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Kerstholt M, van de Schoor FR, Oosting M, Moorlag SJCFM, Li Y, Jaeger M, van der Heijden WA, Tunjungputri RN, dos Santos JC, Kischkel B, Vrijmoeth HD, Baarsma ME, Kullberg BJ, Lupse M, Hovius JW, van den Wijngaard CC, Netea MG, de Mast Q, Joosten LAB. Identifying platelet-derived factors as amplifiers of B. burgdorferi-induced cytokine production. Clin Exp Immunol 2022; 210:53-67. [PMID: 36001729 PMCID: PMC9585555 DOI: 10.1093/cei/uxac073] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 07/07/2022] [Accepted: 08/11/2022] [Indexed: 01/25/2023] Open
Abstract
Previous studies have shown that monocytes can be 'trained' or tolerized by certain stimuli to respond stronger or weaker to a secondary stimulation. Rewiring of glucose metabolism was found to be important in inducing this phenotype. As we previously found that Borrelia burgdorferi (B. burgdorferi), the causative agent of Lyme borreliosis (LB), alters glucose metabolism in monocytes, we hypothesized that this may also induce long-term changes in innate immune responses. We found that exposure to B. burgdorferi decreased cytokine production in response to the TLR4-ligand lipopolysaccharide (LPS). In addition, B. burgdorferi exposure decreased baseline levels of glycolysis, as assessed by lactate production. Using GWAS analysis, we identified a gene, microfibril-associated protein 3-like (MFAP3L) as a factor influencing lactate production after B. burgdorferi exposure. Validation experiments proved that MFAP3L affects lactate- and cytokine production following B. burgdorferi stimulation. This is mediated by functions of MFAP3L, which includes activating ERK2 and through activation of platelet degranulation. Moreover, we showed that platelets and platelet-derived factors play important roles in B. burgdorferi-induced cytokine production. Certain platelet-derived factors, such chemokine C-X-C motif ligand 7 (CXCL7) and (C-C motif) ligand 5 (CCL5), were elevated in the circulation of LB patients in comparison to healthy individuals.
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Affiliation(s)
| | | | - Marije Oosting
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Simone J C F M Moorlag
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Yang Li
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands,Department of Computational Biology for Individualised Medicine, Centre for Individualised Infection Medicine (CiiM) and TWINCORE, Joint Ventures Between the Helmholtz-Centre for Infection Research (HZI) and the Hannover Medical School (MHH), Hannover, Germany
| | - Martin Jaeger
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Wouter A van der Heijden
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Rahajeng N Tunjungputri
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands,Center for Tropical and Infectious Diseases (CENTRID), Faculty of Medicine Diponegoro University, Dr. Kariadi Hospital, Semarang, Indonesia
| | - Jéssica C dos Santos
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Brenda Kischkel
- Department of Internal Medicine and Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Hedwig D Vrijmoeth
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - M E Baarsma
- Amsterdam Institute of Infection and Immunology, Center for Experimental and Molecular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Bart-Jan Kullberg
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Mihaela Lupse
- Department of Infectious Diseases, University of Medicine and Pharmacy ‘Iuliu Hatieganu’, Cluj-Napoca, Romania
| | - Joppe W Hovius
- Amsterdam Institute of Infection and Immunology, Center for Experimental and Molecular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Cees C van den Wijngaard
- National Institute for Public Health and the Environment (RIVM), Center of Infectious Disease Control, Bilthoven, The Netherlands
| | - Mihai G Netea
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands,Department for Immunology and Metabolism, Life and Medical Sciences Institute (LIMES), University of Bonn, Germany
| | - Quirijn de Mast
- Department of Internal Medicine and Radboudumc Center for Infectious diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands
| | - Leo A B Joosten
- Correspondence: Leo A.B. Joosten, Lab Experimentele geneeskunde, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA, Nijmegen, The Netherlands. E-mail:
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Wu Q, Tu H, Li J. Multifaceted Roles of Chemokine C-X-C Motif Ligand 7 in Inflammatory Diseases and Cancer. Front Pharmacol 2022; 13:914730. [PMID: 35837284 PMCID: PMC9273993 DOI: 10.3389/fphar.2022.914730] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 06/07/2022] [Indexed: 11/13/2022] Open
Abstract
Over recent years, C-X-C motif ligand 7 (CXCL7) has received widespread attention as a chemokine involved in inflammatory responses. Abnormal production of the chemokine CXCL7 has been identified in different inflammatory diseases; nevertheless, the exact role of CXCL7 in the pathogenesis of inflammatory diseases is not fully understood. Persistent infection or chronic inflammation can induce tumorigenesis and progression. Previous studies have shown that the pro-inflammatory chemokine CXCL7 is also expressed by malignant tumor cells and that binding of CXCL7 to its cognate receptors C-X-C chemokine receptor 1 (CXCR1) and C-X-C chemokine receptor 2 (CXCR2) can influence tumor biological behavior (proliferation, invasion, metastasis, and tumor angiogenesis) in an autocrine and paracrine manner. CXCL7 and its receptor CXCR1/CXCR2, which are aberrantly expressed in tumors, may represent new targets for clinical tumor immunotherapy.
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Affiliation(s)
- Qianmiao Wu
- Department of Hematology, Second Affiliated Hospital of Nanchang University, Nanchang, China.,Department of Medicine, Nanchang University, Nanchang, China
| | - Huaijun Tu
- Department of Neurology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Jian Li
- Department of Hematology, Second Affiliated Hospital of Nanchang University, Nanchang, China
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3
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Caligiuri A, Pastore M, Lori G, Raggi C, Di Maira G, Marra F, Gentilini A. Role of Chemokines in the Biology of Cholangiocarcinoma. Cancers (Basel) 2020; 12:cancers12082215. [PMID: 32784743 PMCID: PMC7463556 DOI: 10.3390/cancers12082215] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/03/2020] [Accepted: 08/05/2020] [Indexed: 02/07/2023] Open
Abstract
Cholangiocarcinoma (CCA), a heterogeneous tumor with poor prognosis, can arise at any level in the biliary tree. It may derive from epithelial cells in the biliary tracts and peribiliary glands and possibly from progenitor cells or even hepatocytes. Several risk factors are responsible for CCA onset, however an inflammatory milieu nearby the biliary tree represents the most common condition favoring CCA development. Chemokines play a key role in driving the immunological response upon liver injury and may sustain tumor initiation and development. Chemokine receptor-dependent pathways influence the interplay among various cellular components, resulting in remodeling of the hepatic microenvironment towards a pro-inflammatory, pro-fibrogenic, pro-angiogenic and pre-neoplastic setting. Moreover, once tumor develops, chemokine signaling may influence its progression. Here we review the role of chemokines in the regulation of CCA development and progression, and the modulation of angiogenesis, metastasis and immune control. The potential role of chemokines and their receptors as possible biomarkers and/or therapeutic targets for hepatobiliary cancer is also discussed.
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Affiliation(s)
| | | | | | | | | | - Fabio Marra
- Correspondence: (F.M.); (A.G.); Tel.: +39-055-2758095 or +39-055-2758498 or +39-055-2758499 (F.M.); +39-055-2751801 (A.G.)
| | - Alessandra Gentilini
- Correspondence: (F.M.); (A.G.); Tel.: +39-055-2758095 or +39-055-2758498 or +39-055-2758499 (F.M.); +39-055-2751801 (A.G.)
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Guo Q, Jian Z, Jia B, Chang L. CXCL7 promotes proliferation and invasion of cholangiocarcinoma cells. Oncol Rep 2016; 37:1114-1122. [PMID: 27959418 DOI: 10.3892/or.2016.5312] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Accepted: 11/08/2016] [Indexed: 11/06/2022] Open
Abstract
CXCL7 is an important chemoattractant cytokine, which signals through binding to its receptor CXCR2. Recent studies have demonstrated that the CXCL7/CXCR2 signaling plays a promoting role in several common malignancies, including lung, renal, colon, and breast cancer. However, the regulatory role of CXCL7, in cholangiocarcinoma, as well as the underlying mechanism, has not been previously reported. Herein, we found more positive expression of CXCL7 in cholangiocarcinoma tissues compared to adjacent non-tumor tissues. High CXCL7 expression was significantly correlated with poor differentiation, lymph node metastasis, vascular invasion and advanced clinical stage, but was not associated with age, gender, or tumor size. Besides, the expression of CXCL7 was significantly associated with the Ki67 expression, but not associated with CA199, AFP, or P53 expression in cholangiocarcinoma. Moreover, the overall survival of cholangiocarcinoma patients with high CXCL7 expression was significantly shorter than those with low CXCL7 expression. In vitro study indicated that CXCL7 and CXCR2 were also positively expressed in several common cholangiocarcinoma cell lines, including HuCCT1, HuH28, QBC939, EGI-1, OZ and WITT. SiRNA-induced inhibition of CXCL7 significantly reduced the proliferation and invasion of QBC939 cells. On the contrary, overexpression of CXCL7 markedly promoted these malignant phenotypes of QBC939 cells. Of note, the conditioned medium of CXCL7-overexpresing human hepatic stellate cells could also promote the proliferation and invasion of QBC939 cells, suggesting that CXCL7 may also play an oncogenic role in cholangiocarcinoma in a paracrine-dependent manner, not only in an autocrine-dependent manner. Molecular assay data suggested that the AKT signaling pathway was involved in the CXCL7-mediated malignant phenotypes of QBC939 cells. In summary, our study suggests that CXCL7 plays a promoting role in regulating the growth and metastasis of cholangiocarcinoma.
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Affiliation(s)
- Qian Guo
- Graduate College, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Zhixiang Jian
- Graduate College, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Baoqing Jia
- Department of Breast Neoplasms Surgery, People's Hospital of Inner Mongolia, Hohhot, Inner Mongolia 010017, P.R. China
| | - Liang Chang
- Department of Oncology Surgery, Inner Mongolia Baogang Hospital, Baotou, Inner Mongolia 404010, P.R. China
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5
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Absorption, distribution and mechanism of action of SYSADOAS. Pharmacol Ther 2014; 142:362-74. [DOI: 10.1016/j.pharmthera.2014.01.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 01/08/2014] [Indexed: 02/07/2023]
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Role of platelet chemokines, PF-4 and CTAP-III, in cancer biology. J Hematol Oncol 2013; 6:42. [PMID: 23800319 PMCID: PMC3694472 DOI: 10.1186/1756-8722-6-42] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 06/13/2013] [Indexed: 12/31/2022] Open
Abstract
With the recent addition of anti-angiogenic agents to cancer treatment, the angiogenesis regulators in platelets are gaining importance. Platelet factor 4 (PF-4/CXCL4) and Connective tissue activating peptide III (CTAP-III) are two platelet-associated chemokines that modulate tumor angiogenesis, inflammation within the tumor microenvironment, and in turn tumor growth. Here, we review the role of PF-4 and CTAP-III in the regulation of tumor angiogenesis; the results of clinical trial using recombinant PF-4 (rPF-4); and the use of PF-4 and CTAP-III as cancer biomarkers.
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Phillips T, Ferraz I, Bell S, Clegg PD, Carter SD, Mobasheri A. Differential regulation of the GLUT1 and GLUT3 glucose transporters by growth factors and pro-inflammatory cytokines in equine articular chondrocytes. Vet J 2005; 169:216-22. [PMID: 15727913 DOI: 10.1016/j.tvjl.2004.01.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/16/2004] [Indexed: 11/23/2022]
Abstract
Glucose serves as the major energy substrate for articular chondrocytes and as the main precursor for the synthesis of extracellular matrix glycosaminoglycans in cartilage. Chondrocytes have been shown to express several glucose transporter (GLUT) isoforms including GLUT1 and GLUT3. The aim of this investigation was to determine the effects of endocrine and cytokine factors on the capacity of equine articular chondrocytes for transporting 2-deoxy-d-[2,6-3H] glucose and on the expression levels of GLUT1 and GLUT3. Chondrocytes maintained in monolayer culture were stimulated for 24 h with TNF-alpha (100 ng mL(-1)), IL-1beta (100 ng mL(-1)), IGF-I (20 ng mL(-1)), TGF-beta (20 ng mL(-1)) and insulin (12.5 microg mL(-1)) before measuring uptake of non-metabolizable 2-deoxyglucose in the presence and absence of the glucose transport inhibitor cytochalasin B. Polyclonal antibodies to GLUT1 and GLUT were used to compare GLUT1 and GLUT3 expression in stimulated and un-stimulated alginate encapsulated chondrocytes by Western blotting. Results indicated that 2-deoxyglucose uptake was inhibited by up to 95% in the presence of cytochalasin B suggesting that glucose uptake into equine chondrocytes is GLUT-mediated. Insulin had no effect on glucose uptake, but treatment with IGF-I, TGF-beta, IL-1beta and TNF-alpha resulted in a significant increase (>65%) in 2-deoxyglucose uptake compared to control values. GLUT1 was found to be increased in chondrocytes stimulated with all the growth factors and cytokines but GLUT 3 was only upregulated by IGF-I. The data presented support a critical role for glucose in the responses of equine articular chondrocytes to pro-inflammatory cytokines and anabolic endocrine factors.
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Affiliation(s)
- Toby Phillips
- Connective Tissue and Molecular Pathogenesis Research Groups, Faculty of Veterinary Science, University of Liverpool, Liverpool L69 7ZJ, UK
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Richardson S, Neama G, Phillips T, Bell S, Carter SD, Moley KH, Moley JF, Vannucci SJ, Mobasheri A. Molecular characterization and partial cDNA cloning of facilitative glucose transporters expressed in human articular chondrocytes; stimulation of 2-deoxyglucose uptake by IGF-I and elevated MMP-2 secretion by glucose deprivation. Osteoarthritis Cartilage 2003; 11:92-101. [PMID: 12554125 DOI: 10.1053/joca.2002.0858] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Recent evidence suggests that human chondrocytes express several facilitative glucose transporter (GLUT) isoforms and also that 2-deoxyglucose transport is accelerated by cytokine stimulation. The aim of the present investigation was to determine if human articular chondrocytes express any of the recently identified members of the GLUT/SLC2A gene family and to examine the effects of endocrine factors, such as insulin and IGF-I on the capacity of human chondrocytes for transporting 2-deoxyglucose. DESIGN/METHODS PCR, cloning and immunohistochemistry were employed to study the expression of GLUT/SLC2A transporters in normal human articular cartilage. The uptake of 2-deoxyglucose was examined in monolayer cultured immortalized human chondrocytes following stimulation with TNF-alpha, insulin and IGF-I. Levels of MMP-2 were assessed by gelatin zymography following glucose deprivation of alginate cultures. RESULTS Using PCR we detected transcripts for eight glucose transporter isoforms (GLUTs 1, 3, 6, 8, 9, 10, 11 and 12) and for a fructose transporter (GLUT5) in human articular cartilage. Expression of GLUT1, GLUT3 and GLUT9 proteins in normal human articular cartilage was confirmed by immunohistochemistry. The uptake of 2-deoxyglucose was dependent on time and temperature, inhibited by cytochalasin B and phloretin, and significantly accelerated in chondrocyte cultures stimulated with IGF-I. However, 2-deoxyglucose uptake was unaffected by short and long-term insulin treatment, which ruled out a functional role for insulin-sensitive GLUT4-mediated glucose transport. Furthermore, secretion of MMP-2 was increased in alginate cultures deprived of glucose. CONCLUSIONS The data supports a critical role for glucose transport and metabolism in the synthesis and degradation of cartilage.
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Affiliation(s)
- S Richardson
- Connective Tissue Research Group, Department of Veterinary Preclinical Sciences, Faculty of Veterinary Science, University of Liverpool, UK
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Park C, Kim JR, Shim JK, Kang BS, Park YG, Nam KS, Lee YC, Kim CH. Inhibitory effects of streptozotocin, tumor necrosis factor-alpha, and interleukin-1beta on glucokinase activity in pancreatic islets and gene expression of GLUT2 and glucokinase. Arch Biochem Biophys 1999; 362:217-24. [PMID: 9989930 DOI: 10.1006/abbi.1998.1004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Treatment of streptozotocin (ST), tumor necrosis factor-alpha (TNF-alpha), and interleukin-1beta (IL-1beta) resulted in destroying insulin-secreting beta-cells of pancreatic islets and impairment of islet glucose oxidation and glucose-induced insulin secretion. IL-1beta and TNF-alpha inhibited insulin release and glucose utilization and oxidation. It was shown that the inhibitory effects of ST, IL-1beta, and TNF-alpha were due to impaired glucokinase activity. Glucokinase activity was severely impaired by ST, IL-1beta, and TNF-alpha treatments, as confirmed by assaying enzymes and nucleotides associated with glycolysis and glucose oxidation. On the other hand, nitric oxide was a factor of the deleterious effects of IL-1beta, TNF-alpha, and ST on pancreatic islets. Incubation of mouse pancreatic islets with ST at various concentrations of impairing insulin secretion resulted in generation of nitrite, stimulation of islet guanylyl cyclase and accumulation of cGMP, and inhibition of pancreatic islet mitochondrial aconitase activity to degree similar to those raised by IL-1beta and TNF-alpha. When the effects of IL-1beta and TNF-alpha on the gene expression of pancreatic GLUT2 and glucokinase were examined, the level of GLUT2 and glucokinase mRNA in pancreatic islets was significantly decreased. This suggested that IL-1beta and TNF-alpha downregulate gene expression of GLUT2 and glucokinase in pancreatic beta-cells.
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Affiliation(s)
- C Park
- College of Oriental Medicine, College of Medicine, DongGuk University, Sukjang-Dong 707, Kyung-Ju City, Kyungpook, 780-714, Korea
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Reisser C, Eichhorn K, Herold-Mende C, Born AI, Bannasch P. Expression of facilitative glucose transport proteins during development of squamous cell carcinomas of the head and neck. Int J Cancer 1999; 80:194-8. [PMID: 9935199 DOI: 10.1002/(sici)1097-0215(19990118)80:2<194::aid-ijc6>3.0.co;2-m] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Positron emission tomography studies on malignant head and neck tumors have shown that tumor growth and elevated glucose uptake are associated. On a molecular level, glucose uptake is mediated by specific glucose transport proteins, which exhibit an altered expression in head and neck malignant neoplasms. However, it is unknown when during development of squamous cell carcinomas an alteration of the expression of glucose transport proteins occurs. We have studied the expression of different facilitating glucose transport proteins (GLUT 1, 2, 3 and 4) by immunohistochemistry in a variety of preneoplastic and neoplastic mucosal lesions of the head and neck. We have observed weak expression of GLUT 1 in normal mucosa, a marked expression of GLUT 1 throughout preneoplastic lesions, which correlated well with the degree of dysplasia. In squamous cell carcinomas of the head and neck (HNSCC) and metastases, GLUT 1 was always expressed strongly. In contrast, GLUT 2, 3 and 4 were not detected in any of the epithelial tissues examined. The increased expression of GLUT 1 in dysplastic lesions and its sustained expression in SCC indicate that changes of GLUT 1 expression are early events during development of HNSCC. Therefore, the detection of GLUT 1 might be a reliable marker in the diagnosis of premalignant lesions of the oropharyngeal mucosa.
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Affiliation(s)
- C Reisser
- Department of Otolaryngology, Head and Neck Surgery, University of Heidelberg, Germany.
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Yang Y, Mayo K, Daly T, Barry J, La Rosa G. Subunit association and structural analysis of platelet basic protein and related proteins investigated by 1H NMR spectroscopy and circular dichroism. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32134-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Merrall NW, Plevin R, Gould GW. Growth factors, mitogens, oncogenes and the regulation of glucose transport. Cell Signal 1993; 5:667-75. [PMID: 8130071 DOI: 10.1016/0898-6568(93)90028-k] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The erythrocyte (or HepG2/brain) type glucose transporter (GLUT 1) was the first of the family of facilitative glucose transporter proteins to be cloned [M. Mueckler et al., Science 229, 941-945, 1985]. GLUT 1 is expressed in most tissue types, all cell lines, transformed cells and tumour cells. It is thought to be responsible for "housekeeping" levels of glucose transport, i.e. the uptake of glucose required for oxidative phosphorylation. The rate of glucose transport via GLUT 1 can be regulated under conditions in which the metabolic rate must be adjusted such as cell division (mitosis and meiosis), differentiation, transformation and nutrient starvation. Here we review the recent literature on the control of glucose transport of mitogens, growth factors and oncogenes, and discuss some of the implications for the integration of cellular signalling pathways and cell growth.
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Affiliation(s)
- N W Merrall
- Department of Biochemistry, University of Glasgow, U.K
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