Document Detail


Cellular internalization and stress response of ingested amorphous silica nanoparticles in the midgut of Drosophila melanogaster.
MedLine Citation:
PMID:  23046978     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Amorphous silica nanoparticles (aSNPs) are used for various applications including food industry. However, limited in vivo studies are available on absorption/internalization of ingested aSNPs in the midgut cells of an organism. The study aims to examine cellular uptake of aSNPs (< 30nm) in the midgut of Drosophila melanogaster (Oregon R(+)) owing to similarities between the midgut tissue of this organism and human and subsequently cellular stress response generated by these nanoparticles. METHODS: Third instar larvae of D. melanogaster were exposed orally to 1-100μg/mL of aSNPs for 12-36h and oxidative stress (OS), heat shock genes (hsgs), membrane destabilization (Acridine Orange/Ethidium Bromide staining), cellular internalization (TEM) and apoptosis endpoints Results A significant increase was observed in OS endpoints in the midgut cells of exposed Drosophila in a concentration- and time-dependent manner. Significantly increased expression of hsp70 and hsp22 along with caspases activation, membrane destabilization and mitochondrial membrane potential loss was also observed. TEM analysis showed aSNPs-uptake in the midgut cells of exposed Drosophila via endocytic vesicles and by direct membrane penetration. CONCLUSION: aSNPs after their internalization in the midgut cells of exposed Drosophila larvae show membrane destabilization along with increased cellular stress and cell death. General significance Ingested aSNPs show adverse effects on the cells of GI tract of the exposed organism thus their industrial use as a food-additive may raise concern to human health.
Authors:
Ashutosh Pandey; Swati Chandra; Lalit Kumar Singh Chauhan; Gopeshwar Narayan; Debapratim Kar Chowdhuri
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-6
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  -     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
Affiliation:
Embryotoxicology Section, CSIR-Indian Institute of Toxicology Research, Lucknow 226001, Uttar Pradesh, India.
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