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Guerrero-Ochoa P, Rodríguez-Zapater S, Anel A, Esteban LM, Camón-Fernández A, Espilez-Ortiz R, Gil-Sanz MJ, Borque-Fernando Á. Prostate Cancer and the Mevalonate Pathway. Int J Mol Sci 2024; 25:2152. [PMID: 38396837 PMCID: PMC10888820 DOI: 10.3390/ijms25042152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 02/04/2024] [Accepted: 02/07/2024] [Indexed: 02/25/2024] Open
Abstract
Antineoplastic therapies for prostate cancer (PCa) have traditionally centered around the androgen receptor (AR) pathway, which has demonstrated a significant role in oncogenesis. Nevertheless, it is becoming progressively apparent that therapeutic strategies must diversify their focus due to the emergence of resistance mechanisms that the tumor employs when subjected to monomolecular treatments. This review illustrates how the dysregulation of the lipid metabolic pathway constitutes a survival strategy adopted by tumors to evade eradication efforts. Integrating this aspect into oncological management could prove valuable in combating PCa.
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Affiliation(s)
- Patricia Guerrero-Ochoa
- Health Research Institute of Aragon Foundation, 50009 Zaragoza, Spain; (P.G.-O.); (A.C.-F.); (R.E.-O.); (M.J.G.-S.)
| | - Sergio Rodríguez-Zapater
- Minimally Invasive Research Group (GITMI), Faculty of Veterinary Medicine, University of Zaragoza, 50009 Zaragoza, Spain;
| | - Alberto Anel
- Department of Biochemistry and Molecular and Cellular Biology, Faculty of Sciences, University of Zaragoza, 50009 Zaragoza, Spain;
| | - Luis Mariano Esteban
- Department of Applied Mathematics, Escuela Universitaria Politécnica de La Almunia, Institute for Biocomputation and Physic of Complex Systems, Universidad de Zaragoza, 50100 La Almunia de Doña Godina, Spain
| | - Alejandro Camón-Fernández
- Health Research Institute of Aragon Foundation, 50009 Zaragoza, Spain; (P.G.-O.); (A.C.-F.); (R.E.-O.); (M.J.G.-S.)
| | - Raquel Espilez-Ortiz
- Health Research Institute of Aragon Foundation, 50009 Zaragoza, Spain; (P.G.-O.); (A.C.-F.); (R.E.-O.); (M.J.G.-S.)
- Department of Urology, Miguel Servet University Hospital, 50009 Zaragoza, Spain
- Area of Urology, Department of Surgery, Faculty of Medicine, University of Zaragoza, 50009 Zaragoza, Spain
| | - María Jesús Gil-Sanz
- Health Research Institute of Aragon Foundation, 50009 Zaragoza, Spain; (P.G.-O.); (A.C.-F.); (R.E.-O.); (M.J.G.-S.)
- Department of Urology, Miguel Servet University Hospital, 50009 Zaragoza, Spain
| | - Ángel Borque-Fernando
- Health Research Institute of Aragon Foundation, 50009 Zaragoza, Spain; (P.G.-O.); (A.C.-F.); (R.E.-O.); (M.J.G.-S.)
- Department of Applied Mathematics, Escuela Universitaria Politécnica de La Almunia, Institute for Biocomputation and Physic of Complex Systems, Universidad de Zaragoza, 50100 La Almunia de Doña Godina, Spain
- Department of Urology, Miguel Servet University Hospital, 50009 Zaragoza, Spain
- Area of Urology, Department of Surgery, Faculty of Medicine, University of Zaragoza, 50009 Zaragoza, Spain
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2
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Wang L, Dou X, Chen S, Yu X, Huang X, Zhang L, Chen Y, Wang J, Yang K, Bugno J, Pitroda S, Ding X, Piffko A, Si W, Chen C, Jiang H, Zhou B, Chmura SJ, Luo C, Liang HL, He C, Weichselbaum RR. YTHDF2 inhibition potentiates radiotherapy antitumor efficacy. Cancer Cell 2023; 41:1294-1308.e8. [PMID: 37236197 PMCID: PMC10524856 DOI: 10.1016/j.ccell.2023.04.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 12/23/2022] [Accepted: 04/28/2023] [Indexed: 05/28/2023]
Abstract
RNA N6-methyladenosine (m6A) modification is implicated in cancer progression. However, the impact of m6A on the antitumor effects of radiotherapy and the related mechanisms are unknown. Here we show that ionizing radiation (IR) induces immunosuppressive myeloid-derived suppressor cell (MDSC) expansion and YTHDF2 expression in both murine models and humans. Following IR, loss of Ythdf2 in myeloid cells augments antitumor immunity and overcomes tumor radioresistance by altering MDSC differentiation and inhibiting MDSC infiltration and suppressive function. The remodeling of the landscape of MDSC populations by local IR is reversed by Ythdf2 deficiency. IR-induced YTHDF2 expression relies on NF-κB signaling; YTHDF2 in turn leads to NF-κB activation by directly binding and degrading transcripts encoding negative regulators of NF-κB signaling, resulting in an IR-YTHDF2-NF-κB circuit. Pharmacological inhibition of YTHDF2 overcomes MDSC-induced immunosuppression and improves combined IR and/or anti-PD-L1 treatment. Thus, YTHDF2 is a promising target to improve radiotherapy (RT) and RT/immunotherapy combinations.
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Affiliation(s)
- Liangliang Wang
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA
| | - Xiaoyang Dou
- Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL 60637, USA; Howard Hughes Medical Institute, University of Chicago, Chicago, IL 60637, USA
| | - Shijie Chen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Xianbin Yu
- Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL 60637, USA; Howard Hughes Medical Institute, University of Chicago, Chicago, IL 60637, USA
| | - Xiaona Huang
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA
| | - Linda Zhang
- Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL 60637, USA; Howard Hughes Medical Institute, University of Chicago, Chicago, IL 60637, USA
| | - Yantao Chen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Jiaai Wang
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA
| | - Kaiting Yang
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA
| | - Jason Bugno
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA; The Committee on Clinical Pharmacology and Pharmacogenomics, University of Chicago, Chicago, IL 600637, USA
| | - Sean Pitroda
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA
| | - Xingchen Ding
- Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Andras Piffko
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA; Department of Neurosurgery, University Medical Center Hamburg-Eppendorf, Hamburg 20246, Germany
| | - Wei Si
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Chao Chen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Hualiang Jiang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Bing Zhou
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Steven J Chmura
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA
| | - Cheng Luo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China; Zhongshan Institute for Drug Discovery, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Zhongshan 528437, China.
| | - Hua Laura Liang
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA.
| | - Chuan He
- Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL 60637, USA; Howard Hughes Medical Institute, University of Chicago, Chicago, IL 60637, USA; Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA.
| | - Ralph R Weichselbaum
- Department of Radiation and Cellular Oncology, University of Chicago, Chicago, IL 60637, USA; Ludwig Center for Metastasis Research, University of Chicago, Chicago, IL 60637, USA.
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3
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Mukherjee D, Romano E, Walshaw R, Zeef LAH, Banyard A, Kitcatt SJ, Cheadle EJ, Tuomela K, Pendharkar S, Al-Deka A, Salerno B, Raby S, Mills IG, Honeychurch J, Illidge TM. Reprogramming the immunosuppressive tumor microenvironment results in successful clearance of tumors resistant to radiation therapy and anti-PD-1/PD-L1. Oncoimmunology 2023; 12:2223094. [PMID: 37332616 PMCID: PMC10274532 DOI: 10.1080/2162402x.2023.2223094] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 05/18/2023] [Accepted: 06/06/2023] [Indexed: 06/20/2023] Open
Abstract
Despite breakthroughs in immune checkpoint inhibitors (ICI), the majority of tumors, including those poorly infiltrated by CD8+ T cells or heavily infiltrated by immunosuppressive immune effector cells, are unlikely to result in clinically meaningful tumor responses. Radiation therapy (RT) has been combined with ICI to potentially overcome this resistance and improve response rates but reported clinical trial results have thus far been disappointing. Novel approaches are required to overcome this resistance and reprogram the immunosuppressive tumor microenvironment (TME) and address this major unmet clinical need. Using diverse preclinical tumor models of prostate and bladder cancer, including an autochthonous prostate tumor (Pten-/-/trp53-/-) that respond poorly to radiation therapy (RT) and anti-PD-L1 combinations, the key drivers of this resistance within the TME were profiled and used to develop rationalized combination therapies that simultaneously enhance activation of anti-cancer T cell responses and reprogram the immunosuppressive TME. The addition of anti-CD40mAb to RT resulted in an increase in IFN-y signaling, activation of Th-1 pathways with an increased infiltration of CD8+ T-cells and regulatory T-cells with associated activation of the CTLA-4 signaling pathway in the TME. Anti-CTLA-4mAb in combination with RT further reprogrammed the immunosuppressive TME, resulting in durable, long-term tumor control. Our data provide novel insights into the underlying mechanisms of the immunosuppressive TME that result in resistance to RT and anti-PD-1 inhibitors and inform therapeutic approaches to reprogramming the immune contexture in the TME to potentially improve tumor responses and clinical outcomes.
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Affiliation(s)
- Debayan Mukherjee
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Erminia Romano
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Richard Walshaw
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Leo A. H. Zeef
- Bioinformatics Core Facility, Michael Smith Building, The University of Manchester, Manchester, UK
| | - Antonia Banyard
- Mass and Flow Cytometry Core Facility, Cancer Research UK Manchester Institute, The University of Manchester, Manchester, UK
| | - Stephen J. Kitcatt
- Scientific Computing Core Facility, Cancer Research UK Manchester Institute, The University of Manchester, Manchester, UK
| | - Eleanor J. Cheadle
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Karoliina Tuomela
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Swati Pendharkar
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Aws Al-Deka
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Beatrice Salerno
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Sophie Raby
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Ian G. Mills
- Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
- Patrick G. Johnston Centre for Cancer Research, Queen’s University of Belfast, Belfast, UK
| | - Jamie Honeychurch
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
| | - Tim M. Illidge
- Targeted Therapy Group, Division of Cancer Sciences, Faculty of Biology Medicine and Health, The University of Manchester, Manchester, UK
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4
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Steiner I, Flores-Tellez TDNJ, Mevel R, Ali A, Wang P, Schofield P, Behan C, Forsythe N, Ashton G, Taylor C, Mills IG, Oliveira P, McDade SS, Zaiss DM, Choudhury A, Lacaud G, Baena E. Autocrine activation of MAPK signaling mediates intrinsic tolerance to androgen deprivation in LY6D prostate cancer cells. Cell Rep 2023; 42:112377. [PMID: 37060563 DOI: 10.1016/j.celrep.2023.112377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/12/2022] [Accepted: 03/23/2023] [Indexed: 04/16/2023] Open
Abstract
The emergence of castration-resistant prostate cancer remains an area of unmet clinical need. We recently identified a subpopulation of normal prostate progenitor cells, characterized by an intrinsic resistance to androgen deprivation and expression of LY6D. We here demonstrate that conditional deletion of PTEN in the murine prostate epithelium causes an expansion of transformed LY6D+ progenitor cells without impairing stem cell properties. Transcriptomic analyses of LY6D+ luminal cells identified an autocrine positive feedback loop, based on the secretion of amphiregulin (AREG)-mediated activation of mitogen-activated protein kinase (MAPK) signaling, increasing cellular fitness and organoid formation. Pharmacological interference with this pathway overcomes the castration-resistant properties of LY6D+ cells with a suppression of organoid formation and loss of LY6D+ cells in vivo. Notably, LY6D+ tumor cells are enriched in high-grade and androgen-resistant prostate cancer, providing clinical evidence for their contribution to advanced disease. Our data indicate that early interference with MAPK inhibitors can prevent progression of castration-resistant prostate cancer.
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Affiliation(s)
- Ivana Steiner
- Prostate Oncobiology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Teresita Del N J Flores-Tellez
- Prostate Oncobiology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Renaud Mevel
- Stem Cell Biology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Amin Ali
- Prostate Oncobiology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK; Belfast-Manchester Movember Centre of Excellence, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Pengbo Wang
- Prostate Oncobiology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Pieta Schofield
- Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Caron Behan
- Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Nicholas Forsythe
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, BT9 7BL Northern Ireland, UK; Belfast-Manchester Movember Centre of Excellence, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Garry Ashton
- Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Catherine Taylor
- The Christie NHS Foundation Trust, Manchester Academic Health Sciences Centre, M20 4BX Manchester, UK
| | - Ian G Mills
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, BT9 7BL Northern Ireland, UK; Belfast-Manchester Movember Centre of Excellence, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK; Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, OX3 9DU Oxford, UK; Department of Clinical Sciences and Centre for Cancer Biomarkers, University of Bergen, 7804 Bergen, Norway
| | - Pedro Oliveira
- Department of Pathology, The Christie NHS Foundation Trust, M20 4BX Manchester, UK
| | - Simon S McDade
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, BT9 7BL Northern Ireland, UK; Belfast-Manchester Movember Centre of Excellence, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Dietmar M Zaiss
- Department of Immune Medicine, University Regensburg, Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Regensburg, and Leibniz Institute for Immunotherapy (LIT), 93053 Regensburg, Germany
| | - Ananya Choudhury
- The Christie NHS Foundation Trust, Manchester Academic Health Sciences Centre, M20 4BX Manchester, UK; The University of Manchester, Manchester Cancer Research Centre, M20 4BX Manchester, UK; Belfast-Manchester Movember Centre of Excellence, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Georges Lacaud
- Stem Cell Biology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK
| | - Esther Baena
- Prostate Oncobiology Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK; Belfast-Manchester Movember Centre of Excellence, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, SK10 4TG Macclesfield, UK.
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Jiménez-Cortegana C, Galassi C, Klapp V, Gabrilovich DI, Galluzzi L. Myeloid-Derived Suppressor Cells and Radiotherapy. Cancer Immunol Res 2022; 10:545-557. [DOI: 10.1158/2326-6066.cir-21-1105] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 01/21/2022] [Accepted: 02/22/2022] [Indexed: 11/16/2022]
Abstract
Abstract
Myeloid-derived suppressor cells (MDSC) are a heterogeneous population of pathologically activated, mostly immature, myeloid cells that exert robust immunosuppressive functions. MDSCs expand during oncogenesis and have been linked to accelerated disease progression and resistance to treatment in both preclinical tumor models and patients with cancer. Thus, MDSCs stand out as promising targets for the development of novel immunotherapeutic regimens with superior efficacy. Here, we summarize accumulating preclinical and clinical evidence indicating that MDSCs also hamper the efficacy of radiotherapy (RT), as we critically discuss the potential of MDSC-targeting strategies as tools to achieve superior immunotherapeutic tumor control by RT in the clinic.
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Affiliation(s)
- Carlos Jiménez-Cortegana
- Department of Radiation Oncology, Weill Cornell Medical College, New York, New York
- Department of Medical Biochemistry, Molecular Biology and Immunology, Faculty of Medicine, University of Seville, Seville, Spain
| | - Claudia Galassi
- Department of Radiation Oncology, Weill Cornell Medical College, New York, New York
| | - Vanessa Klapp
- Department of Radiation Oncology, Weill Cornell Medical College, New York, New York
| | | | - Lorenzo Galluzzi
- Department of Radiation Oncology, Weill Cornell Medical College, New York, New York
- Sandra and Edward Meyer Cancer Center, New York, New York
- Caryl and Israel Englander Institute for Precision Medicine, New York, New York
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Pang L, Ernst M, Huynh J. Development of a Multiplex Immunohistochemistry Workflow to Investigate the Immune Microenvironment in Mouse Models of Inflammatory Bowel Disease and Colon Cancer. Int J Mol Sci 2021; 22:ijms222011001. [PMID: 34681666 PMCID: PMC8539370 DOI: 10.3390/ijms222011001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/07/2021] [Accepted: 10/08/2021] [Indexed: 12/23/2022] Open
Abstract
Multiplex immunohistochemistry (mIHC) enables simultaneous staining of multiple immune markers on a single tissue section. Mounting studies have demonstrated the versatility of mIHC in evaluating immune infiltrates in different diseases and the tumour microenvironment (TME). However, the majority of published studies are limited to the analysis of human patient samples. Performing mIHC on formalin-fixed paraffin-embedded (FFPE) mouse tissues, particularly with sensitive antigens, remain challenging. The aim of our study was to develop a robust and reproducible protocol to uncover the immune landscape in mouse FFPE tissues. Effective antibody stripping while maintaining sensitivity to antigens and tissue adhesion to the glass slide is critical in developing an mIHC panel to allow successive rounds of staining. Thus, we identified a highly efficient stripping method that preserves signal intensity and antigenicity to allow multiple rounds of staining. We subsequently optimised an mIHC workflow with antibodies specific against CD4, CD8α, FOXP3 and B220 to identify distinct T and B cell populations on mouse FFPE tissues. Lastly, the application of this mIHC panel was validated in a mouse model of inflammatory bowel cancer, two allograft mouse models of spontaneous colon adenocarcinoma and a sporadic mouse model of colon cancer. Together, these demonstrate the utility of the aforementioned protocol in establishing the quantity and spatial localisation of immune cells in different pathological tissues.
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