Document Detail


TiO(2) nanoparticles induce insulin resistance in liver-derived cells both directly and via macrophage activation.
MedLine Citation:
PMID:  22007682     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract Upon exposure, TiO(2) nanoparticles (NPs) have been recovered in internal organs such as the liver, and are proposed to cause cellular/organ dysfunction, particularly in the liver and lungs. We hypothesized that despite being considered "inert" as bulk material, TiO(2) NPs may impair insulin responses in liver-derived cells, either indirectly by inflammatory activation of macrophages, and/or by directly interfering with insulin signaling. Using qRT-PCR and conditioned medium (CM) approaches, we show that exposure to TiO(2) NPs activates macrophages' expression of TNF-α, IL-6, IL-8, IL-1α and IL-1β and the resulting CM induces insulin resistance in Fao cells. Furthermore, direct exposure of Fao cells to TiO(2) results in activation of the stress kinases JNK and p38MAP kinase, and in induction of insulin resistance at the signaling and metabolic levels. Collectively, our findings provide a proof-of-concept for the ability of man-made NPs to induce insulin resistance in liver-derived cells, an endocrine abnormality underlying some of the most common human diseases.
Authors:
Diana Gurevitch; Timor Shuster-Meiseles; Ori Nov; Yehiel Zick; Assaf Rudich; Yinon Rudich
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-18
Journal Detail:
Title:  Nanotoxicology     Volume:  -     ISSN:  1743-5404     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101233132     Medline TA:  Nanotoxicology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Environmental Sciences , The Weizmann Institute of Science, Rehovot , Israel.
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