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Li Q, Fang J, Liu K, Luo P, Wang X. Multi-omic validation of the cuproptosis-sphingolipid metabolism network: modulating the immune landscape in osteosarcoma. Front Immunol 2024; 15:1424806. [PMID: 38983852 PMCID: PMC11231095 DOI: 10.3389/fimmu.2024.1424806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Accepted: 06/06/2024] [Indexed: 07/11/2024] Open
Abstract
Background The current understanding of the mechanisms by which metal ion metabolism promotes the progression and drug resistance of osteosarcoma remains incomplete. This study aims to elucidate the key roles and mechanisms of genes involved in cuproptosis-related sphingolipid metabolism (cuproptosis-SPGs) in regulating the immune landscape, tumor metastasis, and drug resistance in osteosarcoma cells. Methods This study employed multi-omics approaches to assess the impact of cuproptosis-SPGs on the prognosis of osteosarcoma patients. Lasso regression analysis was utilized to construct a prognostic model, while multivariate regression analysis was applied to identify key core genes and generate risk coefficients for these genes, thereby calculating a risk score for each osteosarcoma patient. Patients were then stratified into high-risk and low-risk groups based on their risk scores. The ESTIMATE and CIBERSORT algorithms were used to analyze the level of immune cell infiltration within these risk groups to construct the immune landscape. Single-cell analysis was conducted to provide a more precise depiction of the expression patterns of cuproptosis-SPGs among immune cell subtypes. Finally, experiments on osteosarcoma cells were performed to validate the role of the cuproptosis-sphingolipid signaling network in regulating cell migration and apoptosis. Results In this study, seven cuproptosis-SPGs were identified and used to construct a prognostic model for osteosarcoma patients. In addition to predicting survival, the model also demonstrated reliability in forecasting the response to chemotherapy drugs. The results showed that a high cuproptosis-sphingolipid metabolism score was closely associated with reduced CD8 T cell infiltration and indicated poor prognosis in osteosarcoma patients. Cellular functional assays revealed that cuproptosis-SPGs regulated the LC3B/ERK signaling pathway, thereby triggering cell death and impairing migration capabilities in osteosarcoma cells. Conclusion The impact of cuproptosis-related sphingolipid metabolism on the survival and migration of osteosarcoma cells, as well as on CD8 T cell infiltration, highlights the potential of targeting copper ion metabolism as a promising strategy for osteosarcoma patients.
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Affiliation(s)
- Qingbiao Li
- Department of Orthopedics, Southern Medical University Pingshan Hospital (Pingshan District Peoples’ Hospital of Shenzhen), Shenzhen, Guangdong, China
| | - Jiarui Fang
- Department of Sport Medicine, Huazhong University of Science and Technology Union Shenzhen Hospital (Nanshan Hospital), Shenzhen, China
| | - Kai Liu
- Department of Sport Medicine, Huazhong University of Science and Technology Union Shenzhen Hospital (Nanshan Hospital), Shenzhen, China
| | - Peng Luo
- Department of Sport Medicine, Huazhong University of Science and Technology Union Shenzhen Hospital (Nanshan Hospital), Shenzhen, China
| | - Xiuzhuo Wang
- Department of Orthopedics, Southern Medical University Pingshan Hospital (Pingshan District Peoples’ Hospital of Shenzhen), Shenzhen, Guangdong, China
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2
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Tachibana H, Minoura K, Omachi T, Nagao K, Ichikawa T, Kimura Y, Kono N, Shimanaka Y, Arai H, Ueda K, Kioka N. The plasma membrane of focal adhesions has a high content of cholesterol and phosphatidylcholine with saturated acyl chains. J Cell Sci 2023; 136:jcs260763. [PMID: 37470177 DOI: 10.1242/jcs.260763] [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: 11/02/2022] [Accepted: 07/12/2023] [Indexed: 07/21/2023] Open
Abstract
Cellular functions, such as differentiation and migration, are regulated by the extracellular microenvironment, including the extracellular matrix (ECM). Cells adhere to ECM through focal adhesions (FAs) and sense the surrounding microenvironments. Although FA proteins have been actively investigated, little is known about the lipids in the plasma membrane at FAs. In this study, we examine the lipid composition at FAs with imaging and biochemical approaches. Using the cholesterol-specific probe D4 with total internal reflection fluorescence microscopy and super-resolution microscopy, we show an enrichment of cholesterol at FAs simultaneously with FA assembly. Furthermore, we establish a method to isolate the lipid from FA-rich fractions, and biochemical quantification of the lipids reveals that there is a higher content of cholesterol and phosphatidylcholine with saturated fatty acid chains in the lipids of the FA-rich fraction than in either the plasma membrane fraction or the whole-cell membrane. These results demonstrate that plasma membrane at FAs has a locally distinct lipid composition compared to the bulk plasma membrane.
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Affiliation(s)
- Hiroshi Tachibana
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Kodai Minoura
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Tomohiro Omachi
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Kohjiro Nagao
- Department of Biophysical Chemistry, Kyoto Pharmaceutical University, Yamashina, Kyoto 607-8414, Japan
| | - Takafumi Ichikawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Yasuhisa Kimura
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Nozomu Kono
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Yuta Shimanaka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Hiroyuki Arai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Kazumitsu Ueda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo, Kyoto 606-8507, Japan
| | - Noriyuki Kioka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo, Kyoto 606-8507, Japan
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3
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Mitani F, Hayasaka R, Hirayama A, Oneyama C. SNAP23-Mediated Perturbation of Cholesterol-Enriched Membrane Microdomain Promotes Extracellular Vesicle Production in Src-Activated Cancer Cells. Biol Pharm Bull 2022; 45:1572-1580. [PMID: 36184518 DOI: 10.1248/bpb.b22-00560] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Extracellular vesicles (EVs) originating from intraluminal vesicles (ILVs) formed within multivesicular bodies (MVBs), often referred to as small EV (sEV) or exosomes, are aberrantly produced by cancer cells and regulate the tumor microenvironment. The tyrosine kinase c-Src is upregulated in a wide variety of human cancers and is involved in promoting sEV secretion, suggesting its role in malignant progression. In this study, we found that activated Src liberated synaptosomal-associated protein 23 (SNAP23), a SNARE molecule, from lipid rafts to non-rafts on cellular membrane. We also demonstrated that SNAP23 localized in non-rafts induced cholesterol downregulation and ILV formation, resulting in the upregulation of sEV production in c-Src-transformed cells. Furthermore, the contribution of the SNAP23-cholesterol axis on sEV upregulation was confirmed in pancreatic cancer cells. High SNAP23 expression is associated with poor prognosis in patients with pancreatic cancer. These findings suggest a unique mechanism for the upregulation of sEV production via SNAP23-mediated cholesterol downregulation in Src-activated cancer cells.
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Affiliation(s)
- Fumie Mitani
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute.,Department of Oncology, Graduate School of Pharmaceutical Sciences, Nagoya City University
| | - Ryosuke Hayasaka
- Institute for Advanced Biosciences, Keio University.,Systems Biology Program, Graduate School of Media and Governance, Keio University
| | - Akiyoshi Hirayama
- Institute for Advanced Biosciences, Keio University.,Systems Biology Program, Graduate School of Media and Governance, Keio University.,Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University
| | - Chitose Oneyama
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute.,Department of Oncology, Graduate School of Pharmaceutical Sciences, Nagoya City University.,Department of Target and Drug Discovery, Graduate School of Medicine, Nagoya University
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4
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Lunghi G, Carsana EV, Loberto N, Cioccarelli L, Prioni S, Mauri L, Bassi R, Duga S, Straniero L, Asselta R, Soldà G, Di Fonzo A, Frattini E, Magni M, Liessi N, Armirotti A, Ferrari E, Samarani M, Aureli M. β-Glucocerebrosidase Deficiency Activates an Aberrant Lysosome-Plasma Membrane Axis Responsible for the Onset of Neurodegeneration. Cells 2022; 11:cells11152343. [PMID: 35954187 PMCID: PMC9367513 DOI: 10.3390/cells11152343] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/25/2022] [Accepted: 07/27/2022] [Indexed: 02/06/2023] Open
Abstract
β-glucocerebrosidase is a lysosomal hydrolase involved in the catabolism of the sphingolipid glucosylceramide. Biallelic loss of function mutations in this enzyme are responsible for the onset of Gaucher disease, while monoallelic β-glucocerebrosidase mutations represent the first genetic risk factor for Parkinson’s disease. Despite this evidence, the molecular mechanism linking the impairment in β-glucocerebrosidase activity with the onset of neurodegeneration in still unknown. In this frame, we developed two in vitro neuronal models of β-glucocerebrosidase deficiency, represented by mouse cerebellar granule neurons and human-induced pluripotent stem cells-derived dopaminergic neurons treated with the specific β-glucocerebrosidase inhibitor conduritol B epoxide. Neurons deficient for β-glucocerebrosidase activity showed a lysosomal accumulation of glucosylceramide and the onset of neuronal damage. Moreover, we found that neurons react to the lysosomal impairment by the induction of their biogenesis and exocytosis. This latter event was responsible for glucosylceramide accumulation also at the plasma membrane level, with an alteration in lipid and protein composition of specific signaling microdomains. Collectively, our data suggest that β-glucocerebrosidase loss of function impairs the lysosomal compartment, establishing a lysosome–plasma membrane axis responsible for modifications in the plasma membrane architecture and possible alterations of intracellular signaling pathways, leading to neuronal damage.
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Affiliation(s)
- Giulia Lunghi
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Emma Veronica Carsana
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Nicoletta Loberto
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Laura Cioccarelli
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Simona Prioni
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Laura Mauri
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Rosaria Bassi
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
| | - Stefano Duga
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (S.D.); (L.S.); (R.A.); (G.S.)
- Humanitas Clinical and Research Center—IRCCS, Via Manzoni 56, 20072 Milan, Italy
| | - Letizia Straniero
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (S.D.); (L.S.); (R.A.); (G.S.)
- Humanitas Clinical and Research Center—IRCCS, Via Manzoni 56, 20072 Milan, Italy
| | - Rosanna Asselta
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (S.D.); (L.S.); (R.A.); (G.S.)
- Humanitas Clinical and Research Center—IRCCS, Via Manzoni 56, 20072 Milan, Italy
| | - Giulia Soldà
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (S.D.); (L.S.); (R.A.); (G.S.)
- Humanitas Clinical and Research Center—IRCCS, Via Manzoni 56, 20072 Milan, Italy
| | - Alessio Di Fonzo
- IRCCS Foundation Ca’ Granda Ospedale Maggiore Policlinico, Dino Ferrari Center, Neuroscience Section, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy; (A.D.F.); (E.F.); (M.M.)
| | - Emanuele Frattini
- IRCCS Foundation Ca’ Granda Ospedale Maggiore Policlinico, Dino Ferrari Center, Neuroscience Section, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy; (A.D.F.); (E.F.); (M.M.)
| | - Manuela Magni
- IRCCS Foundation Ca’ Granda Ospedale Maggiore Policlinico, Dino Ferrari Center, Neuroscience Section, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy; (A.D.F.); (E.F.); (M.M.)
| | - Nara Liessi
- Analytical Chemistry Facility, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy; (N.L.); (A.A.)
| | - Andrea Armirotti
- Analytical Chemistry Facility, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy; (N.L.); (A.A.)
| | - Elena Ferrari
- Department of Pharmacological and Biomolecular Sciences, University of Milan, 20133 Milan, Italy;
| | - Maura Samarani
- Department of Cell Biology and Infection, Institut Pasteur, 75015 Paris, France;
| | - Massimo Aureli
- Department of Medical Biotechnology and Translational Medicine, University of Milan, 20054 Milan, Italy; (G.L.); (E.V.C.); (N.L.); (L.C.); (S.P.); (L.M.); (R.B.)
- Correspondence: ; Tel.: +39-025-033-0364
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5
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Kajiwara K, Chen PK, Abe Y, Okuda S, Kon S, Adachi J, Tomonaga T, Fujita Y, Okada M. Src activation in lipid rafts confers epithelial cells with invasive potential to escape from apical extrusion during cell competition. Curr Biol 2022; 32:3460-3476.e6. [PMID: 35809567 DOI: 10.1016/j.cub.2022.06.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/28/2022] [Accepted: 06/13/2022] [Indexed: 11/25/2022]
Abstract
Abnormal/cancerous cells within healthy epithelial tissues undergo apical extrusion to protect against carcinogenesis, although they acquire invasive capacity once carcinogenesis progresses. However, the molecular mechanisms by which cancer cells escape from apical extrusion and invade surrounding tissues remain elusive. In this study, we demonstrate a molecular mechanism for cell fate switching during epithelial cell competition. We found that during competition within epithelial cell layers, Src transformation promotes maturation of focal adhesions and degradation of extracellular matrix. Src-transformed cells underwent basal delamination by Src activation within sphingolipid/cholesterol-enriched membrane microdomains/lipid rafts, whereas they were apically extruded when Src was outside of lipid rafts. A comparative analysis of contrasting phenotypes revealed that activation of the Src-STAT3-MMP axis through lipid rafts was required for basal delamination. CUB-domain-containing protein 1 (CDCP1) was identified as an Src-activating scaffold and as a Met regulator in lipid rafts, and its overexpression induced basal delamination. In renal cancer models, CDCP1 promoted epithelial-mesenchymal transition-mediated invasive behavior by activating the Src-STAT3-MMP axis through Met activation. Overall, these results suggest that spatial activation of Src signaling in lipid rafts confers resistance to apical extrusion and invasive potential on epithelial cells to promote carcinogenesis.
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Affiliation(s)
- Kentaro Kajiwara
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan.
| | - Ping-Kuan Chen
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
| | - Yuichi Abe
- Laboratory of Proteome Research, National Institute of Biomedical Innovation, Health and Nutrition, Osaka 567-0085, Japan; Division of Molecular Diagnosis, Aichi Cancer Center Research Institute, Aichi 464-8681, Japan
| | - Satoru Okuda
- World Premier International Nano Life Science Institute, Kanazawa University, Kanazawa 920-1192, Japan
| | - Shunsuke Kon
- Division of Development and Aging, Research Institute for Biomedical Sciences, Tokyo University of Science, Chiba 278-0022, Japan
| | - Jun Adachi
- Laboratory of Proteome Research, National Institute of Biomedical Innovation, Health and Nutrition, Osaka 567-0085, Japan
| | - Takeshi Tomonaga
- Laboratory of Proteome Research, National Institute of Biomedical Innovation, Health and Nutrition, Osaka 567-0085, Japan
| | - Yasuyuki Fujita
- Department of Molecular Oncology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
| | - Masato Okada
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan; World Premier International Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan; Center for Infectious Diseases Education and Research, Osaka University, Osaka 565-0871, Japan.
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6
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Kajiwara K, Yamano S, Aoki K, Okuzaki D, Matsumoto K, Okada M. CDCP1 promotes compensatory renal growth by integrating Src and Met signaling. Life Sci Alliance 2021; 4:4/4/e202000832. [PMID: 33574034 PMCID: PMC7893822 DOI: 10.26508/lsa.202000832] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 01/07/2021] [Accepted: 01/19/2021] [Indexed: 12/15/2022] Open
Abstract
CDCP1 promotes HGF-induced compensatory renal growth by focally and temporally integrating Src and Met-STAT3 signaling in lipid rafts. Compensatory growth of organs after loss of their mass and/or function is controlled by hepatocyte growth factor (HGF), but the underlying regulatory mechanisms remain elusive. Here, we show that CUB domain-containing protein 1 (CDCP1) promotes HGF-induced compensatory renal growth. Using canine kidney cells as a model of renal tubules, we found that HGF-induced temporal up-regulation of Src activity and its scaffold protein, CDCP1, and that the ablation of CDCP1 robustly abrogated HGF-induced phenotypic changes, such as morphological changes and cell growth/proliferation. Mechanistic analyses revealed that up-regulated CDCP1 recruits Src into lipid rafts to activate STAT3 associated with the HGF receptor Met, and activated STAT3 induces the expression of matrix metalloproteinases and mitogenic factors. After unilateral nephrectomy in mice, the Met-STAT3 signaling is transiently up-regulated in the renal tubules of the remaining kidney, whereas CDCP1 ablation attenuates regenerative signaling and significantly suppresses compensatory growth. These findings demonstrate that CDCP1 plays a crucial role in controlling compensatory renal growth by focally and temporally integrating Src and Met signaling.
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Affiliation(s)
- Kentaro Kajiwara
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Shotaro Yamano
- Japan Bioassay Research Center, Japan Organization of Occupational Health and Safety, Kanagawa, Japan
| | - Kazuhiro Aoki
- Division of Quantitative Biology, Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Aichi, Japan
| | - Daisuke Okuzaki
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Kunio Matsumoto
- Division of Tumor Dynamics and Regulation, Cancer Research Institute, Kanazawa University, Kanazawa, Japan
| | - Masato Okada
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
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7
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Roy KR, Uddin MB, Roy SC, Hill RA, Marshall J, Li Y, Chamcheu JC, Lu H, Liu Y. Gb3-cSrc complex in glycosphingolipid-enriched microdomains contributes to the expression of p53 mutant protein and cancer drug resistance via β-catenin-activated RNA methylation. FASEB Bioadv 2020; 2:653-667. [PMID: 33205006 PMCID: PMC7655095 DOI: 10.1096/fba.2020-00044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/07/2020] [Accepted: 08/10/2020] [Indexed: 12/11/2022] Open
Abstract
Glucosylceramide synthase (GCS) is a key enzyme catalyzing ceramide glycosylation to generate glucosylceramide (GlcCer), which in turn serves as the precursor for cells to produce glycosphingolipids (GSLs). In cell membranes, GSLs serve as essential components of GSL-enriched microdomains (GEMs) and mediate membrane functions and cell behaviors. Previous studies showed that ceramide glycosylation correlates with upregulated expression of p53 hotspot mutant R273H and cancer drug resistance. Yet, the underlying mechanisms remain elusive. We report herewith that globotriaosylceramide (Gb3) is associated with cSrc kinase in GEMs and plays a crucial role in modulating expression of p53 R273H mutant and drug resistance. Colon cancer cell lines, either WiDr homozygous for missense-mutated TP53 (R273H+/+) or SW48/TP53-Dox bearing heterozygous TP53 mutant (R273H/+), display drug resistance with increased ceramide glycosylation. Inhibition of GCS with Genz-161 (GENZ 667161) resensitized cells to apoptosis in these p53 mutant-carrying cancer cells. Genz-161 effectively inhibited GCS activity, and substantially suppressed the elevated Gb3 levels seen in GEMs of p53-mutant cells exposed to doxorubicin. Complex formation between Gb3 and cSrc in GEMs to activate β-catenin was detected in both cultured cells and xenograft tumors. Suppression of ceramide glycosylation significantly decreased Gb3-cSrc in GEMs, β-catenin, and methyltransferase-like 3 for m6A RNA methylation, thus altering pre-mRNA splicing, resulting in upregulated expression of wild-type p53 protein, but not mutants, in cells carrying p53 R273H. Altogether, increased Gb3-cSrc complex in GEMs of membranes in response to anticancer drug induced cell stress promotes expression of p53 mutant proteins and accordant cancer drug resistance.
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Affiliation(s)
- Kartik R. Roy
- School of Basic Pharmaceutical and Toxicological SciencesCollege of PharmacyUniversity of Louisiana at MonroeMonroeLouisianaUSA
| | - Mohammad B. Uddin
- School of Basic Pharmaceutical and Toxicological SciencesCollege of PharmacyUniversity of Louisiana at MonroeMonroeLouisianaUSA
| | - Sagor C. Roy
- School of Basic Pharmaceutical and Toxicological SciencesCollege of PharmacyUniversity of Louisiana at MonroeMonroeLouisianaUSA
| | - Ronald A. Hill
- School of Basic Pharmaceutical and Toxicological SciencesCollege of PharmacyUniversity of Louisiana at MonroeMonroeLouisianaUSA
| | - John Marshall
- Department of Rare Genetic Disease ResearchSanofi‐Genzyme R&D CenterGenzyme, FraminghamMassachusettsUSA
| | - Yu‐Teh Li
- Department of Biochemistry and Molecular BiologyTulane University School of MedicineNew OrleansLouisianaUSA
| | - Jean Christopher Chamcheu
- School of Basic Pharmaceutical and Toxicological SciencesCollege of PharmacyUniversity of Louisiana at MonroeMonroeLouisianaUSA
| | - Hua Lu
- Department of Biochemistry and Molecular BiologyTulane University School of MedicineNew OrleansLouisianaUSA
| | - Yong‐Yu Liu
- School of Basic Pharmaceutical and Toxicological SciencesCollege of PharmacyUniversity of Louisiana at MonroeMonroeLouisianaUSA
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8
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Honda T, Motoyoshi K, Kasahara J, Yamagata K, Takahashi H, Nakamura H, Murayama T. Tyrosine-phosphorylation and activation of glucosylceramide synthase by v-Src: Its role in survival of HeLa cells against ceramide. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1866:158817. [PMID: 32980536 DOI: 10.1016/j.bbalip.2020.158817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/15/2020] [Accepted: 09/18/2020] [Indexed: 10/23/2022]
Abstract
Sphingolipids represent a family of cellular lipid-molecules that regulate physiological and pathophysiological processes. Glucosylceramide (GlcCer), the simplest glycosphingolipid (GSL), is synthesized from ceramide and UDP-glucose by GlcCer synthase (GCS). Both GlcCer (and resulting GSLs) and ceramide regulate various cellular functions including cell death and multiple drug resistance. Src family tyrosine kinases are up-regulated in various human cancer cells. We examined the effect of v-Src expression on GCS activity, the formation of 4-nitrobenzo-2-oxa-1,3-diazole (NBD)-labeled GlcCer from NBD-ceramide, and the effect of tyrosine132 mutation in GCS on ceramide-induced cytotoxicity in HeLa cells. Expression of v-Src increased the formation of NBD-GlcCer in both intact cells without marked changes in other sphingolipid metabolites and cell homogenates without changing affinities of NBD-ceramide and UDP-glucose. Expression of v-Src also increased tyrosine-phosphorylated levels in GCS proteins in HeLa and HEK293T cells. In HEK293T cells transiently expressing the GCS mutant, GCS-Y132F-HA, showing replacement of the tyrosine132 residue with phenylalanine, tyrosine-phosphorylated levels in GCS proteins were significantly lower than those in control cells expressing the GCS-wild-type-HA. The formation of NBD-GlcCer in HeLa cells stably expressing GCS-Y132F-HA was significantly lower than that in the control. Ceramide-induced cytotoxicity in HeLa-GCS-Y132F-HA cells was significantly greater than in the control. In this study, we showed for the first time that expression of v-Src up-regulated GCS activity via tyrosine phosphorylation of the enzyme in a post-translational manner. Mechanisms of Src-induced resistance to ceramide-induced cytotoxicity are discussed in relation to the Src-induced up-regulation of GCS activity.
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Affiliation(s)
- Takuya Honda
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan.
| | - Kaisei Motoyoshi
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Junya Kasahara
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Kazuyuki Yamagata
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan; Laboratory of International Scholars in Pharmaceuticals/Systems Biology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Hiromasa Takahashi
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Hiroyuki Nakamura
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Toshihiko Murayama
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
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9
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Tanaka K, Ito Y, Kajiwara K, Nada S, Okada M. Ubiquitination of Src promotes its secretion via small extracellular vesicles. Biochem Biophys Res Commun 2020; 525:S0006-291X(20)30325-9. [PMID: 32085898 DOI: 10.1016/j.bbrc.2020.02.057] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 02/09/2020] [Indexed: 01/08/2023]
Abstract
Upregulation of the Src tyrosine kinase is implicated in the progression of cancer. The oncogenic potential of Src is suppressed via several negative regulation systems including degradation via the ubiquitin-proteasome pathway. Here, we show that ubiquitination of Src promotes its secretion via small extracellular vesicles (sEVs) to suppress its oncogenic potential. In MDCK cells expressing a modified Src that can be activated by hydroxytamoxifen, activated Src was transported to late endosomes/lysosomes and secreted via sEVs. The secretion of Src was suppressed by ablation of Cbl E3-ligase, suggesting the contribution of ubiquitination to this process. Activated Src was ubiquitinated at multiple sites, and Lys429 was identified as a critical site for sEV-mediated secretion. Mutation of Src at Lys429 (R429) caused resistance to ubiquitination and decreased its secretion via sEVs. The activated R429 mutant was also transported to late endosomes/lysosomes, whereas its incorporation into intraluminal vesicles was reduced. Activation of the R429 mutant induced a greater FAK activation than that of wild-type Src, thereby potentiating Src-induced invasive phenotypes, such as invadopodia formation and invasive activity. These findings demonstrate that ubiquitination of activated Src at Lys429 promotes its secretion via sEVs, suggesting a potential strategy to suppress the oncogenic function of upregulated Src.
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Affiliation(s)
- Kentaro Tanaka
- Department of Oncogene Research, Research Institute for Microbial Diseases, 3-1 Yamadaoka, Suita, Osaka University, Osaka, 565-0871, Japan
| | - Yuko Ito
- Department of General and Gastroenterological Surgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki, Osaka, 569-8686, Japan
| | - Kentaro Kajiwara
- Department of Oncogene Research, Research Institute for Microbial Diseases, 3-1 Yamadaoka, Suita, Osaka University, Osaka, 565-0871, Japan
| | - Shigeyuki Nada
- Department of Oncogene Research, Research Institute for Microbial Diseases, 3-1 Yamadaoka, Suita, Osaka University, Osaka, 565-0871, Japan
| | - Masato Okada
- Department of Oncogene Research, Research Institute for Microbial Diseases, 3-1 Yamadaoka, Suita, Osaka University, Osaka, 565-0871, Japan.
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10
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Okuzaki D, Yamauchi T, Mitani F, Miyata M, Ninomiya Y, Watanabe R, Akamatsu H, Oneyama C. c-Src promotes tumor progression through downregulation of microRNA-129-1-3p. Cancer Sci 2020; 111:418-428. [PMID: 31799727 PMCID: PMC7004518 DOI: 10.1111/cas.14269] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 11/20/2019] [Accepted: 11/27/2019] [Indexed: 12/31/2022] Open
Abstract
MicroRNAs (miRNAs) fine‐tune cellular signaling by regulating expression of signaling proteins, and aberrant expression of miRNAs is observed in many cancers. The tyrosine kinase c‐Src is upregulated in various human cancers, but the molecular mechanisms underlying c‐Src‐mediated tumor progression remain unclear. In previous investigations of miRNA‐mediated control of c‐Src‐related oncogenic pathways, we identified miRNAs that were downregulated in association with c‐Src transformation and uncovered the signaling networks by predicting their target genes, which might act cooperatively to control tumor progression. Here, to further elucidate the process of cell transformation driven by c‐Src, we analyzed the expression profiles of miRNAs in a doxycycline‐inducible Src expression system. We found that miRNA (miR)‐129‐1‐3p was downregulated in the early phase of c‐Src‐induced cell transformation, and that reexpression of miR‐129‐1‐3p disrupted c‐Src‐induced cell transformation. In addition, miR‐129‐1‐3p downregulation was tightly associated with tumor progression in human colon cancer cells/tissues. Expression of miR‐129‐1‐3p in human colon cancer cells caused morphological changes and suppressed tumor growth, cell adhesion, and invasion. We also identified c‐Src and its critical substrate Fer, and c‐Yes, a member of the Src family of kinases, as novel targets of miR‐129‐1‐3p. Furthermore, we found that miR‐129‐1‐3p‐mediated regulation of c‐Src/Fer and c‐Yes is important for controlling cell adhesion and invasion. Downregulation of miR‐129‐1‐3p by early activation of c‐Src increases expression of these target genes and synergistically promotes c‐Src‐related oncogenic signaling. Thus, c‐Src‐miR‐129‐1‐3p circuits serve as critical triggers for tumor progression in many human cancers that harbor upregulation of c‐Src.
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Affiliation(s)
- Daisuke Okuzaki
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Suita, Japan
| | - Tomoe Yamauchi
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Fumie Mitani
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Mamiko Miyata
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Yuichi Ninomiya
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Risayo Watanabe
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute, Nagoya, Japan
| | | | - Chitose Oneyama
- Division of Cancer Cell Regulation, Aichi Cancer Center Research Institute, Nagoya, Japan
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11
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Kim S, Yang X, Yin A, Zha J, Beharry Z, Bai A, Bielawska A, Bartlett MG, Yin H, Cai H. Dietary palmitate cooperates with Src kinase to promote prostate tumor progression. Prostate 2019; 79:896-908. [PMID: 30900312 PMCID: PMC6502658 DOI: 10.1002/pros.23796] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 02/14/2019] [Accepted: 02/28/2019] [Indexed: 12/14/2022]
Abstract
Numerous genetic alterations have been identified during prostate cancer progression. The influence of environmental factors, particularly the diet, on the acceleration of tumor progression is largely unknown. Expression levels and/or activity of Src kinase are highly elevated in numerous cancers including advanced stages of prostate cancer. In this study, we demonstrate that high-fat diets (HFDs) promoted pathological transformation mediated by the synergy of Src and androgen receptor in vivo. Additionally, a diet high in saturated fat significantly enhanced proliferation of Src-mediated xenograft tumors in comparison with a diet high in unsaturated fat. The saturated fatty acid palmitate, a major constituent in a HFD, significantly upregulated the biosynthesis of palmitoyl-CoA in cancer cells in vitro and in xenograft tumors in vivo. The exogenous palmitate enhanced Src-dependent mitochondrial β-oxidation. Additionally, it elevated the amount of C16-ceramide and total saturated ceramides, increased the level of Src kinase localized in the cell membrane, and Src-mediated downstream signaling, such as the activation of mitogen-activated protein kinase and focal adhesion kinase. Our results uncover how the metabolism of dietary palmitate cooperates with elevated Src kinase in the acceleration of prostate tumor progression.
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Affiliation(s)
- Sungjin Kim
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia 30602
| | - Xiangkun Yang
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia 30602
| | - Amelia Yin
- Center for Molecular Medicine, Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602
| | - Junyi Zha
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia 30602
| | - Zanna Beharry
- Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, Florida 33965
| | - Aiping Bai
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Alicja Bielawska
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Michael G. Bartlett
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia 30602
| | - Hang Yin
- Center for Molecular Medicine, Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602
| | - Houjian Cai
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia 30602
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12
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Uddin MB, Roy KR, Hosain SB, Khiste SK, Hill RA, Jois SD, Zhao Y, Tackett AJ, Liu YY. An N 6-methyladenosine at the transited codon 273 of p53 pre-mRNA promotes the expression of R273H mutant protein and drug resistance of cancer cells. Biochem Pharmacol 2018; 160:134-145. [PMID: 30578766 DOI: 10.1016/j.bcp.2018.12.014] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 12/18/2018] [Indexed: 02/06/2023]
Abstract
Mutant p53 proteins that promote cancer cell invasive growth, metastasis and drug resistance emerge as therapeutic targets. Previously, we reported that suppression of ceramide glycosylation restored wild-type p53 protein and tumor suppressing function in cancer cells heterozygously carrying p53 R273H, a hot-spot missense mutation; however, the mechanisms underlying the control of mutant protein expression remain elusive. Herein, we report that an N6-methyladenosine (m6A) at the point-mutated codon 273 (G > A) of p53 pre-mRNA determines the mutant protein expression. Methylation of the transited adenosine was catalyzed by methyltransferase like 3 (METTL3), and this m6A-RNA promoted a preferential pre-mRNA splicing; consequently, the produced p53 R273H mutant protein resulted in acquired multidrug resistance in colon cancer cells. Furthermore, glycosphingolipids (particularly globotriaosylceramide) generated from serial ceramide glycosylation were seen to activate cSrc and β-catenin signaling so as to upregulate METTL3 expression, in turn promoting expression of p53 R273H mutant protein, with consequent drug resistance. Conversely, either silencing METTL3 expression by using small interfering RNA (siRNA) or inhibiting RNA methylation with neplanocin A suppressed m6A formation in p53 pre-mRNA, and substantially increased the level of phosphorylated p53 protein (Ser15) and its function in cells heterozygously carrying the R273H mutation, thereby re-sensitizing these cells to anticancer drugs. Concordantly, suppression of ceramide glycosylation repressed METTL3 expression and m6A formation in p53 pre-mRNA, thus sensitizing cells carrying R273H to anticancer drugs. This study uncovers a novel function of pre-mRNA m6A as a determinant of mutant protein expression in cancer cells heterozygously carrying the TP53 R273H mutation. Suppressing both RNA methylation and ceramide glycosylation might constitute an efficacious and specific approach for targeting TP53 missense mutations coding for a G > A transition, thereby improving cancer treatments.
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Affiliation(s)
- Mohammad B Uddin
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Kartik R Roy
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Salman B Hosain
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Sachin K Khiste
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Ronald A Hill
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Seetharama D Jois
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Yunfeng Zhao
- Department of Pharmacology, Toxicology & Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA
| | - Alan J Tackett
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
| | - Yong-Yu Liu
- School of Basic Pharmaceutical and Toxicological Sciences, University of Louisiana at Monroe, Monroe, LA 71201, USA.
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13
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Kilbey A, Terry A, Wotton S, Borland G, Zhang Q, Mackay N, McDonald A, Bell M, Wakelam MJO, Cameron ER, Neil JC. Runx1 Orchestrates Sphingolipid Metabolism and Glucocorticoid Resistance in Lymphomagenesis. J Cell Biochem 2017; 118:1432-1441. [PMID: 27869314 PMCID: PMC5408393 DOI: 10.1002/jcb.25802] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 11/18/2016] [Indexed: 12/12/2022]
Abstract
The three‐membered RUNX gene family includes RUNX1, a major mutational target in human leukemias, and displays hallmarks of both tumor suppressors and oncogenes. In mouse models, the Runx genes appear to act as conditional oncogenes, as ectopic expression is growth suppressive in normal cells but drives lymphoma development potently when combined with over‐expressed Myc or loss of p53. Clues to underlying mechanisms emerged previously from murine fibroblasts where ectopic expression of any of the Runx genes promotes survival through direct and indirect regulation of key enzymes in sphingolipid metabolism associated with a shift in the “sphingolipid rheostat” from ceramide to sphingosine‐1‐phosphate (S1P). Testing of this relationship in lymphoma cells was therefore a high priority. We find that ectopic expression of Runx1 in lymphoma cells consistently perturbs the sphingolipid rheostat, whereas an essential physiological role for Runx1 is revealed by reduced S1P levels in normal spleen after partial Cre‐mediated excision. Furthermore, we show that ectopic Runx1 expression confers increased resistance of lymphoma cells to glucocorticoid‐mediated apoptosis, and elucidate the mechanism of cross‐talk between glucocorticoid and sphingolipid metabolism through Sgpp1. Dexamethasone potently induces expression of Sgpp1 in T‐lymphoma cells and drives cell death which is reduced by partial knockdown of Sgpp1 with shRNA or direct transcriptional repression of Sgpp1 by ectopic Runx1. Together these data show that Runx1 plays a role in regulating the sphingolipid rheostat in normal development and that perturbation of this cell fate regulator contributes to Runx‐driven lymphomagenesis. J. Cell. Biochem. 118: 1432–1441, 2017. © 2016 The Authors. Journal of Cellular Biochemistry Published by Wiley Periodicals, Inc.
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Affiliation(s)
- A Kilbey
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - A Terry
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - S Wotton
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - G Borland
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - Q Zhang
- The Babraham Institute, Babraham Research Campus, Cambridge, CB22 3AT, Cambridgeshire, United Kingdom
| | - N Mackay
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - A McDonald
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - M Bell
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - M J O Wakelam
- The Babraham Institute, Babraham Research Campus, Cambridge, CB22 3AT, Cambridgeshire, United Kingdom
| | - E R Cameron
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
| | - J C Neil
- Molecular Oncology Laboratory, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G61 1QH, United Kingdom
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14
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Inhibition of ceramide de novo synthesis by myriocin produces the double effect of reducing pathological inflammation and exerting antifungal activity against A. fumigatus airways infection. Biochim Biophys Acta Gen Subj 2016; 1860:1089-97. [PMID: 26922830 DOI: 10.1016/j.bbagen.2016.02.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 02/02/2016] [Accepted: 02/22/2016] [Indexed: 12/22/2022]
Abstract
BACKGROUND Fungal infections develop in pulmonary chronic inflammatory diseases such as asthma, Chronic Obstructive Pulmonary Disease (COPD) and Cystic Fibrosis (CF). The available antifungal drugs may fail to eradicate fungal pathogens, that can invade the lungs and vessels and spread by systemic circulation taking advantage of defective lung immunity. An increased rate of sphingolipid de novo synthesis, leading to ceramide accumulation, was demonstrated in CF and COPD inflamed lungs. The inhibitor of sphingolipid synthesis myriocin reduces inflammation and ameliorates the response against bacterial airway infection in CF mice. Myriocin also inhibits sphingolipid synthesis in fungi and exerts a powerful fungistatic effect. METHODS We treated Aspergillus fumigatus infected airway epithelial cells with myriocin and we administered myriocin-loaded nanocarriers to A. fumigatus infected mice lung. RESULTS We demonstrate here that de novo synthesized ceramide mediates the inflammatory response induced by A. fumigatus infection in airway epithelia. CF epithelial cells are chronically inflamed and defective in killing internalized conidia. Myriocin treatment reduced ceramide increase and inflammatory mediator release whereas it upregulated HO1 and NOD2, allowing the recovery of a functional killing of conidia in these cells. Myriocin-loaded nanocarriers, intratracheally administered to mice, significantly reduced both the inflammatory response induced by A. fumigatus pulmonary challenge and fungal lung invasion. CONCLUSIONS We conclude that inhibition of sphingolipid synthesis can be envisaged as a dual anti-inflammatory and anti-fungal therapy in patients suffering from chronic lung inflammation with compromised immunity. GENERAL SIGNIFICANCE Myriocin represents a powerful agent for inflammatory diseases and fungal infection.
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15
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Ogiso H, Taniguchi M, Okazaki T. Analysis of lipid-composition changes in plasma membrane microdomains. J Lipid Res 2015; 56:1594-605. [PMID: 26116739 DOI: 10.1194/jlr.m059972] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Indexed: 11/20/2022] Open
Abstract
Sphingolipids accumulate in plasma membrane microdomain sites, such as caveolae or lipid rafts. Such microdomains are considered to be important nexuses for signal transduction, although changes in the microdomain lipid components brought about by signaling are poorly understood. Here, we applied a cationic colloidal silica bead method to analyze plasma membrane lipids from monolayer cells cultured in a 10 cm dish. The detergent-resistant fraction from the silica bead-coated membrane was analyzed by LC-MS/MS to evaluate the microdomain lipids. This method revealed that glycosphingolipids composed the microdomains as a substitute for sphingomyelin (SM) in mouse embryonic fibroblasts (tMEFs) from an SM synthase 1/2 double KO (DKO) mouse. The rate of formation of the detergent-resistant region was unchanged compared with that of WT-tMEFs. C2-ceramide (Cer) stimulation caused greater elevations in diacylglycerol and phosphatidic acid levels than in Cer levels within the microdomains of WT-tMEFs. We also found that lipid changes in the microdomains of SM-deficient DKO-tMEFs caused by serum stimulation occurred in the same manner as that of WT-tMEFs. This practical method for analyzing membrane lipids will facilitate future comprehensive analyses of membrane microdomain-associated responses.
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Affiliation(s)
- Hideo Ogiso
- Department of Hematology/Immunology Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
| | - Makoto Taniguchi
- Medical Research Institute, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
| | - Toshiro Okazaki
- Department of Hematology/Immunology Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan Medical Research Institute, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
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16
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Stith BJ. Phospholipase C and D regulation of Src, calcium release and membrane fusion during Xenopus laevis development. Dev Biol 2015; 401:188-205. [PMID: 25748412 DOI: 10.1016/j.ydbio.2015.02.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 02/15/2015] [Accepted: 02/24/2015] [Indexed: 11/28/2022]
Abstract
This review emphasizes how lipids regulate membrane fusion and the proteins involved in three developmental stages: oocyte maturation to the fertilizable egg, fertilization and during first cleavage. Decades of work show that phosphatidic acid (PA) releases intracellular calcium, and recent work shows that the lipid can activate Src tyrosine kinase or phospholipase C during Xenopus fertilization. Numerous reports are summarized to show three levels of increase in lipid second messengers inositol 1,4,5-trisphosphate and sn 1,2-diacylglycerol (DAG) during the three different developmental stages. In addition, possible roles for PA, ceramide, lysophosphatidylcholine, plasmalogens, phosphatidylinositol 4-phosphate, phosphatidylinositol 5-phosphate, phosphatidylinositol 4,5-bisphosphate, membrane microdomains (rafts) and phosphatidylinositol 3,4,5-trisphosphate in regulation of membrane fusion (acrosome reaction, sperm-egg fusion, cortical granule exocytosis), inositol 1,4,5-trisphosphate receptors, and calcium release are discussed. The role of six lipases involved in generating putative lipid second messengers during fertilization is also discussed: phospholipase D, autotaxin, lipin1, sphingomyelinase, phospholipase C, and phospholipase A2. More specifically, proteins involved in developmental events and their regulation through lipid binding to SH3, SH4, PH, PX, or C2 protein domains is emphasized. New models are presented for PA activation of Src (through SH3, SH4 and a unique domain), that this may be why the SH2 domain of PLCγ is not required for Xenopus fertilization, PA activation of phospholipase C, a role for PA during the calcium wave after fertilization, and that calcium/calmodulin may be responsible for the loss of Src from rafts after fertilization. Also discussed is that the large DAG increase during fertilization derives from phospholipase D production of PA and lipin dephosphorylation to DAG.
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Affiliation(s)
- Bradley J Stith
- University of Colorado Denver, Department of Integrative Biology, Campus Box 171, PO Box 173364, Denver, CO 80217-3364, United States.
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17
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Sasaki H, Toyomura K, Matsuzaki W, Okamoto A, Yamaguchi N, Nakamura H, Murayama T. Regulation of alkaline ceramidase activity by the c-Src-mediated pathway. Arch Biochem Biophys 2014; 550-551:12-9. [DOI: 10.1016/j.abb.2014.03.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/12/2014] [Accepted: 03/31/2014] [Indexed: 11/25/2022]
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18
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Saitou T, Kajiwara K, Oneyama C, Suzuki T, Okada M. Roles of raft-anchored adaptor Cbp/PAG1 in spatial regulation of c-Src kinase. PLoS One 2014; 9:e93470. [PMID: 24675741 PMCID: PMC3968143 DOI: 10.1371/journal.pone.0093470] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 03/06/2014] [Indexed: 11/21/2022] Open
Abstract
The tyrosine kinase c-Src is upregulated in numerous human cancers, implying a role for c-Src in cancer progression. Previously, we have shown that sequestration of activated c-Src into lipid rafts via a transmembrane adaptor, Cbp/PAG1, efficiently suppresses c-Src-induced cell transformation in Csk-deficient cells, suggesting that the transforming activity of c-Src is spatially regulated via Cbp in lipid rafts. To dissect the molecular mechanisms of the Cbp-mediated regulation of c-Src, a combined analysis was performed that included mathematical modeling and in vitro experiments in a c-Src- or Cbp-inducible system. c-Src activity was first determined as a function of c-Src or Cbp levels, using focal adhesion kinase (FAK) as a crucial c-Src substrate. Based on these experimental data, two mathematical models were constructed, the sequestration model and the ternary model. The computational analysis showed that both models supported our proposal that raft localization of Cbp is crucial for the suppression of c-Src function, but the ternary model, which includes a ternary complex consisting of Cbp, c-Src, and FAK, also predicted that c-Src function is dependent on the lipid-raft volume. Experimental analysis revealed that c-Src activity is elevated when lipid rafts are disrupted and the ternary complex forms in non-raft membranes, indicating that the ternary model accurately represents the system. Moreover, the ternary model predicted that, if Cbp enhances the interaction between c-Src and FAK, Cbp could promote c-Src function when lipid rafts are disrupted. These findings underscore the crucial role of lipid rafts in the Cbp-mediated negative regulation of c-Src-transforming activity, and explain the positive role of Cbp in c-Src regulation under particular conditions where lipid rafts are perturbed.
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Affiliation(s)
- Takashi Saitou
- Department of Molecular Medicine for Pathogenesis, Graduate School of Medicine, Ehime University, Shitsukawa, Toon, Ehime, Japan
- * E-mail: (TS); (KK)
| | - Kentaro Kajiwara
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
- * E-mail: (TS); (KK)
| | - Chitose Oneyama
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Takashi Suzuki
- Division of Mathematical Science, Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan
- JST, CREST, Chiyoda-ku, Tokyo, Japan
| | - Masato Okada
- Department of Oncogene Research, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
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