Every connection matters in cancer. Pharmacol Ther 2020; 209:107498. [PMID: 32001313 DOI: 10.1016/j.pharmthera.2020.107498] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 01/17/2020] [Indexed: 12/30/2022]
Abstract
The members of the BCL-2 associated athanogene (BAG) family participate in the regulation of a variety of interrelated physiological processes, such as autophagy, apoptosis, and protein homeostasis. Under normal circumstances, the six BAG members described in mammals (BAG1-6) principally assist the 70 kDa heat-shock protein (HSP70) in protein folding; however, their role as oncogenes is becoming increasingly evident. Deregulation of the BAG multigene family has been associated with cell transformation, tumor recurrence, and drug resistance. In addition to BAG overexpression, BAG members are also involved in many oncogenic protein-protein interactions (PPIs). As such, either the inhibition of overloading BAGs or of specific BAG-client protein interactions could have paramount therapeutic value. In this review, we will examine the role of each BAG family member in different malignancies, focusing on their modular structure, which enables interaction with a variety of proteins to exert their pro-tumorigenic role. Lastly, critical remarks on the unmet needs for proposing effective BAG inhibitors will be pointed out.
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Affiliation(s)
- Elena Mariotto
- Department of Woman's and Child's Health, University of Padova, Via Giustiniani 2, 35127 Padova, Italy; Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti 4, 35128 Padova, Italy.
| | - Giampietro Viola
- Department of Woman's and Child's Health, University of Padova, Via Giustiniani 2, 35127 Padova, Italy; Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti 4, 35128 Padova, Italy
| | - Carlo Zanon
- Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti 4, 35128 Padova, Italy
| | - Sanja Aveic
- Neuroblastoma Laboratory, Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti 4, 35128 Padova, Italy
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6
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Song Y, Li Z, Wang Y, Qu Y, Li Q, Man X, Wang F, Hu D. Inhibition of BAG‐1 induced SH‐SY5Y cell apoptosis without affecting Hsp70 expression. J Cell Biochem 2019; 121:1728-1735. [PMID: 31609014 DOI: 10.1002/jcb.29408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Accepted: 08/28/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Yan‐Kun Song
- Department of Pediatric Emergency The Affiliated Hospital of Qingdao University Qingdao Shandong China
| | - Zhi Li
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Yun Wang
- Department of Pediatric Emergency The Affiliated Hospital of Qingdao University Qingdao Shandong China
| | - Yan Qu
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Qing‐Shu Li
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Xiao‐Yun Man
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
| | - Feng‐Tao Wang
- Department of Pediatric Emergency The Affiliated Hospital of Qingdao University Qingdao Shandong China
| | - Dan Hu
- Department of Intensive Care Unit Qingdao Municipal Hospital Affiliated to Qingdao University Qingdao Shandong China
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7
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Kilbas PO, Akcay IM, Doganay GD, Arisan ED. Bag-1 silencing enhanced chemotherapeutic drug-induced apoptosis in MCF-7 breast cancer cells affecting PI3K/Akt/mTOR and MAPK signaling pathways. Mol Biol Rep 2019; 46:847-860. [PMID: 30661182 DOI: 10.1007/s11033-018-4540-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 11/28/2018] [Indexed: 12/21/2022]
Abstract
The multifunctional anti-apoptotic Bag-1 protein has important roles in apoptosis, proteasome-mediated degradation, transcriptional regulation, and intracellular signaling. Bag-1 promotes cell survival and proliferation, and is overexpressed in breast cancer. Therefore, Bag-1-targeted therapy might be a promising strategy to treat breast cancer. However, the effects of Bag-1 silencing in combination with conventional chemotherapeutic drugs on cell viability and major signaling pathways have not yet been fully investigated in breast cancer cells. In this study, we investigated the cytotoxic effects of Bag-1 silencing, alone and in combination with cisplatin or paclitaxel treatment, in MCF-7 breast cancer cells. Bag-1 knockdown by shRNA or siRNA transfection sensitized MCF-7 cells to apoptosis induced by cisplatin or paclitaxel. Combination of Bag-1 silencing and drug treatment more potently downregulated the pro-survival PI3K/Akt/mTOR and p44/42 mitogen activated protein kinase (MAPK) pathways, and more potently upregulated the stress-activated p38 and SAPK/JNK MAPK pathways. Bag-1-silenced drug-treated cells had also highly reduced proliferative capacity, downregulated cyclin-cyclin dependent kinase complexes and upregulated tumor suppressors p21 and Rb. These results overall indicated that Bag-1 silencing enhanced cisplatin- or paclitaxel-induced cytotoxicity through multiple pathways. In conclusion, Bag-1 targeted therapy might enhance the therapeutic potential of conventional anti-cancer drugs in the treatment of breast cancer.
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Affiliation(s)
- Pelin Ozfiliz Kilbas
- Department of Molecular Biology-Genetics and Biotechnology, Istanbul Technical University, Istanbul, Turkey.,Department of Molecular Biology and Genetics, Istanbul Kultur University, Istanbul, Turkey
| | - Izzet Mehmet Akcay
- Department of Molecular Biology-Genetics and Biotechnology, Istanbul Technical University, Istanbul, Turkey
| | - Gizem Dinler Doganay
- Department of Molecular Biology-Genetics and Biotechnology, Istanbul Technical University, Istanbul, Turkey.
| | - Elif Damla Arisan
- Department of Molecular Biology and Genetics, Istanbul Kultur University, Istanbul, Turkey.
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8
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Sauerbrei W, Haeussler T. Comment on 'BAG-1 as a biomarker in early breast cancer prognosis: a systematic review with meta-analyses'. Br J Cancer 2018. [PMID: 29540774 PMCID: PMC5931108 DOI: 10.1038/s41416-018-0023-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Affiliation(s)
- Willi Sauerbrei
- Institute for Medical Biometry and Statistics, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany.
| | - Tim Haeussler
- Institute for Medical Biometry and Statistics, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
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9
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Zeng F, Fu J, Hu F, Tang Y, Fang X, Zeng F, Chu Y. Identification of key pathways and genes in response to trastuzumab treatment in breast cancer using bioinformatics analysis. Oncotarget 2018; 9:32149-32160. [PMID: 30181805 PMCID: PMC6114942 DOI: 10.18632/oncotarget.24605] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 02/25/2018] [Indexed: 01/06/2023] Open
Abstract
Breast cancer (BC) is one of the leading causes of death among women worldwide. The gene expression profile GSE22358 was downloaded from the Gene Expression Omnibus (GEO) database, which included 154 operable early-stage breast cancer samples treated with neoadjuvant capecitabine plus docetaxel, with (34) or without trastuzumab (120), to identify gene signatures during trastuzumab treatment and uncover their potential mechanisms. The gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes pathway (KEGG) enrichment analyses were performed, and a protein–protein interaction (PPI) network of the differentially expressed genes (DEGs) was constructed by Cytoscape software. There were 2284 DEGs, including 1231 up-regulated genes enriched in DNA replication, protein N-linked glycosylation via asparagine, and response to toxic substances, while 1053 down-regulated genes were enriched in axon guidance, protein localization to plasma membrane, protein stabilization, and protein glycosylation. Eight hub genes were identified from the PPI network, including GSK3B, RAC1, PXN, ERBB2, HSP90AA1, FGF2, PIK3R1 and RAC2. Our experimental results showed that GSK3B was also highly expressed in breast cancer tissues and was associated with poor survival, as was β-catenin. In conclusion, the present study indicated that the identified DEGs and hub genes further our understanding of the molecular mechanisms underlying trastuzumab treatment in BC and highlighted GSK3B, which might be used as a molecular target for the treatment of BC.
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Affiliation(s)
- Fanxin Zeng
- Institute of Molecular Medicine, Peking University, Beijing, China.,Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China.,Department of Oncology, Dazhou Central Hospital, Dazhou, Sichuan, China
| | - Jiangping Fu
- Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China.,Department of Oncology, Dazhou Central Hospital, Dazhou, Sichuan, China
| | - Fang Hu
- Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China.,Department of Oncology, Dazhou Central Hospital, Dazhou, Sichuan, China
| | - Yani Tang
- Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China
| | - Xiangdong Fang
- Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China.,Department of Oncology, Dazhou Central Hospital, Dazhou, Sichuan, China
| | - Fanwei Zeng
- Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China
| | - Yanpeng Chu
- Dazhou Central Hospital Clinic Medical Center, Dazhou, Sichuan, China
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10
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Papadakis ES, Reeves T, Robson NH, Maishman T, Packham G, Cutress RI. BAG-1 as a biomarker in early breast cancer prognosis: a systematic review with meta-analyses. Br J Cancer 2017; 116:1585-1594. [PMID: 28510570 PMCID: PMC5518859 DOI: 10.1038/bjc.2017.130] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 04/12/2017] [Accepted: 04/12/2017] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND The co-chaperone protein Bcl-2-associated athanogene-1 (BAG-1) is overexpressed in breast cancer and has been incorporated in the oncotype DX and PAM50 breast cancer prognostic assays. Bcl-2-associated athanogene-1 exists as multiple protein isoforms that interact with diverse partners, including chaperones Hsc70/Hsp70, Ser/Thr kinase Raf-1 and Bcl-2, to promote cancer cell survival. The BAG-1L isoform specifically binds to and increases the transcriptional activity of oestrogen receptor in cells, and in some, but not all studies, BAG-1 expression is predictive of clinical outcome in breast cancer. METHODS A systematic review of published studies reporting BAG-1 (mRNA and/or protein) expression and clinical outcome in early breast cancer. The REporting Recommendations for Tumour MARKer and Prognostic Studies (REMARK) criteria were used as a template against which data were assessed. Meta-analyses were performed for studies that provided a hazard ratio and 95% confidence intervals for clinical outcomes including disease-free survival or breast cancer-specific survival from univariate analysis. RESULTS Eighteen studies used differing methodologies and reported on differing outcomes. Meta-analyses were only possible on results from a subset of reported studies. Meta-analyses suggested improved outcome with high BAG-1 mRNA and high BAG-1 nuclear expression by immunohistochemisty. CONCLUSIONS Increased levels of BAG-1 are associated with better breast cancer outcomes.
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Affiliation(s)
- E S Papadakis
- Cancer Research UK Centre Cancer Sciences Unit, University of Southampton Faculty of Medicine, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - T Reeves
- Cancer Research UK Centre Cancer Sciences Unit, University of Southampton Faculty of Medicine, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - N H Robson
- Cancer Research UK Centre Cancer Sciences Unit, University of Southampton Faculty of Medicine, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - T Maishman
- Southampton Clinical Trials Unit, University of Southampton, Southampton SO17 1BJ, UK
| | - G Packham
- Cancer Research UK Centre Cancer Sciences Unit, University of Southampton Faculty of Medicine, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - R I Cutress
- Cancer Research UK Centre Cancer Sciences Unit, University of Southampton Faculty of Medicine, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
- University Hospital Southampton, University of Southampton Faculty of Medicine, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
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