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Zhao R, Liao W, Tan D, Huang H, Hu C, Chen M. Comparative analysis of the expression patterns of TM9SF family members in mice. Gene Expr Patterns 2024; 52:119366. [PMID: 38719197 DOI: 10.1016/j.gep.2024.119366] [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: 11/23/2023] [Revised: 03/05/2024] [Accepted: 05/05/2024] [Indexed: 05/19/2024]
Abstract
Transmembrane 9 superfamily proteins (TM9SFs) define a highly conserved protein family, each member of which is characterized by a variable extracellular domain and presumably nine transmembrane domains. Although previous studies have delineated the potential cytological roles of TM9SFs like autophagy and secretory pathway, their functions during development are largely unknown. To establish the basis for dissecting the functions of TM9SFs in vivo, we employed the open-source database, structure prediction, immunofluorescence and Western blot to describe the gene and protein expression patterns of TM9SFs in human and mouse. While TM9SFs are ubiquitously and homogeneously expressed in all tissues in human with RNA sequencing and proteomics analysis, we found that all mice Tm9sf proteins are preferentially expressed in lung except Tm9sf1 which is enriched in brain although they all distributed in various tissues we examined. In addition, we further explored their expression patterns in the mice central nervous system (CNS) and its extension tissue retina. Interestingly, we could show that Tm9sf1is developmentally up-regulated in brain. In addition, we also detected all Tm9sf proteins are located in neurons and microglia instead of astrocytes. Importantly, Tm9sf3 is localized in the nuclei which is distinct from the other members that are dominantly targeted to the plasma membrane/cytoplasm as expected. Finally, we also found that Tm9sf family members are broadly expressed in the layers of INL, OPL, and GCL of retina and likely targeted to the plasma membrane of retinal cells. Thus, our data provided a comprehensive overview of TM9SFs expression patterns, illustrating their ubiquitous roles in different organs, implying the possible roles of Tm9sf2/3/4 in lung functions and Tm9sf1 in neurodevelopment, and highlighting a unique cell biological functions of TM9SF3 in neuronal and microglia.
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Affiliation(s)
- Rui Zhao
- Guangdong Second Provincial General Hospital, Guangzhou, 510317, China; Key Laboratory of Brain, Cognition and Education Sciences, Ministry of Education, China; Institute for Brain Research and Rehabilitation, South China Normal University, 510631, Guangzhou, China
| | - Wenxiong Liao
- Guangdong Second Provincial General Hospital, Guangzhou, 510317, China
| | - Duo Tan
- Guangdong Second Provincial General Hospital, Guangzhou, 510317, China
| | - Haiyou Huang
- Jianghai Street Community Health Service Center, Haizhu District, Guangzhou, Guangzhou, 510305, China
| | - Chun Hu
- Key Laboratory of Brain, Cognition and Education Sciences, Ministry of Education, China; Institute for Brain Research and Rehabilitation, South China Normal University, 510631, Guangzhou, China
| | - Meilan Chen
- Guangdong Second Provincial General Hospital, Guangzhou, 510317, China.
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Zhang X, Liu J, Ji M, Qi G, Qiao R. Long Noncoding RNA GUSBP11 Knockdown Alleviates Nasopharyngeal Carcinoma via Regulating miR-1226-3p/ TM9SF4 Axis. Cancer Biother Radiopharm 2024; 39:133-143. [PMID: 35675666 DOI: 10.1089/cbr.2021.0391] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Purpose: Long noncoding RNAs (lncRNAs) have been confirmed related to the occurrence and progress of multiple cancers, including cervical cancer nasopharyngeal carcinoma (NPC). This study focused on assessing GUSBP11 effects on NPC progression and exploring possible mechanisms. Materials and Methods: RT-qPCR was conducted for assessing GUSBP11 levels within NPC tissues and cells. CCK-8, colony formation, and Transwell were adopted for examining GUSBP11 impacts on NPC cell proliferation and cell metastasis. RT-qPCR analysis and dual-luciferase reporter assay were conducted for judging the expression interrelation of GUSBP11 and its potential target miR-1226-3p. The same methods were carried out for verifying the inhibiting influences of miR-1226-3p upregulation and its potential target TM9SF4. Results: GUSBP11 levels were upregulated within NPC tissues and cells. GUSBP11 downregulation repressed NPC cell proliferation and cell metastasis. In addition, GUSBP11 targeted and negatively regulated miR-1226-3p. Furthermore, miR-1226-3p targeted TM9SF4 and mediated GUSBP11's impacts on TM9SF4 levels. At last, the authors proved the critical role of the GUSBP11/miR-1226-3p/TM9SF4 axis in regulating NPC progression. Conclusion: These findings indicate that downregulation of GUSBP11 alleviates NPC development by regulating the miR-1226-3p/TM9SF4 axis.
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Affiliation(s)
- Xiaofeng Zhang
- Department of Otolaryngology, Head and Neck Surgery, Weihai Maternal and Child Health Hospital, Affiliated Weihai Hospital of Qingdao University, Weihai, China
| | - Jinzhi Liu
- Department of the First Internal Medicine, Dongying District People's Hospital, Dongying, China
| | - MengMeng Ji
- Blood Purifying Center, Affiliated Qingdao Central Hospital of Qingdao University, Qingdao, China
| | - GuiQin Qi
- Department of Outpatient, The Second Affiliated Hospital of Shandong First Medical University, Taian, China
| | - Renling Qiao
- Department of Otolaryngology, Laiyang Central Hospital, Yantai, China
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3
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Zheng S, Li Y, Yin L, Lu M. Identification of sulfur metabolism-related gene signature in osteoarthritis and TM9SF2's sustenance effect on M2 macrophages' phagocytic activity. J Orthop Surg Res 2024; 19:62. [PMID: 38218914 PMCID: PMC10787471 DOI: 10.1186/s13018-023-04384-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 11/18/2023] [Indexed: 01/15/2024] Open
Abstract
BACKGROUND Osteoarthritis (OA) is a chronic and low-grade inflammatory disease associated with metabolism disorder and multiple cell death types in the synovial tissues. Sulfur metabolism has not been studied in OA. METHODS First, we calculated the single sample gene set enrichment analysis score of sulfur metabolism-associated annotations (i.e., cysteine metabolism process, regulation of sulfur metabolism process, and disulfidptosis) between healthy and synovial samples from patients with OA. Sulfur metabolism-related differentially expressed genes (DEGs) were analyzed in OA. Least absolute shrinkage and selection operator COX regression were used to identify the sulfur metabolism-associated gene signature for diagnosing OA. Correlation and immune cell deconvolution analyses were used to explore the correlated functions and cell specificity of the signature gene, TM9SF2. TM9SF2's effect on the phagocytosis of macrophages M2 was analyzed by coculturing macrophages with IgG-coated beads or apoptotic Jurkat cells. RESULTS A diagnostic six gene signature (i.e., MTHFD1, PDK4, TM9SF2, POU4F1, HOXA2, NCKAP1) was identified based on the ten DEGs, validated using GSE12021 and GSE1919 datasets. TM9SF2 was upregulated in the synovial tissues of OA at both mRNA and protein levels. The relationship between TM9SF2 and several functional annotations, such as antigen processing and presentation, lysosome, phagosome, Fcγ-mediated phagocytosis, and tyrosine metabolism, was identified. TM9SF2 and macrophages M2 were significantly correlated. After silencing TM9SF2 in THP-1-derived macrophages M2, a significantly reduced phagocytosis and attenuated activation of PLC-γ1 were observed. CONCLUSION A sulfur metabolism-associated six-gene signature for OA diagnosis was constructed and upregulation of the phagocytosis-associated gene, TM9SF2, was identified. The findings are expected to deepen our understanding of the molecular mechanism underlying OA development and be used as potential therapeutic targets.
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Affiliation(s)
- Shuang Zheng
- Department of Rheumatology, The First Affiliated Hospital of Anhui Medical University, No.218 Ji Xi Road, Hefei, 230032, Anhui, China.
| | - Yetian Li
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, No.218 Ji Xi Road, Hefei, 230032, Anhui, China
| | - Li Yin
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, No.218 Ji Xi Road, Hefei, 230032, Anhui, China
| | - Ming Lu
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, No.218 Ji Xi Road, Hefei, 230032, Anhui, China.
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Meng Z, Li Z, Xie M, Yu H, Jiang L, Yao X. TM9SF4 is an F-actin disassembly factor that promotes tumor progression and metastasis. Nat Commun 2022; 13:5728. [PMID: 36175399 PMCID: PMC9522921 DOI: 10.1038/s41467-022-33276-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 09/09/2022] [Indexed: 11/29/2022] Open
Abstract
F-actin dynamics is crucial for many fundamental properties of cancer cells, from cell-substrate adhesion to migration, invasion and metastasis. However, the regulatory mechanisms of actin dynamics are still incompletely understood. In this study, we demonstrate the function of a protein named TM9SF4 in regulating actin dynamics and controlling cancer cell motility and metastasis. We show that an N-terminal fragment (NTF) cleaved from TM9SF4 can directly bind to F-actin to induce actin oxidation at Cys374, consequently enhancing cofilin-mediated F-actin disassembly. Knockdown of TM9SF4 reduces cell migration and invasion in ovarian cancer cells A2780, SKOV3 and several high grade serous ovarian cancer lines (HGSOCs). In vivo, knockdown of TM9SF4 completely abolishes the tumor growth and metastasis in athymic nude mice. These data provide mechanistic insights into TM9SF4-mediated regulation of actin dynamics in ovarian cancer cells. F-actin dynamics influence cancer cell motility. Here the authors show that TM9SF4 facilitates the cofilin-induced disassembly of F-actin to promote cancer cell migration and metastasis.
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Affiliation(s)
- Zhaoyue Meng
- School of Biomedical Sciences and Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.,Centre for Cell & Developmental Biology and State Key Laboratory of Agrobiotechnology, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Zhichao Li
- School of Biomedical Sciences and Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.,Key Laboratory of Medical Reprogramming Technology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Mingxu Xie
- School of Biomedical Sciences and Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Hongyan Yu
- School of Biomedical Sciences and Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Liwen Jiang
- Centre for Cell & Developmental Biology and State Key Laboratory of Agrobiotechnology, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
| | - Xiaoqiang Yao
- School of Biomedical Sciences and Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China. .,Centre for Cell & Developmental Biology and State Key Laboratory of Agrobiotechnology, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
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CircCEMIP promotes anoikis-resistance by enhancing protective autophagy in prostate cancer cells. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2022; 41:188. [PMID: 35655258 PMCID: PMC9161511 DOI: 10.1186/s13046-022-02381-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 05/04/2022] [Indexed: 02/04/2023]
Abstract
Background Circular RNAs (circRNAs) are essential participants in the development and progression of various malignant tumors. Previous studies have shown that cell migration-inducing protein (CEMIP) accelerates prostate cancer (PCa) anoikis resistance (AR) by activating autophagy. This study focused on the effect of circCEMIP on PCa metastasis. Methods This study gradually revealed the role of circ_0004585 in PCa anoikis resistance via quantitative real-time PCR (qRT-PCR) analysis, western blotting, pull-down assays, and dual fluorescence reporter assays. Results Functionally, circ_0004585 promoted PCa cells invasion and metastasis both in vitro and in vivo. Mechanistically, circ_0004585 directly interacted with miR-1248 to upregulate target gene expression. Furthermore, target prediction and dual-luciferase reporter assays identified transmembrane 9 superfamily member 4 (TM9SF4) as a potential miR-1248 target. Pathway analysis revealed that TM9SF4 activated autophagy to promote PCa cells anoikis resistance via mTOR phosphorylation. Conclusions These results demonstrated that circ_0004585 played an oncogenic role during PCa invasion and metastasis by targeting the miR-1248/TM9SF4 axis while providing new insight into therapeutic strategy development for metastatic PCa. Supplementary Information The online version contains supplementary material available at 10.1186/s13046-022-02381-7.
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TM9SF4 Is a Crucial Regulator of Inflammation and ER Stress in Inflammatory Bowel Disease. Cell Mol Gastroenterol Hepatol 2022; 14:245-270. [PMID: 35398597 PMCID: PMC9218505 DOI: 10.1016/j.jcmgh.2022.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 04/03/2022] [Accepted: 04/04/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Inflammatory bowel disease (IBD) is a major intestinal disease. Excessive inflammation and increased endoplasmic reticulum (ER) stress are the key events in the development of IBD. Search of a genome-wide association study database identified a remarkable correlation between a TM9SF4 single-nucleotide polymorphism and IBD. Here, we aimed to resolve its underlying mechanism. METHODS The role of TM9SF4 was determined with experimental mouse models of IBD. ER stress cascades, barrier functions, and macrophage polarization in colonic tissues and cells were assessed in vivo and in vitro. The expression of TM9SF4 was compared between inflamed regions of ulcerative colitis patients and normal colon samples. RESULTS In mouse models of IBD, genetic knockout of the TM9SF4 gene aggravated the disease symptoms. In colonic epithelial cells, short hairpin RNA-mediated knockdown of TM9SF4 expression promoted inflammation and increased ER stress. In macrophages, TM9SF4 knockdown promoted M1 macrophage polarization but suppressed M2 macrophage polarization. Genetic knockout/knockdown of TM9SF4 also disrupted epithelial barrier function. Mechanistically, TM9SF4 deficiency may act through Ca2+ store depletion and cytosolic acidification to induce an ER stress increase. Furthermore, the expression level of TM9SF4 was found to be much lower in the inflamed colon regions of human ulcerative colitis patients than in normal colon samples. CONCLUSIONS Our study identified a novel IBD-associated protein, TM9SF4, the reduced expression of which can aggravate intestinal inflammation. Deficiency of TM9SF4 increases ER stress, promotes inflammation, and impairs the intestinal epithelial barrier to aggravate IBD.
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Sensing microbial infections in the Drosophila melanogaster genetic model organism. Immunogenetics 2022; 74:35-62. [DOI: 10.1007/s00251-021-01239-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 11/20/2021] [Indexed: 12/17/2022]
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8
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Qiu X, Hua X, Li Q, Zhou Q, Chen J. m 6A Regulator-Mediated Methylation Modification Patterns and Characteristics of Immunity in Blood Leukocytes of COVID-19 Patients. Front Immunol 2021; 12:774776. [PMID: 34917088 PMCID: PMC8669770 DOI: 10.3389/fimmu.2021.774776] [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: 09/13/2021] [Accepted: 11/08/2021] [Indexed: 12/28/2022] Open
Abstract
Both RNA N6-methyladenosine (m6A) modification of SARS-CoV-2 and immune characteristics of the human body have been reported to play an important role in COVID-19, but how the m6A methylation modification of leukocytes responds to the virus infection remains unknown. Based on the RNA-seq of 126 samples from the GEO database, we disclosed that there is a remarkably higher m6A modification level of blood leukocytes in patients with COVID-19 compared to patients without COVID-19, and this difference was related to CD4+ T cells. Two clusters were identified by unsupervised clustering, m6A cluster A characterized by T cell activation had a higher prognosis than m6A cluster B. Elevated metabolism level, blockage of the immune checkpoint, and lower level of m6A score were observed in m6A cluster B. A protective model was constructed based on nine selected genes and it exhibited an excellent predictive value in COVID-19. Further analysis revealed that the protective score was positively correlated to HFD45 and ventilator-free days, while negatively correlated to SOFA score, APACHE-II score, and crp. Our works systematically depicted a complicated correlation between m6A methylation modification and host lymphocytes in patients infected with SARS-CoV-2 and provided a well-performing model to predict the patients' outcomes.
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Affiliation(s)
- Xiangmin Qiu
- The Ministry of Education Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, China
| | - Xiaoliang Hua
- Department of Urology, The First Affiliated Hospital of Anhui Medical University, Hefei, China.,Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, China
| | - Qianyin Li
- The Ministry of Education Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, China
| | - Qin Zhou
- The Ministry of Education Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, China
| | - Juan Chen
- The Ministry of Education Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, China
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Yu L, Xie M, Zhang F, Wan C, Yao X. TM9SF4 is a novel regulator in lineage commitment of bone marrow mesenchymal stem cells to either osteoblasts or adipocytes. Stem Cell Res Ther 2021; 12:573. [PMID: 34774100 PMCID: PMC8590266 DOI: 10.1186/s13287-021-02636-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 10/25/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Osteoporosis is a common bone disease in elderly population caused by imbalanced bone formation and bone resorption. Mesenchymal stem cells (MSCs) are responsible for maintaining this bone homeostasis. The phenotype of transmembrane 9 superfamily 4 (TM9SF4) knockout mice suggests a relationship between TM9SF4 proteins and bone homeostasis. But the effect of TM9SF4 in osteology has never been reported. In the present study, we investigated the function of TM9SF4 in MSC differentiation commitment, as well as its role in osteoporosis. METHODS Primary bone marrow MSCs, isolated from TM9SF4 wildtype (TM9SF4+/+) and knockout (TM9SF4-/-) mice, were induced to differentiate into osteoblasts or adipocytes, respectively. The osteogenesis was examined by qRT-PCR detection of osteogenic markers, ALP staining and Alizarin Red S staining. The adipogenesis was tested by qRT-PCR quantification of adipogenic markers and Oil Red O staining. The cytoskeletal organization of MSCs was observed under confocal microscope. The osteoporotic model was induced by ovariectomy in TM9SF4+/+ and TM9SF4-/- mice, followed by Toluidine blue and H&E staining to assess lipid accumulation in trabecular bones, as well as micro-computed tomography scanning and immunohistochemistry staining for bone mass density assessment. The experiments on signaling pathways were conducted using qRT-PCR, Western blot and Alizarin Red S staining. RESULTS We determined the role of TM9SF4 in MSC differentiation and found that TM9SF4-/- MSCs had higher potential to differentiate into osteoblasts and lower capability into adipocytes, without affecting osteoclastogenesis in vitro. In ovariectomy-induced osteoporotic model, TM9SF4-/- mice retained higher bone mass and less lipid accumulation in trabecular bones, indicating an important role of TM9SF4 in the regulation of osteoporosis. Mechanistically, TM9SF4-depleted cells showed elongated actin fibers, which may act through mTORC2/Akt/β-catenin pathway to promote their commitment into osteoblasts. Furthermore, TM9SF4-depleted cells showed higher activity of canonical Wnt pathway, suggesting the participation of Wnt/β-catenin during TM9SF4-regulated osteogenesis. CONCLUSIONS Our study demonstrates TM9SF4 as a novel regulator for MSC lineage commitment. Depletion of TM9SF4 preferentially drives MSCs into osteoblasts instead of adipocytes. Furthermore, TM9SF4-/- mice show delayed bone loss and reduced lipid accumulation during ovariectomy-induced osteoporosis. Our results indicate TM9SF4 as a promising target for the future clinical osteoporotic treatment.
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Affiliation(s)
- Libo Yu
- School of Biomedical Sciences, Heart and Vascular Institute and Li Ka Shing Institute of Health Science, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, People's Republic of China.,Shenzhen Institute of Translational Medicine, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, People's Republic of China
| | - Mingxu Xie
- School of Biomedical Sciences, Heart and Vascular Institute and Li Ka Shing Institute of Health Science, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, People's Republic of China
| | - Fengjie Zhang
- MOE Key Laboratory for Regenerative Medicine, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, People's Republic of China
| | - Chao Wan
- MOE Key Laboratory for Regenerative Medicine, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, People's Republic of China
| | - Xiaoqiang Yao
- School of Biomedical Sciences, Heart and Vascular Institute and Li Ka Shing Institute of Health Science, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, People's Republic of China. .,Centre for Cell and Developmental Biology, State Key Laboratory of Agrobiotechnology, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, People's Republic of China.
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Yang L, Qiu LM, Fang Q, Stanley DW, Ye GY. Cellular and humoral immune interactions between Drosophila and its parasitoids. INSECT SCIENCE 2021; 28:1208-1227. [PMID: 32776656 DOI: 10.1111/1744-7917.12863] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 07/09/2020] [Accepted: 07/30/2020] [Indexed: 05/26/2023]
Abstract
The immune interactions occurring between parasitoids and their host insects, especially in Drosophila-wasp models, have long been the research focus of insect immunology and parasitology. Parasitoid infestation in Drosophila is counteracted by its multiple natural immune defense systems, which include cellular and humoral immunity. Occurring in the hemocoel, cellular immune responses involve the proliferation, differentiation, migration and spreading of host hemocytes and parasitoid encapsulation by them. Contrastingly, humoral immune responses rely more heavily on melanization and on the Toll, Imd and Jak/Stat immune pathways associated with antimicrobial peptides along with stress factors. On the wasps' side, successful development is achieved by introducing various virulence factors to counteract immune responses of Drosophila. Some or all of these factors manipulate the host's immunity for successful parasitism. Here we review current knowledge of the cellular and humoral immune interactions between Drosophila and its parasitoids, focusing on the defense mechanisms used by Drosophila and the strategies evolved by parasitic wasps to outwit it.
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Affiliation(s)
- Lei Yang
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Li-Ming Qiu
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Qi Fang
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - David W Stanley
- USDA Agricultural Research Service, Biological Control of Insects Research Laboratory, Columbia, Missouri, United States
| | - Gong-Yin Ye
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
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Hiroguchi A, Sakamoto S, Mitsuda N, Miwa K. Golgi-localized membrane protein AtTMN1/EMP12 functions in the deposition of rhamnogalacturonan II and I for cell growth in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:3611-3629. [PMID: 33587102 PMCID: PMC8096605 DOI: 10.1093/jxb/erab065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 02/10/2021] [Indexed: 05/20/2023]
Abstract
Appropriate pectin deposition in cell walls is important for cell growth in plants. Rhamnogalacturonan II (RG-II) is a portion of pectic polysaccharides; its borate crosslinking is essential for maintenance of pectic networks. However, the overall process of RG-II synthesis is not fully understood. To identify a novel factor for RG-II deposition or dimerization in cell walls, we screened Arabidopsis mutants with altered boron (B)-dependent growth. The mutants exhibited alleviated disorders of primary root and stem elongation, and fertility under low B, but reduced primary root lengths under sufficient B conditions. Altered primary root elongation was associated with cell elongation changes caused by loss of function in AtTMN1 (Transmembrane Nine 1)/EMP12, which encodes a Golgi-localized membrane protein of unknown function that is conserved among eukaryotes. Mutant leaf and root dry weights were lower than those of wild-type plants, regardless of B conditions. In cell walls, AtTMN1 mutations reduced concentrations of B, RG-II specific 2-keto-3-deoxy monosaccharides, and rhamnose largely derived from rhamnogalacturonan I (RG-I), suggesting reduced RG-II and RG-I. Together, our findings demonstrate that AtTMN1 is required for the deposition of RG-II and RG-I for cell growth and suggest that pectin modulates plant growth under low B conditions.
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Affiliation(s)
- Akihiko Hiroguchi
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Shingo Sakamoto
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305–8566, Japan
| | - Nobutaka Mitsuda
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305–8566, Japan
| | - Kyoko Miwa
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
- Correspondence:
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12
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Liu Y, Tian S, Thaker H, Dong M. Shiga Toxins: An Update on Host Factors and Biomedical Applications. Toxins (Basel) 2021; 13:222. [PMID: 33803852 PMCID: PMC8003205 DOI: 10.3390/toxins13030222] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/13/2021] [Accepted: 03/15/2021] [Indexed: 12/18/2022] Open
Abstract
Shiga toxins (Stxs) are classic bacterial toxins and major virulence factors of toxigenic Shigella dysenteriae and enterohemorrhagic Escherichia coli (EHEC). These toxins recognize a glycosphingolipid globotriaosylceramide (Gb3/CD77) as their receptor and inhibit protein synthesis in cells by cleaving 28S ribosomal RNA. They are the major cause of life-threatening complications such as hemolytic uremic syndrome (HUS), associated with severe cases of EHEC infection, which is the leading cause of acute kidney injury in children. The threat of Stxs is exacerbated by the lack of toxin inhibitors and effective treatment for HUS. Here, we briefly summarize the Stx structure, subtypes, in vitro and in vivo models, Gb3 expression and HUS, and then introduce recent studies using CRISPR-Cas9-mediated genome-wide screens to identify the host cell factors required for Stx action. We also summarize the latest progress in utilizing and engineering Stx components for biomedical applications.
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Affiliation(s)
- Yang Liu
- Department of Nephrology, The First Hospital of Jilin University, Changchun 130021, China
- Department of Urology, Boston Children’s Hospital, Boston, MA 02115, USA; (S.T.); (H.T.)
- Department of Microbiology and Department of Surgery, Harvard Medical School, Boston, MA 02115, USA
| | - Songhai Tian
- Department of Urology, Boston Children’s Hospital, Boston, MA 02115, USA; (S.T.); (H.T.)
- Department of Microbiology and Department of Surgery, Harvard Medical School, Boston, MA 02115, USA
| | - Hatim Thaker
- Department of Urology, Boston Children’s Hospital, Boston, MA 02115, USA; (S.T.); (H.T.)
- Department of Microbiology and Department of Surgery, Harvard Medical School, Boston, MA 02115, USA
| | - Min Dong
- Department of Urology, Boston Children’s Hospital, Boston, MA 02115, USA; (S.T.); (H.T.)
- Department of Microbiology and Department of Surgery, Harvard Medical School, Boston, MA 02115, USA
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13
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Luteijn RD, van Diemen F, Blomen VA, Boer IGJ, Manikam Sadasivam S, van Kuppevelt TH, Drexler I, Brummelkamp TR, Lebbink RJ, Wiertz EJ. A Genome-Wide Haploid Genetic Screen Identifies Heparan Sulfate-Associated Genes and the Macropinocytosis Modulator TMED10 as Factors Supporting Vaccinia Virus Infection. J Virol 2019; 93:e02160-18. [PMID: 30996093 PMCID: PMC6580964 DOI: 10.1128/jvi.02160-18] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 04/11/2019] [Indexed: 12/15/2022] Open
Abstract
Vaccinia virus is a promising viral vaccine and gene delivery candidate and has historically been used as a model to study poxvirus-host cell interactions. We employed a genome-wide insertional mutagenesis approach in human haploid cells to identify host factors crucial for vaccinia virus infection. A library of mutagenized HAP1 cells was exposed to modified vaccinia virus Ankara (MVA). Deep-sequencing analysis of virus-resistant cells identified host factors involved in heparan sulfate synthesis, Golgi organization, and vesicular protein trafficking. We validated EXT1, TM9SF2, and TMED10 (TMP21/p23/p24δ) as important host factors for vaccinia virus infection. The critical roles of EXT1 in heparan sulfate synthesis and vaccinia virus infection were confirmed. TM9SF2 was validated as a player mediating heparan sulfate expression, explaining its contribution to vaccinia virus infection. In addition, TMED10 was found to be crucial for virus-induced plasma membrane blebbing and phosphatidylserine-induced macropinocytosis, presumably by regulating the cell surface expression of the TAM receptor Axl.IMPORTANCE Poxviruses are large DNA viruses that can infect a wide range of host species. A number of these viruses are clinically important to humans, including variola virus (smallpox) and vaccinia virus. Since the eradication of smallpox, zoonotic infections with monkeypox virus and cowpox virus are emerging. Additionally, poxviruses can be engineered to specifically target cancer cells and are used as a vaccine vector against tuberculosis, influenza, and coronaviruses. Poxviruses rely on host factors for most stages of their life cycle, including attachment to the cell and entry. These host factors are crucial for virus infectivity and host cell tropism. We used a genome-wide knockout library of host cells to identify host factors necessary for vaccinia virus infection. We confirm a dominant role for heparin sulfate in mediating virus attachment. Additionally, we show that TMED10, previously not implicated in virus infections, facilitates virus uptake by modulating the cellular response to phosphatidylserine.
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Affiliation(s)
- Rutger D Luteijn
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Ferdy van Diemen
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - Ingrid G J Boer
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - Toin H van Kuppevelt
- Department of Biochemistry, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ingo Drexler
- Institute for Virology, Universitätsklinikum Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
| | | | - Robert Jan Lebbink
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Emmanuel J Wiertz
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
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14
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Knockdown of TM9SF4 boosts ER stress to trigger cell death of chemoresistant breast cancer cells. Oncogene 2019; 38:5778-5791. [PMID: 31249383 DOI: 10.1038/s41388-019-0846-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 05/09/2019] [Accepted: 05/10/2019] [Indexed: 02/02/2023]
Abstract
Drug resistance is one of the major obstacles to breast cancer therapy. However, the mechanisms of how cancer cells develop chemoresistance are still not fully understood. In the present study, we found that expression of TM9SF4 proteins was much higher in adriamycin (ADM)-resistant breast cancer cells MCF-7/ADM than in its parental line wild-type breast cancer cells MCF-7/WT. shRNA-mediated knockdown of TM9SF4 preferentially reduced cell growth and triggered cell death in chemoresistant MCF-7/ADM cells compared with MCF-7/WT cells. Knockdown of TM9SF4 also reduced cell growth and triggered cell death in chemoresistant MDA-MB-231/GEM cells. Mechanistic studies showed that TM9SF4 knockdown increased protein misfolding and elevated endoplasmic reticulum (ER) stress level in MCF-7/ADM cells, as indicated by aggresome formation and upregulated expression of ER stress markers, the effect of which was reversed by a small molecule chaperone 4-phenybutyric acid. In an athymic nude mouse model of ADM-resistant human breast xenograft tumor, knockdown of TM9SF4 decreased the growth of tumor xenografts. In chemoresistant breast cancer patients, chemotherapy increased the expression of TM9SF4 proteins in breast tumor samples. Taken together, these results uncovered a novel role of TM9SF4 proteins in alleviating ER stress and protecting chemoresistant breast cancer cells from apoptotic/necrotic cell death. These results highlight a possible strategy of targeting TM9SF4 to overcome breast cancer chemoresistance.
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15
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Yamaji T, Sekizuka T, Tachida Y, Sakuma C, Morimoto K, Kuroda M, Hanada K. A CRISPR Screen Identifies LAPTM4A and TM9SF Proteins as Glycolipid-Regulating Factors. iScience 2019; 11:409-424. [PMID: 30660999 PMCID: PMC6348303 DOI: 10.1016/j.isci.2018.12.039] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 11/13/2018] [Accepted: 12/28/2018] [Indexed: 12/02/2022] Open
Abstract
Glycosphingolipids (GSLs) are produced by various GSL-synthesizing enzymes, but post-translational regulation of these enzymes is incompletely understood. To address this knowledge disparity, we focused on biosynthesis of globotriaosylceramide (Gb3), the Shiga toxin (STx) receptor, and performed a genome-wide CRISPR/CAS9 knockout screen in HeLa cells using STx1-mediated cytotoxicity. We identified various genes including sphingolipid-related genes and membrane-trafficking genes. In addition, we found two proteins, LAPTM4A and TM9SF2, for which physiological roles remain elusive. Disruption of either LAPTM4A or TM9SF2 genes reduced Gb3 biosynthesis, resulting in accumulation of its precursor, lactosylceramide. Loss of LAPTM4A decreased endogenous Gb3 synthase activity in a post-transcriptional mechanism, whereas loss of TM9SF2 did not affect Gb3 synthase activity but instead disrupted localization of Gb3 synthase. Furthermore, the Gb3-regulating activity of TM9SF2 was conserved in the TM9SF family. These results provide mechanistic insight into the post-translational regulation of the activity and localization of Gb3 synthase. Genome-wide CRISPR knockout screening using Shiga toxin-induced cell death Both LAPTM4A and TM9SF2 are required for Gb3 biosynthesis Loss of LAPTM4A reduces Gb3 synthase activity post-transcriptionally TM9SF2 regulates the subcellular localization of Gb3 synthase
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Affiliation(s)
- Toshiyuki Yamaji
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
| | - Tsuyoshi Sekizuka
- Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Yuriko Tachida
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Chisato Sakuma
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Kanta Morimoto
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan; Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda-ku, Tokyo 101-8308, Japan
| | - Makoto Kuroda
- Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Kentaro Hanada
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
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16
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Abstract
Cell-in-cell structures are reported in numerous cancers, and their presence is an indicator for poor prognosis. Mechanistic studies have identified how cancer cells manage to ingest whole neighbouring cells to form such structures, and the consequences of cell-in-cell formation on cancer progression have been elucidated. In this Opinion article, we discuss how two related cell-in-cell processes, cell cannibalism and entosis, are regulated and how these mechanisms promote cancer progression. We propose that cannibalistic activity is a hallmark of cancer that results in part from selection by metabolic stress and serves to feed aggressive cancer cells.
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Affiliation(s)
- Stefano Fais
- Department of Oncology and Molecular Medicine, National Institute of Health, Rome, Italy.
| | - Michael Overholtzer
- Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
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17
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Tian S, Muneeruddin K, Choi MY, Tao L, Bhuiyan RH, Ohmi Y, Furukawa K, Furukawa K, Boland S, Shaffer SA, Adam RM, Dong M. Genome-wide CRISPR screens for Shiga toxins and ricin reveal Golgi proteins critical for glycosylation. PLoS Biol 2018; 16:e2006951. [PMID: 30481169 PMCID: PMC6258472 DOI: 10.1371/journal.pbio.2006951] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 10/02/2018] [Indexed: 12/15/2022] Open
Abstract
Glycosylation is a fundamental modification of proteins and membrane lipids. Toxins that utilize glycans as their receptors have served as powerful tools to identify key players in glycosylation processes. Here, we carried out Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)-Cas9-mediated genome-wide loss-of-function screens using two related bacterial toxins, Shiga-like toxins (Stxs) 1 and 2, which use a specific glycolipid, globotriaosylceramide (Gb3), as receptors, and the plant toxin ricin, which recognizes a broad range of glycans. The Stxs screens identified major glycosyltransferases (GTs) and transporters involved in Gb3 biosynthesis, while the ricin screen identified GTs and transporters involved in N-linked protein glycosylation and fucosylation. The screens also identified lysosomal-associated protein transmembrane 4 alpha (LAPTM4A), a poorly characterized four-pass membrane protein, as a factor specifically required for Stxs. Mass spectrometry analysis of glycolipids and their precursors demonstrates that LAPTM4A knockout (KO) cells lack Gb3 biosynthesis. This requirement of LAPTM4A for Gb3 synthesis is not shared by its homolog lysosomal-associated protein transmembrane 4 beta (LAPTM4B), and switching the domains between them determined that the second luminal domain of LAPTM4A is required, potentially acting as a specific "activator" for the GT that synthesizes Gb3. These screens also revealed two Golgi proteins, Transmembrane protein 165 (TMEM165) and Transmembrane 9 superfamily member 2 (TM9SF2), as shared factors required for both Stxs and ricin. TMEM165 KO and TM9SF2 KO cells both showed a reduction in not only Gb3 but also other glycosphingolipids, suggesting that they are required for maintaining proper levels of glycosylation in general in the Golgi. In addition, TM9SF2 KO cells also showed defective endosomal trafficking. These studies reveal key Golgi proteins critical for regulating glycosylation and glycolipid synthesis and provide novel therapeutic targets for blocking Stxs and ricin toxicity.
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Affiliation(s)
- Songhai Tian
- Department of Urology, Boston Children’s Hospital, Boston, Massachusetts, United States of America
- Department of Surgery, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Khaja Muneeruddin
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
- Mass Spectrometry Facility, University of Massachusetts Medical School, Shrewsbury, Massachusetts, United States of America
| | - Mei Yuk Choi
- Division of Genetics, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Liang Tao
- Department of Urology, Boston Children’s Hospital, Boston, Massachusetts, United States of America
- Department of Surgery, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Robiul H. Bhuiyan
- Department of Biomedical Sciences, Chubu University College of Life and Health Sciences, Matsumoto, Kasugai, Aichi, Japan
| | - Yuhsuke Ohmi
- Department of Biomedical Sciences, Chubu University College of Life and Health Sciences, Matsumoto, Kasugai, Aichi, Japan
| | - Keiko Furukawa
- Department of Biomedical Sciences, Chubu University College of Life and Health Sciences, Matsumoto, Kasugai, Aichi, Japan
| | - Koichi Furukawa
- Department of Biomedical Sciences, Chubu University College of Life and Health Sciences, Matsumoto, Kasugai, Aichi, Japan
| | - Sebastian Boland
- Department of Genetics and Complex Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, United States of America
| | - Scott A. Shaffer
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
- Mass Spectrometry Facility, University of Massachusetts Medical School, Shrewsbury, Massachusetts, United States of America
| | - Rosalyn M. Adam
- Department of Urology, Boston Children’s Hospital, Boston, Massachusetts, United States of America
- Department of Surgery, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Min Dong
- Department of Urology, Boston Children’s Hospital, Boston, Massachusetts, United States of America
- Department of Surgery, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
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18
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Abstract
Autophagy influences cell survival through maintenance of cell bioenergetics and clearance of protein aggregates and damaged organelles. Several lines of evidence indicate that autophagy is a multifaceted regulator of cell death, but controversy exists over whether autophagy alone can drive cell death under physiologically relevant circumstances. Here, we review the role of autophagy in cell death and examine how autophagy interfaces with other forms of cell death including apoptosis and necrosis.
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19
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Hu QQ, Wei XH, Li YP, Wang JL, Liu XS. Identification and characterization of a gene involved in the encapsulation response of Helicoverpa armigera haemocytes. INSECT MOLECULAR BIOLOGY 2017; 26:752-762. [PMID: 28745455 DOI: 10.1111/imb.12336] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Encapsulation is a kind of cellular immune response of insect haemocytes, which results in the formation of capsules around invading parasites. However, the molecular mechanism of this response is largely unknown. In this study, we identified a potential immune-related gene in the cotton bollworm, Helicoverpa armigera, called defence protein 1 (Ha-DFP1). A tissue distribution analysis revealed that Ha-DFP1 protein was expressed in haemocytes and secreted into the haemolymph of Helic. armigera larvae. The Ha-DFP1 mRNA transcript level in haemocytes and the concentration of the Ha-DFP1 protein in haemolymph both increased after injecting chromatography beads. Purified recombinant Ha-DFP1 bound to the surface of haemocytes and promoted haemocyte encapsulation on chromatography beads in vitro. The spreading ability of haemocytes was inhibited when Ha-DFP1 expression in Helic. armigera larval haemocytes decreased in response to the injection of double-stranded RNA specific to Ha-DFP1, and the encapsulation ability of haemocytes was impaired. Based on these results, we speculate that Ha-DFP1 plays an important role in the Helic. armigera encapsulation response, possibly by binding to the haemocyte surface and mediating spreading behaviour.
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Affiliation(s)
- Q-Q Hu
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - X-H Wei
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Y-P Li
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - J-L Wang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - X-S Liu
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
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20
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Sun L, Meng Z, Zhu Y, Lu J, Li Z, Zhao Q, Huang Y, Jiang L, Yao X. TM9SF4 is a novel factor promoting autophagic flux under amino acid starvation. Cell Death Differ 2017; 25:368-379. [PMID: 29125601 DOI: 10.1038/cdd.2017.166] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 09/06/2017] [Accepted: 09/08/2017] [Indexed: 12/16/2022] Open
Abstract
Autophagy is a highly complicated process with participation of large numbers of autophagy-related proteins. Under nutrient starvation, autophagy promotes cell survival by breaking down nonessential cellular components for recycling use. However, due to its high complexity, molecular mechanism of autophagy is still not fully understood. In the present study, we report a novel autophagy-related protein TM9SF4, which plays a functional role in the induction phase of autophagic process. TM9SF4 proteins were abundantly expressed in the kidney, especially in renal proximal tubular epithelial cells. At subcellular cells, TM9SF4 proteins were mostly localized in lysosome, Golgi, late endosome and autophagosome. Knockdown of TM9SF4 with TM9SF4-shRNAs markedly reduced the starvation-induced autophagy in HEK293 cells, the effect of which persisted in the presence of bafilomycin A1. TM9SF4-shRNAs also substantially attenuated the starvation-induced mTOR inactivation. In animal model, starvation was able to induce LC3-II accumulation and cause mTOR inactivation in renal cortical tissue in wild-type mice, the effect of which was minimal/absent in TM9SF4 knockout (TM9SF4-/-) mice. Co-immunoprecipitation and proximity ligation assay demonstrated physical interaction of TM9SF4 proteins with mTOR. In addition, knockdown or knockout of TM9SF4 reduced the starvation-induced cell death in HEK293 cells and animal model. Taken together, the present study identifies TM9SF4 as a novel autophagy-related protein. Under nutrient starvation, TM9SF4 functions to facilitate mTOR inactivation, resulting in an enhanced autophagic flux, which serves to protect cells from apoptotic cell death.
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Affiliation(s)
- Lei Sun
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Zhaoyue Meng
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,School of Life Sciences, Centre for Cell & Developmental Biology and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Yifei Zhu
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Jun Lu
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Zhichao Li
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Qiannan Zhao
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Yu Huang
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China
| | - Liwen Jiang
- School of Life Sciences, Centre for Cell & Developmental Biology and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Xiaoqiang Yao
- Li Ka Shing Institute of Health Sciences and School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
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21
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Di Narzo AF, Peters LA, Argmann C, Stojmirovic A, Perrigoue J, Li K, Telesco S, Kidd B, Walker J, Dudley J, Cho J, Schadt EE, Kasarskis A, Curran M, Dobrin R, Hao K. Blood and Intestine eQTLs from an Anti-TNF-Resistant Crohn's Disease Cohort Inform IBD Genetic Association Loci. Clin Transl Gastroenterol 2016; 7:e177. [PMID: 27336838 PMCID: PMC4931595 DOI: 10.1038/ctg.2016.34] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 04/15/2016] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVES: Genome-wide association studies (GWAS) have identified loci reproducibly associated with inflammatory bowel disease (IBD) and other immune-mediated diseases; however, the molecular mechanisms underlying most of genetic susceptibility remain undefined. Expressional quantitative trait loci (eQTL) of disease-relevant tissue can be employed in order to elucidate the genes and pathways affected by disease-specific genetic variance. METHODS: In this study, we derived eQTLs for human whole blood and intestine tissues of anti-tumor necrosis factor-resistant Crohn's disease (CD) patients. We interpreted these eQTLs in the context of published IBD GWAS hits to inform on the disease process. RESULTS: At 10% false discovery rate, we discovered that 5,174 genes in blood and 2,063 genes in the intestine were controlled by a nearby single-nucleotide polymorphism (SNP) (i.e., cis-eQTL), among which 1,360 were shared between the two tissues. A large fraction of the identified eQTLs were supported by the regulomeDB database, showing that the eQTLs reside in regulatory elements (odds ratio; OR=3.44 and 3.24 for blood and intestine eQTLs, respectively) as opposed to protein-coding regions. Published IBD GWAS hits as a whole were enriched for blood and intestine eQTLs (OR=2.88 and 2.05; and P value=2.51E-9 and 0.013, respectively), thereby linking genetic susceptibility to control of gene expression in these tissues. Through a systematic search, we used eQTL data to inform 109 out of 372 IBD GWAS SNPs documented in National Human Genome Research Institute catalog, and we categorized the genes influenced by eQTLs according to their functions. Many of these genes have experimentally validated roles in specific cell types contributing to intestinal inflammation. CONCLUSIONS: The blood and intestine eQTLs described in this study represent a powerful tool to link GWAS loci to a regulatory function and thus elucidate the mechanisms underlying the genetic loci associated with IBD and related conditions. Overall, our eQTL discovery approach empirically identifies the disease-associated variants including their impact on the direction and extent of expression changes in the context of disease-relevant cellular pathways in order to infer the functional outcome of this aspect of genetic susceptibility.
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Affiliation(s)
- Antonio F Di Narzo
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Lauren A Peters
- Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Carmen Argmann
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | | | | | - Katherine Li
- Janssen R&D, LLC, 1400 McKean Road, Spring House, PA, USA
| | | | - Brian Kidd
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Jennifer Walker
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Joel Dudley
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Judy Cho
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Eric E Schadt
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Andrew Kasarskis
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Mark Curran
- Janssen R&D, LLC, 1400 McKean Road, Spring House, PA, USA
| | - Radu Dobrin
- Janssen R&D, LLC, 1400 McKean Road, Spring House, PA, USA
| | - Ke Hao
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
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22
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Gold KS, Brückner K. Macrophages and cellular immunity in Drosophila melanogaster. Semin Immunol 2016; 27:357-68. [PMID: 27117654 DOI: 10.1016/j.smim.2016.03.010] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 01/08/2016] [Indexed: 12/16/2022]
Abstract
The invertebrate Drosophila melanogaster has been a powerful model for understanding blood cell development and immunity. Drosophila is a holometabolous insect, which transitions through a series of life stages from embryo, larva and pupa to adulthood. In spite of this, remarkable parallels exist between Drosophila and vertebrate macrophages, both in terms of development and function. More than 90% of Drosophila blood cells (hemocytes) are macrophages (plasmatocytes), making this highly tractable genetic system attractive for studying a variety of questions in macrophage biology. In vertebrates, recent findings revealed that macrophages have two independent origins: self-renewing macrophages, which reside and proliferate in local microenvironments in a variety of tissues, and macrophages of the monocyte lineage, which derive from hematopoietic stem or progenitor cells. Like vertebrates, Drosophila possesses two macrophage lineages with a conserved dual ontogeny. These parallels allow us to take advantage of the Drosophila model when investigating macrophage lineage specification, maintenance and amplification, and the induction of macrophages and their progenitors by local microenvironments and systemic cues. Beyond macrophage development, Drosophila further serves as a paradigm for understanding the mechanisms underlying macrophage function and cellular immunity in infection, tissue homeostasis and cancer, throughout development and adult life.
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Affiliation(s)
| | - Katja Brückner
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research; Department of Cell and Tissue Biology; Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, United States.
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23
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Breton CV, Gao L, Yao J, Siegmund KD, Lurmann F, Gilliland F. Particulate matter, the newborn methylome, and cardio-respiratory health outcomes in childhood. ENVIRONMENTAL EPIGENETICS 2016; 2:dvw005. [PMID: 29492287 PMCID: PMC5804519 DOI: 10.1093/eep/dvw005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/18/2016] [Accepted: 03/22/2016] [Indexed: 05/22/2023]
Abstract
Ambient air pollution is associated with adverse health outcomes including cardio-respiratory diseases. Epigenetic mechanisms such as DNA methylation may play a role in driving such associations. We investigated the effects of prenatal particulate matter (PM) exposure on DNA methylation of 178,309 promoter regions in 240 newborns using the Infinium HumanMethylation450 BeadChip, using a generalized linear regression model with a quasi-binomial link family, adjusted for gender, plate, and cell types. PM-associated CpG loci were then investigated for their associations with childhood asthma, carotid intima-media thickness (CIMT), and blood pressure (BP) using logistic or linear regression. Thirty-one loci were associated with either PM10 or PM2.5 using FDR-corrected p-values of less than 0.15. Two loci were evaluated for replication in a separate population of 280 Children's Health Study (CHS) subjects using Pyrosequencing, of which one successfully replicated (COLEC11 cg03579365). Three of the 31 loci were also associated with physician-diagnosed asthma at 6 years old, two were associated with CIMT and one with systolic BP at 10 years old. A higher methylation level in TM9SF2 (cg02015529) and UBE2S (cg00035623), respectively, was associated with a 2SD increase in prenatal PM and was also associated with 36% and 98% increased odds of asthma; whereas methylation of TDRD6 (cg22329831) was negatively associated with PM and a 24% decreased odds of asthma. Prenatal PM exposure was associated with altered DNA methylation in newborn blood in a small number of gene promoters, some of which were also associated with cardio-respiratory health outcomes later in childhood. Keywords: methylation, particulate matter, air pollution, asthma, cardiovascular.
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Affiliation(s)
- Carrie V. Breton
- University of Southern California, Dept of Preventive Medicine, 2001 N Soto St, Los Angeles, CA 90089, USA
- *Correspondence address: Carrie Breton, ScD., Department of Preventive Medicine, USC Keck School of Medicine, 2001 N. Soto Street, Los Angeles, CA 90032, USA. Tel: +1 (323) 442-7383; Fax: +1 (323) 442-3272; E-mail:
| | - Lu Gao
- University of Southern California, Dept of Preventive Medicine, 2001 N Soto St, Los Angeles, CA 90089, USA
| | - Jin Yao
- University of Southern California, Dept of Preventive Medicine, 2001 N Soto St, Los Angeles, CA 90089, USA
| | - Kimberly D. Siegmund
- University of Southern California, Dept of Preventive Medicine, 2001 N Soto St, Los Angeles, CA 90089, USA
| | - Fred Lurmann
- Sonoma Technology Inc, 1455 N. McDowell Blvd, Suite D, Petaluma, CA 94954-6503, USA
| | - Frank Gilliland
- University of Southern California, Dept of Preventive Medicine, 2001 N Soto St, Los Angeles, CA 90089, USA
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The raspberry Gene Is Involved in the Regulation of the Cellular Immune Response in Drosophila melanogaster. PLoS One 2016; 11:e0150910. [PMID: 26942456 PMCID: PMC4778902 DOI: 10.1371/journal.pone.0150910] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/21/2016] [Indexed: 12/17/2022] Open
Abstract
Drosophila is an extremely useful model organism for understanding how innate immune mechanisms defend against microbes and parasitoids. Large foreign objects trigger a potent cellular immune response in Drosophila larva. In the case of endoparasitoid wasp eggs, this response includes hemocyte proliferation, lamellocyte differentiation and eventual encapsulation of the egg. The encapsulation reaction involves the attachment and spreading of hemocytes around the egg, which requires cytoskeletal rearrangements, changes in adhesion properties and cell shape, as well as melanization of the capsule. Guanine nucleotide metabolism has an essential role in the regulation of pathways necessary for this encapsulation response. Here, we show that the Drosophila inosine 5'-monophosphate dehydrogenase (IMPDH), encoded by raspberry (ras), is centrally important for a proper cellular immune response against eggs from the parasitoid wasp Leptopilina boulardi. Notably, hemocyte attachment to the egg and subsequent melanization of the capsule are deficient in hypomorphic ras mutant larvae, which results in a compromised cellular immune response and increased survival of the parasitoid.
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Perrin J, Le Coadic M, Vernay A, Dias M, Gopaldass N, Ouertatani-Sakouhi H, Cosson P. TM9 family proteins control surface targeting of glycine-rich transmembrane domains. J Cell Sci 2015; 128:2269-77. [PMID: 25999474 PMCID: PMC4510845 DOI: 10.1242/jcs.164848] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 04/30/2015] [Indexed: 11/20/2022] Open
Abstract
TM9 family proteins (also named Phg1 proteins) have been previously shown to control cell adhesion by determining the cell surface localization of adhesion proteins such as the Dictyostelium SibA protein. Here, we show that the glycine-rich transmembrane domain (TMD) of SibA is sufficient to confer Phg1A-dependent surface targeting to a reporter protein. Accordingly, in Dictyostelium phg1A-knockout (KO) cells, proteins with glycine-rich TMDs were less efficiently transported out of the endoplasmic reticulum (ER) and to the cell surface. Phg1A, as well as its human ortholog TM9SF4 specifically associated with glycine-rich TMDs. In human cells, genetic inactivation of TM9SF4 resulted in an increased retention of glycine-rich TMDs in the endoplasmic reticulum, whereas TM9SF4 overexpression enhanced their surface localization. The bulk of the TM9SF4 protein was localized in the Golgi complex and a proximity-ligation assay suggested that it might interact with glycine-rich TMDs. Taken together, these results suggest that one of the main roles of TM9 proteins is to serve as intramembrane cargo receptors controlling exocytosis and surface localization of a subset of membrane proteins. Summary: TM9 proteins facilitate transport to the cell surface of proteins with gylcine-rich transmembrane domains. They might represent a new class of cargo receptors controlling transport in the secretory pathway.
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Affiliation(s)
- Jackie Perrin
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1 rue Michel Servet, Geneva 4 CH-1211, Switzerland
| | - Marion Le Coadic
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1 rue Michel Servet, Geneva 4 CH-1211, Switzerland
| | - Alexandre Vernay
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1 rue Michel Servet, Geneva 4 CH-1211, Switzerland
| | - Marco Dias
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1 rue Michel Servet, Geneva 4 CH-1211, Switzerland
| | - Navin Gopaldass
- Department of Biochemistry, Sciences II, University of Geneva, 30 quai Ernest-Ansermet, Geneva 4 CH-1211, Switzerland
| | - Hajer Ouertatani-Sakouhi
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1 rue Michel Servet, Geneva 4 CH-1211, Switzerland
| | - Pierre Cosson
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1 rue Michel Servet, Geneva 4 CH-1211, Switzerland
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Paolillo R, Spinello I, Quaranta MT, Pasquini L, Pelosi E, Lo Coco F, Testa U, Labbaye C. Human TM9SF4 Is a New Gene Down-Regulated by Hypoxia and Involved in Cell Adhesion of Leukemic Cells. PLoS One 2015; 10:e0126968. [PMID: 25961573 PMCID: PMC4427288 DOI: 10.1371/journal.pone.0126968] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 04/09/2015] [Indexed: 12/19/2022] Open
Abstract
Background The transmembrane 9 superfamily protein member 4, TM9SF4, belongs to the TM9SF family of proteins highly conserved through evolution. TM9SF4 homologs, previously identified in many different species, were mainly involved in cellular adhesion, innate immunity and phagocytosis. In human, the function and biological significance of TM9SF4 are currently under investigation. However, TM9SF4 was found overexpressed in human metastatic melanoma and in a small subset of acute myeloid leukemia (AMLs) and myelodysplastic syndromes, consistent with an oncogenic function of this gene. Purpose and Results In this study, we first analyzed the expression and regulation of TM9SF4 in normal and leukemic cells and identified TM9SF4 as a gene highly expressed in human quiescent CD34+ hematopoietic progenitor cells (HPCs), regulated during monocytic and granulocytic differentiation of HPCs, both lineages giving rise to mature myeloid cells involved in adhesion, phagocytosis and immunity. Then, we found that TM9SF4 is markedly overexpressed in leukemic cells and in AMLs, particularly in M2, M3 and M4 AMLs (i.e., in AMLs characterized by the presence of a more or less differentiated granulocytic progeny), as compared to normal CD34+ HPCs. Proliferation and differentiation of HPCs occurs in hypoxia, a physiological condition in bone marrow, but also a crucial component of cancer microenvironment. Here, we investigated the impact of hypoxia on TM9SF4 expression in leukemic cells and identified TM9SF4 as a direct target of HIF-1α, downregulated in these cells by hypoxia. Then, we found that the hypoxia-mediated downregulation of TM9SF4 expression is associated with a decrease of cell adhesion of leukemic cells to fibronectin, thus demonstrating that human TM9SF4 is a new molecule involved in leukemic cell adhesion. Conclusions Altogether, our study reports for the first time the expression of TM9SF4 at the level of normal and leukemic hematopoietic cells and its marked expression at the level of AMLs displaying granulocytic differentiation.
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MESH Headings
- Apoptosis/drug effects
- Bone Marrow Cells/drug effects
- Bone Marrow Cells/metabolism
- Bone Marrow Cells/pathology
- Cell Adhesion/drug effects
- Cell Cycle/drug effects
- Cell Differentiation/drug effects
- Cell Hypoxia
- Cell Proliferation/drug effects
- Cloning, Molecular
- Fibronectins/metabolism
- Gene Expression Regulation, Leukemic
- Granulocytes/drug effects
- Granulocytes/metabolism
- Granulocytes/pathology
- HEK293 Cells
- Hematopoietic Stem Cells/drug effects
- Hematopoietic Stem Cells/metabolism
- Hematopoietic Stem Cells/pathology
- Humans
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/metabolism
- Leukemia, Myeloid, Acute/pathology
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Monocytes/drug effects
- Monocytes/metabolism
- Monocytes/pathology
- Neoplasm Proteins/genetics
- Neoplasm Proteins/metabolism
- Oxygen/pharmacology
- Primary Cell Culture
- Promoter Regions, Genetic
- Signal Transduction
- Tumor Cells, Cultured
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Affiliation(s)
- Rosa Paolillo
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Isabella Spinello
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Maria Teresa Quaranta
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Luca Pasquini
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Elvira Pelosi
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Francesco Lo Coco
- Department of Biomedicine and Prevention, University of Rome “Tor Vergata”, Rome, Italy
- Fondazione Santa Lucia, Rome, Italy
| | - Ugo Testa
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Catherine Labbaye
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
- * E-mail:
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27
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Perrin J, Mortier M, Jacomin AC, Viargues P, Thevenon D, Fauvarque MO. The nonaspanins TM9SF2 and TM9SF4 regulate the plasma membrane localization and signalling activity of the peptidoglycan recognition protein PGRP-LC in Drosophila. J Innate Immun 2014; 7:37-46. [PMID: 25139117 DOI: 10.1159/000365112] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 06/09/2014] [Indexed: 01/01/2023] Open
Abstract
Transmembrane 9 (TM9) proteins, or nonaspanins, are a family of proteins conserved throughout evolution and characterized by 9 transmembrane domains. In Drosophila, TM9 superfamily protein member 4 (TM9SF4) and its closest paralogue, TM9SF2, contribute to phagocytosis of various types of particles, while TM9SF4 displays non-redundant requirement in Gram-negative bacteria engulfment. In addition, the two TM9 proteins control the actin cytoskeleton in larval haemocytes and in Drosophila S2 cells. Here, we show that TM9SF4 and TM9SF2 co-immunoprecipitate with the peptidoglycan recognition protein (PGRP)-LC, which triggers the Drosophila immune response to bacterial infection. Furthermore, both TM9 proteins co-localize with this receptor in intracellular vesicles and at the plasma membrane in Drosophila S2 cells in culture and in the fly fat body. Silencing TM9SF4 prevents plasma membrane localization of PGRP-LC, whereas silencing TM9SF2 does not, which may account for the non-redundant role of TM9SF4 in phagocytosis of Gram-negative bacteria. Finally, we provide a set of data suggesting that TM9 proteins can prevent inappropriate signalling from the unstimulated receptor.
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28
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The Wnt signaling pathway is involved in the regulation of phagocytosis of virus in Drosophila. Sci Rep 2013; 3:2069. [PMID: 23797713 PMCID: PMC3691566 DOI: 10.1038/srep02069] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 06/03/2013] [Indexed: 12/11/2022] Open
Abstract
Phagocytosis is crucial for triggering host defenses against invading pathogens in animals. However, the receptors on phagocyte surface required for phagocytosis of virus have not been extensively explored. This study demonstrated that white spot syndrome virus (WSSV), a major pathogen of shrimp, could be engulfed but not digested by Drosophila S2 cells, indicating that the virus was not recognized and taken up by a pathway that was silent and would not activate the phagosome maturation and digestion pathway. The results showed that the activation of receptors on S2 cell surface by lipopolysaccharide or peptidoglycan resulted in the phagocytosis of S2 cells against WSSV virions. Gene expression profiles revealed that the dally-mediated Wnt signaling pathway was involved in S2 phagocytosis. Further data showed that the Wnt signaling pathway played an essential role in phagocytosis. Therefore, our study contributed novel insight into the molecular mechanism of phagocytosis in animals.
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Le Coadic M, Froquet R, Lima WC, Dias M, Marchetti A, Cosson P. Phg1/TM9 proteins control intracellular killing of bacteria by determining cellular levels of the Kil1 sulfotransferase in Dictyostelium. PLoS One 2013; 8:e53259. [PMID: 23301051 PMCID: PMC3534706 DOI: 10.1371/journal.pone.0053259] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Accepted: 11/27/2012] [Indexed: 02/02/2023] Open
Abstract
Dictyostelium discoideum has largely been used to study phagocytosis and intracellular killing of bacteria. Previous studies have shown that Phg1A, Kil1 and Kil2 proteins are necessary for efficient intracellular killing of Klebsiella bacteria. Here we show that in phg1a KO cells, cellular levels of lysosomal glycosidases and lysozyme are decreased, and lysosomal pH is increased. Surprisingly, overexpression of Kil1 restores efficient killing in phg1a KO cells without correcting these lysosomal anomalies. Conversely, kil1 KO cells are defective for killing, but their enzymatic content and lysosomal pH are indistinguishable from WT cells. The killing defect of phg1a KO cells can be accounted for by the observation that in these cells the stability and the cellular amount of Kil1 are markedly reduced. Since Kil1 is the only sulfotransferase characterized in Dictyostelium, an (unidentified) sulfated factor, defective in both phg1a and kil1 KO cells, may play a key role in intracellular killing of Klebsiella bacteria. In addition, Phg1B plays a redundant role with Phg1A in controlling cellular amounts of Kil1 and intracellular killing. Finally, cellular levels of Kil1 are unaffected in kil2 KO cells, and Kil1 overexpression does not correct the killing defect of kil2 KO cells, suggesting that Kil2 plays a distinct role in intracellular killing.
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Affiliation(s)
- Marion Le Coadic
- Department of Cell Physiology and Metabolism, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Romain Froquet
- Department of Cell Physiology and Metabolism, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Wanessa C. Lima
- Department of Cell Physiology and Metabolism, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Marco Dias
- Department of Cell Physiology and Metabolism, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Anna Marchetti
- Department of Cell Physiology and Metabolism, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Pierre Cosson
- Department of Cell Physiology and Metabolism, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
- * E-mail:
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Abstract
The deleterious and sometimes fatal outcomes of bacterial infectious diseases are the net result of the interactions between the pathogen and the host, and the genetically tractable fruit fly, Drosophila melanogaster, has emerged as a valuable tool for modeling the pathogen-host interactions of a wide variety of bacteria. These studies have revealed that there is a remarkable conservation of bacterial pathogenesis and host defence mechanisms between higher host organisms and Drosophila. This review presents an in-depth discussion of the Drosophila immune response, the Drosophila killing model, and the use of the model to examine bacterial-host interactions. The recent introduction of the Drosophila model into the oral microbiology field is discussed, specifically the use of the model to examine Porphyromonas gingivalis-host interactions, and finally the potential uses of this powerful model system to further elucidate oral bacterial-host interactions are addressed.
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Affiliation(s)
- Christina O Igboin
- Division of Oral Biology, College of Dentistry, The Ohio State University, Columbus, Ohio, USA
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Froquet R, le Coadic M, Perrin J, Cherix N, Cornillon S, Cosson P. TM9/Phg1 and SadA proteins control surface expression and stability of SibA adhesion molecules in Dictyostelium. Mol Biol Cell 2012; 23:679-86. [PMID: 22219373 PMCID: PMC3279395 DOI: 10.1091/mbc.e11-04-0338] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
ETOC: TM9/Phg1 proteins are essential for cellular adhesion in many systems, from Dictyostelium to human cells, yet their exact role remains unknown. We demonstrate that TM9 proteins participate in adhesion in Dictyostelium cells by controlling the surface levels of SibA adhesion molecules, notably by influencing their sorting in the endocytic pathway. TM9 proteins form a family of conserved proteins with nine transmembrane domains essential for cellular adhesion in many biological systems, but their exact role in this process remains unknown. In this study, we found that genetic inactivation of the TM9 protein Phg1A dramatically decreases the surface levels of the SibA adhesion molecule in Dictyostelium amoebae. This is due to a decrease in sibA mRNA levels, in SibA protein stability, and in SibA targeting to the cell surface. A similar phenotype was observed in cells devoid of SadA, a protein that does not belong to the TM9 family but also exhibits nine transmembrane domains and is essential for cellular adhesion. A contact site A (csA)-SibA chimeric protein comprising only the transmembrane and cytosolic domains of SibA and the extracellular domain of the Dictyostelium surface protein csA also showed reduced stability and relocalization to endocytic compartments in phg1A knockout cells. These results indicate that TM9 proteins participate in cell adhesion by controlling the levels of adhesion proteins present at the cell surface.
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Affiliation(s)
- Romain Froquet
- Département de Physiologie Cellulaire et Métabolisme, Centre Médical Universitaire, 1211 Geneva 4, Switzerland
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Fais S, Fauvarque MO. TM9 and cannibalism: how to learn more about cancer by studying amoebae and invertebrates. Trends Mol Med 2011; 18:4-5. [PMID: 22001540 DOI: 10.1016/j.molmed.2011.09.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Accepted: 09/20/2011] [Indexed: 01/09/2023]
Abstract
Phagocytosis is used not only for immune defense but may also be used to obtain nutrients, as observed when tumor cells feed upon neighboring cells during "tumor cell cannibalism". The TM9 protein TM9SF4, important in canonical phagocytosis, is involved in this cannibalism by metastatic cells and may represent a novel therapeutic target.
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Affiliation(s)
- Stefano Fais
- Anti-Tumour Drugs Section, Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità (Italian National Institute of Health), Rome, Italy
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Effects of elevated seawater pCO(2) on gene expression patterns in the gills of the green crab, Carcinus maenas. BMC Genomics 2011; 12:488. [PMID: 21978240 PMCID: PMC3206878 DOI: 10.1186/1471-2164-12-488] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 10/06/2011] [Indexed: 11/10/2022] Open
Abstract
Background The green crab Carcinus maenas is known for its high acclimation potential to varying environmental abiotic conditions. A high ability for ion and acid-base regulation is mainly based on an efficient regulation apparatus located in gill epithelia. However, at present it is neither known which ion transport proteins play a key role in the acid-base compensation response nor how gill epithelia respond to elevated seawater pCO2 as predicted for the future. In order to promote our understanding of the responses of green crab acid-base regulatory epithelia to high pCO2, Baltic Sea green crabs were exposed to a pCO2 of 400 Pa. Gills were screened for differentially expressed gene transcripts using a 4,462-feature microarray and quantitative real-time PCR. Results Crabs responded mainly through fine scale adjustment of gene expression to elevated pCO2. However, 2% of all investigated transcripts were significantly regulated 1.3 to 2.2-fold upon one-week exposure to CO2 stress. Most of the genes known to code for proteins involved in osmo- and acid-base regulation, as well as cellular stress response, were were not impacted by elevated pCO2. However, after one week of exposure, significant changes were detected in a calcium-activated chloride channel, a hyperpolarization activated nucleotide-gated potassium channel, a tetraspanin, and an integrin. Furthermore, a putative syntaxin-binding protein, a protein of the transmembrane 9 superfamily, and a Cl-/HCO3- exchanger of the SLC 4 family were differentially regulated. These genes were also affected in a previously published hypoosmotic acclimation response study. Conclusions The moderate, but specific response of C. maenas gill gene expression indicates that (1) seawater acidification does not act as a strong stressor on the cellular level in gill epithelia; (2) the response to hypercapnia is to some degree comparable to a hypoosmotic acclimation response; (3) the specialization of each of the posterior gill arches might go beyond what has been demonstrated up to date; and (4) a re-configuration of gill epithelia might occur in response to hypercapnia.
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Fauvarque MO, Williams MJ. Drosophila cellular immunity: a story of migration and adhesion. J Cell Sci 2011; 124:1373-82. [PMID: 21502134 DOI: 10.1242/jcs.064592] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Research during the past 15 years has led to significant breakthroughs, providing evidence of a high degree of similarity between insect and mammalian innate immune responses, both humoural and cellular, and highlighting Drosophila melanogaster as a model system for studying the evolution of innate immunity. In a manner similar to cells of the mammalian monocyte and macrophage lineage, Drosophila immunosurveillance cells (haemocytes) have a number of roles. For example, they respond to wound signals, are involved in wound healing and contribute to the coagulation response. Moreover, they participate in the phagocytosis and encapsulation of invading pathogens, are involved in the removal of apoptotic bodies and produce components of the extracellular matrix. There are several reasons for using the Drosophila cellular immune response as a model to understand cell signalling during adhesion and migration in vivo: many genes involved in the regulation of Drosophila haematopoiesis and cellular immunity have been maintained across taxonomic groups ranging from flies to humans, many aspects of Drosophila and mammalian innate immunity seem to be conserved, and Drosophila is a simplified and well-studied genetic model system. In the present Commentary, we will discuss what is known about cellular adhesion and migration in the Drosophila cellular immune response, during both embryonic and larval development, and where possible compare it with related mechanisms in vertebrates.
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Affiliation(s)
- Marie-Odile Fauvarque
- Institut de Recherches en Technologies et Sciences pour le Vivant, Grenoble, France.
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35
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Global gene disruption in human cells to assign genes to phenotypes by deep sequencing. Nat Biotechnol 2011; 29:542-6. [PMID: 21623355 PMCID: PMC3111863 DOI: 10.1038/nbt.1857] [Citation(s) in RCA: 176] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 03/24/2011] [Indexed: 11/25/2022]
Abstract
Insertional mutagenesis in a haploid background can lead to complete disruption of gene function1. Here we generate a population of human cells that contain insertions in >98% of their expressed genes. We established Phenotypic Interrogation via Tag Sequencing (PhITSeq) as a method to examine millions of mutant alleles through selection and parallel sequencing. Analysis of pools of selected cells rather than individual clones provides a rapid assessment of the spectrum of genes involved in phenotypes under study. This facilitates comparative screens as illustrated here for the family of cytolethal distending toxins (CDTs). CDTs are virulence factors secreted by a variety of pathogenic gram-negative bacteria that cause tissue damage at distinct anatomical sites2. We identified 743 mutations distributed over 12 human genes important for intoxication by four different CDTs. While related CDTs may share host factors, they also exploit unique host factors yielding a characteristic profile for each CDT.
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Chinn LW, Tang M, Kessing BD, Lautenberger JA, Troyer JL, Malasky MJ, McIntosh C, Kirk GD, Wolinsky SM, Buchbinder SP, Gomperts ED, Goedert JJ, O'Brien SJ. Genetic associations of variants in genes encoding HIV-dependency factors required for HIV-1 infection. J Infect Dis 2010; 202:1836-45. [PMID: 21083371 PMCID: PMC3107555 DOI: 10.1086/657322] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Accepted: 07/14/2010] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND High-throughput genome-wide techniques have facilitated the identification of previously unknown host proteins involved in cellular human immunodeficiency virus (HIV) infection. Recently, 3 independent studies have used small interfering RNA technology to silence each gene in the human genome to determine the importance of each in HIV infection. Genes conferring a significant effect were termed HIV-dependency factors (HDFs). METHODS We assembled high-density panels of 6380 single-nucleotide polymorphisms (SNPs) in 278 HDF genes and tested for genotype associations with HIV infection and AIDS progression in 1633 individuals from clinical AIDS cohorts. RESULTS After statistical correction for multiple tests, significant associations with HIV acquisition were found for SNPs in 2 genes, NCOR2 and IDH1. Weaker associations with AIDS progression were revealed for SNPs within the TM9SF2 and EGFR genes. CONCLUSIONS This study independently verifies the influence of NCOR2 and IDH1 on HIV transmission, and its findings suggest that variation in these genes affects susceptibility to HIV infection in exposed individuals.
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Affiliation(s)
| | | | | | | | | | | | | | - Gregory D. Kirk
- Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | | | | | - Edward D. Gomperts
- Childrens Hospital Los Angeles and University of Southern California, Los Angeles, California
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Hegelund JN, Jahn TP, Baekgaard L, Palmgren MG, Schjoerring JK. Transmembrane nine proteins in yeast and Arabidopsis affect cellular metal contents without changing vacuolar morphology. PHYSIOLOGIA PLANTARUM 2010; 140:355-367. [PMID: 20681974 DOI: 10.1111/j.1399-3054.2010.01404.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Transmembrane nine (TM9) proteins are localized in the secretory pathway of eukaryotic cells and are involved in cell adhesion and phagocytosis. The mechanism by which TM9 proteins operate is, however, not well understood. Here we have utilized elemental profiling by inductively coupled plasma mass spectrometry (ICP-MS) to further investigate the physiological function of TM9 proteins. Cellular copper contents in Saccharomyces cerevisiae varied depending on the presence of TM9 homologues from both yeast and Arabidopsis thaliana. A yeast tmn1-3 triple mutant lacking all three yeast endogenous TMNs showed altered metal homeostasis with a reduction in the cellular Cu contents to 25% of that in the wild-type. Conversely, when TMN1 was overexpressed in yeast, cellular Cu concentrations were more than doubled. Both Tmn1p-GFP and Tmn2p-GFP fusion proteins localized to the tonoplast. Yeast vacuolar biogenesis was not affected by the lack or presence of TM9 proteins neither in the tmn1-3 triple mutant nor in TM9 overexpressing strains. Heterologous expression in yeast of AtTMN7, a TM9 homologue from Arabidopsis, affected Cu homeostasis similar to the overexpression of TMN1. In Arabidopsis, the two TM9 homologues AtTMN1 and AtTMN7 were ubiquitously expressed. AtTMN7 promoter constructs driving the expression of GFP showed elevated expression of AtTMN7 in the root elongation zone. It is concluded that TM9 homologues from S. cerevisiae and A. thaliana have the ability to affect the intracellular Cu balance. Tmn1p and Tmn2p operate from the yeast vacuolar membrane without influencing vacuolar biogenesis. A new physiological function of the TM9 family coupled to vacuolar Cu homeostasis is proposed.
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Affiliation(s)
- Josefine N Hegelund
- Plant and Soil Science, Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
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Comparative analysis of nonaspanin protein sequences and expression studies in zebrafish. Immunogenetics 2010; 62:681-99. [PMID: 20820770 DOI: 10.1007/s00251-010-0472-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Accepted: 08/09/2010] [Indexed: 10/19/2022]
Abstract
Nonaspanins constitute a family of proteins, also called TM9SF, characterized by a large non-cytoplasmic domain and nine putative transmembrane domains. This family is highly conserved through evolution and comprises three members in Saccharomyces cerevisiae, Dictyostelium discoideum, and Drosophila melanogaster, and four members are reported in mammals (TM9SF1-TM9SF4). Genetic studies in Dictyostelium and Drosophila have shown that TM9SF members are required for adhesion and phagocytosis in innate immune response, furthermore, human TM9SF1 plays a role in the regulation of autophagy and human TM9SF4 in tumor cannibalism. Here we report that the zebrafish genome encodes five members of this family, TM9SF1-TM9SF5, which show high level of sequence conservation with the previously reported members. Expression analysis in zebrafish showed that all members are maternally expressed and continue to be present throughout embryogenesis to adults. Gene expression could not be regulated by pathogen-associated molecular patterns such as LPS, CpG, or Poly I:C. By bioinformatic analyses of 80 TM9SF protein sequences from yeast, plants, and animals, we confirmed a very conserved protein structure. An evolutionary conserved immunoreceptor tyrosine-based inhibition motif has been detected in the cytoplasmic domain between transmembrane domain (TM) 7 and TM8 in TM9SF1, TM9SF2, TM9SF4 and TM9SF5, and at the extreme C-terminal end of TM9SF4. Finally, a conserved TRAF2 binding domain could also be predicted in the cytoplasmic regions of TM9SF2, TM9SF3, TM9SF4, and TM9SF5. This confirms the hypothesis that TM9SF proteins may play a regulatory role in a specific and ancient cellular mechanism that is involved in innate immunity.
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MacKinnon RN, Selan C, Wall M, Baker E, Nandurkar H, Campbell LJ. The paradox of 20q11.21 amplification in a subset of cases of myeloid malignancy with chromosome 20 deletion. Genes Chromosomes Cancer 2010; 49:998-1013. [DOI: 10.1002/gcc.20806] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Avet-Rochex A, Boyer K, Polesello C, Gobert V, Osman D, Roch F, Augé B, Zanet J, Haenlin M, Waltzer L. An in vivo RNA interference screen identifies gene networks controlling Drosophila melanogaster blood cell homeostasis. BMC DEVELOPMENTAL BIOLOGY 2010; 10:65. [PMID: 20540764 PMCID: PMC2891661 DOI: 10.1186/1471-213x-10-65] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Accepted: 06/11/2010] [Indexed: 12/31/2022]
Abstract
BACKGROUND In metazoans, the hematopoietic system plays a key role both in normal development and in defense of the organism. In Drosophila, the cellular immune response involves three types of blood cells: plasmatocytes, crystal cells and lamellocytes. This last cell type is barely present in healthy larvae, but its production is strongly induced upon wasp parasitization or in mutant contexts affecting larval blood cell homeostasis. Notably, several zygotic mutations leading to melanotic mass (or "tumor") formation in larvae have been associated to the deregulated differentiation of lamellocytes. To gain further insights into the gene regulatory network and the mechanisms controlling larval blood cell homeostasis, we conducted a tissue-specific loss of function screen using hemocyte-specific Gal4 drivers and UAS-dsRNA transgenic lines. RESULTS By targeting around 10% of the Drosophila genes, this in vivo RNA interference screen allowed us to recover 59 melanotic tumor suppressor genes. In line with previous studies, we show that melanotic tumor formation is associated with the precocious differentiation of stem-cell like blood progenitors in the larval hematopoietic organ (the lymph gland) and the spurious differentiation of lamellocytes. We also find that melanotic tumor formation can be elicited by defects either in the fat body, the embryo-derived hemocytes or the lymph gland. In addition, we provide a definitive confirmation that lymph gland is not the only source of lamellocytes as embryo-derived plasmatocytes can differentiate into lamellocytes either upon wasp infection or upon loss of function of the Friend of GATA cofactor U-shaped. CONCLUSIONS In this study, we identify 55 genes whose function had not been linked to blood cell development or function before in Drosophila. Moreover our analyses reveal an unanticipated plasticity of embryo-derived plasmatocytes, thereby shedding new light on blood cell lineage relationship, and pinpoint the Friend of GATA transcription cofactor U-shaped as a key regulator of the plasmatocyte to lamellocyte transformation.
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Affiliation(s)
- Amélie Avet-Rochex
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
- King's College London, Guy's Campus, London SE1 1UL, UK
| | - Karène Boyer
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Cédric Polesello
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Vanessa Gobert
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Dani Osman
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Fernando Roch
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Benoit Augé
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Jennifer Zanet
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
- King's College London, Guy's Campus, London SE1 1UL, UK
| | - Marc Haenlin
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
| | - Lucas Waltzer
- Université de Toulouse, UPS, CBD (Centre de Biologie du Développement), Bât4R3, 118 route de Narbonne, 31062 Toulouse, France
- CNRS, CBD UMR5547, 31062 Toulouse, France
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The human homologue of Dictyostelium discoideum phg1A is expressed by human metastatic melanoma cells. EMBO Rep 2009; 10:1348-54. [PMID: 19893578 DOI: 10.1038/embor.2009.236] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 09/17/2009] [Accepted: 09/23/2009] [Indexed: 01/11/2023] Open
Abstract
Tumour cannibalism is a characteristic of malignancy and metastatic behaviour. This atypical phagocytic activity is a crucial survival option for tumours in conditions of low nutrient supply, and has some similarities to the phagocytic activity of unicellular microorganisms. In fact, Dictyostelium discoideum has been used widely as a model to study phagocytosis. Recently, phg1A has been described as a protein that is primarily involved in the phagocytic process of this microorganism. The closest human homologue to phg1A is transmembrane 9 superfamily protein member 4 (TM9SF4). Here, we report that TM9SF4 is highly expressed in human malignant melanoma cells deriving from metastatic lesions, whereas it is undetectable in healthy human tissues and cells. TM9SF4 is predominantly expressed in acidic vesicles of melanoma cells, in which it co-localizes with the early endosome antigens Rab5 and early endosome antigen 1. TM9SF4 silencing induced marked inhibition of cannibal activity, which is consistent with a derangement of intracellular pH gradients, with alkalinization of acidic vesicles and acidification of the cell cytosol. We propose TM9SF4 as a new marker of malignancy, representing a potential new target for anti-tumour strategies with a specific role in tumour cannibalism and in the establishment of a metastatic phenotype.
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