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Sourris KC, Lyons JG, Dougherty SL, Chand V, Straznicky NE, Schlaich MP, Grima MT, Cooper ME, Kingwell BA, de Courten MPJ, Forbes JM, de Courten B. Plasma advanced glycation end products (AGEs) and NF-κB activity are independent determinants of diastolic and pulse pressure. Clin Chem Lab Med 2014; 52:129-38. [PMID: 23525877 DOI: 10.1515/cclm-2012-0850] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 02/14/2013] [Indexed: 01/06/2023]
Abstract
BACKGROUND High levels of circulating advanced glycation end products (AGEs) can initiate chronic low-grade activation of the immune system (CLAIS) with each of these factors independently associated with cardiovascular (CV) morbidity and mortality. Therefore, our objective was to characterize the relationship between serum AGEs, CLAIS and other risk factors for CV disease in normotensive non-diabetic individuals. METHODS We measured body mass index (BMI), waist-to-hip ratio (WHR), blood pressure, lipid and glucose profile in 44 non-diabetic volunteers (17 female, 27 males). Carboxymethyl-lysine (CML) was measured by ELISA as a marker for circulating AGEs and NF-κB p65 activity as an inflammatory marker by DNA-binding in peripheral blood mononuclear cells lysates (PBMC). RESULTS Plasma CML concentrations were related to diastolic blood pressure (r=-0.51, p<0.01) independently of age, sex, BMI and WHR (p<0.05). Diastolic blood pressure was also related to NF-κB activity in PBMC (r=0.47, p<0.01) before and after adjustment for age, sex, BMI and WHR (p<0.05). Plasma CML concentrations were related to the pulse pressure before (r=0.42; p<0.05) and after adjustment for age, sex, BMI and waist (p<0.05). Neither CML nor NF-κB activity were related to systolic blood pressure (both p=ns). Plasma CML concentrations were not associated with plasma lipid or glucose concentrations (all p=ns). CONCLUSIONS Plasma AGE levels and NF-κB activity in PBMC were independent determinants of diastolic and pulse pressure in healthy normotensive individuals. This association suggests a role for AGEs in the etiology of hypertension, possibly via the initiation of CLAIS and aortic stiffening.
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Kerkeni M, Weiss IS, Jaisson S, Dandana A, Addad F, Gillery P, Hammami M. Increased serum concentrations of pentosidine are related to presence and severity of coronary artery disease. Thromb Res 2014; 134:633-8. [PMID: 25065554 DOI: 10.1016/j.thromres.2014.07.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 05/26/2014] [Accepted: 07/03/2014] [Indexed: 11/18/2022]
Abstract
BACKGROUND There are limited data regarding the contribution of advanced glycation end products (AGEs) in the presence of coronary artery disease (CAD). We investigated whether serum pentosidine and Nε-carboxymethyllysine (CML) were related to the presence and the severity of CAD. METHODS 69 Tunisian patients with CAD (≥ 50% obstruction in ≥ 1 coronary artery), 32 Tunisian patients without CAD but with potential cardiovascular risk factors and 60 Tunisian control subjects were included in a cross-sectional study. Patients were classified as CAD and non CAD patients according to angiographic results. The severity of CAD was assessed using the Gensini score. Serum pentosidine and CML were measured by LC-MS/MS. RESULTS Serum pentosidine and CML concentrations were significantly higher in non-CAD patients vs control subjects (P<0.001). Serum pentosidine concentrations were significantly higher in CAD patients vs non-CAD patients (P<0.001). A multiple logistic regression analysis demonstrated that pentosidine was independently associated with the presence of CAD (OR=1.52, 95% CI: 1.12-2.07, P=0.007). The area under curve (AUC) determined by ROC analysis was 0.74 (95% CI: 0.64-0.84, P<0.001) and the optimal cut-off value of pentosidine to predict the presence of CAD was 3.2 μmol/mol Lys, with 64% sensitivity and 78% specificity. Furthermore, in a multivariate stepwise regression analysis, pentosidine was independently correlated with Gensini score (standardized β= 0.46, 95% CI: 0.70-1.99, P<0.001). CONCLUSIONS High concentrations of pentosidine show the presence and the severity of CAD with high sensitivity.
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Affiliation(s)
- Mohsen Kerkeni
- Laboratory of Biochemistry, LR12ES05, Faculty of Medicine, University of Monastir, Tunisia.
| | - Izabella Santos Weiss
- Laboratory of Paediatric Biology and Research, American Memorial Hospital, University Hospital of Reims, Faculty of Medicine, Reims, France; Laboratory of Biochemistry and Molecular Biology, UMR CNRS/URCA n°7369, Faculty of Medicine, Reims, France
| | - Stephane Jaisson
- Laboratory of Paediatric Biology and Research, American Memorial Hospital, University Hospital of Reims, Faculty of Medicine, Reims, France; Laboratory of Biochemistry and Molecular Biology, UMR CNRS/URCA n°7369, Faculty of Medicine, Reims, France
| | - Azza Dandana
- Laboratory of Biochemistry, CHU-Farhat Hached, Sousse, Tunisia
| | - Faouzi Addad
- Department of Cardiology-University Hopital A. Mami, Ariana, Tunisia
| | - Philippe Gillery
- Laboratory of Paediatric Biology and Research, American Memorial Hospital, University Hospital of Reims, Faculty of Medicine, Reims, France; Laboratory of Biochemistry and Molecular Biology, UMR CNRS/URCA n°7369, Faculty of Medicine, Reims, France
| | - Mohamed Hammami
- Laboratory of Biochemistry, LR12ES05, Faculty of Medicine, University of Monastir, Tunisia
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Hofmann B, Yakobus Y, Indrasari M, Nass N, Santos AN, Kraus FB, Silber RE, Simm A. RAGE influences the development of aortic valve stenosis in mice on a high fat diet. Exp Gerontol 2014; 59:13-20. [PMID: 24818652 DOI: 10.1016/j.exger.2014.05.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Revised: 05/01/2014] [Accepted: 05/03/2014] [Indexed: 11/26/2022]
Abstract
Advanced glycation end product (AGE) accumulations as well as a high fat diet are associated with cardiovascular diseases. AGEs are recognized by several receptor molecules of which the receptor of AGEs (RAGE) is currently the most intensively studied. Activation of RAGE causes an unfavorable pro-inflammatory state. The hypothesis of this study was that metabolic stress due to a high fat diet results in the development of aortic valve stenosis and that knockout of RAGE should be protective. Six week old male C57BL/6N and C57BL/6N RAGE-/- mice (n=28) were randomly assigned to 4 groups and fed with normal or high fat diet for 32weeks. Weight gain was determined weekly. At the start of the experiment and after 2, 4 and 7months, echocardiographic assessments of the aortic valve were made. At the end of the experiment, plasma lipid levels and histological changes of the valves were determined. The high fat diet resulted in accelerated weight gain. However, after 7month, only C57BL/6 mice developed increased trans-aortic-valve velocities, leaflet thickness and reduced valve area index (p<0.0001). Immunohistochemistry of the aortic valves revealed in C57BL/6N mice on a high fat diet more calcification, AGE accumulation and RAGE expression when compared to normal fed control. Hearts and aortic valves of RAGE-/- mice showed less morphometric changes, calcification and AGE accumulation. After 7months of high fat feeding C57BL/6 mice (p<0.0001) as well as RAGE-/- mice (p=0.007) had significantly increased cholesterol levels compared to normal fed control, however RAGE-/- mice were probably protected due to a better HDL/LDL ratio when compared to wild type animals (p=0.003). These data suggest that AGEs and RAGE are involved in the development of obesity, hypercholesterolemia and aortic valve changes due to metabolic stress from high fat intake.
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Affiliation(s)
- Britt Hofmann
- Department of Cardiothoracic Surgery, University Hospital, Halle (Saale), Germany.
| | - Yuliana Yakobus
- Department of Cardiothoracic Surgery, University Hospital, Halle (Saale), Germany
| | - Mailiza Indrasari
- Department of Internal Medicine, St. Marien Hospital Siegen, Germany
| | - Norbert Nass
- Institute of Pathology, Otto von Guericke University, Magdeburg, Germany
| | | | | | - Rolf-Edgar Silber
- Department of Cardiothoracic Surgery, University Hospital, Halle (Saale), Germany
| | - Andreas Simm
- Department of Cardiothoracic Surgery, University Hospital, Halle (Saale), Germany
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Caffeic acid phenethyl ester, a 5-lipoxygenase enzyme inhibitor, alleviates diabetic atherosclerotic manifestations: effect on vascular reactivity and stiffness. Chem Biol Interact 2014; 213:28-36. [PMID: 24508943 DOI: 10.1016/j.cbi.2014.01.019] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 12/29/2013] [Accepted: 01/30/2014] [Indexed: 01/07/2023]
Abstract
Atherosclerosis is a major macrovascular complication of diabetes that increases the risks for myocardial infarction, stroke, and other vascular diseases. The effect of a selective 5-lipoxygenase enzyme inhibitor; caffeic acid phenethyl ester (CAPE) on diabetes-induced atherosclerotic manifestations was investigated. Insulin deficiency or resistance was induced by STZ or fructose respectively. Atherosclerosis developed when rats were left for 8 or 12 weeks subsequent STZ or fructose administration respectively. CAPE (30 mg kg(-1) day(-1)) was given in the last 6 weeks. Afterwards, blood pressure (BP) was recorded. Then, isolated aorta reactivity to KCl and phenylephrine (PE) was studied. Blood glucose level, serum levels of insulin, tumor necrosis factor α (TNF-α) as well as advanced glycation end products (AGEs) were determined. Moreover aortic haem oxygenase-1 (HO-1) protein expression and collagen deposition were also assessed. Insulin deficiency and resistance were accompanied with elevated BP, exaggerated response to KCl and PE, elevated serum TNF-α and AGEs levels. Both models showed marked increase in collagen deposition. However, CAPE alleviated systolic and diastolic BP elevations and the exaggerated vascular contractility to both PE and KCl in both models without affecting AGEs level. CAPE inhibited TNF-α serum level elevation, induced aortic HO-1 expression and reduced collagen deposition. CAPE prevented development of hyperinsulinemia in insulin resistance model without any impact on the developed hyperglycemia in insulin deficiency model. In conclusion, CAPE offsets the atherosclerotic changes associated with diabetes via amelioration of the significant functional and structural derangements in the vessels in addition to its antihyperinsulinemic effect in insulin resistant model.
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Wang Y, Yu Q, Fan D, Cao F. Coronary heart disease in Type 2 diabetes: mechanisms and comprehensive prevention strategies. Expert Rev Cardiovasc Ther 2014; 10:1051-60. [DOI: 10.1586/erc.12.52] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Akhtar R. In vitro characterisation of arterial stiffening: From the macro- to the nano-scale. Artery Res 2014. [DOI: 10.1016/j.artres.2014.01.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Lan TH, Huang XQ, Tan HM. Vascular fibrosis in atherosclerosis. Cardiovasc Pathol 2013; 22:401-7. [DOI: 10.1016/j.carpath.2013.01.003] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 12/10/2012] [Accepted: 01/08/2013] [Indexed: 01/10/2023] Open
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van den Oord SCH, Renaud G, Bosch JG, de Jong N, van der Steen AFW, Schinkel AFL. Far wall pseudo-enhancement: a neglected artifact in carotid contrast-enhanced ultrasound? Atherosclerosis 2013; 229:451-2. [PMID: 23880203 DOI: 10.1016/j.atherosclerosis.2013.04.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 04/12/2013] [Accepted: 04/23/2013] [Indexed: 12/22/2022]
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Mahmoud MF, Hassan NA, El Bassossy HM, Fahmy A. Quercetin protects against diabetes-induced exaggerated vasoconstriction in rats: effect on low grade inflammation. PLoS One 2013; 8:e63784. [PMID: 23717483 PMCID: PMC3661670 DOI: 10.1371/journal.pone.0063784] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 04/05/2013] [Indexed: 01/18/2023] Open
Abstract
Vascular complications are the leading cause of morbidity and mortality in patients with diabetes. Quercetin is an important flavonoid with antioxidant and anti-inflammatory activity. Here, the effect of quercetin on diabetes-induced exaggerated vasoconstriction in insulin deficient and insulin resistant rat models was investigated. Insulin deficiency was induced by streptozotocin while, insulin resistance by fructose. Rats were left 8 weeks or 12 weeks after STZ or fructose administration respectively. Quercetin was daily administered in the last 6 weeks. Then, tail blood pressure (BP) was recorded in conscious animals; concentration-response curves for phenylephrine (PE) and KCl were studied in thoracic aorta rings. Non-fasting blood glucose level, serum insulin level, insulin resistance index, serum tumour necrosis factor-α (TNF-α) and serum C-reactive protein (CRP) were determined. Nuclear transcription factor-κB (NF-κB) was assessed by immunofluorescence technique. Histopathological examination was also performed. The results showed that quercetin protected against diabetes-induced exaggerated vasoconstriction and reduced the elevated blood pressure. In addition, quercetin inhibited diabetes associated adventitial leukocyte infiltration, endothelial pyknosis and increased collagen deposition. These effects were accompanied with reduction in serum level of both TNF-α and CRP and inhibition of aortic NF-κB by quercetin in both models of diabetes. On the other hand, quercetin did not affect glucose level in any of the used diabetic models. This suggests that the protective effect of quercetin is mediated by its anti-inflammatory effect rather than its metabolic effects. In summary, quercetin is potential candidate to prevent diabetic vascular complications in both insulin deficiency and resistance via its inhibitory effect on inflammatory pathways especially NF-κB signaling.
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Affiliation(s)
- Mona F Mahmoud
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt.
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Palko JR, Iwabe S, Pan X, Agarwal G, Komáromy AM, Liu J. Biomechanical properties and correlation with collagen solubility profile in the posterior sclera of canine eyes with an ADAMTS10 mutation. Invest Ophthalmol Vis Sci 2013; 54:2685-95. [PMID: 23518772 DOI: 10.1167/iovs.12-10621] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE We examined the biomechanical properties and correlation with the collagen solubility profile of the posterior sclera in a canine model of primary open-angle glaucoma caused by the G661R missense mutation in the ADAMTS10 gene. METHODS Scleral strips from ADAMTS10-mutant (affected) dogs and age-matched controls were collected. Viscoelastic properties (i.e., complex modulus and tan[δ]) were measured using dynamic mechanical analysis (DMA) with a 0.15% sinusoidal strain at different frequencies superimposed upon different preloads. A tensile ramp was performed following DMA. The collagen solubility profile was examined using a colorimetric hydroxyproline assay to determine the amount of soluble and insoluble collagen. The viscoelastic properties were compared between groups using linear mixed models for repeated measures at different preloads and frequencies. The correlation between the biomechanical properties and collagen content were evaluated using Pearson correlations. RESULTS Complex modulus and tan(δ) were significantly lower in the affected group (P < 0.001), and the differences were consistent at different preloads and frequencies. The B value from the tensile ramp test also was significantly lower in the affected group (P = 0.02). The insoluble collagen was significantly lower in the affected group (P < 0.05) and correlated positively with the complex modulus (R = 0.88, P < 0.005). CONCLUSIONS An inherently weaker and biochemically distinct posterior sclera was observed in dogs with the G661R missense mutation in ADAMTS10 before clinical indications of optic nerve damage. It remains to be shown whether and how the altered scleral biomechanics may affect the rate of glaucoma progression following intraocular pressure elevation.
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Affiliation(s)
- Joel R Palko
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
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Hofmann B, Adam AC, Jacobs K, Riemer M, Erbs C, Bushnaq H, Simm A, Silber RE, Santos AN. Advanced glycation end product associated skin autofluorescence: A mirror of vascular function? Exp Gerontol 2013; 48:38-44. [DOI: 10.1016/j.exger.2012.04.011] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 03/08/2012] [Accepted: 04/25/2012] [Indexed: 11/29/2022]
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Rolewska P, Al-Robaiy S, Navarrete Santos A, Simm A, Silber RE, Bartling B. Age‐related expression, enzymatic solubility and modification with advanced glycation end‐products of fibrillar collagens in mouse lung. Exp Gerontol 2013; 48:29-37. [DOI: 10.1016/j.exger.2012.04.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 04/12/2012] [Accepted: 04/18/2012] [Indexed: 12/28/2022]
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63
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Frøkjaer JB, Brock C, Brun J, Simren M, Dimcevski G, Funch-Jensen P, Drewes AM, Gregersen H. Esophageal distension parameters as potential biomarkers of impaired gastrointestinal function in diabetes patients. Neurogastroenterol Motil 2012; 24:1016-e544. [PMID: 22738347 DOI: 10.1111/j.1365-2982.2012.01966.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Gastrointestinal (GI) symptoms, such as nausea, vomiting, bloating, postprandial fullness, and abdominal pain, are frequent in patients with diabetes mellitus (DM). The pathogenesis is complex and multi-factorial. To determine easy accessible and valid biomarkers for disordered GI function in DM patients, we aimed to study esophageal mechanical parameters and their relation to symptoms typically arising from the digestive tract. METHODS Seventeen patients with longstanding DM and GI symptoms and 13 healthy controls were studied using ultrasound monitored esophageal distension. The sensory response was recorded and their symptoms registered. Biomechanical parameters, such as compliance and stiffness were computed from luminal diameters during distension based on the ultrasound images and from pressure data. Biomechanical and sensory parameters were correlated with the clinical data. KEY RESULTS Diabetes patients had reduced esophageal sensitivity compared with controls (P = 0.046). The esophageal compliance was reduced (P = 0.004) and the esophageal stiffness was increased (P = 0.004) in the diabetes patients. Among patients, both postprandial fullness/early satiety and bloating correlated negatively to the esophageal compliance parameters (all P < 0.05). CONCLUSIONS & INFERENCES Patients with long-standing DM and GI symptoms had reduced esophageal sensitivity together with reduced compliance and increased stiffness, which were correlated to the patients' GI symptoms. Biomechanical parameters obtained during distension may serve as biomarker for similar pathophysiologic effects of diabetes in the stomach and small bowel. They may contribute to our understanding of the pathophysiology underlying GI dysfunction and symptoms in patients with longstanding DM.
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Affiliation(s)
- J B Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg Hospital, Aarhus University Hospital, Aalborg, Denmark.
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Phillips JK, Vance AM, Raj RS, Mandalà M, Linder EA, Gokina NI. Impact of experimental diabetes on the maternal uterine vascular remodeling during rat pregnancy. Reprod Sci 2012; 19:322-31. [PMID: 22383782 DOI: 10.1177/1933719111424435] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Normal pregnancy is associated with an increase in uteroplacental blood flow in part due to growth and remodeling of the maternal uterine vasculature. In this study, we characterized the effect of diabetic pregnancy on vascular growth of the maternal uterine vasculature and on the passive mechanical properties of the uterine resistance arteries. Diabetes was induced in pregnant rats by injection of streptozotocin and confirmed by development of hyperglycemia. Fetuses of diabetic rats were significantly smaller and placentas larger compared to controls. Pregnancy-induced axial elongation of the mesometrial uterine vasculature was not altered by diabetes. Vascular wall thickness was unchanged between groups. Wall distensibility was increased and the rate constant of an exponential function fitted to stress-strain curve was significantly reduced demonstrating decreased wall stiffness in diabetic uterine radial arteries compared to controls. We conclude that experimental diabetes in rat pregnancy does not compromise the growth of maternal uterine vasculature but alters passive mechanical properties of the uterine radial arteries.
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Affiliation(s)
- Julie K Phillips
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of Vermont, Burlington, Vermont, USA.
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65
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Progressive structural and biomechanical changes in elastin degraded aorta. Biomech Model Mechanobiol 2012; 12:361-72. [PMID: 22623109 DOI: 10.1007/s10237-012-0404-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Accepted: 05/01/2012] [Indexed: 10/28/2022]
Abstract
Aortic aneurysm is an important clinical condition characterized by common structural changes such as the degradation of elastin, loss of smooth muscle cells, and increased deposition of fibrillary collagen. With the goal of investigating the relationship between the mechanical behavior and the structural/biochemical composition of an artery, this study used a simple chemical degradation model of aneurysm and investigated the progressive changes in mechanical properties. Porcine thoracic aortas were digested in a mild solution of purified elastase (5 U/mL) for 6, 12, 24, 48, and 96 h. Initial size measurements show that disruption of the elastin structure leads to increased artery dilation in the absence of periodic loading. The mechanical properties of the digested arteries, measured with a biaxial tensile testing device, progress through four distinct stages termed (1) initial-softening, (2) elastomer-like, (3) extensible-but-stiff, and (4) collagen-scaffold-like. While stages 1, 3, and 4 are expected as a result of elastin degradation, the S-shaped stress versus strain behavior of the aorta resulting from enzyme digestion has not been reported previously. Our results suggest that gradual changes in the structure of elastin in the artery can lead to a progression through different mechanical properties and thus reveal the potential existence of an important transition stage that could contribute to artery dilation during aneurysm formation.
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Won KB, Chang HJ, Park SH, Hong SY, Jang Y, Chung N. High serum advanced glycation end-products predict coronary artery disease irrespective of arterial stiffness in diabetic patients. Korean Circ J 2012; 42:335-40. [PMID: 22701499 PMCID: PMC3369965 DOI: 10.4070/kcj.2012.42.5.335] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Revised: 09/26/2011] [Accepted: 10/26/2011] [Indexed: 01/11/2023] Open
Abstract
Background and Objectives Advanced glycation end-products (AGEs) contribute to the development of atherosclerosis. We investigated whether serum AGEs are related to the presence or severity of coronary artery disease (CAD), and explored the association between serum AGEs and arterial stiffness according to diabetes status in patients suspected of having CAD. Subjects and Methods The measurement of serum AGEs and brachial-ankle pulse wave velocity (baPWV) were performed in 145 consecutive patients (63±9 years, 58% men) who received a coronary angiogram for evaluation of CAD. Results Forty-four diabetics and 101 non-diabetics were classified into three subgroups based on the number of diseased vessels with obstructive CAD: 0, 1, and 2 or more vessel diseases (VDs). Serum AGEs were significantly higher in diabetics with obstructive CAD than in those without obstructive CAD (2.16±0.29 vs. 1.85±0.29 mU/mL, p=0.010) and were significantly correlated with the number of VDs only in diabetics (r=0.504, p<0.001). Serum AGEs were not significantly correlated with baPWV in diabetics or non-diabetics. In receiver operating characteristics analysis, the cut-off value of serum AGEs as a predictor of obstructive CAD was 1.98 mU/mL, with 64% sensitivity and 63% specificity in diabetics. In multiple regression analysis, serum AGEs independently predicted obstructive CAD and were associated with the number of VDs in diabetics. Conclusion Serum AGEs independently predict obstructive CAD and the severity of coronary atherosclerosis irrespective of arterial stiffness only in diabetics. Evaluation of PWV and serum AGEs together may be more effective to identify the risk of CAD in diabetic individuals.
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Affiliation(s)
- Ki-Bum Won
- Department of Cardiology, Yonsei Cardiovascular Center, Yonsei University College of Medicine, Seoul, Korea
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Chow MJ, Zou Y, He H, McGowan FX, Zurakowski D, Zhang Y. Obstruction-induced pulmonary vascular remodeling. J Biomech Eng 2012; 133:111009. [PMID: 22168741 DOI: 10.1115/1.4005301] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Pulmonary obstruction occurs in many common forms of congenital heart disease. In this study, pulmonary artery (PA) banding is used as a model for pulmonary stenosis. Significant remodeling of the vascular bed occurs as a result of a prolonged narrowing of the PAs, and here we quantify the biophysical and molecular changes proximal and distal to the obstruction. Main and branch PAs are harvested from banded and sham rabbits and their mechanical properties are assessed using a biaxial tensile tester. Measurements defined as initial and stiff slopes are taken, assuming a linear region at the start and end of the J-shaped stress-strain curves, along with a transitional knee point. Collagen, elastin assays, Movat's pentachrome staining, and Doppler protocols are used to quantify biochemical, structural, and physiological differences. The banded main PAs have significantly greater initial slopes while banded branch PAs have lower initial slopes; however, this change in mechanical behavior cannot be explained by the assay results as the elastin content in both main and branch PAs is not significantly different. The stiff slopes of the banded main PAs are higher, which is attributed to the significantly greater amounts of insoluble collagen. Shifting of the knee points reveals a decreased toe region in the main PAs but an opposite trend in the branch PAs. The histology results show a loss of integrity of the media, increase in ground substance, and dispersion of collagen in the banded tissue samples. This indicates other structural changes could have led to the mechanical differences in banded and normal tissue.
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Affiliation(s)
- Ming-Jay Chow
- Department of Mechanical Engineering, Boston University, Boston, MA 02215
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Rocic P. Why is coronary collateral growth impaired in type II diabetes and the metabolic syndrome? Vascul Pharmacol 2012; 57:179-86. [PMID: 22342811 DOI: 10.1016/j.vph.2012.02.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 01/30/2012] [Accepted: 02/01/2012] [Indexed: 11/26/2022]
Abstract
Type II diabetes and the metabolic syndrome are strong predictors of severity of occlusive coronary disease and poorer outcomes of coronary revascularization therapies. Coronary collateral growth can provide an alternative or accessory pathway of revascularization. However, collateral growth is impaired in type II diabetes and the metabolic syndrome. Although many factors necessary for collateral growth are known and many interventions have shown promising results in animal studies, not a single attempt to induce coronary collateral growth in human clinical trials has led to satisfactory results. Accordingly, the first part of this review outlines the known deleterious effects of diabetes and the metabolic syndrome on factors necessary for collateral growth, including pro-angiogenic growth factors, endothelial function, the redox state of the coronary circulation, intracellular signaling, leukocytes and bone marrow-derived progenitors cells. The second section highlights the gaps in our current knowledge of how these factors interact with the radically altered environment of the coronary circulation in diabetes and the metabolic syndrome. The interplay between these pathologies and inadequately explored areas related to the temporal regulation of collateral remodeling and the roles of the extracellular matrix, vascular cell phenotype and pro-inflammatory cytokines are emphasized with implications to development of efficient therapies.
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Affiliation(s)
- Petra Rocic
- Department of Biochemistry and Molecular Biology, University of South Alabama College of Medicine, Mobile, AL 36688, United States.
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Terai N, Spoerl E, Haustein M, Hornykewycz K, Haentzschel J, Pillunat LE. Diabetes mellitus affects biomechanical properties of the optic nerve head in the rat. Ophthalmic Res 2011; 47:189-94. [PMID: 22156545 DOI: 10.1159/000331990] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Accepted: 03/22/2011] [Indexed: 11/19/2022]
Abstract
BACKGROUND To investigate the effect of diabetes on the biomechanical behavior of the optic nerve head (ONH) and the peripapillary sclera (ppSc) in streptozocine-induced diabetic rats. METHODS Diabetes mellitus was induced in 20 Wistar rats using streptozocine. Twenty-five nondiabetic rats served as controls. Eyes were enucleated after 12 weeks and 2 strips of one eye were prepared containing ONH or ppSc. The stress-strain relation was measured in the stress range of 0.05-10 MPa using a biomaterial tester. RESULTS At 5% strain the stress of the ONH in diabetic rats was 897±295 kPa and in the control group it was 671±246 kPa; there was a significant difference between both groups (p=0.011). The stress of the diabetic ppSc (574±185 kPa) increased compared to that of the nondiabetic ppSc (477±171 kPa), but this did not reach statistical significance (p=0.174). The calculated tangent modulus at 5% strain was 11.79 MPa in the diabetic ONH and 8.77 MPa in the nondiabetic ONH; there was a significant difference between both groups (p=0.006). The calculated tangent modulus at 5% strain was 7.17 MPa in the diabetic ppSc and 6.12 MPa in the nondiabetic ppSc, without a statistically significant difference (p=0.09). CONCLUSION In contrast to the ppSc, the ONH of diabetic rats showed a significant increase in stiffness compared to nondiabetic rats, which might be explained by nonenzymatic collagen cross-linking mediated by advanced glycation end products due to high blood glucose levels in diabetes. Further studies are needed to investigate if these biomechanical changes represent a detrimental risk factor for intraocular pressure regulation in diabetic glaucoma patients.
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Affiliation(s)
- Naim Terai
- Department of Ophthalmology, Carl Gustav Carus University Hospital, Dresden, Germany.
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70
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Chow MJ, Zhang Y. Changes in the Mechanical and Biochemical Properties of Aortic Tissue due to Cold Storage. J Surg Res 2011; 171:434-42. [DOI: 10.1016/j.jss.2010.04.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2009] [Revised: 03/05/2010] [Accepted: 04/08/2010] [Indexed: 10/19/2022]
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71
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Chen J, Ye X, Yan T, Zhang C, Yang XP, Cui X, Cui Y, Zacharek A, Roberts C, Liu X, Dai X, Lu M, Chopp M. Adverse effects of bone marrow stromal cell treatment of stroke in diabetic rats. Stroke 2011; 42:3551-8. [PMID: 21940967 DOI: 10.1161/strokeaha.111.627174] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND AND PURPOSE Cell therapy with bone marrow stromal cells (BMSCs) improves functional recovery after stroke in nondiabetic rats. However, its effect on diabetics with stroke is unknown. This study investigated the effect of BMSCs on stroke outcome in Type 1 diabetic (T1DM) rats. METHODS T1DM was induced in adult male Wistar rats by injecting streptozotocin. Nondiabetic and T1DM rats were subjected to 2 hours of middle cerebral artery occlusion (MCAO), treated with or without BMSCs (3×10(6)) at 24 hours after MCAO, and monitored for 14 days. RESULTS Functional benefit was not detected in T1DM-MCAO treated with BMSC rats compared with corresponding T1DM-MCAO controls. BMSC treatment in T1DM-MCAO rats had increased mortality, blood-brain barrier leakage, brain hemorrhage, and angiogenesis. Internal carotid artery neointimal formation and cerebral arteriole narrowing/occlusion were also observed in T1DM-MCAO+BMSCs rats compared with T1DM-MCAO controls (P<0.05), but not in nondiabetic stroke rats. We further studied the underlying mechanisms responsible for BMSC-induced blood-brain barrier leakage and accelerated vascular damage in T1DM-MCAO rats. We found that the expression of angiogenin (an angiogenic factor) and ED1 (a marker for macrophages) was significantly increased in the T1DM-MCAO+BMSC rats in the ischemic brain and internal carotid artery compared with nontreated T1DM-MCAO rats, but not in nondiabetic stroke rats. CONCLUSIONS BMSC therapy in T1DM-MCAO rats does not improve functional outcome. On the contrary, it increases blood-brain barrier leakage and cerebral artery neointimal formation, and arteriosclerosis, which possibly is due to increased expression of angiogenin. Thus, BMSC treatment starting 24 hours after MCAO may not be beneficial for diabetic subjects with stroke.
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Affiliation(s)
- Jieli Chen
- Henry Ford Hospital, E&R Building, 3091, Detroit, MI 48202, USA.
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72
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Katz PS, Trask AJ, Souza-Smith FM, Hutchinson KR, Galantowicz ML, Lord KC, Stewart JA, Cismowski MJ, Varner KJ, Lucchesi PA. Coronary arterioles in type 2 diabetic (db/db) mice undergo a distinct pattern of remodeling associated with decreased vessel stiffness. Basic Res Cardiol 2011; 106:1123-34. [PMID: 21744279 DOI: 10.1007/s00395-011-0201-0] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 06/09/2011] [Accepted: 06/28/2011] [Indexed: 12/23/2022]
Abstract
Little is known about the impact of type 2 diabetes mellitus (DM) on coronary arteriole remodeling. The aim of this study was to determine the mechanisms that underlie coronary arteriole structural remodeling in type 2 diabetic (db/db) mice. Passive structural properties of septal coronary arterioles isolated from 12- to 16-week-old diabetic db/db and control mice were assessed by pressure myography. Coronary arterioles from 12-week-old db/db mice were structurally similar to age-matched controls. By 16 weeks of age, coronary wall thickness was increased in db/db arterioles (p < 0.01), while luminal diameter was reduced (control: 118 ± 5 μm; db/db: 102 ± 4 μm, p < 0.05), augmenting the wall-to-lumen ratio by 58% (control: 5.9 ± 0.6; db/db: 9.5 ± 0.4, p < 0.001). Inward hypertrophic remodeling was accompanied by a 56% decrease in incremental elastic modulus (p < 0.05, indicating decreased vessel coronary wall stiffness) and a ~30% reduction in coronary flow reserve (CFR) in diabetic mice. Interestingly, aortic pulse wave velocity and femoral artery incremental elastic modulus were increased (p < 0.05) in db/db mice, indicating macrovascular stiffness. Molecular tissue analysis revealed increased elastin-to-collagen ratio in diabetic coronaries when compared to control and a decrease in the same ratio in the diabetic aortas. These data show that coronary arterioles isolated from type 2 diabetic mice undergo inward hypertrophic remodeling associated with decreased stiffness and increased elastin-to-collagen ratio which results in a decreased CFR. This study suggests that coronary microvessels undergo a different pattern of remodeling from macrovessels in type 2 DM.
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Affiliation(s)
- Paige S Katz
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
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73
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McKee CT, Last JA, Russell P, Murphy CJ. Indentation versus tensile measurements of Young's modulus for soft biological tissues. TISSUE ENGINEERING. PART B, REVIEWS 2011; 17:155-64. [PMID: 21303220 PMCID: PMC3099446 DOI: 10.1089/ten.teb.2010.0520] [Citation(s) in RCA: 393] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Accepted: 02/07/2011] [Indexed: 12/21/2022]
Abstract
In this review, we compare the reported values of Young's modulus (YM) obtained from indentation and tensile deformations of soft biological tissues. When the method of deformation is ignored, YM values for any given tissue typically span several orders of magnitude. If the method of deformation is considered, then a consistent and less ambiguous result emerges. On average, YM values for soft tissues are consistently lower when obtained by indentation deformations. We discuss the implications and potential impact of this finding.
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Affiliation(s)
- Clayton T. McKee
- Department of Surgical and Radiological Science, School of Veterinary Medicine, University of California Davis, Davis, California
| | - Julie A. Last
- Department of Chemical and Biological Engineering, University of Wisconsin–Madison, Madison, Wisconsin
| | - Paul Russell
- Department of Surgical and Radiological Science, School of Veterinary Medicine, University of California Davis, Davis, California
| | - Christopher J. Murphy
- Department of Surgical and Radiological Science, School of Veterinary Medicine, University of California Davis, Davis, California
- Department of Ophthalmology and Vision Science, School of Medicine, University of California Davis, Davis, California
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74
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Akhtar R, Sherratt MJ, Cruickshank JK, Derby B. Characterizing the elastic properties of tissues. MATERIALS TODAY (KIDLINGTON, ENGLAND) 2011; 14:96-105. [PMID: 22723736 PMCID: PMC3378034 DOI: 10.1016/s1369-7021(11)70059-1] [Citation(s) in RCA: 178] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The quality of life of ageing populations is increasingly determined by age-related changes to the mechanical properties of numerous biological tissues. Degradation and mechanical failure of these tissues has a profound effect on human morbidity and mortality. Soft tissues have complex and intricate structures and, similar to engineering materials, their mechanical properties are controlled by their microstructure. Thus age-relate changes in mechanical behavior are determined by changes in the properties and relative quantities of microstructural tissue components. This review focuses on the cardiovascular system; it discusses the techniques used both in vivo and ex vivo to determine the age-related changes in the mechanical properties of arteries.
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Affiliation(s)
- Riaz Akhtar
- School of Materials, The University of Manchester, Grosvenor Street, Manchester, M1 7HS, UK
- Cardiovascular Sciences Research Group, Manchester Academic Health Science Centre, The University of Manchester, 46 Grafton Street, Manchester, M13 9NT, UK
| | - Michael J. Sherratt
- Regenerative Biomedicine, Manchester Academic Health Science Centre, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - J. Kennedy Cruickshank
- Cardiovascular Sciences Research Group, Manchester Academic Health Science Centre, The University of Manchester, 46 Grafton Street, Manchester, M13 9NT, UK
| | - Brian Derby
- School of Materials, The University of Manchester, Grosvenor Street, Manchester, M1 7HS, UK
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75
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Fan X, Sell DR, Zhang J, Nemet I, Theves M, Lu J, Strauch C, Halushka MK, Monnier VM. Anaerobic vs aerobic pathways of carbonyl and oxidant stress in human lens and skin during aging and in diabetes: A comparative analysis. Free Radic Biol Med 2010; 49:847-56. [PMID: 20541005 PMCID: PMC2910832 DOI: 10.1016/j.freeradbiomed.2010.06.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 05/21/2010] [Accepted: 06/02/2010] [Indexed: 01/30/2023]
Abstract
The effects of anaerobic (lens) vs aerobic (skin) environment on carbonyl and oxidant stress are compared using de novo and existing data on advanced glycation and oxidation products in human crystallins and collagen. Almost all modifications increase with age. Methylglyoxal hydroimidazolones, carboxymethyllysine, and carboxyethyllysine are severalfold higher in lens than in skin and markedly increase upon incubation of lens crystallins with 5mM ascorbic acid. In contrast, fructose-lysine, glucosepane crosslinks, glyoxal hydroimidazolones, metal-catalyzed oxidation (allysine), and H(2)O(2)-dependent modifications (2-aminoapidic acid and methionine sulfoxide) are markedly elevated in skin, but relatively suppressed in the aging lens. In both tissues ornithine is the dominant modification, implicating arginine residues as the principal target of the Maillard reaction in vivo. Diabetes (here mostly type 2 studied) increases significantly fructose-lysine and glucosepane in both tissues (P<0.001) but has surprisingly little effect on the absolute level of most other advanced glycation end products. However, diabetes strengthens the Spearman correlation coefficients for age-related accumulation of hydrogen peroxide-mediated modifications in the lens. Overall, the data suggest that oxoaldehyde stress involving methylglyoxal from either glucose or ascorbate is predominant in the aging noncataractous lens, whereas aging skin collagen undergoes combined attack by nonoxidative glucose-mediated modifications, as well as those from metal-catalyzed oxidation and H(2)O(2).
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Affiliation(s)
- Xingjun Fan
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
| | - David R Sell
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
| | - Jianye Zhang
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
- Dept. of Chemistry, Case Western Reserve University, Cleveland, OH
| | - Ina Nemet
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
| | - Mathilde Theves
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
- Dept. of Biochemistry, Case Western Reserve University, Cleveland, OH
| | - Jie Lu
- Dept. of Pathology, John Hopkins Medical Institutions, Baltimore, MD USA
| | | | - Marc K. Halushka
- Dept. of Pathology, John Hopkins Medical Institutions, Baltimore, MD USA
| | - Vincent M. Monnier
- Dept. of Pathology, Case Western Reserve University, Cleveland, OH
- Dept. of Biochemistry, Case Western Reserve University, Cleveland, OH
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76
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Makita S, Abiko A, Naganuma Y, Nagai M, Nakamura M. Chronic kidney disease is associated with increased carotid artery stiffness without morphological changes in participants of health check-up programs. Atherosclerosis 2010; 213:306-10. [PMID: 20832066 DOI: 10.1016/j.atherosclerosis.2010.08.057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 08/11/2010] [Accepted: 08/12/2010] [Indexed: 11/24/2022]
Abstract
BACKGROUND AND METHODS Patients with chronic kidney disease (CKD) show a much higher risk of cardiovascular disease. However, the mechanisms underlying this association and the impact of CKD on behaviors of the vascular walls have not been fully clarified. Using ultrasonography, this study investigated associations of CKD (estimated glomerular filtration rate <60 ml/min/1.73 m(2) and/or presence of proteinuria) with both elasticity (stiffness β index) of the carotid artery and intimal atherosclerotic changes in participants of health check-up programs (n=3406, 63% men; mean age, 58.8 years). RESULTS Stiffness β was significantly higher in CKD subjects (7.49 ± 0.14) than in non-CKD subjects (6.87 ± 0.05, P<0.001). This significant difference was maintained in a multiple adjusted model including conventional risk factors such as hypertension, diabetes mellitus, dyslipidemia, smoking and obesity (7.20 ± 0.14 vs. 6.91 ± 0.05, P=0.043). No significant differences in intima-media complex thickness or plaque score were seen between CKD and non-CKD subjects. CONCLUSION In participants of health check-up programs, CKD was associated with increased carotid arterial stiffness without intimal disease, independently of conventional risk factors. These findings indicate that CKD may predispose the carotid arteries to earlier development of arteriosclerosis, characterized by increased arterial stiffness.
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Affiliation(s)
- Shinji Makita
- Division of Cardiology, Department of Internal Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka 0208505, Japan.
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77
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Jing YH, Chen KH, Yang SH, Kuo PC, Chen JK. Resveratrol ameliorates vasculopathy in STZ-induced diabetic rats: role of AGE-RAGE signalling. Diabetes Metab Res Rev 2010; 26:212-22. [PMID: 20474069 DOI: 10.1002/dmrr.1076] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Resveratrol (RSV) has been shown to ameliorate hyperglycaemia and hyperlipidaemia in streptozotocin-induced diabetic rats. In the present study, we examined the beneficial effects of RSV on diabetes mellitus (DM)-induced vasculopathy and explored its possible mechanism. METHODS Male Sprague-Dawley rats were injected with streptozotocin at 65 mg/kg body weight The induction of DM was confirmed by a fasting plasma glucose level > or = 300 mg/dL and symptoms of polyphagia and polydipsia. The DM rats were treated with or without RSV at 0.75 mg/kg body weight three times a day for 4-8 weeks. Animals were sacrificed and vessel wall histology was examined by microscopy. The vascular smooth muscle cell activation was assessed by the medial thickness, collagen deposition, and the expressions receptor for advanced glycation end product, NF-kappaB, proliferation cell nuclear antigen, and the levels of Erk1/2 phosphorylation. RESULTS In RSV-treated DM rats, the vascular wall thickening, collagen deposition/cross-linking, and vascular permeability were all alleviated compared with that of the untreated DM rats. The vascular smooth muscle cell of the RSV-treated rats was characterized with less proliferation, lower NF-kappaB, and Erk1/2 activation, decreased proliferation cell nuclear antigen and receptor for advanced glycation end product expression. Moreover, the plasma fructosamine was significantly reduced in RSV-treated DM rats. CONCLUSIONS RSV alleviated DM-induced vasculopathy through attenuation of advanced glycation end product-receptor for advanced glycation end product-NF-kappaB signalling pathway.
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Affiliation(s)
- Yu-Hong Jing
- Department of Physiology, College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
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78
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Makita S, Matsui H, Naganuma Y, Abiko A, Tamada M, Nakamura M. Diabetic state as a crucial factor for impaired arterial elastic properties in patients with peripheral arterial disease. Atherosclerosis 2010; 208:167-70. [DOI: 10.1016/j.atherosclerosis.2009.06.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2009] [Revised: 04/16/2009] [Accepted: 06/29/2009] [Indexed: 01/21/2023]
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79
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Biomechanical and histomorphometric colon remodelling in STZ-induced diabetic rats. Dig Dis Sci 2009; 54:1636-42. [PMID: 18989775 DOI: 10.1007/s10620-008-0540-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Accepted: 09/11/2008] [Indexed: 12/13/2022]
Abstract
The histomorphologic and passive biomechanical properties were studied in the mid-colon of 16 non-diabetic and 20 streptozotocin (STZ)-induced diabetic rats (50 mg/kg STZ, ip). The diabetic rats were divided into groups living 4 and 8 weeks after the induction of diabetes (n = 10 for each group). The mechanical test was a ramp distension of fluid into the colon in vitro. The colon diameter and length were obtained from digitized images of the segments at pre-selected pressures and at the no-load and zero-stress states. Circumferential and longitudinal stresses and strains were computed from the length, diameter, and pressure data and from the zero-stress state geometry. The blood glucose level increased 3-4-fold in the diabetic rats compared with the controls (P < 0.001). Diabetes generated pronounced increases in the colon weight per length, wall thickness, and wall cross-sectional area (P < 0.001). Histologically, the thickness of all layers was increased during diabetes (P < 0.05), especially the mucosa layer. The opening angle, and absolute values of residual strain increased in the diabetic group (P < 0.05 and P < 0.01, respectively). Furthermore, diabetes increased the circumferential and longitudinal stiffness of the colon wall (P < 0.001). The observed changes in residual strain, opening angle, and stress-strain relation may be contributing factors to colonic dysfunction and abdominal pain in diabetic patients.
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80
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Akhtar R, Schwarzer N, Sherratt M, Watson R, Graham H, Trafford A, Mummery P, Derby B. Nanoindentation of histological specimens: Mapping the elastic properties of soft tissues. JOURNAL OF MATERIALS RESEARCH 2009; 24:638-646. [PMID: 20396607 PMCID: PMC2854807 DOI: 10.1557/jmr.2009.0130] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Although alterations in the gross mechanical properties of dynamic and compliant tissues have a major impact on human health and morbidity, there are no well-established techniques to characterize the micromechanical properties of tissues such as blood vessels and lungs. We have used nanoindentation to spatially map the micromechanical properties of 5-mum-thick sections of ferret aorta and vena cava and to relate these mechanical properties to the histological distribution of fluorescent elastic fibers. To decouple the effect of the glass substrate on our analysis of the nanoindentation data, we have used the extended Oliver and Pharr method. The elastic modulus of the aorta decreased progressively from 35 MPa in the adventitial (outermost) layer to 8 MPa at the intimal (innermost) layer. In contrast, the vena cava was relatively stiff, with an elastic modulus >30 MPa in both the extracellular matrix-rich adventitial and intimal regions of the vessel. The central, highly cellularized, medial layer of the vena cava, however, had an invariant elastic modulus of ~20 MPa. In extracellular matrix-rich regions of the tissue, the elastic modulus, as determined by nanoindentation, was inversely correlated with elastic fiber density. Thus, we show it is possible to distinguish and spatially resolve differences in the micromechanical properties of large arteries and veins, which are related to the tissue microstructure.
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Affiliation(s)
- R. Akhtar
- Address all correspondence to this author. e-mail:
| | - N. Schwarzer
- Saxonian Institute of Surface Mechanics (SIO), Ummanz 18569, Germany
| | - M.J. Sherratt
- Tissue Injury and Repair Group, Faculty of Medical and Human Sciences, University of Manchester, Manchester M13 9PT, United Kingdom
| | - R.E.B. Watson
- Dermatological Sciences Research Group, Faculty of Medical and Human Sciences, University of Manchester, Manchester M13 9PT, United Kingdom
| | - H.K. Graham
- Unit of Cardiac Physiology, Division of Cardiovascular and Endocrine Sciences, University of Manchester, Manchester M13 9NT, United Kingdom
| | - A.W. Trafford
- Unit of Cardiac Physiology, Division of Cardiovascular and Endocrine Sciences, University of Manchester, Manchester M13 9NT, United Kingdom
| | - P.M. Mummery
- School of Materials, University of Manchester, Manchester M1 7HS, United Kingdom
| | - B. Derby
- School of Materials, University of Manchester, Manchester M1 7HS, United Kingdom
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Semba RD, Najjar SS, Sun K, Lakatta EG, Ferrucci L. Serum carboxymethyl-lysine, an advanced glycation end product, is associated with increased aortic pulse wave velocity in adults. Am J Hypertens 2009; 22:74-9. [PMID: 19023277 PMCID: PMC2637811 DOI: 10.1038/ajh.2008.320] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND The relationship between advanced glycation end products and arterial stiffness has previously been examined in highly selected groups of patients with diabetes or hypertension. Our aim was to determine whether elevated serum advanced glycation end products are associated with increased arterial stiffness in relatively healthy, community-dwelling adults. METHODS Aortic pulse wave velocity (PWV), an index of aortic stiffness, and serum advanced glycation end products (AGEs), as represented by the specific AGE, serum carboxymethyl-lysine (CML), were measured in 493 adults, aged 26-93 years, who participated in the Baltimore Longitudinal Study of Aging (BLSA). RESULTS Mean (s.d.) PWV (m/s) was 6.6 (1.8) m/s. Mean CML was 0.47 (0.13) microg/ml. Serum CML (per 1 s.d.) was associated with PWV (beta = 0.16, s.e. = 0.07, P = 0.02), adjusting for age, sex, body mass index, mean arterial pressure, fasting plasma glucose, high-density lipoprotein cholesterol, smoking, and other covariates. After excluding all diabetic patients, serum CML (per 1 s.d.) was associated with PWV (beta = 0.18, s.e. = 0.07, P = 0.009), adjusting for the same covariates. CONCLUSIONS Elevated AGEs are associated with increased arterial stiffness, a known predictor of adverse cardiovascular outcomes, among relatively healthy community-dwelling adults. Interventions to lower levels of AGEs, such as altering the pattern of dietary intake, warrant examination as putative novel strategies to lower arterial stiffness in adults.
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Affiliation(s)
- Richard D Semba
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
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82
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Pyle AL, Atkinson JB, Pozzi A, Reese J, Eckes B, Davidson JM, Crimmins DL, Young PP. Regulation of the atheroma-enriched protein, SPRR3, in vascular smooth muscle cells through cyclic strain is dependent on integrin alpha1beta1/collagen interaction. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:1577-88. [PMID: 18832573 DOI: 10.2353/ajpath.2008.080042] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Atherosclerotic plaques express high levels of small proline-rich repeat protein (SPRR3), a previously characterized component of the cornified cell envelope of stratified epithelia, where it is believed to play a role in cellular adaptation to biomechanical stress. We investigated the physiological signals and underlying mechanism(s) that regulate atheroma-enriched SPRR3 expression in vascular smooth muscle cells (VSMCs). We showed that SPRR3 is expressed by VSMCs in both human and mouse atheromas. In cultured arterial VSMCs, mechanical cyclic strain, but neither shear stress nor lipid loading induced SPRR3 expression. Furthermore, this upregulation of SPRR3 expression was dependent on VSMC adherence to type I collagen. To link the mechanoregulation of SPRR3 to specific collagen/integrin interactions, we used blocking antibodies against either integrin alpha1 or alpha2 subunits and VSMCs from mice that lack specific collagen receptors. Our results showed a dependence on the alpha1beta1 integrin for SPRR3 expression induced by cyclic strain. Furthermore, we showed that integrin alpha1 but not alpha2 subunits were expressed on VSMCs within mouse lesions but not in normal arteries. Therefore, we identified the enrichment of the mechanical strain-regulated protein SPRR3 in VSMCs of both human and mouse atherosclerotic lesions whose expression is dependent on the collagen-binding integrin alpha1beta1 on VSMCs. These data suggest that SPRR3 may play a role in VSMC adaptation to local biomechanical stress within the plaque microenvironment.
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Affiliation(s)
- Amy L Pyle
- Vanderbilt University Medical Center, Department of Pathology, Nashville, TN 37232, USA
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83
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Lieber SC, Qiu H, Chen L, Shen YT, Hong C, Hunter WC, Aubry N, Vatner SF, Vatner DE. Cardiac dysfunction in aging conscious rats: altered cardiac cytoskeletal proteins as a potential mechanism. Am J Physiol Heart Circ Physiol 2008; 295:H860-6. [PMID: 18567712 DOI: 10.1152/ajpheart.00146.2008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The objective of this study was to test the hypothesis that the mechanism mediating left ventricular (LV) dysfunction in the aging rat heart involves, in part, changes in cardiac cytoskeletal components. Our results show that there were no significant differences in heart rate, LV pressure, or LV diameter between conscious, instrumented young [5.9 +/- 0.3 mo (n = 9)] and old rats [30.6 +/- 0.1 mo (n = 10)]. However, the first derivative of LV pressure (LV dP/dt) was reduced (8,309 +/- 790 vs. 11,106 +/- 555 mmHg/s, P < 0.05) and isovolumic relaxation time (tau) was increased (8.7 +/- 0.7 vs. 6.3 +/- 0.6 ms, P < 0.05) in old vs. young rats, respectively. The differences in baseline LV function in young and old rats, which were modest, were accentuated after beta-adrenergic receptor stimulation with dobutamine (20 mug/kg), which increased LV dP/dt by 170 +/- 9% in young rats, significantly more (P < 0.05) than observed in old rats (115 +/- 5%). Volume loading in anesthetized rats demonstrated significantly impaired LV compliance in old rats, as measured by the LV end-diastolic pressure and dimension relationship. In old rat hearts, there was a significant (P < 0.05) increase in the percentage of LV collagen (2.4 +/- 0.2 vs. 1.3 +/- 0.2%), alpha-tubulin (92%), and beta-tubulin (2.3-fold), whereas intact desmin decreased by 51%. Thus the cardiomyopathy of aging in old, conscious rats may be due not only to increases in collagen but also to alterations in cytoskeletal proteins.
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Affiliation(s)
- Samuel C Lieber
- Dept. of Cell Biology & Molecular Medicine, UMDNJ-New Jersey Medical School, 185 South Orange Ave., MSB G-609, Newark, NJ 07103, USA
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84
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Yang Y, Ma Y, Han W, Li J, Xiang Y, Liu F, Ma X, Zhang J, Fu Z, Su YD, Du XJ, Gao XM. Age-related differences in postinfarct left ventricular rupture and remodeling. Am J Physiol Heart Circ Physiol 2008; 294:H1815-22. [PMID: 18263717 DOI: 10.1152/ajpheart.00831.2007] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cardiac rupture is more prevalent in elderly patients with first onset of acute myocardial infarct (MI), but the mechanism remains unexplored. We investigated the differences in the incidence of cardiac rupture and early left ventricular (LV) remodeling following coronary artery ligation between old (12-mo) and young (3-mo) C57Bl/6 male mice and explored responsible mechanisms. The incidence of rupture within 1 wk after MI was significantly higher in old than in young mice (40.7 vs. 18.3%, P = 0.013) despite a similar infarct size in both age groups. Old mice dying of rupture had more severe infarct expansion than young counterparts. Echocardiography and catheterization at day 7 revealed more profound LV chamber dilatation and dysfunction as well as higher blood pressures in aged mice. At day 3 after MI immediately before the peak of rupture occurrence, we observed significantly higher content of type I and III collagen, a greater density of macrophage and neutrophil, and markedly enhanced mRNA expression of inflammatory cytokines in the infarcted myocardium in old than in young mice. Furthermore, a more dramatic increment of matrix metalloproteinase (MMP)-9 activity was found in old than in young infarcted hearts, in keeping with enhanced inflammatory response. Collectively, these results revealed that old mice had a higher risk of post-MI cardiac rupture despite a higher level of collagen content and cross-linking. Enhanced inflammatory response and subsequent increase in MMP-9 activity together with higher blood pressure are important factors responsible for the higher risk of cardiac rupture and more severe LV remodeling in the aged heart following acute MI.
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Affiliation(s)
- Yining Yang
- Cardiovascular Research Institute, Xinjiang Medical University, Xinjinag, China
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85
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Abstract
The biophysical characteristics of vascular tissues are dependent largely on the properties of fibrillar collagens. Considering the predominant structural component, collagen type I, the present review describes the mechanisms of formation and maturation of lysyl oxidase-mediated cross-linking, leading to an understanding of how intracellular collagen-modifying enzymes affect the patterns of cross-links produced. An important distinction is made between the enzyme-mediated cross-linking, essential for optimum tissue function, and the non-enzymatic aging processes that generally lead to structural changes deleterious to function. Finally, the extracellular matrix of vascular tissue is a multicomponent system and the role of other major constituents, such as elastin and glycosaminoglycans, in modifying tissue properties should be considered. Some details of newer methods being developed to quantify these constituents will be presented.
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86
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Frokjaer JB, Andersen SD, Ejskjaer N, Funch-Jensen P, Drewes AM, Gregersen H. Impaired contractility and remodeling of the upper gastrointestinal tract in diabetes mellitus type-1. World J Gastroenterol 2007; 13:4881-90. [PMID: 17828820 PMCID: PMC4611767 DOI: 10.3748/wjg.v13.i36.4881] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
AIM: To investigate that both the neuronal function of the contractile system and structural apparatus of the gastrointestinal tract are affected in patients with longstanding diabetes and auto mic neuropathy.
METHODS: The evoked esophageal and duodenal contractile activity to standardized bag distension was assessed using a specialized ultrasound-based probe. Twelve type-1 diabetic patients with autonomic neuropathy and severe gastrointestinal symptoms and 12 healthy controls were studied. The geometry and biomechanical parameters (strain, tension/stress, and stiffness) were assessed.
RESULTS: The diabetic patients had increased frequency of distension-induced contractions (6.0 ± 0.6 vs 3.3 ± 0.5, P < 0.001). This increased reactivity was correlated with the duration of the disease (P = 0.009). Impaired coordination of the contractile activity in diabetic patients was demonstrated as imbalance between the time required to evoke the first contraction at the distension site and proximal to it (1.5 ± 0.6 vs 0.5 ± 0.1, P = 0.03). The esophageal wall and especially the mucosa-submucosa layer had increased thickness in the patients (P < 0.001), and the longitudinal and radial compressive stretch was less in diabetics (P < 0.001). The esophageal and duodenal wall stiffness and circumferential deformation induced by the distensions were not affected in the patients (all P > 0.14).
CONCLUSION: The impaired contractile activity with an imbalance in the distension-induced contractions likely reflects neuronal abnormalities due to autonomic neuropathy. However, structural changes and remodeling of the gastrointestinal tract are also evident and may add to the neuronal changes. This may contribute to the pathophysiology of diabetic gut dysfunction and impact on future management of diabetic patients with gastrointestinal symptoms.
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Affiliation(s)
- Jens Brondum Frokjaer
- Center for Visceral Biomechanics and Pain, Department of Radiology, Aalborg Hospital, DK-9100 Aalborg, Denmark.
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87
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Qiu H, Depre C, Ghosh K, Resuello RG, Natividad FF, Rossi F, Peppas A, Shen YT, Vatner DE, Vatner SF. Mechanism of gender-specific differences in aortic stiffness with aging in nonhuman primates. Circulation 2007; 116:669-76. [PMID: 17664374 DOI: 10.1161/circulationaha.107.689208] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Our hypothesis was that the changes in vascular properties responsible for aortic stiffness with aging would be greater in old male monkeys than old female monkeys. METHODS AND RESULTS We analyzed the effects of gender differences in aging on in vivo measurements of aortic pressure and diameter and on extracellular matrix of the thoracic aorta in young adult (age, 6.6+/-0.5 years) versus old adult (age, 21.2+/-0.2 years) monkeys (Macaca fascicularis). Aortic stiffness, as represented by the pressure strain elastic modulus (Ep), increased more in old male monkeys (5.08+/-0.81; P<0.01) than in old females (3.06+/-0.52). In both genders, collagen density was maintained, collagen-bound glycation end products increased, and collagen type 1 decreased. However, elastin density decreased significantly (from 22+/-1.5% to 15+/-1.2%) with aging (P<0.05) only in males. Furthermore, only old males were characterized by a decrease (P<0.05) in collagen type 3 (an isoform that promotes elasticity) and an increase in collagen type 8 (an isoform that promotes the neointimal migration of vascular smooth muscle cells). In contrast to the data in monkeys, collagen types 1 and 3 both increased significantly in aging rats. CONCLUSIONS There are major species differences in the effects of aging on aortic collagen types 1 and 3. Furthermore, because alterations in collagen density, collagen content, hydroxyproline, and collagen advanced glycation end products were similar in both old male and female monkeys, these factors cannot be responsible for the greater increase in stiffness in old males. However, changes in collagen isoforms and the decrease in elastin observed only in old males likely account for the greater increase in aortic stiffness.
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Affiliation(s)
- Hongyu Qiu
- Cardiovascular Research Institute, Department of Cell Biology and Molecular Medicine, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, 185 S Orange Ave, Newark, NJ 07103, USA
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88
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Jaisson S, Larreta-Garde V, Bellon G, Hornebeck W, Garnotel R, Gillery P. Carbamylation differentially alters type I collagen sensitivity to various collagenases. Matrix Biol 2007; 26:190-6. [PMID: 17156988 DOI: 10.1016/j.matbio.2006.10.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2006] [Revised: 10/25/2006] [Accepted: 10/25/2006] [Indexed: 11/27/2022]
Abstract
Carbamylation is a post-translational modification due to nonenzymatic binding of cyanate, a by-product of urea, on free amino groups of proteins. Post-translational modifications are known to induce alterations in structural and functional properties of proteins, thus disturbing protein-protein or cell-protein interactions. We report the impact of carbamylation on type I collagen sensitivity to enzymatic proteolysis. Type I collagen was extracted from rat tail tendons and carbamylated by incubation with 0.1 M potassium cyanate at 37 degrees C for 2, 6 or 24 h. Degradation assays revealed that carbamylated collagen exhibited a greater resistance to collagenases (i.e. bacterial collagenase, matrix metalloproteinase(MMP)-1, MMP-8 and MMP-13), together with an increased sensitivity to MMP-2. Evaluation of collagen triple helix conformation by polarimetry indicated that local destabilizations of triple helix structure related to carbamylation could be responsible for the observed differences in sensitivity. These results confirm the crucial role of triple helix integrity in the degradation of type I collagen by MMPs, and support the deleterious impact of post-translational modifications in vivo by altering the balanced remodeling of collagen within connective tissue.
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Affiliation(s)
- Stéphane Jaisson
- Laboratory of Biochemistry and Molecular Biology, CNRS UMR 6198, IFR53 Biomolecules, Faculty of Medicine, University of Reims Champagne Ardenne, 51 rue Cognacq Jay, 51095 Reims Cedex, France
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89
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Graham HK, Trafford AW. Spatial disruption and enhanced degradation of collagen with the transition from compensated ventricular hypertrophy to symptomatic congestive heart failure. Am J Physiol Heart Circ Physiol 2006; 292:H1364-72. [PMID: 17071734 DOI: 10.1152/ajpheart.00355.2006] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The cardiac extracellular matrix (ECM) maintains the structural and mechanical integrity of the myocardium. We determined the alterations in the composition of the ECM coincident with the transition from compensated left ventricular (LV) hypertrophy (LVH) to symptomatic congestive heart failure (CHF) and the mechanisms underlying such changes. Heart failure was induced in ferrets by aortic banding. Myocardial collagen content was assessed by HPLC and histological analysis. Matrix metalloproteinase (MMP) activity and tissue inhibitor of metalloproteinase (TIMP) expression were evaluated using gelatin zymography and Western blotting, respectively. LV free wall thickness increased by 29% in asymptomatic LVH and was associated with a 20% increase in interstitial fibrosis (P < 0.05). CHF was coincident with increased plasma angiotensin II levels (149 +/- 48, 40 +/- 19, and 5.6 +/- 1 pg/ml for CHF, LVH, and sham, respectively; P < 0.01, CHF vs. sham and LVH), ventricular dilatation (LV internal diameter = 15 +/- 0.4 vs. 9 +/- 0.1 mm, P < 0.05), increased active MMP-9 (3.0- and 2.2-fold increase over sham and LVH, respectively, n = 5-10 animals per group, P < 0.01), and reduced myocardial total collagen content (3.5 +/- 0.4, 2.6 +/- 0.3, and 2.2 +/- 0.3% in sham, LVH, and CHF, respectively, P < 0.05). In CHF the distribution of collagen was markedly altered, becoming punctate in nature. No difference in MMP-2 activity, TIMP-1, TIMP-2, TIMP-3, or TIMP-4 expression, or collagen cross-linking was found at any time. The present work demonstrates structural reorganization and loss of collagen from cardiac ECM during the transition to decompensated CHF. The enhanced MMP-9 activity coincident with the transition to CHF provides potential therapeutic opportunities for managing the progression from asymptomatic LVH to symptomatic CHF.
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Affiliation(s)
- H K Graham
- Unit of Cardiac Physiology, Division of Cardiovascular & Endocrine Sciences, Univ of Manchester, 3.08 Core Technology Facility, Manchester, UK
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90
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Huebschmann AG, Regensteiner JG, Vlassara H, Reusch JEB. Diabetes and advanced glycoxidation end products. Diabetes Care 2006; 29:1420-32. [PMID: 16732039 DOI: 10.2337/dc05-2096] [Citation(s) in RCA: 192] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Amy G Huebschmann
- Division of General Internal Medicine, Department of Medicine, University of Colorado Denver and Health Sciences Center, Mailstop F-729, Aurora, CO 80045, USA.
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91
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Abstract
Gastrointestinal (GI) sensory-motor abnormalities are common in patients with diabetes mellitus and may involve any part of the GI tract. Abnormalities are frequently sub-clinical, and fortunately only rarely do severe and life-threatening problems occur. The pathogenesis of abnormal upper GI sensory-motor function in diabetes is incompletely understood and is most likely multi-factorial of origin. Diabetic autonomic neuropathy as well as acute suboptimal control of diabetes has been shown to impair GI motor and sensory function. Morphological and biomechanical remodeling of the GI wall develops during the duration of diabetes, and may contribute to motor and sensory dysfunction. In this review sensory and motility disorders of the upper GI tract in diabetes is discussed; and the morphological changes and biomechanical remodeling related to the sensory-motor dysfunction is also addressed.
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Affiliation(s)
- Jingbo Zhao
- Center of Excellence in Visceral Biomechanics and Pain, the Research Building room 404, Aalborg Hospital, Sdr. Skovvej 15, DK-9000 Aalborg, Denmark.
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92
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Araki T, Emoto M, Yokoyama H, Maeno T, Hatsuda S, Mori K, Koyama H, Shoji T, Inaba M, Nishizawa Y. The association of plasma adiponectin level with carotid arterial stiffness. Metabolism 2006; 55:587-92. [PMID: 16631433 DOI: 10.1016/j.metabol.2005.11.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2005] [Accepted: 11/28/2005] [Indexed: 10/24/2022]
Abstract
Adiponectin plays important roles in protecting against both insulin resistance and the development of atherosclerosis. The aim of the present study was to investigate the clinical impact of plasma adiponectin on arterial stiffness, a functional property of atherosclerosis, in type 2 diabetic and nondiabetic subjects. We evaluated plasma adiponectin levels and stiffness index beta for the common carotid artery assessed by ultrasound using a phase-locked echo-tracking system for 98 type 2 diabetic subjects and 116 nondiabetic subjects as controls. Plasma adiponectin levels were significantly lower in the diabetic than in the nondiabetic group. The stiffness index beta was significantly higher in the diabetic than in the nondiabetic group. Plasma adiponectin level was significantly correlated with stiffness index beta in the group of all subjects (r=-0.189, P=.006) and the nondiabetic group (r=-0.187, P=.045), but not in the diabetic group (r=0.045, P=.665). On multiple regression analysis, plasma adiponectin level was found to be a significant independent contributor to stiffness index beta in the group of all subjects (beta=-0.232, P=.020) and the nondiabetic group (beta=-0.337, P=.016), but not in the diabetic group. In conclusion, adiponectin is significantly but weakly associated with carotid arterial stiffness independently of known atherogenic factors in the nondiabetic group and that of all subjects, although no significant association between these variables was found in the group of diabetic subjects.
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Affiliation(s)
- Takahiro Araki
- Metabolism, Endocrinology, and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka 545-8585, Japan
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93
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Kinoshita Y, Saito M, Satoh I, Shomori K, Suzuki H, Yamada M, Kono T, Satoh K. General administration of cyclohexenonic long-chain fatty alcohol ameliorates hyperreactivity of STZ-induced diabetic rat aorta. Life Sci 2006; 78:1508-14. [PMID: 16310809 DOI: 10.1016/j.lfs.2005.07.043] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Accepted: 07/14/2005] [Indexed: 01/20/2023]
Abstract
Diabetic neuropathy, a major complication of diabetes mellitus, is associated with the development of vascular dysfunction and autonomic neuropathy. We studied the effects of cyclohexenonic long-chain fatty alcohol (FA) on streptozotocin-diabetic hyperreactivity in the rat aorta smooth muscle. The rats were divided randomly into four groups and were maintained for 4 weeks: age-matched control rats, diabetic rats without treatment with FA, and diabetic rats treated with FA (2 and 8 mg/kg, i.p. everyday). The serum glucose and insulin levels were determined, and the contractile responses of the aorta induced by a thromboxane A2 agonist, U46619 and KCl were investigated. Treatment with FA did not alter rats' diabetic status, i.e., body weight, thickness of the aorta, serum glucose levels, and serum insulin levels, but significantly improved the diabetic-induced hyperreactivity of the rat aorta in a dose-dependent manner. Removal of endothelium did not change contractile force between groups. In histological examinations, thinning of smooth muscle bundle in the wall of aorta was observed in the diabetic rat, which was not significantly improved by treatment with FA. Our data indicate that FA can prevent hyperreactivity in the diabetic aorta.
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MESH Headings
- Acetylcholine/pharmacology
- Animals
- Aorta/drug effects
- Aorta/pathology
- Aorta/physiology
- Aorta/physiopathology
- Blood Glucose/metabolism
- Cyclohexanones/pharmacology
- Diabetes Mellitus, Experimental/blood
- Diabetes Mellitus, Experimental/pathology
- Diabetes Mellitus, Experimental/physiopathology
- Fatty Alcohols/pharmacology
- In Vitro Techniques
- Male
- Malondialdehyde/metabolism
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/pathology
- Muscle, Smooth, Vascular/physiopathology
- Rats
- Rats, Sprague-Dawley
- Reference Values
- Vasoconstriction/drug effects
- Vasodilation/drug effects
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Affiliation(s)
- Yukako Kinoshita
- Department of Pathophysiological and Therapeutic Science, Division of Molecular Pharmacology, Tottori University Faculty of Medicine, 86 Nishimachi, Yonago 683-8503, Japan
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94
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Castello L, Froio T, Cavallini G, Biasi F, Sapino A, Leonarduzzi G, Bergamini E, Poli G, Chiarpotto E. Calorie restriction protects against age-related rat aorta sclerosis. FASEB J 2005; 19:1863-5. [PMID: 16150801 DOI: 10.1096/fj.04-2864fje] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Many theories have been advanced to account for the ageing process, among which the free radical theory deserves much attention. Numerous studies have also shown an association between tissue fibrosis and oxidative stress. Of note, fibrosis may be considered a significant index of tissue ageing. Calorie restriction (CR) has been demonstrated to maintain many physiological processes in a youthful state until a very advanced age. However the anti-ageing mechanisms of CR are still not fully understood. We thus evaluated the effect of CR on oxidative damage and its relationship with fibrosis during ageing. We found a significant increase of both oxidative stress and fibrosis parameters in the aortae from aged vs. young rats. CR reversed both phenomena. CR also protected against the age-associated increase of Jun-N-terminal kinase and p-38 activities, involved in TGFbeta1 expression and signaling. On the contrary, extracellular regulated kinases did not show any age-related change. CR similarly reversed the age-related increase of AP-1 DNA binding activity and the AP-1-dependent increase of vimentin gene expression. In parallel, CR reversed the age-related morphological alterations of the aorta wall cell composition. These data further support the relationship between oxidative stress and fibrosis in different diseases and during ageing. The protection exerted by CR against fibrosclerosis might be due to a decrease of oxidative stress, with consequent decreased MAPK activity and down-regulation of AP-1 activation and of TGFbeta1 expression and signaling.
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Affiliation(s)
- Laura Castello
- Department of Clinical and Biological Sciences, University of Turin, Italy
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