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Yang Y, Sun M, Yan S, Yao N, Li X, Wu C, Wu Z, Wang F, Cui W, Li B. LINC317.5 as a novel biomarker for hypertriglyceridemia in normal glucose metabolism. Cell Death Discov 2024; 10:194. [PMID: 38670967 PMCID: PMC11053116 DOI: 10.1038/s41420-024-01968-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 04/12/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
The global rise in prediabetes and diabetes, with type 2 diabetes (T2DM) being predominant, highlights the association between T2DM and hypertriglyceridemia (HTG). Patients with both abnormal glucose levels and HTG require increased attention due to higher risks of complications and mortality. Therefore, this study aimed to find the key long non-coding RNA (lncRNA) of HTG in the abnormal glucose metabolism patients. We collected blood samples for RNA sequencing experiments and blood samples for validation in population. We have conducted RNA sequencing, weighted gene co-expression network analysis (WGCNA), quantitative real-time polymerase chain reaction (qRT-PCR) in a 82-vs-82-sample-size population and insulin induced HepG2, RNA- Fluorescence in situ hybridization (FISH) and Cell Counting Kit-8 (CCK-8). We also explored lipid metabolism related transcription factor and the related protein expression and processed key lncRNA by both interference expression and overexpression, and the related consequences were rescued by its target mRNA. ENST00000540317.5 (LINC317.5) was lower in HTG with abnormal glucose metabolism and was found in both cytoplasm and nucleus in HepG2, inversely regulating the accumulation of TG and its target mRNA TKFC. Relative expression of peroxisome proliferator-activated receptor alpha (PPARα) and peroxisome proliferator-activated receptor gamma (PPARγ) were decreasing, and SREBP-1c (sterol regulatory element-binding protein-1c) was increasing of the interference expression of LINC317.5. Interference expression of LINC317.5 significantly decreased the protein expression of ACADM and CPT1A, whereas increased the protein expression of FAS and ACC1. TKFC partly reduced the triglyceride (TG) accumulation of LINC317.5. In conclusion, we suggested LINC317.5-TKFC as a key for TG accumulation in the HepG2-insulin resistant (IR). These might provide information of non-invasive biomarkers for the HTG with abnormal glucose.
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Affiliation(s)
- Yixue Yang
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China
| | - Mengzi Sun
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China
- The First Affiliated Hospital of Xi'an Jiaotong University, International Obesity and Metabolic Disease Research Center, Xi'an, 710061, P. R. China
- Global Health Institute, Xi'an Jiaotong University, Xi'an, 710115, P. R. China
| | - Shoumeng Yan
- School of Nursing, Jilin University, Changchun, 130021, P. R. China
| | - Nan Yao
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China
| | - Xiaotong Li
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China
| | - Caihong Wu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, P. R. China
| | - Zibo Wu
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China
| | - Fengdan Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China
| | - Weiwei Cui
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, P. R. China.
| | - Bo Li
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, P. R. China.
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Li LJ, Li GD, Wei HL, Chen J, Liu YM, Li F, Xie B, Wang B, Li CL. Insulin resistance reduces sensitivity to Cis-platinum and promotes adhesion, migration and invasion in HepG2 cells. Asian Pac J Cancer Prev 2015; 15:3123-8. [PMID: 24815457 DOI: 10.7314/apjcp.2014.15.7.3123] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The liver is normally the major site of glucose metabolism in intact organisms and the most important target organ for the action of insulin. It has been widely accepted that insulin resistance (IR) is closely associated with postoperative recurrence of hepatocellular carcinoma (HCC). However, the relationship between IR and drug resistance in liver cancer cells is unclear. In the present study, IR was induced in HepG2 cells via incubation with a high concentration of insulin. Once the insulin-resistant cell line was established, the instability of HepG2/ IR cells was further tested via incubation in insulin-free medium for another 72h. Afterwards, the biological effects of insulin resistance on adhesion, migration, invasion and sensitivity to cis-platinum (DDP) of cells were determined. The results indicated that glucose consumption was reduced in insulin-resistant cells. In addition, the expression of the insulin receptor and glucose transportor-2 was downregulated. Furthermore, HepG2/IR cells displayed markedly enhanced adhesion, migration, and invasion. Most importantly, these cells exhibited a lower sensitivity to DDP. By contrast, HepG2/IR cells exhibited decreased adhesion and invasion after treatment with the insulin sensitizer pioglitazone hydrochloride. The results suggest that IR is closely related to drug resistance as well as adhesion, migration, and invasion in HepG2 cells. These findings may help explain the clinical observation of limited efficacy for chemotherapy on a background of IR, which promotes the invasion and migration of cancer cells.
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Affiliation(s)
- Lin-Jing Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China E-mail :
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STAGSTED JAN. Journey beyond immunology. Regulation of receptor internalization by major histocompatibility complex class I (MHC-I) and effect of peptides derived from MHC-I. APMIS 2011. [DOI: 10.1111/j.1600-0463.1998.tb05657.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Ramalingam TS, Chakrabarti A, Edidin M. Interaction of class I human leukocyte antigen (HLA-I) molecules with insulin receptors and its effect on the insulin-signaling cascade. Mol Biol Cell 1997; 8:2463-74. [PMID: 9398668 PMCID: PMC25720 DOI: 10.1091/mbc.8.12.2463] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/1997] [Accepted: 09/22/1997] [Indexed: 02/05/2023] Open
Abstract
Insulin receptor (IR) and class I major histocompatibility complex molecules associate with one another in cell membranes, but the functional consequences of this association are not defined. We found that IR and human class I molecules (HLA-I) associate in liposome membranes and that the affinity of IR for insulin and its tyrosine kinase activity increase as the HLA:IR ratio increases over the range 1:1 to 20:1. The same relationship between HLA:IR and IR function was found in a series of B-LCL cell lines. The association of HLA-I and IR depends upon the presence of free HLA heavy chains. All of the effects noted were reduced or abrogated if liposomes or cells were incubated with excess HLA-I light chain, beta2-microglobulin. Increasing HLA:IR also enhanced phosphorylation of insulin receptor substrate-1 and the activation of phosphoinositide 3-kinase. HLA-I molecules themselves were phosphorylated on tyrosine and associated with phosphoinositide 3-kinase when B-LCL were stimulated with insulin.
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Affiliation(s)
- T S Ramalingam
- Department of Biology, The Johns Hopkins University, Baltimore, Maryland 21218, USA
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Olsson L, Goldstein A, Stagsted J. Regulation of receptor internalization by the major histocompatibility complex class I molecule. Proc Natl Acad Sci U S A 1994; 91:9086-90. [PMID: 8090774 PMCID: PMC44752 DOI: 10.1073/pnas.91.19.9086] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We showed previously that peptides derived from the alpha 1 domain of the major histocompatibility complex class I protein (MHC-I) inhibit internalization of some receptors, thereby increasing the steady-state number of active receptors on the cell surface. In consequence, sensitivity to hormone (e.g., insulin) is enhanced, transport (e.g., of glucose by GLUT-4) is increased, and carrier proteins (e.g., transferrin) operate less efficiently. Now we report that a bioactive peptide (but not closely related inactive ones) binds to MHC-I on the cell surface, not in the groove but apparently to the alpha 1 helix. The binding is saturable, and the number of peptide binding sites on the cell surface approximately equals the number of MHC-I molecules. Antibodies to MHC-I inhibit peptide binding. Most significant, antibodies to MHC-I mimic the effect of a bioactive peptide, inhibiting receptor internalization. These results indicate that MHC-I participates in the regulation of cell surface receptor activity.
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Affiliation(s)
- L Olsson
- Receptron, Inc., Concord, CA 94520
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Tsaltas G, Ford CH. Cell membrane antigen-antibody complex dissociation by the widely used glycine-HCL method: an unreliable procedure for studying antibody internalization. Immunol Invest 1993; 22:1-12. [PMID: 8440521 DOI: 10.3109/08820139309066189] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Methods following the process of binding and internalization of antibodies to cell surface antigens have often employed low pH isoosmolar buffers in order to dissociate surface antigen-antibody complexes. One of the most widely used buffers is a 0.05 M glycine-HCL buffer pH 2.8. Since the efficacy of action of this buffer was critical to a series of internalization experiments employing monoclonal antibodies (Mabs) to carcinoembryonic antigen (CEA) expressing cancer cell lines in this laboratory, we tested its performance in a number of different assays. Our results indicate that this buffer only partially dissociates antigen-antibody bonds and therefore can introduce major inaccuracies in internalization experiments.
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Affiliation(s)
- G Tsaltas
- Oncology Research, Memorial University, St. John's, Newfoundland, Canada
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Cremaschi G, Borda E, Sales M, Genaro A, Sterin-Borda L. Major histocompatibility complex modulation of beta-adrenoceptor function. Biochem Pharmacol 1990; 39:1861-8. [PMID: 2162169 DOI: 10.1016/0006-2952(90)90602-h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Reciprocal interaction between beta-adrenoceptor specific ligand occupancy and alloantibody binding to specific antigens of cardiac and smooth muscle tissues was observed. Interference of alloimmune antibody fixation to both cardiac and oviductal tract preparations by beta 1 or beta 2 selective blockers, respectively, was obtained by means of indirect immunofluorescence assays. Reciprocally, alloimmune IgG and monoclonal antibodies directed to class I H-2 antigens, behaving as beta-adrenoceptor agonists, modified the contractility of both tissues, increasing intracellular levels of cyclic AMP (cAMP). Additionally, alloantibodies were also capable of inhibiting specific beta-adrenoceptor radioligand binding to purified cardiac and smooth muscle membranes. These data suggested a modulation of beta-adrenoceptor function by antibodies directed against H-2 class I histocompatibility molecules, probably through molecular interactions between both structures.
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MESH Headings
- Animals
- Antibodies, Monoclonal/metabolism
- Butoxamine/pharmacology
- Cyclic AMP/biosynthesis
- Female
- Heart/drug effects
- Immunoglobulin Allotypes
- Immunoglobulin G/pharmacology
- Ligands
- Major Histocompatibility Complex/drug effects
- Major Histocompatibility Complex/immunology
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C3H
- Muscle, Smooth/drug effects
- Muscle, Smooth/metabolism
- Muscle, Smooth/pathology
- Myocardium/immunology
- Myocardium/metabolism
- Myocardium/pathology
- Practolol/pharmacology
- Propranolol/pharmacology
- Receptors, Adrenergic, beta/drug effects
- Receptors, Adrenergic, beta/immunology
- Receptors, Adrenergic, beta/metabolism
- Tritium/metabolism
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Affiliation(s)
- G Cremaschi
- Centro de Estudios Farmacológicos y de Principios Naturales, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, Buenos Aires
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Cremaschi G, Genaro AM, Sterin-Borda L. Colchicine blocks beta adrenoceptor and class I antigen-specific interactions. Mol Immunol 1989; 26:601-9. [PMID: 2550817 DOI: 10.1016/0161-5890(89)90042-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Previously we have demonstrated a molecular relationship between H-2 class I antigens and beta adrenoceptors from cardiac tissue. Here we show this type of interaction taking place with beta adrenoceptors from splenic cells and their purified membranes and the participation of cytoskeletal proteins in the phenomenon. Alloimmune, as well as anti-class I but not anti-class II, antibodies were able to inhibit in a competitive manner the binding of (-)-[3H]dihydroalprenolol to splenic lymphocytes and their purified membranes, and to increase cyclic AMP levels in intact cells as a consequence of beta adrenoceptor activation. Furthermore, colchicine (a microtubule disrupting drug), but not cytochalasin B (a microfilament disrupting drug), was able to abrogate alloimmune antibody inhibition over the beta radioligand binding to its receptor on both intact splenocytes and their membranes. Alloantibody actions were significantly diminished by peripheral protein solubilization in purified spleen cell membranes. These data pointed indirectly to the participation of a colchicine binding protein in class I antigen hormone-receptor associations.
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Affiliation(s)
- G Cremaschi
- Centro de Estudios Farmacológicos y de Principios Naturales, CONICET, Buenos Aires, Argentina
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Cremaschi GA, Sterin-Borda L. Stimulation of phosphoinositide hydrolysis via class I antigen-specific recognition in murine cardiac tissue. FEBS Lett 1989; 249:302-6. [PMID: 2544453 DOI: 10.1016/0014-5793(89)80646-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Induction of polyphosphoinositide hydrolysis in cardiac tissue by specific recognition of class I histocompatibility antigens was assayed. C3H (H-2k) mice auricles were labelled with myo-[3H]inositol precursor and inositol phosphate production in the presence or absence of anti-class I k products was measured. Anti-class I, but not anti-class II products specifically increased phosphoinositide turnover. This increment was partially blocked by muscarinic cholinergic and alpha-adrenergic blockers and even more so by the phospholipase C inhibitor NCDC. Alloantibodies specifically directed against class I antigens could then exert stimulation of phospholipase C-mediated phosphoinositide hydrolysis through the interaction with muscarinic cholinergic and/or alpha-adrenergic receptors. The induction of intracellular second messengers by class I antigens and hormone-receptor interactions is discussed.
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Affiliation(s)
- G A Cremaschi
- Centro de Estudios Farmacológicos y de Principios Naturales, CONICET, Buenos Aires, Argentina
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Hsuan JJ, Downward J, Clark S, Waterfield MD. Proteolytic generation of constitutive tyrosine kinase activity of the human insulin receptor. Biochem J 1989; 259:519-27. [PMID: 2719663 PMCID: PMC1138539 DOI: 10.1042/bj2590519] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Structural modification induced by partial digestion with trypsin has been shown to stimulate the tyrosine kinase activity of the insulin receptor both in solution and in intact cells [Tamura, Fujita-Yamaguchi & Larner (1983) J. Biol. Chem. 258, 14749-14752; Goren, White & Kahn (1987) Biochemistry 26, 2374-2382; Leef & Larner (1987) J. Biol. Chem. 262, 14837-14842]. Furthermore, experiments involving deletion of sequences encoding the extracellular domain of the insulin receptor suggest that it may function as a protooncogene in fibroblasts [Wang et al., (1987) Proc. Natl. Acad. Sci. U.S.A. 84, 5725-5729]. To further understand the structural requirements that generate this activity, the major activated fragments generated in solution following trypsin digestion have been characterized here, one of which is shown to have a similar amino acid sequence to a transforming protein. Furthermore, treatment with trypsin of intact Chinese hamster ovary cells that overexpress the human insulin receptor stimulates both autophosphorylation of the receptor and 2-deoxyglucose uptake into the cells, but does not enhance receptor internalization. Unlike digestion in solution, no proteolysis or loss of activity of the activated insulin receptor beta-subunit could be detected using intact cells, even at high trypsin concentrations, despite the existence of extracellular sites that are readily cleaved by trypsin in the solubilized receptor. These studies provide further detail of a mechanism used during trypsinization of cells in culture which mimics activation of the insulin receptor and contributes to stimulation of growth.
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Affiliation(s)
- J J Hsuan
- Ludwig Institute for Cancer Research, Middlesex Hospital/University College Branch, London U.K
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Backer JM, Kahn CR, White MF. Tyrosine Phosphorylation of the Insulin Receptor During Insulin-stimulated Internalization in Rat Hepatoma Cells. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)94242-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Abstract
We have studied the biosynthesis of the insulin receptor in a human hepatoma cell line, HepG2. As previously reported, these cells synthesize a disulphide-bonded alpha 2 beta 2 tetrameric insulin receptor. Labelling of HepG2 cells with [3H]palmitate or [3H]myristate followed by immunoprecipitation with a polyclonal antireceptor antibody revealed the incorporation of palmitate, but not myristate, into the beta-subunit and alpha beta-precursor of the receptor in a hydroxylamine-sensitive linkage. The extracellular alpha-subunit was not labelled, demonstrating the specificity of incorporation. Acylation of the insulin receptor was an early event as judged by fatty acid incorporation into the alpha beta-precursor and prevention by protein synthesis inhibitors. Pulse-chase studies demonstrated the expected processing of the alpha beta-precursor to mature alpha- and beta-subunits, but no evidence for preferential turnover of the fatty acid moiety was found. The site of acylation appears to be in the transmembrane or cytoplasmic domain since proteolytic treatment of intact cells produced a truncated beta-subunit still containing label. Binding studies showed that HepG2 cells contain approximately half as many insulin-like growth factor-1 receptors as insulin receptors, raising the possibility that this receptor may also be acylated. Indeed, immunoprecipitation with the antiinsulin receptor serum of MDCK cells expressing IGF-1 receptors, but not insulin receptors, revealed bands corresponding to the alpha beta-precursor, alpha- and beta-subunits, of which the alpha beta-precursor and beta-subunits incorporated [3H]palmitate but the alpha-subunit did not.
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Affiliation(s)
- A I Magee
- National Institute for Medical Research, Ridgeway, London, England
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