The authors would like to acknowledge Stem Cell Technology and Shahid Ghazi Tabriz companies respectively for providing DMEM without phenol red and sterile water for injection as gifts.

MCF-7 seeding in 96-well plate:
MCF-7 cells were cultured in 25 t-flask in medium containing Dulbecco&rsquo;s Modified Eagle&rsquo;s Medium (DMEM), 10% FBS, 100 U/ml penicillin, and 100 &mu;g/ml streptomycin at 37&deg;C with 5% CO2, 95% air and complete humidity. Once reached ~90% confluency, they were detached using 0.05% trypsin/EDTA and counted by means of trypan blue and hemocytometer. These cells were then resuspended at a concentration of 4&times;104 cells/cm2 and added onto 96-well plate (i.e., 250 &mu;l/well) by an 8-channel pipette. For background absorption, some wells were remained cell-free, i.e. as blank control.
Treating cells with different nanopolyplexes:
At 40-50% confluency (48 hours post seeding), the cultivated cells were treated with nanostructured starburst polyamidoamine dendrimers (i.e., Superfect&reg; and Polyfect&reg;) and a novel test polymer following the transfection instruction provided by supplier. Cells were also treated with EGFR and scrambled antisense alone, and with the three different nanopolyplexes of these two oligonucleotides and with polymers (n=4). Four wells were remained untreated as control. After 4 hours the treatment media were removed and replenished with fresh media.
MTT assay for evaluating cell viability:
MTT assay was performed 24 hours after transfection. For this purpose, MTT solution was prepared at 1mg/ml in PBS and was filtered through a 0.2 &micro;m filter. Then, 50 &micro;l of MTT plus 200 &micro;l of DMEM without phenol red were added into each well, except the cell-free blank wells. Cells were incubated for 4 hours at 37&deg;C with 5% CO2, 95% air and complete humidity. After 4 hours, the MTT solution was removed and replaced with 200 &micro;l of DMSO and 25&micro;l Sorenson&rsquo;s glycine buffer (glycine 0.1M, NaCl 0.1M, pH:10.5 with 0.1 NaOH). The plate was further incubated for 5 min at room temperature, and the optical density (OD) of the wells was determined using a plate reader at a test wavelength of 570 nm and a reference wavelength of 630 nm.

<ol>
	<li>Plumb, J. A., Milroy, R., Kaye, S. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+the+pH+Dependence+of+3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium+Bromide-Formazan+Absorption+on+Chemosensitivity+Determined+by+a+Novel+Tetrazolium-based+Assay.">Effects of the pH Dependence of 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium Bromide-Formazan Absorption on Chemosensitivity Determined by a Novel Tetrazolium-based Assay.</a> Cancer Research. 49, 4435-4435 (1989).</li><li>Mosmann, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+Colorimetric+Assay+for+Cellular+Growth+and+Survival:+Application+to+Proliferation+and+Cytotoxicity+Assays.">Rapid Colorimetric Assay for Cellular Growth and Survival: Application to Proliferation and Cytotoxicity Assays.</a> Journal of Lmmunological Methods. 65, 55-55 (1983).</li><li>Yang, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Energy+and+Redox+States+in+the+C6+Glioma+Cells+Following+Acute+Exposure+to+Zn,+Se++4+,+and+Se++6+and+the+Correlation+with+Apoptosis.">Energy and Redox States in the C6 Glioma Cells Following Acute Exposure to Zn, Se +4 , and Se +6 and the Correlation with Apoptosis.</a> Toxicology Mechanisms and Methods. 16 (1), 13-13 (2006).</li><li>Spinner, D. M., Bartlett, J. M. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> MTT Growth Assays in Ovarian Cancer, in Ovarian Cancer: Methods and Protocols. , 175-177 (2000).</li></ol>

The MTT assay is deemed to be a versatile method and accordingly the viability of the cells could be evaluated upon various treatments. The production of resultant formazan appears to be proportional to the level of energy metabolism in the cells. Therefore, it is possible to measure the metabolically activated cells even in the absence of cell proliferation. The amount of formazan produced is proportional to the amount of MTT in the incubation medium. While, the concentration of MTT which is required to achieve maximum ...

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		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>25 t-flask</td>
<td>&nbsp;</td>
<td>Orange Scientific</td>
<td>5510100</td>
<td>&nbsp;</td>
<tr>
<td>PBS</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>P3813</td>
<td>&nbsp;</td>
<tr>
<td>Dulbecco&#x2019;s Modified Eagle&#x2019;s Medium - high glucose</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>D5671</td>
<td>&nbsp;</td>
<tr>
<td>MTT</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>M2128</td>
<td>&nbsp;</td>
<tr>
<td>FBS</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>F2442</td>
<td>&nbsp;</td>
<tr>
<td>Penicillin 200,000 u/ml</td>
<td>&nbsp;</td>
<td>CinnaGen</td>
<td>CR7913</td>
<td>&nbsp;</td>
<tr>
<td>Streptomycin 200 mg/ml</td>
<td>&nbsp;</td>
<td>CinnaGen</td>
<td>CR7912</td>
<td>&nbsp;</td>
<tr>
<td>trypsin/EDTA</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>T3924</td>
<td>&nbsp;</td>
<tr>
<td>trypan blue</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>T8154</td>
<td>&nbsp;</td>
<tr>
<td>Superfect</td>
<td>&nbsp;</td>
<td>Qiagen</td>
<td>301105</td>
<td>&nbsp;</td>
<tr>
<td>Polyfect</td>
<td>&nbsp;</td>
<td>Qiagen</td>
<td>301305</td>
<td>&nbsp;</td>
<tr>
<td>EGFR antisense</td>
<td>&nbsp;</td>
<td>MWG biotech</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Scrambled antisense</td>
<td>&nbsp;</td>
<td>MWG biotech</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>DMEM without phenol red</td>
<td>&nbsp;</td>
<td>Gibco</td>
<td>11880</td>
<td>&nbsp;</td>
<tr>
<td>Glycine</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>G8898</td>
<td>&nbsp;</td>
<tr>
<td>hemocytometer</td>
<td>&nbsp;</td>
<td>HBG </td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>8-channel pipette</td>
<td>&nbsp;</td>
<td>TreffLab Transferpette</td>
<td>96.9918.10.1</td>
<td>&nbsp;</td>
<tr>
<td>Disposable syringe filter </td>
<td>&nbsp;</td>
<td>IWAKI</td>
<td>2052-025</td>
<td>&nbsp;</td>
<tr>
<td>Plate reader equipped with 570 nm &630 nm filters </td>
<td>&nbsp;</td>
<td>Biotek ELx808</td>
<td>ELX808</td>
<td>&nbsp;</td>
<tr>
<td>96-well plate with lid (flat bottom)</td>
<td>&nbsp;</td>
<td>IWAKI</td>
<td>3860-096</td>
<td>&nbsp;</td>
<tr>
<td>Laminar flow hood</td>
<td>&nbsp;</td>
<td>Esco class II Biosafety Cabinet</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>CO2 Incubator</td>
<td>&nbsp;</td>
<td>ASTEC</td>
<td>&nbsp;</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

cellular toxicity of nanogenomedicine in mcf-7 cell line: mtt assay

Cytotoxicity of the futuristic nanogenomedicine (e.g., short interfering RNA and antisense) may hamper its clinical development. Of these, the gene-based medicine and/or its carrier may elicit cellular toxicity. For assessment of such cytotoxicity, a common methodology is largely dependent upon utilization of the 3-(4, 5-Dimethyl-2-thiazolyl)-2, 5-diphenyl-2H-tetrazolium bromide (MTT) assay which has been widely used as a colorimetric approach based on the activity of mitochondrial dehydrogenase enzymes in cells. In this current investigation, MCF-7 cells were inoculated in 96-well plate and at 50% confluency they were treated with different nanopolyplexes and subjected to MTT assay after 24 hours. Water soluble yellow MTT is metabolized by the metabolically active cells to the water insoluble purple formazan, which is further dissolved in dimethylsulfoxide and Sornson s buffer pH 10.5. The resultant product can be quantified by spectrophotometry using a plate reader at 570 nm.

Watch this Scientific Journal Video about Cellular Toxicity of Nanogenomedicine in MCF-7 Cell Line: MTT assay at JoVE.com

Cellular Toxicity of Nanogenomedicine in MCF-7 Cell Line: MTT assay

The MTT assay is an easy and reproducible colorimetric assay for evaluation of cell viability based on reduction of yellow MTT and production of water insoluble purple formazan. Here, the viability of MCF-7 cells upon treatment of nanogenomedicine has been evaluated.

Cytotoxicity of the futuristic nanogenomedicine (e.g., short interfering RNA and antisense) may hamper its clinical development. Of these, the gene-based ...

cellular-toxicity-of-nanogenomedicine-in-mcf-7-cell-line-mtt-assay

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44.4K Views.  Tabriz University (Medical Sciences). The MTT assay is an easy and reproducible colorimetric assay for evaluation of cell viability based on reduction of yellow MTT and production of water insoluble purple formazan. Here, the viability of MCF-7 cells upon treatment of nanogenomedicine has been evaluated.