Department cf Biology Faculty of Science University of Guilarij Rasht 64891 Iran;
Center for Nanotechnology in Drug Delivery Shiraz University of Medical Sciences Shiraz 71345 IranSchool of Pharmacy Shiraz University of Medical Sciences Shiraz 71345 Iran;
Center for Nanotechnology in Drug Delivery Shiraz University of Medical Sciences Shiraz 71345 Iran;
MicroRNA; PEI nanogels; Anti-miR-21; Gene delivery; Cisplatin resistance;