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An SY, Lee JW, Kim HD, Kim KS, Cho JH, Kim CH, Lee YC. Regulatory mechanism for the human glioblastoma cell-specific expression of the human GD1c/GT1a/GQ1b synthase (hST8Sia V) gene. Glycoconj J 2023; 40:621-630. [PMID: 37921922 DOI: 10.1007/s10719-023-10136-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 10/05/2023] [Accepted: 10/19/2023] [Indexed: 11/05/2023]
Abstract
In this study we observed that human GD1c/GT1a/GQ1b synthase (hST8Sia V) is particularly expressed in human glioblastoma cells. To address the mechanism regulating human glioblastoma-specific gene expression of the hST8Sia V, after the transcription start site (TSS) was identified by the 5'-rapid amplification of cDNA end with total RNA from human glioblastoma U87MG cells, the 5'-flanking region (2.5 kb) of the hST8Sia V gene was isolated and its promoter activity was examined. By luciferase reporter assay, this 5'-flanking region revealed strong promoter activity in only U-87MG cells, but not in other tissue-derived cancer cells. 5'-deletion mutant analysis showed that the region from -1140 to -494 is crucial for transcription of the hST8Sia V gene in U87MG cells. This region contains the activator protein-1 (AP-1) binding site, the main target of the c-Jun N-terminal kinase (JNK) downstream. The AP-1 binding site at -1043/-1037 was proved to be indispensable for the hST8Sia V gene-specific expression in U87MG cells by site-directed mutagenesis. Moreover, the transcriptional activation of hST8Sia V gene in U87MG cells was strongly inhibited by a specific JNK inhibitor, SP600125. These results suggest that the hST8Sia V gene-specific expression in U87MG cells is controlled by JNK/AP-1 signaling pathway.
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Affiliation(s)
- So-Young An
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea
| | - Ji-Won Lee
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea
| | - Hee-Do Kim
- Molecular and Cellular Glycobiology Unit, Department of Biological Sciences, SungKyunKwan University, Kyunggi-Do, 16419, South Korea
| | - Kyoung-Sook Kim
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea
| | - Jong-Hyun Cho
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea
| | - Cheorl-Ho Kim
- Molecular and Cellular Glycobiology Unit, Department of Biological Sciences, SungKyunKwan University, Kyunggi-Do, 16419, South Korea.
| | - Young-Choon Lee
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea.
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An SY, Yoon HK, Kim KS, Kim HD, Cho JH, Kim HJ, Kim CH, Lee YC. Upregulation of human GD3 synthase (hST8Sia I) gene expression during serum starvation-induced osteoblastic differentiation of MG-63 cells. PLoS One 2023; 18:e0293321. [PMID: 37917776 PMCID: PMC10621931 DOI: 10.1371/journal.pone.0293321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/09/2023] [Indexed: 11/04/2023] Open
Abstract
In this study, we have firstly elucidated that serum starvation augmented the levels of human GD3 synthase (hST8Sia I) gene and ganglioside GD3 expression as well as bone morphogenic protein-2 and osteocalcin expression during MG-63 cell differentiation using RT-PCR, qPCR, Western blot and immunofluorescence microscopy. To evaluate upregulation of hST8Sia I gene during MG-63 cell differentiation by serum starvation, promoter area of the hST8Sia I gene was functionally analyzed. Promoter analysis using luciferase reporter assay system harboring various constructs of the hST8Sia I gene proved that the cis-acting region at -1146/-646, which includes binding sites of the known transcription factors AP-1, CREB, c-Ets-1 and NF-κB, displays the highest level of promoter activity in response to serum starvation in MG-63 cells. The -731/-722 region, which contains the NF-κB binding site, was proved to be essential for expression of the hST8Sia I gene by serum starvation in MG-63 cells by site-directed mutagenesis, NF-κB inhibition, and chromatin immunoprecipitation (ChIP) assay. Knockdown of hST8Sia I using shRNA suggested that expressions of hST8Sia I and GD3 have no apparent effect on differentiation of MG-63 cells. Moreover, the transcriptional activation of hST8Sia I gene by serum starvation was strongly hindered by SB203580, a p38MAPK inhibitor in MG-63 cells. From these results, it has been suggested that transcription activity of hST8Sia I gene by serum starvation in human osteosarcoma MG-63 cells is regulated by p38MAPK/NF-κB signaling pathway.
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Affiliation(s)
- So-Young An
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Hyun-Kyoung Yoon
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Kyoung-Sook Kim
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Hee-Do Kim
- Molecular and Cellular Glycobiology Unit, Department of Biological Sciences, SungKyunKwan University, Kyunggi-Do, South Korea
| | - Jong-Hyun Cho
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Hyeon-Jun Kim
- Department of Orthopaedic Surgery, College of Medicine, Dong-A University, Busan, South Korea
| | - Cheorl-Ho Kim
- Molecular and Cellular Glycobiology Unit, Department of Biological Sciences, SungKyunKwan University, Kyunggi-Do, South Korea
| | - Young-Choon Lee
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
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Guo Y, Wang P, Jiang L, Deng C, Zheng L, Song C, Jiao J. Multifunctional Proximity Labeling Strategy for Lipid Raft-Specific Sialic Acid Tracking and Engineering. Bioconjug Chem 2023; 34:1719-1726. [PMID: 37767911 DOI: 10.1021/acs.bioconjchem.3c00236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Abstract
Lipid raft-specific glycosylation has been implicated in many biological processes, including intracellular trafficking, cell adhesion, signal transduction, and host-pathogen interactions. The major predicament in lipid raft-specific glycosylation research is the unavailability of tools for tracking and manipulating glycans on lipid rafts at the microstructural level. To overcome this challenge, we developed a multifunctional proximity labeling (MPL) platform that relies on cholera toxin B subunit to localize horseradish peroxidase on lipid rafts. In addition to the prevailing electron-rich amino acids, modified sialic acid was included in the horseradish peroxidase-mediated proximity labeling substrate via purposefully designed chemical transformation reactions. In combination with sialic acid editing, the self-renewal of lipid raft-specific sialic acid was visualized. The MPL method enabled tracking of lipid raft dynamics under methyl-β-cyclodextrin and mevinolin treatments; in particular, the alteration of lipid rafts markedly affected cell migration. Furthermore, we embedded functional molecules into the method and implemented raft-specific sialic acid gradient engineering. Our novel strategy presents opportunities for tailoring lipid raft-specific sialic acids, thereby regulating interactions associated with lipid raft regions (such as cell-virus and cell-microenvironment interactions), and can aid in the development of lipid raft-based therapeutic regimens for tumors.
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Affiliation(s)
- Yuna Guo
- Medical Science and Technology Innovation Center, Shandong First Medical University, Jinan 250117, China
| | - Pingping Wang
- School of Pharmacy and Pharmaceutical Sciences, Shandong First Medical University, Jinan 250117, China
| | - Liangyu Jiang
- School of Clinical and Basic Medical Sciences, Shandong First Medical University, Jinan 250117, China
| | - Chaowen Deng
- School of Clinical and Basic Medical Sciences, Shandong First Medical University, Jinan 250117, China
| | - Lei Zheng
- School of Pharmacy and Pharmaceutical Sciences, Shandong First Medical University, Jinan 250117, China
| | - Cong Song
- Medical Science and Technology Innovation Center, Shandong First Medical University, Jinan 250117, China
| | - Jianwei Jiao
- Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing 210023, China
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An SY, Kim KS, Lee YC, Kim SH. Transcription of human β-galactoside α2,6-sialyltransferase (hST6Gal I) is downregulated by curcumin through AMPK signaling in human colon carcinoma HCT116 cells. Genes Genomics 2023; 45:901-909. [PMID: 37231294 DOI: 10.1007/s13258-023-01398-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 05/08/2023] [Indexed: 05/27/2023]
Abstract
BACKGROUND In this study, we observed that in human colon carcinoma HCT116 cells mRNA level of the human β-galactoside α2,6-sialyltransferase (hST6Gal I) was decreased by curcumin. FACS analysis using the α2,6-sialyl-specific lectin (SNA) also showed a noticeable decrease in binding to SNA by curcumin. OBJECTIVE To investigate the mechanism for curcumin-triggered downregulation of hST6Gal I transcription. METHODS The mRNA levels of nine kinds of hST genes were assessed by RT-PCR after curcumin was treated in HCT116 cells. The level of hST6Gal I product on cell surface was examined by flow cytometry analysis. Luciferase reporter plasmids with 5'-deleted constructs and mutants of the hST6Gal I promoter were transiently transfected into HCT116 cells, and the luciferase activity was measured after treatment with curcumin. RESULTS Curcumin led to significant transcriptional repression of the hST6Gal I promoter. Promoter analysis using deletion mutants proved that the - 303 to - 189 region of the hST6Gal I promoter is required for transcriptional repression in response to curcumin. Among putative binding sites for transcription factors IK2, GATA1, TCF12, TAL1/E2A, SPT, and SL1 in this region, by site-directed mutagenesis analysis the TAL/E2A binding site (nucleotides - 266/- 246) was proved to be crucial for curcumin-triggered downregulation of hST6Gal I transcription in HCT116 cells. The transcription activity of hST6Gal I gene in HCT116 cells was markedly suppressed by compound C, an AMP-activated protein kinase (AMPK) inhibitor. CONCLUSION These indicate that gene expression of hST6Gal I in HCT116 cells is controlled through AMPK/TAL/E2A signal pathway.
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Affiliation(s)
- So-Young An
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea
| | - Kyoung-Sook Kim
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea
| | - Young-Choon Lee
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea.
| | - Seok-Ho Kim
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, 49315, South Korea.
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An SY, Kim KS, Cho JH, Kim HD, Kim CH, Lee YC. Curcumin-mediated transcriptional regulation of human N-acetylgalactosamine-α2,6-sialyltransferase which synthesizes sialyl-Tn antigen in HCT116 human colon cancer cells. Front Mol Biosci 2022; 9:985648. [PMID: 36172045 PMCID: PMC9510914 DOI: 10.3389/fmolb.2022.985648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 08/18/2022] [Indexed: 11/13/2022] Open
Abstract
Human N-acetylgalactosamine-α2,6-sialyltransferase (hST6GalNAc I) is the major enzyme involved in the biosynthesis of sialyl-Tn antigen (sTn), which is known to be expressed in more than 80% of human carcinomas and correlated with poor prognosis in cancer patients. Athough high expression of hST6GalNAc I is associated with augmented proliferation, migration and invasion in various cancer cells, transcriptional mechanism regulating hST6GalNAc I gene expression remains largely unknown. In this study, we found that hST6GalNAc I gene expression was markedly augmented by curcumin in HCT116 human colon carcinoma cells. To understand the molecular mechanism for the upregulation of hST6GalNAc I gene expression by curcumin in HCT116 cells, we first determined the transcriptional start site of hST6GalNAc I gene by 5'-RACE and cloned the proximal hST6GalNAc I 5'-flanking region spanning about 2 kb by PCR. Functional analysis of the hST6GalNAc I 5' flanking region of hST6GalNAc I by sequential 5'-deletion, transient transfection of reporter gene constructs and luciferase reporter assays showed that -378/-136 region is essential for maximal activation of transcription in response to curcumin in HCT 116 cells. This region includes putative binding sites for transcription factors c-Ets-1, NF-1, GATA-1, ER-α, YY1, and GR-α. ChIP analysis and site-directed mutagenesis demonstrated that estrogen receptor α (ER-α) binding site (nucleotides -248/-238) in this region is crucial for hST6GalNAc I gene transcription in response to curcumin stimulation in HCT116 cells. The transcription activity of hST6GalNAc I gene induced by curcumin in HCT116 cells was strongly inhibited by PKC inhibitor (Gö6983) and ERK inhibitor (U0126). These results suggest that curcumin-induced hST6GalNAc I gene expression in HCT116 cells is modulated through PKC/ERKs signal pathway.
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Affiliation(s)
- So-Young An
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Kyoung-Sook Kim
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Jong-Hyun Cho
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
| | - Hee-Do Kim
- Molecular and Cellular Glycobiology Unit, Department of Biological Sciences, SungKyunKwan University, Kyunggi-Do, South Korea
| | - Cheorl-Ho Kim
- Molecular and Cellular Glycobiology Unit, Department of Biological Sciences, SungKyunKwan University, Kyunggi-Do, South Korea
| | - Young-Choon Lee
- Department of Medicinal Biotechnology, College of Health Sciences, Dong-A University, Busan, South Korea
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