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Activation of J774.1 murine macrophages by lactate dehydrogenase

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Abstract

We have already reported that lactate dehydrogenase (LDH) activates lymphocytes in vitro and in vivo. In this paper, we report the activating effects of LDH on the macrophage-like cell line J774.1. LDH was found to enhance production of IL-6 and TNF-α by J774.1 cells in a dose-dependent manner. Transcription levels of IL-6 and TNF-α in J774.1 cells were also enhanced by supplementation with LDH. From immunoblot analysis, it was revealed that LDH enhances the phosphorylation level of JNK in J774.1 cells. Moreover, the JNK inhibitor SP600125 decreased production of IL-6 and TNF-α induced by LDH. NF-κB translocation to the nucleus was also facilitated by LDH. These results was revealed that LDH enhances production of IL-6 and TNF-α by J774.1 cells via the increase of JNK phosphorylation and NF-κB translocation to the nucleus. Our data indicated that macrophages may be activated by LDH released from damaged tissues and cells in our body.

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Abbreviations

AP-1:

Activator protein-1

ELISA:

Enzyme-linked immunosorbent assay

FBS:

Fetal bovine serum

HRP:

Horseradish peroxidase

Ig:

Immunoglobulin

IκB:

Inhibitor of NF-κB

IL:

Interleukin

JNK:

C-Jun NH2-terminal kinase

LDH:

Lactate dehydrogenase

LPS:

Lipopolysaccharide

MAPK:

Mitogen-activated protein kinase

NaPB:

Sodium phosphate buffer

NF-κB:

Nuclear factor-κB

SD:

Standard derivation

TBS-T:

Tris-buffered saline with 0.1 % Tween 20

TLR:

Toll-like receptor

TNF:

Tumor necrosis factor

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Correspondence to Takuya Sugahara.

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Daifuku, M., Nishi, K., Okamoto, T. et al. Activation of J774.1 murine macrophages by lactate dehydrogenase. Cytotechnology 66, 937–943 (2014). https://doi.org/10.1007/s10616-013-9646-3

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  • DOI: https://doi.org/10.1007/s10616-013-9646-3

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