ABSTRACT
The essential oil from Lippia origanoides (EOLO) is employed in traditional medicine as it has both antimicrobial and anti-inflammatory properties. The current investigation first evaluated the EOLO's cytotoxic activity in tumour (SiHa and HT-29) and non-tumour (human lymphocyte) cells by MTT. The effect on ROS production was further evaluated in cancer cells by fluorimetry. The oil's mutagenic and antifungal activities were also evaluated using, respectively, the in vitro micronucleus test and the broth microdilution method. The EOLO displayed significant cytotoxicity in both cancer cell lines, with IC50 values of 20.2 µg/mL and 24.3 µg/mL for HT-29 and for SiHa cell lines, respectively. EOLO increased ROS production, was unable to raise the micronucleus frequencies and significantly reduced the cytokinesis block proliferation indices, revealing its anti-proliferative action. The results demonstrate that EOLO is devoid of mutagenic activity but possesses significant activity against tumour and non-tumour human cells, reinforcing its biological potential.
ABSTRACT
Genotoxic effects of benznidazole were studied by the induction of homozygosis of genes previously present in heterozygous. UT448//A757 diploid strain was used in the benznidazole's recombinagenesis test. Although toxic effects on growth of colonies were not observed, 75 and 100 microM benznidazole induced an increasing of mitotic recombination events in diploid strain. Results were related to the induction of chromosomal breaks by the antiparasitic drug.
Subject(s)
Aspergillus nidulans/drug effects , Diploidy , Mutagens/toxicity , Nitroimidazoles/toxicity , Aspergillus nidulans/cytology , Aspergillus nidulans/genetics , Homozygote , Mitosis/drug effects , Mitosis/genetics , Mutagenicity TestsABSTRACT
Genotoxic effects of benznidazole were studied by the induction of homozygosis of genes previously present in heterozygous. UT448//A757 diploid strain was used in the benznidazole's recombinagenesis test. Although toxic effects on growth of colonies were not observed, 75 and 100 æM benznidazole induced an increasing of mitotic recombination events in diploid strain. Results were related to the induction of chromosomal breaks by the antiparasitic drug.
