scholarly journals High Glucose and Advanced Glycation End Products Induce CD147-Mediated MMP Activity in Human Adipocytes

Cells ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 2098
Author(s):  
Abeer M. Mahmoud ◽  
Mohamed M. Ali
Keyword(s):  
High Glucose ◽  
Cardiovascular Complications ◽  
Human Adipocytes ◽  
Mediating Role ◽  
Transmembrane Glycoprotein ◽  
Mmp9 Expression ◽  
Glycation End Products ◽  
End Products ◽  
Cd147 Expression ◽  
Glycosylation Inhibitor

Basigin (CD147) is a transmembrane glycoprotein that regulates several physiological processes, including the production and activity of matrix metalloproteinases (MMPs). The activity of CD147 depends mainly on its glycosylation, which varies among pathophysiological conditions. However, it is unknown whether CD147 activity or its function in MMP regulation are affected by the diabetic environment, which is characterized by high glucose (HG) levels and an excess of glycation end products (AGEs). In this study, we investigated the effect of HG and AGEs on CD147 expression in human adipocytes. We also examined the mediating role of nuclear factor kappa B (NFκB) and receptor of AGE (RAGE) to this effect. Our findings show that carboxymethyl lysine and HG increased CD147 expression and glycosylation, which was accompanied by increases in MMP2 and MMP9 expression and activity, as well as upregulations of the N-acetylglucosaminyltransferase, MGAT5. These effects were abolished by NFκB and RAGE inhibition, CD147 gene silencing, and by the glycosylation inhibitor, tunicamycin. In conclusion, the current findings indicate that AGEs and HG induce CD147 expression and glycosylation in adipocytes, with possible mediation by NFκB and RAGE. One of the critical outcomes of this pathway is augmented MMP activity known to contribute to cardiovascular complications in diabetes.

Monocyte CD147 is induced by advanced glycation end products and high glucose concentration: possible role in diabetic complications

2010 ◽  
Vol 299 (5) ◽  
pp. C1212-C1219 ◽  
Author(s):  
W. Bao ◽  
D. Min ◽  
S. M. Twigg ◽  
N. A. Shackel ◽  
F. J. Warner ◽  
...  
Keyword(s):  
Advanced Glycation End Products ◽  
Diabetic Complications ◽  
High Glucose ◽  
Transmembrane Protein ◽  
Soluble Form ◽  
Dependent Manner ◽  
Advanced Glycation ◽  
Glycation End Products ◽  
End Products ◽  
Cd147 Expression

CD147 is a highly glycosylated transmembrane protein that is known to play a role in regulation of many protein families. It has the unique ability to maintain functional activity in both the membrane bound state and in the soluble form. CD147 is known to play a role in regulation of matrix metalloproteinase (MMP) expression, but whether its expression is affected by the diabetic milieu is not known, and its role in regulation of monocyte MMPs in this environment has not been investigated. Therefore, in this study we investigated the effect of advanced glycation end products (AGEs) and high glucose (HG; 25 mM), on monocyte CD147 expression. Culture of THP-1 monocytes in the presence of AGEs or HG significantly increased CD147 at the gene and protein level. THP-1 cell results were confirmed using freshly isolated monocytes from human volunteers. The effect of AGEs and HG on CD147 expression was also mimicked by addition of proinflammatory cytokines. Addition of AGEs or HG also increased expression of monocyte MMP-1 and MMP-9 but not MMP-2. This increase in MMPs was significantly attenuated by inhibition of CD147 using either a small interfering RNA or an anti-CD147 antibody. Inhibition of NF-κB or addition of antibodies to either TNF-α or the receptor for AGE (RAGE) each significantly prevented in a dose-dependent manner the induction of CD147 gene and protein by AGE and also decreased MMP-1 and MMP-9. This novel result shows that AGEs can induce monocyte CD147 expression, an effect mediated by inflammatory pathways and RAGE. Because MMPs play a role in monocyte migration, inhibition of their regulator CD147 may assist in the prevention of diabetic complications, particularly those where monocyte infiltration is an early initiating event.

Citrus Fruit Extracts Reduce Advanced Glycation End Products (AGEs)- and H2O2-Induced Oxidative Stress in Human Adipocytes

2010 ◽  
Vol 58 (20) ◽  
pp. 11119-11129 ◽  
Author(s):  
Deena Ramful ◽  
Evelyne Tarnus ◽  
Philippe Rondeau ◽  
Christine Robert Da Silva ◽  
Theeshan Bahorun ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Advanced Glycation End Products ◽  
Citrus Fruit ◽  
Human Adipocytes ◽  
Advanced Glycation ◽  
Fruit Extracts ◽  
Glycation End Products ◽  
End Products

scholarly journals Effect of thioltransferase on oxidative stress induced by high glucose and advanced glycation end products in human lens epithelial cells

2021 ◽  
Vol 14 (7) ◽  
pp. 965-972
Author(s):  
Qing Liu ◽  
◽  
Hong Yan ◽  
Keyword(s):  
Oxidative Stress ◽  
Epithelial Cells ◽  
Advanced Glycation End Products ◽  
High Glucose ◽  
Human Lens ◽  
Lens Epithelial Cells ◽  
Advanced Glycation ◽  
Human Lens Epithelial Cells ◽  
Glycation End Products ◽  
End Products

AIM: To study the effect of thioltransferase (TTase) on oxidative stress in human lens epithelial cells (HLECs) induced by high glucose and advanced glycation end products (AGEs). METHODS: HLECs were treated with 35.5 mmol/L glucose or 1.5 mg/mL AGEs modified bovine serum albumin (AGEs-BSA) as the experimental groups, respectively. Cells were collected at the time point of 1, 2, 3, and 4d. The TTase activity were measured accordingly. TTase mRNA levels were detected by quantitative reverse transcription polymerase chain response (qRT-RCR) and its protein level was detected by Western blot. The siRNA was used to knock down the expression of TTase. The activity of catalase (CAT) and superoxide dismutase (SOD), the content of reactive oxygen species (ROS) and the ratio of oxidized glutathione/total glutathione (GSSG/T-GSH) were assessed in different groups, respectively. RESULTS: The level of TTase mRNA gradually increased and reached the top at 2d, then it decreased to the normal level at 4d, and the TTase activity increased from 2 to 3d in both high glucose and AGEs-BSA groups. The TTase expression elevated from 2d in high glucose group, and it began to rise from 3d in AGEs-BSA group. The activity of CAT and SOD showed a decrease and the content of ROS and the ratio of GSSG/T-GSH showed an increase in high glucose and AGEs-BSA group. These biochemical alterations were more prominent in the groups with TTase siRNA. CONCLUSION: High glucose and AGEs can increase ROS content in HLECs; therefore, it induces oxidative stress. This may result in the decreased GSH and increased GSSG content, impaired activity of SOD and CAT. The up-regulated TTase likely provides oxidation damage repair induced by high glucose and AGEs in the early stage.

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