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Humphries F, Shmuel-Galia L, Jiang Z, Zhou JY, Barasa L, Mondal S, Wilson R, Sultana N, Shaffer SA, Ng SL, Pesiridis GS, Thompson PR, Fitzgerald KA. Targeting STING oligomerization with small-molecule inhibitors. Proc Natl Acad Sci U S A 2023; 120:e2305420120. [PMID: 37549268 PMCID: PMC10434303 DOI: 10.1073/pnas.2305420120] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 06/29/2023] [Indexed: 08/09/2023] Open
Abstract
Stimulator of interferon genes (STING) is an essential adaptor protein required for the inflammatory response to cytosolic DNA. dsDNA activates cGAS to generate cGAMP, which binds and activates STING triggering a conformational change, oligomerization, and the IRF3- and NFκB-dependent transcription of type I Interferons (IFNs) and inflammatory cytokines, as well as the activation of autophagy. Aberrant activation of STING is now linked to a growing number of both rare as well as common chronic inflammatory diseases. Here, we identify and characterize a potent small-molecule inhibitor of STING. This compound, BB-Cl-amidine inhibits STING signaling and production of type I IFNs, IFN-stimulated genes (ISGs) and NFκB-dependent cytokines, but not other pattern recognition receptors. In vivo, BB-Cl-amidine alleviated pathology resulting from accrual of cytosolic DNA in Trex-1 mutant mice. Mechanistically BB-Cl-amidine inhibited STING oligomerization through modification of Cys148. Collectively, our work uncovers an approach to inhibit STING activation and highlights the potential of this strategy for the treatment of STING-driven inflammatory diseases.
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Affiliation(s)
- Fiachra Humphries
- Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Liraz Shmuel-Galia
- Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Zhaozhao Jiang
- Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Jeffrey Y. Zhou
- Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Leonard Barasa
- Program in Chemical Biology, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Santanu Mondal
- Program in Chemical Biology, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01605
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi110016, India
| | - Ruth Wilson
- Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Nadia Sultana
- Program in Chemical Biology, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01605
- Mass Spectrometry Facility, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01545
| | - Scott A. Shaffer
- Program in Chemical Biology, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01605
- Mass Spectrometry Facility, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01545
| | - Sze-Ling Ng
- Immunology Research Unit, GlaxoSmithKline, Philadelphia, PA19426
| | | | - Paul R. Thompson
- Program in Chemical Biology, Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA01605
| | - Katherine A. Fitzgerald
- Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA01605
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Lombardo KA, Obradovic A, Singh AK, Liu JL, Joice G, Kates M, Bishai W, McConkey D, Chaux A, Eich ML, Rezaei MK, Netto GJ, Drake CG, Tran P, Matoso A, Bivalacqua TJ. BCG invokes superior STING-mediated innate immune response over radiotherapy in a carcinogen murine model of urothelial cancer. J Pathol 2022; 256:223-234. [PMID: 34731491 PMCID: PMC8738146 DOI: 10.1002/path.5830] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 10/07/2021] [Accepted: 10/30/2021] [Indexed: 02/03/2023]
Abstract
Radiation and bacillus Calmette-Guérin (BCG) instillations are used clinically for treatment of urothelial carcinoma, but the precise mechanisms by which they activate an immune response remain elusive. The role of the cGAS-STING pathway has been implicated in both BCG and radiation-induced immune response; however, comparison of STING pathway molecules and the immune landscape following treatment in urothelial carcinoma has not been performed. We therefore comprehensively analyzed the local immune response in the bladder tumor microenvironment following radiotherapy and BCG instillations in a well-established spontaneous murine model of urothelial carcinoma to provide insight into activation of STING-mediated immune response. Mice were exposed to the oral carcinogen, BBN, for 12 weeks prior to treatment with a single 15 Gy dose of radiation or three intravesical instillations of BCG (1 × 108 CFU). At sacrifice, tumors were staged by a urologic pathologist and effects of therapy on the immune microenvironment were measured using the NanoString Myeloid Innate Immunity Panel and immunohistochemistry. Clinical relevance was established by measuring immune biomarker expression of cGAS and STING on a human tissue microarray consisting of BCG-treated non-muscle-invasive urothelial carcinomas. BCG instillations in the murine model elevated STING and downstream STING-induced interferon and pro-inflammatory molecules, intratumoral M1 macrophage and T-cell accumulation, and complete tumor eradication. In contrast, radiotherapy caused no changes in STING pathway or innate immune gene expression; rather, it induced M2 macrophage accumulation and elevated FoxP3 expression characteristic of immunosuppression. In human non-muscle-invasive bladder cancer, STING protein expression was elevated at baseline in patients who responded to BCG therapy and increased further after BCG therapy. Overall, these results show that STING pathway activation plays a key role in effective BCG-induced immune response and strongly indicate that the effects of BCG on the bladder cancer immune microenvironment are more beneficial than those induced by radiation. © 2021 The Pathological Society of Great Britain and Ireland.
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Affiliation(s)
- Kara A Lombardo
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
- Greenberg Bladder Cancer Institute, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Aleksandar Obradovic
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY, USA
- Center for Translational Immunology, Columbia University Irving Medical Center, New York, NY, USA
| | - Alok Kumar Singh
- Center for Tuberculosis Research, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - James L Liu
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Gregory Joice
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Max Kates
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - William Bishai
- Center for Tuberculosis Research, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - David McConkey
- Greenberg Bladder Cancer Institute, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Alcides Chaux
- Department of Scientific Research, School of Postgraduate Studies, Norte University, 1614 Asunción, Paraguay
| | - Marie-Lisa Eich
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - M Katayoon Rezaei
- Department of Pathology, George Washington University, Washington, DC, USA
| | - George J Netto
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Charles G Drake
- Division of Urology, Oncology, Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY, USA
- Division Hematology and Oncology, Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY, USA
- Center for Translational Immunology, Columbia University Irving Medical Center, New York, NY, USA
| | - Phuoc Tran
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
- Department of Radiation Oncology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Andres Matoso
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
- Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
- Greenberg Bladder Cancer Institute, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Trinity J Bivalacqua
- Department of Urology, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
- Greenberg Bladder Cancer Institute, The Johns Hopkins Medical Institutions, Baltimore, MD, USA
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