Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins

James CK Lai1, Gayathri Ananthakrishnan1,2, Sirisha Jandhyam1, Vikas V Dukhande1, Alok Bhushan1, Mugdha Gokhale1, Christopher K Daniels1, Solomon W Leung31Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy and Biomedical Research Institute, 2Department of Health and Nutrition...

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Autores principales:	James CK Lai, Gayathri Ananthakrishnan, Sirisha Jandhyam, et al
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2010
Materias:	Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/f49c862dd7b64d278bc546e44c9c1bc5
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spelling	oai:doaj.org-article:f49c862dd7b64d278bc546e44c9c1bc52021-12-02T02:04:59ZTreatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins1176-91141178-2013https://doaj.org/article/f49c862dd7b64d278bc546e44c9c1bc52010-09-01T00:00:00Zhttp://www.dovepress.com/treatment-of-human-astrocytoma-u87-cells-with-silicon-dioxide-nanopart-a5330https://doaj.org/toc/1176-9114https://doaj.org/toc/1178-2013James CK Lai1, Gayathri Ananthakrishnan1,2, Sirisha Jandhyam1, Vikas V Dukhande1, Alok Bhushan1, Mugdha Gokhale1, Christopher K Daniels1, Solomon W Leung31Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy and Biomedical Research Institute, 2Department of Health and Nutrition Sciences, Kasiska College of Health Professions, 3Department of Civil and Environmental Engineering, College of Engineering and Biomedical Research Institute, Idaho State University, Pocatello, ID, USAAbstract: Recent evidence suggests silicon dioxide micro- and nanoparticles induce cytotoxic effects on lung cells. Thus, there is an increasing concern regarding their potential health hazard. Nevertheless, the putative toxicity of nanoparticles in mammalian cells has not yet been systematically investigated. We previously noted that several metallic oxide nanoparticles exert differential cytotoxic effects on human neural and nonneural cells. Therefore, we hypothesized that silicon dioxide nanoparticles induce cytotoxicity in U87 cells by lowering their survival by decreasing cell survival signaling and disturbing mitochondrial function. To investigate this hypothesis, we determined the activities of the key mitochondrial enzymes, citrate synthase and malate dehydrogenase, in astrocytoma U87 cells treated with silicon dioxide nanoparticles. In addition, we studied the expression of the mitochondrial DNA-encoded proteins, cytochrome C oxidase II and nicotinamide adenine dinucleotide (NADPH) dehydrogenase subunit 6, and cell signaling pathway protein extracellular signal-regulated kinase (ERK) and phosphorylated ERK in treated U87 cells. The activated form of ERK controls cell growth, differentiation, and proliferation. In parallel, we determined survival of U87 cells after treating them with various concentrations of silicon dioxide nanoparticles. Our results indicated that treatment with silicon dioxide nanoparticles induced decreases in U87 cell survival in a dose-related manner. The activities of citrate synthase and malate dehydrogenase in treated U87 cells were increased, possibly due to an energetic compensation in surviving cells. However, the expression of mitochondrial DNA-encoded cytochrome C oxidase subunit II and NADH dehydrogenase subunit 6 and the cell signaling protein ERK and phosphorylated ERK were altered in the treated U87 cells, suggesting that silicon dioxide nanoparticles induced disruption of mitochondrial DNA-encoded protein expression, leading to decreased mitochondrial energy production and decreased cell survival/proliferation signaling. Thus, our results strongly suggest that the cytotoxicity of silicon dioxide nanoparticles in human neural cells implicates altered mitochondrial function and cell survival/proliferation signaling.Keywords: cytotoxicity, silicon dioxide nanoparticles, mitochondrial enzyme, extracellular signaling regulated kinase, cell signaling, neural cells James CK LaiGayathri AnanthakrishnanSirisha Jandhyamet alDove Medical PressarticleMedicine (General)R5-920ENInternational Journal of Nanomedicine, Vol 2010, Iss default, Pp 715-723 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine (General) R5-920
spellingShingle	Medicine (General) R5-920 James CK Lai Gayathri Ananthakrishnan Sirisha Jandhyam et al Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
description	James CK Lai1, Gayathri Ananthakrishnan1,2, Sirisha Jandhyam1, Vikas V Dukhande1, Alok Bhushan1, Mugdha Gokhale1, Christopher K Daniels1, Solomon W Leung31Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy and Biomedical Research Institute, 2Department of Health and Nutrition Sciences, Kasiska College of Health Professions, 3Department of Civil and Environmental Engineering, College of Engineering and Biomedical Research Institute, Idaho State University, Pocatello, ID, USAAbstract: Recent evidence suggests silicon dioxide micro- and nanoparticles induce cytotoxic effects on lung cells. Thus, there is an increasing concern regarding their potential health hazard. Nevertheless, the putative toxicity of nanoparticles in mammalian cells has not yet been systematically investigated. We previously noted that several metallic oxide nanoparticles exert differential cytotoxic effects on human neural and nonneural cells. Therefore, we hypothesized that silicon dioxide nanoparticles induce cytotoxicity in U87 cells by lowering their survival by decreasing cell survival signaling and disturbing mitochondrial function. To investigate this hypothesis, we determined the activities of the key mitochondrial enzymes, citrate synthase and malate dehydrogenase, in astrocytoma U87 cells treated with silicon dioxide nanoparticles. In addition, we studied the expression of the mitochondrial DNA-encoded proteins, cytochrome C oxidase II and nicotinamide adenine dinucleotide (NADPH) dehydrogenase subunit 6, and cell signaling pathway protein extracellular signal-regulated kinase (ERK) and phosphorylated ERK in treated U87 cells. The activated form of ERK controls cell growth, differentiation, and proliferation. In parallel, we determined survival of U87 cells after treating them with various concentrations of silicon dioxide nanoparticles. Our results indicated that treatment with silicon dioxide nanoparticles induced decreases in U87 cell survival in a dose-related manner. The activities of citrate synthase and malate dehydrogenase in treated U87 cells were increased, possibly due to an energetic compensation in surviving cells. However, the expression of mitochondrial DNA-encoded cytochrome C oxidase subunit II and NADH dehydrogenase subunit 6 and the cell signaling protein ERK and phosphorylated ERK were altered in the treated U87 cells, suggesting that silicon dioxide nanoparticles induced disruption of mitochondrial DNA-encoded protein expression, leading to decreased mitochondrial energy production and decreased cell survival/proliferation signaling. Thus, our results strongly suggest that the cytotoxicity of silicon dioxide nanoparticles in human neural cells implicates altered mitochondrial function and cell survival/proliferation signaling.Keywords: cytotoxicity, silicon dioxide nanoparticles, mitochondrial enzyme, extracellular signaling regulated kinase, cell signaling, neural cells
format	article
author	James CK Lai Gayathri Ananthakrishnan Sirisha Jandhyam et al
author_facet	James CK Lai Gayathri Ananthakrishnan Sirisha Jandhyam et al
author_sort	James CK Lai
title	Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
title_short	Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
title_full	Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
title_fullStr	Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
title_full_unstemmed	Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
title_sort	treatment of human astrocytoma u87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins
publisher	Dove Medical Press
publishDate	2010
url	https://doaj.org/article/f49c862dd7b64d278bc546e44c9c1bc5
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Treatment of human astrocytoma U87 cells with silicon dioxide nanoparticles lowers their survival and alters their expression of mitochondrial and cell signaling proteins

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