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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.)

High Glucose Environments Interfere with Bone Marrow-Derived Macrophage Inflammatory Mediator Release, the TLR4 Pathway and Glucose Metabolism

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Ayala, Thais Soprani [1] ; Galvao Tessaro, Fernando Henrique [1] ; Jannuzzi, Grasielle Pereira [2] ; Bella, Leonardo Mendes [1] ; Ferreira, Karen Spadari [2] ; Martins, Joilson O. [1]
Total Authors: 6
[1] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Clin & Toxicol Anal, Lab Immunoendocrinol, FCF, Sao Paulo - Brazil
[2] Univ Fed Sao Paulo, Dept Pharmaceut Sci Anal, Lab Cellular Immunol & Biochem Fungus & Protozoa, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, AUG 7 2019.
Web of Science Citations: 0

Macrophages may be a crucial aspect of diabetic complications associated with the inflammatory response. In this study, we examined how hyperglycaemia, a common aspect of diabetes, modulates bone marrow-derived macrophages (BMDMs) under an inflammatory stimulus. To perform this study, BMDMs from non-diabetic and diabetic (60 mg/kg alloxan, i.v.) male C57BL/6 mice (CEUA/FCF/USP-488) were cultured under normal (5.5 mM) and high glucose (HG, 25 or 40 mM) conditions and stimulated or not stimulated with lipopolysaccharide (LPS, 100 ng/mL). Compared to the BMDMs from the normoglycaemic mice, the LPS-stimulated BMDMs from the diabetic mice presented reduced TLR4 expression on the cell surface, lower phagocytic capacity, and reduced secretion of NO and lactate but greater oxygen consumption and greater phosphorylation of p46 SAPK/JNK, p42 ERK MAPK, pAKT and pPKC-delta. When the BMDMs from the non-diabetic mice were cultured under high-glucose conditions and stimulated with LPS, TLR4 expression was reduced on the cell surface and NO and H2O2 levels were reduced. In contrast, the diabetic BMDMs cultured under high glucose conditions presented increased levels of lactate and reduced phosphorylation of AKT, PKC-delta and p46 SAPK/JNK but enhanced phosphorylation of the p46 subunit of SAPK/JNK after LPS stimulation. High glucose levels appear to modify macrophage behaviour, affecting different aspects of diabetic and healthy BMDMs under the same LPS stimulus. Thus, hyperglycaemia leaves a glucose legacy, altering the basal steady state of macrophages. (AU)

FAPESP's process: 17/11540-7 - Investigating the role of insulin in the presence of allergic pulmonary inflammation in diabetic and healthy mice
Grantee:Joilson de Oliveira Martins
Support type: Regular Research Grants
FAPESP's process: 14/05214-1 - Investigating the role of insulin in different infections in diabetic and healthy animals
Grantee:Joilson de Oliveira Martins
Support type: Regular Research Grants