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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modulation of Immune Response by RAGE and TLR4 Signalling in PBMCs of Diabetic and Non-Diabetic Patients

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Author(s):
Frasnelli, S. C. T. [1] ; de Medeiros, M. C. [1] ; Bastos, A. de S. [1] ; Costa, D. L. [2] ; Orrico, S. R. P. [1] ; Rossa Junior, C. [1]
Total Authors: 6
Affiliation:
[1] UNESP Univ Estadual Paulista, Dept Diag & Surg, Sch Dent Araraquara, Araraquara, SP - Brazil
[2] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Biochem & Immunol, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Scandinavian Journal of Immunology; v. 81, n. 1, p. 66-71, JAN 2015.
Web of Science Citations: 4
Abstract

Diabetes is associated with increased glucose levels and accumulation of glycated products. It is also associated with impairment in the immune response, such as increased susceptibility to infections. In this study, we assessed the possible interactions between TLR4 and RAGE signalling on apoptosis and on the expression of inflammatory cytokines in PBMC from individuals with and without diabetes. PBMCs were isolated from seven diabetic patients and six individuals without diabetes and stimulated in vitro with bacterial LPS (1g/ml) associated or not with BSA-AGE (200g/ml). This stimulation was performed for 6h, both in the presence and in the absence of inhibitors of TLR4 (R.sphaeroides LPS, 20g/ml) and RAGE (blocking monoclonal antibody). Apoptosis at early and late stages was assessed by the annexin-V/PI staining using flow cytometry. Regulation of TNF- and IL-10 gene expression was determined by RT-qPCR. PBMCs from diabetes patients tended to be more resistant apoptosis. There were no synergistic or antagonistic effects with the simultaneous activation of TLR4 and RAGE in PBMCs from either diabetes or non-diabetes group. Activation of TLR4 is more potent for the induction of TNF- and IL-10; RAGE signalling had a negative regulatory effect on TNF- expression induced by LPS. TLR and RAGE do not have relevant roles in apoptosis of PBMCs. The activation of TLR has greater role than RAGE in regulating the gene expression of IL-10 and TNF-. (AU)

FAPESP's process: 10/06589-8 - Effect of lipid oxidation associated or not with advanced glycation end-products on intracellular signaling pathways and on the expression of inflammatory mediators
Grantee:Carlos Rossa Junior
Support Opportunities: Regular Research Grants