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Fatty acids induce increased granulocyte macrophage-colony stimulating factor secretion through protein kinase C-activation in THP-1 macrophages

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Lipids

Abstract

Insulin resistance and type 2 diabetes are associated with elevated circulating levels of nonesterified FA (NEFA) and lipoprotein remnants. The dyslipidemia is an important contributor to the excess arterial disease associated with insulin resistance and type 2 diabetes, but the mechanisms involved are elusive. In the present study we examined the effect of NEFA on macrophages. For this purpose, we utilized human macrophages, prepared by treating THP-1 monocytes with phorbol ester. We found that albumin-bound NEFA at physiological levels increase the secretion of granulocyte macrophage-colony stimulating factor (GM-CSF) by the THP-1 macrophages in a dose-dependent manner. The effect was registered as an increase in mRNA, and the amount of GM-CSF secreted correlated with the accumulation of TAG and DAG in the cell. The NEFA-induced rise in GM-CSF appeared to be mediated by activation of protein kinase C, probably acting on extracellular signal-regulated kinases 1 and 2 and being calcium dependent. We speculate that increased secretion of GM-CSF by resident macrophages in the intima exposed chronically to high levels of NEFA, such as those present in insulin resistance, may contribute to a proatherogenic response of arterial cells.

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Abbreviations

Anti-phospho-JNK:

anti-phospho-Jun Amino-terminal activated kinase

BIM:

bisindolylmaleimide 1

ECL:

enhanced chemiluminescence

ERK:

extracellular signal-regulated kinase

G3PDH:

glyceraldehyde-3-phosphate dehydrogenase

GM-CSF:

granulocyte macrophage-colony stimulating factor

HRP:

horseradish peroxidase

JNK:

Jun amino-terminal activated kinase

MAP:

kinase, mitogen-activated protein kinase

M-CSF:

macrophage-colony stimulating factor

MEK:

MAP kinase/ERK kinase

MEK 1/2:

MAP kinase kinase

NEFA:

nonesterified fatty acids

nifedipine:

1,4-dihydro-2,6-dimethyl-4-(2-nitrophenyl)-3,5-pyridinedicarboxylic acid dimethyl ester

PD 098059:

2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one

PKC:

protein kinase C

PMA:

phorbol myristate acetate

RT:

reverse transcriptase

SAPK:

stress-activated protein kinase

TBS-T:

5% nonfat dried milk in 20 mM Tris, pH 7.6, 138 mM NaCl, and 0.1% Tween-20

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Correspondence to Urban Olsson.

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Bahramian, N., Östergren-Lundén, G., Bondjers, G. et al. Fatty acids induce increased granulocyte macrophage-colony stimulating factor secretion through protein kinase C-activation in THP-1 macrophages. Lipids 39, 243–249 (2004). https://doi.org/10.1007/s11745-004-1226-2

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  • DOI: https://doi.org/10.1007/s11745-004-1226-2

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