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Daneshmandi S, Yan Q, Choi JE, Katsuta E, MacDonald CR, Goruganthu M, Roberts N, Repasky EA, Singh PK, Attwood K, Wang J, Landesman Y, McCarthy PL, Mohammadpour H. Exportin 1 governs the immunosuppressive functions of myeloid-derived suppressor cells in tumors through ERK1/2 nuclear export. Cell Mol Immunol 2024; 21:873-891. [PMID: 38902348 PMCID: PMC11291768 DOI: 10.1038/s41423-024-01187-1] [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: 10/17/2023] [Accepted: 05/14/2024] [Indexed: 06/22/2024] Open
Abstract
Myeloid-derived suppressor cells (MDSCs) are a main driver of immunosuppression in tumors. Understanding the mechanisms that determine the development and immunosuppressive function of these cells could provide new therapeutic targets to improve antitumor immunity. Here, using preclinical murine models, we discovered that exportin 1 (XPO1) expression is upregulated in tumor MDSCs and that this upregulation is induced by IL-6-induced STAT3 activation during MDSC differentiation. XPO1 blockade transforms MDSCs into T-cell-activating neutrophil-like cells, enhancing the antitumor immune response and restraining tumor growth. Mechanistically, XPO1 inhibition leads to the nuclear entrapment of ERK1/2, resulting in the prevention of ERK1/2 phosphorylation following the IL-6-mediated activation of the MAPK signaling pathway. Similarly, XPO1 blockade in human MDSCs induces the formation of neutrophil-like cells with immunostimulatory functions. Therefore, our findings revealed a critical role for XPO1 in MDSC differentiation and suppressive functions; exploiting these new discoveries revealed new targets for reprogramming immunosuppressive MDSCs to improve cancer therapeutic responses.
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Affiliation(s)
- Saeed Daneshmandi
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Qi Yan
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Jee Eun Choi
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Eriko Katsuta
- Department of Oncology, Yokohama City University, Graduate School of Medicine, Yokohama, Japan
| | - Cameron R MacDonald
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Mounika Goruganthu
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Nathan Roberts
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Elizabeth A Repasky
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Prashant K Singh
- Department of Cancer Genetics & Genomics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Kristopher Attwood
- Department of Biostatistics & Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Jianmin Wang
- Department of Biostatistics & Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | | | - Philip L McCarthy
- Department of Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Hemn Mohammadpour
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA.
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2
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Suba Z. DNA Damage Responses in Tumors Are Not Proliferative Stimuli, but Rather They Are DNA Repair Actions Requiring Supportive Medical Care. Cancers (Basel) 2024; 16:1573. [PMID: 38672654 PMCID: PMC11049279 DOI: 10.3390/cancers16081573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/05/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND In tumors, somatic mutagenesis presumably drives the DNA damage response (DDR) via altered regulatory pathways, increasing genomic instability and proliferative activity. These considerations led to the standard therapeutic strategy against cancer: the disruption of mutation-activated DNA repair pathways of tumors. PURPOSE Justifying that cancer cells are not enemies to be killed, but rather that they are ill human cells which have the remnants of physiologic regulatory pathways. RESULTS 1. Genomic instability and cancer development may be originated from a flaw in estrogen signaling rather than excessive estrogen signaling; 2. Healthy cells with genomic instability exhibit somatic mutations, helping DNA restitution; 3. Somatic mutations in tumor cells aim for the restoration of DNA damage, rather than further genomic derangement; 4. In tumors, estrogen signaling drives the pathways of DNA stabilization, leading to apoptotic death; 5. In peritumoral cellular infiltration, the genomic damage of the tumor induces inflammatory cytokine secretion and increased estrogen synthesis. In the inflammatory cells, an increased growth factor receptor (GFR) signaling confers the unliganded activation of estrogen receptors (ERs); 6. In breast cancer cells responsive to genotoxic therapy, constitutive mutations help the upregulation of estrogen signaling and consequential apoptosis. In breast tumors non-responsive to genotoxic therapy, the possibilities for ER activation via either liganded or unliganded pathways are exhausted, leading to farther genomic instability and unrestrained proliferation. CONCLUSIONS Understanding the real character and behavior of human tumors at the molecular level suggests that we should learn the genome repairing methods of tumors and follow them by supportive therapy, rather than provoking additional genomic damages.
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Affiliation(s)
- Zsuzsanna Suba
- Department of Molecular Pathology, National Institute of Oncology, Ráth György Str. 7-9, H-1122 Budapest, Hungary
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3
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Bekić M, Tomić S. Myeloid-derived suppressor cells in the therapy of autoimmune diseases. Eur J Immunol 2023; 53:e2250345. [PMID: 37748117 DOI: 10.1002/eji.202250345] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/14/2023] [Accepted: 09/20/2023] [Indexed: 09/27/2023]
Abstract
Myeloid-derived suppressor cells (MDSCs) are well recognized as critical factors in the pathology of tumors. However, their roles in autoimmune diseases are still unclear, which hampers the development of efficient immunotherapies. The role of different MDSCs subsets in multiple sclerosis, inflammatory bowel diseases, rheumatoid arthritis, type 1 diabetes, and systemic lupus erythematosus displayed different mechanisms of immune suppression, and several studies pointed to MDSCs' capacity to induce T-helper (Th)17 cells and tissue damage. These results also suggested that MDSCs could be present in different functional states and utilize different mechanisms for controlling the activity of T and B cells. Therefore, various therapeutic strategies should be employed to restore homeostasis in autoimmune diseases. The therapies harnessing MDSCs could be designed either as cell therapy or rely on the expansion and activation of MDSCs in vivo, or their depletion. Cumulatively, MDSCs are inevitable players in autoimmunity, and rational approaches in developing therapies are required to avoid the adverse effects of MDSCs and harness their suppressive mechanisms to improve the overall efficacy of autoimmunity therapy.
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Affiliation(s)
- Marina Bekić
- Institute for the Application of Nuclear Energy, University in Belgrade, Beograd, Serbia
| | - Sergej Tomić
- Institute for the Application of Nuclear Energy, University in Belgrade, Beograd, Serbia
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4
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Ostrand-Rosenberg S, Lamb TJ, Pawelec G. Here, There, and Everywhere: Myeloid-Derived Suppressor Cells in Immunology. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 210:1183-1197. [PMID: 37068300 PMCID: PMC10111205 DOI: 10.4049/jimmunol.2200914] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 01/06/2023] [Indexed: 04/19/2023]
Abstract
Myeloid-derived suppressor cells (MDSCs) were initially identified in humans and mice with cancer where they profoundly suppress T cell- and NK cell-mediated antitumor immunity. Inflammation is a central feature of many pathologies and normal physiological conditions and is the dominant driving force for the accumulation and function of MDSCs. Therefore, MDSCs are present in conditions where inflammation is present. Although MDSCs are detrimental in cancer and conditions where cellular immunity is desirable, they are beneficial in settings where cellular immunity is hyperactive. Because MDSCs can be generated ex vivo, they are being exploited as therapeutic agents to reduce damaging cellular immunity. In this review, we discuss the detrimental and beneficial roles of MDSCs in disease settings such as bacterial, viral, and parasitic infections, sepsis, obesity, trauma, stress, autoimmunity, transplantation and graft-versus-host disease, and normal physiological settings, including pregnancy and neonates as well as aging. The impact of MDSCs on vaccination is also discussed.
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Affiliation(s)
- Suzanne Ostrand-Rosenberg
- Division of Microbiology and Immunology, Department of Pathology, University of Utah 84112, Salt Lake City, UT
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112, USA
| | - Tracey J. Lamb
- Division of Microbiology and Immunology, Department of Pathology, University of Utah 84112, Salt Lake City, UT
| | - Graham Pawelec
- Department of Immunology, Interfaculty Institute for Cell Biology, University of Tübingen, Tübingen, Germany, and Health Sciences North Research Institute, Sudbury, ON, Canada
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5
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Shi ZY, Yang C, Lu LY, Lin CX, Liang S, Li G, Zhou HM, Zheng JM. Inhibition of hexokinase 2 with 3-BrPA promotes MDSCs differentiation and immunosuppressive function. Cell Immunol 2023; 385:104688. [PMID: 36774675 DOI: 10.1016/j.cellimm.2023.104688] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 12/08/2022] [Accepted: 02/03/2023] [Indexed: 02/08/2023]
Abstract
The adoptive transfer of ex vivo generated myeloid-derived suppressor cells (MDSCs) may be a promising therapeutic strategy for preventing allograft rejection after solid organ transplantation. Currently, the precise role of immune-metabolic pathways in the differentiation and function of MDSCs is not fully understood. Hexokinase 2 (HK2) is an isoform of hexokinase and is a key enzyme involved in the increased aerobic glycolysis of different immune cells during their activation and function. Here, we demonstrate that the addition of HK2 inhibitor 3-Bromopyruvic acid (3-BrPA) into traditional MDSCs induction system in vitro significantly promoted MDSCs production and enhanced their immunosuppressive function. Treatment with 3-BrPA increased the expression of MDSC-related immunosuppressive molecules, such as iNOS, Arg1, and CXCR2. Moreover, the adoptive transfer of 3-BrPA-treated MDSCs significantly prolonged the survival time of mouse heart allografts. This study provides a novel strategy to solve the problems of harvesting enough autologous cells for MDSC production from sick patients, and producing functionally enhanced MDSCs for preventing graft rejection and inducing tolerance.
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Affiliation(s)
- Zhan-Yue Shi
- Department of Cardiothoracic Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Chao Yang
- Department of Organ Transplantation, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510000, China
| | - Liu-Yi Lu
- Department of Cardiothoracic Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China; Research Center of Medicine, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Can-Xiang Lin
- Department of Plastic Surgery, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Shi Liang
- Department of Cardiothoracic Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Gen Li
- Department of Cardiothoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hong-Min Zhou
- Department of Cardiothoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Jun-Meng Zheng
- Department of Cardiothoracic Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
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6
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Wang Q, Shao X, Zhang Y, Zhu M, Wang FXC, Mu J, Li J, Yao H, Chen K. Role of tumor microenvironment in cancer progression and therapeutic strategy. Cancer Med 2023. [PMID: 36807772 DOI: 10.1002/cam4.5698] [Citation(s) in RCA: 33] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 01/18/2023] [Accepted: 02/02/2023] [Indexed: 02/23/2023] Open
Abstract
Cancer is now considered a tumor microenvironment (TME) disease, although it was originally thought to be a cell and gene expression disorder. Over the past 20 years, significant advances have been made in understanding the complexity of the TME and its impact on responses to various anticancer therapies, including immunotherapies. Cancer immunotherapy can recognize and kill cancer cells by regulating the body's immune system. It has achieved good therapeutic effects in various solid tumors and hematological malignancies. Recently, blocking of programmed death-1 (PD-1), programmed death-1 ligand-1 (PD-L1), and programmed death Ligand-2 (PD-L2), the construction of antigen chimeric T cells (CAR-T) and tumor vaccines have become popular immunotherapies Tumorigenesis, progression, and metastasis are closely related to TME. Therefore, we review the characteristics of various cells and molecules in the TME, the interaction between PD-1 and TME, and promising cancer immunotherapy therapeutics.
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Affiliation(s)
- Qingjing Wang
- Shulan International Medical College, Zhejiang Shuren University, Hangzhou, China
| | - Xueting Shao
- Institute of Pharmaceutical Biotechnology & Research Center for Clinical Pharmacy, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yuxuan Zhang
- Shulan International Medical College, Zhejiang Shuren University, Hangzhou, China
| | - Miaojin Zhu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Frederick X C Wang
- The EnMed Program at Houston Methodist Hospital, Texas A&M University College of Medicine and College of Engineering, Houston, Texas, USA
| | - Jianjian Mu
- Shulan International Medical College, Zhejiang Shuren University, Hangzhou, China
| | - Jiaxuan Li
- Shulan International Medical College, Zhejiang Shuren University, Hangzhou, China
| | - Hangping Yao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Keda Chen
- Shulan International Medical College, Zhejiang Shuren University, Hangzhou, China
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7
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Cheng X, Zhang H, Hamad A, Huang H, Tsung A. Surgery-mediated tumor-promoting effects on the immune microenvironment. Semin Cancer Biol 2022; 86:408-419. [PMID: 35066156 DOI: 10.1016/j.semcancer.2022.01.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 02/07/2023]
Abstract
Surgical resection continues to be the mainstay treatment for solid cancers even though chemotherapy and immunotherapy have significantly improved patient overall survival and progression-free survival. Numerous studies have shown that surgery induces the dissemination of circulating tumor cells (CTCs) and that the resultant inflammatory response promotes occult tumor growth and the metastatic process by forming a supportive tumor microenvironment (TME). Surgery-induced platelet activation is one of the initial responses to a wound and the formation of fibrin clots can provide the scaffold for recruited inflammatory cells. Activated platelets can also shield CTCs to protect them from blood shear forces and promote CTCs evasion of immune destruction. Similarly, neutrophils are recruited to the fibrin clot and enhance cancer metastatic dissemination and progression by forming neutrophil extracellular traps (NETs). Activated macrophages are also recruited to surgical sites to facilitate the metastatic spread. More importantly, the body's response to surgical insult results in the recruitment and expansion of immunosuppressive cell populations (i.e. myeloid-derived suppressor cells and regulatory T cells) and in the suppression of natural killer (NK) cells that contribute to postoperative cancer recurrence and metastasis. In this review, we seek to provide an overview of the pro-tumorigenic mechanisms resulting from surgery's impact on these cells in the TME. Further understanding of these events will allow for the development of perioperative therapeutic strategies to prevent surgery-associated metastasis.
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Affiliation(s)
- Xiang Cheng
- Division of Surgical Oncology, Department of Surgery, The Ohio State University James Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Hongji Zhang
- Division of Surgical Oncology, Department of Surgery, The Ohio State University James Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Ahmad Hamad
- Division of Surgical Oncology, Department of Surgery, The Ohio State University James Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Hai Huang
- Division of Surgical Oncology, Department of Surgery, The Ohio State University James Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Allan Tsung
- Division of Surgical Oncology, Department of Surgery, The Ohio State University James Comprehensive Cancer Center, Columbus, OH, 43210, USA.
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8
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Interplay between fat cells and immune cells in bone: Impact on malignant progression and therapeutic response. Pharmacol Ther 2022; 238:108274. [DOI: 10.1016/j.pharmthera.2022.108274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 08/11/2022] [Accepted: 08/23/2022] [Indexed: 11/20/2022]
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9
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Islam T, Ahsan MA, Hassan M, Afrin H, Pena-Zacarias J, Aldalbahi A, Alvarado-Tenorio B, Noveron JC, Nurunnabi M. Detection of Leptin Using Electrocatalyst Mediated Impedimetric Sensing. ACS Biomater Sci Eng 2022; 9:2170-2180. [PMID: 36149264 DOI: 10.1021/acsbiomaterials.2c00642] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Obesity is a complex disorder associated with immense health consequences including high risk of cardiovascular diseases, diabetes, and cancer. Abnormality in the thyroid gland, genetics, less physical activity, uptake of excessive diet, and leptin resistance are critical factors in the development of obesity. To determine the treatment strategy, understanding the pathophysiology of obesity is crucial. For instances, leptin resistance mediated obesity defined by the presence of excessive leptin hormone (Lep) in the systemic circulation is very common in diet induced obesity. Therefore, our hypothesis is that quantitative measurement of Lep from blood can help to identify individuals with Lep resistant mediated obesity and thereby guide toward a proper treatment strategy. In this work, we aim to utilize an electrochemical immunosensing platform for diagnosis of obesity by measuring the Lep content in systemic circulation. A porous carbon confined FeNi bimetallic system was synthesized with three different ratios of Fe and Ni ions using high temperature pyrolysis technique. The suitability of the sensor for detecting Lep was studied using both CV and EIS techniques. The limit of detection (LOD) for GCE was recorded as 157.4 fg/mL with a wide linear concentration range of 500 fg/mL to 80 ng/mL, while for SPCE the LOD was 184.9 fg/mL with a linear range of 500 fg/mL to 50 ng/mL. Finally, the feasibility and applicability of the sensor for Lep detection was tested with serum collected from high fat diet induced obese rats. The selectivity, sensitivity, storage, and experimental stability and reproducibility tests showed potential for this biosensor platform as a point-of-care Lep detection device.
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Affiliation(s)
- Tamanna Islam
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Texas at El Paso, El Paso, Texas 79902, United States
| | - Md Ariful Ahsan
- Department of Chemistry, University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
| | - Masud Hassan
- Global Centre for Environmental Remediation, College of Engineering, Science and Environment, University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Humayra Afrin
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Texas at El Paso, El Paso, Texas 79902, United States
| | - Jaqueline Pena-Zacarias
- Biological Sciences Program, College of Science, University of Texas at El Paso, El Paso, Texas 79902, United States
| | - Ali Aldalbahi
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Bonifacio Alvarado-Tenorio
- Instituto de Ciencias Biomédicas, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez, Chihuahua 32315, Mexico
| | - Juan C Noveron
- Department of Chemistry, University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
| | - Md Nurunnabi
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Texas at El Paso, El Paso, Texas 79902, United States.,Aerospace Center (cSETR), University of Texas at El Paso, El Paso, Texas 79965, United States.,Biomedical Engineering, College of Engineering, University of Texas at El Paso, El Paso, Texas 79965, United States
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10
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Shin DS, Park K, Garon E, Dubinett S. Targeting EZH2 to overcome the resistance to immunotherapy in lung cancer. Semin Oncol 2022; 49:S0093-7754(22)00045-8. [PMID: 35851153 DOI: 10.1053/j.seminoncol.2022.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 06/08/2022] [Accepted: 06/11/2022] [Indexed: 12/22/2022]
Abstract
Unleashing the immune system to fight cancer has been a major breakthrough in cancer therapeutics since 2014 when anti-PD-1 antibodies (pembrolizumab and nivolumab) were approved for patients with metastatic melanoma. Therapeutic indications have rapidly expanded for many types of advanced cancer, including lung cancer. A variety of antibodies targeting the PD-1/PD-L1 checkpoint are contributing to this paradigm shift. The field now confronts two salient challenges: first, to improve the therapeutic outcome given the low response rate across the histologies; second, to identify biomarkers for improved patient selection. Pre-clinical and clinical studies are underway to evaluate combinatorial treatments to improve the therapeutic outcome paired with correlative studies to identify the factors associated with response and resistance. One of the emerging strategies is to combine epigenetic modifiers with immune checkpoint blockade (ICB) based on the evidence that targeting epigenetic elements can enhance anti-tumor immunity by reshaping the tumor microenvironment (TME). We will briefly review pleotropic biological functions of enhancer of zeste homolog 2 (EZH2), the enzymatic subunit of polycomb repressive complex 2 (PRC2), clinical developments of oral EZH2 inhibitors, and potentially promising approaches to combine EZH2 inhibitors and PD-1 blockade for patients with advanced solid tumors, focusing on lung cancer.
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Affiliation(s)
- Daniel Sanghoon Shin
- Department of Medicine, Division of Hematology/Oncology, University of California Los Angeles, Los Angeles, CA, USA; VA Greater Los Angeles Healthcare System, Division of Hematology/Oncology, CA, USA; Member of Molecular Biology Institute, UCLA, CA, USA; Member of Jonsson Comprehensive Cancer Center, UCLA, CA, USA.
| | - Kevin Park
- Department of Medicine, Division of Hematology/Oncology, University of California Los Angeles, Los Angeles, CA, USA
| | - Edward Garon
- Department of Medicine, Division of Hematology/Oncology, University of California Los Angeles, Los Angeles, CA, USA; Member of Jonsson Comprehensive Cancer Center, UCLA, CA, USA
| | - Steven Dubinett
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, University of California Los Angeles, Los Angeles, CA, USA; Departments of Pathology, Laboratory Medicine, University of California Los Angeles, Los Angeles, CA, USA; Department of Molecular and Medical Pharmacology University of California Los Angeles, CA, USA; VA Greater Los Angeles Healthcare System, Division of Hematology/Oncology, CA, USA; Member of Molecular Biology Institute, UCLA, CA, USA; Member of Jonsson Comprehensive Cancer Center, UCLA, CA, USA
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11
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Kalyanaraman B, Cheng G, Hardy M. Therapeutic Targeting of Tumor Cells and Tumor Immune Microenvironment Vulnerabilities. Front Oncol 2022; 12:816504. [PMID: 35756631 PMCID: PMC9214210 DOI: 10.3389/fonc.2022.816504] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 05/20/2022] [Indexed: 12/22/2022] Open
Abstract
Therapeutic targeting of tumor vulnerabilities is emerging as a key area of research. This review is focused on exploiting the vulnerabilities of tumor cells and the immune cells in the tumor immune microenvironment (TIME), including tumor hypoxia, tumor acidity, the bidirectional proton-coupled monocarboxylate transporters (MCTs) of lactate, mitochondrial oxidative phosphorylation (OXPHOS), and redox enzymes in the tricarboxylic acid cycle. Cancer cells use glucose for energy even under normoxic conditions. Although cancer cells predominantly rely on glycolysis, many have fully functional mitochondria, suggesting that mitochondria are a vulnerable target organelle in cancer cells. Thus, one key distinction between cancer and normal cell metabolism is metabolic reprogramming. Mitochondria-targeted small molecule inhibitors of OXPHOS inhibit tumor proliferation and growth. Another hallmark of cancer is extracellular acidification due lactate accumulation. Emerging results show that lactate acts as a fuel for mitochondrial metabolism and supports tumor proliferation and growth. Metabolic reprogramming occurs in glycolysis-deficient tumor phenotypes and in kinase-targeted, drug-resistant cancers overexpressing OXPHOS genes. Glycolytic cancer cells located away from the vasculature overexpress MCT4 transporter to prevent overacidification by exporting lactate, and the oxidative cancer cells located near the vasculature express MCT1 transporter to provide energy through incorporation of lactate into the tricarboxylic acid cycle. MCTs are, therefore, a vulnerable target in cancer metabolism. MCT inhibitors exert synthetic lethality in combination with metformin, a weak inhibitor of OXPHOS, in cancer cells. Simultaneously targeting multiple vulnerabilities within mitochondria shows synergistic antiproliferative and antitumor effects. Developing tumor-selective, small molecule inhibitors of OXPHOS with a high therapeutic index is critical to fully exploiting the mitochondrial vulnerabilities. We and others developed small-molecule inhibitors containing triphenylphosphonium cation that potently inhibit OXPHOS in tumor cells and tissues. Factors affecting tumor cell vulnerabilities also impact immune cells in the TIME. Glycolytic tumor cells supply lactate to the tumor-suppressing regulatory T cells overexpressing MCTs. Therapeutic opportunities for targeting vulnerabilities in tumor cells and the TIME, as well as the implications on cancer health disparities and cancer treatment, are addressed.
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Affiliation(s)
- Balaraman Kalyanaraman
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI, United States.,Center for Disease Prevention Research, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Gang Cheng
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Micael Hardy
- Aix Marseille Univ, Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Radicalaire (ICR), Marseille, France
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12
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Kang TG, Kwon KW, Kim K, Lee I, Kim MJ, Ha SJ, Shin SJ. Viral coinfection promotes tuberculosis immunopathogenesis by type I IFN signaling-dependent impediment of Th1 cell pulmonary influx. Nat Commun 2022; 13:3155. [PMID: 35672321 PMCID: PMC9174268 DOI: 10.1038/s41467-022-30914-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 05/06/2022] [Indexed: 01/09/2023] Open
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is often exacerbated upon coinfection, but the underlying immunological mechanisms remain unclear. Here, to elucidate these mechanisms, we use an Mtb and lymphocytic choriomeningitis virus coinfection model. Viral coinfection significantly suppresses Mtb-specific IFN-γ production, with elevated bacterial loads and hyperinflammation in the lungs. Type I IFN signaling blockade rescues the Mtb-specific IFN-γ response and ameliorates lung immunopathology. Single-cell sequencing, tissue immunofluorescence staining, and adoptive transfer experiments indicate that viral infection-induced type I IFN signaling could inhibit CXCL9/10 production in myeloid cells, ultimately impairing pulmonary migration of Mtb-specific CD4+ T cells. Thus, our study suggests that augmented and sustained type I IFNs by virus coinfection prior to the pulmonary localization of Mtb-specific Th1 cells exacerbates TB immunopathogenesis by impeding the Mtb-specific Th1 cell influx. Our study highlights a negative function of viral coinfection-induced type I IFN responses in delaying Mtb-specific Th1 responses in the lung. Viral coinfection alongside mycobacterium tuberculosis (Mtb) infection may lead to immune complications or interference with immune responses. Here the authors show that in mice infected with Mtb and LCMV virus the specific TH1 response to MTb is reduced through a type I IFN response to the infecting virus.
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Affiliation(s)
- Tae Gun Kang
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.,Brain Korea 21 (BK21) FOUR Program, Yonsei Education & Research Center for Biosystems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Kee Woong Kwon
- Department of Microbiology, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Kyungsoo Kim
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.,Institute for Breast Cancer Precision Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Insuk Lee
- Department of Biotechnology, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
| | - Myeong Joon Kim
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.,Brain Korea 21 (BK21) FOUR Program, Yonsei Education & Research Center for Biosystems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Sang-Jun Ha
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea. .,Brain Korea 21 (BK21) FOUR Program, Yonsei Education & Research Center for Biosystems, Yonsei University, Seoul, 03722, Republic of Korea.
| | - Sung Jae Shin
- Department of Microbiology, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea. .,Institute for Immunology and Immunological Disease, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea.
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Nitsche LJ, Mukherjee S, Cheruvu K, Krabak C, Rachala R, Ratnakaram K, Sharma P, Singh M, Yendamuri S. Exploring the Impact of the Obesity Paradox on Lung Cancer and Other Malignancies. Cancers (Basel) 2022; 14:cancers14061440. [PMID: 35326592 PMCID: PMC8946288 DOI: 10.3390/cancers14061440] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 03/01/2022] [Accepted: 03/09/2022] [Indexed: 02/06/2023] Open
Abstract
Simple Summary Studies have shown that obesity is associated with many adverse health effects, including worse cancer outcomes. Many studies paradoxically suggest a survival benefit for obesity in treatment outcomes of cancers such as non-small-cell lung cancer. This relationship is not seen in animal models. We hypothesize that this relationship is secondary to suboptimal quantification of adiposity, enhanced immunotherapy response, and variables such as sex, medications, and smoking status. There are many ways to measure and classify adiposity, but the ability to distinguish abdominal obesity is likely key in predicting accurate prognosis. There are many ways obesity impacts cancer treatment course from diagnosis to survivorship. In this paper, we aim to analyze the factors contributing to the obesity paradox and its effect on lung cancer. This can aid the treatment and prognosis of lung cancer and may support further research into obesity-specific impacts on this malignancy. Abstract There is a paradoxical relationship between obesity, as measured by BMI, and many types of cancer, including non-small-cell lung cancer. Obese non-small-cell lung cancer patients have been shown to fare better than their non-obese counterparts. To analyze the multifaceted effects of obesity on oncologic outcomes, we reviewed the literature on the obesity paradox, methods to measure adiposity, the obesity-related derangements in immunology and metabolism, and the oncologic impact of confounding variables such as gender, smoking, and concomitant medications such as statins and metformin. We analyzed how these aspects may contribute to the obesity paradox and cancer outcomes with a focus on lung cancer. We concluded that the use of BMI to measure adiposity is limited and should be replaced by a method that can differentiate abdominal obesity. We also concluded that the concomitant metabolic and immunologic derangements caused by obesity contribute to the obesity paradox. Medications, gender, and smoking are additional variables that impact oncologic outcomes, and further research needs to be performed to solidify the mechanisms.
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Affiliation(s)
- Lindsay Joyce Nitsche
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Sarbajit Mukherjee
- Department of Medicine, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA;
| | - Kareena Cheruvu
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Cathleen Krabak
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Rohit Rachala
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Kalyan Ratnakaram
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Priyanka Sharma
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Maddy Singh
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
| | - Sai Yendamuri
- Department of Thoracic Surgery, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, NY 14263, USA; (L.J.N.); (K.C.); (C.K.); (R.R.); (K.R.); (P.S.); (M.S.)
- Correspondence: ; Tel.: +1-716-8458675
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14
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Kalyanaraman B. Exploiting the tumor immune microenvironment and immunometabolism using mitochondria-targeted drugs: Challenges and opportunities in racial disparity and cancer outcome research. FASEB J 2022; 36:e22226. [PMID: 35233843 PMCID: PMC9242412 DOI: 10.1096/fj.202101862r] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/08/2022] [Accepted: 02/11/2022] [Indexed: 12/16/2022]
Abstract
Black and Hispanic cancer patients have a higher incidence of cancer mortality. Many factors (e.g., socioeconomic differences, insufficient access to healthcare) contribute to racial disparity. Emerging research implicates biological disparity in cancer outcomes. Studies show distinct differences in the tumor immune microenvironment (TIME) in Black cancer patients. Studies also have linked altered mitochondrial metabolism to changes in immune cell activation in TIME. Recent publications revealed a novel immunomodulatory role for triphenylphosphonium‐based mitochondrial‐targeted drugs (MTDs). These are synthetically modified, naturally occurring molecules (e.g., honokiol, magnolol, metformin) or FDA‐approved small molecule drugs (e.g., atovaquone, hydroxyurea). Modifications involve conjugating the parent molecule via an alkyl linker chain to a triphenylphosphonium moiety. These modified molecules (e.g., Mito‐honokiol, Mito‐magnolol, Mito‐metformin, Mito‐atovaquone, Mito‐hydroxyurea) accumulate in tumor cell mitochondria more effectively than in normal cells and inhibit mitochondrial respiration, induce reactive oxygen species, activate AMPK and redox transcription factors, and inhibit cancer cell proliferation. Besides these intrinsic effects of MTDs in redox signaling and proliferation in tumors, MTDs induced extrinsic effects in the TIME of mouse xenografts. MTD treatment inhibited tumor‐suppressive immune cells, myeloid‐derived suppressor cells, and regulatory T cells, and activated T cells and antitumor immune effects. One key biological disparity in Black cancer patients was related to altered mitochondrial oxidative metabolism; MTDs targeting vulnerabilities in tumor cells and the TIME may help us understand this biological disparity. Clinical trials should include an appropriate number of Black and Hispanic cancer patients and should validate the intratumoral, antihypoxic effects of MTDs with imaging.
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Affiliation(s)
- Balaraman Kalyanaraman
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.,Center for Disease Prevention Research, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
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15
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An J, Feng L, Ren J, Li Y, Li G, Liu C, Yao Y, Yao Y, Jiang Z, Gao Y, Xu Y, Wang Y, Li J, Liu J, Cao L, Qi Z, Yang L. Chronic stress promotes breast carcinoma metastasis by accumulating myeloid-derived suppressor cells through activating β-adrenergic signaling. Oncoimmunology 2021; 10:2004659. [PMID: 34858728 PMCID: PMC8632282 DOI: 10.1080/2162402x.2021.2004659] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Numerous studies have found that chronic stress could promote tumor progression and this may be related to inhibtion of immune system. Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of cells with immunosuppressive activity. MDSCs may represent a key link between chronic stress and tumor progression. However, the role of stress-induced MDSCs in breast cancer progression is unclear. The present study showed that pre-exposure of chronic stress could lead to MDSCs elevation and facilitated breast cancer metastasis in tumor-bearing mice. Adoptive transfer of MDSCs could significantly increase lung metastatic foci. In contrast, lung metastasis could be alleviated by depleting endogenous MDSCs with Gr-1 antibody. The concentration of norepinephrine in serum and the expression of tyrosine hydroxylase in bone marrow could be significantly elevated by chronic stress. Moreover, propranolol, an inhibitor of β-adrenergic signaling, could inhibit breast carcinoma metastasis and prevent the expansion of chronic stress-induced MDSCs. Further study revealed that the expressions of IL-6 and JAK/STAT3 signaling pathways were upregulated by chronic stress in mice, and this upregulation could be inhibited by propranolol. Blocking the IL-6 signal or inhibiting the activation of the JAK/STAT3 signaling pathway could reduce tumor growth and metastasis by attenuating the accumulation of MDSCs in vivo. Besides, propranolol inhibited the expression of IL-6 in supernatant of 4T1 cells induced by isoproterenol and reduced the proportion of inducible MDSCs in vitro. Taken together, these data indicated that chronic stress may accumulate MDSCs via activation of β-adrenergic signaling and IL-6/STAT3 pathway, thereby promoting breast carcinoma metastasis.
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Affiliation(s)
- Jiale An
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Lifeng Feng
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Jiling Ren
- Department of Pathogen Biology, School of Basic Medical Science, Tianjin Medical University, Tianjin, China
| | - Yafei Li
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Guangru Li
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Chang Liu
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Yong Yao
- Department of Nuclear Medicine, The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, Shenzhen, Guangdong, China
| | - Ye Yao
- Department of Pathogen Biology, School of Basic Medical Science, Tianjin Medical University, Tianjin, China
| | - Zecheng Jiang
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Yang Gao
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Yang Xu
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Yachen Wang
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Jing Li
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Jie Liu
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Lei Cao
- Department of General Surgery, Tianjin Union Medical Center, Tianjin, China
| | - Zhi Qi
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
| | - Liang Yang
- Department of Molecular Pharmacology, School of Medicine, Nankai University, Tianjin, China
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Pancreatic Cancer Small Extracellular Vesicles (Exosomes): A Tale of Short- and Long-Distance Communication. Cancers (Basel) 2021; 13:cancers13194844. [PMID: 34638330 PMCID: PMC8508300 DOI: 10.3390/cancers13194844] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/21/2021] [Accepted: 09/24/2021] [Indexed: 12/12/2022] Open
Abstract
Simple Summary Even today, pancreatic cancer still has a dismal prognosis. It is characterized by a lack of early symptoms and thus late diagnosis as well as early metastasis. The majority of patients suffer from pancreatic ductal adenocarcinoma (PDAC). PDACs communicate extensively with cellular components of their microenvironment, but also with distant metastatic niches to facilitate tumor progression and dissemination. This crosstalk is substantially enabled by small extracellular vesicles (sEVs, exosomes) with a size of 30–150 nm that are released from the tumor cells. sEVs carry bioactive cargos that reprogram target cells to promote tumor growth, migration, metastasis, immune evasion, or chemotherapy resistance. Interestingly, sEVs also carry novel diagnostic, prognostic and potentially also predictive biomarkers. Moreover, engineered sEVs may be utilized as therapeutic agents, improving treatment options. The role of sEVs for PDAC development, progression, diagnosis, prognosis, and treatment is the focus of this review. Abstract Even with all recent advances in cancer therapy, pancreatic cancer still has a dismal 5-year survival rate of less than 7%. The most prevalent tumor subtype is pancreatic ductal adenocarcinoma (PDAC). PDACs display an extensive crosstalk with their tumor microenvironment (TME), e.g., pancreatic stellate cells, but also immune cells to regulate tumor growth, immune evasion, and metastasis. In addition to crosstalk in the local TME, PDACs were shown to induce the formation of pre-metastatic niches in different organs. Recent advances have attributed many of these interactions to intercellular communication by small extracellular vesicles (sEVs, exosomes). These nanovesicles are derived of endo-lysosomal structures (multivesicular bodies) with a size range of 30–150 nm. sEVs carry various bioactive cargos, such as proteins, lipids, DNA, mRNA, or miRNAs and act in an autocrine or paracrine fashion to educate recipient cells. In addition to tumor formation, progression, and metastasis, sEVs were described as potent biomarker platforms for diagnosis and prognosis of PDAC. Advances in sEV engineering have further indicated that sEVs might once be used as effective drug carriers. Thus, extensive sEV-based communication and applications as platform for biomarker analysis or vehicles for treatment suggest a major impact of sEVs in future PDAC research.
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Myeloid-derived suppressor cells: Multi-talented immune suppressive cells that can be either helpful or harmful. Cell Immunol 2021; 365:104374. [PMID: 34038759 DOI: 10.1016/j.cellimm.2021.104374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Fenselau C, Ostrand-Rosenberg S. Molecular cargo in myeloid-derived suppressor cells and their exosomes. Cell Immunol 2021; 359:104258. [PMID: 33338939 PMCID: PMC7802618 DOI: 10.1016/j.cellimm.2020.104258] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/25/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022]
Abstract
Collaborative research is reviewed in which mass spectrometry-based proteomics and next generation sequencing were used qualitatively and quantitatively to interrogate proteins and RNAs carried in intact myeloid-derived suppressor cells (MDSC) and exosomes shed in vitro by MDSC. In aggregate exosomes more than 4000 proteins were identified, including annexins and immunosuppressive mediators. Bioassays showed that exosomes induce MDSC chemotaxis dependent on S100A8 and S100A9 in their cargo. Surface selective chemistry identified glycoproteins on MDSC and exosome surfaces, including CD47 and thrombospondin 1, which both facilitate exosome-catalyzed chemotaxis. Large numbers of mRNAs and microRNAs were identified in aggregate exosomes, whose potential functions in receptor cells include angiogenesis, and proinflammatory and immunosuppressive activities. Inflammation was found to have asymmetric effects on MDSC and exosomal cargos. Collectively, our findings indicate that the exosomes shed by MDSC provide divergent and complementary functions that support the immunosuppression and tumor promotion activities of MDSC.
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Affiliation(s)
- Catherine Fenselau
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, United States.
| | - Suzanne Ostrand-Rosenberg
- Department of Biological Sciences, University of Maryland, Baltimore County, MD 20742, United States; Department of Pathology, University of Utah, Huntsman Cancer Institute, Salt Lake City, UT 84112, United States
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