1
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Sha G, Jiang Z, Zhang W, Jiang C, Wang D, Tang D. The multifunction of HSP70 in cancer: Guardian or traitor to the survival of tumor cells and the next potential therapeutic target. Int Immunopharmacol 2023; 122:110492. [PMID: 37390645 DOI: 10.1016/j.intimp.2023.110492] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/22/2023] [Accepted: 06/09/2023] [Indexed: 07/02/2023]
Abstract
Heat shock protein 70 (HSP70) is a highly conserved protein composed of nucleotide-binding domains (NBD) and C-terminal substrate binding domain (SBD) that can function as a "molecular chaperone". HSP70 was discovered to directly or indirectly play a regulatory role in both internal and external apoptosis pathways. Studies have shown that HSP70 can not only promote tumor progression, enhance tumor cell resistance and inhibit anticancer effects but also induce an anticancer response by activating immune cells. In addition, chemotherapy, radiotherapy and immunotherapy for cancer may be affected by HSP70, which has shown promising potential as an anticancer drug. In this review, we summarized the molecular structure and mechanism of HSP70 and discussed the dual effects of HSP70 on tumor cells and the possibility and potential methods of using HSP70 as a target to treat cancer.
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Affiliation(s)
- Gengyu Sha
- Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu Province 225000, China.
| | - Zhengting Jiang
- Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu Province 225000, China.
| | - Wenjie Zhang
- Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu Province 225000, China.
| | - Chuwen Jiang
- Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu Province 225000, China.
| | - Daorong Wang
- Department of General Surgery, Institute of General Surgery, Clinical Medical College, Yangzhou University, Northern Jiangsu People's Hospital, Yangzhou 225000, China.
| | - Dong Tang
- Department of General Surgery, Institute of General Surgery, Clinical Medical College, Yangzhou University, Northern Jiangsu People's Hospital, Yangzhou 225000, China.
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2
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Orfanoudaki M, Smith EA, Hill NT, Garman KA, Brownell I, Copp BR, Grkovic T, Henrich CJ. An Investigation of Structure-Activity Relationships and Cell Death Mechanisms of the Marine Alkaloids Discorhabdins in Merkel Cell Carcinoma Cells. Mar Drugs 2023; 21:474. [PMID: 37755087 PMCID: PMC10532587 DOI: 10.3390/md21090474] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 08/23/2023] [Accepted: 08/25/2023] [Indexed: 09/28/2023] Open
Abstract
A library of naturally occurring and semi-synthetic discorhabdins was assessed for their effects on Merkel cell carcinoma (MCC) cell viability. The set included five new natural products and semi-synthetic compounds whose structures were elucidated with NMR, HRMS, and ECD techniques. Several discorhabdins averaged sub-micromolar potency against the MCC cell lines tested and most of the active compounds showed selectivity towards virus-positive MCC cell lines. An investigation of structure-activity relationships resulted in an expanded understanding of the crucial structural features of the discorhabdin scaffold. Mechanistic cell death assays suggested that discorhabdins, unlike many other MCC-active small molecules, do not induce apoptosis, as shown by the lack of caspase activation, annexin V staining, and response to caspase inhibition. Similarly, discorhabdin treatment failed to increase MCC intracellular calcium and ROS levels. In contrast, the rapid loss of cellular reducing potential and mitochondrial membrane potential suggested that discorhabdins induce mitochondrial dysfunction leading to non-apoptotic cell death.
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Affiliation(s)
- Maria Orfanoudaki
- Molecular Targets Program, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA; (M.O.); (E.A.S.)
| | - Emily A. Smith
- Molecular Targets Program, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA; (M.O.); (E.A.S.)
- Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Natasha T. Hill
- Dermatology Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20891, USA; (N.T.H.); (K.A.G.); (I.B.)
| | - Khalid A. Garman
- Dermatology Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20891, USA; (N.T.H.); (K.A.G.); (I.B.)
| | - Isaac Brownell
- Dermatology Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20891, USA; (N.T.H.); (K.A.G.); (I.B.)
| | - Brent R. Copp
- School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand;
| | - Tanja Grkovic
- Molecular Targets Program, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA; (M.O.); (E.A.S.)
- Natural Products Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick, MD 21702, USA
| | - Curtis J. Henrich
- Molecular Targets Program, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA; (M.O.); (E.A.S.)
- Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
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3
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Houben R, Alimova P, Sarma B, Hesbacher S, Schulte C, Sarosi EM, Adam C, Kervarrec T, Schrama D. 4-[(5-Methyl-1H-pyrazol-3-yl)amino]-2H-phenyl-1-phthalazinone Inhibits MCPyV T Antigen Expression in Merkel Cell Carcinoma Independent of Aurora Kinase A. Cancers (Basel) 2023; 15:cancers15092542. [PMID: 37174007 PMCID: PMC10177447 DOI: 10.3390/cancers15092542] [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: 02/21/2023] [Revised: 04/26/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
Merkel cell carcinoma (MCC) is frequently caused by the Merkel cell polyomavirus (MCPyV), and MCPyV-positive tumor cells depend on expression of the virus-encoded T antigens (TA). Here, we identify 4-[(5-methyl-1H-pyrazol-3-yl)amino]-2H-phenyl-1-phthalazinone (PHT)-a reported inhibitor of Aurora kinase A-as a compound inhibiting growth of MCC cells by repressing noncoding control region (NCCR)-controlled TA transcription. Surprisingly, we find that TA repression is not caused by inhibition of Aurora kinase A. However, we demonstrate that β-catenin-a transcription factor repressed by active glycogen synthase kinase 3 (GSK3)-is activated by PHT, suggesting that PHT bears a hitherto unreported inhibitory activity against GSK3, a kinase known to function in promoting TA transcription. Indeed, applying an in vitro kinase assay, we demonstrate that PHT directly targets GSK3. Finally, we demonstrate that PHT exhibits in vivo antitumor activity in an MCC xenograft mouse model, suggesting a potential use in future therapeutic settings for MCC.
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Affiliation(s)
- Roland Houben
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Pamela Alimova
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Bhavishya Sarma
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Sonja Hesbacher
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Carolin Schulte
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Eva-Maria Sarosi
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Christian Adam
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
| | - Thibault Kervarrec
- Department of Pathology, Centre Hospitalier Universitaire de Tours, INRA UMR 1282 BIP, 37200 Tours, France
| | - David Schrama
- Department of Dermatology, Venereology und Allergology, University Hospital Würzburg, 97080 Würzburg, Germany
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4
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Zhao K, Zhou G, Liu Y, Zhang J, Chen Y, Liu L, Zhang G. HSP70 Family in Cancer: Signaling Mechanisms and Therapeutic Advances. Biomolecules 2023; 13:601. [PMID: 37189349 PMCID: PMC10136146 DOI: 10.3390/biom13040601] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/10/2023] [Accepted: 03/17/2023] [Indexed: 03/29/2023] Open
Abstract
The 70 kDa heat shock proteins (HSP70s) are a group of highly conserved and inducible heat shock proteins. One of the main functions of HSP70s is to act as molecular chaperones that are involved in a large variety of cellular protein folding and remodeling processes. HSP70s are found to be over-expressed and may serve as prognostic markers in many types of cancers. HSP70s are also involved in most of the molecular processes of cancer hallmarks as well as the growth and survival of cancer cells. In fact, many effects of HSP70s on cancer cells are not only related to their chaperone activities but rather to their roles in regulating cancer cell signaling. Therefore, a number of drugs directly or indirectly targeting HSP70s, and their co-chaperones have been developed aiming to treat cancer. In this review, we summarized HSP70-related cancer signaling pathways and corresponding key proteins regulated by the family of HSP70s. In addition, we also summarized various treatment approaches and progress of anti-tumor therapy based on targeting HSP70 family proteins.
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Affiliation(s)
- Kejia Zhao
- Department of Thoracic Surgery and Institute of Thoracic Oncology, West China Hospital, Sichuan University, Chengdu 610041, China
- Western China Collaborative Innovation Center for Early Diagnosis and Multidisciplinary Therapy of Lung Cancer, Chengdu 610041, China
| | - Guanyu Zhou
- Department of Thoracic Surgery and Institute of Thoracic Oncology, West China Hospital, Sichuan University, Chengdu 610041, China
- Western China Collaborative Innovation Center for Early Diagnosis and Multidisciplinary Therapy of Lung Cancer, Chengdu 610041, China
- Frontiers Science Center for Disease-related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yu Liu
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Hong Kong 999077, China
| | - Jian Zhang
- Department of Thoracic Surgery and Institute of Thoracic Oncology, West China Hospital, Sichuan University, Chengdu 610041, China
- Western China Collaborative Innovation Center for Early Diagnosis and Multidisciplinary Therapy of Lung Cancer, Chengdu 610041, China
| | - Yaohui Chen
- Department of Thoracic Surgery and Institute of Thoracic Oncology, West China Hospital, Sichuan University, Chengdu 610041, China
- Western China Collaborative Innovation Center for Early Diagnosis and Multidisciplinary Therapy of Lung Cancer, Chengdu 610041, China
| | - Lunxu Liu
- Department of Thoracic Surgery and Institute of Thoracic Oncology, West China Hospital, Sichuan University, Chengdu 610041, China
- Western China Collaborative Innovation Center for Early Diagnosis and Multidisciplinary Therapy of Lung Cancer, Chengdu 610041, China
| | - Gao Zhang
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Hong Kong 999077, China
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5
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Synthetic Small Molecule Modulators of Hsp70 and Hsp40 Chaperones as Promising Anticancer Agents. Int J Mol Sci 2023; 24:ijms24044083. [PMID: 36835501 PMCID: PMC9964478 DOI: 10.3390/ijms24044083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 02/09/2023] [Accepted: 02/11/2023] [Indexed: 02/22/2023] Open
Abstract
A class of chaperones dubbed heat shock protein 70 (Hsp70) possesses high relevance in cancer diseases due to its cooperative activity with the well-established anticancer target Hsp90. However, Hsp70 is closely connected with a smaller heat shock protein, Hsp40, forming a formidable Hsp70-Hsp40 axis in various cancers, which serves as a suitable target for anticancer drug design. This review summarizes the current state and the recent developments in the field of (semi-)synthetic small molecule inhibitors directed against Hsp70 and Hsp40. The medicinal chemistry and anticancer potential of pertinent inhibitors are discussed. Since Hsp90 inhibitors have entered clinical trials but have exhibited severe adverse effects and drug resistance formation, potent Hsp70 and Hsp40 inhibitors may play a significant role in overcoming the drawbacks of Hsp90 inhibitors and other approved anticancer drugs.
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6
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Parma B, Wurdak H, Ceppi P. Harnessing mitochondrial metabolism and drug resistance in non-small cell lung cancer and beyond by blocking heat-shock proteins. Drug Resist Updat 2022; 65:100888. [DOI: 10.1016/j.drup.2022.100888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/10/2022] [Accepted: 10/25/2022] [Indexed: 11/30/2022]
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7
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Cytoplasmic proteotoxicity regulates HRI-dependent phosphorylation of eIF2α via the Hsp70-Bag3 module. iScience 2022; 25:104282. [PMID: 35573186 PMCID: PMC9097715 DOI: 10.1016/j.isci.2022.104282] [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: 11/23/2021] [Revised: 02/27/2022] [Accepted: 04/19/2022] [Indexed: 11/30/2022] Open
Abstract
The major heat shock protein Hsp70 forms a complex with a scaffold protein Bag3 that links it to components of signaling pathways. Via these interactions, the Hsp70-Bag3 module functions as a proteotoxicity sensor that controls cell signaling. Here, to search for pathways regulated by the complex, we utilized JG-98, an allosteric inhibitor of Hsp70 that blocks its interaction with Bag3. RNAseq followed by the pathway analysis indicated that several signaling pathways including UPR were activated by JG-98. Surprisingly, only the eIF2α-associated branch of the UPR was activated, while other UPR branches were not induced, suggesting that the response was unrelated to the ER proteotoxicity and ER-associated kinase PERK1. Indeed, induction of the UPR genes under these conditions was driven by a distinct eIF2α kinase HRI. Hsp70-Bag3 directly interacted with HRI and regulated eIF2α phosphorylation upon cytoplasmic proteotoxicity. Therefore, cytosolic proteotoxicity can activate certain UPR genes via Hsp70-Bag3-HRI-eIF2α axis. Disruption of Hsp70-Bag3 module activates the unfolded protein response (UPR) This induction of UPR genes is mediated by HRI-dependent phosphorylation of eIF2α Hsp70-Bag3 “monitors” cytoplasmic proteotoxicity to activate the HRI-eIF2α axis eIF2α integrates proteotoxicity signals from ER and cytoplasm
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8
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Inhibition of T-antigen expression promoting glycogen synthase kinase 3 impairs merkel cell carcinoma cell growth. Cancer Lett 2022; 524:259-267. [PMID: 34715251 DOI: 10.1016/j.canlet.2021.10.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 10/08/2021] [Accepted: 10/18/2021] [Indexed: 12/12/2022]
Abstract
Merkel cell carcinoma is an aggressive skin cancer frequently caused by the Merkel cell polyomavirus (MCPyV). Since proliferation of MCPyV-positive MCC tumor cells strictly depends on expression of the virus-encoded T antigens (TA), these proteins theoretically represent ideal targets for different kinds of therapeutic approaches. Here we developed a cell-based assay to identify compounds which specifically inhibit growth of MCC cells by repressing TA expression. Applying this technique we screened a kinase inhibitor library and identified six compounds targeting glycogen synthase kinase 3 (GSK3) such as CHIR99021 as suppressors of TA transcription in MCC cells. Involvement of GSK3α and -β in the regulation of TA-expression was confirmed by combining GSK3A knockout with inducible GSK3B shRNA knockdown since double knockouts could not be generated. Finally, we demonstrate that CHIR99021 exhibits in vivo antitumor activity in an MCC xenograft mouse model suggesting GSK3 inhibitors as potential therapeutics for the treatment of MCC in the future.
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9
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Wang X, Xie L, Zhu L. Clinicopathological significance of HSP70 expression in gastric cancer: a systematic review and meta-analysis. BMC Gastroenterol 2021; 21:437. [PMID: 34809574 PMCID: PMC8609754 DOI: 10.1186/s12876-021-01990-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Accepted: 10/22/2021] [Indexed: 11/13/2022] Open
Abstract
Background Heat shock protein 70 (HSP70) has been associated with the clinicopathological characteristics and prognosis of many cancers types, implying that it is a potential cancer biomarker. However, no consensus has been reached regarding its clinicopathological and prognostic significance in patients with gastric cancer. To address this gap, we performed a systematic review and meta-analysis. Methods We searched PubMed, Embase, and the Cochrane Library for full-text literature according to the eligibility criteria. We used the odds ratio and hazard ratio as the suitable parameters to evaluate the clinicopathological and prognostic significance of HSP70. The statistical analysis was performed using STATA 15.0. Results After inclusion and exclusion of studies based on the eligibility criteria, data of 1,307 patients with gastric cancer from 9 studies were finally included. The pooled outcomes implied that HSP70 expression was significantly correlated with higher differentiation degrees, intestinal gastric cancer, and lymphovascular invasion but not with age, gender, depth of invasion, Helicobacter pylori infection, lymph node invasion, TNM stages, and metastasis. The pooled HR showed no significant correlation between HSP70 expression and overall survival of gastric cancer patients. Conclusions Our meta-analysis showed that HSP70 plays a complicated role in the development of gastric cancer. It may be directly engaged in tumour differentiation and distant invasion but cannot be considered a biomarker for predicting the prognosis of gastric cancer.
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Affiliation(s)
- Xiaolu Wang
- The Comprehensive Cancer Centre of Drum Tower Hospital, Medical School of Nanjing University & Clinical Cancer Institute of Nanjing University, Nanjing, China
| | - Li Xie
- The Comprehensive Cancer Centre of Drum Tower Hospital, Medical School of Nanjing University & Clinical Cancer Institute of Nanjing University, Nanjing, China
| | - Lijing Zhu
- The Comprehensive Cancer Centre of Drum Tower Hospital, Medical School of Nanjing University & Clinical Cancer Institute of Nanjing University, Nanjing, China.
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10
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Gao J, Shi H, Juhlin CC, Larsson C, Lui WO. Merkel cell polyomavirus T-antigens regulate DICER1 mRNA stability and translation through HSC70. iScience 2021; 24:103264. [PMID: 34761184 PMCID: PMC8567380 DOI: 10.1016/j.isci.2021.103264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 08/13/2021] [Accepted: 10/09/2021] [Indexed: 01/07/2023] Open
Abstract
Merkel cell carcinoma is an aggressive skin malignancy, mostly caused by Merkel cell polyomavirus (MCPyV). MCPyV T-antigens can induce mature microRNA expressions through the DnaJ domain, but its underlying mechanism is still unknown. Here, we report that the T-antigens induce protein expression and mRNA stability of DICER1, a key factor in microRNA biogenesis, through heat shock cognate 70 (HSC70). HSC70 directly interacts with the AU-rich elements (ARE) of DICER1 mRNA in both coding and 3′ untranslated region in the presence of MCPyV T-antigen. The T-antigen/HSC70 interaction could induce luciferase activity of synthetic ARE-containing reporter, as well as the stability of ARE-containing mRNAs, suggesting a broader role of MCPyV T-antigens in regulating multiple mRNAs via HSC70. These findings highlight a new role for the interaction of HSC70 and MCPyV T-antigens in mRNA regulation and an undescribed regulatory mechanism of DICER1 mRNA stability and translation through its direct interaction with HSC70. MCPyV T-antigen and HSC70 interaction regulates DICER1 expression HSC70 directly binds to ARE in the 3′UTR of DICER1 for expression regulation An unknown motif in DICER1 CDS is also required for its expression regulation by LT The LT-HSC70 interaction can regulate other ARE-containing mRNAs
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Affiliation(s)
- Jiwei Gao
- Department of Oncology-Pathology, Karolinska Institutet; BioClinicum, Karolinska University Hospital, 171 64 Solna, Sweden
| | - Hao Shi
- Department of Oncology-Pathology, Karolinska Institutet; BioClinicum, Karolinska University Hospital, 171 64 Solna, Sweden
| | - C Christofer Juhlin
- Department of Oncology-Pathology, Karolinska Institutet; BioClinicum, Karolinska University Hospital, 171 64 Solna, Sweden.,Department of Pathology and Cancer Diagnostics, Karolinska University Hospital, 171 64 Solna, Sweden
| | - Catharina Larsson
- Department of Oncology-Pathology, Karolinska Institutet; BioClinicum, Karolinska University Hospital, 171 64 Solna, Sweden
| | - Weng-Onn Lui
- Department of Oncology-Pathology, Karolinska Institutet; BioClinicum, Karolinska University Hospital, 171 64 Solna, Sweden
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11
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Bhatia TN, Clark RN, Needham PG, Miner KM, Jamenis AS, Eckhoff EA, Abraham N, Hu X, Wipf P, Luk KC, Brodsky JL, Leak RK. Heat Shock Protein 70 as a Sex-Skewed Regulator of α-Synucleinopathy. Neurotherapeutics 2021; 18:2541-2564. [PMID: 34528172 PMCID: PMC8804008 DOI: 10.1007/s13311-021-01114-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/29/2021] [Indexed: 01/01/2023] Open
Abstract
The role of molecular chaperones, such as heat shock protein 70 (Hsp70), is not typically studied as a function of biological sex, but by addressing this gap we might improve our understanding of proteinopathic disorders that predominate in one sex. Therefore, we exposed male or female primary hippocampal cultures to preformed α-synuclein fibrils in a model of early-stage Lewy pathology. We first discovered that two mechanistically distinct inhibitors of Hsp70 function increased phospho-α-synuclein+ inclusions more robustly in male-derived neurons. Because Hsp70 is released into extracellular compartments and may restrict cell-to-cell transmission/amplification of α-synucleinopathy, we then tested the effects of low-endotoxin, exogenous Hsp70 (eHsp70) in primary hippocampal cultures. eHsp70 was taken up by and reduced α-synuclein+ inclusions in cells of both sexes, but pharmacological suppression of Hsp70 function attenuated the inhibitory effect of eHsp70 on perinuclear inclusions only in male neurons. In 20-month-old male mice infused with α-synuclein fibrils in the olfactory bulb, daily intranasal eHsp70 delivery also reduced inclusion numbers and the time to locate buried food. eHsp70 penetrated the limbic system and spinal cord of male mice within 3 h but was cleared within 72 h. Unexpectedly, no evidence of eHsp70 uptake from nose into brain was observed in females. A trend towards higher expression of inducible Hsp70-but not constitutive Hsp70 or Hsp40-was observed in amygdala tissues from male subjects with Lewy body disorders compared to unaffected male controls, supporting the importance of this chaperone in human disease. Women expressed higher amygdalar Hsp70 levels compared to men, regardless of disease status. Together, these data provide a new link between biological sex and a key chaperone that orchestrates proteostasis.
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Affiliation(s)
- Tarun N Bhatia
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Rachel N Clark
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Patrick G Needham
- Dept. of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kristin M Miner
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Anuj S Jamenis
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Elizabeth A Eckhoff
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Nevil Abraham
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Xiaoming Hu
- Dept. of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Peter Wipf
- Dept. of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kelvin C Luk
- Dept. of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jeffrey L Brodsky
- Dept. of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Rehana K Leak
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA.
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12
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Overcoming Immunotherapy Resistance by Targeting the Tumor-Intrinsic NLRP3-HSP70 Signaling Axis. Cancers (Basel) 2021; 13:cancers13194753. [PMID: 34638239 PMCID: PMC8507548 DOI: 10.3390/cancers13194753] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 01/09/2023] Open
Abstract
Simple Summary The tumor-intrinsic NLRP3 inflammasome is a newly recognized player in the regulation of tumor-directed immune responses and promises to provide fresh insight into how tumors respond to immunotherapy. This brief review discusses recent data describing how activation of the tumor-intrinsic NLRP3 inflammasome contributes to immune evasion and what this pathway may provide to the field of immuno-oncology both in terms of pharmacologic targets capable of boosting responses to checkpoint inhibitor therapies and predictive biomarkers indicating which tumors may be most susceptible to these new therapeutic strategies. Abstract The tumor-intrinsic NOD-like receptor family, pyrin-domain-containing-3 (NLRP3) inflammasome, plays an important role in regulating immunosuppressive myeloid cell populations in the tumor microenvironment (TME). While prior studies have described the activation of this inflammasome in driving pro-tumorigenic mechanisms, emerging data is now revealing the tumor NLRP3 inflammasome and the downstream release of heat shock protein-70 (HSP70) to regulate anti-tumor immunity and contribute to the development of adaptive resistance to anti-PD-1 immunotherapy. Genetic alterations that influence the activity of the NLRP3 signaling axis are likely to impact T cell-mediated tumor cell killing and may indicate which tumors rely on this pathway for immune escape. These studies suggest that the NLRP3 inflammasome and its secreted product, HSP70, represent promising pharmacologic targets for manipulating innate immune cell populations in the TME while enhancing responses to anti-PD-1 immunotherapy. Additional studies are needed to better understand tumor-specific regulatory mechanisms of NLRP3 to enable the development of tumor-selective pharmacologic strategies capable of augmenting responses to checkpoint inhibitor immunotherapy while minimizing unwanted off-target effects. The execution of upcoming clinical trials investigating this strategy to overcome anti-PD-1 resistance promises to provide novel insight into the role of this pathway in immuno-oncology.
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13
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Sannino S, Yates ME, Schurdak ME, Oesterreich S, Lee AV, Wipf P, Brodsky JL. Unique integrated stress response sensors regulate cancer cell susceptibility when Hsp70 activity is compromised. eLife 2021; 10:64977. [PMID: 34180400 PMCID: PMC8275131 DOI: 10.7554/elife.64977] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 06/27/2021] [Indexed: 12/11/2022] Open
Abstract
Molecular chaperones, such as Hsp70, prevent proteotoxicity and maintain homeostasis. This is perhaps most evident in cancer cells, which overexpress Hsp70 and thrive even when harboring high levels of misfolded proteins. To define the response to proteotoxic challenges, we examined adaptive responses in breast cancer cells in the presence of an Hsp70 inhibitor. We discovered that the cells bin into distinct classes based on inhibitor sensitivity. Strikingly, the most resistant cells have higher autophagy levels, and autophagy was maximally activated only in resistant cells upon Hsp70 inhibition. In turn, resistance to compromised Hsp70 function required the integrated stress response transducer, GCN2, which is commonly associated with amino acid starvation. In contrast, sensitive cells succumbed to Hsp70 inhibition by activating PERK. These data reveal an unexpected route through which breast cancer cells adapt to proteotoxic insults and position GCN2 and autophagy as complementary mechanisms to ensure survival when proteostasis is compromised.
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Affiliation(s)
- Sara Sannino
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, United States
| | - Megan E Yates
- Women's Cancer Research Center, UPMC Hillman Cancer Center, Magee-Women Research Institute, Pittsburgh, United States.,Integrative Systems Biology Program, University of Pittsburgh, Pittsburgh, United States.,Medical Scientist Training Program, University of Pittsburgh School of Medicine, Pittsburgh, United States
| | - Mark E Schurdak
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, United States.,University of Pittsburgh Drug Discovery Institute, Pittsburgh, United States
| | - Steffi Oesterreich
- Women's Cancer Research Center, UPMC Hillman Cancer Center, Magee-Women Research Institute, Pittsburgh, United States.,Integrative Systems Biology Program, University of Pittsburgh, Pittsburgh, United States.,Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, United States
| | - Adrian V Lee
- Women's Cancer Research Center, UPMC Hillman Cancer Center, Magee-Women Research Institute, Pittsburgh, United States.,Integrative Systems Biology Program, University of Pittsburgh, Pittsburgh, United States.,Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, United States
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, United States
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, United States
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14
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Stachyra K, Dudzisz-Śledź M, Bylina E, Szumera-Ciećkiewicz A, Spałek MJ, Bartnik E, Rutkowski P, Czarnecka AM. Merkel Cell Carcinoma from Molecular Pathology to Novel Therapies. Int J Mol Sci 2021; 22:6305. [PMID: 34208339 PMCID: PMC8231245 DOI: 10.3390/ijms22126305] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/24/2021] [Accepted: 06/02/2021] [Indexed: 02/07/2023] Open
Abstract
Merkel cell carcinoma (MCC) is an uncommon and highly aggressive skin cancer. It develops mostly within chronically sun-exposed areas of the skin. MCPyV is detected in 60-80% of MCC cases as integrated within the genome and is considered a major risk factor for MCC. Viral negative MCCs have a high mutation burden with a UV damage signature. Aberrations occur in RB1, TP53, and NOTCH genes as well as in the PI3K-AKT-mTOR pathway. MCC is highly immunogenic, but MCC cells are known to evade the host's immune response. Despite the characteristic immunohistological profile of MCC, the diagnosis is challenging, and it should be confirmed by an experienced pathologist. Sentinel lymph node biopsy is considered the most reliable staging tool to identify subclinical nodal disease. Subclinical node metastases are present in about 30-50% of patients with primary MCC. The basis of MCC treatment is surgical excision. MCC is highly radiosensitive. It becomes chemoresistant within a few months. MCC is prone to recurrence. The outcomes in patients with metastatic disease are poor, with a historical 5-year survival of 13.5%. The median progression-free survival is 3-5 months, and the median overall survival is ten months. Currently, immunotherapy has become a standard of care first-line therapy for advanced MCC.
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Affiliation(s)
- Karolina Stachyra
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (K.S.); (M.D.-Ś.); (E.B.); (M.J.S.); (P.R.)
- Faculty of Medicine, Medical University of Warsaw, 02-091 Warsaw, Poland
| | - Monika Dudzisz-Śledź
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (K.S.); (M.D.-Ś.); (E.B.); (M.J.S.); (P.R.)
| | - Elżbieta Bylina
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (K.S.); (M.D.-Ś.); (E.B.); (M.J.S.); (P.R.)
- Department of Clinical Trials, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Anna Szumera-Ciećkiewicz
- Department of Pathology and Laboratory Diagnostics, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland;
- Department of Diagnostic Hematology, Institute of Hematology and Transfusion Medicine, 00-791 Warsaw, Poland
| | - Mateusz J. Spałek
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (K.S.); (M.D.-Ś.); (E.B.); (M.J.S.); (P.R.)
| | - Ewa Bartnik
- Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, 02-106 Warsaw, Poland;
| | - Piotr Rutkowski
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (K.S.); (M.D.-Ś.); (E.B.); (M.J.S.); (P.R.)
| | - Anna M. Czarnecka
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (K.S.); (M.D.-Ś.); (E.B.); (M.J.S.); (P.R.)
- Department of Experimental Pharmacology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland
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15
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Ambrose AJ, Chapman E. Function, Therapeutic Potential, and Inhibition of Hsp70 Chaperones. J Med Chem 2021; 64:7060-7082. [PMID: 34009983 DOI: 10.1021/acs.jmedchem.0c02091] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Hsp70s are among the most highly conserved proteins in all of biology. Through an iterative binding and release of exposed hydrophobic residues on client proteins, Hsp70s can prevent aggregation and promote folding to the native state of their client proteins. The human proteome contains eight canonical Hsp70s. Because Hsp70s are relatively promiscuous they play a role in folding a large proportion of the proteome. Hsp70s are implicated in disease through their ability to regulate protein homeostasis. In recent years, researchers have attempted to develop selective inhibitors of Hsp70 isoforms to better understand the role of individual isoforms in biology and as potential therapeutics. Selective inhibitors have come from rational design, forced localization, and serendipity, but the development of completely selective inhibitors remains elusive. In the present review, we discuss the Hsp70 structure and function, the known Hsp70 client proteins, the role of Hsp70s in disease, and current efforts to discover Hsp70 modulators.
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Affiliation(s)
- Andrew J Ambrose
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721, United States
| | - Eli Chapman
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721, United States
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16
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Vostakolaei MA, Hatami-Baroogh L, Babaei G, Molavi O, Kordi S, Abdolalizadeh J. Hsp70 in cancer: A double agent in the battle between survival and death. J Cell Physiol 2020; 236:3420-3444. [PMID: 33169384 DOI: 10.1002/jcp.30132] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 09/23/2020] [Accepted: 10/16/2020] [Indexed: 12/11/2022]
Abstract
The heat shock protein (Hsps) superfamily, also known as molecular chaperones, are highly conserved and present in all living organisms and play vital roles in protein fate. The HspA1A (Hsp70-1), called Hsp70 in this review, is expressed at low or undetectable levels in most unstressed normal cells, but numerous studies have shown that diverse types of tumor cells express Hsp70 at the plasma membrane that leads to resistance to programmed cell death and tumor progression. Hsp70 is released into the extracellular milieu in three forms including free soluble, complexed with cancer antigenic peptides, and exosome forms. Therefore, it seems to be a promising therapeutic target in human malignancies. However, a great number of studies have indicated that both intracellular and extracellular Hsp70 have a dual function. A line of evidence presented that intracellular Hsp70 has a cytoprotective function via suppression of apoptosis and lysosomal cell death (LCD) as well as that extracellular Hsp70 can promote tumorigenesis and angiogenesis. Other evidence showed intracellular Hsp70 can promote apoptosis and membrane-associated/extracellular Hsp70 can elicit antitumor innate and adaptive immune responses. Given the contradictory functions, as a "double agent," could Hsp70 be a promising tool in the future of targeted cancer therapies? To answer this question, in this review, we will discuss the functions of Hsp70 in cancers besides inhibition and stimulation strategies for targeting Hsp70 along with their challenges.
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Affiliation(s)
- Mehdi A Vostakolaei
- Digestive Diseases Research Center, Ardabil University of Medical Sciences, Ardabil, Iran.,Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leila Hatami-Baroogh
- Department of Reproduction and Development, Royan Institute for Animal Biotechnology, ACER, Isfahan, Iran
| | - Ghader Babaei
- Department of Biochemistry, Urmia University Medical Sciences, Urmia, Iran
| | - Ommoleila Molavi
- Biotechnology Research Center, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Shirafkan Kordi
- Antimicrobial Resistance Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran.,Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Jalal Abdolalizadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Paramedical Faculty, Tabriz University of Medical Sciences, Tabriz, Iran
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17
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Pietropaolo V, Prezioso C, Moens U. Merkel Cell Polyomavirus and Merkel Cell Carcinoma. Cancers (Basel) 2020; 12:E1774. [PMID: 32635198 PMCID: PMC7407210 DOI: 10.3390/cancers12071774] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 06/26/2020] [Accepted: 06/28/2020] [Indexed: 12/12/2022] Open
Abstract
Viruses are the cause of approximately 15% of all human cancers. Both RNA and DNA human tumor viruses have been identified, with Merkel cell polyomavirus being the most recent one to be linked to cancer. This virus is associated with about 80% of Merkel cell carcinomas, a rare, but aggressive cutaneous malignancy. Despite its name, the cells of origin of this tumor may not be Merkel cells. This review provides an update on the structure and life cycle, cell tropism and epidemiology of the virus and its oncogenic properties. Putative strategies to prevent viral infection or treat virus-positive Merkel cell carcinoma patients are discussed.
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Affiliation(s)
- Valeria Pietropaolo
- Department of Public Health and Infectious Diseases, “Sapienza” University, 00185 Rome, Italy; (V.P.); (C.P.)
| | - Carla Prezioso
- Department of Public Health and Infectious Diseases, “Sapienza” University, 00185 Rome, Italy; (V.P.); (C.P.)
- IRCSS San Raffaele Pisana, Microbiology of Chronic Neuro-Degenerative Pathologies, 00166 Rome, Italy
| | - Ugo Moens
- Molecular Inflammation Research Group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø—The Arctic University of Norway, 9037 Tromsø, Norway
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18
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Artesunate Affects T Antigen Expression and Survival of Virus-Positive Merkel Cell Carcinoma. Cancers (Basel) 2020; 12:cancers12040919. [PMID: 32283634 PMCID: PMC7225937 DOI: 10.3390/cancers12040919] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/06/2020] [Accepted: 04/07/2020] [Indexed: 01/01/2023] Open
Abstract
Merkel cell carcinoma (MCC) is a rare and highly aggressive skin cancer with frequent viral etiology. Indeed, in about 80% of cases, there is an association with Merkel cell polyomavirus (MCPyV); the expression of viral T antigens is crucial for growth of virus-positive tumor cells. Since artesunate—a drug used to treat malaria—has been reported to possess additional anti-tumor as well as anti-viral activity, we sought to evaluate pre-clinically the effect of artesunate on MCC. We found that artesunate repressed growth and survival of MCPyV-positive MCC cells in vitro. This effect was accompanied by reduced large T antigen (LT) expression. Notably, however, it was even more efficient than shRNA-mediated downregulation of LT expression. Interestingly, in one MCC cell line (WaGa), T antigen knockdown rendered cells less sensitive to artesunate, while for two other MCC cell lines, we could not substantiate such a relation. Mechanistically, artesunate predominantly induces ferroptosis in MCPyV-positive MCC cells since known ferroptosis-inhibitors like DFO, BAF-A1, Fer-1 and β-mercaptoethanol reduced artesunate-induced death. Finally, application of artesunate in xenotransplanted mice demonstrated that growth of established MCC tumors can be significantly suppressed in vivo. In conclusion, our results revealed a highly anti-proliferative effect of the approved and generally well-tolerated anti-malaria compound artesunate on MCPyV-positive MCC cells, suggesting its potential usage for MCC therapy.
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19
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Terrab L, Wipf P. Hsp70 and the Unfolded Protein Response as a Challenging Drug Target and an Inspiration for Probe Molecule Development. ACS Med Chem Lett 2020; 11:232-236. [PMID: 32184949 DOI: 10.1021/acsmedchemlett.9b00583] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The unfolded protein response (UPR) is a cellular stress response mechanism that is critical for cell survival. Pharmacological modulation of the ATPase activity of the chaperone Hsp70 can trigger UPR-mediated cell death, thus removing pathogenic cells in human malignancies, or, alternatively, stimulate survival, thereby preventing apoptosis in neuronal cells and slowing the progress of inflammation, neurodegeneration, and aging. This Viewpoint highlights the complexity of the protein homeostasis network and discusses different approaches for modulating Hsp70 activity, including the use of a chemical reaction development-inspired library of Hsp70 agonists and antagonists.
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Affiliation(s)
- Leila Terrab
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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20
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Kotowski U, Erović BM, Schnöll J, Stanek V, Janik S, Steurer M, Mitulović G. Quantitative proteome analysis of Merkel cell carcinoma cell lines using SILAC. Clin Proteomics 2019; 16:42. [PMID: 31889939 PMCID: PMC6921584 DOI: 10.1186/s12014-019-9263-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 12/07/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Merkel cell carcinoma (MCC) is an aggressive neuroendocrine tumour of the skin with growing incidence. To better understand the biology of this malignant disease, immortalized cell lines are used in research for in vitro experiments. However, a comprehensive quantitative proteome analysis of these cell lines has not been performed so far. METHODS Stable isotope labelling by amino acids in cell culture (SILAC) was applied to six MCC cell lines (BroLi, MKL-1, MKL-2, PeTa, WaGa, and MCC13). Following tryptic digest of labelled proteins, peptides were analysed by mass spectrometry. Proteome patterns of MCC cell lines were compared to the proteome profile of an immortalized keratinocyte cell line (HaCaT). RESULTS In total, 142 proteins were upregulated and 43 proteins were downregulated. Altered proteins included mitoferrin-1, histone H2A type 1-H, protein-arginine deiminase type-6, heterogeneous nuclear ribonucleoproteins A2/B1, protein SLX4IP and clathrin light chain B. Furthermore, several proteins of the histone family and their variants were highly abundant in MCC cell lines. CONCLUSIONS The results of this study present a new protein map of MCC and provide deeper insights in the biology of MCC. Data are available via ProteomeXchange with identifier PXD008181.
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Affiliation(s)
- Ulana Kotowski
- Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Vienna, 1090 Vienna, Austria
| | - Boban M. Erović
- Institute of Head and Neck Diseases, Evangelical Hospital Vienna, 1180 Vienna, Austria
| | - Julia Schnöll
- Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Vienna, 1090 Vienna, Austria
| | - Victoria Stanek
- Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Vienna, 1090 Vienna, Austria
| | - Stefan Janik
- Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Vienna, 1090 Vienna, Austria
| | - Martin Steurer
- Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Vienna, 1090 Vienna, Austria
| | - Goran Mitulović
- Proteomics Core Facility, Medical University of Vienna, 1090 Vienna, Austria
- Clinical Department of Laboratory Medicine, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria
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21
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Elmallah MIY, Cordonnier M, Vautrot V, Chanteloup G, Garrido C, Gobbo J. Membrane-anchored heat-shock protein 70 (Hsp70) in cancer. Cancer Lett 2019; 469:134-141. [PMID: 31669516 DOI: 10.1016/j.canlet.2019.10.037] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/18/2019] [Accepted: 10/22/2019] [Indexed: 12/19/2022]
Abstract
Hsp70 is a highly conserved and inducible heat shock protein that belongs to the HSP70 family of molecular chaperones and plays a central role in protein homeostasis. The main function of Hsp70 is to protect cells from physiological, pathological and environmental insults, as it assists an ATP-dependent manner the process of protein folding. Since Hsp70 provides critical cell survival functions, cancer cells are assumed to rely on this chaperone. Strong evidence suggests that Hsp70 is upregulated in different type of cancers and is involved in tumor growth, invasion, migration and resistance to anti-cancer therapy. Interestingly, this Hsp70 upregulation induces Hsp70 re-location into plasma membrane. In this review, the role of Hsp70 in cancer will be discussed focusing particularly on the extracellular membrane-bound Hsp70. The mechanism by which Hsp70 is translocated to plasma membrane of tumor cells and the recent discoveries of drugs targeting this Hsp70 in cancer therapy will be also highlighted.
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Affiliation(s)
- Mohammed I Y Elmallah
- INSERM 1231, Label Ligue National contre le Cancer and Label d'excellence LipSTIC, 7 Bd Jeanne d'Arc, 21000, Dijon, France; Anti-cancer Center Georges-François Leclerc, Dijon, France; Chemistry Department, Faculty of Science, Helwan University, 11795, Ain Helwan, Cairo, Egypt.
| | - Marine Cordonnier
- INSERM 1231, Label Ligue National contre le Cancer and Label d'excellence LipSTIC, 7 Bd Jeanne d'Arc, 21000, Dijon, France; Faculty of Medicine. University of Burgundy-Franche-Comté, France
| | - Valentin Vautrot
- INSERM 1231, Label Ligue National contre le Cancer and Label d'excellence LipSTIC, 7 Bd Jeanne d'Arc, 21000, Dijon, France; Anti-cancer Center Georges-François Leclerc, Dijon, France; University of Bourgogne Franche-Comté, EA 3181, France
| | - Gaëtan Chanteloup
- INSERM 1231, Label Ligue National contre le Cancer and Label d'excellence LipSTIC, 7 Bd Jeanne d'Arc, 21000, Dijon, France; Faculty of Medicine. University of Burgundy-Franche-Comté, France
| | - Carmen Garrido
- INSERM 1231, Label Ligue National contre le Cancer and Label d'excellence LipSTIC, 7 Bd Jeanne d'Arc, 21000, Dijon, France; Anti-cancer Center Georges-François Leclerc, Dijon, France; Faculty of Medicine. University of Burgundy-Franche-Comté, France.
| | - Jessica Gobbo
- INSERM 1231, Label Ligue National contre le Cancer and Label d'excellence LipSTIC, 7 Bd Jeanne d'Arc, 21000, Dijon, France; Anti-cancer Center Georges-François Leclerc, Dijon, France
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22
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Combination of Anti-Cancer Drugs with Molecular Chaperone Inhibitors. Int J Mol Sci 2019; 20:ijms20215284. [PMID: 31652993 PMCID: PMC6862641 DOI: 10.3390/ijms20215284] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 10/21/2019] [Accepted: 10/22/2019] [Indexed: 12/15/2022] Open
Abstract
Most molecular chaperones belonging to heat shock protein (HSP) families are known to protect cancer cells from pathologic, environmental and pharmacological stress factors and thereby can hamper anti-cancer therapies. In this review, we present data on inhibitors of the heat shock response (particularly mediated by the chaperones HSP90, HSP70, and HSP27) either as a single treatment or in combination with currently available anti-cancer therapeutic approaches. An overview of the current literature reveals that the co-administration of chaperone inhibitors and targeting drugs results in proteotoxic stress and violates the tumor cell physiology. An optimal drug combination should simultaneously target cytoprotective mechanisms and trigger the imbalance of the tumor cell physiology.
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23
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Moradi-Marjaneh R, Paseban M, Moradi Marjaneh M. Hsp70 inhibitors: Implications for the treatment of colorectal cancer. IUBMB Life 2019; 71:1834-1845. [PMID: 31441584 DOI: 10.1002/iub.2157] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 07/12/2019] [Indexed: 12/22/2022]
Abstract
Colorectal cancer (CRC) is one of the most common malignancies in the world. Despite intensive advances in diagnosis and treatment of CRC, it is yet one of the leading cause of cancer related morbidity and mortality. Therefore, there is an urgent medical need for alternative therapeutic approaches to treat CRC. The 70 kDa heat shock proteins (Hsp70s) are a family of evolutionary conserved heat shock proteins, which play an important role in cell homeostasis and survival. They overexpress in various types of malignancy including CRC and are typically accompanied with poor prognosis. Hence, inhibition of Hsp70 may be considered as a striking chemotherapeutic avenue. This review summarizes the current knowledge on the progress made so far to discover compounds, which target the Hsp70 family, with particular emphasis on their efficacy in treatment of CRC. We also briefly explain the induction of Hsp70 as a strategy to prevent CRC.
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Affiliation(s)
| | - Maryam Paseban
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mahdi Moradi Marjaneh
- Cancer Division, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
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24
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Bonam SR, Ruff M, Muller S. HSPA8/HSC70 in Immune Disorders: A Molecular Rheostat that Adjusts Chaperone-Mediated Autophagy Substrates. Cells 2019; 8:E849. [PMID: 31394830 PMCID: PMC6721745 DOI: 10.3390/cells8080849] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/02/2019] [Accepted: 08/05/2019] [Indexed: 12/24/2022] Open
Abstract
HSPA8/HSC70 is a molecular chaperone involved in a wide variety of cellular processes. It plays a crucial role in protein quality control, ensuring the correct folding and re-folding of selected proteins, and controlling the elimination of abnormally-folded conformers and of proteins daily produced in excess in our cells. HSPA8 is a crucial molecular regulator of chaperone-mediated autophagy, as a detector of substrates that will be processed by this specialized autophagy pathway. In this review, we shortly summarize its structure and overall functions, dissect its implication in immune disorders, and list the known pharmacological tools that modulate its functions. We also exemplify the interest of targeting HSPA8 to regulate pathological immune dysfunctions.
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Affiliation(s)
- Srinivasa Reddy Bonam
- Neuroimmunology & peptide therapy, Biotechnology and cell signaling, CNRS-University of Strasbourg, Illkirch 67412, France/Laboratory of excellence Medalis, 67000 Strasbourg, France
| | - Marc Ruff
- Biologie Structurale Intégrative, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, 67404 Strasbourg, France
| | - Sylviane Muller
- Neuroimmunology & peptide therapy, Biotechnology and cell signaling, CNRS-University of Strasbourg, Illkirch 67412, France/Laboratory of excellence Medalis, 67000 Strasbourg, France.
- University of Strasbourg Institute for Advanced Study (USIAS), 67000 Strasbourg, France.
- Fédération Hospitalo-Universitaire (FHU) OMICARE, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg University, 67000 Strasbourg, France.
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25
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Unfolded Protein Response (UPR) in Survival, Dormancy, Immunosuppression, Metastasis, and Treatments of Cancer Cells. Int J Mol Sci 2019; 20:ijms20102518. [PMID: 31121863 PMCID: PMC6566956 DOI: 10.3390/ijms20102518] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/22/2019] [Accepted: 03/22/2019] [Indexed: 02/06/2023] Open
Abstract
The endoplasmic reticulum (ER) has diverse functions, and especially misfolded protein modification is in the focus of this review paper. With a highly regulatory mechanism, called unfolded protein response (UPR), it protects cells from the accumulation of misfolded proteins. Nevertheless, not only does UPR modify improper proteins, but it also degrades proteins that are unable to recover. Three pathways of UPR, namely PERK, IRE-1, and ATF6, have a significant role in regulating stress-induced physiological responses in cells. The dysregulated UPR may be involved in diseases, such as atherosclerosis, heart diseases, amyotrophic lateral sclerosis (ALS), and cancer. Here, we discuss the relation between UPR and cancer, considering several aspects including survival, dormancy, immunosuppression, angiogenesis, and metastasis of cancer cells. Although several moderate adversities can subject cancer cells to a hostile environment, UPR can ensure their survival. Excessive unfavorable conditions, such as overloading with misfolded proteins and nutrient deprivation, tend to trigger cancer cell death signaling. Regarding dormancy and immunosuppression, cancer cells can survive chemotherapies and acquire drug resistance through dormancy and immunosuppression. Cancer cells can also regulate the downstream of UPR to modulate angiogenesis and promote metastasis. In the end, regulating UPR through different molecular mechanisms may provide promising anticancer treatment options by suppressing cancer proliferation and progression.
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26
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Schrama D, Sarosi EM, Adam C, Ritter C, Kaemmerer U, Klopocki E, König EM, Utikal J, Becker JC, Houben R. Characterization of six Merkel cell polyomavirus-positive Merkel cell carcinoma cell lines: Integration pattern suggest that large T antigen truncating events occur before or during integration. Int J Cancer 2019; 145:1020-1032. [PMID: 30873613 DOI: 10.1002/ijc.32280] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 02/06/2019] [Accepted: 03/11/2019] [Indexed: 12/16/2022]
Abstract
Merkel cell carcinoma (MCC), an aggressive neuroendocrine skin tumor, is a polyomavirus-induced human cancer. To study the causal relationship of MCC carcinogenesis with the integrated Merkel cell polyomavirus (MCPyV) in detail, well-characterized MCC cell lines are needed. Consequently, in the current study, we established and characterized six MCPyV-positive MCC cell lines. Microarray-based comparative genomic hybridization revealed a stable genome carrying only a limited number of chromosomal gains and deletions. All cell lines expressed MCC markers Keratin-20 and neuron-specific enolase as well as truncated MCPyV-encoded large T antigen (LT). For five cell lines, we were able to identify the MCPyV-integration sites in introns of different genes. The LT-truncating stop codon mutations and integration sites were affirmed in the respective clinical patient samples. Inverse PCR suggested that three of the cell lines contained MCPyV genomes as concatemers. This notion was confirmed for the two cell lines with known integration sites. Importantly, our observation of distinct stop codon mutations in cell lines with concatemeric MCPyV integration indicates that these LT-truncating mutations occur before integration. In summary, we provide the detailed characterization of six MCPyV-positive MCC cell lines, which are likely to serve as valuable tools in future MCC research.
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Affiliation(s)
- David Schrama
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - Eva-Maria Sarosi
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - Christian Adam
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - Cathrin Ritter
- Department of Translational Skin Cancer Research (tscr), University Hospital Essen, Essen, Germany.,German Cancer Consortium (DKTK/DKFZ), Heidelberg, Germany
| | - Ulrike Kaemmerer
- Department of Gynecology, University Hospital Würzburg, Würzburg, Germany
| | - Eva Klopocki
- Institute for Human Genetics, University of Würzburg, Würzburg, Germany
| | - Eva-Maria König
- Institute for Human Genetics, University of Würzburg, Würzburg, Germany
| | - Jochen Utikal
- Skin Cancer Unit, German Cancer Research Center (DKFZ), Heidelberg, Germany.,Department of Dermatology, Venereology and Allergology, University Medical Center Mannheim, Ruprecht-Karl University of Heidelberg, Mannheim, Germany
| | - Jürgen C Becker
- Department of Translational Skin Cancer Research (tscr), University Hospital Essen, Essen, Germany.,German Cancer Consortium (DKTK/DKFZ), Heidelberg, Germany
| | - Roland Houben
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
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27
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Chiang AN, Liang M, Dominguez-Meijide A, Masaracchia C, Goeckeler-Fried JL, Mazzone CS, Newhouse DW, Kendsersky NM, Yates ME, Manos-Turvey A, Needham PG, Outeiro TF, Wipf P, Brodsky JL. Synthesis and evaluation of esterified Hsp70 agonists in cellular models of protein aggregation and folding. Bioorg Med Chem 2018; 27:79-91. [PMID: 30528127 DOI: 10.1016/j.bmc.2018.11.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 11/01/2018] [Accepted: 11/09/2018] [Indexed: 12/22/2022]
Abstract
Over-expression of the Hsp70 molecular chaperone prevents protein aggregation and ameliorates neurodegenerative disease phenotypes in model systems. We identified an Hsp70 activator, MAL1-271, that reduces α-synuclein aggregation in a Parkinson's Disease model. We now report that MAL1-271 directly increases the ATPase activity of a eukaryotic Hsp70. Next, twelve MAL1-271 derivatives were synthesized and examined in a refined α-synuclein aggregation model as well as in an assay that monitors maturation of a disease-causing Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) mutant, which is also linked to Hsp70 function. Compared to the control, MAL1-271 significantly increased the number of cells lacking α-synuclein inclusions and increased the steady-state levels of the CFTR mutant. We also found that a nitrile-containing MAL1-271 analog exhibited similar effects in both assays. None of the derivatives exhibited cellular toxicity at concentrations up to 100 μm, nor were cellular stress response pathways induced. These data serve as a gateway for the continued development of a new class of Hsp70 agonists with efficacy in these and potentially other disease models.
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Affiliation(s)
- Annette N Chiang
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Mary Liang
- Department of Chemistry, University of Pittsburgh, 758 Chevron Science Center, Pittsburgh, PA 15260, USA
| | - Antonio Dominguez-Meijide
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center Göttingen, Göttingen, Germany
| | - Caterina Masaracchia
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center Göttingen, Göttingen, Germany
| | - Jennifer L Goeckeler-Fried
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Carly S Mazzone
- Department of Chemistry, University of Pittsburgh, 758 Chevron Science Center, Pittsburgh, PA 15260, USA
| | - David W Newhouse
- Department of Chemistry, University of Pittsburgh, 758 Chevron Science Center, Pittsburgh, PA 15260, USA
| | - Nathan M Kendsersky
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Megan E Yates
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Alexandra Manos-Turvey
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA; Department of Chemistry, University of Pittsburgh, 758 Chevron Science Center, Pittsburgh, PA 15260, USA
| | - Patrick G Needham
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Tiago F Outeiro
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center Göttingen, Göttingen, Germany; Max Planck Institute for Experimental Medicine, Göttingen, Germany; Institute of Neuroscience, The Medical School, Newcastle University, Framlington Place, Newcastle Upon Tyne NE2 4HH, UK
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, 758 Chevron Science Center, Pittsburgh, PA 15260, USA
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA.
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28
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Sannino S, Guerriero CJ, Sabnis AJ, Stolz DB, Wallace CT, Wipf P, Watkins SC, Bivona TG, Brodsky JL. Compensatory increases of select proteostasis networks after Hsp70 inhibition in cancer cells. J Cell Sci 2018; 131:jcs.217760. [PMID: 30131440 DOI: 10.1242/jcs.217760] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 08/02/2018] [Indexed: 12/13/2022] Open
Abstract
Cancer cells thrive when challenged with proteotoxic stress by inducing components of the protein folding, proteasome, autophagy and unfolded protein response (UPR) pathways. Consequently, specific molecular chaperones have been validated as targets for anti-cancer therapies. For example, inhibition of Hsp70 family proteins (hereafter Hsp70) in rhabdomyosarcoma triggers UPR induction and apoptosis. To define how these cancer cells respond to compromised proteostasis, we compared rhabdomyosarcoma cells that were sensitive (RMS13) or resistant (RMS13-R) to the Hsp70 inhibitor MAL3-101. We discovered that endoplasmic reticulum-associated degradation (ERAD) and autophagy were activated in RMS13-R cells, suggesting that resistant cells overcome Hsp70 ablation by increasing misfolded protein degradation. Indeed, RMS13-R cells degraded ERAD substrates more rapidly than RMS cells and induced the autophagy pathway. Surprisingly, inhibition of the proteasome or ERAD had no effect on RMS13-R cell survival, but silencing of select autophagy components or treatment with autophagy inhibitors restored MAL3-101 sensitivity and led to apoptosis. These data indicate a route through which cancer cells overcome a chaperone-based therapy, define how cells can adapt to Hsp70 inhibition, and demonstrate the value of combined chaperone and autophagy-based therapies.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Sara Sannino
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | | | - Amit J Sabnis
- Department of Pediatrics, University of California, San Francisco, CA 94143, USA.,Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA 94143, USA
| | - Donna Beer Stolz
- Department of Medicine, University of California, San Francisco, CA 94143, USA
| | - Callen T Wallace
- Department of Medicine, University of California, San Francisco, CA 94143, USA
| | - Peter Wipf
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Simon C Watkins
- Department of Medicine, University of California, San Francisco, CA 94143, USA
| | - Trever G Bivona
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA 94143, USA.,Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
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29
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Prince T, Ackerman A, Cavanaugh A, Schreiter B, Juengst B, Andolino C, Danella J, Chernin M, Williams H. Dual targeting of HSP70 does not induce the heat shock response and synergistically reduces cell viability in muscle invasive bladder cancer. Oncotarget 2018; 9:32702-32717. [PMID: 30220976 PMCID: PMC6135696 DOI: 10.18632/oncotarget.26021] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 08/13/2018] [Indexed: 12/13/2022] Open
Abstract
Muscle invasive bladder cancer (MIBC) is a common malignancy and major cause of morbidity worldwide. Over the last decade mortality rates for MIBC have not decreased as compared to other cancers indicating a need for novel strategies. The molecular chaperones HSP70 and HSP90 fold and maintain the 3-dimensional structures of numerous client proteins that signal for cancer cell growth and survival. Inhibition of HSP70 or HSP90 results in client protein degradation and associated oncogenic signaling. Here we targeted HSP70 and HSP90 with small molecule inhibitors that trap or block each chaperone in a low client-affinity “open” conformation. HSP70 inhibitors, VER155008 (VER) and MAL3-101 (MAL), along with HSP90 inhibitor, STA-9090 (STA), were tested alone and in combination for their ability to reduce cell viability and alter protein levels in 4 MIBC cell lines. When combined, VER+MAL synergistically reduced cell viability in each MIBC cell line while not inducing expression of heat shock proteins (HSPs). STA+MAL also synergistically reduced cell viability in each cell line but induced expression of cytoprotective HSPs indicating the merits of targeting HSP70 with VER+MAL. Additionally, we observed that STA induced the expression of the stress-related transcription factor HSF2 while reducing levels of the co-chaperone TTI1.
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Affiliation(s)
- Thomas Prince
- Urology Department, Geisinger Clinic, Danville, 17822 PA, USA.,Weis Center for Research, Geisinger Clinic, Danville, 17822 PA, USA
| | - Andrew Ackerman
- Weis Center for Research, Geisinger Clinic, Danville, 17822 PA, USA
| | - Alice Cavanaugh
- Weis Center for Research, Geisinger Clinic, Danville, 17822 PA, USA
| | | | - Brendon Juengst
- Weis Center for Research, Geisinger Clinic, Danville, 17822 PA, USA
| | - Chaylen Andolino
- Biology Department, Bucknell University, Lewisburg, 17837 PA, USA
| | - John Danella
- Urology Department, Geisinger Clinic, Danville, 17822 PA, USA
| | - Mitch Chernin
- Biology Department, Bucknell University, Lewisburg, 17837 PA, USA
| | - Heinric Williams
- Urology Department, Geisinger Clinic, Danville, 17822 PA, USA.,Weis Center for Research, Geisinger Clinic, Danville, 17822 PA, USA
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30
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Gleixner AM, Hutchison DF, Sannino S, Bhatia TN, Leak LC, Flaherty PT, Wipf P, Brodsky JL, Leak RK. N-Acetyl-l-Cysteine Protects Astrocytes against Proteotoxicity without Recourse to Glutathione. Mol Pharmacol 2017; 92:564-575. [PMID: 28830914 DOI: 10.1124/mol.117.109926] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 08/17/2017] [Indexed: 02/06/2023] Open
Abstract
N-acetyl-l-cysteine (NAC) exhibits protective properties in brain injury models and has undergone a number of clinical trials. Most studies of NAC have focused on neurons. However, neuroprotection may be complemented by the protection of astrocytes because healthier astrocytes can better support the viability of neurons. Here, we show that NAC can protect astrocytes against protein misfolding stress (proteotoxicity), the hallmark of neurodegenerative disorders. Although NAC is thought to be a glutathione precursor, NAC protected primary astrocytes from the toxicity of the proteasome inhibitor MG132 without eliciting any increase in glutathione. Furthermore, glutathione depletion failed to attenuate the protective effects of NAC. MG132 elicited a robust increase in the folding chaperone heat shock protein 70 (Hsp70), and NAC mitigated this effect. Nevertheless, three independent inhibitors of Hsp70 function ablated the protective effects of NAC, suggesting that NAC may help preserve Hsp70 chaperone activity and improve protein quality control without need for Hsp70 induction. Consistent with this view, NAC abolished an increase in ubiquitinated proteins in MG132-treated astrocytes. However, NAC did not affect the loss of proteasome activity in response to MG132, demonstrating that it boosted protein homeostasis and cell viability without directly interfering with the efficacy of this proteasome inhibitor. The thiol-containing molecules l-cysteine and d-cysteine both mimicked the protective effects of NAC, whereas the thiol-lacking molecule N-acetyl-S-methyl-l-cysteine failed to exert protection or blunt the rise in ubiquitinated proteins. Collectively, these findings suggest that the thiol group in NAC is required for its effects on glial viability and protein quality control.
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Affiliation(s)
- Amanda M Gleixner
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Daniel F Hutchison
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Sara Sannino
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Tarun N Bhatia
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Lillian C Leak
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Patrick T Flaherty
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Peter Wipf
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Jeffrey L Brodsky
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
| | - Rehana K Leak
- Division of Pharmaceutical Sciences, School of Pharmacy, Duquesne University, Pittsburgh, Pennsylvania (A.M.G., D.F.H., T.N.B., L.C.L., P.T.F., R.K.L.); and Departments of Biological Sciences (S.S., J.L.B.) and Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania (P.W.)
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31
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Knips J, Czech-Sioli M, Spohn M, Heiland M, Moll I, Grundhoff A, Schumacher U, Fischer N. Spontaneous lung metastasis formation of human Merkel cell carcinoma cell lines transplanted into scid mice. Int J Cancer 2017; 141:160-171. [PMID: 28380668 DOI: 10.1002/ijc.30723] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 02/08/2017] [Accepted: 03/09/2017] [Indexed: 01/10/2023]
Abstract
Merkel cell carcinoma (MCC) is an aggressive skin cancer entity that frequently leads to rapid death due to its high propensity to metastasize. The etiology of most MCC cases is linked to Merkel cell polyomavirus (MCPyV), a virus which is monoclonally integrated in up to 95% of tumors. While there are presently no animal models to study the role of authentic MCPyV infection on transformation, tumorigenesis or metastasis formation, xenograft mouse models employing engrafted MCC-derived cell lines (MCCL) represent a promising approach to study certain aspects of MCC pathogenesis. Here, the two MCPyV-positive MCC cell lines WaGa and MKL-1 were subcutaneously engrafted in scid mice. Engraftment of both MCC cell lines resulted in the appearance of circulating tumor cells and metastasis formation, with WaGa-engrafted mice showing a significantly shorter survival time as well as increased numbers of spontaneous lung metastases compared to MKL-1 mice. Interestingly, explanted tumors compared to parental cell lines exhibit an upregulation of MCPyV sT-Antigen expression in all tumors, with WaGa tumors showing significantly higher sT-Antigen expression than MKL-1 tumors. RNA-Seq analysis of explanted tumors and parental cell lines furthermore revealed that in the more aggressive WaGa tumors, genes involved in inflammatory response, growth factor activity and Wnt signalling pathway are significantly upregulated, suggesting that sT-Antigen is the driver of the observed differences in metastasis formation.
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Affiliation(s)
- Jill Knips
- Institute of Anatomy and Experimental Morphology, University Cancer Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Manja Czech-Sioli
- Institute for Medical Microbiology, Virology and Hygiene, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Heinrich-Pette Institute, Leibniz Institute for Experimental Virology, Research Group Virus Genomics, Hamburg, Germany
| | - Michael Spohn
- Heinrich-Pette Institute, Leibniz Institute for Experimental Virology, Research Group Virus Genomics, Hamburg, Germany
| | - Max Heiland
- Department of Oral and Maxillofacial Surgery, Charité Universitätsmedizin Berlin, Germany
| | - Ingrid Moll
- Department of Dermatology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Adam Grundhoff
- Heinrich-Pette Institute, Leibniz Institute for Experimental Virology, Research Group Virus Genomics, Hamburg, Germany
| | - Udo Schumacher
- Institute of Anatomy and Experimental Morphology, University Cancer Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Nicole Fischer
- Institute for Medical Microbiology, Virology and Hygiene, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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32
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Shrestha L, Patel HJ, Chiosis G. Chemical Tools to Investigate Mechanisms Associated with HSP90 and HSP70 in Disease. Cell Chem Biol 2016; 23:158-172. [PMID: 26933742 DOI: 10.1016/j.chembiol.2015.12.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 12/08/2015] [Accepted: 12/08/2015] [Indexed: 01/22/2023]
Abstract
The chaperome is a large and diverse protein machinery composed of chaperone proteins and a variety of helpers, such as the co-chaperones, folding enzymes, and scaffolding and adapter proteins. Heat shock protein 90s and 70s (HSP90s and HSP70s), the most abundant chaperome members in human cells, are also the most complex. As we have learned to appreciate, their functions are context dependent and manifested through a variety of conformations that each recruit a subset of co-chaperone, scaffolding, and folding proteins and which are further diversified by the posttranslational modifications each carry, making their study through classic genetic and biochemical techniques quite a challenge. Chemical biology tools and techniques have been developed over the years to help decipher the complexities of the HSPs and this review provides an overview of such efforts with focus on HSP90 and HSP70.
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Affiliation(s)
- Liza Shrestha
- Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA
| | - Hardik J Patel
- Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA
| | - Gabriela Chiosis
- Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA; Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA.
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33
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Manos-Turvey A, Al-Ashtal HA, Needham PG, Hartline CB, Prichard MN, Wipf P, Brodsky JL. Dihydropyrimidinones and -thiones with improved activity against human polyomavirus family members. Bioorg Med Chem Lett 2016; 26:5087-5091. [PMID: 27624078 DOI: 10.1016/j.bmcl.2016.08.080] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 08/22/2016] [Accepted: 08/24/2016] [Indexed: 11/29/2022]
Abstract
Human polyomaviruses are generally latent but can be reactivated in patients whose immune systems are suppressed. Unfortunately, current therapeutics for diseases associated with polyomaviruses are non-specific, have undefined mechanisms of action, or exacerbate the disease. We previously reported on a class of dihydropyrimidinones that specifically target a polyomavirus-encoded protein, T antigen, and/or inhibit a cellular chaperone, Hsp70, that is required for virus replication. To improve the antiviral activity of the existing class of compounds, we performed Biginelli and modified multi-component reactions to obtain new 3,4-dihydropyrimidin-2(1H)-ones and -thiones for biological evaluation. We also compared how substituents at the N-1 versus N-3 position in the pyrimidine affect activity. We discovered that AMT580-043, a N-3 alkylated dihydropyrimidin-2(1H)-thione, inhibits the replication of a disease-causing polyomavirus in cell culture more potently than an existing drug, cidofovir.
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Affiliation(s)
- Alexandra Manos-Turvey
- Department of Biological Science, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA; Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Hiba A Al-Ashtal
- Department of Biological Science, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Patrick G Needham
- Department of Biological Science, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA
| | - Caroll B Hartline
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Mark N Prichard
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA; Center for Chemical Methodologies and Library Development, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Jeffrey L Brodsky
- Department of Biological Science, University of Pittsburgh, A320 Langley Hall, Pittsburgh, PA 15260, USA.
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34
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Ma J, Lim C, Sacher JR, Van Houten B, Qian W, Wipf P. Mitochondrial targeted β-lapachone induces mitochondrial dysfunction and catastrophic vacuolization in cancer cells. Bioorg Med Chem Lett 2015; 25:4828-4833. [PMID: 26159482 PMCID: PMC4607627 DOI: 10.1016/j.bmcl.2015.06.073] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 06/17/2015] [Accepted: 06/19/2015] [Indexed: 12/12/2022]
Abstract
Mitochondria play important roles in tumor cell physiology and survival by providing energy and metabolites for proliferation and metastasis. As part of their oncogenic status, cancer cells frequently produce increased levels of mitochondrial-generated reactive oxygen species (ROS). However, extensive stimulation of ROS generation in mitochondria has been shown to be able to induce cancer cell death, and is one of the major mechanisms of action of many anticancer agents. We hypothesized that enhancing mitochondrial ROS generation through direct targeting of a ROS generator into mitochondria will exhibit tumor cell selectivity, as well as high efficacy in inducing cancer cell death. We thus synthesized a mitochondrial targeted version of β-lapachone (XJB-Lapachone) based on our XJB mitochondrial targeting platform. We found that the mitochondrial targeted β-lapachone is more efficient in inducing apoptosis compared to unconjugated β-lapachone, and the tumor cell selectivity is maintained. XJB-Lapachone also induced extensive cellular vacuolization and autophagy at a concentration not observed with unconjugated β-lapachone. Through characterization of mitochondrial function we revealed that XJB-Lapachone is indeed more capable of stimulating ROS generation in mitochondria, which led to a dramatic mitochondrial uncoupling and autophagic degradation of mitochondria. Taken together, we have demonstrated that targeting β-lapachone accomplishes higher efficacy through inducing ROS generation directly in mitochondria, resulting in extensive mitochondrial and cellular damage. XJB-Lapachone will thus help to establish a novel platform for the design of next generation mitochondrial targeted ROS generators for cancer therapy.
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Affiliation(s)
- Jing Ma
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, and Hillman Cancer Center, University of Pittsburgh Cancer Institute, 5117 Centre Avenue, Pittsburgh, PA 15213, United States; Department of Respiratory and Critical Care Medicine, Tongji Hospital, Tongji Medical College of HuaZhong University of Science and Technology, Wuhan 430030, China
| | - Chaemin Lim
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, United States; Accelerated Chemical Discovery Center, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, United States
| | - Joshua R Sacher
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, United States
| | - Bennett Van Houten
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, and Hillman Cancer Center, University of Pittsburgh Cancer Institute, 5117 Centre Avenue, Pittsburgh, PA 15213, United States
| | - Wei Qian
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, and Hillman Cancer Center, University of Pittsburgh Cancer Institute, 5117 Centre Avenue, Pittsburgh, PA 15213, United States.
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, United States; Accelerated Chemical Discovery Center, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, United States.
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35
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Sherman MY, Gabai VL. Hsp70 in cancer: back to the future. Oncogene 2015; 34:4153-61. [PMID: 25347739 PMCID: PMC4411196 DOI: 10.1038/onc.2014.349] [Citation(s) in RCA: 166] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 09/08/2014] [Accepted: 09/22/2014] [Indexed: 12/24/2022]
Abstract
Mechanistic studies from cell culture and animal models have revealed critical roles for the heat shock protein Hsp70 in cancer initiation and progression. Surprisingly, many effects of Hsp70 on cancer have not been related to its chaperone activity, but rather to its role(s) in regulating cell signaling. A major factor that directs Hsp70 signaling activity appears to be the co-chaperone Bag3. Here, we review these recent breakthroughs, and how these discoveries drive drug development efforts.
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Affiliation(s)
- Michael Y. Sherman
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, 02118, Tel 617-638-5971, Fax 617-638-5339
| | - Vladimir L. Gabai
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, 02118, Tel 617-638-5971, Fax 617-638-5339
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36
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Needham PG, Patel HJ, Chiosis G, Thibodeau PH, Brodsky JL. Mutations in the Yeast Hsp70, Ssa1, at P417 Alter ATP Cycling, Interdomain Coupling, and Specific Chaperone Functions. J Mol Biol 2015; 427:2948-65. [PMID: 25913688 DOI: 10.1016/j.jmb.2015.04.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 04/08/2015] [Accepted: 04/17/2015] [Indexed: 01/05/2023]
Abstract
The major cytoplasmic Hsp70 chaperones in the yeast Saccharomyces cerevisiae are the Ssa proteins, and much of our understanding of Hsp70 biology has emerged from studying ssa mutant strains. For example, Ssa1 catalyzes multiple cellular functions, including protein transport and degradation, and to this end, the ssa1-45 mutant has proved invaluable. However, the biochemical defects associated with the corresponding Ssa1-45 protein (P417L) are unknown. Consequently, we characterized Ssa1 P417L, as well as a P417S variant, which corresponds to a mutation in the gene encoding the yeast mitochondrial Hsp70. We discovered that the P417L and P417S proteins exhibit accelerated ATPase activity that was similar to the Hsp40-stimulated rate of ATP hydrolysis of wild-type Ssa1. We also found that the mutant proteins were compromised for peptide binding. These data are consistent with defects in peptide-stimulated ATPase activity and with results from limited proteolysis experiments, which indicated that the mutants' substrate binding domains were highly vulnerable to digestion. Defects in the reactivation of heat-denatured luciferase were also evident. Correspondingly, yeast expressing P417L or P417S as the only copy of Ssa were temperature sensitive and exhibited defects in Ssa1-dependent protein translocation and misfolded protein degradation. Together, our studies suggest that the structure of the substrate binding domain is altered and that coupling between this domain and the nucleotide binding domain is disabled when the conserved P417 residue is mutated. Our data also provide new insights into the nature of the many cellular defects associated with the ssa1-45 allele.
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Affiliation(s)
- Patrick G Needham
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | | | - Gabriela Chiosis
- Program in Molecular Pharmacology and Chemistry; Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA
| | - Patrick H Thibodeau
- Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA.
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Crum TS, Gleixner AM, Posimo JM, Mason DM, Broeren MT, Heinemann SD, Wipf P, Brodsky JL, Leak RK. Heat shock protein responses to aging and proteotoxicity in the olfactory bulb. J Neurochem 2015; 133:780-794. [PMID: 25640060 DOI: 10.1111/jnc.13041] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/22/2014] [Accepted: 01/12/2015] [Indexed: 12/13/2022]
Abstract
The olfactory bulb is one of the most vulnerable brain regions in age-related proteinopathies. Proteinopathic stress is mitigated by the heat shock protein (Hsp) family of chaperones. Here, we describe age-related decreases in Hsc70 in the olfactory bulb of the female rat and higher levels of Hsp70 and Hsp25 in middle and old age than at 2-4 months. To model proteotoxic and oxidative stress in the olfactory bulb, primary olfactory bulb cultures were treated with the proteasome inhibitors lactacystin and MG132 or the pro-oxidant paraquat. Toxin-induced increases were observed in Hsp70, Hsp25, and Hsp32. To determine the functional consequences of the increase in Hsp70, we attenuated Hsp70 activity with two mechanistically distinct inhibitors. The Hsp70 inhibitors greatly potentiated the toxicity of sublethal lactacystin or MG132 but not of paraquat. Although ubiquitinated protein levels were unchanged with aging in vivo or with sublethal MG132 in vitro, there was a large, synergistic increase in ubiquitinated proteins when proteasome and Hsp70 functions were simultaneously inhibited. Our study suggests that olfactory bulb cells rely heavily on Hsp70 chaperones to maintain homeostasis during mild proteotoxic, but not oxidative insults, and that Hsp70 prevents the accrual of ubiquitinated proteins in these cells. The olfactory bulb is affected in the early phases of many age-related neurodegenerative disorders. Here, we described the impact of aging on multiple heat shock proteins (Hsps), such as Hsp70, in the female rat olfactory bulb in vivo. Using multiple proteasome and Hsp70 inhibitors (see schematic), we found that proteotoxicity elicited a compensatory increase in Hsp70 in primary olfactory bulb cells in vitro. Hsp70 then reduced the proteotoxic buildup of ubiquitinated proteins and robustly protected against cell death according to three independent viability assays. Thus, olfactory bulb neurons can mount impressive natural adaptations to proteotoxic injury, perhaps explaining why neurodegenerative disorders are so delayed in onset and so slow to progress.
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Affiliation(s)
- Tyler S Crum
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
| | - Amanda M Gleixner
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
| | - Jessica M Posimo
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
| | - Daniel M Mason
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
| | - Matthew T Broeren
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
| | - Scott D Heinemann
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
| | - Peter Wipf
- Departments of Chemistry and Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh PA
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh PA
| | - Rehana K Leak
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh PA
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38
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Posimo JM, Weilnau JN, Gleixner AM, Broeren MT, Weiland NL, Brodsky JL, Wipf P, Leak RK. Heat shock protein defenses in the neocortex and allocortex of the telencephalon. Neurobiol Aging 2015; 36:1924-37. [PMID: 25771395 DOI: 10.1016/j.neurobiolaging.2015.02.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 01/30/2015] [Accepted: 02/11/2015] [Indexed: 11/18/2022]
Abstract
The telencephalic allocortex develops protein inclusions before the neocortex in many age-related proteinopathies. One major defense mechanism against proteinopathic stress is the heat shock protein (Hsp) network. We therefore contrasted Hsp defenses in stressed primary neocortical and allocortical cells. Neocortical neurons were more resistant to the proteasome inhibitor MG132 than neurons from 3 allocortical subregions: entorhinal cortex, piriform cortex, and hippocampus. However, allocortical neurons exhibited higher MG132-induced increases in Hsp70 and heat shock cognate 70 (Hsc70). MG132-treated allocortical neurons also exhibited greater levels of protein ubiquitination. Inhibition of Hsp70/Hsc70 activity synergistically exacerbated MG132 toxicity in allocortical neurons more than neocortical neurons, suggesting that the allocortex is more reliant on these Hsp defenses. In contrast, astrocytes harvested from the neocortex or allocortex did not differ in their response to Hsp70/Hsc70 inhibition. Consistent with the idea that chaperones are maximally engaged in allocortical neurons, an increase in Hsp70/Hsc70 activity was protective only in neocortical neurons. Finally, the levels of select Hsps were altered in the neocortex and allocortex in vivo with aging.
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Affiliation(s)
- Jessica M Posimo
- Division of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Justin N Weilnau
- Division of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Amanda M Gleixner
- Division of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Matthew T Broeren
- Division of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Nicole L Weiland
- Division of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA; Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, USA
| | - Rehana K Leak
- Division of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA, USA.
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Samimi M, Gardair C, Nicol JTJ, Arnold F, Touzé A, Coursaget P. Merkel cell polyomavirus in merkel cell carcinoma: clinical and therapeutic perspectives. Semin Oncol 2014; 42:347-58. [PMID: 25843739 DOI: 10.1053/j.seminoncol.2014.12.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Merkel cell carcinoma (MCC) is a rare and often aggressive cutaneous cancer with a poor prognosis. The incidence of this cancer increases with age, immunodeficiency and sun exposure. Merkel cell polyomavirus (MCPyV), a new human polyomavirus identified in 2008, is detected in the majority of the MCCs and there is a growing body of evidence that healthy human skin harbors resident or transient MCPyV. A causal link between MCPyV and MCC has been evidenced and this is the first polyomavirus to be clearly implicated as a causal agent underlying a human cancer, and MCPyV was recently classified as a 2A carcinogen. MCC is thus a rare tumor caused by a very common viral skin infection. The aim of this review is to provide a basic overview of the epidemiological, clinical, and pathological characteristics of MCC, to present the current knowledge on MCPyV polyomavirus and its causal association with MCC development, and to describe the therapeutic implications of this causal link.
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Affiliation(s)
- Mahtab Samimi
- Université François Rabelais, Tours, France; CHRU de Tours-Hôpital Trousseau, Service de Dermatologie, Tours, France; Unité Mixte de Recherche INRA-Univerity of Tours N°1282, Tours, France
| | - Charlotte Gardair
- CHRU de Tours-Hôpital Trousseau, Service d׳Anatomie et Cytologie Pathologiques, Tours, France
| | - Jérome T J Nicol
- Université François Rabelais, Tours, France; Unité Mixte de Recherche INRA-Univerity of Tours N°1282, Tours, France
| | - Francoise Arnold
- Université François Rabelais, Tours, France; Unité Mixte de Recherche INRA-Univerity of Tours N°1282, Tours, France
| | - Antoine Touzé
- Université François Rabelais, Tours, France; Unité Mixte de Recherche INRA-Univerity of Tours N°1282, Tours, France
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