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Batoon L, Koh AJ, Millard SM, Grewal J, Choo FM, Kannan R, Kinnaird A, Avey M, Teslya T, Pettit AR, McCauley LK, Roca H. Induction of osteoblast apoptosis stimulates macrophage efferocytosis and paradoxical bone formation. Bone Res 2024; 12:43. [PMID: 39103355 DOI: 10.1038/s41413-024-00341-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 04/03/2024] [Accepted: 05/09/2024] [Indexed: 08/07/2024] Open
Abstract
Apoptosis is crucial for tissue homeostasis and organ development. In bone, apoptosis is recognized to be a main fate of osteoblasts, yet the relevance of this process remains underexplored. Using our murine model with inducible Caspase 9, the enzyme that initiates intrinsic apoptosis, we triggered apoptosis in a proportion of mature osteocalcin (OCN+) osteoblasts and investigated the impact on postnatal bone development. Osteoblast apoptosis stimulated efferocytosis by osteal macrophages. A five-week stimulation of OCN+ osteoblast apoptosis in 3-week-old male and female mice significantly enhanced vertebral bone formation while increasing osteoblast precursors. A similar treatment regimen to stimulate osterix+ cell apoptosis had no impact on bone volume or density. The vertebral bone accrual following stimulation of OCN+ osteoblast apoptosis did not translate in improved mechanical strength due to disruption of the lacunocanalicular network. The observed bone phenotype was not influenced by changes in osteoclasts but was associated with stimulation of macrophage efferocytosis and vasculature formation. Phenotyping of efferocytic macrophages revealed a unique transcriptomic signature and expression of factors including VEGFA. To examine whether macrophages participated in the osteoblast precursor increase following osteoblast apoptosis, macrophage depletion models were employed. Depletion of macrophages via clodronate-liposomes and the CD169-diphtheria toxin receptor mouse model resulted in marked reduction in leptin receptor+ and osterix+ osteoblast precursors. Collectively, this work demonstrates the significance of osteoblast turnover via apoptosis and efferocytosis in postnatal bone formation. Importantly, it exposes the potential of targeting this mechanism to promote bone anabolism in the clinical setting.
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Affiliation(s)
- Lena Batoon
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Amy Jean Koh
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Susan Marie Millard
- Mater Research Institute, The University of Queensland, Brisbane, QLD, 4102, Australia
| | - Jobanpreet Grewal
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Fang Ming Choo
- Mater Research Institute, The University of Queensland, Brisbane, QLD, 4102, Australia
| | - Rahasudha Kannan
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Aysia Kinnaird
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Megan Avey
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Tatyana Teslya
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Allison Robyn Pettit
- Mater Research Institute, The University of Queensland, Brisbane, QLD, 4102, Australia
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA.
- Department of Pathology, University of Michigan, Medical School, Ann Arbor, MI, 48109, USA.
| | - Hernan Roca
- Department of Periodontics and Oral Medicine, University of Michigan, School of Dentistry, Ann Arbor, MI, 48109, USA.
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Batoon L, Hawse JR, McCauley LK, Weivoda MM, Roca H. Efferocytosis and Bone Dynamics. Curr Osteoporos Rep 2024:10.1007/s11914-024-00878-y. [PMID: 38914730 DOI: 10.1007/s11914-024-00878-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/13/2024] [Indexed: 06/26/2024]
Abstract
PURPOSE OF REVIEW This review summarizes the recently published scientific evidence regarding the role of efferocytosis in bone dynamics and skeletal health. RECENT FINDINGS Several types of efferocytes have been identified within the skeleton, with macrophages being the most extensively studied. Efferocytosis is not merely a 'clean-up' process vital for maintaining skeletal homeostasis; it also plays a crucial role in promoting resolution pathways and orchestrating bone dynamics, such as osteoblast-osteoclast coupling during bone remodeling. Impaired efferocytosis has been associated with aging-related bone loss and various skeletal pathologies, including osteoporosis, osteoarthritis, rheumatoid arthritis, and metastatic bone diseases. Accordingly, emerging evidence suggests that targeting efferocytic mechanisms has the potential to alleviate these conditions. While efferocytosis remains underexplored in the skeleton, recent discoveries have shed light on its pivotal role in bone dynamics, with important implications for skeletal health and pathology. However, there are several knowledge gaps and persisting technical limitations that must be addressed to fully unveil the contributions of efferocytosis in bone.
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Affiliation(s)
- Lena Batoon
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55905, USA.
| | - John R Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
- Department of Pathology, Medical School, University of Michigan, Ann Arbor, MI, 48104, USA
| | - Megan M Weivoda
- Division of Hematology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Hernan Roca
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA.
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3
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Chen P, Li Z, Li N. Establishment of a novel efferocytosis potential index predicts prognosis and immunotherapy response in cancers. Heliyon 2024; 10:e30337. [PMID: 38707349 PMCID: PMC11068824 DOI: 10.1016/j.heliyon.2024.e30337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 04/23/2024] [Accepted: 04/24/2024] [Indexed: 05/07/2024] Open
Abstract
The biological function and prognostic value of efferocytosis in cancer remains unclear. In this study, we systematically analysed the expression profiles and genetic variations of 50 efferocytosis-related regulator genes in 33 cancer types. Using data from The Cancer Genome Atlas, we established an efferocytosis potential index (EPI) model to represent the efferocytosis level in each cancer type. The relationship between the EPI and prognosis, immune-related molecules, specific pathways, and drug sensitivity was determined. We found that efferocytosis regulator genes were abnormally expressed in cancer tissue, perhaps owing to copy number variations, gene alterations, and DNA methylation. For the most part, the EPI was higher in tumour vs. normal tissues. In most of the 33 cancer types, it positively correlated with cell death- and immune-related pathway enrichment, the tumour microenvironment, immune infiltration, and drug sensitivity. For specific cancers, a high EPI may be a prognostic risk factor and, in patients treated receiving immune checkpoint therapy, a predictor of poor prognosis. Our study reveals the biological functions of efferocytosis-related regulator genes in distinct cancers and highlights the potential of efferocytosis intervention in cancer therapy.
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Affiliation(s)
- Peng Chen
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, 410008, Hunan Province, China
| | - Zhanzhan Li
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan Province, 410008, China
| | - Na Li
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan Province, 410008, China
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Zhu S, Cheng Q, Zou M, Li C, Tang Y, Xia L, Jiang Y, Gong Z, Tang Z, Tang Y, Luo H, Peng N, Wang X, Dong X. Combining bulk and scRNA-seq to explore the molecular mechanisms governing the distinct efferocytosis activities of a macrophage subpopulation in PDAC. J Cell Mol Med 2024; 28:e18266. [PMID: 38501838 PMCID: PMC10949604 DOI: 10.1111/jcmm.18266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 02/25/2024] [Accepted: 03/11/2024] [Indexed: 03/20/2024] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC), a very aggressive tumour, is currently the third leading cause of cancer-related deaths. Unfortunately, many patients face the issue of inoperability at the diagnostic phase leading to a quite dismal prognosis. The onset of metastatic processes has a crucial role in the elevated mortality rates linked to PDAC. Individuals with metastatic advances receive only palliative therapy and have a grim prognosis. It is essential to carefully analyse the intricacies of the metastatic process to enhance the prognosis for individuals with PDAC. Malignancy development is greatly impacted by the process of macrophage efferocytosis. Our current knowledge about the complete range of macrophage efferocytosis activities in PDAC and their intricate interactions with tumour cells is still restricted. This work aims to resolve communication gaps and pinpoint the essential transcription factor that is vital in the immunological response of macrophage populations. We analysed eight PDAC tissue samples sourced from the gene expression omnibus. We utilized several software packages such as Seurat, DoubletFinder, Harmony, Pi, GSVA, CellChat and Monocle from R software together with pySCENIC from Python, to analyse the single-cell RNA sequencing (scRNA-seq) data collected from the PDAC samples. This study involved the analysis of a comprehensive sample of 22,124 cells, which were classified into distinct cell types. These cell types encompassed endothelial and epithelial cells, PDAC cells, as well as various immune cells, including CD4+ T cells, CD8+ T cells, NK cells, B cells, plasma cells, mast cells, monocytes, DC cells and different subtypes of macrophages, namely C0 macrophage TGM2+, C1 macrophage PFN1+, C2 macrophage GAS6+ and C3 macrophage APOC3+. The differentiation between tumour cells and epithelial cells was achieved by the implementation of CopyKat analysis, resulting in the detection and categorization of 1941 PDAC cells. The amplification/deletion patterns observed in PDAC cells on many chromosomes differ significantly from those observed in epithelial cells. The study of Pseudotime Trajectories demonstrated that the C0 macrophage subtype expressing TGM2+ had the lowest level of differentiation. Additionally, the examination of gene set scores related to efferocytosis suggested that this subtype displayed higher activity during the efferocytosis process compared to other subtypes. The most active transcription factors for each macrophage subtype were identified as BACH1, NFE2, TEAD4 and ARID3A. In conclusion, the examination of human PDAC tissue samples using immunofluorescence analysis demonstrated the co-localization of CD68 and CD11b within regions exhibiting the presence of keratin (KRT) and alpha-smooth muscle actin (α-SMA). This observation implies a spatial association between macrophages, fibroblasts, and epithelial cells. There is variation in the expression of efferocytosis-associated genes between C0 macrophage TGM2+ and other macrophage cell types. This observation implies that the diversity of macrophage cells might potentially influence the metastatic advancement of PDAC. Moreover, the central transcription factor of different macrophage subtypes offers a promising opportunity for targeted immunotherapy in the treatment of PDAC.
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Affiliation(s)
- Shaoliang Zhu
- Department of Hepatobiliary, Pancreas and Spleen SurgeryThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Quan Cheng
- Department of General SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingChina
| | - Mengjie Zou
- Department of NephrologyThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Chunxing Li
- Department of Operating RoomThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Yi Tang
- Department of Hepatobiliary, Pancreas and Spleen SurgeryThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Longjie Xia
- Department of Cosmetology and Plastic Surgery CenterThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Yanming Jiang
- Department of GynecologyThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Zheng Gong
- Department of AnesthesiologyThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Zhenyong Tang
- Department of Hepatobiliary, Pancreas and Spleen SurgeryThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Yuntian Tang
- Department of Hepatobiliary, Pancreas and Spleen SurgeryThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Honglin Luo
- Institute of Oncology, The People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
| | - Ningfu Peng
- Department of Hepatobiliary SurgeryGuangxi Medical University Cancer HospitalNanningChina
| | - Xiaojing Wang
- Department of Rheumatology and Immunology, Tongren Hospital, School of MedicineShanghai Jiao Tong UniversityShanghaiChina
| | - Xiaofeng Dong
- Department of Hepatobiliary, Pancreas and Spleen SurgeryThe People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi Academy of Medical SciencesNanningChina
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Jamalvandi M, Khayyatzadeh SS, Hayati MJ, Gheibihayat SM. The role of fat-soluble vitamins in efferocytosis. Cell Biochem Funct 2024; 42:e3972. [PMID: 38500392 DOI: 10.1002/cbf.3972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/08/2024] [Accepted: 03/02/2024] [Indexed: 03/20/2024]
Abstract
Cell death and the efficient removal of dead cells are two basic mechanisms that maintain homeostasis in multicellular organisms. efferocytosis, which includes four steps recruitment, recognition, binding and signaling, and engulfment. Effectively and quickly removes apoptotic cells from the body. Any alteration in efferocytosis can lead to several diseases, including autoimmune and inflammatory conditions, atherosclerosis, and cancer. A wide range of dietary components affects apoptosis and, subsequently, efferocytosis. Some vitamins, including fat-soluble vitamins, affect different stages of efferocytosis. Among other things, by affecting macrophages, they are effective in the apoptotic cleansing of cells. Also, polyphenols indirectly intervene in efferocytosis through their effect on apoptosis. Considering that there are limited articles on the effect of nutrition on efferocytosis, in this article we will examine the effect of some dietary components on efferocytosis.
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Affiliation(s)
- Mona Jamalvandi
- Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Sayyed Saeid Khayyatzadeh
- Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Javad Hayati
- Department of Medical Biotechnology, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
| | - Seyed Mohammad Gheibihayat
- Department of Medical Biotechnology, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
- Yazd Cardiovascular Research Center, Non-communicable Diseases Research Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Mohammad-Rafiei F, Moadab F, Mahmoudi A, Navashenaq JG, Gheibihayat SM. Efferocytosis: a double-edged sword in microbial immunity. Arch Microbiol 2023; 205:370. [PMID: 37925389 DOI: 10.1007/s00203-023-03704-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 09/30/2023] [Accepted: 10/10/2023] [Indexed: 11/06/2023]
Abstract
Efferocytosis is characterized as the rapid and efficient process by which dying or dead cells are removed. This type of clearance is initiated via "find-me" signals, and then, carries on by "eat-me" and "don't-eat-me" ones. Efferocytosis has a critical role to play in tissue homeostasis and innate immunity. However, some evidence suggests it as a double-edged sword in microbial immunity. In other words, some pathogens have degraded efferocytosis by employing efferocytic mechanisms to bypass innate immune detection and promote infection, despite the function of this process for the control and clearance of pathogens. In this review, the efferocytosis mechanisms from the recognition of dying cells to phagocytic engulfment are initially presented, and then, its diverse roles in inflammation and immunity are highlighted. In this case, much focus is also laid on some bacterial, viral, and parasitic infections caused by Mycobacterium tuberculosis (M. tb), Mycobacterium marinum (M. marinum), Listeria monocytogenes (L. monocytogenes), Chlamydia pneumoniae (CP), Klebsiella pneumoniae (KP), Influenza A virus (IAV), human immunodeficiency virus (HIV), and Leishmania, respectively.
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Affiliation(s)
- Fatemeh Mohammad-Rafiei
- Department of Medical Biotechnology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Fatemeh Moadab
- Division of Rheumatology, Department of Medicine, University of Washington, Seattle, USA
| | - Ali Mahmoudi
- Department of Medical Biotechnology and Nanotechnology, Faculty of Medicine, Mashhad University of Medical Science, Mashhad, Iran
| | | | - Seyed Mohammad Gheibihayat
- Department of Medical Biotechnology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
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7
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Poznyak AV, Sukhorukov VN, Guo S, Postnov AY, Orekhov AN. Sex Differences Define the Vulnerability to Atherosclerosis. CLINICAL MEDICINE INSIGHTS-CARDIOLOGY 2023; 17:11795468231189044. [PMID: 37529084 PMCID: PMC10387777 DOI: 10.1177/11795468231189044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Accepted: 07/03/2023] [Indexed: 08/03/2023]
Abstract
For several decades, atherosclerosis has attracted the attention of researchers around the world. Even being a major cause of serious cardiovascular disease and events, atherosclerosis is still not fully understood. Despite the fact that the main players in the pathogenesis of atherosclerosis are well known, many mechanisms of their implementation and interactions remain unknown. The same can be said about the risk factors for atherosclerosis. Many of them are known, but exactly how they work remains to be seen. The main objective of this review is to summarize the latest data on sex as a biological variable in atherosclerosis in humans and animals; to determine what we do not still know about how sex affects the process of growth and complications of atherosclerosis. In this review, we summarized data on sex differences at 3 atherosclerotic aspects: inflammation, vascular remodeling, and plaque morphology. With all overviewed data, we came to the conclusion on the atheroprotective role of female sex.
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Affiliation(s)
| | - Vasiliy N Sukhorukov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Moscow, Russia
| | - Shuzhen Guo
- Diabetes Research Center, School of Traditional Chinese Medicine, Beijing University of Chinese, Beijing, China
| | - Anton Y Postnov
- Laboratory of Cellular and Molecular Pathology of Cardiovascular System, Federal State Budgetary Scientific Institution «Petrovsky National Research Centre of Surgery» (FSBSI “Petrovsky NRCS”), Moscow, Russia
| | - Alexander N Orekhov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Moscow, Russia
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Lang C, Roy S, Wang Y, Graves D, Xu Y, Serezani CH, Korrer M, Kim YJ. Efferocytosis drives myeloid NLRP3 dependent inflammasome signaling secretion of IL-1β to promote tumor growth. Front Immunol 2022; 13:993771. [PMID: 36439171 PMCID: PMC9681818 DOI: 10.3389/fimmu.2022.993771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 10/19/2022] [Indexed: 11/10/2022] Open
Abstract
Caspase-1 signaling in myeloid suppressor cells can promote T-cell independent cancer progression, but the regulation of inflammasome signaling within the highly heterogeneous myeloid population in the tumor milieu remains elusive. To resolve this complexity, single cell transcriptomic profile of Head and Neck Squamous Cell Carcinoma (HNSCC) identified distinct inflammasome-associated genes within specific clusters of tumor-infiltrating myeloid cells. Among these myeloid cells, the sensor protein, NLRP3, and downstream effector IL-1β transcripts were enriched in discreet monocytic and macrophage subtypes in the TME. We showed that deletion of NLRP3, but not AIM2, phenocopied caspase-1/IL-1β dependent tumor progression in vivo. Paradoxically, we found myeloid-intrinsic caspase-1 signaling increased myeloid survival contrary to what would be predicted from the canonical pyroptotic function of caspase-1. This myeloid NLRP3/IL-1β signaling axis promotion of tumor growth was found to be gasdermin D independent. Mechanistically, we found that phagocyte-mediated efferocytosis of dying tumor cells in the TME directly activated NLRP3-dependent inflammasome signaling to drive IL-1β secretion. Subsequently we showed that NLRP3-mediated IL-1β production drives tumor growth in vivo. Dynamic RNA velocity analysis showed a robust directional flow from efferocytosis gene-set high macrophages to an inflammasome gene-set high macrophage population. We provide a novel efferocytosis-dependent inflammasome signaling pathway which mediates homeostatic tumor cell apoptosis that characterizes chronic inflammation-induced malignancy.
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Affiliation(s)
- Cara Lang
- Department of Pathology, Microbiology & Immunology, Vanderbilt University, Nashville, TN, United States
| | - Sohini Roy
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Yu Wang
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, United States
- Center for Quantitative Sciences, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Diana Graves
- Department of Pathology, Microbiology & Immunology, Vanderbilt University, Nashville, TN, United States
| | - Yaomin Xu
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, United States
- Center for Quantitative Sciences, Vanderbilt University Medical Center, Nashville, TN, United States
| | - C. Henrique Serezani
- Vanderbilt Center for Immunobiology, Vanderbilt University Medical Center, Nashville, TN, United States
- Department of Medicine, Division of Infectious Diseases, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Michael Korrer
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Young J. Kim
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, TN, United States
- Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, United States
- *Correspondence: Young J. Kim,
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Wei YT, Wang XR, Yan C, Huang F, Zhang Y, Liu X, Wen ZF, Sun XT, Zhang Y, Chen YQ, Gao R, Pan N, Wang LX. Thymosin α-1 reverses M2 polarization of tumor-associated macrophages during efferocytosis. Cancer Res 2022; 82:1991-2002. [PMID: 35364609 DOI: 10.1158/0008-5472.can-21-4260] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/24/2022] [Accepted: 03/30/2022] [Indexed: 11/16/2022]
Abstract
The immunological effects of chemotherapy-induced tumor cell death are not completely understood. Accumulating evidence suggests that phagocytic clearance of apoptotic tumor cells, also known as efferocytosis, is an immunologically silent process, thus maintaining an immunosuppressive tumor microenvironment (TME). Here we report that, in the breast tumor microenvironment, thymosin α-1 (Tα-1) significantly reverses M2 polarization of IL-10-producing tumor-associated macrophages (TAM) during efferocytosis induced by apoptotic cells. Mechanistically, Tα-1, which bound to phosphatidylserine on the surface of apoptotic tumor cells and was internalized by macrophages, triggered the activation of SH2-containing inositol 5'-phosphatase 1 (SHIP1) through the lysosomal toll-like receptor 7 (TLR7)/MyD88 pathway, subsequently resulting in dephosphorylation of efferocytosis-activated TBK1 and reduction of efferocytosis-induced IL-10. Tα-1 combined with epirubicin chemotherapy markedly suppressed tumor growth in an in vivo breast cancer model by reducing macrophage-derived IL-10 and enhancing the number and function of tumor-infiltrating CD4+ and CD8+ T cells. In conclusion, Tα-1 improved the curative effect of chemotherapy by reversing M2 polarization of efferocytosis-activated macrophages, suggesting that Tα-1 injection immediately after chemotherapy may contribute to highly synergistic anti-tumor effects in breast cancer patients.
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Affiliation(s)
- Yi-Ting Wei
- Medical School of Southeast University, Nanjing, China
| | - Xu-Ru Wang
- Medical School of Southeast University, Nanjing, China
| | - Chunguang Yan
- Medical School of Southeast University, Nanjing, China
| | - Fang Huang
- Medical School of Southeast University, Nanjing, China
| | | | - Xueming Liu
- Medical School of Southeast University, Nanjing, China
| | - Zhi-Fa Wen
- Medical School of Southeast University, Nanjing, China
| | - Xiao-Tong Sun
- Medical School of Southeast University, Nanjing, China
| | - Yue Zhang
- Medical School of Southeast University, Nanjing, China
| | | | - Rong Gao
- Medical School of Southeast University, Nanjing, China
| | - Ning Pan
- Medical School of Southeast University, Nanjing, China
| | - Li-Xin Wang
- Medical School of Southeast University, Nanjing, China
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10
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Su W, Liang L, Zhou L, Cao Y, Zhou X, Liu S, Wang Q, Zhang H. Macrophage Paired Immunoglobulin-Like Receptor B Deficiency Promotes Peripheral Atherosclerosis in Apolipoprotein E–Deficient Mice. Front Cell Dev Biol 2022; 9:783954. [PMID: 35321392 PMCID: PMC8936951 DOI: 10.3389/fcell.2021.783954] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 12/13/2021] [Indexed: 01/08/2023] Open
Abstract
Background: Peripheral atherosclerotic disease (PAD) is the narrowing or blockage of arteries that supply blood to the lower limbs. Given its complex nature, bioinformatics can help identify crucial genes involved in the progression of peripheral atherosclerosis. Materials and Methods: Raw human gene expression data for 462 PAD arterial plaque and 23 normal arterial samples were obtained from the GEO database. The data was analyzed using an integrated, multi-layer approach involving differentially-expressed gene analysis, KEGG pathway analysis, GO term enrichment analysis, weighted gene correlation network analysis, and protein-protein interaction analysis. The monocyte/macrophage-expressed leukocyte immunoglobulin-like receptor B2 (LILRB2) was strongly associated with the human PAD phenotype. To explore the role of the murine LILRB2 homologue PirB in vivo, we created a myeloid-specific PirB-knockout Apoe−/− murine model of PAD (PirBMΦKO) to analyze femoral atherosclerotic burden, plaque features of vulnerability, and monocyte recruitment to femoral atherosclerotic lesions. The phenotypes of PirBMΦKO macrophages under various stimuli were also investigated in vitro. Results:PirBMΦKO mice displayed increased femoral atherogenesis, a more vulnerable plaque phenotype, and enhanced monocyte recruitment into lesions. PirBMΦKO macrophages showed enhanced pro-inflammatory responses and a shift toward M1 over M2 polarization under interferon-γ and oxidized LDL exposure. PirBMΦKO macrophages also displayed enhanced efferocytosis and reduced lipid efflux under lipid exposure. Conclusion: Macrophage PirB reduces peripheral atherosclerotic burden, stabilizes peripheral plaque composition, and suppresses macrophage accumulation in peripheral lesions. Macrophage PirB inhibits pro-inflammatory activation, inhibits efferocytosis, and promotes lipid efflux, characteristics critical to suppressing peripheral atherogenesis.
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Affiliation(s)
- Wenhua Su
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
- Faculty of Life Science and Biotechnology, Kunming University of Science and Technology, Kunming, China
| | - Liwen Liang
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
| | - Liang Zhou
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
| | - Yu Cao
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
- Department of Cardiovascular Surgery, First People’s Hospital of Yunnan Province, Kunming, China
| | - Xiuli Zhou
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
| | - Shiqi Liu
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
| | - Qian Wang
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
| | - Hong Zhang
- Department of Cardiology, First People’s Hospital of Yunnan Province, Kunming, China
- *Correspondence: Hong Zhang,
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Cabrera JTO, Makino A. Efferocytosis of vascular cells in cardiovascular disease. Pharmacol Ther 2022; 229:107919. [PMID: 34171333 PMCID: PMC8695637 DOI: 10.1016/j.pharmthera.2021.107919] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/21/2021] [Accepted: 06/03/2021] [Indexed: 12/20/2022]
Abstract
Cell death and the clearance of apoptotic cells are tightly regulated by various signaling molecules in order to maintain physiological tissue function and homeostasis. The phagocytic removal of apoptotic cells is known as the process of efferocytosis, and abnormal efferocytosis is linked to various health complications and diseases, such as cardiovascular disease, inflammatory diseases, and autoimmune diseases. During efferocytosis, phagocytic cells and/or apoptotic cells release signals, such as "find me" and "eat me" signals, to stimulate the phagocytic engulfment of apoptotic cells. Primary phagocytic cells are macrophages and dendritic cells; however, more recently, other neighboring cell types have also been shown to exhibit phagocytic character, including endothelial cells and fibroblasts, although they are comparatively slower in clearing dead cells. In this review, we focus on macrophage efferocytosis of vascular cells, such as endothelial cells, smooth muscle cells, fibroblasts, and pericytes, and its relation to the progression and development of cardiovascular disease. We also highlight the role of efferocytosis-related molecules and their contribution to the maintenance of vascular homeostasis.
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Affiliation(s)
- Jody Tori O Cabrera
- Division of Endocrinology and Metabolism, Department of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Ayako Makino
- Division of Endocrinology and Metabolism, Department of Medicine, University of California, San Diego, La Jolla, CA, USA.
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12
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Efferocytosis and the Story of "Find Me," "Eat Me," and "Don't Eat Me" Signaling in the Tumor Microenvironment. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021. [PMID: 34664238 DOI: 10.1007/978-3-030-73119-9_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
The process of efferocytosis involves removal of dying or dead cells by phagocytosis. Another term "efferosome" is used which means a fluid-filled membrane vesicle which engulfs dead cells. The process of efferocytosis works in coordination with apoptosis because before the contents of apoptotic cells are bleached out, they are engulfed by efferosomes. Thus, the microenvironment is not polluted with toxic enzymes and oxidants. A defect in the apoptotic cell clearance may participate in autoimmunity and chronic inflammation for homeostasis and proper tissue development, for which removal of dead cells is essential. This also protects from chronic inflammation and autoimmunity. In different tumor types and other diseases, efferocytosis has been studied extensively and potential pathways identified. A few of the intermediates in different pathways, which create aggressive and tolerogenic tumor microenvironment, might be considered for therapeutic or interventional purposes. Since the key players in efferocytosis are macrophages and dendritic cells, development of antigen-dependent antitumor immunity is affected by efferocytosis. The literature analysis suggests that efferocytosis is an underappreciated immune checkpoint, perhaps one that might be therapeutically targeted in the setting of cancer. The current status of efferocytosis and its role in tumor microenvironment is discussed in this article.
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13
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Driving regeneration, instead of healing, in adult mammals: the decisive role of resident macrophages through efferocytosis. NPJ Regen Med 2021; 6:41. [PMID: 34344890 PMCID: PMC8333253 DOI: 10.1038/s41536-021-00151-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 07/07/2021] [Indexed: 12/19/2022] Open
Abstract
Tissue repair after lesion usually leads to scar healing and thus loss of function in adult mammals. In contrast, other adult vertebrates such as amphibians have the ability to regenerate and restore tissue homeostasis after lesion. Understanding the control of the repair outcome is thus a concerning challenge for regenerative medicine. We recently developed a model of induced tissue regeneration in adult mice allowing the comparison of the early steps of regenerative and scar healing processes. By using studies of gain and loss of function, specific cell depletion approaches, and hematopoietic chimeras we demonstrate here that tissue regeneration in adult mammals depends on an early and transient peak of granulocyte producing reactive oxygen species and an efficient efferocytosis specifically by tissue-resident macrophages. These findings highlight key and early cellular pathways able to drive tissue repair towards regeneration in adult mammals.
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14
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Mota AC, Dominguez M, Weigert A, Snodgrass RG, Namgaladze D, Brüne B. Lysosome-Dependent LXR and PPARδ Activation Upon Efferocytosis in Human Macrophages. Front Immunol 2021; 12:637778. [PMID: 34025647 PMCID: PMC8137840 DOI: 10.3389/fimmu.2021.637778] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 04/23/2021] [Indexed: 01/01/2023] Open
Abstract
Efferocytosis is critical for tissue homeostasis, as its deregulation is associated with several autoimmune pathologies. While engulfing apoptotic cells, phagocytes activate transcription factors, such as peroxisome proliferator-activated receptors (PPAR) or liver X receptors (LXR) that orchestrate metabolic, phagocytic, and inflammatory responses towards the ingested material. Coordination of these transcription factors in efferocytotic human macrophages is not fully understood. In this study, we evaluated the transcriptional profile of macrophages following the uptake of apoptotic Jurkat T cells using RNA-seq analysis. Results indicated upregulation of PPAR and LXR pathways but downregulation of sterol regulatory element-binding proteins (SREBP) target genes. Pharmacological inhibition and RNA interference pointed to LXR and PPARδ as relevant transcriptional regulators, while PPARγ did not substantially contribute to gene regulation. Mechanistically, lysosomal digestion and lysosomal acid lipase (LIPA) were required for PPAR and LXR activation, while PPARδ activation also demanded an active lysosomal phospholipase A2 (PLA2G15). Pharmacological interference with LXR signaling attenuated ABCA1-dependent cholesterol efflux from efferocytotic macrophages, but suppression of inflammatory responses following efferocytosis occurred independently of LXR and PPARδ. These data provide mechanistic details on LXR and PPARδ activation in efferocytotic human macrophages.
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Affiliation(s)
- Ana Carolina Mota
- Institute of Biochemistry I, Faculty of Medicine, Goethe-University Frankfurt, Frankfurt, Germany
| | - Monica Dominguez
- Institute of Biochemistry I, Faculty of Medicine, Goethe-University Frankfurt, Frankfurt, Germany
| | - Andreas Weigert
- Institute of Biochemistry I, Faculty of Medicine, Goethe-University Frankfurt, Frankfurt, Germany
| | - Ryan G Snodgrass
- Institute of Biochemistry I, Faculty of Medicine, Goethe-University Frankfurt, Frankfurt, Germany
| | - Dmitry Namgaladze
- Institute of Biochemistry I, Faculty of Medicine, Goethe-University Frankfurt, Frankfurt, Germany
| | - Bernhard Brüne
- Institute of Biochemistry I, Faculty of Medicine, Goethe-University Frankfurt, Frankfurt, Germany.,Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Frankfurt, Germany.,German Cancer Consortium (DKTK), Partner Site Frankfurt, Frankfurt, Germany.,Frankfurt Cancer Institute, Goethe-University Frankfurt, Frankfurt, Germany
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15
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Felix FB, Vago JP, Fernandes DDO, Martins DG, Moreira IZ, Gonçalves WA, Costa WC, Araújo JMD, Queiroz-Junior CM, Campolina-Silva GH, Soriani FM, Sousa LP, Grespan R, Teixeira MM, Pinho V. Biochanin A Regulates Key Steps of Inflammation Resolution in a Model of Antigen-Induced Arthritis via GPR30/PKA-Dependent Mechanism. Front Pharmacol 2021; 12:662308. [PMID: 33995086 PMCID: PMC8114065 DOI: 10.3389/fphar.2021.662308] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 03/29/2021] [Indexed: 12/12/2022] Open
Abstract
Biochanin A (BCA) is a natural organic compound of the class of phytochemicals known as flavonoids and isoflavone subclass predominantly found in red clover (Trifolium pratense). It has anti-inflammatory activity and some pro-resolving actions, such as neutrophil apoptosis. However, the effect of BCA in the resolution of inflammation is still poorly understood. In this study, we investigated the effects of BCA on the neutrophilic inflammatory response and its resolution in a model of antigen-induced arthritis. Male wild-type BALB/c mice were treated with BCA at the peak of the inflammatory process (12 h). BCA decreased the accumulation of migrated neutrophils, and this effect was associated with reduction of myeloperoxidase activity, IL-1β and CXCL1 levels, and the histological score in periarticular tissues. Joint dysfunction, as seen by mechanical hypernociception, was improved by treatment with BCA. The resolution interval (Ri) was also quantified, defining profiles of acute inflammatory parameters that include the amplitude and duration of the inflammatory response monitored by the neutrophil infiltration. BCA treatment shortened Ri from ∼23 h observed in vehicle-treated mice to ∼5.5 h, associated with an increase in apoptotic events and efferocytosis, both key steps for the resolution of inflammation. These effects of BCA were prevented by H89, an inhibitor of protein kinase A (PKA) and G15, a selective G protein–coupled receptor 30 (GPR30) antagonist. In line with the in vivo data, BCA also increased the efferocytic ability of murine bone marrow–derived macrophages. Collectively, these data indicate for the first time that BCA resolves neutrophilic inflammation acting in key steps of the resolution of inflammation, requiring activation of GPR30 and via stimulation of cAMP-dependent signaling.
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Affiliation(s)
- Franciel Batista Felix
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Juliana Priscila Vago
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Débora de Oliveira Fernandes
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Débora Gonzaga Martins
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Isabella Zaidan Moreira
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - William Antonio Gonçalves
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Walyson Coelho Costa
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | | | - Celso Martins Queiroz-Junior
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | | | - Frederico Marianetti Soriani
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Lirlândia Pires Sousa
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Renata Grespan
- Departamento de Fisiologia, Universidade Federal de Sergipe, São Cristovão, Brazil
| | - Mauro Martins Teixeira
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Vanessa Pinho
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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16
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Felix JC, Sheinin YM, Suster D, Ronen N, Ratiani M, Vanden Heuvel T, Winge E, Patton MD, Rau MJ, Ge L, Sun Y, Udhane SS, Langenheim JF, Rui H. Diffuse interstitial pneumonia-like/macrophage activation syndrome-like changes in patients with COVID-19 correlate with length of illness. Ann Diagn Pathol 2021; 53:151744. [PMID: 33991784 PMCID: PMC8053602 DOI: 10.1016/j.anndiagpath.2021.151744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 04/14/2021] [Indexed: 01/21/2023]
Abstract
OBJECTIVES Assess the pathologic changes in the lungs of COVID-19 decedents and correlate these changes with demographic data, clinical course, therapies, and duration of illness. METHODS Lungs of 12 consecutive COVID-19 decedents consented for autopsy were evaluated for gross and histopathologic abnormalities. A complete Ghon "en block" dissection was performed on all cases; lung weights and gross characteristics recorded. Immunohistochemical studies were performed to characterize lymphocytic infiltrates and to assess SARS-CoV-2 capsid protein. RESULTS Two distinct patterns of pulmonary involvement were identified. Three of 12 cases demonstrated a predominance of acute alveolar damage (DAD) while 9 of 12 cases demonstrated a marked increase in intra-alveolar macrophages in a fashion resembling desquamative interstitial pneumonia or macrophage activation syndrome (DIP/MAS). Two patterns were correlated solely with a statistically significant difference in the duration of illness. The group exhibiting DAD had duration of illness of 5.7 days while the group with DIP/MAS had duration of illness of 21.5 days (t-test p = 0.014). CONCLUSIONS The pulmonary pathology of COVID-19 patients demonstrates a biphasic pattern, an acute phase demonstrating DAD changes while the patients with a more prolonged course exhibit a different pattern that resembles DIP/MAS-like pattern. The potential mechanisms and clinical significance are discussed.
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Affiliation(s)
- Juan C Felix
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Yuri M Sheinin
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - David Suster
- Rutgers University Medical School, 185 South Orange Avenue, Newark, NJ 07103, United States of America
| | - Natali Ronen
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Mariam Ratiani
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Tana Vanden Heuvel
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Emilie Winge
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Mollie D Patton
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Mary J Rau
- Department of Pathology, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, United States of America.
| | - Linna Ge
- Department of Pathology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, United States of America.
| | - Yunguang Sun
- Department of Pathology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, United States of America.
| | - Sameer S Udhane
- Department of Pathology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, United States of America.
| | - John F Langenheim
- Department of Pathology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, United States of America.
| | - Hallgeir Rui
- Department of Pathology, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, United States of America.
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Gadiyar V, Patel G, Davra V. Immunological role of TAM receptors in the cancer microenvironment. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 357:57-79. [PMID: 33234245 DOI: 10.1016/bs.ircmb.2020.09.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
TAM receptors belong to the family of receptor tyrosine kinases, comprising of Tyro3, Axl and Mertk receptors (TAMs) and are important homeostatic regulators of inflammation in higher eukaryotes. Along with their ligands, Gas6 and ProteinS, TAMs acts as receptors to phosphatidylserine (PtdSer), an anionic phospholipid that becomes externalized on the surface of apoptotic and stressed cells. TAM receptors, specially Mertk, have been well established to play a role in the process of efferocytosis, the engulfment of dying cells. Besides being efferocytic receptors, TAMs are pleiotropic immune modulators as the lack of TAM receptors in various mouse models lead to chronic inflammation and autoimmunity. Owing to their immune modulatory role, the PtdSer-TAM receptor signaling axis has been well characterized as a global immune-suppressive signal, and in cancers, and emerging literature implicates TAM receptors in cancer immunology and anti-tumor therapeutics. In the tumor microenvironment, immune-suppressive signals, such as ones that originate from TAM receptor signaling can be detrimental to anti-tumor therapy. In this chapter, we discuss immune modulatory functions of TAM receptors in the tumor microenvironment as well role of differentially expressed TAM receptors and their interactions with immune and tumor cells. Finally, we describe current strategies being utilized for targeting TAMs in several cancers and their implications in immunotherapy.
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Affiliation(s)
- Varsha Gadiyar
- Rutgers New Jersey Medical School, Newark, NJ, United States
| | - Gopi Patel
- Rutgers New Jersey Medical School, Newark, NJ, United States
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