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Thomas A Collier, Anthony Nash, Helen L Birch, Nora H de Leeuw
Covalently cross-linked advanced glycation end products (AGE) are among the major post-translational modifications to proteins as a result of non-enzymatic glycation. The formation of AGEs has been shown to have adverse effects on the properties of the collagenous tissue; they are even linked to a number of age related disorders. Little is known about the sites at which these AGEs form or why certain sites within the collagen are energetically more favourable than others. In this study we have used a proven fully atomistic molecular dynamics approach to identify six sites where the formation of the intra-molecular 3-deoxyglucosone-derived imidazolium cross-link (DOGDIC) is energetically favourable...
November 2016: Biophysical Chemistry
Vincent M Monnier, Saul Genuth, David R Sell
To date more than 20 glycation products were identified, of which ~15 in the insoluble human skin collagen fraction. The goal of this review is to streamline 30 years of research and ask a set of important questions: in Type 1 diabetes which glycation products correlate best with 1) past mean glycemia 2) reversibility with improved glycemic control, 2) cross-sectional severity of retinopathy, nephropathy and neuropathy and 3) the future long-term risk of progression of micro- and subclinical macrovascular disease...
August 2016: Glycoconjugate Journal
Anthony Nash, Jörg Saßmannshausen, Laurent Bozec, Helen L Birch, Nora H de Leeuw
The collagen protein provides tensile strength to the extra-cellular matrix in addition to localising cells, proteins and protein cofactors. Collagen is susceptible to a build up of glycation modifications as a result of an exceptionally long half-life. Glucosepane is a collagen crosslinking advanced glycation end product; the structural and mechanical effects of glucosepane are still the subjects of much debate. With the prospect of an ageing population, the management and treatment of age-related diseases is becoming a pressing concern...
April 19, 2016: Journal of Biomolecular Structure & Dynamics
Cristian Draghici, Tina Wang, David A Spiegel
Glucosepane is a structurally complex protein posttranslational modification that is believed to exist in all living organisms. Research in humans suggests that glucosepane plays a critical role in the pathophysiology of both diabetes and human aging, yet comprehensive biological investigations of this metabolite have been hindered by a scarcity of chemically homogeneous material available for study. Here we report the total synthesis of glucosepane, enabled by the development of a one-pot method for preparation of the nonaromatic 4H-imidazole tautomer in the core...
October 16, 2015: Science
Vincent M Monnier, Wanjie Sun, Xiaoyu Gao, David R Sell, Patricia A Cleary, John M Lachin, Saul Genuth
BACKGROUND: We recently reported strong associations between eight skin collagen AGEs and two solubility markers from skin biopsies obtained at DCCT study closeout and the long-term progression of microvascular disease in EDIC, despite adjustment for mean glycemia. Herein we investigated the hypothesis that some of these AGEs (fluorescence to be reported elsewhere) correlate with long-term subclinical cardiovascular disease (CVD) measurements, i.e. coronary artery calcium score (CAC) at EDIC year 7-9 (n = 187), change of carotid intima-media thickness (IMT) from EDIC year 1 to year 6 and 12 (n = 127), and cardiac MRI outcomes at EDIC year 15-16 (n = 142)...
2015: Cardiovascular Diabetology
Thomas A Collier, Anthony Nash, Helen L Birch, Nora H de Leeuw
The extracellular matrix (ECM) undergoes progressive age-related stiffening and loss of proteolytic digestibility due to an increase in concentration of advanced glycation end products (AGEs). The most abundant AGE, glucosepane, accumulates in collagen with concentrations over 100 times greater than all other AGEs. Detrimental collagen stiffening properties are believed to play a significant role in several age-related diseases such as osteoporosis and cardiovascular disease. Currently little is known of the potential location of covalently cross-linked glucosepane formation within collagen molecules; neither are there reports on how the respective cross-link sites affect the physical and biochemical properties of collagen...
October 2015: Matrix Biology: Journal of the International Society for Matrix Biology
Mitsuru Saito, Keishi Marumo
Data have accumulated to show that various types of collagen crosslinking are implicated in the health of individuals, as well as in a number of disease states, such as osteoporosis, diabetes mellitus, chronic kidney disease, inflammatory bowel disease, or in conditions of mild hyperhomocysteinemia, or when glucocorticoid use is indicated. Collagen crosslinking is a posttranslational modification of collagen molecules and plays important roles in tissue differentiation and in the mechanical properties of collagenous tissue...
September 2015: Calcified Tissue International
Kari Anne Sveen, Knut Dahl-Jørgensen, Knut Haakon Stensaeth, Kristin Angel, Ingebjørg Seljeflot, David R Sell, Vincent M Monnier, Kristian F Hanssen
AIMS: To study intima media thickness (cIMT) and arterial stiffness in type 1 diabetes of long duration, and their associations with the collagen cross-linker glucosepane and inflammatory and oxidative markers. METHODS: Twenty-seven individuals with type 1 diabetes mellitus of 40 years duration from the Oslo Study cohort and 24 age-matched controls were included. cIMT measurements of the carotid artery were performed longitudinally. Pulse wave velocity (PWV), augmentation index (AIx) and augmentation pressure (AP) were assessed cross-sectionally...
April 2015: Journal of Diabetes and its Complications
Saul Genuth, Wanjie Sun, Patricia Cleary, Xiaoyu Gao, David R Sell, John Lachin, Vincent M Monnier
Six skin collagen advanced glycation end products (AGEs) originally measured near to the time of the Diabetes Control and Complications Trial (DCCT) closeout in 1993 may contribute to the "metabolic memory" phenomenon reported in the follow-up Epidemiology of Diabetes Interventions and Complications (EDIC) study. We have now investigated whether the addition of four originally unavailable AGEs (i.e., glucosepane [GSPNE], hydroimidazolones of methylglyoxal [MG-H1] and glyoxal, and carboxyethyl-lysine) improves associations with incident retinopathy, nephropathy, and neuropathy events during 13-17 years after DCCT...
January 2015: Diabetes
Alfonso Gautieri, Alberto Redaelli, Markus J Buehler, Simone Vesentini
Ageing and diabetes share a common deleterious phenomenon, the formation of Advanced Glycation Endproducts (AGEs), which accumulate predominantly in collagen due to its low turnover. Though the general picture of glycation has been identified, the detailed knowledge of which collagen amino acids are involved in AGEs is still missing. In this work we use an atomistic model of a collagen fibril to pinpoint, for the first time, the precise location of amino acids involved in the most relevant AGE, glucosepane...
February 2014: Matrix Biology: Journal of the International Society for Matrix Biology
Vincent M Monnier, Wanjie Sun, David R Sell, Xingjun Fan, Ina Nemet, Saul Genuth
Advanced glycation end products (AGEs) represent a family of protein, peptide, amino acid, nucleic acid and lipid adducts formed by the reaction of carbonyl compounds derived directly or indirectly from glucose, ascorbic acid and other metabolites such as methylglyoxal. AGE formation in diabetes is of growing importance for their role as markers and potential culprits of diabetic complications, in particular retinopathy, nephropathy and neuropathy. Development of sensitive and specific assays utilizing liquid chromatography mass spectrometry with isotope dilution method has made it possible to detect and quantitate non-UV active AGEs such as carboxymethyl-lysine and glucosepane, the most prevalent AGE and protein crosslink of the extracellular matrix...
January 1, 2014: Clinical Chemistry and Laboratory Medicine: CCLM
Vincent M Monnier, David R Sell, Christopher Strauch, Wanjie Sun, John M Lachin, Patricia A Cleary, Saul Genuth
PURPOSE: We determined the association between novel and acid-labile skin collagen-linked advanced glycation endproducts (AGEs) and the progression of microvascular and neuropathic complications from baseline to near study closeout in the Diabetes Control and Complications Trial (DCCT). METHODS: From a skin biopsy obtained near the close of the DCCT, proteolytic collagen digests were analyzed by liquid chromatography/mass spectrometry (LC/MS/MS) for glucosepane (GSPNE), glyoxal and methylglyoxal hydroimidazolones (G-H1 and MG-H1) and the glycation product fructose-lysine (FL) using isotope dilution method...
March 2013: Journal of Diabetes and its Complications
Rasoul Nasiri, Martin J Field, Mansour Zahedi, Ali Akbar Moosavi-Movahedi
We report a comprehensive density functional theory (DFT) study of the mechanism of pentosidine formation. This work is a continuation of our earlier studies in which we proposed pathways for formation of glucosepane (J. Mol. Model. 2011, pp 1-15, DOI 10.1007/s00894-011-1161-x), GODIC (glyoxal-derived imidazolium cross-link), and MODIC (methyl glyoxal-derived imidazolium cross-link; J. Phys. Chem. 2011, 115, pp 13542-13555). Here we show that formation of pentosidine via reaction of α-oxoaldehydes with lysine and arginine in aqueous solution is possible thermodynamically and kinetically, in good agreement with the available experimental evidence...
March 22, 2012: Journal of Physical Chemistry. A
Philip Dammann, David R Sell, Sabine Begall, Christopher Strauch, Vincent M Monnier
Mole-rat of the genus Fukomys are mammals whose life span is strongly influenced by reproductive status with breeders far outliving nonbreeders. This raises the important question of whether increased longevity of the breeders is reflected in atypical expression of biochemical markers of aging. Here, we measured markers of glycation and advanced glycation end-products formed in insoluble skin collagen of Ansell's mole-rat Fukomys anselli as a function of age and breeding status. Glucosepane, pentosidine, and total advanced glycation end-product content significantly increased with age after correction for breeder status and sex...
June 2012: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
Xingjun Fan, Liu Xiaoqin, Breshey Potts, Christopher M Strauch, Ina Nemet, Vincent M Monnier
PURPOSE: Previous experiments from our laboratory showed that the oral intake of selected guanidino compounds could block the formation of crystallin-bound advanced ascorbylation products. Here we tested whether these were also active when applied as eye drops. METHODS: Two month old hSVCT2 transgenic mice (n=10) were treated twice daily with one drop of 0.1% L-arginine, γ-guanidinobutyric acid (GBA), penicillamine (PA) or N-acetylcysteine (NAC) in one eye and vehicle only in the other eye...
2011: Molecular Vision
Mikhail Linetsky, S R Kaid Johar, Jasmin Meltretter, Smitha Padmanabha, Trilok Parmar, Abhay R Vasavada, Monika Pischetsrieder, Ram H Nagaraj
Dideoxyosones (DDOs) are intermediates in the synthesis of advanced glycation endproducts (AGEs), such as pentosidine and glucosepane. Although the formation of pentosidine and glucosepane in the human lens has been firmly established, the formation of DDOs has not been demonstrated. The aim of this study was to develop a reliable method to detect DDOs in lens proteins. A specific DDO trapping agent, biotinyl-diaminobenzene (3,4-diamino-N-(3-[5-(2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoyl]aminopropyl)benzamide) (BDAB) was added during in vitro protein glycation or during protein extraction from human lenses...
October 2011: Archives of Biochemistry and Biophysics
Rasoul Nasiri, Mansour Zahedi, Hélène Jamet, Ali Akbar Moosavi-Movahedi
Availability and high reactivity of α-oxoaldehydes have been approved by experimental techniques not only in vivo systems but also in foodstuffs. In this article we re-examine the mechanism of glucosepane formation by using computational model chemistry. Density functional theory has been applied to propose a new mechanism for glucosepane formation through reaction of α-oxoaldehydes with methyl amine (MA) and methyl guanidine (MGU) models of lysine and arginine residues respectively. This non enzymatic process can be described in three main steps: (1) Schiff base formation from methyl amine, methyl glyoxal (MGO) (2) addition of methyl guanidine and (3) addition of glyceraldehyde...
April 2012: Journal of Molecular Modeling
Ina Nemet, Christopher M Strauch, Vincent M Monnier
We describe the isolation and molecular characterization of a novel glucose-lysine dimer crosslink 1,3-bis-(5-amino-5-carboxypentyl)-4-(1',2',3',4'-tetrahydroxybutyl)-3H-imidazolium salt, named GLUCOLD. GLUCOLD was easily formed from the Amadori product (fructose-lysine). However, when BSA was incubated with 100 mM glucose for 25 days, the levels of the lysine-lysine glucose crosslinks GLUCOLD and CROSSLINE were only 21 and <1 pmol/mg, respectively, compared to 611 pmol/mg protein for the lysine-arginine GLUCOSEPANE crosslink, in spite of more than 20 potential lysine-lysine crosslinking sites in the protein...
January 2011: Amino Acids
Xingjun Fan, David R Sell, Jianye Zhang, Ina Nemet, Mathilde Theves, Jie Lu, Christopher Strauch, Marc K Halushka, Vincent M Monnier
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...
September 1, 2010: Free Radical Biology & Medicine
M Saito, K Marumo
Collagen cross-linking, a major post-translational modification of collagen, plays important roles in the biological and biomechanical features of bone. Collagen cross-links can be divided into lysyl hydroxylase and lysyloxidase-mediated enzymatic immature divalent cross-links,mature trivalent pyridinoline and pyrrole cross-links, and glycation- or oxidation-induced non-enzymatic cross-links(advanced glycation end products) such as glucosepane and pentosidine. These types of cross-links differ in the mechanism of formation and in function...
February 2010: Osteoporosis International
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