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Basic Research
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Hyperglycemia-Suppressed SMARCA5 Disrupts Transcriptional Homeostasis to Facilitate Endothelial Dysfunction in Diabetes
Ju Wang, Hui Zhou, Jinhua Shao, Shu Zhang, Jing Jin
Diabetes Metab J. 2023;47(3):366-381.   Published online March 6, 2023
DOI: https://doi.org/10.4093/dmj.2022.0179
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AbstractAbstract PDFSupplementary MaterialPubReader   ePub   
Background
Dysfunction of vascular endothelial cells (ECs) plays a central role in the pathogenesis of cardiovascular complications in diabetes. SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 5 (SMARCA5) is a key regulator of chromatin structure and DNA repair, but its role in ECs remains surprisingly unexplored. The current study was designed to elucidate the regulated expression and function of SMARCA5 in diabetic ECs.
Methods
SMARCA5 expression was evaluated in ECs from diabetic mouse and human circulating CD34+ cells using quantitative reverse transcription polymerase chain reaction and Western blot. Effects of SMARCA5 manipulation on ECs function were evaluated using cell migration, in vitro tube formation and in vivo wound healing assays. Interaction among oxidative stress, SMARCA5 and transcriptional reprogramming was elucidated using luciferase reporter assay, electrophoretic mobility shift assay and chromatin immunoprecipitation.
Results
Endothelial SMARCA5 expression was significantly decreased in diabetic rodents and humans. Hyperglycemia-suppressed SMARCA5 impaired EC migration and tube formation in vitro, and blunted vasculogenesis in vivo. Contrarily, overexpression of SMARCA5 in situ by a SMARCA5 adenovirus-incorporated hydrogel effectively promoted the rate of wound healing in a dorsal skin punch injury model of diabetic mice. Mechanistically, hyperglycemia-elicited oxidative stress suppressed SMARCA5 transactivation in a signal transducer and activator of transcription 3 (STAT3)-dependent manner. Moreover, SMARCA5 maintained transcriptional homeostasis of several pro-angiogenic factors through both direct and indirect chromatin-remodeling mechanisms. In contrast, depletion of SMARCA5 disrupted transcriptional homeostasis to render ECs unresponsive to established angiogenic factors, which ultimately resulted in endothelial dysfunction in diabetes.
Conclusion
Suppression of endothelial SMARCA5 contributes to, at least in part, multiple aspects of endothelial dysfunction, which may thereby exacerbate cardiovascular complications in diabetes.
Review
Pathophysiology
Glial and Vascular Cell Regulation of the Blood-Brain Barrier in Diabetes
Xiaolong Li, Yan Cai, Zuo Zhang, Jiyin Zhou
Diabetes Metab J. 2022;46(2):222-238.   Published online March 18, 2022
DOI: https://doi.org/10.4093/dmj.2021.0146
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  • 15 Web of Science
  • 15 Crossref
AbstractAbstract PDFPubReader   ePub   
As a structural barrier, the blood-brain barrier (BBB) is located at the interface between the brain parenchyma and blood, and modulates communication between the brain and blood microenvironment to maintain homeostasis. The BBB is composed of endothelial cells, basement membrane, pericytes, and astrocytic end feet. BBB impairment is a distinguishing and pathogenic factor in diabetic encephalopathy. Diabetes causes leakage of the BBB through downregulation of tight junction proteins, resulting in impaired functioning of endothelial cells, pericytes, astrocytes, microglia, nerve/glial antigen 2-glia, and oligodendrocytes. However, the temporal regulation, mechanisms of molecular and signaling pathways, and consequences of BBB impairment in diabetes are not well understood. Consequently, the efficacy of therapies diabetes targeting BBB leakage still lags behind the requirements. This review summarizes the recent research on the effects of diabetes on BBB composition and the potential roles of glial and vascular cells as therapeutic targets for BBB disruption in diabetic encephalopathy.

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Short Communication
Basic Research
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GPR40 Agonism Modulates Inflammatory Reactions in Vascular Endothelial Cells
Joo Won Kim, Eun Roh, Kyung Mook Choi, Hye Jin Yoo, Hwan-Jin Hwang, Sei Hyun Baik
Diabetes Metab J. 2022;46(3):506-511.   Published online January 24, 2022
DOI: https://doi.org/10.4093/dmj.2021.0092
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  • 235 Download
  • 8 Web of Science
  • 10 Crossref
AbstractAbstract PDFPubReader   ePub   
Endothelial dysfunction is strongly linked with inflammatory responses, which can impact cardiovascular disease. Recently, G protein-coupled receptor 40 (GPR40) has been investigated as a modulator of metabolic stress; however, the function of GPR40 in vascular endothelial cells has not been reported. We analyzed whether treatment of GPR40-specific agonists modulated the inflammatory responses in human umbilical vein endothelial cells (HUVECs). Treatment with LY2922470, a GPR40 agonist, significantly reduced lipopolysaccharide (LPS)-mediated nuclear factor-kappa B (NF-κB) phosphorylation and movement into the nucleus from the cytosol. However, treatment with another GPR40 agonist, TAK875, did not inhibit LPS-induced NF-κB activation. LPS treatment induced expression of adhesion molecules vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) and attachment of THP-1 cells to HUVECs, which were all decreased by LY2922470 but not TAK875. Our results showed that ligand-dependent agonism of GPR40 is a promising therapeutic target for overcoming inflammatory reactions in the endothelium.

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Review
Complications
Pathophysiology of Diabetic Retinopathy: The Old and the New
Sentaro Kusuhara, Yoko Fukushima, Shuntaro Ogura, Naomi Inoue, Akiyoshi Uemura
Diabetes Metab J. 2018;42(5):364-376.   Published online October 22, 2018
DOI: https://doi.org/10.4093/dmj.2018.0182
  • 16,250 View
  • 596 Download
  • 116 Web of Science
  • 116 Crossref
AbstractAbstract PDFPubReader   

Vision loss in diabetic retinopathy (DR) is ascribed primarily to retinal vascular abnormalities—including hyperpermeability, hypoperfusion, and neoangiogenesis—that eventually lead to anatomical and functional alterations in retinal neurons and glial cells. Recent advances in retinal imaging systems using optical coherence tomography technologies and pharmacological treatments using anti-vascular endothelial growth factor drugs and corticosteroids have revolutionized the clinical management of DR. However, the cellular and molecular mechanisms underlying the pathophysiology of DR are not fully determined, largely because hyperglycemic animal models only reproduce limited aspects of subclinical and early DR. Conversely, non-diabetic mouse models that represent the hallmark vascular disorders in DR, such as pericyte deficiency and retinal ischemia, have provided clues toward an understanding of the sequential events that are responsible for vision-impairing conditions. In this review, we summarize the clinical manifestations and treatment modalities of DR, discuss current and emerging concepts with regard to the pathophysiology of DR, and introduce perspectives on the development of new drugs, emphasizing the breakdown of the blood-retina barrier and retinal neovascularization.

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    Elisa Vazquez-Liebanas, Khayrun Nahar, Giacomo Bertuzzi, Annika Keller, Christer Betsholtz, Maarja Andaloussi Mäe
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  • Investigation on the Q-markers of Bushen Huoxue Prescriptions for DR treatment based on chemometric methods and spectrum-effect relationship
    Yueting Yu, Ziyu Zhu, Mengjun Xie, Liping Deng, Xuejun Xie, Mei Zhang
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    Thomas L. Maurissen, Georgios Pavlou, Colette Bichsel, Roberto Villaseñor, Roger D. Kamm, Héloïse Ragelle
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  • Long-Term Oral Administration of Salidroside Alleviates Diabetic Retinopathy in db/db Mice
    Fei Yao, Xinyi Jiang, Ling Qiu, Zixuan Peng, Wei Zheng, Lexi Ding, Xiaobo Xia
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    Xuqian Wang, Yu Gu
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    Yingying Zeng, Van Phuc Nguyen, Yanxiu Li, Do Hyun Kang, Yannis M. Paulus, Jinsang Kim
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  • LncRNA FLG-AS1 Mitigates Diabetic Retinopathy by Regulating Retinal Epithelial Cell Inflammation, Oxidative Stress, and Apoptosis via miR-380-3p/SOCS6 Axis
    Rong Luo, Lan Li, Fan Xiao, Jinsong Fu
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Original Articles
High Glucose and/or Free Fatty Acid Damage Vascular Endothelial Cells via Stimulating of NAD(P)H Oxidase-induced Superoxide Production from Neutrophils.
Sang Soo Kim, Sun Young Kim, Soo Hyung Lee, Yang Ho Kang, In Ju Kim, Yong Ki Kim, Seok Man Son
Korean Diabetes J. 2009;33(2):94-104.   Published online April 1, 2009
DOI: https://doi.org/10.4093/kdj.2009.33.2.94
  • 2,313 View
  • 21 Download
AbstractAbstract PDF
BACKGROUND
Oxidative stress and inflammation are important factors in the pathogenesis of diabetes and contribute to the development of diabetic complications. To understand the mechanisms that cause vascular complications in diabetes, we examined the effects of high glucose and/or free fatty acids on the production of superoxide from neutrophils and their role in endothelial cell damage. METHODS: Human neutrophils were incubated in the media containing 5.5 mM D-glucose, 30 mM D-glucose, 3 nM oleic acid, or 30 microM oleic acid for 1 hour to evaluate superoxide production through NAD(P)H oxidase activation. Human aortic endothelial cells were co-cultured with neutrophils exposed to high glucose and oleic acid. We then measured neutrophil adhesion to endothelial cells, neutrophil activation and superoxide production, neutrophil-mediated endothelial cell cytotoxicity and subunits of neutrophil NAD(P)H oxidase. RESULTS: After 1 hour of incubation with various concentrations of glucose and oleic acid, neutrophil adherence to high glucose and oleic acid-treated endothelial cells was significantly increased compared with adhesion to low glucose and oleic acid-treated endothelial cells. Incubation of neutrophils with glucose and free fatty acids increased superoxide production in a dose-dependent manner. High glucose and oleic acid treatment significantly increased expression of the membrane components of NAD(P)H oxidase of neutrophil (gp91(phox)). Endothelial cells co-cultured with neutrophils exposed to high glucose and oleic acid showed increased cytolysis, which could be prevented by an antioxidant, N-acetylcysteine. CONCLUSION: These results suggest that high glucose and/orfree fatty acidsincrease injury of endothelial cells via stimulating NAD(P)H oxidase-induced superoxide production from neutrophils.
Protective Effect of PGC-1 on Lipid Overload-induced Apoptosis in Vascular Endothelial Cell.
Eun Hee Koh, Youn Mi Kim, Ha Jung Kim, Woo Je Lee, Jong Chul Won, Min Seon Kim, Ki Up Lee, Joong Yeol Park
Korean Diabetes J. 2006;30(3):151-160.   Published online May 1, 2006
DOI: https://doi.org/10.4093/jkda.2006.30.3.151
  • 2,183 View
  • 17 Download
AbstractAbstract PDF
BACKGROUND
Fatty acids contribute to endothelial cell dysfunction and apoptosis by inducing accumulation of long chain fatty acyl CoA (LCAC), which increases oxidative stress in vascular endothelial cells. Forced expression of PGC-1 was shown to induce mitochondrial biogenesis and to control expression of mitochondrial enzymes involved in fatty acid oxidation. This study was undertaken to test the hypothesis that PGC-1 overexpression could prevent endothelial cell apoptosis by enhancing fatty acid oxidation and relieving oxidative stress in vascular endothelium. METHODS: Adenoviruses containing human PGC-1 (Ad-PGC-1) and beta-galactosidase (Ad-beta-gal) were transfected to confluent human aortic endothelial cells (HAECs). To investigate the effect of adenoviral PGC-1 gene transfer on apoptosis, combined treatment of linoleic acid (LA), an unsaturated fatty acid, was performed. RESULTS: PGC-1 overexpression inhibited the increase in ROS production and apoptosis of HAECs induced by LA. Also, PGC-1 led to a significant increase in fatty acid oxidation and decrease in triglyceride content in HAECs. LA caused the decrease of adenine nucleotide translocase (ANT) activity and transient mitochondrial hyperpolarization, which was followed by depolarization. PGC-1 overexpression prevented these processes. CONCLUSION: In summary, PGC-1 overexpression inhibited mitochondrial dysfunction and apoptosis by facilitating fatty acid oxidation and protecting against the damage from oxidative stress in HAECs. The data collectively suggest that the regulation of intracellular PGC-1 expression might play a critical role in preventing atherosclerosis.
Effect and Mechanism of High Glucose Level on the Expression of an Adhesion Protein, beta ig-h3, and Cellular Function in Endothelial Cells.
Sung Woo Ha, Hye Jin Yeo, Jong Sup Bae, Sung Chang Chung, Jung Guk Kim, In San Kim, In Kyu Lee, Bo Wan Kim
Korean Diabetes J. 2003;27(4):323-331.   Published online August 1, 2003
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  • 16 Download
AbstractAbstract PDF
BACKGROUND
Diabetes mellitus is a high risk condition for the development of atherosclerotic and thromboembolic macroangiopathy. There are many factors which are involved in development of these processes. Given the central pathogenic role of endotheliopathy in atherosclerosis, it is likely that this vascular monolayer is the ultimate target of injury in response to many cytokines and growth factors. A dysfunctional endothelium may contribute to the proatherogenic environment. Transforming growth factor (TGF-beta) is a key factor in the development of diabetic angiopathy and atherosclerosis because of its effect on the accumulation of extracellular matrix proteins and endothelial function. The adhesive molecule betaig-h3 is an extracellular matrix protein whose expression is induced by TGF-beta. Considering that TGF-beta plays an important role in diabetic complications and that betaig-h3 is a downstream target gene of TGF-beta, we hypothesized that betaig-h3 may also play a role in the development of diabetic angiopathy through its effect on the endothelial function. Therefore, we examined the effects of high glucose level on the expression of betaig-h3 and endothelial function in human umbilical vein endothelial cells (HUVECs). We also studied the mechanisms of this high glucose-induced betaig-h3 expression. METHODS: Endothelial cells were isolated from human umbilical cord and conditioned with different concentrations of TGF-beta or glucose. We measured TGF-beta and betaig-h3 protein presence/concentration/expression in cell supernatant by ELISA and examined whether TGF-beta is involved in high glucose-induced betaig-h3 expression. Finally, we investigated the biologic function of betaig-h3 in endothelial cells by using adhesion assay. RESULTS: Our study demonstrated that both high glucose level and TGF-beta induced betaig-h3 protein expression in HUVECs. High glucose level also induced TGF-beta protein expression in cells. Anti-TGF-beta antibody almost completely blocked high glucose-induced betaig-h3 expression. betaig-h3 was found to support the adhesion of endothelial cells. CONCLUSION: These results suggest that high glucose level upregulates betaig-h3 protein levels through the induction of TGF-beta and that betaig-h3 may play an important role in diabetic angiopathy by regulating adhesive function of endothelial cells.
The Effect of Nitric Oxide on Insulin Binding and Insulin Receptor Recycling in Bovine Aortic Endothelial Cells.
Hyuk Sang Kwon, Oak Kee Hong, Hee Soo Kim, Jung Min Lee, Sung Rae Kim, Sung Dae Moon, Sang Ah Jang, Hyun Shik Son, Kun Ho Yoon, Moo Il Kang, Bong Yun Cha, Kwang Woo Lee, Ho Young Son, Sung Koo Kang
Korean Diabetes J. 2003;27(3):213-227.   Published online June 1, 2003
  • 1,018 View
  • 16 Download
AbstractAbstract PDF
BACKGROUND
The coexistence of insulin resistance and endothelial dysfunction is commonly observed in a variety of metabolic and cardiovascular disorders, including athero-sclerosis and type 2 diabetes mellitus. Because nitric oxide (NO), or nitric oxide synthase (NOS), has been suggested as a significant contributing factor in the development of endothelial dysfunction and insulin resistance, reactive NO or NOS were investigated to see if they contribute to the insulin internalization pathway. METHODS: The production of NO (Nitrite), the expression of eNOS (endothelial NOS), insulin binding and the insulin receptor internalization and recycling, following 48 hours of incubation with bradykinin (BK), acetylcholine (Ach), NG-monomethyl- L-arginine (L-NMMA) and N-nitro-L-arginine methylester (L-NAME) in Bovine aortic endothelial cells (BAECs), were examined. RESULTS: The results were as follows: 1. In relation to the time course, the production of eNOS was increased, but was decreased after 8 hours of incubation. The production of eNOS in the L-NMMA and L-NAME treated groups was significantly decreased compared with that of the controls (p<0.05). 2. The specific insulin bindings to the receptors of the endothelial cells were maximized within 20 mins, and then decreased. At 20 mins, the binding rate of the L-NMMA treated group was significantly decreased compared to that of the controls. At a concentration of 0.4ng/ml of unlabelled insulin, the specific insulin binding of the L-NMMA treated group was significantly decreased compared to that of the controls (p<0.05). 3. The internalization of 125I-insulin into the endothelial cells, as assessed by the acid washing dissociation method, occurred rapidly. The internalized radioactivity of 125I-insulin, at 20 mins, was significantly increased in the BK and Ach groups compared with the controls (p<0.05). 4. The recycling of the internalized insulin receptors showed no significant differences between the study groups, but the recycling was slightly delayed compared with controls in the Ach group. CONCLUSION: In conclusion, the NO generating substances, BK and Ach, and the inhibitory substance, L-NMMA, may influence the binding and internalization of insulin-insulin receptors. Our results suggest that NO might contribute to the transcytosis of insulin in BAECs
Effect of High Glucose Concentration on Expression of Adhesion Molecules in Endothelial Cells.
In Ju Kim, Seok Man Son, Min Ki Lee, Hee Jeong, Yong Ki Kim
Korean Diabetes J. 1998;22(3):280-289.   Published online January 1, 2001
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BACKGROUND
Accelerated atherosclerotic vascular disease is the leading cause of mortality in patients with diabetes mellitus. Endothelial dysfunction, monocytes, and platelets are well known pathogenic factors in atherogenesis. Changes in the neutrophils and endothelial cells, an important early events in all inflammatory process, may contribute to the atherogenesis at early stage, but the significance of this process is not established yet. So we investigated the effects of glucose on the expression of adhesion molecules in endothelial cells, which retlects the change in endothelial-neutrophil adhesive interactions.METHODS: The human umbilical vein endothelial cells(HUVECs) are purchased from American Type Culture Collection. The cells were incubated upto 24 hours to evaluate the expression of E-selectin, PECAM-1, and P-selectin on the cell surface using whole cell ELISA method and soluble P-selectin under different glucose concentration(5.5, 15, and 30 mmol/L). Neutrophil adherence was also measured hy incubation of isolated human neutrophils with monolayers of HUVECs under same different glucose concentration. RESULTS: After 24h incubation with a various concentration of glucose, neutrophil adherence to high concentration of glucose(15 and 30mmol/L)- treated endothelium was significantly increased(5.0 +0.4 and 10.4+0.5%, respectively) compared with adhesion to low concentration of glucose(5.5mmol/ L)-treated endothelium(2.9.+0.4%). Incubation of HUVECs for 24 h in 30mmol/L glucose increased absorbance of E-selectin to 1.36+0.16(P<0.01) and reduced that of P-selectin to 0.56+0.04 compared with the results of respective control culture in 5.5mmol/L glucose(p<0.01), but not changed PECAM-1 expression. In addition, 24 h exposure of HUVECs to 30mmol/L glucose decreased soluble P-selectin concentration to 0.33+0.06ng/mL(P<0.01). CONCLUSION: The results of this study demonstrate that high concentration of glucose stimulates neutrophil adhesion to endothelial cells in association with increased expression of E-selectin. These results suggest that high glucose can directly affect interaction between neutrophil and endothelial cell through a adhesion molecule, especially E-selectin dependent mechanism. Further study should be necessary to investigate the significance of this phenomenon.
Effects of Free Fatty Acids on Glutathione Redox Status in Cultured Endothelial Cells.
Joong Yeol Park, Chul Hee Kim, Yun Ey Chung, Hong Kyu Kim, Young Il Kim, Sung Kwan Hong, Jae Dam Lee, Ki Up Lee
Korean Diabetes J. 1998;22(3):262-270.   Published online January 1, 2001
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BACKGROUND
Although plasma free fatty acids (FFA) are frequently elevated in diabetes mellitus, its role in the pathogenesis of diabetic vascular complications has not been well investigated. Recent stuclies reported that FFA may cause endothelial dysfunction through an enhancement of oxidative damage by decreasing glutathione redox cycle, an important anti-oxidant defense system in endothelial cells. In this study, we examined the effects of increased availability of FFA on intracellular glutathione redox cycle. METHODS: Bovine pulonary endothelial cells were exposed to 90 umol/L linoleic acid with or without 0.1 mM 2-bromopalmitate, an inhibitor of mitochondrial fatty acid oxidation, for 6hr. Components of the glutathione redox cycle such as total glutathione, reduced glutathione(GSH) and oxidized glutathione(GSSG) concentrations were measured by HPLC. RESULTS: Total glutathione concentration in cultured endothelial cells exposed to linoleic acid was significantly lower than that in control cells (10.8+ 0.5 vs 14.1+0.8 umol/g protein, P<0.05). Linoleic acid significantly decreased GSH concentrations (10.5+0.4 vs. 13.8+0.5 pmol/g protein, P<0.05) and the ratio of GSH/GSSG(26.3+1.3 vs. 47.0+2,1, P<0.05). Compared to cells exposed linoleic acid alone, total glutathione(13.5+0.5umol/g protein, P<0.05) and GSH concentration(13.2+0.4 pmol/g protein, P<0.05) significantly increased in cells treated with 2-bromopalmitate and linoleic acid. The ratio of GSH/GSSG in cells treated with 2-bromopalmitate and linoleic acid was higher th.an that in cells exposed to linoleic acid alone(44.1+1.3, P<0.05). CONCLUSION: Increased provision of FFA resulted in a derangement of glutathione redox cycle in cultured endothelial cells, which appears to be related to an increase in mitochondrial FFA oxidation. These results suggested that FFA can increase the risk of diabetic vascular complications.
Effect of Glucose on Adherence of Neutrophils to Endothelial Cells.
Seok Man Son, Seok Dong Yoo, In Ju Kim, Yong Ki Kim, Hee Bag Park, Chi Dae Kim, Ki Whan Hong
Korean Diabetes J. 1997;21(3):262-270.   Published online January 1, 2001
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BACKGROUND
Accelerated atherosclerotic vascular disease is the leading cause of mortality in patients with diabetes mellitus. To clarify the mechanisms that cause macrovascular dysfunction in diabetes, we examined the effect of high glucose on the adhesion of neutrophils to the endothelial cells and release of TNF-a from cultured rabbit aortic endotheIial cells. METHODS: Rabbit aortic endothelial cells in primary culture were prepared by the collagenase digestion method. Cells were incubated for various time upto 24 hours to evaluate TNF-a response to different glucose concentrations(0, 5.5, 11, 22mmol/L). Isolated rabbit neutrophils were incubated with monolayers of rabbit aortic endothelial cells under different glucose condition. RESULTS: After 24 hrs incubation with various concentrations of glucose, neutrophil adherence to high concentration of glucose(11 and 22mM)-treated endothelium was significantly increased(46+/-7 and 64 +/-6%, respectively) compared with adhesion to low concentration of glucose(0 or 5.5mM)-treated endothelium(3l +/-5 and 30+/-3%, respectively), In addition, when TNF-a imrnunoreactivity in the culture medium was measured by enzyme-linked immunoassay after 24 hours of incubation with various concentration of glucose, the secretion of TNF-a from endothelial cells was significantly increased in a concentration-dependent manner upon exposure to high concentration of glucose, CONCLUSION: The results of this study ciemonstrate tht high concentration of glucose stimulates neutrophil adhesion to endothelial cells in association with increased production of TNF-a from endothelial cells. These results suggest that glucose directly causes increased interaction between neutrophil and endothelial cell through a TNF-a-dependent mechaniasm,

Diabetes Metab J : Diabetes & Metabolism Journal
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