Glycated albumin induces lipid infiltration in mice aorta independently of DM and RAS local modulation by inducing lipid peroxidation and inflammation

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• 作者：Diego Juvenal Gomes^a ; Ana Paula Velosa^b ; Ligia Shimabukuro Okuda^a ; Fernanda Bueno Fusco^a ; Karolinne Santana da Silva^a ; Paula Ramos Pinto^a ; Edna Regina Nakandakare^a ; Maria Lucia Correa-Giannella^c ; Tom Woods^d ; Margaret Anne Brimble^d ; Russell Pickford^e ; Kerry-Anne Rye^f ; Walcy Rosolia Teodoro^b ; Sergio Catanozi^a ; Marisa Passarelli^a ; ^{mpassere@usp.br" class="auth_mail" title="E-mail the corresponding author} ; ^{lipideq@usp.br" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Advanced glycation ; Glycated albumin ; Atherosclerosis ; Losartan ; Oxidative stress ; Inflammation
• 刊名：Journal of Diabetes and its Complications
• 出版年：2016
• 出版时间：November-December 2016
• 年：2016
• 卷：30
• 期：8
• 页码：1614-1621
• 全文大小：1123 K

文摘

Advanced glycated albumin (AGE-albumin) adversely impairs macrophage lipid homeostasis in vitro, which may be prevented by angiotensin receptor blockers. In vivo studies are inconclusive whether AGE-albumin itself plays important role in early-stage atherogenesis. We aimed at investigating how AGE-albumin by itself drives atherosclerosis development in dyslipidemic non-diabetic mice and if its effects are due to the activation of renin–angiotensin system in the arterial wall and the expression of genes and proteins involved in lipid flux.

Methods and results

Murine albumin glycation was induced by incubation with 10 mM glycolaldehyde and C-albumin with PBS alone. Twelve-week-old-male apoE knockout mice were submitted to a daily IP injection of control (C) or AGE-albumin (2 mg/mL) during 30 days with or without losartan (LOS: 100 mg/L; C + LOS and AGE + LOS). Aortic arch was removed, and gene expression was determined by RT-PCR and protein content by immunofluorescence. Plasma lipid and glucose levels were similar among groups. Systolic blood pressure was similarly reduced in both groups treated with LOS. In comparison to C-albumin, aortic lipid infiltration was 5.3 times increased by AGE-albumin, which was avoided by LOS. LOS prevented the enhancement induced by AGE-albumin in Ager, Tnf and Cybb mRNA levels but did not reduce Olr1. Nfkb and Agt mRNA levels were unchanged by AGE-albumin. LOS similarly reduced Agtr1a mRNA level in both C and AGE-albumin groups. In AGE-albumin-treated mice, immunofluorescence for carboxymethyl-lysine, 4-hydroxynonenal and RAGE was respectively, 4.8, 2.6 and 1.7 times enhanced in comparison to C-albumin. These increases were all avoided by LOS.

Conclusions

AGE-albumin evokes a pre-stage of atherogenesis in dyslipidemic mice independently of the presence of diabetes mellitus or modulation in the RAS in part by the induction of lipid peroxidation and inflammation.