جستجوی مقالات مرتبط با کلیدواژه « cytotoxic activity » در نشریات گروه « زیست شناسی »

Despite a long history of medicinal use of Lepdium vesicarium, the phenolic compounds and biological activity studies have not been performed on different organs of the plant. So, after obtaining methanolic extract of the different organs (root, leave, stem, branch, and seed), the total phenolic and flavonoid contents were assayed by spectrophotometric methods, and antioxidant and cytotoxic properties were evaluated by DPPH and MTT methods, respectively, and then free and esterified phenolic acids were analyzed by HPLC. According to the results, the methanolic extracts of seed and leaf had the highest total phenolic content, and the maximum flavonoid content was related to the stem and seed extracts. The investigation of antioxidant and cytotoxic activity against MCF-7 cells showed that the highest antioxidant activity was related to the methanolic extract of seed, and the extracts of stem and seed had the highest cytotoxic activity. The results of phenolic acids analysis indicated that caffeic acid with the amounts of 1.44±0.16 and 1.11±0.09 mg/g dry weight was the main free phenolic acids in the leaf and branch extracts, respectively. Also, salycilic acid and m-coumaric acid with the amounts of 0.98±0.07 and 0.95±0.07 mg/g dry weight were the predominant esterified phenolic acid in the root and branch extracts, respectively. Therefore, based on the results, the seeds have the highest phenolic compounds, including caffeic, ferulic and gallic acids and due to its high antioxidant potential and cytotoxicity, it can be used in the pharmaceutical and food industries.

Bracket fungi are the most important macroscopic fungi that play a main role in the ecosystem. In this study, the morphological characters of Cerrena unicolor were evaluated and then, the effect of different solvents (n-Hexan, Dichloromethane, Ethyl acetate, and Methanol) on the extraction of phenolic compounds, antioxidant properties, and cytotoxic activities of the extracts were investigated. Total phenol and flavonoid content, phenolic acid analysis, antioxidant properties, and cytotoxic activities on MCF-7 cells were evaluated by spectrophotometry, HPLC, DPPH, and MTT methods, respectively. The obtained results showed the basidiocarp was semicircular and wavy, and the upper surface was covered with small white to grayish brown hairs. Basidia were 25 µm in length, calvate and including 4 sterigmata with ellipsoid basidiospores. The results also indicated that the Methanolic extract had the highest total phenol and flavonoid contents compared with other extracts. Moreover,Benzoic acid, Protocatechuic acid, Gallic acid, and Cinnamic acid were the main phenolic acids of the Methanolic and Ethyl acetate extracts. In addition, the Methanolic extract showed the highest antioxidant activity in inhibiting DPPH radicals, while the Methanolic and Ethyl acetate extracts indicated the highest cytotoxic activity on MCF-7 cells. Therefore the Methanolic extract due to phenolic compounds could be proposed as a new sourceofnatural antioxidants with cytotoxic activity.

Screening bacteria for bioactive compounds is the first step in the drug discovery programs. The aim of the present research was to achieve cytotoxic and antioxidant metabolites from actinobacteria of Persian Gulf sediments and to investigate the effects of combinations of seven treatments and six isolation media on the selective isolation process. A total of 395 actinobacterial isolates were collected from 12 sediment samples. Heat treatment and M6 medium were exhibited maximum efficiency of 34.59% and 32.82% isolation, respectively. Preliminary characterization results revealed the dominant distribution of Streptomyces like isolates in all investigated stations. Streptomyces isolates distribution followed a depth dependent frequency pattern. Approximately, 27.45% of the examined isolates could scavenge 90% of DPPH radicals in 1250 µg/ml final concentration. Exudated metabolites of potent isolates could scavenge DPPH radicals with IC50 ranges from 411 to 670 µg/ml. The results of cytotoxic activity showed that 54.9% of examined isolates exhibited LC50 lower than 1000µg/mL against Artemia cells. Extracted metabolites from 12 potent isolates exhibited LC50 range from 236.3 to 565.3 µg/ml. These results suggest the widespread distribution of the antioxidant and cytotoxic producing actinobacteria in Persian Gulf sediments and represent actinobacterial isolates as promising candidates for the discovery of microbial derived bioactive compounds.

Due to the abundance of Holothurialeucospilota in the Persian Gulf and cytotoxic properties of their synthesized terpenoid compounds, in this study, we examined the cytotoxic effect of lanosterol from triterpenoids. The sea cucumber muscle samples were dried and extracted with acetone. The extract was semi purified by silica gel column chromatography using n-hexane and ethyl acetate to get lanosterol. The cytotoxic effect of lanosterol checked by using XTT assay on oral epithelial cancer cell (KB/C152) and human embryonic kidney cells (Hek293) cell lines. The IC50 value of lanosterol extracted from sea cucumber muscle in KB/C152 cell line was 6.36µg/mL but it was not toxic to Hek293 cell lines. The study demonstrated that extracted lanosterol from H.leucospilota muscle had strong cytotoxic effects that can be used as an anticancer drug.