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2015 ; 6
(1
): e1613
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Interaction of differentiated human adipocytes with macrophages leads to
trogocytosis and selective IL-6 secretion
#MMPMID25611388
Sárvári AK
; Doan-Xuan QM
; Bacsó Z
; Csomós I
; Balajthy Z
; Fésüs L
Cell Death Dis
2015[Jan]; 6
(1
): e1613
PMID25611388
show ga
Obesity leads to adipose tissue inflammation that is characterized by increased
release of proinflammatory molecules and the recruitment of activated immune
cells. Although macrophages are present in the highest number among the immune
cells in obese adipose tissue, not much is known about their direct interaction
with adipocytes. We have introduced an ex vivo experimental system to
characterize the cellular interactions and the profile of secreted cytokines in
cocultures of macrophages and human adipocytes differentiated from either
mesenchymal stem cells or a preadipocyte cell line. As observed by time-lapse
microscopy, flow, and laser-scanning cytometry, macrophages phagocytosed bites of
adipocytes (trogocytosis), which led to their de novo, phagocytosis and
NF-?B-dependent synthesis, then release of interleukin (IL)-6 and monocyte
chemoattractant protein (MCP)-1. IL-6 secretion was not accompanied by secretion
of other proinflammatory cytokines, such as tumor necrosis factor (TNF)-? and
IL-8, except MCP-1. LPS-induced release of TNF-?, IL-8 and MCP-1 was decreased in
the presence of the differentiated adipocytes but the IL-6 level did not subside
suggesting that phagocytosis-dependent IL-6 secretion may have significant
regulatory function in the inflamed adipose tissue.