Background: The overall goal of this study is to use a bacterial toxin as drug delivery agents for chemotherapy drugs and overcome the development of resistance to these medicines. COR-L105 and MDA-MB 231 which are epithelial-like were used in this study. Cytotoxicity assays were performed by 3-(4, 5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) as metabolic indicator. The toxin was essential to kill 50% (CT50) and IC 50 value (inhibition growth value) for methotrexate were determined as optical density at 540 nm. Epsilon toxin-loaded PLGA nanoparticles were prepared using non-aqueous technique. Surface morphology, in vitro drug release, and encapsulation efficiency of the nanoparticles was determined.
Results: Results confirmed that using non-toxic concentration of epsilon toxin, resistance to cancerous cell decreased significantly, which could be an important result in cancer therapy. The synergistic effect of MTX and epsilon toxin showed that bio toxins can be used as supplement with chemical drugs and increase the effect of chemotherapy. The results illustrated that application of PLGA as drug delivery system due to its controlled release properties was beneficial.
Conclusion: These finding proposed that due to the ease of local accessibility of lung tumors with aerosol drug delivery, biotoxins can directly be used with chemotherapy drugs in aerosol form.