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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Sci+Rep
2016 ; 6
(ä): 26162
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Endocytosis of indium-tin-oxide nanoparticles by macrophages provokes pyroptosis
requiring NLRP3-ASC-Caspase1 axis that can be prevented by mesenchymal stem
cells
#MMPMID27194621
Naji A
; Muzembo BA
; Yagyu K
; Baba N
; Deschaseaux F
; Sensebé L
; Suganuma N
Sci Rep
2016[May]; 6
(ä): 26162
PMID27194621
show ga
The biological effects of indium-tin-oxide (ITO) are of considerable importance
because workers exposed to indium compounds have been diagnosed with interstitial
lung disease or pulmonary alveolar proteinosis; however, the pathophysiology of
these diseases is undefined. Here, mice intraperitoneally inoculated with
ITO-nanoparticles (ITO-NPs) resulted in peritonitis dependent in NLRP3
inflammasome, with neutrophils recruitment and interleukin-1? (IL-1?) production.
Withal peritoneal macrophages exposed ex vivo to ITO-NPs caused IL-1? secretion
and cytolysis. Further, alveolar macrophages exposed to ITO-NPs in vitro showed
ITO-NP endocytosis and production of tumor necrosis factor-? (TNF-?) and IL-1?,
ensued cell death by cytolysis. This cell death was RIPK1-independent but
caspase1-dependent, and thus identified as pyroptosis. Endocytosis of ITO-NPs by
activated THP-1 cells induced pyroptosis with IL-1?/TNF-? production and
cytolysis, but not in activated THP-1 cells with knockdown of NLRP3, ASC, or
caspase1. However, exposing activated THP-1 cells with NLRP3 or ASC knockdown to
ITO-NPs resulted in cell death but without cytolysis, with deficiency in
IL-1?/TNF-?, and revealing features of apoptosis. While, mesenchymal stem cells
(MSCs) co-cultured with macrophages impaired both inflammation and cell death
induced by ITO-NPs. Together, our findings provide crucial insights to the
pathophysiology of respiratory diseases caused by ITO particles, and identify
MSCs as a potent therapeutic.