Archive \ Volume.11 2020 Issue 1

The Effect of Titanium Dioxide Nanoparticles Synthesized by Bacillus tequilensis on clb Gene Expression of Colorectal Cancer-causing Escherichia coli

Hamideh Babaei , Abbas Akhavan Sepahy* , Kiuomars Amini , Sara Saadatmand
  1. PhD Student Microbiology, Department of Microbiology, Faculty of Basic Science, Science and Research Branch, Islamic Azad University, Tehran, Iran.
  2. Associate Professor of Microbiology, Department of Microbiology, Faculty of Basic Science, North Tehran Branch, Islamic Azad University, Tehran, Iran.
  3. Associate Professor of Microbiology, Department of Microbiology, Faculty of Basic Science, Saveh Branch, Islamic Azad University, Saveh, Iran.
  4. Associate Professor of Biology, Department of Biology, Faculty of Basic Science, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Abstract

Objective: The incidence of colorectal cancer has increased dramatically in recent years. One of the most important causes of colorectal cancer is infection with a specific type of Escherichia coli bacterium that has polyketide synthase (pks) gene, which produces a secreted toxin named colibactin that changes intestinal microflora condition for its pathogenicity and by interrupting the cell cycle triggers the development of colorectal cancer. Due to the drug resistance of this bacterium, it is necessary to produce new antimicrobial agents such as nanoparticles. Therefore, this study aimed to investigate the effect of titanium dioxide nanoparticles on the expression of clb genes of E. coli responsible for colorectal cancer. Methods: The synthesis of titanium dioxide nanoparticles was done by Bacillus tequilensis that was identified by sequencing 16S rRNA. Titanium dioxide nanoparticles were examined by ultraviolet spectroscopy, X-ray diffraction, infrared spectroscopy, and scanning electron microscopy Real-Time PCR was used to analyze the effect of nanoparticles on clb expression. Human embryonic kidney cells 293 (HEK 293) cell line was treated with different concentrations of titanium dioxide nanoparticles for 72 hours and then cell viability and cytotoxicity were determined MTT method. Results: The synthesized nanoparticles were often spherical between 35.76-78.17 nm with absorption at 350 nm. RT PCR showed a 20-fold reduction in the expression of clbB and clbN genes.  MTT showed that cell viability, increased after 72 hours that depends on titanium dioxide concentration. Conclusion: The results obtained in this study indicate that the synthesized nanoparticles could reduce the expression of clbB and clbN genes of E. coli with the lowest cytotoxicity. Therefore, it can be considered for the treatment of colon cancer caused by clb gene-positive E. coli.



How to cite:
Vancouver
Babaei H, Sepahy AA, Amini K, Saadatmand S. The Effect of Titanium Dioxide Nanoparticles Synthesized by Bacillus tequilensis on clb Gene Expression of Colorectal Cancer-causing Escherichia coli. Arch Pharm Pract. 2020;11(1):22-31.
APA
Babaei, H., Sepahy, A. A., Amini, K., & Saadatmand, S. (2020). The Effect of Titanium Dioxide Nanoparticles Synthesized by Bacillus tequilensis on clb Gene Expression of Colorectal Cancer-causing Escherichia coli. Archives of Pharmacy Practice, 11(1), 22-31.

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