RESUMO
Tryptanthrin is one of the most important members of indoloquinoline alkaloids. We obtained this alkaloid from Isatis. Two novel FeII and CoII complexes of tryptanthrin were first synthesized. Single-crystal X-ray diffraction analyses show that these complexes display distorted four-coordinated tetrahedron geometry via two heterocyclic nitrogen and oxygen atoms from tryptanthrin ligand. Binding with G-quadruplex DNA properties revealed that both complexes were found to exhibit significant interaction with G-quadruplex DNA. This study may potentially serve as the basis of future rational design of metal-based drugs from natural products that target the G-quadruplex DNA.
RESUMO
OBJECTIVE: To explore the effect of gallic acid extracted from Leaves of Phyllanthus emblica on the apoptosis of BEL-7404 cells. METHODS: MTT assay was applied to detect the influence on prolifetation in vitro. Inverted microscope was utilized to observe the morphological changes after BEL-7404 cells were treated with gallic acid. Annexin V/PI double label method was used to detect earlier period apoptosis cells and Tunel was applied to calculate the apoptosis rates. RESULTS: Gallic acid could restrain the BEL-7404 cells proliferation at diffierent levels in a time and concentration dependent manner. The typical morphological changes of apoptosis were observed after BEL-7404 cells were treated with gallic acid. Annexin V/PI double label method and Tunel method showed that the viable apoptotic cell and apoptosis rates added as action time prolonged. CONCLUSION: Gallic acid can restrain the BEL-7404 cells proliferation and induce apoptosis, and its effect on apoptosis is time dependent.
