51
|
Cai W, Sun JF, Liu Y, Xu JX, Xiao JR, Duan XM, Liu JY, Zhang W. Relationship between serum levels of endogenous secretory RAGE and blood pressure in male nondiabetic patients with obstructive sleep apnea. J Hum Hypertens 2015; 29:713-8. [PMID: 25994997 DOI: 10.1038/jhh.2015.46] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 04/09/2015] [Accepted: 04/16/2015] [Indexed: 12/25/2022]
Abstract
The interaction of advanced glycation end products (AGE) and their specific cell-surface receptor (RAGE) has an important role in the pathogenesis of cardiovascular disease and diabetic complications. Two isoforms of C-truncated RAGE, soluble RAGE (sRAGE) and endogenous secretory RAGE (esRAGE), may prevent activation of RAGE signaling by acting as decoys. This study investigated whether serum esRAGE and sRAGE levels are associated with blood pressure in nondiabetic patients with obstructive sleep apnea (OSA). Male nondiabetic patients (n=139) with OSA were enrolled. Serum esRAGE and sRAGE levels were examined using enzyme-linked immunosorbent assay. Three consecutive seated systolic blood pressure (SBP) and diastolic blood pressure (DBP) measurements were obtained at 5-min intervals in the morning. In univariate analysis, there was a significant correlation between serum esRAGE and SBP or DBP, but not between serum sRAGE and SBP or DBP. Multiple regression analysis showed that SBP was independently associated with waist circumference, HbA1c, minimum SaO2 and serum esRAGE, and that DBP was independently associated with low-density lipoprotein cholesterol, apnea-hypopnea index, serum AGE and body mass index, but not with serum esRAGE. These results indicated that serum esRAGE levels were inversely associated with blood pressure, especially SBP, in male nondiabetic patients with OSA. esRAGE may have a protective role against hypertension in patients with OSA, and it may be a novel biomarker for OSA patients at high risk of developing cardiovascular diseases.
Collapse
Affiliation(s)
- W Cai
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China.,Department of Medical Biology, Medical College of Nanchang University, Nanchang, People's Republic of China
| | - J-F Sun
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China
| | - Y Liu
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China
| | - J-X Xu
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China
| | - J-R Xiao
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China
| | - X-M Duan
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China
| | - J-Y Liu
- Department of Endocrinology and Metabolism, First Affiliated Hospital of Nanchang University, Nanchang, People's Republic of China
| | - W Zhang
- Department of Respiratory Medicine, First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People's Republic of China
| |
Collapse
|
52
|
Hagen I, Schulte DM, Müller N, Martinsen J, Türk K, Hedderich J, Schreiber S, Laudes M. Soluble receptor for advanced glycation end products as a potential biomarker to predict weight loss and improvement of insulin sensitivity by a very low calorie diet of obese human subjects. Cytokine 2015; 73:265-9. [PMID: 25802195 DOI: 10.1016/j.cyto.2015.02.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/21/2015] [Accepted: 02/09/2015] [Indexed: 01/13/2023]
Abstract
INTRODUCTION Obesity is associated with low-grade systemic inflammation which is thought to trigger the development of comorbidities such as type 2 diabetes. The soluble receptor for advanced glycation end products (sRAGE) belongs to the innate immune system and has been linked to obesity, recently. The aim of the present study was to examine whether serum sRAGE concentrations are related to the grade of weight loss and improvement of insulin resistance due to a very low calorie diet (VLCD). METHODS 22 severe obese subjects (Median Body Mass Index (BMI): 44.5kg/m(2)) were included in a dietary intervention study of 6month, consisting of a very low calorie formula diet phase (VLCD: 800kcal/d) for 12 weeks and a following 12 week weight maintenance phase. Fasting glucose, fasting insulin, adiponectin, leptin and sRAGE were determined from sera. Insulin sensitivity was estimated by Homeostasis Model Assessment (HOMA) index and leptin-to-adiponectin-ratio (LAR). RESULTS Mean body weight reduction by VLCD accounted to 21.7kg with a significant improvement of insulin resistance. At baseline, sRAGE serum levels were significantly inversely related to BMI (rS=-0.642, p=0.001) and HOMA (rS=-0.419, p=0.041). Of interest, sRAGE serum levels at baseline were significantly lower in study subjects with greater reduction of BMI (p=0.017). In addition, a significantly greater HOMA reduction was observed in subjects with lower sRAGE serum levels at baseline (p=0.006). Finally, correlation analysis revealed, that changes of sRAGE serum levels were significantly correlated to changes of BMI (rS=-0.650, p=0.022) during intervention. CONCLUSION Anti-inflammatory sRAGE might be a potential future biomarker to predict weight loss and improvement of insulin resistance by a VLCD whereby lower baseline sRAGE serum levels indicate a better outcome of the dietary intervention.
Collapse
Affiliation(s)
- Imke Hagen
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany.
| | - Dominik M Schulte
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany.
| | - Nike Müller
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany
| | - Jessica Martinsen
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany
| | - Kathrin Türk
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany
| | - Jürgen Hedderich
- Institute of Medical Informatics and Statistics, University of Kiel, Brunswiker Straße 10, 24105 Kiel, Germany
| | - Stefan Schreiber
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany
| | - Matthias Laudes
- Department I of Internal Medicine, University of Kiel, Arnold-Heller-Straße 3, 24105 Kiel, Germany.
| |
Collapse
|
53
|
The role of receptor for advanced glycation end products in airway inflammation in CF and CF related diabetes. Sci Rep 2015; 5:8931. [PMID: 25754382 PMCID: PMC4354142 DOI: 10.1038/srep08931] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 02/11/2015] [Indexed: 11/28/2022] Open
Abstract
Cystic Fibrosis (CF) is often accompanied by diabetes leading to worsening lung function, the reason for which is unclear. The receptor for advanced-glycation-end-products (RAGE) regulates immune responses and inflammation and has been linked to diabetes and possibly CF. We performed a pilot study to determine if CF and CF-related diabetes (CFRD) are associated with enhanced RAGE expression. Full length (fl)RAGE, soluble (s)RAGE, endogenous soluble (es)RAGE, S100A12 (enRAGE) and advanced-glycation-end-products (AGE) expression was assessed in serum, white blood cells and sputum of patients with CF; diabetes; CFRD and healthy subjects. Sputum enRAGE/sRAGE ratios were high in CF but particularly in CFRD which negatively correlated with % predicted FEV1. Serum AGE and AGE/sRAGE ratios were high in diabetics but not in CF. A complex, multifaceted approach was used to assess the role of RAGE and its ligands which is fundamental to determining their impact on airway inflammation. There is a clear association between RAGE activity in the airways of CF and CFRD patients that is not evident in the vascular compartment and correlates with lung function, in contrast to diabetes. This strongly suggests a role for RAGE in contributing to the inflammatory overdrive seen in CF and to a greater extent in CFRD.
Collapse
|
54
|
Takeuchi M, Takino JI, Sakasai-Sakai A, Takata T, Ueda T, Tsutsumi M, Hyogo H, Yamagishi SI. Involvement of the TAGE-RAGE system in non-alcoholic steatohepatitis: Novel treatment strategies. World J Hepatol 2014. [PMID: 25544875 DOI: 10.4254/wjh.6.i12.880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a major cause of liver disease around the world. It includes a spectrum of conditions from simple steatosis to non-alcoholic steatohepatitis (NASH) and can lead to fibrosis, cirrhosis, liver failure, and/or hepatocellular carcinoma. NAFLD is also associated with other medical conditions such as obesity, diabetes mellitus (DM), metabolic syndrome, hypertension, insulin resistance, hyperlipidemia, and cardiovascular disease (CVD). In diabetes, chronic hyperglycemia contributes to the development of both macro- and microvascular conditions through a variety of metabolic pathways. Thus, it can cause a variety of metabolic and hemodynamic conditions, including upregulated advanced glycation end-products (AGEs) synthesis. In our previous study, the most abundant type of toxic AGEs (TAGE); i.e., glyceraldehyde-derived AGEs, were found to make a significant contribution to the pathogenesis of DM-induced angiopathy. Furthermore, accumulating evidence suggests that the binding of TAGE with their receptor (RAGE) induces oxidative damage, promotes inflammation, and causes changes in intracellular signaling and the expression levels of certain genes in various cell populations including hepatocytes and hepatic stellate cells. All of these effects could facilitate the pathogenesis of hypertension, cancer, diabetic vascular complications, CVD, dementia, and NASH. Thus, inhibiting TAGE synthesis, preventing TAGE from binding to RAGE, and downregulating RAGE expression and/or the expression of associated effector molecules all have potential as therapeutic strategies against NASH. Here, we examine the contributions of RAGE and TAGE to various conditions and novel treatments that target them in order to prevent the development and/or progression of NASH.
Collapse
Affiliation(s)
- Masayoshi Takeuchi
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Jun-Ichi Takino
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Akiko Sakasai-Sakai
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Takanobu Takata
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Tadashi Ueda
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Mikihiro Tsutsumi
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Hideyuki Hyogo
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| | - Sho-Ichi Yamagishi
- Masayoshi Takeuchi, Akiko Sakasai-Sakai, Takanobu Takata, Tadashi Ueda, Department of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Ishikawa 920-0293, Japan
| |
Collapse
|
55
|
Cheng Y, Zhong J, Xiang Y, Zeng F, Cai D, Zhao L. Soluble receptor for advanced glycation end products in critically ill patients and its associations with other clinical markers and 28-day mortality. Clin Interv Aging 2014; 9:1981-6. [PMID: 25429209 PMCID: PMC4242067 DOI: 10.2147/cia.s71130] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Purpose To investigate the possible associations between serum levels of soluble receptor for advanced glycation end products (sRAGE) and specific clinical markers and prognosis in critically ill patients diagnosed with stress hyperglycemia. Patients and methods A total of 70 critically ill patients and 25 normal controls were recruited for this study. Serum levels of sRAGE and advanced glycation end products (AGEs) were determined using enzyme-linked immunosorbent assay. Additional data on other clinical markers were obtained from patient records in the intensive care unit. Comparisons of sRAGE and AGEs levels between groups were assessed by t-test. The relationships between sRAGE and other clinical markers were assessed by Pearson’s correlation analyses and multiple linear regression analyses. Risk factors for prognosis, such as 28-day mortality were analyzed using logistic regression analysis. Results Serum sRAGE and AGEs levels were significantly higher in critically ill patients, compared to normal controls (P<0.05). The increase in serum sRAGE levels was significantly correlated with AGEs levels, interleukin-6 levels, and the sequential organ failure assessment score (P<0.01). Using multiple linear regression analysis, the association between AGEs and sRAGE remained significant after adjustment of other clinical factors. However, there were no significant correlations between sRAGE levels and patient outcome in these critically ill patients. Conclusion Serum sRAGE levels were significantly elevated in critically ill patients and positively correlated with higher AGEs levels, but sRAGE levels were not associated with increased mortality, suggesting sRAGE levels are not a predictor of prognosis in critically ill patients.
Collapse
Affiliation(s)
- Yanzi Cheng
- Department of Intensive Care Unit, Zhuhai People's Hospital, Zhuhai, Guangdong, People's Republic of China
| | - Jiwen Zhong
- Department of Intensive Care Unit, Zhuhai People's Hospital, Zhuhai, Guangdong, People's Republic of China
| | - Yang Xiang
- Department of Intensive Care Unit, Zhuhai People's Hospital, Zhuhai, Guangdong, People's Republic of China
| | - Fan Zeng
- Department of Intensive Care Unit, Zhuhai People's Hospital, Zhuhai, Guangdong, People's Republic of China
| | - Dehong Cai
- Department of Endocrinology, Zhujiang Hospital of Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Ling Zhao
- Department of Intensive Care Unit, Zhuhai People's Hospital, Zhuhai, Guangdong, People's Republic of China
| |
Collapse
|
56
|
Soluble receptor for advanced glycation end products (sRAGE) and carotid intima-media thickness (CIMT) in type 1 diabetes Mellitus: Possible association with diabetic vascular complications. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2014. [DOI: 10.1016/j.ejmhg.2014.06.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
|
57
|
Prasad K. Low levels of serum soluble receptors for advanced glycation end products, biomarkers for disease state: myth or reality. Int J Angiol 2014; 23:11-6. [PMID: 24627612 DOI: 10.1055/s-0033-1363423] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Advanced glycation end products (AGEs) interact with the receptor for AGEs (RAGE) on the membrane and induce deleterious effects via activation of nuclear factor kappa-B, and increased oxidative stress and inflammatory mediators. AGEs also combine with circulating soluble receptors (endogenous secretory RAGE [esRAGE] and soluble receptor for RAGE [sRAGE]) and sequester RAGE ligands and act as a cytoprotective agent. esRAGE is secreted from the cells and is a spliced variant of RAGE. The sRAGE on the other hand is proteolytically cleaved from cell surface receptor via matrix metalloproteinase (MMPs). sRAGE is elevated in type 1 and type 2 diabetes and in patients with decreased renal function. Serum levels of sRAGE are reduced in diseases including coronary artery disease, atherosclerosis, essential hypertension, chronic obstructive lung disease, heart failure, and hypercholesterolemia. Serum levels of AGEs are elevated in patients with coronary artery disease and atherosclerosis. However, the increases in serum AGEs are very high in patients with diabetes and renal disease. There is a positive correlation between serum levels of AGEs and RAGE and sRAGE. The elevated levels of sRAGE in patients with diabetes and impaired renal function may be due to increased levels of MMPs. AGEs increase in the expression and production of MMPs, which would increase the cleavage of sRAGE from cell surface. In conclusion, low level of serum sRAGE is a good biomarker for disease other than diabetes and renal disease. A unified formula that takes into consideration of AGEs, sRAGE, and esRAGE such as AGE/sRAGE or AGEs/esRAGE would be better biomarker than sRAGE or esRAGE for all AGE-RAGE-associated diseases including diabetes and renal disease.
Collapse
Affiliation(s)
- Kailash Prasad
- Department of Physiology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| |
Collapse
|
58
|
Davis KE, Prasad C, Vijayagopal P, Juma S, Imrhan V. Serum soluble receptor for advanced glycation end products correlates inversely with measures of adiposity in young adults. Nutr Res 2014; 34:478-85. [DOI: 10.1016/j.nutres.2014.04.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/16/2014] [Accepted: 04/17/2014] [Indexed: 12/13/2022]
|
59
|
He L, Bao H, Xue J, Zheng L, Zhang Q, Sun L, Pan H. Circulating soluble advanced glycation end product is inversely associated with the significant risk of developing cancer: evidence from a meta-analysis. Tumour Biol 2014; 35:8749-55. [PMID: 24874049 DOI: 10.1007/s13277-014-2122-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 05/20/2014] [Indexed: 12/30/2022] Open
Abstract
Currently, advanced glycation end product (RAGE) is receiving much attention in carcinogenesis research due to its involvement in cancer progression and metastasis. We therefore sought to examine the association of circulating soluble RAGE (sRAGE) with all types of cancer by a meta-analysis. The PubMed and EMBASE databases were searched before March 1, 2014. Data and study quality were assessed in duplicate. Effect estimates were expressed as weighted mean difference (WMD) and its 95 % confidence interval (CI). Altogether, nine eligible articles including 1,337 cancer patients and 1,839 controls were analyzed. The overall analysis indicated that circulating sRAGE was remarkably reduced by 222.07 pg/ml in cancer patients compared with controls (95 % CI: -373.77 to -70.37; P = 0.004), with heterogeneity and without publication bias. In subgroup analyses, this reduction was weakened yet still significant in prospective studies (WMD = -87.62; 95 % CI: -138.60 to -36.63; P = 0.001) with improved heterogeneity (I (2) = 56.5 %; P = 0.056). Restricting analyses to the large studies (total number of subjects ≥200) identified significant reduction of circulating sRAGE in cancer patients relative to controls (WMD = -231.34; 95 % CI: -450.10 to -12.58; P = 0.038). Further meta-regression analysis showed that smoking status explained some part of heterogeneity for the association of circulating sRAGE with cancer risk (regression coefficient: -67.02; P = 0.046). Our findings demonstrate a protective role of circulating sRAGE in the development of cancer, especially in patients without diabetes mellitus or with normal renal function.
Collapse
Affiliation(s)
- Lan He
- Basic Medical Science College, Qiqihar Medical University, Bukui North Street 333, Jianhua District, Qiqihar, 161006, Heilongjiang, China
| | | | | | | | | | | | | |
Collapse
|
60
|
Momma H, Niu K, Kobayashi Y, Huang C, Chujo M, Otomo A, Tadaura H, Miyata T, Nagatomi R. Higher serum soluble receptor for advanced glycation end product levels and lower prevalence of metabolic syndrome among Japanese adult men: a cross-sectional study. Diabetol Metab Syndr 2014; 6:33. [PMID: 24602408 PMCID: PMC4016590 DOI: 10.1186/1758-5996-6-33] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 02/13/2014] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Although several studies showed that decreased soluble receptor for advanced glycation end products (sRAGE) is associated with metabolic syndrome (MetS), inflammation level has not been considered, even though ligand-RAGE interaction induces inflammation. The objective of the study was to determine the association between sRAGE and MetS among Japanese adult in a cross-sectional survey, taking the level of low grade inflammation into consideration. METHODS Serum soluble RAGE (sRAGE) were measured in 712 men and 176 women aged 30-83 years with serum C-reactive protein (hsCRP) concentration below 3 mg/L. MetS was defined using the criteria of the American Heart Association Scientific Statements of 2009. RESULTS After multivariable adjustment, among men, higher sRAGE levels were associated with lower odds of MetS as well as central obesity and elevated blood pressure. Comparing the extreme tertiles of sRAGE, odds ratios (95% confidence interval) were 0.58 (0.36-0.95; P for trend = 0.001) for MetS; 0.41 (0.25-0.52; P for trend < 0.001) for central obesity; and 0.45 (0.29-0.70; P for trend < 0.001) for elevated blood pressure. Moreover, participants were categorized according to their median hsCRP and sRAGE values. Men in the higher hsCRP/higher sRAGE category had a 40% lower odds ratio for MetS than those in the higher hsCRP/lower sRAGE category (P = 0.031). Among women, there was no association between sRAGE levels and the prevalence of MetS. CONCLUSIONS Higher circulating RAGE concentrations were associated with lower prevalence of MetS and its components among Japanese men.
Collapse
Affiliation(s)
- Haruki Momma
- Division of Biomedical Engineering for Health & Welfare, Tohoku University Graduate School of Biomedical Engineering, 2-1 Seiryo-machi, Aoba-ku 980-8575 Sendai, Japan
| | - Kaijun Niu
- Department of Epidemiology, School of Public Health, Tianjin Medical University, Tianjin 300070, People’s Republic of China
| | - Yoritoshi Kobayashi
- Department of Medicine and Science in Sports and Exercise, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | - Cong Huang
- Department of Medicine and Science in Sports and Exercise, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | - Masahiko Chujo
- Department of Medicine and Science in Sports and Exercise, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | - Atsushi Otomo
- Department of Medicine and Science in Sports and Exercise, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | | | - Toshio Miyata
- United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| | - Ryoichi Nagatomi
- Division of Biomedical Engineering for Health & Welfare, Tohoku University Graduate School of Biomedical Engineering, 2-1 Seiryo-machi, Aoba-ku 980-8575 Sendai, Japan
- Department of Medicine and Science in Sports and Exercise, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
| |
Collapse
|
61
|
Nakamura I, Oyama JI, Komoda H, Shiraki A, Sakamoto Y, Taguchi I, Hiwatashi A, Komatsu A, Takeuchi M, Yamagishi SI, Inoue T, Node K. Possible effects of glimepiride beyond glycemic control in patients with type 2 diabetes: a preliminary report. Cardiovasc Diabetol 2014; 13:15. [PMID: 24423092 PMCID: PMC3909938 DOI: 10.1186/1475-2840-13-15] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 01/02/2014] [Indexed: 01/10/2023] Open
Abstract
Background The purpose of this study was to elucidate the effects of glimepiride on the levels of biomarkers related to cardiovascular regulation in patients with type 2 diabetes mellitus. Methods and results Thirty-four patients with type 2 diabetes received glimepiride for 24 weeks. Significant decreases in the levels of glyceraldehyde-derived advanced glycation end products, (glycer-AGE: toxic AGE), eotaxin and fibroblast growth factor (FGF)-2 were recognized after the administration of glimepiride. Moreover, there were trends for there to be increases in the levels of granulocyte-colony stimulating factor (G-CSF) and granulocyte macrophage-colony stimulating factor (GM-CSF), and decreases in the levels of fractalkine, soluble CD40 ligand (sCD40L), macrophage inflammatory protein (MIP)-β, vascular endothelial growth factor (VEGF) and soluble receptor for AGE (sRAGE). Conclusions Glimepiride may have potent anti-oxidative, anti-inflammatory and angiogenic properties and it may potentially repair tissue damage by decreasing the levels of toxic AGE and increasing colony-stimulating factors.
Collapse
Affiliation(s)
| | - Jun-ichi Oyama
- Department of Cardiovascular Medicine, Saga University, Saga 849-8501, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
62
|
Bhatwadekar A, Stitt AW. AGE and RAGE inhibitors in the treatment of diabetic retinopathy. EXPERT REVIEW OF OPHTHALMOLOGY 2014. [DOI: 10.1586/17469899.2.1.105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
63
|
sRAGE is associated with low waist circumference and Hb levels in NAFLD. Open Med (Wars) 2013. [DOI: 10.2478/s11536-013-0224-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractAdvanced glycation end products (AGEs) and the receptor RAGE interaction is involved in nonalcoholic fatty liver disease (NAFLD). Although exogenously administered soluble RAGE (sRAGE) has been shown to block the harmful effects of AGEs in animal models, there is still controversy about the role of sRAGE in humans. We examined here which anthropometric, metabolic and clinical variables were independent correlates of sRAGE levels in NAFLD patients. The study involved 77 biopsy-proven, unmedictaed NAFLD patients (44 male and 33 female) with a mean age of 43.4±13.0 years old. We examined which anthropometric, metabolic and clinical variables, including liver steatosis and fibrosis markers, are independently associated with serum levels of sRAGE. Mean serum levels of sRAGE were 710.7±290.2 pg/mL. Univariate analysis revealed that waist circumference (inversely), hemoglobin (inversely), number of white blood cells (inversely), total-bilirubin (inversely), free fatty acid (inversely), ferritin (inversely), and HbA1c (inversely) were significantly correlated with serum levels of sRAGE. In multiple stepwise regression analysis, waist circumference (p<0.01, inversely) and hemoglobin (p<0.01, inversely) were independently associated with serum levels of sRAGE (R2=0.176). The present study reveals that low serum levels of sRAGE are independently associated with waist circumference and hemoglobin in patients with NAFLD.
Collapse
|
64
|
Jules J, Maiguel D, Hudson BI. Alternative splicing of the RAGE cytoplasmic domain regulates cell signaling and function. PLoS One 2013; 8:e78267. [PMID: 24260107 PMCID: PMC3832623 DOI: 10.1371/journal.pone.0078267] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 09/09/2013] [Indexed: 12/15/2022] Open
Abstract
The Receptor for Advanced Glycation End-products (RAGE) is a multi-ligand receptor present on most cell types. Upregulation of RAGE is seen in a number of pathological states including, inflammatory and vascular disease, dementia, diabetes and various cancers. We previously demonstrated that alternative splicing of the RAGE gene is an important mechanism which regulates RAGE signaling through the production of soluble ligand decoy isoforms. However, no studies have identified any alternative splice variants within the intracellular region of RAGE, a region critical for RAGE signaling. Herein, we have cloned and characterized a novel splice variant of RAGE that has a truncated intracellular domain (RAGEΔICD). RAGEΔICD is prevalent in both human and mouse tissues including lung, brain, heart and kidney. Expression of RAGEΔICD in C6 glioma cells impaired RAGE-ligand induced signaling through various MAP kinase pathways including ERK1/2, p38 and SAPK/JNK. Moreover, RAGEΔICD significantly affected tumor cell properties through altering cell migration, invasion, adhesion and viability in C6 glioma cells. Furthermore, C6 glioma cells expressing RAGEΔICD exhibited drastic inhibition on tumorigenesis in soft agar assays. Taken together, these data indicate that RAGEΔICD represents a novel endogenous mechanism to regulate RAGE signaling. Significantly, RAGEΔICD could play an important role in RAGE related disease states through down regulation of RAGE signaling.
Collapse
Affiliation(s)
- Joel Jules
- Division of Endocrinology, Diabetes & Metabolism, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, United States of America
| | - Dony Maiguel
- Division of Nephrology and Hypertension, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, United States of America
| | - Barry I. Hudson
- Division of Endocrinology, Diabetes & Metabolism, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, United States of America
- * E-mail:
| |
Collapse
|
65
|
Zhang Q, Li G, Liu T. Receptor for advanced glycation end products (RAGE): Novel biomarker and therapeutic target for atrial fibrillation. Int J Cardiol 2013; 168:4802-4. [PMID: 23886524 DOI: 10.1016/j.ijcard.2013.07.038] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Accepted: 07/01/2013] [Indexed: 10/26/2022]
|
66
|
Ishibashi Y, Matsui T, Maeda S, Higashimoto Y, Yamagishi SI. Advanced glycation end products evoke endothelial cell damage by stimulating soluble dipeptidyl peptidase-4 production and its interaction with mannose 6-phosphate/insulin-like growth factor II receptor. Cardiovasc Diabetol 2013; 12:125. [PMID: 23984879 PMCID: PMC3765742 DOI: 10.1186/1475-2840-12-125] [Citation(s) in RCA: 127] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 08/27/2013] [Indexed: 02/07/2023] Open
Abstract
Background Advanced glycation end products (AGEs) and receptor RAGE interaction play a role in diabetic vascular complications. Inhibition of dipeptidyl peptidase-4 (DPP-4) is a potential therapeutic target for type 2 diabetes. However, the role of DPP-4 in AGE-induced endothelial cell (EC) damage remains unclear. Methods In this study, we investigated the effects of DPP-4 on reactive oxygen species (ROS) generation and RAGE gene expression in ECs. We further examined whether an inhibitor of DPP-4, linagliptin inhibited AGE-induced soluble DPP-4 production, ROS generation, RAGE, intercellular adhesion molecule-1 (ICAM-1) and plasminogen activator inhibitor-1 (PAI-1) gene expression in ECs. Results DPP-4 dose-dependently increased ROS generation and RAGE gene expression in ECs, which were prevented by linagliptin. Mannose 6-phosphate (M6P) and antibodies (Ab) raised against M6P/insulin-like growth factor II receptor (M6P/IGF-IIR) completely blocked the ROS generation in DPP-4-exposed ECs, whereas surface plasmon resonance revealed that DPP-4 bound to M6P/IGF-IIR at the dissociation constant of 3.59 x 10-5 M. AGEs or hydrogen peroxide increased soluble DPP-4 production by ECs, which was prevented by N-acetylcysteine, RAGE-Ab or linagliptin. Linagliptin significantly inhibited the AGE-induced ROS generation, RAGE, ICAM-1 and PAI-1 gene expression in ECs. Conclusions The present study suggests that AGE-RAGE-induced ROS generation stimulates the release of DPP-4 from ECs, which could in turn act on ECs directly via the interaction with M6P/IGF-IIR, further potentiating the deleterious effects of AGEs. The blockade by linagliptin of positive feedback loop between AGE-RAGE axis and DPP-4 might be a novel therapeutic target for vascular injury in diabetes.
Collapse
Affiliation(s)
- Yuji Ishibashi
- Department of Pathophysiology and Therapeutics of Diabetic Vascular Complications, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan.
| | | | | | | | | |
Collapse
|
67
|
Kotani K, Caccavello R, Taniguchi N, Gugliucci A. Circulating soluble receptor for advanced glycation end products is inversely correlated to oxidized low-density lipoproteins in asymptomatic subjects. J Int Med Res 2013. [PMID: 23206470 DOI: 10.1177/030006051204000527] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVE There is growing evidence that circulating soluble receptor for advanced glycation end products (sRAGE) exerts antiatherogenic effects as a decoy receptor that abolishes RAGE signalling. A previous study reported that oxidized low-density lipoprotein (oxLDL) can be one of the RAGE ligands. The present cross-sectional study investigated the clinical association between sRAGE and oxLDL in humans. METHODS Serum levels of the conventional atherosclerotic risk factors, sRAGE and malondialdehyde-modified low-density lipoprotein (MDA-LDL) were analysed in asymptomatic subjects; MDA-LDL was measured as a biomarker of oxLDL. RESULTS Mean serum levels of sRAGE and MDA-LDL were 1101 ng/l and 57.6 IU/l, respectively, in 33 subjects of mean age 65 years. Simple linear regression analysis showed a significant inverse correlation between sRAGE and MDA-LDL. Stepwise multiple linear regression analysis confirmed MDA-LDL to be independently, significantly and inversely correlated with sRAGE. CONCLUSIONS An independent, significant and inverse correlation was shown to exist between circulating levels of sRAGE and oxLDL (MDA-LDL), which suggests that part of the antiatherosclerotic effects of sRAGE may be related to oxLDL quenching.
Collapse
Affiliation(s)
- K Kotani
- Department of Clinical Laboratory Medicine, Jichi Medical University, Tochigi, Japan.
| | | | | | | |
Collapse
|
68
|
Sukkar MB, Ullah MA, Gan WJ, Wark PAB, Chung KF, Hughes JM, Armour CL, Phipps S. RAGE: a new frontier in chronic airways disease. Br J Pharmacol 2012; 167:1161-76. [PMID: 22506507 PMCID: PMC3504985 DOI: 10.1111/j.1476-5381.2012.01984.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 02/13/2012] [Accepted: 02/22/2012] [Indexed: 12/21/2022] Open
Abstract
Asthma and chronic obstructive pulmonary disease (COPD) are heterogeneous inflammatory disorders of the respiratory tract characterized by airflow obstruction. It is now clear that the environmental factors that drive airway pathology in asthma and COPD, including allergens, viruses, ozone and cigarette smoke, activate innate immune receptors known as pattern-recognition receptors, either directly or indirectly by causing the release of endogenous ligands. Thus, there is now intense research activity focused around understanding the mechanisms by which pattern-recognition receptors sustain the airway inflammatory response, and how these mechanisms might be targeted therapeutically. One pattern-recognition receptor that has recently come to attention in chronic airways disease is the receptor for advanced glycation end products (RAGE). RAGE is a member of the immunoglobulin superfamily of cell surface receptors that recognizes pathogen- and host-derived endogenous ligands to initiate the immune response to tissue injury, infection and inflammation. Although the role of RAGE in lung physiology and pathophysiology is not well understood, recent genome-wide association studies have linked RAGE gene polymorphisms with airflow obstruction. In addition, accumulating data from animal and clinical investigations reveal increased expression of RAGE and its ligands, together with reduced expression of soluble RAGE, an endogenous inhibitor of RAGE signalling, in chronic airways disease. In this review, we discuss recent studies of the ligand-RAGE axis in asthma and COPD, highlight important areas for future research and discuss how this axis might potentially be harnessed for therapeutic benefit in these conditions.
Collapse
Affiliation(s)
- Maria B Sukkar
- School of Pharmacy, The University of Technology SydneyNSW, Australia
- Woolcock Institute of Medical Research, Sydney Medical School, The University of SydneyNSW, Australia
| | - Md Ashik Ullah
- Woolcock Institute of Medical Research, Sydney Medical School, The University of SydneyNSW, Australia
- School of Biomedical Sciences and Australian Infectious Diseases Research Centre, The University of QueenslandQld, Australia
| | - Wan Jun Gan
- School of Biomedical Sciences and Australian Infectious Diseases Research Centre, The University of QueenslandQld, Australia
| | - Peter AB Wark
- Centre for Asthma and Respiratory Disease, Hunter Medical Research Institute, University of NewcastleNSW, Australia
- Department of Respiratory and Sleep Medicine, John Hunter HospitalNSW, Australia
| | - Kian Fan Chung
- Airways Disease Section, National Heart and Lung Institute, Imperial College LondonLondon, UK
| | | | - Carol L Armour
- Woolcock Institute of Medical Research, Sydney Medical School, The University of SydneyNSW, Australia
| | - Simon Phipps
- School of Biomedical Sciences and Australian Infectious Diseases Research Centre, The University of QueenslandQld, Australia
| |
Collapse
|
69
|
McNair ED, Wells CR, Qureshi AM, Basran RS, Pearce C, Orvold J, Devilliers J, Prasad K. Low levels of soluble receptor for advanced glycation end products in non-ST elevation myocardial infarction patients. Int J Angiol 2012; 18:187-92. [PMID: 22477551 DOI: 10.1055/s-0031-1278352] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Interaction of the receptors for advanced glycation end products (RAGEs) with advanced glycation end products (AGEs) results in expression of inflammatory mediators (tumor necrosis factor-alpha [TNF-α] and soluble vascular cell adhesion molecule-1 [sVCAM-1]), activation of nuclear factor-kappa B and induction of oxidative stress - all of which have been implicated in atherosclerosis. Soluble RAGE (sRAGE) acts as a decoy for the RAGE ligand and is protective against atherosclerosis. OBJECTIVES To determine whether levels of serum sRAGE are lower, and whether levels of serum AGEs, TNF-α and sVCAM-1 are higher in non-ST elevation myocardial infarction (NSTEMI) patients than in healthy control subjects; and whether sRAGE or the ratio of AGEs to sRAGE (AGEs/sRAGE) is a predictor/biomarker of NSTEMI. METHODS Serum levels of sRAGE, AGEs, TNF-α and sVCAM-1 were measured in 46 men with NSTEMI and 28 age- and sex-matched control subjects. Angiography was performed in the NSTEMI patients. RESULTS sRAGE levels were lower, and levels of AGEs, TNF-α, sVCAM-1 and AGEs/sRAGE were higher in NSTEMI patients than in control subjects. sRAGE levels were negatively correlated with the number of diseased coronary vessels, serum AGEs, AGEs/sRAGE, TNF-α and sVCAM-1. The sensitivity of the AGEs/sRAGE test is greater than that of the sRAGE test, while the specificity and predictive values of the sRAGE test are greater than those of the AGEs/sRAGE test for identifying NSTEMI patients. CONCLUSIONS Serum levels of sRAGE were low in NSTEMI patients, and were negatively correlated with extent of lesion, inflammatory mediators, AGEs and AGEs/sRAGE. Both sRAGE and AGEs/sRAGE may serve as biomarkers/predictors for identifying NSTEMI patients.
Collapse
|
70
|
Gopal P, Rutten EPA, Dentener MA, Wouters EFM, Reynaert NL. Decreased plasma sRAGE levels in COPD: influence of oxygen therapy. Eur J Clin Invest 2012; 42:807-14. [PMID: 22288943 DOI: 10.1111/j.1365-2362.2012.02646.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Chronic obstructive pulmonary disease (COPD) is associated with systemic inflammation and oxidative stress. N(ε) -(carboxymethyl) lysine (CML), an advanced glycation end product (AGE) and the soluble decoy receptor, sRAGE, are exciting new molecules linked to oxidative stress and inflammation. Here the levels of plasma sRAGE and CML were determined and their variation in relation to lung function, external long-term oxygen therapy (LTOT) and plasma levels of inflammatory molecules in COPD evaluated. METHODS Plasma sRAGE and CML levels were measured by ELISA in 146 patients with stable COPD and 81 healthy subjects, subgrouped from a larger case-control study and matched for age, gender and pack-years smoked. RESULTS Decreased levels of plasma sRAGE and no significant difference in levels of plasma CML were found in patients with COPD in comparison with controls. In the total group, plasma sRAGE was positively associated with FEV(1) and forced vital capacity and negatively with pack-years smoked. In patients receiving LTOT, levels of plasma sRAGE were lower compared with those without LTOT. Only in controls, a weak correlation was found between plasma sRAGE and CML. sRAGE did not correlate with measured inflammatory markers, whereas CML was negatively correlated with fibrinogen. CONCLUSION Plasma sRAGE levels are lower in patients with COPD compared with healthy control subjects, and even lower levels in patients receiving LTOT. Because sRAGE correlated with lung function only in the whole group, sRAGE can be considered a marker of COPD, but not of disease severity. A lack of clear association between sRAGE, CML and systemic inflammation is furthermore evident.
Collapse
Affiliation(s)
- Poornima Gopal
- Department of Respiratory Medicine, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands
| | | | | | | | | |
Collapse
|
71
|
Kerkeni M, Saïdi A, Bouzidi H, Ben Yahya S, Hammami M. Elevated serum levels of AGEs, sRAGE, and pentosidine in Tunisian patients with severity of diabetic retinopathy. Microvasc Res 2012; 84:378-83. [PMID: 22835520 DOI: 10.1016/j.mvr.2012.07.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Revised: 07/11/2012] [Accepted: 07/17/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES The advanced glycation end products (AGEs)-receptor for AGE (RAGE) axis activity are implicated in diabetic vascular complications. We measured serum AGE, sRAGE and pentosidine levels in Tunisian patients with diabetic retinopathy (DR) and examined whether these biomarkers are related to the severity of DR. DESIGN AND METHODS We included 30 healthy control subjects and 100 diabetic patients were divided into 2 subgroups: 40 patients with nonproliferative diabetic retinopathy (NPDR), and 60 patients with proliferative diabetic retinopathy (PRD). AGEs, sRAGE and pentosidine were measured in serum by ELISA. RESULTS Serum levels of AGEs, sRAGE and pentosidine were significantly increased in patients with diabetes mellitus compared to nondiabetic controls (P<.01, P<.001, P<.001 respectively). In diabetic patients, serum AGEs, sRAGE and pentosidine levels were significantly higher in patients who had PDR than in those with NPDR (P=.001, P=.01, P=.005 respectively). Furthermore, in stepwise multivariate regression analysis, the levels of pentosidine and duration of diabetes were independently associated with severity of DR. CONCLUSION Serum AGEs, sRAGE, and pentosidine levels are related with the presence of DR. Duration of diabetes and pentosidine were independently correlated with the severity of DR.
Collapse
Affiliation(s)
- Mohsen Kerkeni
- Laboratory of Biochemistry, UR: Human Nutrition & Metabolic Disorders, Faculty of Medicine, Monastir University, Tunisia.
| | | | | | | | | |
Collapse
|
72
|
Brix JM, Höllerl F, Kopp HP, Schernthaner GH, Schernthaner G. The soluble form of the receptor of advanced glycation endproducts increases after bariatric surgery in morbid obesity. Int J Obes (Lond) 2012; 36:1412-7. [PMID: 22828946 DOI: 10.1038/ijo.2012.107] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE The increased cardiovascular (CV) disease risk in patients with morbid obesity (MO) cannot be fully explained by traditional CV risk factors. Activation of the receptor of Advanced Glycation Endproducts (RAGE) leads to inflammation via the NF κβ (nuclear factor κβ) pathway. The soluble form of RAGE (sRAGE), which is present in plasma, can bind to ligands of RAGE and avoids interaction of RAGE with proinflammatory ligands. We investigated sRAGE levels in patients with MO and compared them with healthy lean controls (CO), before and after bariatric surgery. DESIGN We conducted a cross-sectional study and a 24-month longitudinal study. SUBJECTS We included 85 patients (mean age: 41 ± 12 years; mean body mass index (BMI): 45.4 ± 7.9 kg m(-2)) with MO in comparison with 40 CO (mean age: 42 ± 13 years; mean BMI: 26.0 ± 5.5 kg m(-2)). All patients were investigated before and 2 years after bariatric surgery. Apart from weight and CV risk markers (blood pressure, lipids), a glucose tolerance test (75 g), renal and inflammation parameters were assessed. sRAGE levels were assessed by a commercial ELISA. To investigate the associations of the observed reductions of values, delta (Δ) of parameters were calculated. RESULTS Patients with MO had significant lower sRAGE levels than CO: 1010 ± 514 vs 1501 ± 674 pg ml(-1); P<0.001. In the longitudinal study, sRAGE levels increased significantly after bariatric surgery from 1010 ± 514 to 1261 ± 710 pg ml(-1); P=0.008. In the correlation analysis, ΔsRAGE levels were associated with Δ1-h and Δ2-h postprandial glucose, Δfasting insulin, Δ2-h postprandial insulin, ΔHOMA (homeostatic model assessment)-insulin resistance (ΔHOMA-IR), Δγ-glutamyl transferase and Δtriglycerides. In a multivariate model, Δ1-h and Δ2-h postprandial glucose, Δ2-h postprandial insulin and ΔHOMA-IR predicted ΔsRAGE. CONCLUSION Patients with MO have significantly lower sRAGE levels compared with non-obese CO, but sRAGE levels increase significantly after weight loss induced by bariatric surgery. As high sRAGE levels inhibit the activation of inflammatory pathways, our results might help understand the beneficial effects of bariatric surgery regarding CV morbidity and mortality.
Collapse
Affiliation(s)
- J M Brix
- Department of Medicine I, Rudolfstiftung Hospital, Vienna, Austria
| | | | | | | | | |
Collapse
|
73
|
Takeuchi M. [Participation of toxic AGEs (TAGE) in a variety of diseases]. Nihon Yakurigaku Zasshi 2012; 139:193-7. [PMID: 22687870 DOI: 10.1254/fpj.139.193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
74
|
Narvaez-Rivera RM, Rendon A, Salinas-Carmona MC, Rosas-Taraco AG. Soluble RAGE as a severity marker in community acquired pneumonia associated sepsis. BMC Infect Dis 2012; 12:15. [PMID: 22264245 PMCID: PMC3274434 DOI: 10.1186/1471-2334-12-15] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Accepted: 01/20/2012] [Indexed: 11/10/2022] Open
Abstract
Background Community-acquired pneumonia (CAP) is considered the most important cause of death from infectious disease in developed countries. Severity assessment scores partially address the difficulties in identifying high-risk patients. A lack of specific and valid pathophysiologic severity markers affect early and effective sepsis therapy. HMGB-1, sRAGE and RAGE have been involved in sepsis and their potential as severity markers has been proposed. The aim of this study was to evaluate HMGB-1, RAGE and sRAGE levels in patients with CAP-associated sepsis and determine their possible association with clinical outcome. Method We evaluated 33 patients with CAP-associated sepsis admitted to the emergency room and followed in the medical wards. Severity assessment scores (CURB-65, PSI, APACHE II, SOFA) and serologic markers (HMGB-1, RAGE, sRAGE) were evaluated on admission. Results Thirty patients with a diagnosis of CAP-associated sepsis were enrolled in the study within 24 hours after admission. Fourteen (46.6%) had pandemic (H1N1) influenza A virus, 2 (6.6%) had seasonal influenza A and 14 other diagnoses. Of the patients in the study group, 16 (53.3%) had a fatal outcome. ARDS was observed in 17 (56.6%) and a total of 22 patients had severe sepsis on admission (73%). The SOFA score showed the greatest difference between surviving and non-surviving groups (P = .003) with similar results in ARDS patients (P = .005). sRAGE levels tended to be higher in non-surviving (P = .058) and ARDS patients (P = .058). Logistic regression modeling demonstrated that SOFA (P = .013) and sRAGE (P = .05) were the only variables that modified the probability of a fatal outcome. Conclusion The association of elevated sRAGE with a fatal outcome suggests that it may have an independent causal effect in CAP. SOFA scores were the only clinical factor with the ability to identify surviving and ARDS patients.
Collapse
Affiliation(s)
- Rodrigo M Narvaez-Rivera
- Department of Immunology, Universidad Autonoma de Nuevo Leon, UANL, School of Medicine and University Hospital, Monterrey Nuevo Leon, Mexico
| | | | | | | |
Collapse
|
75
|
Jeong SJ, Kim CO, Song YG, Baek JH, Kim SB, Jin SJ, Ku NS, Han SH, Choi JY, Lee HC, Kim JM. Low plasma levels of the soluble receptor for advanced glycation end products in HIV-infected patients with subclinical carotid atherosclerosis receiving combined antiretroviral therapy. Atherosclerosis 2011; 219:778-83. [PMID: 21872861 DOI: 10.1016/j.atherosclerosis.2011.08.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 07/11/2011] [Accepted: 08/03/2011] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Combined antiretroviral therapy (cART) has significantly improved the survival rate and quality of life for HIV-infected subjects, but it contributes to the development of metabolic complications including coronary artery disease (CAD). Recent studies have reported that high plasma levels of the soluble receptor for advanced glycation end products (sRAGE) were associated with a lower incidence of CAD in non-HIV infected patients. However, there has been no report of an association of sRAGE and subclinical carotid atherosclerosis in HIV-infected patients receiving cART. METHODS We examined the association of circulating sRAGE in HIV-infected patients with carotid intima-media thickness (IMT) and other metabolic variables. We prospectively enrolled 76 HIV-infected patients receiving cART for ≥ 6 months. RESULTS sRAGE had a significantly negative correlation with body mass index (r = -0.324, p = 0.005), waist-to-hip ratio (r = -0.335, p = 0.003), systolic blood pressure (BP) (r=-0.359, p=0.002), diastolic BP (r = -0.343, p = 0.004), total cholesterol (r = -0.240, p = 0.037), low-density lipoprotein-cholesterol (r=-0.284, p=0.024), log(homeostasis model assessment of insulin resistance [HOMA-IR]) (r = -0.380, p = 0.002) and carotid IMT including max-IMT and mean-IMT (r = -0.358, p = 0.001 and r = -0.329, p = 0.004, respectively). By the use of multiple stepwise regression analyses, systolic BP (p=0.001) and log[HOMA-IR] (p = 0.001) remained significant independently. CONCLUSIONS These results suggest that sRAGE may have a protective effect against subclinical atherosclerosis by preventing inflammatory responses mediated by the activation of cell surface RAGE in HIV-infected patients receiving cART.
Collapse
Affiliation(s)
- Su Jin Jeong
- Department of Internal Medicine and AIDS Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
76
|
Raposeiras-Roubín S, Rodiño-Janeiro BK, Grigorian-Shamagian L, Seoane-Blanco A, Moure-González M, Varela-Román A, Álvarez E, González-Juanatey JR. Evidence for a role of advanced glycation end products in atrial fibrillation. Int J Cardiol 2011; 157:397-402. [PMID: 21652096 DOI: 10.1016/j.ijcard.2011.05.072] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 02/28/2011] [Accepted: 05/13/2011] [Indexed: 01/29/2023]
Abstract
BACKGROUND Recent studies suggested that advanced glycation end-products (AGEs) and their receptor (RAGE) interaction may be promoted by inflammation and oxidative stress. These processes could also contribute to the pathogenesis of atrial fibrillation (AF), but their roles remain poorly defined. We studied the association of AGE-RAGE axis with AF in diabetic and non-diabetic patients, since the axis appears to play a key role in the process. METHODS Ninety-seven consecutive outpatients were included in this transversal study. Fifty-nine patients were in sinus rhythm (SR) and 38 in permanent AF. Plasma fluorescent AGEs and soluble RAGE (sRAGE) were measured and comparisons between patients with and without AF were performed. A multivariate logistic regression analysis was made to define the independent factors associated with AF. RESULTS Fluorescent AGEs and sRAGE were higher in AF group (74.9 ± 25.6 vs. 61.8 ± 20.1a.u. for fluorescent AGEs, p=0.006; 1714.2 ± 1105.5 vs. 996.1 ± 820.7 pg/mL for sRAGE, p=0.001). These differences were specially marked in non-diabetic patients. Both AGEs and sRAGE directly correlated with left atrial dimensions (r=0.496; r=0.536 for atrial area and r=0.491; r=0.511 for atrial volume, for fluorescent AGEs and sRAGE, respectively, p<0.001). In a multivariate analysis, fluorescent AGEs and sRAGE resulted as markers of AF independent of left atrial distension, diabetes and other confounding variables. CONCLUSIONS AGEs and sRAGE plasma levels were higher in patients with AF, independently of diabetes mellitus, and they positively correlated with atrial dimensions, indicating a role for the AGE-RAGE axis in the arrhythmogenic structural atrial remodelling.
Collapse
|
77
|
Jiao L, Weinstein SJ, Albanes D, Taylor PR, Graubard BI, Virtamo J, Stolzenberg-Solomon RZ. Evidence that serum levels of the soluble receptor for advanced glycation end products are inversely associated with pancreatic cancer risk: a prospective study. Cancer Res 2011; 71:3582-9. [PMID: 21540233 PMCID: PMC3096705 DOI: 10.1158/0008-5472.can-10-2573] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cigarette smoking, obesity, type 2 diabetes, and, to a lesser extent, meat cooked at high temperatures are associated with pancreatic cancer. Cigarette smoke and foods cooked at higher temperatures are major environmental sources of advanced glycation end products (AGE). AGEs accumulate during hyperglycemia and elicit oxidative stress and inflammation through interaction with the receptor for AGEs (RAGE). Soluble RAGE (sRAGE) acts as an anti-inflammatory factor to neutralize AGEs and block the effects mediated by RAGE. In this study, we investigated the associations of prediagnostic measures of N(ε)-(carboxymethyl)-lysine (CML)-AGE and sRAGE with pancreatic cancer in a case-cohort study within a cohort of 29,133 Finnish male smokers. Serum samples and exposure information were collected at baseline (1985-1988). We measured CML-AGE, sRAGE, glucose, and insulin concentrations in fasting serum from 255 incident pancreatic cancer cases that arose through April 2005 and from 485 randomly sampled subcohort participants. Weighted Cox proportional hazard regression models were used to calculate relative risks (RR) and 95% CI, adjusted for age, years of smoking, and body mass index. CML-AGE and sRAGE were mutually adjusted. CML-AGE levels were not associated with pancreatic cancer [fifth compared with first quintile, RR (95% CI): 0.68 (0.38-1.22), P(trend) = 0.27]. In contrast, sRAGE levels were inversely associated with pancreatic cancer [fifth compared with first quintile, RR (95% CI): 0.46 (0.23-0.73), P(trend) = 0.002]. Further adjustment for glucose or insulin levels did not change the observed associations. Our findings suggest that sRAGE is inversely associated with pancreatic cancer risk among Finnish male smokers.
Collapse
Affiliation(s)
- Li Jiao
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA.
| | | | | | | | | | | | | |
Collapse
|
78
|
Jiao L, Taylor PR, Weinstein SJ, Graubard BI, Virtamo J, Albanes D, Stolzenberg-Solomon RZ. Advanced glycation end products, soluble receptor for advanced glycation end products, and risk of colorectal cancer. Cancer Epidemiol Biomarkers Prev 2011; 20:1430-8. [PMID: 21527578 DOI: 10.1158/1055-9965.epi-11-0066] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Advanced glycation end products (AGE) accumulate in human tissue proteins during aging, particularly under hyperglycemia conditions. AGEs induce oxidative stress and inflammation via the receptor for AGEs (RAGE) and soluble RAGE (sRAGE) can neutralize the effects mediated by RAGE-ligand engagement. METHODS We examined the association between N(ε)-(carboxymethyl)lysine (CML), a prominent AGE, and sRAGE and colorectal cancer risk in a prospective case-cohort study nested within a cancer prevention trial among 29,133 Finnish male smokers. Among study subjects who were alive without cancer 5 years after baseline (1985-1988), we identified 483 incident colorectal cancer cases and randomly sampled 485 subcohort participants as the comparison group with the follow-up to April 2006. Baseline serum levels of CML-AGE, sRAGE, glucose and insulin were determined. Weighted Cox proportional hazard regression models were used to calculate relative risks (RR) and 95% CI. RESULTS Comparing highest with lowest quintile of sRAGE, the RR for incident colorectal cancer was 0.65 (95% CI, 0.39-1.07; P(trend) = 0.03), adjusting for age, years of smoking, body mass index, and CML-AGE. Further adjustment for serum glucose strengthened the association (RR = 0.52; 95% CI, 0.30-0.89; P(trend) = 0.009). Highest quintile of CML-AGE was not associated with an increased risk of colorectal cancer (multivariate RR = 1.20; 95% CI, 0.64-2.26). CONCLUSIONS Higher prediagnostic levels of serum sRAGE were associated with lower risk of colorectal cancer in male smokers. IMPACT This is the first epidemiologic study to implicate the receptor for AGEs in colorectal cancer development.
Collapse
Affiliation(s)
- Li Jiao
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Bethesda, Maryland, USA.
| | | | | | | | | | | | | |
Collapse
|
79
|
Nakamura T, Sato E, Fujiwara N, Kawagoe Y, Koide H, Ueda Y, Takeuchi M, Yamagishi SI. Calcium channel blocker inhibition of AGE and RAGE axis limits renal injury in nondiabetic patients with stage I or II chronic kidney disease. Clin Cardiol 2011; 34:372-7. [PMID: 21432860 DOI: 10.1002/clc.20885] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 12/07/2010] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND There is a growing body of evidence that advanced glycation end products (AGE) and their receptor (RAGE) system are implicated in chronic kidney disease (CKD). We have previously found that a long-acting calcium channel blocker, azelnidipine, but not amlodipine, improves renal injury in CKD patients. However, little is known about the effect of azelnidipine on the AGE-RAGE axis in humans. In this study, we examined whether azelnidipine addition could have renoprotective properties in hypertensive CKD patients by reducing serum levels of AGE and soluble form of RAGE (sRAGE). Thirty nondiabetic stage I or II CKD patients who had already been treated with angiotensin II receptor blockers were enrolled in this study. HYPOTHESIS We hypothesized that azelnidipine treatment could limit renal injury partly by blocking the AGE-RAGE axis. METHODS Patients were randomly divided into 2 groups; one group was treated with 16 mg azelnidipine and the other with 5 mg amlodipine once daily. They were followed up for 6 months. RESULTS Proteinuria was positively correlated with circulating AGE and sRAGE levels in our subjects. Both drugs exhibited comparable and significant blood pressure (BP)-lowering effects. Although neither of them affected glucose, glycated hemoglobin, lipid levels, and estimated glomerular filtration rate, treatment with azelnidipine, but not amlodipine, decreased circulating AGE, sRAGE, proteinuria, and urinary levels of liver-type fatty acid binding protein, a marker of tubular injury, in a BP-lowering-independent manner. CONCLUSIONS Our present results suggest that azelnidipine may exert renoprotective properties in nondiabetic hypertensive CKD patients via its unique inhibitory effects on the AGE-RAGE axis.
Collapse
Affiliation(s)
- Tsukasa Nakamura
- Division of Nephrology, Department of Internal Medicine, Shinmatsudo Central General Hospital, Matsudo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
80
|
Raposeiras-Roubín S, Rodiño-Janeiro BK, Grigorian-Shamagian L, Moure-González M, Seoane-Blanco A, Varela-Román A, Almenar-Bonet L, Álvarez E, González-Juanatey JR. Relation of soluble receptor for advanced glycation end products to predict mortality in patients with chronic heart failure independently of Seattle Heart Failure Score. Am J Cardiol 2011; 107:938-44. [PMID: 21247530 DOI: 10.1016/j.amjcard.2010.11.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 11/05/2010] [Accepted: 11/05/2010] [Indexed: 11/26/2022]
Abstract
Knowledge of the role of the soluble receptor for advanced glycation end products (sRAGEs) in chronic heart failure (CHF) is very limited. In the present study, we measured plasma sRAGE levels in patients with CHF and examined whether plasma sRAGE predicts prognosis in patients with HF independently of validated scores as the Seattle Heart Failure Score (SHFS). We measured plasma sRAGE in 106 outpatients with CHF. Patients were prospectively followed during a median follow-up period of 1.3 years with end points of cardiac death or rehospitalization. Plasma sRAGE level increased with advancing New York Heart Association functional class, SHFS, age, and ischemic cause. Plasma sRAGE level was also higher in patients with cardiac death and/or events than in event-free patients. In Cox multivariate proportional hazard analysis, SHFS, sRAGE, and N-terminal pro-B-type natriuretic peptide were independent risk factors for cardiac death (sRAGE hazard ratio 1.26, 95% confidence interval 1.09 to 1.45, p = 0.002) and/or cardiac events (sRAGE hazard ratio 1.07, 95% confidence interval 1.03 to 1.11, p = 0.002). Survival curves adjusted by Cox analysis clearly demonstrated that the high-sRAGE group (higher than median) had a significantly higher incidence of cardiac death than the low-sRAGE group (p = 0.001). In conclusion, sRAGE is a novel, highly sensitive, and specific prognostic marker in current optimally treated patients with CHF with an additive and independent value compared to the multimarker SHFS.
Collapse
|
81
|
Dalal M, Semba RD, Sun K, Crasto C, Varadhan R, Bandinelli S, Fink JC, Guralnik JM, Ferrucci L. Endogenous secretory receptor for advanced glycation end products and chronic kidney disease in the elderly population. Am J Nephrol 2011; 33:313-8. [PMID: 21389696 DOI: 10.1159/000324846] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Accepted: 02/01/2011] [Indexed: 12/28/2022]
Abstract
BACKGROUND/AIMS The relationship of circulating endogenous secretory receptor for advanced glycation end products (esRAGE) and chronic kidney disease (CKD) has not been well characterized. The aim of the study was to determine whether plasma esRAGE is associated with CKD and is predictive of developing CKD in older adults. METHODS The relationship between plasma esRAGE and CKD (more than stage 3 of the National Kidney Foundation classification; estimated glomerular filtration rate <60 ml/min/1.73 m(2)) and CKD over 6 years of follow-up was examined in a cross-sectional and prospective study design in 1,016 men and women, ≥65 years, in the InCHIANTI study, a population-based cohort study of aging in Tuscany, Italy. RESULTS At enrollment, 158 (15.5%) had CKD. Mean (SD) plasma esRAGE was 0.45 (0.24) ng/ml. Plasma esRAGE (ng/ml) was associated with CKD (odds ratio per 1 SD = 1.30; 95% CI 1.1-1.6; p < 0.005) in a multivariable logistic regression model, adjusting for potential confounders. Plasma esRAGE was an independent predictor of incident CKD over 6 years of follow-up (hazard ratio per 1 SD = 1.37; 95% CI 1.1-1.7; p < 0.008) in a multivariable Cox proportional hazards model, adjusting for potential confounders. CONCLUSIONS Elevated plasma esRAGE is independently associated with CKD and is an independent predictor of incident CKD in older community-dwelling adults.
Collapse
Affiliation(s)
- Mansi Dalal
- Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
82
|
Ueda S, Yamagishi SI, Matsui T, Noda Y, Ueda SI, Jinnouchi Y, Sasaki KI, Takeuchi M, Imaizumi T. Serum levels of advanced glycation end products (AGEs) are inversely associated with the number and migratory activity of circulating endothelial progenitor cells in apparently healthy subjects. Cardiovasc Ther 2011; 30:249-54. [PMID: 21884000 DOI: 10.1111/j.1755-5922.2011.00264.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES Endothelial progenitor cells (EPCs) have been shown to participate in the process of vascular repair, thus playing a protective role against cardiovascular disease (CVD). It is known that atherosclerotic risk factors could affect EPC number and function. Advanced glycation end products (AGEs) contribute to the pathogenesis of atherosclerosis as well. However, as far as we know, there is no report to show the relationship between serum AGE levels and circulating EPCs in humans. Therefore, in this study, we investigated whether serum level of AGEs was associated with EPC number and functions in apparently healthy subjects, independent of traditional cardiovascular risk factors. RESEARCH DESIGN AND METHODS Apparently healthy volunteers (34.6 ± 6.9 years old, 40 males and 8 females) who were not on any medications underwent a complete history and physical examination, determination of blood chemistries, including AGEs, and number, differentiation and migratory activity of circulating EPCs. RESULTS Serum AGEs levels were 9.20 ± 1.85 U/mL. Multiple stepwise regression analysis revealed that serum levels of AGEs and smoking were independently correlated with reduced number of EPCs. Further, female, AGEs, and reduced HDL-cholesterol levels were independently associated with impaired migratory activity of circulating EPCs. CONCLUSIONS This study demonstrated for the first time that the serum level of AGEs was one of the independent correlates of decreased cell number and impaired migratory activity of circulating EPCs in apparently healthy subjects. Our present observations suggest that even in young healthy subjects, serum level of AGEs may be a biomarker that could predict the progression of atherosclerosis and future cardiovascular events.
Collapse
Affiliation(s)
- So Ueda
- Department of Internal Medicine, Division of Cardio-Vascular Medicine, Kurume, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
83
|
Hudson BI, Moon YP, Kalea AZ, Khatri M, Marquez C, Schmidt AM, Paik MC, Yoshita M, Sacco RL, DeCarli C, Wright CB, Elkind MSV. Association of serum soluble receptor for advanced glycation end-products with subclinical cerebrovascular disease: the Northern Manhattan Study (NOMAS). Atherosclerosis 2011; 216:192-8. [PMID: 21316677 DOI: 10.1016/j.atherosclerosis.2011.01.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 01/05/2011] [Accepted: 01/06/2011] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Serum levels of the soluble receptor for advanced glycation end-products (sRAGE) have been associated with risk of cardiovascular disease. We hypothesized that sRAGE levels are associated with subclinical cerebrovascular disease in an ethnically diverse population. METHODS Clinically stroke-free participants in the multi-ethnic Northern Manhattan Study (NOMAS) underwent brain MRI to quantify subclinical brain infarcts (SBI) and white matter hyperintensity volume (WMHV) (n = 1102). Serum levels of sRAGE were measured by ELISA. Logistic and multiple linear regression were employed to estimate associations of sRAGE with SBI and WMHV, after adjusting for demographics and vascular risk factors. RESULTS Median sRAGE levels were significantly lower in Hispanics (891.9 pg/ml; n = 708) and non-Hispanic blacks (757.4 pg/ml; n = 197) than in non-Hispanic whites (1120.5 pg/ml; n = 170), and these differences remained after adjusting for other risk factors. Interactions were observed by race-ethnicity between sRAGE levels and MRI measurements, including for SBI in Hispanics (p = 0.04) and WMHV among blacks (p = 0.03). In Hispanics, increasing sRAGE levels were associated with a lower odds of SBI, with those in the upper sRAGE quartile displaying a 50% lower odds of SBI after adjusting for sociodemographic and vascular risk factors (p = 0.05). Among blacks, those in the upper quartile of sRAGE had a similarly reduced increased risk of SBI (p = 0.06) and greater WMHV (p = 0.04). CONCLUSION Compared to whites, Hispanics and blacks have significantly lower sRAGE levels, and these levels were associated with more subclinical brain disease. Taken together, these findings suggest sRAGE levels may be significantly influence by ethnicity. Further studies of sRAGE and stroke risk, particularly in minorities, are warranted.
Collapse
Affiliation(s)
- Barry I Hudson
- Division of Surgical Science, Department of Surgery, College of Physicians and Surgeons, Columbia University, New York, NY, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
84
|
Enhanced expression of receptor for advanced glycation end-products is associated with low circulating soluble isoforms of the receptor in Type 2 diabetes. Clin Sci (Lond) 2011; 120:81-9. [PMID: 20726839 DOI: 10.1042/cs20100256] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The sRAGE [soluble RAGE (receptor for advanced glycation end-products)] lack the transmembrane and cytoplasmic domain of the full-length receptor and can function as a decoy for RAGE ligands. Recent evidence suggests that sRAGE may be a potential biomarker of RAGE-mediated pathology. The present study aimed to examine the relationship between RAGE expression in peripheral blood monocytes and circulating sRAGE and esRAGE (endogenous sRAGE, a splice variant of sRAGE) in Type 2 diabetes. Protein expression of RAGE and esRAGE in monocyte cell lysate was determined by Western blot in 53 diabetic patients and 52 controls. Monocyte cell-surface-bound full-length RAGE expression was measured using flow cytometry. Serum sRAGE, esRAGE and AGE (advanced glycation end products) were assayed by ELISA. The mean HbA1c (glycated haemoglobin) of the diabetic patients was 9.74% and serum AGEs was increased. Monocyte full-length RAGE expression was significantly higher in diabetic patients whereas esRAGE expression was reduced, and serum AGEs concentration was an independent determinant of monocyte cell surface full-length RAGE expression. Serum levels of sRAGE [573.3 (375.7-754.3) compared with 608.1 (405.3-940.8) pg/ml, P<0.05] and esRAGE [241.8 (154.6-356.6) compared with 286.5 (202.6-390.0) pg/ml, P<0.05; values are medians (interquartile range)] were decreased. There was an inverse association between monocyte RAGE expression and log(serum sRAGE) (r=-0.34, P=0.01) but not with esRAGE. In conclusion, despite an increase in full-length RAGE expression, esRAGE expression was down-regulated in the diabetic patients, and serum sRAGE and esRAGE was also reduced. Hence increased full-length RAGE levels are not associated with a similar increase in sRAGE isoforms levels.
Collapse
|
85
|
Creagh-Brown BC, Quinlan GJ, Evans TW, Burke-Gaffney A. The RAGE axis in systemic inflammation, acute lung injury and myocardial dysfunction: an important therapeutic target? Intensive Care Med 2010; 36:1644-1656. [PMID: 20631986 DOI: 10.1007/s00134-010-1952-z] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2010] [Accepted: 05/25/2010] [Indexed: 01/08/2023]
Abstract
BACKGROUND The sepsis syndromes, frequently complicated by pulmonary and cardiac dysfunction, remain a major cause of death amongst the critically ill. Targeted therapies aimed at ameliorating the systemic inflammation that characterises the sepsis syndromes have largely yielded disappointing results in clinical trials. Whilst there are many potential reasons for lack of success of clinical trials, one possibility is that the pathways targeted, to date, are only modifiable very early in the course of the illness. More recent approaches have therefore attempted to identify pathways that could offer a wider therapeutic window, such as the receptor for advanced glycation end-products (RAGE) and its ligands. PURPOSE The objectives of this study were to review the evidence supporting the role of the RAGE axis in systemic inflammation and associated acute lung injury and myocardial dysfunction, to explore some of the problems and conflicts that these RAGE studies have raised and to consider strategies by which they might be resolved. METHODS MEDLINE was searched (1990-2010) and relevant literature collected and reviewed. RESULTS AND CONCLUSION RAGE is an inflammation-perpetuating receptor with a diverse range of ligands. Evidence supporting a role of the RAGE axis in the pathogenesis of systemic inflammation, ALI and myocardial dysfunction is compelling with numerous animal experiments showing the beneficial effects of inhibiting the RAGE axis. Despite a number of unanswered questions that need to be further addressed, the potential for inhibiting RAGE-mediated inflammation in humans undoubtedly exists.
Collapse
Affiliation(s)
- Benedict C Creagh-Brown
- Unit of Critical Care, Respiratory Science, National Heart and Lung Institute Division, Faculty of Medicine, Imperial College, London, UK
| | | | | | | |
Collapse
|
86
|
Involvement of TAGE-RAGE System in the Pathogenesis of Diabetic Retinopathy. J Ophthalmol 2010; 2010:170393. [PMID: 20652047 PMCID: PMC2905918 DOI: 10.1155/2010/170393] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Accepted: 03/29/2010] [Indexed: 02/07/2023] Open
Abstract
Diabetic complications are a leading cause of acquired blindness, end-stage renal failure, and accelerated atherosclerosis, which are associated with the disabilities and high mortality rates seen in diabetic patients. Continuous hyperglycemia is involved in the pathogenesis of diabetic micro- and macrovascular complications via various metabolic pathways, and numerous hyperglycemia-induced metabolic and hemodynamic conditions exist, including increased generation of various types of advanced glycation end-products (AGEs). Recently, we demonstrated that glyceraldehyde-derived AGEs, the predominant structure of toxic AGEs (TAGE), play an important role in the pathogenesis of angiopathy in diabetic patients. Moreover, recent evidence suggests that the interaction of TAGE with the receptor for AGEs (RAGE) elicits oxidative stress generation in numerous types of cells, all of which may contribute to the pathological changes observed in diabetic complications. In this paper, we discuss the pathophysiological role of the TAGE-RAGE system in the development and progression of diabetic retinopathy.
Collapse
|
87
|
Nakamura T, Sato E, Fujiwara N, Kawagoe Y, Suzuki T, Ueda Y, Yamada S, Shoji H, Takeuchi M, Ueda S, Matsui T, Adachi H, Okuda S, Yamagishi SI. Circulating levels of advanced glycation end products (AGE) and interleukin-6 (IL-6) are independent determinants of serum asymmetric dimethylarginine (ADMA) levels in patients with septic shock. Pharmacol Res 2009; 60:515-8. [DOI: 10.1016/j.phrs.2009.05.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Accepted: 05/11/2009] [Indexed: 01/19/2023]
|
88
|
Basta G, Castagnini M, Del Turco S, Epistolato MC, Righini P, Sangiorgi GM, De Caterina R, Tanganelli P. High plasma levels of the soluble receptor for advanced glycation endproducts in patients with symptomatic carotid atherosclerosis. Eur J Clin Invest 2009; 39:1065-72. [PMID: 19811526 DOI: 10.1111/j.1365-2362.2009.02212.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Advanced glycation endproducts (AGEs), particularly carboxymethyl(lysine)-adducts (CML), exert part of their cellular effects by binding to a receptor, named receptor for AGEs (RAGE). The soluble form of this receptor (sRAGE) has been shown to have an athero-protective role. We hypothesized the existence of a relationship between the AGE-RAGE axis and the occurrence of symptoms related to carotid atherosclerosis in nondiabetic conditions. MATERIALS AND METHODS We evaluated plasma levels of CML and sRAGE (by ELISA), and tissue levels (tAGEs and tRAGE, semiquantitatively, by immunohistochemistry) in endarterectomy carotid plaque tissue in 29 nondiabetic patients. At the time of surgery, 10 patients were asymptomatic and 19 were symptomatic. RESULTS Plasma levels of sRAGE were higher in symptomatic patients than in asymptomatic patients [median (interquartile range): 676 (394-858) pg mL(-1) vs. 347 (284-479) pg mL(-1), P = 0.009]. In symptomatic patients, plasma levels of sRAGE correlated positively with CML (r = 0.60, P < 0.01), C-reactive protein (CRP) (r = 0.618, P < 0.01) and fibrinogen (r = 0.522, P<0.005), while in asymptomatic patients, no correlation was observed. Although tissue and plasma levels of AGEs and RAGE did not correlate between each other, tAGEs and tRAGE were also positively correlated only in symptomatic patients (chi(2) = 8.93, P = 0.003). CONCLUSIONS Plasma levels of sRAGE are higher in symptomatic than asymptomatic carotid atherosclerosis. Higher levels of sRAGE in symptomatic patients may be markers of a higher degree of vascular inflammation in such patients.
Collapse
Affiliation(s)
- G Basta
- CNR Institute of Clinical Physiology, Pisa, Italy
| | | | | | | | | | | | | | | |
Collapse
|
89
|
Yamagishi SI, Adachi H, Matsui T, Nakamura K, Takeuchi M, Enomoto M, Fukami A, Otsuka M, Kumagae SI, Nanjo Y, Ueda SI, Imaizumi T. Low-density lipoprotein levels are one of the independent determinants of circulating levels of advanced glycation end products in nondiabetic subjects. Clin Cardiol 2009; 32:E12-5. [PMID: 19645034 DOI: 10.1002/clc.20532] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Nonenzymatic modification of proteins by reducing sugars leads to the formation of advanced glycation end products (AGEs), whose process has been reported to progress under diabetes. Recently, diet has been found to be a major environmental source of proinflammatory AGEs in humans. Further, fats or meat-derived products processed by high heat such as broiling have been shown to contain more AGEs than carbohydrates boiled for longer periods. Since circulating levels of low-density lipoprotein cholesterol (LDL-C) are also regulated by dietary cholesterol, it is conceivable that intake of cholesterol-rich foods could regulate serum levels of AGEs in humans. In this study, we investigated whether LDL-C levels are one of the independent determinants of circulating AGEs levels in a nondiabetic general population. METHODS A total of 170 nondiabetic Japanese subjects underwent a complete history, physical examination, determination of blood chemistries, and serum AGEs. RESULTS Univariate analysis showed that AGEs levels were associated with LDL-C (P < 0.05) and fasting plasma glucose levels (P < 0.05). By the use of multiple stepwise regression analyses, LDL-C (P < 0.01) and fasting plasma glucose levels (P < 0.05) remained significant and were independently related to AGEs levels (R2 = 0.069). CONCLUSIONS The present study is the first demonstration that LDL-C levels are one of the independent determinants of serum levels of AGEs in a nondiabetic general population. Intake of cholesterol-rich foods may regulate serum levels of AGEs in nondiabetic subjects.
Collapse
Affiliation(s)
- Sho-ichi Yamagishi
- Department of Pathophysiology and Therapeutics of Diabetic Vascular Complications, Kurume University School of Medicine, Kurume, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
90
|
Increased glycated albumin and decreased esRAGE levels are related to angiographic severity and extent of coronary artery disease in patients with type 2 diabetes. Atherosclerosis 2009; 206:540-5. [DOI: 10.1016/j.atherosclerosis.2008.12.045] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2008] [Revised: 12/27/2008] [Accepted: 12/28/2008] [Indexed: 11/24/2022]
|
91
|
Chuong C, Katz J, Pauley KM, Bulosan M, Cha S. RAGE expression and NF-kappaB activation attenuated by extracellular domain of RAGE in human salivary gland cell line. J Cell Physiol 2009; 221:430-4. [PMID: 19591173 DOI: 10.1002/jcp.21873] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The receptor for advanced-glycation-end-products (RAGE) has been implicated as a pro-inflammatory factor in chronic inflammatory conditions such as diabetes mellitus and rheumatoid arthritis. The aim of this study was to investigate the inhibitory effect of the soluble-RAGE (sRAGE), the extracellular domain of RAGE, on RAGE expression and NF-kappaB translocation in human-salivary gland-cell-lines (HSG). Cells were stimulated with agonist S100A4, fusion protein of RAGE encompassing the extracellular domain of RAGE (ex-RAGE), ex-RAGE followed by S100A4, or S100A4 followed by ex-RAGE. Our study indicates that RAGE expression was highest at 150 microg/microl of S100A4 and efficiently down-regulated by 1.8-fold (P < 0.05) when ex-RAGE was incubated prior to agonist S100A4. RAGE protein was also consistently down-regulated by 20-40% with pre-incubation of ex-RAGE. More importantly, nuclear translocation of p65 and p52 of NF-kappaB by S100A4 was inhibited in the presence of ex-RAGE, confirming anti-inflammatory function of ex-RAGE. In conclusion, ex-RAGE down-regulates RAGE expression and inhibits p65 and p52 activation in HSG, providing evidence that ex-RAGE functions as a "decoy" to RAGE-ligand interaction and thus potentially dampening inflammatory conditions.
Collapse
Affiliation(s)
- Christopher Chuong
- Oral Surgery and Diagnostic Sciences, College of Dentistry, University of Florida, Gainesville, FL 32610, USA
| | | | | | | | | |
Collapse
|
92
|
Gul A, Rahman MA, Salim A, Simjee SU. Advanced glycation end products in senile diabetic and nondiabetic patients with cataract. J Diabetes Complications 2009; 23:343-8. [PMID: 18508288 DOI: 10.1016/j.jdiacomp.2008.04.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2008] [Revised: 03/26/2008] [Accepted: 04/10/2008] [Indexed: 11/22/2022]
Abstract
BACKGROUND Advanced glycation end products (AGE) have been reported to contribute to aging and cataract formation in the lens. In the present study, AGE immunoreactivity in human serum samples of normal senile subjects (n=31), senile diabetic patients without cataract (n=33), senile diabetic patients with cataract (n=30), senile nondiabetic with cataract (n=30), and normal young subjects (n=31) was investigated. METHODS A noncompetitive ELISA with polyclonal anti-AGE antibody was performed. The patients were selected on clinical grounds from Eye Ward, Jinnah Postgraduate Medical Centre, Karachi, Pakistan. RESULTS Fasting blood glucose, glycosylated hemoglobin, and serum fructosamine were estimated. Fasting blood glucose, HbA(1C), and serum fructosamine levels were significantly (P<.001) increased in senile diabetic patients with and without cataract as compared to nondiabetic senile patients with cataract and senile control subjects. However, the serum AGEs were found to be significantly (P<.001) increased in senile diabetic patients with cataract and senile nondiabetic patients with cataract followed by the diabetic patients without cataract as compared to senile control and young control subjects. In contrast to all four senile groups, the serum AGEs were significantly (P<.001) lower in young control subjects. CONCLUSIONS The AGE distribution in the senile groups corroborates the hypothesis that the advanced glycation process might have a role in cataract formation, which in diabetic patients occurs vigorously as compared with nondiabetic cataract patients.
Collapse
Affiliation(s)
- Anjuman Gul
- Department of Biochemistry, Ziauddin University, Shahrah-e-Ghalib, Clifton, Karachi-75600, Pakistan.
| | | | | | | |
Collapse
|
93
|
Iłzecka J. Serum-soluble receptor for advanced glycation end product levels in patients with amyotrophic lateral sclerosis. Acta Neurol Scand 2009; 120:119-22. [PMID: 19053950 DOI: 10.1111/j.1600-0404.2008.01133.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease. There is evidence that oxidative stress is implicated in the pathophysiology of the neurodegenerative disorders, including ALS. Data from the literature suggests that the receptor for advanced glycation end products (RAGE) participates in pathological conditions, including oxidative stress and neurodegeneration. MATERIALS AND METHODS The study involved 20 patients with ALS and 20 patients from the control group. The serum-soluble RAGE (sRAGE) levels were measured using the enzyme-linked immunosorbent method. RESULTS The study showed that sRAGE levels are significantly decreased in serum of the patients with ALS comparing to the control group (P < 0.05). The correlation between the serum sRAGE levels and clinical parameters of the disease was not significant (P > 0.05). CONCLUSIONS The results indicate that sRAGE participates in pathophysiology of the ALS. It is possible that low sRAGE levels may influence neurodegeneration.
Collapse
Affiliation(s)
- J Iłzecka
- Department of Neurological Rehabilitation, Medical University, Lublin, Poland.
| |
Collapse
|
94
|
Maillard-Lefebvre H, Boulanger E, Daroux M, Gaxatte C, Hudson BI, Lambert M. Soluble receptor for advanced glycation end products: a new biomarker in diagnosis and prognosis of chronic inflammatory diseases. Rheumatology (Oxford) 2009; 48:1190-6. [PMID: 19589888 DOI: 10.1093/rheumatology/kep199] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The formation of advanced glycation end products (AGEs) is a result of the non-enzymatic reaction between sugars and free amino groups of proteins. AGEs, through interacting with their specific receptor for AGEs (RAGE), result in activation of pro-inflammatory states and are involved in numerous pathologic situations. The soluble form of RAGE (sRAGE) is able to act as a decoy to avoid interaction of RAGE with its pro-inflammatory ligands (AGEs, HMGB1, S100 proteins). sRAGE levels have been found to be decreased in chronic inflammatory diseases including atherosclerosis, diabetes, renal failure and the aging process. The use of measuring circulating sRAGEs may prove to be a valuable vascular biomarker and in this review, we describe the implications of sRAGE in inflammation and propose that this molecule may represent a future therapeutic target in chronic inflammatory diseases.
Collapse
Affiliation(s)
- Hélène Maillard-Lefebvre
- Department of Vascular Aging Biology, Claude Huriez Hospital, University Hospital of Lille, 1 place de Verdun, 59037 Lille cedex, France.
| | | | | | | | | | | |
Collapse
|
95
|
Tchaikovski V, Olieslagers S, Böhmer FD, Waltenberger J. Diabetes mellitus activates signal transduction pathways resulting in vascular endothelial growth factor resistance of human monocytes. Circulation 2009; 120:150-9. [PMID: 19564559 DOI: 10.1161/circulationaha.108.817528] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND Monocytes are cellular components of wound repair, arteriogenesis, and atherogenesis. Vascular endothelial growth factor (VEGF)-A and placental growth factor recruit monocytes to sites of arteriogenesis via stimulation of VEGF receptor-1 (VEGFR-1). The chemotactic response of monocytes to VEGF-A is attenuated in individuals with diabetes mellitus (DM). This VEGF resistance correlates with impaired collateral growth. The aim of this study is to elucidate the molecular basis of VEGF resistance and impaired monocyte response in DM. METHODS AND RESULTS Phosphorylation of Akt, p38, and extracellular signal-regulated kinase 1/2 (ERK1/2) could be stimulated with either placental growth factor-1 or VEGF-A in monocytes from non-DM but not DM individuals. In contrast, formyl-methionyl-leucyl-phenylalanine caused a comparable activation of these molecules in both DM and non-DM monocytes. Baseline phosphorylation of Akt, p38, and ERK1/2 was significantly elevated in monocytes from DM compared with non-DM subjects. Of note, H(2)O(2) activated Akt, p38, and ERK1/2 in non-DM monocytes ex vivo. Protein tyrosine phosphatases had stronger oxidative modifications in monocytes from DM than from non-DM individuals, which reflects functional protein tyrosine phosphatase inhibition, similar to that seen after H(2)O(2) challenge. Overall, protein tyrosine phosphatase and protein tyrosine phosphatase-1B activity were reduced in DM monocytes. DM monocytes revealed higher expression of the receptor for advanced glycation end products. Stimulation with advanced glycation end products ligands resulted in activation of non-DM monocytes and inhibition of VEGFR-1-mediated chemotaxis. The elevated baseline phosphorylation/activation of Akt, p38, and ERK1/2 in DM monocytes likely causes the resistance to further stimulation with specific stimuli such as VEGF-A, revealing a molecular explanation of the DM-related signal transduction defect. CONCLUSIONS We propose that elevated advanced glycation end products expression and increased oxidative stress in diabetic monocytes lead to activation of VEGFR-1-related signaling pathways and to desensitization of VEGFR-1 responses. These data establish VEGF resistance as a novel molecular concept for DM-related cellular dysfunction.
Collapse
Affiliation(s)
- Vadim Tchaikovski
- Department of Cardiology, Maastricht University Medical Center, Maastricht University, Maastricht, the Netherlands
| | | | | | | |
Collapse
|
96
|
Huang JS, Chuang LY, Guh JY, Huang YJ. Effects of nitric oxide and antioxidants on advanced glycation end products-induced hypertrophic growth in human renal tubular cells. Toxicol Sci 2009; 111:109-19. [PMID: 19553346 DOI: 10.1093/toxsci/kfp134] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The accumulation of advanced glycation end products (AGE) is a key mediator of renal tubular hypertrophy in diabetic nephropathy (DN). Reactive oxygen species and nitric oxide (NO) were involved in the progression of DN. In this study, the molecular mechanisms of NO and antioxidants responsible for inhibition of AGE-induced renal tubular hypertrophy were examined. We found that AGE (but not nonglycated bovine serum albumin) significantly suppressed the NO/cGMP/PKG signaling in human renal proximal tubular cells. NO donors S-nitroso-N-acetylpenicillamine (SNAP)/sodium nitroprusside (SNP) and antioxidants N-acetylcysteine (NAC)/taurine treatments significantly attenuated AGE-inhibited NO production, cGMP synthesis, and inducible NO synthase/cGMP-dependent protein kinase (PKG) activation. Moreover, AGE-induced extracellular signal-regulated kinase/c-Jun N-terminal kinase/p38 mitogen-activated protein kinase activation was markedly blocked by antireceptor for AGE (RAGE), SNAP, SNP, NAC, and taurine. The abilities of NO and antioxidants to inhibit AGE/RAGE-induced hypertrophic growth were verified by the observation that SNAP, SNP, NAC, and taurine inhibited fibronectin, p21(Waf1/Cip1), and RAGE expression. Therefore, antioxidants significantly attenuated AGE/RAGE-enhanced cellular hypertrophy partly through induction of the NO/cGMP/PKG signaling.
Collapse
Affiliation(s)
- Jau-Shyang Huang
- Department of Biological Science and Technology, Chung Hwa University of Medical Technology, 717 Tainan.
| | | | | | | |
Collapse
|
97
|
Kocsis AK, Szabolcs A, Hofner P, Takács T, Farkas G, Boda K, Mándi Y. Plasma concentrations of high-mobility group box protein 1, soluble receptor for advanced glycation end-products and circulating DNA in patients with acute pancreatitis. Pancreatology 2009; 9:383-91. [PMID: 19451748 DOI: 10.1159/000181172] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Accepted: 10/24/2008] [Indexed: 12/11/2022]
Abstract
AIMS High-mobility group box protein 1 (HMGB1), a late-acting proinflammatory cytokine, is secreted actively by inflammatory cells, and released passively from necrotic cells. From the aspect that both inflammation and necrosis are involved in the pathogenesis in acute pancreatitis, the aim of the study was a joint investigation of the plasma concentrations of HMGB1, its soluble receptor for advanced glycation end-products (sRAGE), and the circulating DNA as a marker of cell death. METHODS 62 patients with acute pancreatitis (30 mild, 32 severe), 20 patients with sepsis, and 20 healthy controls were enrolled in the study. HMGB1 and sRAGE plasma levels were measured by means of ELISA. Plasma DNA concentrations were estimated by real-time quantitative PCR for the beta-globin gene. RESULTS The circulating HMGB1 level was significantly higher in patients with severe acute pancreatitis (13.33 +/- 2.11 ng/ml) than in healthy controls (0.161 +/- 0.03 ng/ml) or than in patients with mild pancreatitis (2.64 +/- 0.185 ng/ml). The plasma concentration of sRAGE was highest in patients with sepsis (2,210 +/- 252 pg/ml), while the levels of sRAGE correlated inversely with that of HMGB1 in patients with acute pancreatitis. The plasma DNA level was significantly elevated in patients with severe acute pancreatitis (2,206 +/- 452 ng/ml). CONCLUSION A complex study of the plasma levels of HMGB1, sRAGE and circulating DNA can be informative in evaluations of acute pancreatitis with different levels of severity.
Collapse
Affiliation(s)
- A K Kocsis
- Department of Medical Microbiology and Immunology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | | | | | | | | | | | | |
Collapse
|
98
|
Nin JWM, Ferreira I, Schalkwijk CG, Prins MH, Chaturvedi N, Fuller JH, Stehouwer CDA. Levels of soluble receptor for AGE are cross-sectionally associated with cardiovascular disease in type 1 diabetes, and this association is partially mediated by endothelial and renal dysfunction and by low-grade inflammation: the EURODIAB Prospective Complications Study. Diabetologia 2009; 52:705-14. [PMID: 19183936 DOI: 10.1007/s00125-009-1263-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Accepted: 12/29/2008] [Indexed: 10/21/2022]
Abstract
AIMS/HYPOTHESIS Plasma soluble receptor for AGE (sRAGE) may reflect the activity of the AGE-RAGE axis, which has been proposed as a potential mechanism linking hyperglycaemia to vascular complications in diabetes. We have therefore investigated: (1) whether sRAGE is associated with greater prevalence of cardiovascular disease (CVD) and microvascular complications in type 1 diabetic individuals; and (2) the extent to which any such associations are explained by markers of endothelial and renal dysfunction and inflammation. METHODS The study included 477 individuals (234 women; mean age 42 +/- 10 [SD] years) from the EURODIAB Prospective Complications Study. We used linear regression analyses to investigate the differences in sRAGE levels between individuals with and without vascular complications. All analyses were adjusted for age, sex, HbA(1c), duration of diabetes and other risk factors. RESULTS Individuals with CVD (n = 116) had higher levels of sRAGE than those without CVD or any microvascular complications (n = 178): beta = 0.15 (95% CI 0.04-0.27). Further adjustments for markers of endothelial (beta = 0.13 [0.02-0.24]) and renal dysfunction (beta = 0.10 [-0.01, 0.20]) and inflammation (beta = 0.12 [0.01-0.23]) attenuated these differences; altogether these variables explained about 50% of the association between sRAGE and prevalent CVD. sRAGE levels tended to be higher in the presence and across the levels of severity of albuminuria (p for trend = 0.087) and retinopathy (p for trend = 0.057); adjustments for endothelial and renal dysfunction and inflammation also attenuated these differences. CONCLUSIONS/INTERPRETATION sRAGE is associated with greater prevalence of CVD in type 1 diabetic individuals, and these associations may be partly explained by endothelial and renal dysfunction and low-grade inflammation.
Collapse
Affiliation(s)
- J W M Nin
- Care and Public Health Research Institute (CAPHRI), Maastricht University Medical Centre, Maastricht, the Netherlands.
| | | | | | | | | | | | | | | |
Collapse
|
99
|
Sterenczak KA, Willenbrock S, Barann M, Klemke M, Soller JT, Eberle N, Nolte I, Bullerdiek J, Escobar HM. Cloning, characterisation, and comparative quantitative expression analyses of receptor for advanced glycation end products (RAGE) transcript forms. Gene 2009; 434:35-42. [DOI: 10.1016/j.gene.2008.10.027] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2008] [Revised: 07/16/2008] [Accepted: 10/31/2008] [Indexed: 11/30/2022]
|
100
|
Sparvero LJ, Asafu-Adjei D, Kang R, Tang D, Amin N, Im J, Rutledge R, Lin B, Amoscato AA, Zeh HJ, Lotze MT. RAGE (Receptor for Advanced Glycation Endproducts), RAGE ligands, and their role in cancer and inflammation. J Transl Med 2009; 7:17. [PMID: 19292913 PMCID: PMC2666642 DOI: 10.1186/1479-5876-7-17] [Citation(s) in RCA: 433] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Accepted: 03/17/2009] [Indexed: 02/07/2023] Open
Abstract
The Receptor for Advanced Glycation Endproducts [RAGE] is an evolutionarily recent member of the immunoglobulin super-family, encoded in the Class III region of the major histocompatability complex. RAGE is highly expressed only in the lung at readily measurable levels but increases quickly at sites of inflammation, largely on inflammatory and epithelial cells. It is found either as a membrane-bound or soluble protein that is markedly upregulated by stress in epithelial cells, thereby regulating their metabolism and enhancing their central barrier functionality. Activation and upregulation of RAGE by its ligands leads to enhanced survival. Perpetual signaling through RAGE-induced survival pathways in the setting of limited nutrients or oxygenation results in enhanced autophagy, diminished apoptosis, and (with ATP depletion) necrosis. This results in chronic inflammation and in many instances is the setting in which epithelial malignancies arise. RAGE and its isoforms sit in a pivotal role, regulating metabolism, inflammation, and epithelial survival in the setting of stress. Understanding the molecular structure and function of it and its ligands in the setting of inflammation is critically important in understanding the role of this receptor in tumor biology.
Collapse
Affiliation(s)
- Louis J Sparvero
- Departments of Surgery and Bioengineering, University of Pittsburgh Cancer Institute, Pittsburgh, USA.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|