Volume 29, Issue 1 pp. 66-76
Research Article

Advanced glycated albumin isolated from poorly controlled type 1 diabetes mellitus patients alters macrophage gene expression impairing ABCA-1-mediated reverse cholesterol transport

Adriana Machado-Lima

Adriana Machado-Lima

Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Rodrigo T. Iborra

Rodrigo T. Iborra

Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Raphael S. Pinto

Raphael S. Pinto

Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Camila H. Sartori

Camila H. Sartori

Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Erika R. Oliveira

Erika R. Oliveira

Cellular and Molecular Endocrinology Laboratory (LIM 25), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Edna R. Nakandakare

Edna R. Nakandakare

Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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José T. Stefano

José T. Stefano

Gastroenterology Laboratory (LIM 7), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Daniel Giannella-Neto

Daniel Giannella-Neto

Gastroenterology Laboratory (LIM 7), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Maria Lucia C. Corrêa-Giannella

Maria Lucia C. Corrêa-Giannella

Cellular and Molecular Endocrinology Laboratory (LIM 25), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

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Marisa Passarelli

Corresponding Author

Marisa Passarelli

Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Sao Paulo, Brazil

Marisa Passarelli, Lipids Laboratory (LIM 10), Faculty of Medical Sciences, University of Sao Paulo, Av. Dr. Arnaldo 455, Room 3305, CEP 01246-000 Sao Paulo, Brazil.

E-mail: [email protected]

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First published: 26 September 2012
Citations: 32

Abstract

Background

We evaluated the effects of albumin isolated from control individuals and from patients with poorly controlled type 1 diabetes mellitus on macrophage gene expression and on reverse cholesterol transport.

Methods

Serum albumin was purified from control subjects (n = 12) and from patients with poorly controlled type 1 diabetes mellitus (n = 13). 14C-cholesterol-labelled J774 macrophages treated with albumin were employed to measure cholesterol efflux mediated by apo A-I, HDL3 or HDL2, the intracellular lipid accumulation and the cellular ABCA-1 protein content. Agilent arrays (44000 probes) were used to analyse gene expression. Several differentially expressed genes were validated by real-time reverse transcription-PCR using TaqMan Two Step RT-PCR.

Results

Levels of glycation-modified and (carboxymethyl)lysine-modified albumin were higher in diabetic patients than in control subjects. Apo A-I-mediated and HDL2-mediated cellular cholesterol efflux were impaired in macrophages treated with albumin from diabetic patients in comparison with control albumin-treated cells, which was attributed to the reduction in ABCA-1 protein content. Even in the presence of cholesterol acceptors, a higher level of intracellular lipid was observed in macrophages exposed to albumin from diabetic individuals in comparison with the control. The reduction in ABCA-1 content was associated with enhanced expression of stearoyl CoA desaturase 1 and decreased expression of janus kinase 2, which were induced by albumin from patients with type 1 diabetes mellitus.

Conclusions

(Carboxymethyl)lysine-modified albumin isolated from poorly controlled type 1 diabetic patients impairs ABCA-1-mediated reverse cholesterol transport and elicits intracellular lipid accumulation, possibly contributing to atherosclerosis. Copyright © 2012 John Wiley & Sons, Ltd.

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