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Eisa NH, Crowley VM, Elahi A, Kommalapati VK, Serwetnyk MA, Llbiyi T, Lu S, Kainth K, Jilani Y, Marasco D, El Andaloussi A, Lee S, Tsai FT, Rodriguez PC, Munn D, Celis E, Korkaya H, Debbab A, Blagg B, Chadli A. Enniatin A inhibits the chaperone Hsp90 and unleashes the immune system against triple-negative breast cancer. iScience 2023; 26:108308. [PMID: 38025772 PMCID: PMC10663837 DOI: 10.1016/j.isci.2023.108308] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 08/21/2023] [Accepted: 10/20/2023] [Indexed: 12/01/2023] Open
Abstract
Low response rates and immune-related adverse events limit the remarkable impact of cancer immunotherapy. To improve clinical outcomes, preclinical studies have shown that combining immunotherapies with N-terminal Hsp90 inhibitors resulted in improved efficacy, even though induction of an extensive heat shock response (HSR) and less than optimal dosing of these inhibitors limited their clinical efficacy as monotherapies. We discovered that the natural product Enniatin A (EnnA) targets Hsp90 and destabilizes its client oncoproteins without inducing an HSR. EnnA triggers immunogenic cell death in triple-negative breast cancer (TNBC) syngeneic mouse models and exhibits superior antitumor activity compared to Hsp90 N-terminal inhibitors. EnnA reprograms the tumor microenvironment (TME) to promote CD8+ T cell-dependent antitumor immunity by reducing PD-L1 levels and activating the chemokine receptor CX3CR1 pathway. These findings provide strong evidence for transforming the immunosuppressive TME into a more tumor-hostile milieu by engaging Hsp90 with therapeutic agents involving novel mechanisms of action.
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Affiliation(s)
- Nada H. Eisa
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Vincent M. Crowley
- Department of Chemistry and Biochemistry, The University of Notre Dame, 305 McCourtney Hall, Notre Dame, IN 46556, USA
| | - Asif Elahi
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Vamsi Krishna Kommalapati
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Michael A. Serwetnyk
- Department of Chemistry and Biochemistry, The University of Notre Dame, 305 McCourtney Hall, Notre Dame, IN 46556, USA
| | - Taoufik Llbiyi
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Sumin Lu
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Kashish Kainth
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Yasmeen Jilani
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Daniela Marasco
- Department of Pharmacy, University of Naples “Federico II”, Via Montesano, 49, 80131 Naples, Italy
| | - Abdeljabar El Andaloussi
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Sukyeong Lee
- Departments of Biochemistry and Molecular Biology, Molecular and Cellular Biology, and Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Francis T.F. Tsai
- Departments of Biochemistry and Molecular Biology, Molecular and Cellular Biology, and Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Paulo C. Rodriguez
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | - David Munn
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Esteban Celis
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Hasan Korkaya
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
| | - Abdessamad Debbab
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-University Düsseldorf, Universitätsstr. 1, Building 26.23, 40225 Düsseldorf, Germany
| | - Brian Blagg
- Department of Chemistry and Biochemistry, The University of Notre Dame, 305 McCourtney Hall, Notre Dame, IN 46556, USA
| | - Ahmed Chadli
- Georgia Cancer Center, Medical College of Georgia at Augusta University, 1410 Laney Walker Boulevard, CN-3329, Augusta, GA 30912, USA
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Serwetnyk MA, Blagg BS. The disruption of protein-protein interactions with co-chaperones and client substrates as a strategy towards Hsp90 inhibition. Acta Pharm Sin B 2021; 11:1446-1468. [PMID: 34221862 PMCID: PMC8245820 DOI: 10.1016/j.apsb.2020.11.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/12/2020] [Accepted: 11/13/2020] [Indexed: 12/16/2022] Open
Abstract
The 90-kiloDalton (kD) heat shock protein (Hsp90) is a ubiquitous, ATP-dependent molecular chaperone whose primary function is to ensure the proper folding of several hundred client protein substrates. Because many of these clients are overexpressed or become mutated during cancer progression, Hsp90 inhibition has been pursued as a potential strategy for cancer as one can target multiple oncoproteins and signaling pathways simultaneously. The first discovered Hsp90 inhibitors, geldanamycin and radicicol, function by competitively binding to Hsp90's N-terminal binding site and inhibiting its ATPase activity. However, most of these N-terminal inhibitors exhibited detrimental activities during clinical evaluation due to induction of the pro-survival heat shock response as well as poor selectivity amongst the four isoforms. Consequently, alternative approaches to Hsp90 inhibition have been pursued and include C-terminal inhibition, isoform-selective inhibition, and the disruption of Hsp90 protein-protein interactions. Since the Hsp90 protein folding cycle requires the assembly of Hsp90 into a large heteroprotein complex, along with various co-chaperones and immunophilins, the development of small molecules that prevent assembly of the complex offers an alternative method of Hsp90 inhibition.
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Key Words
- ADP, adenosine diphosphate
- ATP, adenosine triphosphate
- Aha1, activator of Hsp90 ATPase homologue 1
- CTD, C-terminal domain
- Cdc37, cell division cycle 37
- Disruptors
- Grp94, 94-kD glucose-regulated protein
- HIF-1α, hypoxia-inducing factor-1α
- HIP, Hsp70-interaction protein
- HOP, Hsp70‒Hsp90 organizing protein
- HSQC, heteronuclear single quantum coherence
- Her-2, human epidermal growth factor receptor-2
- Hsp90
- Hsp90, 90-kD heat shock protein
- MD, middle domain
- NTD, N-terminal domain
- Natural products
- PPI, protein−protein interaction
- Peptidomimetics
- Protein−protein interactions
- SAHA, suberoylanilide hydroxamic acid
- SAR, structure–activity relationship
- SUMO, small ubiquitin-like modifier
- Small molecules
- TPR2A, tetratricopeptide-containing repeat 2A
- TRAP1, Hsp75tumor necrosis factor receptor associated protein 1
- TROSY, transverse relaxation-optimized spectroscopy
- hERG, human ether-à-go-go-related gene
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