JOURNAL OF PHARMACEUTICS AND DRUG RESEARCH, vol.3, no.2, pp.319-328, 2020 (Journal Indexed in ESCI)
Plants have been used to prevent or to treat some diseases for thousand of years. As resistance to antibiotic and cancer drugs
has been increasing rapidly in recent years, the scientific world has turned its focus on plants used in traditional medicine to
counteract this trend. Studies conducted with the leaves of Camellia sinensis have reported that some components in the
contents of the tea plant may have varying degrees of antimicrobial and anti-cancer activities.
The antiproliferative effects of ethyl acetate (EtOAc) extract obtained from the flowers against non-transformed and
transformed cells were evaluated with the MTT (3-[4,5-Dimethylthiazole-2-yl]-2, 5-diphenyltetrazolium bromide) assay.
Additionally, the extract’s antimicrobial activity against some gram- positive (Gr+), Gram-negative (Gr-) bacteria and
Candida spp. was investigated by an agar well diffusion assay and minimum inhibition concentration (MIC) was carried out
using the broth microdilution method.
The EtOAc extract at 200 µg/ml concentration exhibited growth ingibitory effects on all cancer cells, but had no effect on
non-transformed cells. At this concentration, the inhibitory effect on cancer cells was statistically significant (p<0.05) in
comparison to non-transformed ARPE-19 and HEL299 cell lines. However, the anti-proliferative effect at 100 µg/ml was
retained against endometrial cancer cell line (CRL-2923) only. Notably, CRL-2923 cell line was found to be susceptible to
The extract produced inhibition zones ranging from 10.0 mm to 17.3 mm for the bacteria and from 19.0 to 21.33 for yeast.
Two Gr(+) and two Gr(-) bacteria were susceptible to the extract, while the other microorganisms that were used in the study
were not affected. In particular, the most susceptible Gr (+) and Gr (-) bacteria were Staphylococcus aureus and Klebsiella
pneumoniae with MIC values of 62.25 µg/ml and 500 µg/ml, respectively. Additionally, the extract exhibited a good antifungi activity against both Candida species with the same MIC value.
Keywords: Cancer, Antimicrobial, Camellia sinensis, ARPE-19, HEL299 A549, CRL-2923, HeLa