Microbiology
Razieh Sadati; Nima Shaykh-Baygloo; Rasoul Shokri
Volume 14, Issue 9 , September 2023, , Pages 515-523
Abstract
Isolation of new microbial species from extreme environments is one of the most efficient approaches for the development of novel bioactive metabolites. The aim of the present study was to explore the pharmaceutical bacterial resources from the water and sediments of hypersaline Lake Urmia. Using different ...
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Isolation of new microbial species from extreme environments is one of the most efficient approaches for the development of novel bioactive metabolites. The aim of the present study was to explore the pharmaceutical bacterial resources from the water and sediments of hypersaline Lake Urmia. Using different culture conditions and media led to the isolation of 20 bacterial strains. Halophilic bacteria were screened for the production of antibacterial agent against multi-drug resistant strains of Escherichia coli through agar well diffusion assay. Halophilic bacteria DNA extraction was done by boiling method. The results showed that two Halomonas strains, LUH16 and LUH20 identified by analysis of 16S rRNA gene sequences were the potent producers of antimicrobial metabolites against various strains of E. coli. Furthermore, gas chromatography-mass spectrometry (GC-MS) analysis revealed the presence of eight secondary metabolites with the relevant antimicrobial properties. Our findings led us to focus on Halomonas strains as potent producers of antimicrobial compound that might be an alternative against antibiotic-resistant pathogens such as pathogenic Escherichia coli.
Vali Abdoli; Roya Sarkhosh-Inanlou; Nowruz Delirezh; Safiyeh Aghazadeh; Nima ShaykhBaygloo; Mehdi Imani
Volume 12, Issue 4 , December 2021, , Pages 481-485
Abstract
Chronic myelogenous leukemia (CML) is one of prevalent cancer worldwide. In spite of various designed drugs, chemoresistance remains the main obstacle in cancer cure. Therefore, developing novel strategy for treatment of CML is an urgent need. Fragaceatoxin C (FraC) is novel protein toxin from a ...
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Chronic myelogenous leukemia (CML) is one of prevalent cancer worldwide. In spite of various designed drugs, chemoresistance remains the main obstacle in cancer cure. Therefore, developing novel strategy for treatment of CML is an urgent need. Fragaceatoxin C (FraC) is novel protein toxin from a sea anemone called actinia fragacea with great impacts against cells by pore formation and disturbing cell membrane integrity. The aim of this study was evaluation of FraC toxin toxicity against K562. The bacteria cells harboring expression vector of FraC were induced by IPTG and purified by Ni2+-NTA sepharose affinity chromatography. Then, purified toxin activity was evaluated using RBC hemolytic test. Eventually, evaluation of FraC cytotoxicity and apoptosis were performed using MTT and flow cytometery assays, respectively. Our results revealed that FraC toxin decreased K562 cells viability in a dose- and time-dependent manner with a whole destroy of cancer cells at 35.00 µg mL-1 after 72 hr. Furthermore, flow cytometery analysis indicated that FraC toxin enhanced necrosis along with apoptosis in K562 cells in a dose dependent manner. We speculated that FraC toxin could be considered as a novel candidate for cancer cell researches and treatments provided that it should be turned into a specific agent by engineering and directing to cancer cell membrane.
