Exosomes from high glucose-treated macrophages activate macrophages andinduce inflammatory responses via NF-κB signaling pathway in vitro and in vivo.

Abstract:

:There is increasing evidence that macrophages play an important role in the development and pathogenesis of diabetic nephropathy (DN) by secreting inflammatory cytokines. Exosomes are a family of extracellular vesicles that are secreted from almost all types of cells and associated with cell-to-cell communications. In this article, we try to investigate whether high glucose (HG)-treated macrophages-derived exosomes could activate macrophages and induce inflammatory responses in vivo and in vitro. We incubated the exosomes from high glucose-treated Raw264.7 cells (HG-Exo) and Raw264.7 cells for 24 h. The expression levels of related inflammatory molecules and NF-κB p65 signaling pathway were identified, as well as the intracellular localization of NF-κB p65 was detected. In vivo, HG-Exo was injected into mice via tail vein and the related parameters of kidneys were detected. Compared with the exosomes from normal glucose-treated Raw264.7 cells (NG-Exo), HG-Exo contained higher concentrations of IL-1β and iNOS. HG-Exo-treated Raw264.7 cells secreted higher level of related inflammatory molecules and promoted NF-κB p65 signaling pathway expression. HG-Exo induced the production of intracellular iNOS and α-SMA. In the HG-Exo group, NF-κB p65 positive signals were mainly distributed in the nucleus area. HG-Exo treated mice kidneys displayed a significantly mesangial expansion and proliferation. NF-κB p65 protein expression levels in mice renal tissue treated with HG-Exo was significantly up-regulated. These findings suggest that high glucose treated macrophages-derived exosomes may activate macrophages and accelerate kidney injury via NF-κB p65 signaling pathway.

journal_name

Int Immunopharmacol

authors

Zhu M,Sun X,Qi X,Xia L,Wu Y

doi

10.1016/j.intimp.2020.106551

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

106551

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(20)30117-X

journal_volume

84

pub_type

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