In vivo murine breast cancer targeting by magnetic iron nanoparticles involving L. GG cytoplasmic fraction

Objective(s): Use of chemical anti-cancer drugs frequently creates serious side effects. However, probiotics are natural and treat different kinds of cancer without undesired effects. Materials and Methods: In this study, a nano delivery system was planned to transport the Lactobacillus rhamnosus GG (L. GG) cytoplasmic fraction (Cf) to cancerous tissue in a mouse model. Magnetic iron nanoparticles (MINPs) were synthesized and loaded with L. GG-Cf(0, 0.312, 0.625, 1.25, and 2.5 mg/ ml) and were administrated for three weeks to treat experimentally induced murine breast cancer in a constant magnetic field. At the end of the trial, the treating efficacy of this complex molecule was evaluated via western blotting, immunohistochemistry, and qPCR. Results: Results showed that MINPS can deliver and accumulate L. GG-Cf in cancer tissue, and reduce the size and volume of the tumors. Additionally, in cancer tissues of treated mice with 2.5 mg/ml of Cf-MINPs, significantly induced apoptosis was seen compared with untreated mice (control), and our data proved that this induction may be due to the caspase-3 pathway. Conclusion: L. GG-Cf could treat murine breast cancer, and MINPs are a suitable candidate for drug delivery because of their safety, uniformity, and magnetic properties.