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Kasahara T, Chang TC, Yoshioka H, Urano S, Egawa Y, Inoue M, Tahara T, Morimoto K, Pradipta AR, Tanaka K. Anticancer approach by targeted activation of a global inhibitor of sialyltransferases with acrolein. Chem Sci 2024; 15:9566-9573. [PMID: 38939146 PMCID: PMC11206204 DOI: 10.1039/d4sc00969j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 04/28/2024] [Indexed: 06/29/2024] Open
Abstract
Cells are covered with a thick layer of sugar molecules known as glycans. Abnormal glycosylation is a hallmark of cancer, and hypersialylation increases tumor metastasis by promoting immune evasion and inducing tumor cell invasion and migration. Inhibiting sialylation is thus a potential anticancer treatment strategy. However, targeting sialic acids is difficult because of the lack of selective delivery tools. Here, we present a prodrug strategy for selectively releasing the global inhibitor of sialylation peracetylated 3Fax-Neu5Ac (PFN) in cancer cells using the reaction between phenyl azide and endogenous acrolein, which is overproduced in most cancer cells. The prodrug significantly suppressed tumor growth in mice as effectively as PFN without causing kidney dysfunction, which is associated with PFN. The use of sialylated glycans as immune checkpoints is gaining increasing attention, and the proposed method for precisely targeting aberrant sialylation provides a novel avenue for expanding current cancer treatments.
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Affiliation(s)
- Takatsugu Kasahara
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Tsung-Che Chang
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Hiromasa Yoshioka
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Sayaka Urano
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Yasuko Egawa
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Michiko Inoue
- Laboratory for Biofunction Dynamics Imaging, RIKEN Center for Biosystems Dynamics Research 6-7-3 Minatojima-minamimachi, Chuo-ku Kobe 650-0047 Japan
| | - Tsuyoshi Tahara
- Department of In vivo Imaging, Advanced Research Promoting Center, Tokushima University 3-18-15 Kuramto-cho Tokushima Tokushima 770-8503 Japan
| | - Koji Morimoto
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Ambara R Pradipta
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Katsunori Tanaka
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
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Zhang X, Liu H, Wang H, Zhao R, Lu Q, Liu Y, Han Y, LuluRen, Pan H, Han W. B3galt5 deficiency attenuates hepatocellular carcinoma by suppressing mTOR/p70s6k-mediated glycolysis. Cell Mol Life Sci 2022; 80:8. [PMID: 36495345 PMCID: PMC11072394 DOI: 10.1007/s00018-022-04601-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 10/12/2022] [Accepted: 10/14/2022] [Indexed: 12/13/2022]
Abstract
Hepatocellular carcinoma (HCC) is one of the most common malignancies with high morbidity and mortality. Beta-1,3-galactosyltransferase 5 (b3galt5) plays crucial roles in protein glycosylation, but its function in HCC remains unclear. Here, we investigated the role and underlying mechanism of b3galt5 in HCC. We found that b3galt5 is highly expressed and associated with a poor prognosis in HCC patients. In vitro studies showed that b3galt5 promoted the proliferation and survival of HCC cells. We also demonstrated that b3galt5 deficiency suppressed hepatocarcinogenesis in DEN/TCPOBOP-induced HCC. Further investigation confirmed that b3galt5 promoted aerobic glycolysis in HCC. Mechanistically, b3galt5 promoted glycolysis by activating the mTOR/p70s6k pathway through O-linked glycosylation modification on mTOR. Moreover, p70s6k inhibition reduced the expression of key glycolytic enzymes and the glycolysis rate in b3galt5-overexpressing cells. Our study uncovers a novel mechanism by which b3galt5 mediates glycolysis in HCC and highlights the b3galt5-mTOR/p70s6k axis as a potential target for HCC therapy.
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Affiliation(s)
- Xiaoling Zhang
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
- Department of Medical Oncology, Hangzhou First People's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hao Liu
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
- Laboratory of Cancer Biology, Institute of Clinical Science, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Haidong Wang
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
| | - Rongjie Zhao
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
| | - Qian Lu
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
| | - Yunlong Liu
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
- Laboratory of Cancer Biology, Institute of Clinical Science, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yicheng Han
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
| | - LuluRen
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China
| | - Hongming Pan
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China.
| | - Weidong Han
- Department of Medical Oncology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, 3# East Qingchun Road, Hangzhou, 310016, Zhejiang, China.
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Ton Tran HT, Li C, Chakraberty R, Cairo CW. NEU1 and NEU3 enzymes alter CD22 organization on B cells. BIOPHYSICAL REPORTS 2022; 2:100064. [PMID: 36425332 PMCID: PMC9680808 DOI: 10.1016/j.bpr.2022.100064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 07/19/2022] [Indexed: 06/16/2023]
Abstract
The B cell membrane expresses sialic-acid-binding immunoglobulin-like lectins, also called Siglecs, that are important for modulating immune response. Siglecs have interactions with sialoglycoproteins found on the same membrane (cis-ligands) that result in homotypic and heterotypic receptor clusters. The regulation and organization of these clusters, and their effect on cell activation, is not clearly understood. We investigated the role of human neuraminidase enzymes NEU1 and NEU3 on the clustering of CD22 on B cells using confocal microscopy. We observed that native NEU1 and NEU3 activity influence the cluster size of CD22. Using single-particle tracking, we observed that NEU3 activity increased the lateral mobility of CD22, which was in contrast to the effect of exogenous bacterial NEU enzymes. Moreover, we show that native NEU1 and NEU3 activity influenced cellular Ca2+ levels, supporting a role for these enzymes in regulating B cell activation. Our results establish a role for native NEU activity in modulating CD22 organization and function on B cells.
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Affiliation(s)
- Hanh-Thuc Ton Tran
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
| | - Caishun Li
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
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Tripathi A, Kashyap A, Tripathi G, Yadav J, Bibban R, Aggarwal N, Thakur K, Chhokar A, Jadli M, Sah AK, Verma Y, Zayed H, Husain A, Bharti AC, Kashyap MK. Tumor reversion: a dream or a reality. Biomark Res 2021; 9:31. [PMID: 33958005 PMCID: PMC8101112 DOI: 10.1186/s40364-021-00280-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 03/30/2021] [Indexed: 02/07/2023] Open
Abstract
Reversion of tumor to a normal differentiated cell once considered a dream is now at the brink of becoming a reality. Different layers of molecules/events such as microRNAs, transcription factors, alternative RNA splicing, post-transcriptional, post-translational modifications, availability of proteomics, genomics editing tools, and chemical biology approaches gave hope to manipulation of cancer cells reversion to a normal cell phenotype as evidences are subtle but definitive. Regardless of the advancement, there is a long way to go, as customized techniques are required to be fine-tuned with precision to attain more insights into tumor reversion. Tumor regression models using available genome-editing methods, followed by in vitro and in vivo proteomics profiling techniques show early evidence. This review summarizes tumor reversion developments, present issues, and unaddressed challenges that remained in the uncharted territory to modulate cellular machinery for tumor reversion towards therapeutic purposes successfully. Ongoing research reaffirms the potential promises of understanding the mechanism of tumor reversion and required refinement that is warranted in vitro and in vivo models of tumor reversion, and the potential translation of these into cancer therapy. Furthermore, therapeutic compounds were reported to induce phenotypic changes in cancer cells into normal cells, which will contribute in understanding the mechanism of tumor reversion. Altogether, the efforts collectively suggest that tumor reversion will likely reveal a new wave of therapeutic discoveries that will significantly impact clinical practice in cancer therapy.
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Affiliation(s)
- Avantika Tripathi
- Amity Stem Cell Institute, Amity Medical School, Amity University Haryana, Panchgaon, Haryana, Manesar (Gurugram), -122413, India
| | - Anjali Kashyap
- Department of Biotechnology, Thapar Institute of Engineering & Technology, Patiala, Punjab, India
| | - Greesham Tripathi
- Amity Stem Cell Institute, Amity Medical School, Amity University Haryana, Panchgaon, Haryana, Manesar (Gurugram), -122413, India
| | - Joni Yadav
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India
| | - Rakhi Bibban
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India
| | - Nikita Aggarwal
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India
| | - Kulbhushan Thakur
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India
| | - Arun Chhokar
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India
| | - Mohit Jadli
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India
| | - Ashok Kumar Sah
- Department of Medical Laboratory Technology, Amity Medical School, Amity University Haryana, Panchgaon, Haryana, Manesar (Gurugram), India
- Department of Pathology and Laboratory Medicine, Medanta-The Medicity, Haryana, Gurugram, India
| | - Yeshvandra Verma
- Department of Toxicology, C C S University, Meerut, UP, 250004, India
| | - Hatem Zayed
- Department of Biomedical Sciences, College of Health Sciences, QU Health, Qatar University, Doha, Qatar
| | - Amjad Husain
- Centre for Science & Society, Indian Institute of Science Education and Research (IISER), Bhopal, India
- Innovation and Incubation Centre for Entrepreneurship (IICE), Indian Institute of Science Education and Research (IISER), Bhopal, India
| | - Alok Chandra Bharti
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India.
| | - Manoj Kumar Kashyap
- Amity Stem Cell Institute, Amity Medical School, Amity University Haryana, Panchgaon, Haryana, Manesar (Gurugram), -122413, India.
- Department of Zoology, Molecular Oncology Laboratory, University of Delhi (North Campus), New Delhi, 110007, India.
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Abstract
Human lifespan has increased significantly in the last 200 years, emphasizing our need to age healthily. Insights into molecular mechanisms of aging might allow us to slow down its rate or even revert it. Similar to aging, glycosylation is regulated by an intricate interplay of genetic and environmental factors. The dynamics of glycopattern variation during aging has been mostly explored for plasma/serum and immunoglobulin G (IgG) N-glycome, as we describe thoroughly in this chapter. In addition, we discuss the potential functional role of agalactosylated IgG glycans in aging, through modulation of inflammation level, as proposed by the concept of inflammaging. We also comment on the potential to use the plasma/serum and IgG N-glycome as a biomarker of healthy aging and on the interventions that modulate the IgG glycopattern. Finally, we discuss the current knowledge about animal models for human plasma/serum and IgG glycosylation and mention other, less explored, instances of glycopattern changes during organismal aging and cellular senescence.
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Kinouchi S, Sato M, Furukawa H, Sato T. Suppression of Malignant Potentials of A549 Human Lung Cancer Cell Line by Downregulation of the β4-Galactosyltransferase 1 Gene Expression. Biol Pharm Bull 2020; 43:747-751. [PMID: 32023576 DOI: 10.1248/bpb.b19-01033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Our previous study demonstrated that downregulation of transcription factor Specificity protein (Sp) 1 suppresses the malignant potentials of A549 human lung cancer cell line with the reduced β4-galactosylation of highly branched N-glycans on cell surface glycoproteins. The reduced β4-galactosylation was brought about by the decreased expression of the β4-galactosyltransferase 1 (β4GalT1) gene. Herein, we examined whether the reduced β4-galactosylation by decreasing the β4GalT1 gene expression suppresses the malignant potentials of A549 cells. In the β4GalT1-downregulated cells, the β4-galactosylation of highly branched N-glycans was reduced in several glycoproteins such as lysosome-associated membrane protein-1 and E-cadherin. The anchorage-independent growth and migratory ability of the β4GalT1-downregulated cells decreased when compared with the control cells. Furthermore, the phosphorylation of p44/42 mitogen-activated protein kinase (MAPK) decreased in the β4GalT1-downregulated cells. These results indicate that downregulation of the β4GalT1 gene decreases the β4-galactosylation of highly branched N-glycans and the phosphorylation of p44/42 MAPK, and suppresses the malignant potentials of A549 cells.
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Affiliation(s)
- Saeka Kinouchi
- Laboratory of Glycobiology, Department of Bioengineering, Nagaoka University of Technology
| | - Miku Sato
- Laboratory of Glycobiology, Department of Bioengineering, Nagaoka University of Technology
| | - Haruna Furukawa
- Laboratory of Glycobiology, Department of Bioengineering, Nagaoka University of Technology
| | - Takeshi Sato
- Laboratory of Glycobiology, Department of Bioengineering, Nagaoka University of Technology
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Bacterial sialoglycosidases in Virulence and Pathogenesis. Pathogens 2019; 8:pathogens8010039. [PMID: 30909660 PMCID: PMC6471121 DOI: 10.3390/pathogens8010039] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/18/2019] [Accepted: 03/19/2019] [Indexed: 12/12/2022] Open
Abstract
Human oral microbiome and dysbiotic infections have been recently evidently identified. One of the major reasons for such dysbiosis is impairment of the immune system. Periodontitis is a chronic inflammatory disease affecting the tissues that surround and support the teeth. In the United States., approximately 65 million people are affected by this condition. Its occurrence is also associated with many important systemic diseases such as cardiovascular disease, rheumatoid arthritis, and Alzheimer’s disease. Among the most important etiologies of periodontitis is Porphyromonas gingivalis, a keystone bacterial pathogen. Keystone pathogens can orchestrate inflammatory disease by remodeling a normally benign microbiota causing imbalance between normal and pathogenic microbiota (dysbiosis). The important characteristics of P. gingivalis causing dysbiosis are its virulence factors which cause effective subversion of host defenses to its advantage allowing other pathogens to grow. Some of the mechanisms involved in these processes are still not well-understood. However, various microbial strategies target host sialoglycoproteins for immune dysregulation. In addition, the enzymes that break down sialoglycoproteins and sialoglycans are the “sialoglycoproteases”, resulting in exposed terminal sialic acid. This process could lead to pathogen-toll like receptor (TLR) interactions mediated through sialic acid receptor ligand mechanisms. Assessing the function of P. gingivalis sialoglycoproteases, could pave the way to designing carbohydrate analogues and sialic acid mimetics to serve as drug targets.
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8
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Haxho F, Neufeld RJ, Szewczuk MR. Neuraminidase-1: a novel therapeutic target in multistage tumorigenesis. Oncotarget 2018; 7:40860-40881. [PMID: 27029067 PMCID: PMC5130050 DOI: 10.18632/oncotarget.8396] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 03/18/2016] [Indexed: 12/15/2022] Open
Abstract
Several of the growth factors and their receptor tyrosine kinases (RTK) such as epidermal growth factor (EGF), platelet-derived growth factor (PDGF), fibroblast growth factor (FGF), vascular endothelial growth factor (VEGF), nerve growth factor (NGF) and insulin are promising candidate targets for cancer therapy. Indeed, tyrosine kinase inhibitors (TKI) have been developed to target these growth factors and their receptors, and have demonstrated dramatic initial responses in cancer therapy. Yet, most patients ultimately develop TKI drug resistance and relapse. It is essential in the clinical setting that the targeted therapies are to circumvent multistage tumorigenesis, including genetic mutations at the different growth factor receptors, tumor neovascularization, chemoresistance of tumors, immune-mediated tumorigenesis and the development of tissue invasion and metastasis. Here, we identify a novel receptor signaling platform linked to EGF, NGF, insulin and TOLL-like receptor (TLR) activations, all of which are known to play major roles in tumorigenesis. The importance of these findings signify an innovative and promising entirely new targeted therapy for cancer. The role of mammalian neuraminidase-1 (Neu1) in complex with matrix metalloproteinase-9 and G protein-coupled receptor tethered to RTKs and TLRs is identified as a major target in multistage tumorigenesis. Evidence exposing the link connecting growth factor-binding and immune-mediated tumorigenesis to this novel receptor-signaling paradigm will be reviewed in its current relationship to cancer.
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Affiliation(s)
- Fiona Haxho
- Departments of Biomedical and Molecular Sciences, Kingston, Ontario, Canada
| | - Ronald J Neufeld
- Department of Chemical Engineering, Queen's University, Kingston, Ontario, Canada
| | - Myron R Szewczuk
- Departments of Biomedical and Molecular Sciences, Kingston, Ontario, Canada
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Biological and Pathological Roles of Ganglioside Sialidases. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2018; 156:121-150. [DOI: 10.1016/bs.pmbts.2017.12.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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10
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Groux-Degroote S, Rodríguez-Walker M, Dewald JH, Daniotti JL, Delannoy P. Gangliosides in Cancer Cell Signaling. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2018; 156:197-227. [DOI: 10.1016/bs.pmbts.2017.10.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Bilir B, Sharma NV, Lee J, Hammarstrom B, Svindland A, Kucuk O, Moreno CS. Effects of genistein supplementation on genome‑wide DNA methylation and gene expression in patients with localized prostate cancer. Int J Oncol 2017; 51:223-234. [PMID: 28560383 PMCID: PMC5467777 DOI: 10.3892/ijo.2017.4017] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 03/27/2017] [Indexed: 12/28/2022] Open
Abstract
Epidemiological studies have shown that dietary compounds have significant effects on prostate carcinogenesis. Among dietary agents, genistein, the major isoflavone in soybean, is of particular interest because high consumption of soy products has been associated with a low incidence of prostate cancer, suggesting a preventive role of genistein in prostate cancer. In spite of numerous studies to understand the effects of genistein on prostate cancer, the mechanisms of action have not been fully elucidated. We investigated the differences in methylation and gene expression levels of prostate specimens from a clinical trial of genistein supplementation prior to prostatectomy using Illumina HumanMethylation450 and Illumina HumanHT-12 v4 Expression BeadChip Microarrays. The present study was a randomized, placebo-controlled, double-blind clinical trial on Norwegian patients who received 30 mg genistein or placebo capsules daily for 3–6 weeks before prostatectomy. Gene expression changes were validated by quantitative PCR (qPCR). Whole genome methylation and expression profiling identified differentially methylated sites and expressed genes between placebo and genistein groups. Differentially regulated genes were involved in developmental processes, stem cell markers, proliferation and transcriptional regulation. Enrichment analysis suggested overall reduction in MYC activity and increased PTEN activity in genistein-treated patients. These findings highlight the effects of genistein on global changes in gene expression in prostate cancer and its effects on molecular pathways involved in prostate tumorigenesis.
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Affiliation(s)
- Birdal Bilir
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA, USA
| | - Nitya V Sharma
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA, USA
| | - Jeongseok Lee
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA, USA
| | - Bato Hammarstrom
- Department of Urology, Institute of Cancer Research, Oslo University Hospital, Oslo, Norway
| | - Aud Svindland
- Department of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Omer Kucuk
- Department of Hematology and Medical Oncology, Emory University, Atlanta, GA, USA
| | - Carlos S Moreno
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA, USA
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Huang BP, Lin CS, Wang CJ, Kao SH. Upregulation of heat shock protein 70 and the differential protein expression induced by tumor necrosis factor-alpha enhances migration and inhibits apoptosis of hepatocellular carcinoma cell HepG2. Int J Med Sci 2017; 14:284-293. [PMID: 28367089 PMCID: PMC5370291 DOI: 10.7150/ijms.17861] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 01/30/2017] [Indexed: 12/17/2022] Open
Abstract
Tumor necrosis factor alpha (TNFα) plays diverse roles in liver damage and hepatocarcinogenesis with its multipotent bioactivity. However, the influence of TNFα on protein expression of hepatocellular carcinoma (HCC) is incompletely understood. Therefore, we aimed to investigate the differential protein expression of HCC in response to TNFα stimulus. We observed that HepG2 cell revealed a higher resistance to TNFα-induced apoptosis as compared to the non-tumorigenic hepatocyte THLE-2. By using a label-free quantitative proteomic analysis, we found that 520 proteins were differentially expressed in the HepG2 cells exposed to TNFα, including 211 up-regulated and 309 down-regulated proteins. We further confirmed several proteins with significant expression change (TNFα/control ratio>2.0 or <0.5) by immunoblotting using specific antibodies. We also analyzed the differential expressed proteins using Gene ontology and KEGG annotations, and the results implicated that TNFα might regulate ribosome, spliceosome, antigen processing and presentation, and energy metabolism in HepG2 cells. Moreover, we demonstrated that upregulation of heat shock protein 70 (HSP70) was involved in both the promoted migration and the inhibited apoptosis of HepG2 cells in response to TNFα. Collectively, these findings indicate that TNFα alters protein expression such as HSP70, which triggering specific molecular processes and signaling cascades that promote migration and inhibit apoptosis of HepG2 cells.
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Affiliation(s)
- Bee-Piao Huang
- Department of pathology, Tungs' Taichung MetroHarbor Hospital, Taichung, Taiwan
| | - Chun-Shiang Lin
- Institute of Biochemistry, Microbiology, and Immunology, Chung Shan Medical University, Taichung City, Taiwan
| | - Chau-Jong Wang
- Institute of Biochemistry, Microbiology, and Immunology, Chung Shan Medical University, Taichung City, Taiwan.; Clinical Laboratory, Chung Shan Medical University Hospital, Taichung City, Taiwan
| | - Shao-Hsuan Kao
- Institute of Biochemistry, Microbiology, and Immunology, Chung Shan Medical University, Taichung City, Taiwan.; Clinical Laboratory, Chung Shan Medical University Hospital, Taichung City, Taiwan
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MicroRNA-125b promotes invasion and metastasis of gastric cancer by targeting STARD13 and NEU1. Tumour Biol 2016; 37:12141-12151. [PMID: 27220320 DOI: 10.1007/s13277-016-5094-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 05/15/2016] [Indexed: 12/19/2022] Open
Abstract
MicroRNAs have been documented playing key roles in cancer development and progression. Here, we investigate the role of miR-125b in gastric cancer metastasis. We found that the expression of miR-125b was up-regulated in gastric cancer tissue specimens compared with their corresponding nontumorous tissues, and the up-regulated miR-125b level was significantly associated with TNM stage and lymph node-metastasis. Overexpression of miR-125b promoted gastric cancer cell migration and invasion in vitro and metastasis in vivo. STARD13 and NEU1 were identified as direct target genes of miR-125b by luciferase assays, and they were involved in the cell migration and invasion regulated by miR-125b in gastric cancer. Taken together, miR-125b functions as an oncogene in gastric cancer and represents a new potential therapeutic target for gastric cancer.
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Zhao T, Tang X, Umeshappa CS, Ma H, Gao H, Deng Y, Freywald A, Xiang J. Simulated Microgravity Promotes Cell Apoptosis Through Suppressing Uev1A/TICAM/TRAF/NF-κB-Regulated Anti-Apoptosis and p53/PCNA- and ATM/ATR-Chk1/2-Controlled DNA-Damage Response Pathways. J Cell Biochem 2016; 117:2138-48. [PMID: 26887372 DOI: 10.1002/jcb.25520] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 02/12/2016] [Indexed: 11/11/2022]
Abstract
Microgravity has been known to induce cell death. However, its underlying mechanism is less studied. In this study, BL6-10 melanoma cells were cultured in flasks under simulated microgravity (SMG). We examined cell apoptosis, and assessed expression of genes associated with apoptosis and genes regulating apoptosis in cells under SMG. We demonstrate that SMG induces cell morphological changes and microtubule alterations by confocal microscopy, and enhances apoptosis by flow cytometry, which was associated with up- and down-regulation of pro-apoptotic and anti-apoptotic genes, respectively. Moreover, up- and down-regulation of pro-apoptotic (Caspases 3, 7, 8) and anti-apoptotic (Bcl2 and Bnip3) molecules was confirmed by Western blotting analysis. Western blot analysis also indicates that SMG causes inhibition of an apoptosis suppressor, pNF-κB-p65, which is complemented by the predominant localization of NF-κB-p65 in the cytoplasm. SMG also reduces expression of molecules regulating the NF-κB pathway including Uev1A, TICAM, TRAF2, and TRAF6. Interestingly, 10 DNA repair genes are down-regulated in cells exposed to SMG, among which down-regulation of Parp, Ercc8, Rad23, Rad51, and Ku70 was confirmed by Western blotting analysis. In addition, we demonstrate a significant inhibition of molecules involved in the DNA-damage response, such as p53, PCNA, ATM/ATR, and Chk1/2. Taken together, our work reveals that SMG promotes the apoptotic response through a combined modulation of the Uev1A/TICAM/TRAF/NF-κB-regulated apoptosis and the p53/PCNA- and ATM/ATR-Chk1/2-controlled DNA-damage response pathways. Thus, our investigation provides novel information, which may help us to determine the cause of negative alterations in human physiology occurring at spaceflight environment. J. Cell. Biochem. 117: 2138-2148, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Tuo Zhao
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Xin Tang
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | | | - Hong Ma
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Haijun Gao
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Yulin Deng
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Andrew Freywald
- Department of Pathology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Jim Xiang
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China.,Cancer Research Cluster, Saskatchewan Cancer Agency, Saskatoon, Saskatchewan, Canada
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15
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Chia J, Goh G, Bard F. Short O-GalNAc glycans: regulation and role in tumor development and clinical perspectives. Biochim Biophys Acta Gen Subj 2016; 1860:1623-39. [PMID: 26968459 DOI: 10.1016/j.bbagen.2016.03.008] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 03/03/2016] [Accepted: 03/03/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND While the underlying causes of cancer are genetic modifications, changes in cellular states mediate cancer development. Tumor cells display markedly changed glycosylation states, of which the O-GalNAc glycans called the Tn and TF antigens are particularly common. How these antigens get over-expressed is not clear. The expression levels of glycosylation enzymes fail to explain it. SCOPE OF REVIEW We describe the regulation of O-GalNAc glycosylation initiation and extension with emphasis on the initiating enzymes ppGalNAcTs (GALNTs), and introduce the GALA pathway--a change in GALNTs compartmentation within the secretory pathway that regulates Tn levels. We discuss the roles of O-GalNAc glycans and GALNTs in tumorigenic processes and finally consider diagnostic and therapeutic perspectives. MAJOR CONCLUSIONS Contrary to a common hypothesis, short O-glycans in tumors are not the result of an incomplete glycosylation process but rather reveal the activation of regulatory pathways. Surprisingly, high Tn levels reveal a major shift in the O-glycoproteome rather than a shortening of O-glycans. These changes are driven by membrane trafficking events. GENERAL SIGNIFICANCE Many attempts to use O-glycans for biomarker, antibody and therapeutic vaccine development have been made, but suffer limitations including poor sensitivity and/or specificity that may in part derive from lack of a mechanistic understanding. Deciphering how short O-GalNAc glycans are regulated would open new perspectives to exploit this biology for therapeutic usage. This article is part of a Special Issue entitled "Glycans in personalised medicine" Guest Editor: Professor Gordan Lauc.
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Affiliation(s)
- Joanne Chia
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, Proteos, 138673, Singapore
| | - Germaine Goh
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, Proteos, 138673, Singapore
| | - Frederic Bard
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, Proteos, 138673, Singapore; Department of Biochemistry, National University of Singapore, 21 Lower Kent Ridge, Road, 119077, Singapore.
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16
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Sethi MK, Fanayan S. Mass Spectrometry-Based N-Glycomics of Colorectal Cancer. Int J Mol Sci 2015; 16:29278-304. [PMID: 26690136 PMCID: PMC4691109 DOI: 10.3390/ijms161226165] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 11/23/2015] [Accepted: 12/01/2015] [Indexed: 12/19/2022] Open
Abstract
Colorectal cancer (CRC) is one of the most prevalent cancers worldwide. An increased molecular understanding of the CRC pathology is warranted to gain insights into the underlying molecular and cellular mechanisms of the disease. Altered protein glycosylation patterns are associated with most diseases including malignant transformation. Recent advances in mass spectrometry and bioinformatics have accelerated glycomics research and present a new paradigm for cancer biomarker discovery. Mass spectrometry (MS)-based glycoproteomics and glycomics, therefore, hold considerable promise to improve the discovery of novel biomarkers with utility in disease diagnosis and therapy. This review focuses on the emerging field of glycomics to present a comprehensive review of advances in technologies and their application in studies aimed at discovering novel glycan-based biomarkers. We will also discuss some of the challenges associated with using glycans as biomarkers.
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Affiliation(s)
- Manveen K Sethi
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia.
| | - Susan Fanayan
- Department of Biomedical Sciences, Macquarie University, North Ryde, NSW 2109, Australia.
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17
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Takahashi K, Hosono M, Sato I, Hata K, Wada T, Yamaguchi K, Nitta K, Shima H, Miyagi T. Sialidase NEU3 contributes neoplastic potential on colon cancer cells as a key modulator of gangliosides by regulating Wnt signaling. Int J Cancer 2015; 137:1560-73. [PMID: 25810027 DOI: 10.1002/ijc.29527] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 03/12/2015] [Indexed: 01/01/2023]
Abstract
The plasma membrane-associated sialidase NEU3 is a key enzyme for ganglioside degradation. We previously demonstrated remarkable up-regulation of NEU3 in various human cancers, with augmented malignant properties. Here, we provide evidence of a close link between NEU3 expression and Wnt/β-catenin signaling in colon cancer cells by analyzing tumorigenic potential and cancer stem-like characteristics. NEU3 silencing in HT-29 and HCT116 colon cancer cells resulted in significant decrease in clonogenicity on soft agar and in vivo tumor growth, along with down-regulation of stemness and Wnt-related genes. Analyses further revealed that NEU3 enhanced phosphorylation of the Wnt receptor LRP6 and consequently β-catenin activation by accelerating complex formation with LRP6 and recruitment of GSK3β and Axin, whereas its silencing exerted the opposite effects. NEU3 activity-null mutants failed to demonstrate the activation, indicating the requirement of ganglioside modulation by the sialidase for the effects. Under sphere-forming conditions, when stemness genes are up-regulated, endogenous NEU3 expression was found to be significantly increased, whereas NEU3 silencing suppressed sphere-formation and in vivo tumor incidence in NOD-SCID mice. Increased ability of clonogenicity on soft agar and sphere formation by Wnt stimulation was abrogated by NEU3 silencing. Furthermore, NEU3 was found to regulate phosphorylation of ERK and Akt via EGF receptor and Ras cascades, thought to be additionally required for tumor progression. The results indicate an essential contribution of NEU3 to tumorigenic potential through maintenance of stem-like characteristics of colon cancer cells by regulating Wnt signaling at the receptor level, in addition to tumor progression via Ras/MAPK signaling.
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Affiliation(s)
- Kohta Takahashi
- Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai.,Division of Cancer Molecular Biology, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Masahiro Hosono
- Division of Cell Recognition Study, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai
| | - Ikuro Sato
- Division of Pathology, Miyagi Cancer Center Research Institute, Natori
| | - Keiko Hata
- Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai
| | - Tadashi Wada
- Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai
| | - Kazunori Yamaguchi
- Division of Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, Natori
| | - Kazuo Nitta
- Division of Cancer Molecular Biology, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Hiroshi Shima
- Division of Cancer Molecular Biology, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Taeko Miyagi
- Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai
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18
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Yamamoto K, Takahashi K, Shiozaki K, Yamaguchi K, Moriya S, Hosono M, Shima H, Miyagi T. Potentiation of epidermal growth factor-mediated oncogenic transformation by sialidase NEU3 leading to Src activation. PLoS One 2015; 10:e0120578. [PMID: 25803810 PMCID: PMC4372364 DOI: 10.1371/journal.pone.0120578] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 01/24/2015] [Indexed: 11/18/2022] Open
Abstract
We previously demonstrated that sialidase NEU3, a key glycosidase for ganglioside degradation, is up-regulated in various human cancers, leading to increased cell invasion, motility and survival of cancer cells possibly through activation of EGF signaling. Its up-regulation is also important for promotion of the stage of colorectal carcinogenesis in vivo in human NEU3 transgenic mice treated with azoxymethane for the induction of aberrant crypt foci in the colon mucosa, accompanied by enhanced phosphorylation of EGF receptor (EGFR). To address whether the activation of EGF signaling by the sialidase is associated with oncogenic transformation, we here analyzed the effects of overexpression of NEU3 and EGFR in NIH-3T3 cells. When NEU3 was stably transfected with or without EGFR, it was associated with significant increases in clonogenic growth, clonogenicity on soft agar and in vivo tumor growth in nude mice either with or without the receptor overexpression in the presence of EGF, compared with the levels in their vector controls. Despite the fact that the endogenous level of EGFR is known to be extremely low in these cells, NEU3 significantly enhanced the phosphorylation of Akt and ERK, as well as that of the receptor. The NEU3-mediated activation was largely abrogated by the EGFR inhibitor AG1478 or PD153035, but significant clonogenic growth still remained. NEU3 was then found to activate Src kinase, and the clonogenicity was completely suppressed by an Src inhibitor, PP2. The activity-null mutants failed to activate Src and EGFR, indicating that ganglioside modulation by NEU3 may be necessary for the activation. NEU3 and Src were co-immunoprecipitated with EGFR in NEU3- and EGFR- transfected cells. These findings identify NEU3 as an essential participant in tumorigenesis through the EGFR/Src signaling pathway and a potential target for inhibiting EGFR-mediated tumor progression.
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Affiliation(s)
- Koji Yamamoto
- Departments of Cancar Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan
- Division of Cancer Molecular Biology, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Kohta Takahashi
- Departments of Cancar Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan
| | - Kazuhiro Shiozaki
- Faculty of Fisheries and The United Graduate School of Agricultural Science, Kagoshima University, Kagoshima, Japan
| | - Kazunori Yamaguchi
- Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, Natori, Japan
| | - Setsuko Moriya
- Departments of Cancar Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan
| | - Masahiro Hosono
- Departments of Cell Recognition Study, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan
| | - Hiroshi Shima
- Division of Cancer Molecular Biology, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Taeko Miyagi
- Departments of Cancar Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan
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19
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Büll C, Boltje TJ, van Dinther EAW, Peters T, de Graaf AMA, Leusen JHW, Kreutz M, Figdor CG, den Brok MH, Adema GJ. Targeted delivery of a sialic acid-blocking glycomimetic to cancer cells inhibits metastatic spread. ACS NANO 2015; 9:733-45. [PMID: 25575241 DOI: 10.1021/nn5061964] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Sialic acid sugars are overexpressed by cancer cells and contribute to the metastatic cascade at multiple levels. Therapeutic interference of sialic acids, however, has been difficult to pursue because of the absence of dedicated tools. Here we show that a rationally designed sialic acid-blocking glycomimetic (P-3F(ax)-Neu5Ac) successfully prevents cancer metastasis. Formulation of P-3F(ax)--Neu5Ac into poly(lactic-co-glycolic acid nanoparticles coated with antityrosinase-related protein-1 antibodies allowed targeted delivery of P-3F(ax)--Neu5Ac into melanoma cells, slow release, and long-term sialic acid blockade. Most importantly, intravenous injections of melanoma-targeting P-3F(ax)--Neu5Ac nanoparticles prevented metastasis formation in a murine lung metastasis model. These findings stress the importance of sialoglycans in cancer metastasis and advocate that sialic acid blockade using rationally designed glycomimetics targeted to cancer cells can effectively prevent cancer metastases. This targeting strategy to interfere with sialic acid-dependent processes is broadly applicable not only for different types of cancer but also in infection and inflammation.
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Affiliation(s)
- Christian Büll
- Department of Tumor Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center , Geert Grooteplein 28, 6525 GA Nijmegen, The Netherlands
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20
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Shiozaki K, Ryuzono S, Matsushita N, Ikeda A, Takeshita K, Chigwechokha PK, Komatsu M, Miyagi T. Molecular cloning and biochemical characterization of medaka (Oryzias latipes) lysosomal neu4 sialidase. FISH PHYSIOLOGY AND BIOCHEMISTRY 2014; 40:1461-1472. [PMID: 24744226 DOI: 10.1007/s10695-014-9940-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 04/09/2014] [Indexed: 06/03/2023]
Abstract
Glycoconjugates are known to be involved in many physiological events in vertebrates. Sialidase is one of the glycosidases, which removes sialic acid from glycoconjugates. In mammals, the properties and physiological functions of sialidases have been investigated, while there is little understanding of fish sialidase. Here, to investigate the significance of fish neu4 sialidase, neu4 gene was cloned from medaka brain mRNA and identified. Sialidase-specific motifs (GPG, YRVP and Asp-Box) were well conserved in the medaka neu4 polypeptide. Optimal pH of medaka neu4 sialidase was 4.6, but its activity was sustained even at neutral and weak alkaline pH. The neu4 considerably cleaved sialic acid from 4-methylumbelliferyl-N-acetyl-α-D-neuraminic acid and sialyllactose, but not from ganglioside and fetuin, which are good substrates for human NEU4. neu4 activity was mostly detected in mitochondria/lysosome fraction after biochemical fractionation, and indirect immunofluorescence assays revealed neu4 localization in lysosome in neu4 overexpressed cells. Next, developmental change in medaka neu4 and other sialidase mRNA levels were estimated by real-time PCR. Each sialidases showed different expression patterns in embryonic development: neu4 was up-regulated at late developmental stage in embryo, and neu3a mRNA level was quite high in 0.5 dpf. On the other hand, neu3b expression was drastically increased after hatching, suggesting that each sialidase may play a different role in embryonic development.
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Affiliation(s)
- Kazuhiro Shiozaki
- Faculty of Fisheries, Kagoshima University, 4-50-20 Shimo-arata, Kagoshima, 890-0056, Japan,
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21
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Pshezhetsky AV, Ashmarina LI. Desialylation of surface receptors as a new dimension in cell signaling. BIOCHEMISTRY (MOSCOW) 2014; 78:736-45. [PMID: 24010837 DOI: 10.1134/s0006297913070067] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Terminal sialic acid residues are found in abundance in glycan chains of glycoproteins and glycolipids on the surface of all live cells forming an outer layer of the cell originally known as glycocalyx. Their presence affects the molecular properties and structure of glycoconjugates, modifying their function and interactions with other molecules. Consequently, the sialylation state of glycoproteins and glycolipids has been recognized as a critical factor modulating molecular recognitions inside the cell, between the cells, between the cells and the extracellular matrix, and between the cells and certain exogenous pathogens. Until recently sialyltransferases that catalyze transfer of sialic acid residues to the glycan chains in the process of their biosynthesis were thought to be mainly responsible for the creation and maintenance of a temporal and spatial diversity of sialylated moieties. However, the growing evidence suggests that in mammalian cells, at least equally important roles belong to sialidases/neuraminidases, which are located on the cell surface and in intracellular compartments, and may either initiate the catabolism of sialoglycoconjugates or just cleave their sialic acid residues, and thereby contribute to temporal changes in their structure and functions. The current review summarizes emerging data demonstrating that mammalian neuraminidase 1, well known for its lysosomal catabolic function, is also targeted to the cell surface and assumes the previously unrecognized role as a structural and functional modulator of cellular receptors.
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Affiliation(s)
- A V Pshezhetsky
- Department of Medical Genetics, CHU Sainte-Justine Research Center, Montreal, Qc, H3T1C5, Canada.
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22
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Miyagi T, Takahashi K, Hata K, Shiozaki K, Yamaguchi K. Sialidase significance for cancer progression. Glycoconj J 2012; 29:567-77. [PMID: 22644327 DOI: 10.1007/s10719-012-9394-1] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 05/05/2012] [Accepted: 05/08/2012] [Indexed: 11/26/2022]
Abstract
Aberrant glycosylation is a characteristic feature of cancer cells. In particular, altered sialylation is closely associated with malignant properties, including invasiveness and metastatic potential. To elucidate the molecular mechanisms underlying the aberrancy, our studies have focused on mammalian sialidase, which catalyzes the removal of sialic acid residues from glycoproteins and glycolipids. The four types of mammalian sialidase identified to date show altered expression and behave in different manners during carcinogenesis. The present review briefly summarizes results on altered expression of sialidases and their possible roles in cancer progression. These enzymes are indeed factors defining cancer malignancy and thus potential targets for cancer diagnosis and therapy.
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Affiliation(s)
- Taeko Miyagi
- Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan.
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23
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Cross AS, Hyun SW, Miranda-Ribera A, Feng C, Liu A, Nguyen C, Zhang L, Luzina IG, Atamas SP, Twaddell WS, Guang W, Lillehoj EP, Puché AC, Huang W, Wang LX, Passaniti A, Goldblum SE. NEU1 and NEU3 sialidase activity expressed in human lung microvascular endothelia: NEU1 restrains endothelial cell migration, whereas NEU3 does not. J Biol Chem 2012; 287:15966-80. [PMID: 22403397 DOI: 10.1074/jbc.m112.346817] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The microvascular endothelial surface expresses multiple molecules whose sialylation state regulates multiple aspects of endothelial function. To better regulate these sialoproteins, we asked whether endothelial cells (ECs) might express one or more catalytically active sialidases. Human lung microvascular EC lysates contained heat-labile sialidase activity for a fluorogenic substrate, 2'-(4-methylumbelliferyl)-α-D-N-acetylneuraminic acid (4-MU-NANA), that was dose-dependently inhibited by the competitive sialidase inhibitor, 2,3-dehydro-2-deoxy-N-acetylneuraminic acid but not its negative control. The EC lysates also contained sialidase activity for a ganglioside mixture. Using real time RT-PCR to detect mRNAs for the four known mammalian sialidases, NEU1, -2, -3, and -4, NEU1 mRNA was expressed at levels 2700-fold higher that those found for NEU2, -3, or -4. Western analyses indicated NEU1 and -3 protein expression. Using confocal microscopy and flow cytometry, NEU1 was immunolocalized to both the plasma membrane and the perinuclear region. NEU3 was detected both in the cytosol and nucleus. Prior siRNA-mediated knockdown of NEU1 and NEU3 each decreased EC sialidase activity for 4-MU-NANA by >65 and >17%, respectively, and for the ganglioside mixture by 0 and 40%, respectively. NEU1 overexpression in ECs reduced their migration into a wound by >40%, whereas NEU3 overexpression did not. Immunohistochemical studies of normal human tissues immunolocalized NEU1 and NEU3 proteins to both pulmonary and extrapulmonary vascular endothelia. These combined data indicate that human lung microvascular ECs as well as other endothelia express catalytically active NEU1 and NEU3. NEU1 restrains EC migration, whereas NEU3 does not.
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Affiliation(s)
- Alan S Cross
- Center for Vaccine Development, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
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24
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Takahashi K, Mitoma J, Hosono M, Shiozaki K, Sato C, Yamaguchi K, Kitajima K, Higashi H, Nitta K, Shima H, Miyagi T. Sialidase NEU4 hydrolyzes polysialic acids of neural cell adhesion molecules and negatively regulates neurite formation by hippocampal neurons. J Biol Chem 2012; 287:14816-26. [PMID: 22393058 DOI: 10.1074/jbc.m111.324186] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Modulation of levels of polysialic acid (polySia), a sialic acid polymer, predominantly associated with the neural cell adhesion molecule (NCAM), influences neural functions, including synaptic plasticity, neurite growth, and cell migration. Biosynthesis of polySia depends on two polysialyltransferases ST8SiaII and ST8SiaIV in vertebrate. However, the enzyme involved in degradation of polySia in its physiological turnover remains uncertain. In the present study, we identified and characterized a murine sialidase NEU4 that catalytically degrades polySia. Murine NEU4, dominantly expressed in the brain, was found to efficiently hydrolyze oligoSia and polySia chains as substrates in sialidase in vitro assays, and also NCAM-Fc chimera as well as endogenous NCAM in tissue homogenates of postnatal mouse brain as assessed by immunoblotting with anti-polySia antibodies. Degradation of polySia by NEU4 was also evident in neuroblastoma Neuro2a cells that were co-transfected with Neu4 and ST8SiaIV genes. Furthermore, in mouse embryonic hippocampal primary neurons, the endogenously expressed NEU4 was found to decrease during the neuronal differentiation. Interestingly, GFP- or FLAG-tagged NEU4 was partially co-localized with polySia in neurites and significantly suppressed their outgrowth, whereas silencing of NEU4 showed the acceleration together with an increase in polySia expression. These results suggest that NEU4 is involved in regulation of neuronal function by polySia degradation in mammals.
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Affiliation(s)
- Kohta Takahashi
- Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, 981-8558, Japan
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25
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Miyagi T, Yamaguchi K. Mammalian sialidases: physiological and pathological roles in cellular functions. Glycobiology 2012; 22:880-96. [PMID: 22377912 DOI: 10.1093/glycob/cws057] [Citation(s) in RCA: 269] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Sialic acids are terminal acidic monosaccharides, which influence the chemical and biological features of glycoconjugates. Their removal catalyzed by a sialidase modulates various biological processes through change in conformation and creation or loss of binding sites of functional molecules. Sialidases exist widely in vertebrates and also in a variety of microorganisms. Recent research on mammalian sialidases has provided evidence for great importance of these enzymes in various cellular functions, including lysosomal catabolism, whereas microbial sialidases appear to play roles limited to nutrition and pathogenesis. Four types of mammalian sialidases have been identified and characterized to date, designated as NEU1, NEU2, NEU3 and NEU4. They are encoded by different genes and differ in major subcellular localization and enzymatic properties including substrate specificity, and each has been found to play a unique role depending on its particular properties. This review is an attempt to concisely summarize current knowledge concerning mammalian sialidases, with a special focus on their properties and physiological and pathological roles in cellular functions.
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Affiliation(s)
- Taeko Miyagi
- Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, Sendai, Japan.
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26
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Lillehoj EP, Hyun SW, Feng C, Zhang L, Liu A, Guang W, Nguyen C, Luzina IG, Atamas SP, Passaniti A, Twaddell WS, Puché AC, Wang LX, Cross AS, Goldblum SE. NEU1 sialidase expressed in human airway epithelia regulates epidermal growth factor receptor (EGFR) and MUC1 protein signaling. J Biol Chem 2012; 287:8214-31. [PMID: 22247545 DOI: 10.1074/jbc.m111.292888] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Epithelial cells (ECs) lining the airways provide a protective barrier between the external environment and the internal host milieu. These same airway epithelia express receptors that respond to danger signals and initiate repair programs. Because the sialylation state of a receptor can influence its function and is dictated in part by sialidase activity, we asked whether airway epithelia express catalytically active sialidase(s). Human primary small airway and A549 ECs expressed NEU1 sialidase at the mRNA and protein levels, and NEU1 accounted for >70% of EC sialidase activity. Blotting with Maackia amurensis and peanut agglutinin lectins established epidermal growth factor receptor (EGFR) and MUC1 as in vivo substrates for NEU1. NEU1 associated with EGFR and MUC1, and NEU1-EGFR association was regulated by EGF stimulation. NEU1 overexpression diminished EGF-stimulated EGFR Tyr-1068 autophosphorylation by up to 44% but enhanced MUC1-dependent Pseudomonas aeruginosa adhesion by 1.6-1.7-fold and flagellin-stimulated ERK1/2 activation by 1.7-1.9-fold. In contrast, NEU1 depletion increased EGFR activation (1.5-fold) and diminished MUC1-mediated bacterial adhesion (38-56%) and signaling (73%). These data indicate for the first time that human airway epithelia express catalytically active NEU1 sialidase that regulates EGFR- and MUC1-dependent signaling and bacterial adhesion. NEU1 catalytic activity may offer an additional level of regulation over the airway epithelial response to ligands, pathogens, and injurious stimuli.
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Affiliation(s)
- Erik P Lillehoj
- Departments of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
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Abstract
The removal of sialic acids, catalyzed by sialidase, is the initial step in degradation of oligosaccharides, glycoproteins, and glycolipids. The catalytic reaction may greatly influence biological processes through changing the conformation of glycoproteins and create or mask binding sites of functional molecules. Recent progress in sialidase research has clarified that mammalian sialidases indeed contribute to the regulation of various cellular functions as well as lysosomal catabolism, unlike the sialidases of microbial origin that probably play roles limited to nutrition and pathogenesis. However, the mammalian enzymes contain consensus sequences in the six-blade β-propeller structural organization typical of microbial sialidases, despite the low degree of similarity to the amino acid sequences of the microbial enzymes. The present review briefly summarizes structural and functional features of mammalian sialidases.
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Affiliation(s)
- Eugenio Monti
- Faculty of Medicine, Department of Biomedical Sciences and Biotechnology, University of Brescia, Brescia, Viale Europa 11, 25123, Brescia, Italy
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Where catabolism meets signalling: neuraminidase 1 as a modulator of cell receptors. Glycoconj J 2011; 28:441-52. [PMID: 21928149 DOI: 10.1007/s10719-011-9350-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Revised: 02/24/2011] [Accepted: 03/08/2011] [Indexed: 12/19/2022]
Abstract
Terminal sialic acid residues are found in abundance in glycan chains of glycoproteins and glycolipids on the surface of all live cells forming an outer layer of the cell originally known as glycocalyx. Their presence affects the molecular properties and structure of glycoconjugates, modifying their function and interactions with other molecules. Consequently, the sialylation state of glycoproteins and glycolipids has been recognized as a critical factor modulating molecular recognitions inside the cell, between the cells, between the cells and the extracellular matrix, and between the cells and certain exogenous pathogens. Sialyltransferases that attach sialic acid residues to the glycan chains in the process of their initial synthesis were thought to be mainly responsible for the creation and maintenance of a temporal and spatial diversity of sialylated moieties. However, the growing evidence also suggests that in mammalian cells, at least equally important roles belong to sialidases/neuraminidases, which are located on the cell surface and in intracellular compartments, and may either initiate the catabolism of sialoglycoconjugates or just cleave their sialic acid residues, and thereby contribute to temporal changes in their structure and functions. The current review summarizes emerging data demonstrating that neuraminidase 1 (NEU1), well known for its lysosomal catabolic function, can be also targeted to the cell surface and assume the previously unrecognized role as a structural and functional modulator of cellular receptors.
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Sialidosis type I carrying V217M/G243R mutations in lysosomal sialidase: an autopsy study demonstrating terminal sialic acid in lysosomal lamellar inclusions and cerebellar dysplasia. Acta Neuropathol 2010; 119:135-45. [PMID: 19415310 DOI: 10.1007/s00401-009-0544-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 04/21/2009] [Accepted: 04/24/2009] [Indexed: 10/20/2022]
Abstract
Autopsy findings of a patient, with sialidosis type I phenotype carrying V217M/G243R mutations in the lysosomal sialidase gene and biochemically defined isolated sialidase deficiency, who died of intractable lymphoma at the age of 32 years, are described. Perikaryal expansion of cytoplasm was evident, mostly in motor neurons (in the anterior horn and the brain stem), dorsal root ganglia, cerebellar dentate neurons and some neurons in the thalamus and nucleus basalis of Meynert. The stored material was lamellar in lysosomes and exhibited a specific affinity to wheat germ agglutinin at light and electron microscopy, which indicates the accumulation of terminal sialic acid at the non-reducing end of the sugar chain in this pathological structure. Neuronal loss in these nuclei, however, was not frequent in spite of frequent and massive cytoplasmic expansion. Neocortex exhibited a mild spongiosis with some swelling of neurons, which contained lipofuscin-like granules and small amount of lamellar structures in lysosomes. This contrast suggests a discrepancy between the storage process and vulnerability of neurons, both variable according to areas examined. In the cerebellar vermis, dysplastic features, such as abnormal layering of Purkinje cells, thinning and rarefaction of the granule cell layer, incomplete formation of synapse and disordered proliferation of Bergmann's glia, were focally accentuated, suggesting some developmental abnormality not secondary to the storage process. This is the first autopsy demonstration of sialic acid in the lamellar materials and of a developmental abnormality in isolated sialidase deficiency. Additional studies are needed to clarify how this molecular abnormality leads to these morphological and clinical manifestations.
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Potapenko IO, Haakensen VD, Lüders T, Helland A, Bukholm I, Sørlie T, Kristensen VN, Lingjaerde OC, Børresen-Dale AL. Glycan gene expression signatures in normal and malignant breast tissue; possible role in diagnosis and progression. Mol Oncol 2009; 4:98-118. [PMID: 20060370 DOI: 10.1016/j.molonc.2009.12.001] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Revised: 12/02/2009] [Accepted: 12/02/2009] [Indexed: 01/24/2023] Open
Abstract
Glycosylation is the stepwise procedure of covalent attachment of oligosaccharide chains to proteins or lipids, and alterations in this process have been associated with malignant transformation. Simultaneous analysis of the expression of all glycan-related genes clearly gives the advantage of enabling a comprehensive view of the genetic background of the glycobiological changes in cancer cells. Studies focusing on the expression of the whole glycome have now become possible, which prompted us to review the present knowledge on glycosylation in relation to breast cancer diagnosis and progression, in the light of available expression data from tumors and breast tissue of healthy individuals. We used various data resources to select a set of 419 functionally relevant genes involved in synthesis, degradation and binding of N-linked and O-linked glycans, Lewis antigens, glycosaminoglycans (chondroitin, heparin and keratan sulfate in addition to hyaluronan) and glycosphingolipids. Such glycans are involved in a number of processes relevant to carcinogenesis, including regulation of growth factors/growth factor receptors, cell-cell adhesion and motility as well as immune system modulation. Expression analysis of these glycan-related genes revealed that mRNA levels for many of them differ significantly between normal and malignant breast tissue. An associative analysis of these genes in the context of current knowledge of their function in protein glycosylation and connection(s) to cancer indicated that synthesis, degradation and adhesion mediated by glycans may be altered drastically in mammary carcinomas. Although further analysis is needed to assess how changes in mRNA levels of glycan genes influence a cell's glycome and the precise role that such altered glycan structures play in the pathogenesis of the disease, lessons drawn from this study may help in determining directions for future research in the rapidly-developing field of glycobiology.
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Affiliation(s)
- Ivan O Potapenko
- Department of Genetics, Institute for Cancer Research, Oslo University Hospital Radiumhospitalet, 0310 Oslo, Norway
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Wang J, Wu G, Miyagi T, Lu ZH, Ledeen RW. Sialidase occurs in both membranes of the nuclear envelope and hydrolyzes endogenous GD1a. J Neurochem 2009; 111:547-54. [DOI: 10.1111/j.1471-4159.2009.06339.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Shiozaki K, Koseki K, Yamaguchi K, Shiozaki M, Narimatsu H, Miyagi T. Developmental change of sialidase neu4 expression in murine brain and its involvement in the regulation of neuronal cell differentiation. J Biol Chem 2009; 284:21157-64. [PMID: 19506080 DOI: 10.1074/jbc.m109.012708] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Sialidase Neu4 is reported to be dominantly expressed in the mouse brain, but its functional significance is not fully understood. We previously demonstrated that sialidase Neu3, also rich in mouse brain, is up-regulated during neuronal differentiation with involvement in acceleration of neurite formation. To elucidate physiological functions of Neu4, as well as Neu3, we determined expression during mouse brain development by quantitative RT-PCR. Expression was relatively low in the embryonic stage and then rapidly increased at 3-14 days after birth, whereas Neu3 demonstrated high levels in the embryonic stage and down-regulation after birth. Murine Neu4 was found to possess two isoforms differing in expression levels, developmental pattern, and enzymatic character. Distinct from the human isoforms, the murine forms, to a different extent, both catalyzed the removal of sialic acid from gangliosides as well as glycoproteins, and one isoform seemed to act on polysialylated NCAM efficiently, despite the low activity toward ordinary substrates. In situ hybridization demonstrated Neu4 mRNA to be present mainly in the hippocampus in which NCAM is rich and decreases after birth. During retinoic acid-induced differentiation, Neu4 expression was down-regulated in Neuro2a cells. Overexpression of Neu4 resulted in suppression of neurite formation, and its knockdown showed the acceleration. Thin layer chromatography of the glycolipids from Neu4-transfected cells showed ganglioside compositions to be only slightly affected, although lectin blot analysis revealed increased binding to Ricinus communis agglutinin (RCA) lectin of a approximately 95-kDa glycoprotein, which decreased with cell differentiation. These results suggest that mouse Neu4 plays an important regulatory role in neurite formation, possibly through desialylation of glycoproteins.
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Affiliation(s)
- Kazuhiro Shiozaki
- Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi 981-1293, Japan
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Martino S, di Girolamo I, Cavazzin C, Tiribuzi R, Galli R, Rivaroli A, Valsecchi M, Sandhoff K, Sonnino S, Vescovi A, Gritti A, Orlacchio A. Neural precursor cell cultures from GM2 gangliosidosis animal models recapitulate the biochemical and molecular hallmarks of the brain pathology. J Neurochem 2009; 109:135-47. [PMID: 19166507 DOI: 10.1111/j.1471-4159.2009.05919.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work we showed that genotype-related patterns of hexosaminidase activity, isoenzyme composition, gene expression and ganglioside metabolism observed during embryonic and postnatal brain development are recapitulated during the progressive stages of neural precursor cell (NPC) differentiation to mature glia and neurons in vitro. Further, by comparing NPCs and their differentiated progeny established from Tay-Sachs (TS) and Sandhoff (SD) animal models with the wild-type counterparts, we studied the events linking the accumulation of undegraded substrates to hexosaminidase activity. We showed that similarly to what observed in brain tissues in TS NPCs and progeny, the stored GM2 was partially converted by sialidase to GA2, which can be then degraded in the lysosomes to its components. The latter can be used in a salvage pathway for the formation of GM3. Interestingly, results obtained from ganglioside feeding assays and from measurement of lysosomal sialidase activity suggest that a similar pathway might work also in the SD model.
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Affiliation(s)
- Sabata Martino
- Dipartimento di Medicina Sperimentale e Scienze Biochimiche, Sezione di Biochimica e Biologia Molecolare, Università di Perugia, Perugia, Italy
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Contribution of sialidase NEU1 to suppression of metastasis of human colon cancer cells through desialylation of integrin beta4. Oncogene 2009; 28:1218-29. [PMID: 19151752 DOI: 10.1038/onc.2008.471] [Citation(s) in RCA: 142] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We previously found an inverse relationship between sialidase Neu1 expression and metastatic potential of murine cancer cells. To elucidate the mechanism underlying the cellular events, the human sialidase gene NEU1 was overexpressed or silenced in colon cancer HT-29 cells. When NEU1-overexpressing cells were injected transsplenically into mice, in vivo liver metastasis was significantly reduced. NEU1 suppressed cell migration, invasion and adhesion in vitro, whereas the silencing resulted in the opposite. One of the major molecular changes by NEU1 was decreased sialylation of integrin beta4, assessed by PNA- and MAL-II-lectin blotting of immunoprecipitates with anti-integrin beta4 antibody. The desialylation was accompanied by decreased phosphorylation of the integrin followed by attenuation of focal adhesion kinase and Erk1/2 pathway. Moreover, NEU1 caused downregulation of matrix metalloproteinase-7, overexpression of which is associated with cancer metastasis. Treatment of the cells with GalNAc-alpha-O-benzyl, an inhibitor of O-glycosylation, showed increased PNA-positive integrin beta4 with its decreased phosphorylation, indicating that sialic acid removal from the integrin O-glycans results in the decreased phosphorylation. Biotinylation and immunofluorescence staining exhibited some NEU1 molecules to be at the cell surface accessible to the integrin. These results suggest that NEU1 is important in regulation of integrin beta4-mediated signaling, leading to suppression of metastasis.
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Miyagi T, Wada T, Yamaguchi K, Shiozaki K, Sato I, Kakugawa Y, Yamanami H, Fujiya T. Human sialidase as a cancer marker. Proteomics 2008; 8:3303-11. [PMID: 18651674 DOI: 10.1002/pmic.200800248] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Altered sialylation of cell surface glycoproteins and glycolipids is closely related to the malignant phenotype of cancer cells, including the metastatic potential and invasiveness. Many cancer-related antigens in clinical use contain sialic acids at the terminal position of sugar chains in the molecules. To elucidate the molecular mechanism, we focused our investigation on sialidase, which catalyzes the removal of sialic acid residues from the glycoconjugates. Four types of human sialidases identified to date behave in different manners during carcinogenesis. One of the sialidases, found in the lysosomes, showed downregulation in cancers, promoting anchorage-independent growth, and metastatic ability, while another, found in the plasma membrane, showed marked upregulation, causing apoptosis suppression. It was found that estimation of the mRNA levels of sialidases by real-time PCR allowed discrimination of cancerous from noncancerous tissues and even determination of the pathological stage in some cancers. Immunohistochemistry of cancer tissues using the antibody against the plasma membrane sialidase was useful for clinical diagnosis. This paper briefly summarizes our findings of the altered sialidase expression in cancers and the possibility of their clinical application as cancer markers. Human sialidases are indeed related to malignancy and may be potential targets for cancer diagnosis and therapy.
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Affiliation(s)
- Taeko Miyagi
- Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, Japan.
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37
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Cells of rhabdomyosarcoma PA-23 tumor clones with high and low metastatic potential differ by activity of lysosomal sialidase. Bull Exp Biol Med 2008; 145:355-7. [PMID: 19039943 DOI: 10.1007/s10517-008-0090-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We studied activity of lysosomal sialidase in cells of rhabdomyosarcoma PA-23 tumor clones with high and low metastatic potential. Low activity of lysosomal sialidase was found in clones characterized by high metastatic potential.
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Hinek A, Bodnaruk TD, Bunda S, Wang Y, Liu K. Neuraminidase-1, a subunit of the cell surface elastin receptor, desialylates and functionally inactivates adjacent receptors interacting with the mitogenic growth factors PDGF-BB and IGF-2. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:1042-56. [PMID: 18772331 DOI: 10.2353/ajpath.2008.071081] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We recently established that the elastin-binding protein, which is identical to the spliced variant of beta-galactosidase, forms a cell surface-targeted complex with two proteins considered "classic lysosomal enzymes": protective protein/cathepsin A and neuraminidase-1 (Neu1). We also found that cell surface-residing Neu1 can desialylate neighboring microfibrillar glycoproteins and facilitate the deposition of insoluble elastin, which contributes to the maintenance of cellular quiescence. Here we provide evidence that cell surface-residing Neu1 contributes to a novel mechanism that limits cellular proliferation by desialylating cell membrane-residing sialoglycoproteins that directly propagate mitogenic signals. We demonstrated that treatment of cultured human aortic smooth muscle cells (SMCs) with either a sialidase inhibitor or an antibody that blocks Neu1 activity induced significant up-regulation in SMC proliferation in response to fetal bovine serum. Conversely, treatment with Clostridium perfringens neuraminidase (which is highly homologous to Neu1) decreased SMC proliferation, even in cultures that did not deposit elastin. Further, we found that pretreatment of aortic SMCs with exogenous neuraminidase abolished their mitogenic responses to recombinant platelet-derived growth factor (PDGF)-BB and insulin-like growth factor (IGF)-2 and that sialidosis fibroblasts (which are exclusively deficient in Neu1) were more responsive to PDGF-BB and IGF-2 compared with normal fibroblasts. Furthermore, we provide direct evidence that neuraminidase caused the desialylation of both PDGF and IGF-1 receptors and diminished the intracellular signals induced by the mitogenic ligands PDGF-BB and IGF-2.
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Affiliation(s)
- Aleksander Hinek
- Department of Laboratory Medicine and Pathobiology, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.
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Abstract
Abstract
Introduction
Glycans have unique characteristics that are significantly different from nucleic acids and proteins in terms of biosynthesis, structures, and functions. Moreover, their isomeric nature and the complex linkages between residues have made glycan analysis a challenging task. Disease development and progression are usually associated with alternations in glycosylation on tissue proteins and/or blood proteins. Glycans released from tissue/blood proteins hence provide a valuable source of biomarkers. In this postgenome era, glycomics is an emerging research field. Glycome refers to a repertoire of glycans in a tissue/cell type, while glycomics is the study of glycome. In the past few years, attempts have been made to develop novel methodologies for quantitative glycomic profiling and to identify potential glycobiomarkers. It can be foreseen that glycomics holds the promise for biomarker discovery. This review provides an overview of the unique features of glycans and the historical applications of such features to biomarker discovery.
Future Prospective
The concept of glycomics and its recent advancement and future prospective in biomarker research are reviewed. Above all, there is no doubt that glycomics is gaining momentum in biomarker research.
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Miyagi T. Aberrant expression of sialidase and cancer progression. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2008; 84:407-418. [PMID: 19075514 PMCID: PMC3720545 DOI: 10.2183/pjab.84.407] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Accepted: 09/30/2008] [Indexed: 05/27/2023]
Abstract
Aberrant sialylation is closely associated with the malignant phenotype of cancer cells including metastatic potential and invasiveness. However, its biological significance and molecular mechanisms have yet to be fully elucidated. To determine causes and consequences, we have focused attention on mammalian sialidases, which cleave sialic acids from gangliosides and glycoproteins. The four types of human sialidases identified to date behave in different manners during carcinogenesis. One, found in the lysosomes, shows down-regulation in cancers, promoting anchorage-independent growth and contributing to metastatic ability, while another, found in the plasma membranes, exhibits marked up-regulation, resulting in suppression of apoptosis. The present review summarizes mostly our results on aberrant expression of sialidases and their possible roles in cancer progression.
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Affiliation(s)
- Taeko Miyagi
- Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, Japan.
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41
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Tringali C, Anastasia L, Papini N, Bianchi A, Ronzoni L, Cappellini MD, Monti E, Tettamanti G, Venerando B. Modification of sialidase levels and sialoglycoconjugate pattern during erythroid and erytroleukemic cell differentiation. Glycoconj J 2007; 24:67-79. [PMID: 17139558 DOI: 10.1007/s10719-006-9013-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Glycosphingolipids and glycoproteins play pivotal roles in the complex series of events governing cell adhesion and signal transduction. Aberrant glycosilation, typical of tumor cells, represents a key event in the induction of invasion and metastasis. Sialidases remove sialic acid residues from sialoconjugates and, in mammals, these enzymes have been proved to be involved in several cellular phenomena, including cell proliferation and differentiation, membrane function, and malignant transformation. Herein we show that only the lysosomal sialidase Neu1 and the plasma membrane-associated sialidase Neu3 are expressed in CFU-E erythroid precursors and K562 erythroleukemic cells. Tumour cells show much higher expression levels than CFU-E cells and, during differentiation, the content of the two enzymes progressively decreases. The sialoglycoconjugate pattern is different in the two cell types. In fact, the differentiating erythroid precursors show an increase of the typical erythrocyte sphingolipids, whereas K562 cells treated with butyrate show a marked increase of GD1a, GM2, PE, and ceramide. Finally, during differentiation the sialoglycoprotein content of erythroid cells shows a marked increase, and in K562 cells the process induces the synthesis of some sialoglycoprotein typical of the erythroid membrane. Overall, these results point out the great differences in sialoglycoconjugate and sialidase patterns exhibited by normal and tumour cells.
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Affiliation(s)
- Cristina Tringali
- Department of Medical Chemistry, Biochemistry and Biotechnology, Faculty of Exercise Science, University of Milan, LITA-Segrate, via Fratelli Cervi 93, 20090 Segrate, Milan, Italy
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Tseng HC, Chow SN, Huang LY, Chien CH. Desialylation of human cancer cells leading apoptosis by treatment with purified and overexpressed nanI cloned from Clostridium perfringens ATCC 10543. Enzyme Microb Technol 2007. [DOI: 10.1016/j.enzmictec.2006.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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43
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Tringali C, Lupo B, Anastasia L, Papini N, Monti E, Bresciani R, Tettamanti G, Venerando B. Expression of sialidase Neu2 in leukemic K562 cells induces apoptosis by impairing Bcr-Abl/Src kinases signaling. J Biol Chem 2007; 282:14364-72. [PMID: 17374613 DOI: 10.1074/jbc.m700406200] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Chronic myeloid leukemia is a hematopoietic stem cell cancer, originated by the perpetually "switched on" activity of the tyrosine kinase Bcr-Abl, leading to uncontrolled proliferation and insensitivity to apoptotic stimuli. The genetic phenotype of myeloid leukemic K562 cells includes the suppression of cytosolic sialidase Neu2. Neu2 transfection in K562 cells induced a marked decrease (-30% and -80%) of the mRNA of the anti-apoptotic factors Bcl-XL and Bcl-2, respectively, and an almost total disappearance of Bcl-2 protein. In addition, gene expression and activity of Bcr-Abl underwent a 35% diminution, together with a marked decrease of Bcr-Abl-dependent Src and Lyn kinase activity. Thus, the antiapoptotic axis Bcr-Abl, Src, and Lyn, which stimulates the formation of Bcl-XL and Bcl-2, was remarkably weakened. The ultimate consequences of these modifications were an increased susceptibility to apoptosis of K562 cells and a marked reduction of their proliferation rate. The molecular link between Neu2 activity and Bcr-Abl signaling pathway may rely on the desialylation of some cytosolic glycoproteins. In fact, three cytosolic glycoproteins, in the range 45-66 kDa, showed a 50-70% decrease of their sialic acid content upon Neu2 expression, supporting their possible role as modulators of the Bcr-Abl complex.
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Affiliation(s)
- Cristina Tringali
- Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, LITA via Fratelli Cervi 93, Segrate, Milan, Italy
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Yamanami H, Shiozaki K, Wada T, Yamaguchi K, Uemura T, Kakugawa Y, Hujiya T, Miyagi T. Down-regulation of sialidase NEU4 may contribute to invasive properties of human colon cancers. Cancer Sci 2007; 98:299-307. [PMID: 17270019 PMCID: PMC11159927 DOI: 10.1111/j.1349-7006.2007.00403.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In mammalian cells, four types of sialidase have been described and found to behave in different ways during carcinogenesis. We previously demonstrated that a human sialidase associated with plasma membranes (NEU3) is up-regulated in human colon cancer and is involved in suppression of apoptosis. Here we document altered expression of another human sialidase, the recently identified NEU4, and evidence of its influence on the malignant phenotype in colon cancers. Human colon mucosa was relatively rich in NEU4, which has been observed to possess short and long isoforms, but hardly contained the latter form. In clear contrast to the NEU3 case, the levels of mRNA for this sialidase were found by quantitative RT-PCR to be markedly decreased in colon cancers. In cultured human colon cancer cells, the enzyme was up-regulated in the early stage of apoptosis induced by either the death ligand TRAIL or serum-depletion, and transfection of NEU4 resulted in acceleration of apoptosis and in decreased invasion and motility. The siRNA-mediated NEU4 targeting, on the other hand, caused a significant inhibition of apoptosis and promotion of invasion and motility. Lectin blot analyses revealed that desialylated forms of nearly 100 kDa glycoproteins were prominently increased with PNA in NEU4 transfectants, whereas only slight changes in glycolipids were detected as assessed by thin layer chromatography. These results suggest that NEU4 plays important roles for maintenance of normal mucosa mostly through desialylation of glycoproteins and that down-regulation may contribute to invasive properties of colon cancers.
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Affiliation(s)
- Hideaki Yamanami
- Division of Biochemistry, Miyagi Cancer Center Research Institute, Miyagi Cancer Center, 47-1 Nodayama, Medeshima-shiode, Natori, Miyagi, 981-1293, Japan
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Ngantung FA, Miller PG, Brushett FR, Tang GL, Wang DIC. RNA interference of sialidase improves glycoprotein sialic acid content consistency. Biotechnol Bioeng 2006; 95:106-19. [PMID: 16673415 DOI: 10.1002/bit.20997] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
An important challenge facing therapeutic protein production in mammalian cell culture is the cleavage of terminal sialic acids on recombinant protein glycans by the glycosidase enzymes released by lysed cells into the supernatant. This undesired phenomenon results in a protein product which is rapidly cleared from the plasma by asialoglycoprotein receptors in the liver. In this study, RNA interference was utilized as a genetic approach to silence the activity of sialidase, a glycosidase responsible for cleaving terminal sialic acids on IFN-gamma produced by Chinese Hamster Ovary (CHO) cells. We first identified a 21-nt double stranded siRNA that reduced endogenous sialidase mRNA and protein activity levels. Potency of each siRNA sequences was compared using real time RT-PCR and a sialidase activity assay. We next integrated the siRNA sequence into CHO cells, allowing production and selection of stable cell lines. We isolated stable clones with sialidase activity reduced by over 60% as compared to the control cell line. Micellar electrokinetic chromatography (MEKC), thiobarbituric acid assay (TAA), and high performance anion exchange chromatography (HPAEC) coupled to amperometric detection were performed to analyze glycan site occupancy, sialic acid content, and distribution of asialo-/sialylated-glycan structures, respectively. Two of the stable clones successfully retained the full sialic acid content of the recombinant IFN-gamma, even upon cells' death. This was comparable to the case where a chemically synthesized sialidase inhibitor was used. These results demonstrated that RNA interference of sialidase can prevent the desialylation problem in glycoprotein production, resulting improved protein quality during the entire cell culture process.
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Affiliation(s)
- Frederyk A Ngantung
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Yamaguchi K, Hata K, Koseki K, Shiozaki K, Akita H, Wada T, Moriya S, Miyagi T. Evidence for mitochondrial localization of a novel human sialidase (NEU4). Biochem J 2005; 390:85-93. [PMID: 15847605 PMCID: PMC1184564 DOI: 10.1042/bj20050017] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Based on the human cDNA sequence predicted to represent the NEU4 sialidase gene in public databases, a cDNA covering the entire coding sequence was isolated from human brain and expressed in mammalian cells. The cDNA encodes two isoforms: one possessing an N-terminal 12-amino-acid sequence that is predicted to be a mitochondrial targeting sequence, and the other lacking these amino acids. Expression of the isoforms is tissue specific, as assessed by reverse transcription-PCR. Brain, muscle and kidney contained both isoforms; liver showed the highest expression, and the short form was predominant in this organ. In transiently transfected COS-1 cells, enzyme activity was markedly increased with gangliosides as well as with glycoproteins and oligosaccharides as substrates compared with the control levels. This differs from findings with other human sialidases. Although the isoforms were not distinguishable with regard to substrate specificity, they exhibited differential subcellular localizations. Immunofluorescence microscopy and biochemical fractionation demonstrated that an exogenously expressed haemagglutinin-tagged long form of NEU4 was concentrated in mitochondria in several human culture cell types, whereas the short form was present in intracellular membranes, indicating that the sequence comprising the N-terminal 12 amino acid residues acts as a targeting signal for mitochondria. Co-localization of the long form to mitochondria was further supported by efficient targeting of the N-terminal region fused to enhanced green fluorescent protein, and by the targeting failure of a mutant with an amino acid substitution in this region. NEU4 is possibly involved in regulation of apoptosis by modulation of ganglioside G(D3), which accumulates in mitochondria during apoptosis and is the best substrate for the sialidase.
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Affiliation(s)
- Kazunori Yamaguchi
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
| | - Keiko Hata
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
- †CREST, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
| | - Koichi Koseki
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
| | - Kazuhiro Shiozaki
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
- †CREST, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
| | - Hirotoshi Akita
- ‡Second Department of Oral Anatomy, School of Dentistry, Tohoku University, Sendai, 980-8575, Japan
| | - Tadashi Wada
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
- †CREST, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
| | - Setsuko Moriya
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
| | - Taeko Miyagi
- *Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
- †CREST, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
- To whom correspondence should be addressed (email )
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Abstract
Aberrant sialylation in cancer cells is thought to be a characteristic feature associated with malignant properties including invasiveness and metastatic potential. Sialidase which catalyzes the removal of sialic acid residues from glycoproteins and glycolipids, has been suggested to play important roles in many biological processes through regulation of cellular sialic acid contents. The altered expression of sialidase observed in cancer would, therefore, suggest its involvement in the malignant process. In mammalian cells, three types of sialidase cloned and characterized to date were found to behave in different manners during carcinogenesis. Recent progress in molecular cloning of these sialidases has facilitated elucidation of the molecular mechanisms and significance of these alterations. Herein we briefly describe our own studies on sialidase changes associated with malignant transformation and summarize the topic from both a retrospective and a prospective viewpoint. Sialidases are indeed closely related to malignancy and are thus potential targets for cancer diagnosis and therapy.
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Affiliation(s)
- Taeko Miyagi
- Division of Biochemistry, Research Institute, Miyagi Prefectural Cancer Center, Natori, Miyagi 981-1293, Japan.
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Suriano R, Ghosh SK, Ashok BT, Mittelman A, Chen Y, Banerjee A, Tiwari RK. Differences in Glycosylation Patterns of Heat Shock Protein, gp96: Implications for Prostate Cancer Prevention. Cancer Res 2005; 65:6466-75. [PMID: 16024652 DOI: 10.1158/0008-5472.can-04-4639] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Heat shock protein gp96 induces a tumor-specific protective immunity in a variety of experimental tumor models. Because the primary sequences of the glycoprotein, gp96 are identical between tumor and normal tissues, the peptides associated with gp96 and/or the posttranslational modifications of gp96, determine its immunogenicity. Gp96-associated peptides constitute the antigenic repertoire of the source tissue; thus, purified gp96-peptide complexes have clinical significance as autologous cancer vaccines. However, the role of altered glycosylation and its contribution in the biological as well as immunologic activity of gp96 still remains uncharacterized. We examined the cancer-specific glycosylation patterns of gp96. To this end, monosaccharide compositions of gp96 were compared between normal rat prostate and two cancerous rat prostate tissues, nonmetastatic/androgen-dependent Dunning G and metastatic/androgen-independent MAT-LyLu, as well as two human nonmetastatic prostate cancer cell lines, androgen-dependent LnCaP and androgen-independent DU145. Marked differences were observed between the gp96 monosaccharide compositions of the normal and cancerous tissues. Furthermore, gp96 molecules from more aggressive cellular transformations were found to carry decreasing quantities of several monosaccharides as well as sum total content of neutral and amino sugars. We believe that the unique glycosylation patterns contribute to cellular phenotype and that the posttranslational modifications of gp96 may affect its functional attributes.
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Affiliation(s)
- Robert Suriano
- Department of Microbiology and Immunology, New York Medical College, Valhalla, New York 10595, USA
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Fanzani A, Colombo F, Giuliani R, Preti A, Marchesini S. Cytosolic sialidase Neu2 upregulation during PC12 cells differentiation. FEBS Lett 2004; 566:178-82. [PMID: 15147891 DOI: 10.1016/j.febslet.2004.03.115] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2004] [Revised: 03/19/2004] [Accepted: 03/31/2004] [Indexed: 11/18/2022]
Abstract
The cytosolic sialidase Neu2 is known to be involved in myoblast differentiation. Here, we observed a Neu2 transcriptional induction during nerve growth factor, fibroblast growth factor 2 and epidermal growth factor treatments of PC12 cells, a favored model to study neuronal differentiation. The expression analysis of Neu2 deleted promoter revealed a remarkable increase of luciferase activity in treated PC12 cells, suggesting that in this cell line the Neu2 transcriptional levels are highly regulated. The enzymatic activity of cytosolic sialidase Neu2 was found to increase transiently only during differentiation, whereas was undetectable in untreated PC12 cells. These data suggest a possible involvement of cytosolic sialidase Neu2 in differentiation of PC12 cells.
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Affiliation(s)
- A Fanzani
- Department of Biomedical Sciences and Biotechnology, Unit of Biochemistry, University of Brescia, Viale Europa 11, 25123 Brescia, Italy.
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Abstract
Cytosolic sialidase Neu2 has been implicated in myoblast differentiation. Here we observed a significant upregulation of Neu2 expression during differentiation of murine C2C12 myoblasts. This was evidenced both as an increase in Neu2 mRNA steady-state levels and in the cytosolic sialidase enzymatic activity. To understand the biological significance of Neu2 upregulation in myoblast differentiation, C2C12 cells were stably transfected with the rat cytosolic sialidase Neu2 cDNA. Neu2 overexpressing clones were characterized by a marked decrement of cell proliferation and by the capacity to undergo spontaneous myoblast differentiation also when maintained under standard growth conditions. This was evidenced by the formation of myogenin-positive myotubes and by a significant decrease in the nuclear levels of cyclin D1 protein. No differentiation was on the contrary observed in parental and mock-transfected cells under the same experimental conditions. The results indicate that Neu2 upregulation per se is sufficient to trigger myoblast differentiation in C2C12 cells.
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