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Qin H, Liu J, Yu M, Wang H, Thomas AM, Li S, Yan Q, Wang L. FUT7 promotes the malignant transformation of follicular thyroid carcinoma through α1,3-fucosylation of EGF receptor. Exp Cell Res 2020; 393:112095. [PMID: 32442537 DOI: 10.1016/j.yexcr.2020.112095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/18/2020] [Accepted: 05/18/2020] [Indexed: 02/07/2023]
Abstract
Aberrant protein glycosylation is involved in many diseases including cancer. This study investigated the role of fucosyltransferase VII (FUT7) in the progression of follicular thyroid carcinoma (FTC). FUT7 expression was found to be upregulated in FTC compared to paracancerous thyroid tissue, and in FTC with T2 stage of TMN classification compared to FTC with T1 stage. FUT7 overexpression promoted cell proliferation, epithelial-mesenchymal transition (EMT), and the migration and invasion of primary FTC cell line FTC-133. Consistently, FUT7 knock-down inhibited cell proliferation, EMT, as well as the migration and invasion of the metastatic FTC cell line FTC-238. Mechanistic investigation revealed that FUT7 catalyzed the α1,3-fucosylation of epidermal growth factor receptor (EGFR) in FTC cells. The extent of glycan α1,3-fucosylation on EGFR was positively correlated with the activation of EGFR in the presence/absence of epidermal growth factor (EGF) treatment. Furthermore, FUT7 was shown to enhance EGF-induced progression of FTC cells through mitogen-activated protein kinase (MAPK) and phosphatidylinositol-3-kinase (PI3K)/Akt signaling pathways. These findings provide a new perspective on FUT7 that may be a novel diagnostic and therapeutic target of FTC.
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Affiliation(s)
- Huamin Qin
- Department of Pathology, The Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Jianwei Liu
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Liaoning Provincial Core Lab of Glycobiology and Glycoengineering, Dalian, China
| | - Ming Yu
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Liaoning Provincial Core Lab of Glycobiology and Glycoengineering, Dalian, China
| | - Hao Wang
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Liaoning Provincial Core Lab of Glycobiology and Glycoengineering, Dalian, China
| | - Aline M Thomas
- The Russell H. Morgan Department of Radiology and Radiological Sciences, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Shen Li
- Department of Neurology, Dalian Municipal Central Hospital Affiliated of Dalian Medical University, Dalian, China
| | - Qiu Yan
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Liaoning Provincial Core Lab of Glycobiology and Glycoengineering, Dalian, China.
| | - Lifen Wang
- Department of Pathology, The Second Affiliated Hospital of Dalian Medical University, Dalian, China.
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Mikolajczyk K, Kaczmarek R, Czerwinski M. How glycosylation affects glycosylation: the role of N-glycans in glycosyltransferase activity. Glycobiology 2020; 30:941-969. [PMID: 32363402 DOI: 10.1093/glycob/cwaa041] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 04/22/2020] [Accepted: 04/24/2020] [Indexed: 12/15/2022] Open
Abstract
N-glycosylation is one of the most important posttranslational modifications of proteins. It plays important roles in the biogenesis and functions of proteins by influencing their folding, intracellular localization, stability and solubility. N-glycans are synthesized by glycosyltransferases, a complex group of ubiquitous enzymes that occur in most kingdoms of life. A growing body of evidence shows that N-glycans may influence processing and functions of glycosyltransferases, including their secretion, stability and substrate/acceptor affinity. Changes in these properties may have a profound impact on glycosyltransferase activity. Indeed, some glycosyltransferases have to be glycosylated themselves for full activity. N-glycans and glycosyltransferases play roles in the pathogenesis of many diseases (including cancers), so studies on glycosyltransferases may contribute to the development of new therapy methods and novel glycoengineered enzymes with improved properties. In this review, we focus on the role of N-glycosylation in the activity of glycosyltransferases and attempt to summarize all available data about this phenomenon.
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Affiliation(s)
- Krzysztof Mikolajczyk
- Laboratory of Glycobiology, Hirszfeld Institute of Immunology and Experimental Therapy, Weigla 12, 53-114 Wroclaw, Poland
| | - Radoslaw Kaczmarek
- Laboratory of Glycobiology, Hirszfeld Institute of Immunology and Experimental Therapy, Weigla 12, 53-114 Wroclaw, Poland
| | - Marcin Czerwinski
- Laboratory of Glycobiology, Hirszfeld Institute of Immunology and Experimental Therapy, Weigla 12, 53-114 Wroclaw, Poland
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Tinoco R, Carrette F, Henriquez ML, Fujita Y, Bradley LM. Fucosyltransferase Induction during Influenza Virus Infection Is Required for the Generation of Functional Memory CD4 + T Cells. THE JOURNAL OF IMMUNOLOGY 2018; 200:2690-2702. [PMID: 29491007 DOI: 10.4049/jimmunol.1701251] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 02/04/2018] [Indexed: 11/19/2022]
Abstract
T cells mediating influenza viral control are instructed in lymphoid and nonlymphoid tissues to differentiate into memory T cells that confer protective immunity. The mechanisms by which influenza virus-specific memory CD4+ T cells arise have been attributed to changes in transcription factors, cytokines and cytokine receptors, and metabolic programming. The molecules involved in these biosynthetic pathways, including proteins and lipids, are modified to varying degrees of glycosylation, fucosylation, sialation, and sulfation, which can alter their function. It is currently unknown how the glycome enzymatic machinery regulates CD4+ T cell effector and memory differentiation. In a murine model of influenza virus infection, we found that fucosyltransferase enzymatic activity was induced in effector and memory CD4+ T cells. Using CD4+ T cells deficient in the Fut4/7 enzymes that are expressed only in hematopoietic cells, we found decreased frequencies of effector cells with reduced expression of T-bet and NKG2A/C/E in the lungs during primary infection. Furthermore, Fut4/7-/- effector CD4+ T cells had reduced survival with no difference in proliferation or capacity for effector function. Although Fut4/7-/- CD4+ T cells seeded the memory pool after primary infection, they failed to form tissue-resident cells, were dysfunctional, and were unable to re-expand after secondary infection. Our findings highlight an important regulatory axis mediated by cell-intrinsic fucosyltransferase activity in CD4+ T cell effectors that ensure the development of functional memory CD4+ T cells.
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Affiliation(s)
- Roberto Tinoco
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037
| | - Florent Carrette
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037
| | - Monique L Henriquez
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037
| | - Yu Fujita
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037
| | - Linda M Bradley
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037
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Ferreira IG, Pucci M, Venturi G, Malagolini N, Chiricolo M, Dall'Olio F. Glycosylation as a Main Regulator of Growth and Death Factor Receptors Signaling. Int J Mol Sci 2018; 19:ijms19020580. [PMID: 29462882 PMCID: PMC5855802 DOI: 10.3390/ijms19020580] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 02/12/2018] [Accepted: 02/14/2018] [Indexed: 12/22/2022] Open
Abstract
Glycosylation is a very frequent and functionally important post-translational protein modification that undergoes profound changes in cancer. Growth and death factor receptors and plasma membrane glycoproteins, which upon activation by extracellular ligands trigger a signal transduction cascade, are targets of several molecular anti-cancer drugs. In this review, we provide a thorough picture of the mechanisms bywhich glycosylation affects the activity of growth and death factor receptors in normal and pathological conditions. Glycosylation affects receptor activity through three non-mutually exclusive basic mechanisms: (1) by directly regulating intracellular transport, ligand binding, oligomerization and signaling of receptors; (2) through the binding of receptor carbohydrate structures to galectins, forming a lattice thatregulates receptor turnover on the plasma membrane; and (3) by receptor interaction with gangliosides inside membrane microdomains. Some carbohydrate chains, for example core fucose and β1,6-branching, exert a stimulatory effect on all receptors, while other structures exert opposite effects on different receptors or in different cellular contexts. In light of the crucial role played by glycosylation in the regulation of receptor activity, the development of next-generation drugs targeting glyco-epitopes of growth factor receptors should be considered a therapeutically interesting goal.
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Affiliation(s)
- Inês Gomes Ferreira
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), General Pathology Building, University of Bologna, 40126 Bologna, Italy.
| | - Michela Pucci
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), General Pathology Building, University of Bologna, 40126 Bologna, Italy.
| | - Giulia Venturi
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), General Pathology Building, University of Bologna, 40126 Bologna, Italy.
| | - Nadia Malagolini
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), General Pathology Building, University of Bologna, 40126 Bologna, Italy.
| | - Mariella Chiricolo
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), General Pathology Building, University of Bologna, 40126 Bologna, Italy.
| | - Fabio Dall'Olio
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), General Pathology Building, University of Bologna, 40126 Bologna, Italy.
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Liang JX, Gao W, Cai L. Fucosyltransferase VII promotes proliferation via the EGFR/AKT/mTOR pathway in A549 cells. Onco Targets Ther 2017; 10:3971-3978. [PMID: 28860805 PMCID: PMC5558582 DOI: 10.2147/ott.s140940] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Fucosyltransferase VII (FUT7) is one of a1,3-fucosyltransferases family that catalyzes the final fucosylation step in the synthesis of Lewis antigens and generates a unique glycosylated product sialyl Lewis X (sLeX). sLeX can serve as ligands for E- or P-selectin expressed on the cell surface and results in cancer metastasis and angiogenesis. However, the molecular biological mechanisms of FUT7 elevation in neoplastic cells are still largely unknown. In this study, we examined the impact of FUT7 on cell proliferation and migration in A549 cells by colony formation assay, cell cycle assay, gelatin zymography, wound-healing assay, transwell invasion assay and Western blot. In addition, we identified that FUT7 activated EGFR/AKT/mTOR signal pathway that correlated with sLeX augmentation. In conclusion, FUT7 overexpression augments sLeX synthesis to trigger cell proliferation via the activation of EGFR/AKT/mTOR signaling pathway, which indicated that FUT7 may be a potential therapeutic target for epithelial cancers with a high expression of FUT7 and sLeX.
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Affiliation(s)
- Jin-Xiao Liang
- Department of Thoracic Surgery, Zhejiang Cancer Hospital
| | - Wei Gao
- School of Medicine, Zhejiang University City College, Hangzhou, People's Republic of China
| | - Lei Cai
- Department of Thoracic Surgery, Zhejiang Cancer Hospital
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Li FF, Liu JJ, Liu DW, Lin B, Hao YY, Cong JP, Zhu LC, Gao S, Zhang SL, Iwamori M. Lewis Y regulates signaling molecules of the transforming growth factor β pathway in ovarian carcinoma-derived RMG-I cells. Int J Oncol 2011; 40:1196-202. [PMID: 22179544 PMCID: PMC3584585 DOI: 10.3892/ijo.2011.1296] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 11/19/2011] [Indexed: 12/18/2022] Open
Abstract
LeY (Lewis Y) is a difucosylated oligosaccharide carried by glycoconjugates on the cell surface. Elevation of LeY is frequently observed in epithelial-derived cancers and is correlated to pathological staging and prognosis. To study the role of LeY on cancer cells, a stably LeY-overexpressing cell line, RMG-I-H, was developed previously by transfection of the α1,2-fucosyltransferase gene, a key enzyme that catalyzes the synthesis of LeY, into ovarian carcinoma-derived RMG-I cells. Our studies have shown that LeY is involved in the changes in biological behavior of RMG-I-H cells. However, the mechanism is still largely unknown. In this study, we determined the structural relationship and co-localization between LeY and TβRI/TβRII, respectively, and the potential cellular signaling mechanism was also investigated. We found that both TβRI and TβRII contain the LeY structure, and the level of LeY in TβRI and TβRII in RMG-I-H cells was significantly increased. Overexpression of LeY up-regulates the phosphorylation of ERK, Akt and down-regulates the phosphorylation of Smad2/3. In addition, the phosphorylation intensity was attenuated significantly by LeY monoantibody. These findings suggest that LeY is involved in the changes in biological behavior through TGF-β receptors via Smad, ERK/MAPK and PI3K/Akt signaling pathways. We suggest that LeY may be an important composition of growth factor receptors and could be an attractive candidate for cancer diagnosis and treatment.
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Affiliation(s)
- Fei-Fei Li
- Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang 110004, PR China
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Liu D, Liu J, Wang C, Lin B, Liu Q, Hao Y, Zhang S, Iwamori M. The stimulation of IGF-1R expression by Lewis(y) antigen provides a powerful development mechanism of epithelial ovarian carcinoma. Int J Mol Sci 2011; 12:6781-95. [PMID: 22072919 PMCID: PMC3211010 DOI: 10.3390/ijms12106781] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 09/26/2011] [Accepted: 09/30/2011] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE This study aimed to measure and correlate the expression of insulin-like growth factor receptor-1 (IGF-1R) and the Lewis(y) antigen in ovarian cancer cell lines and tissue samples. METHODS Reverse transcriptase PCR (RT-PCR), Western blotting, immunoprecipitation, immunohistochemistry, and immunofluorescence double-labeling techniques were applied to detect and measure the expression of Lewis(y) and IGF-1R. RESULTS In α1,2-fucosyltransferase (α1,2-FT)-transfected cells, IGF-1R expression was significantly upregulated compared with cells that do not overexpress α1,2-FT (P < 0.05). The amount of Lewis(y) expressed on IGF-1R increased 1.81-fold in α1,2-FT-overexpressing cells (P < 0.05), but the ratio of Lewis(y) expressed on IGF-1R to total IGF-1R was unaltered between two cells (P > 0.05). In malignant epithelial ovarian tumors, the positivity rates of Lewis(y) and IGF-1R detection were 88.3% and 93.33%, respectively, which is higher than the positivity rates in marginal (60.00% and 63.33%, all P < 0.05), benign (33.00% and 53.33%, all P < 0.01), and normal (0% and 40%, all P < 0.01) ovarian samples. No correlations were detected in positivity rates of Lewis(y) or IGF-1R expression with respect to clinicopathological parameters in ovarian cancers (all P > 0.05). Both IGF-1R and Lewis(y) were highly expressed in ovarian cancer tissues, and their expression levels were positively correlated (P < 0.05). CONCLUSION Overexpression of Lewis(y) results in overexpression of IGF-1R. Both IGF-1R and Lewis(y) are associated with the occurrence and development of ovarian cancers.
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Affiliation(s)
- Dawo Liu
- Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110004, China; E-Mails: (D.L.); (J.L.); (Q.L.); (Y.H.); (S.Z.)
| | - Juanjuan Liu
- Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110004, China; E-Mails: (D.L.); (J.L.); (Q.L.); (Y.H.); (S.Z.)
| | - Changzhi Wang
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Dalian Medical University, Dalian 116027, China; E-Mail:
| | - Bei Lin
- Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110004, China; E-Mails: (D.L.); (J.L.); (Q.L.); (Y.H.); (S.Z.)
| | - Qing Liu
- Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110004, China; E-Mails: (D.L.); (J.L.); (Q.L.); (Y.H.); (S.Z.)
| | - Yingying Hao
- Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110004, China; E-Mails: (D.L.); (J.L.); (Q.L.); (Y.H.); (S.Z.)
| | - Shulan Zhang
- Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110004, China; E-Mails: (D.L.); (J.L.); (Q.L.); (Y.H.); (S.Z.)
| | - Masao Iwamori
- Department of Biochemistry, Faculty of Science and Technology, Kinki University, 3-4-1 Kowakae, Higashiosaka, Osaka 577-8502, Japan; E-Mail:
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Lewis Glyco-Epitopes: Structure, Biosynthesis, and Functions. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2011; 705:53-80. [DOI: 10.1007/978-1-4419-7877-6_4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Casu A, Echeverri GJ, Bottino R, van der Windt DJ, He J, Ekser B, Ball S, Ayares D, Cooper DKC. Insulin secretion and glucose metabolism in alpha 1,3-galactosyltransferase knock-out pigs compared to wild-type pigs. Xenotransplantation 2010; 17:131-9. [PMID: 20522245 DOI: 10.1111/j.1399-3089.2010.00572.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Xenotransplantation of porcine islets could be a valuable alternative to the shortage of human islets for transplantation. To overcome the immunological obstacle of antibody-mediated rejection, pigs homozygous for alpha1,3-galactosyltransferase gene knock-out (GT-KO) have been produced. The effect of this mutation on glucose metabolism is unknown. METHODS Glucose, insulin, C-peptide and glucagon levels were studied in eight adult pigs (four wild-type [WT] and four GT-KO) during intravenous glucose tolerance test (IVGTT), arginine stimulation test (AST), and insulin tolerance test (ITT). Morphological analysis of the pancreata was also performed. The in vitro insulin response to a high glucose concentration and theophylline were studied in a dynamic perfusion system with isolated islets. RESULTS Basal and stimulated blood glucose levels were similar in WT and GT-KO pigs. Basal insulin, C-peptide and glucagon were higher in GT-KO pigs. C-peptide and insulin responses to arginine and glucose were also higher in GT-KO animals. The reduction in blood glucose during ITT and IVGTT was similar in WT and GT-KO pigs. The extent of staining for insulin and glucagon in the pancreata were similar. The basal insulin secretion of isolated islets was higher in GT-KO pigs, while stimulation indexes for glucose and theophylline were similar to WT. CONCLUSIONS GT-KO pigs demonstrated differences in glucose metabolism compared to WT pigs, the cause for which remains uncertain. It is unlikely that these differences would in any way affect the outcome of GT-KO porcine islet xenotransplantation.
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Affiliation(s)
- Anna Casu
- Division of Immunogenetics, Department of Pediatrics, Children's Hospital of Pittsburgh, Pittsburgh, PA, USA.
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Allahverdian S, Wang A, Singhera GK, Wong BW, Dorscheid DR. Sialyl Lewis X modification of the epidermal growth factor receptor regulates receptor function during airway epithelial wound repair. Clin Exp Allergy 2010; 40:607-18. [PMID: 20447077 DOI: 10.1111/j.1365-2222.2010.03455.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Epidermal growth factor receptor (EGFR) is a major regulator of airway epithelial cell (AEC) functions such as migration, proliferation and differentiation, which play an essential role in epithelial repair. EGFR is a glycoprotein with 12 potential N-glycosylation sites in its extracellular domain. Glycosylation of EGFR has been shown to modulate its function. Previously, our laboratory demonstrated an important role of the carbohydrate structure sialyl Lewis x (sLe(x)) in airway epithelial repair. OBJECTIVE To examine whether an sLe(x) decoration of EGFR can modulate receptor function during AEC repair. METHODS Primary normal human bronchial epithelial (NHBE) cells were cultured in vitro. Co-localization of sLe(x) and EGFR was examined using confocal microscopy. Expressions of RNA and protein were analysed using RT-PCR and Western blotting. The final step in the synthesis of sLe(x) was catalysed by a specific alpha-1,3-fucosyltransferase (FucT-IV). To evaluate the role of sLe(x) in EGFR activation, a knockdown of the FucT-IV gene with small interfering RNA (siRNA) and an inhibitory anti-sLe(x) antibody (KM-93) was used. RESULTS We demonstrated a co-localization of sLe(x) with EGFR on NHBE cells using confocal microscopy. Using a blocking antibody for sLe(x) after a mechanical injury, we observed a reduction in EGFR phosphorylation and epithelial repair following injury. FucT-IV demonstrates a temporal expression coordinate with epithelial repair. Down-regulation of FucT-IV expression in NHBE by specific siRNA suppressed sLe(x) expression. The use of FucT-IV siRNA significantly reduced phosphorylation of EGFR and prevented epithelial repair. An immunohistochemical analysis of human normal and asthmatic airways showed a significant reduction in sLe(x) and tyrosine-phosphorylated EGFR (pY(845)-EGFR) in the epithelium of asthmatic subjects compared with that of normal subjects. CONCLUSION The present data demonstrate that sLe(x), in association with EGFR, in NHBE is coordinate with repair. This glycosylation is important in modulating EGFR activity to affect the repair of normal primary AEC.
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Affiliation(s)
- S Allahverdian
- Department of Medicine, UBC James Hogg Research Centre, Providence Heart+Lung Institute, St. Paul's Hospital, University of British Columbia, Vancouver, Canada
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Wang QY, Zhang Y, Shen ZH, Chen HL. alpha1,3 fucosyltransferase-VII up-regulates the mRNA of alpha5 integrin and its biological function. J Cell Biochem 2008; 104:2078-90. [PMID: 18452157 DOI: 10.1002/jcb.21763] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
After transfection of alpha1,3fucosyltransferase (FucT)-VII cDNA into H7721 human hepatocarcinoma cells, the expression of alpha5, but not beta1 integrin was significantly up-regulated. This was evidenced by the increase of alpha5 integrin on cell surface as well as the increase of alpha5 mRNA and protein in the cells. However, the expressions of sialyl Lewis X (SLe(x), the product of alpha1,3FucT-VII) on both alpha5 and beta1 integrin subunits were unchanged. Concomitantly, the tyrosine autophosphorylated FAK and dephosphorylated Src (FAK and Src involve in the signal transduction of integrin alpha5beta1) were up-regulated, while the Tyr-527 phosphorylated Src was down-regulated. The above-mentioned alterations were correlated to the expressions of alpha1,3FucT-VII in different alpha1,3FucT-VII transfected H7721 cell lines. In addition, after alpha1,3FucT-VII transfection, cell adhesion to fibronectin (Fn) and chemotaxic cell migration were obviously promoted. The cell adhesion could be blocked by alpha5 integrin antibody, and cell migration was obviously attenuated by the antibodies to both alpha5 integrin and SLe(x). These findings suggest that the increased surface alpha5 integrin caused by the up-regulation of alpha5 mRNA promotes the cell adhesion to Fn, cell migratiom, and Fn-induced signaling of alpha5beta1 integrin. The up-regulation of surface SLe(x) originated from the over expression of alpha1,3FucT-VII also led to the stimulation of cell migration. This is the first time to report that alpha1,3FucT-VII can regulate the mRNA expression of integrin.
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Affiliation(s)
- Qiu-Yan Wang
- Key Laboratory of Glycoconjugate Research, Ministry of Health, Department of Biochemistry, Shanghai Medical college, Fudan University, Shanghai 200032, China
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