Title:Apoptosis Inducing Effects of Thymus Linearis Methanolic Extract in HCT-116 Cells and LC-MS Chemical Profiling of Its Active Constituents
Volume: 12
Issue: 4
Author(s): Rohina Bashir, Ovais Zargar, Qazi Parvaiz and Rabia Hamid*
Affiliation:
- Department of Nanotechnology, University of Kashmir Hazratbal, Srinagar,
India
Keywords:
Thymus linearis, colon cancer, HEK-293, MTT, LC-MS, Bcl-2, apoptosis.
Abstract:
Background: Cancer is one of the major problems at present, to which vast research is
being dedicated to find an effective remedy. Medicinal plants are endowed with numerous
molecules that could be effective in multiple diseases including cancer. Thymus linearis, being rich
in phenols, terpenoid, and flavonoids have the potential to provide anti-cancer entities.
Methods: The extracts of Thymus linearis were investigated for in vitro anticancer activity using
MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay on a panel of cancer
cell lines. The cellular and nuclear morphology was studied using microscopic techniques. Agarose
gel electrophoresis was used for DNA fragmentation analysis. Protein expression was determined
by western blotting. LC-MS was used for phytochemical identification.
Results: Among all the extracts, Thymus linearis methanolic (TLM) extract was found to exhibit
antiproliferative activity on cell lines to varying degrees. TLM was found to be most potent against
HCT-116 with an IC50 of 158μg/ml after 48hrs treatment while being nontoxic to HEK-293 and
FR-2 cells under similar concentrations. TLM decreased clonogenic potential of HCT-116 cells. It
induced cell shrinkage, membrane blebbing and nuclear fragmentation characteristic of apoptotic
in a dose dependent manner in HCT-116 cells. Prominent internucleosomal DNA cleavage was observed
in HCT-116 cells after 48hrs TLM treatment. Western blot analysis revealed the up regulation
of expression of Bax, caspases 9 and caspases 3 and downregulation of Bcl-2 proteins. The
LC-MS data revealed the presence of Salvianolic acid H, Synparvolide C, Thymuside A and Jasmonic
acid; 12-Hydroxy, O-β-D-glucopyranoside and polyphenolic flavonoids to which antiproliferative
activity can be attributed.
Conclusion: The results suggest that Thymus linearis methanolic extract could be valuable source
of anti-cancer agents.