کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2599116 1133183 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanistic study on the biological effects of silver and gold nanoparticles in Caco-2 cells – Induction of the Nrf2/HO-1 pathway by high concentrations of silver nanoparticles
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست بهداشت، سم شناسی و جهش زایی
پیش نمایش صفحه اول مقاله
Mechanistic study on the biological effects of silver and gold nanoparticles in Caco-2 cells – Induction of the Nrf2/HO-1 pathway by high concentrations of silver nanoparticles
چکیده انگلیسی


• AgNPs but not AuNPs induced acute cytotoxicity via oxidative stress-related pathway.
• Nrf2/HO-1 induction plays an important role in response to AgNP-induced toxicity in Caco-2 cells.
• AgNPs-induced HO-1 expression depended on Nrf2 activation pathway in Caco-2 cells.
• HO-1 transcripts may be useful as a sensitive marker for safety evaluation of AgNPs in GI tract.

The most commonly used metal nanoparticles (NPs) across diverse applications, including in agro-food applications, include silver (AgNPs) and gold (AuNPs). In the present study, we aimed to investigate the biological responses and possible toxicological effects of AgNPs and AuNPs in the Caco-2 cells as an in vitro human GI tract model. Both AgNPs and AuNPs were internalized into the cytoplasm of Caco-2 cells, but not within the nucleus and only exposure to high concentrations of AgNPs, but not AuNPs, caused acute cytotoxicity and depolarization of the mitochondrial membrane potential. In addition, only AgNPs significantly depleted the total intracellular glutathione level, induced the activation of the stress-responsive gene, Nrf2, and dramatically increased the expression of heme oxygenase-1 (HO-1). Furthermore, siRNA silencing of Nrf2 transcripts significantly reduced the AgNP-induced HO-1 mRNA induction, suggesting a key role for Nrf2 in the control of HO-1 expression. Taken together, AgNPs but not AuNPs induced acute cytotoxicity and cellular responses via the oxidative stress-related activation of Nrf2/HO-1 signaling pathway in Caco-2 cells. The expression of HO-1 transcripts may be useful as a sensitive marker for safety evaluation of AgNPs in the GI tract of humans.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Toxicology Letters - Volume 224, Issue 1, 3 January 2014, Pages 73–83
نویسندگان
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