In vitro and in vivo evaluation of targeting efficiency of Adriamycin hydrochloride magnetic microspheres

Abstract

The objective of this study was to prepare magnetic microspheres as a targeting drug delivery system and to specifically evaluate its targeting efficiency. The magnetic microspheres were prepared by emulsion cross-linking techniques. Targeting efficiency was specifically investigated by experiments of biodistribution on rats and histological study. Adriamycin hydrochloride (ADR)-loaded magnetic microspheres were successfully prepared with the mean diameter of 3.853 μm (± 1.484 μm), and had its speciality of superparamagnetism. The results of the targeting efficiency study showed that application of the external magnetic field significantly increased the ADR concentration from 40.28 μg/ml to 100.70 μg/ml at 10 min, 36.99 μg/ml to 91.16 μg/ml at 60 min, and 13.71 μg/ml to 28.30 μg/ml at 180 min in liver as the targeting tissue. The relative uptake efficiencies in liver by injection treatment of ADR magnetic microspheres with external magnetic field were 3.87, 5.59, and 3.34 at 10 min, 60 min, and 180 min after administration, respectively. In conclusion, distinguished targeting efficiency was displayed, which indicated that the magnetic microspheres could be applied as a novel targeting drug delivery system.

Preparation and biological characterization of pH-responsive PASP-g-PEG-DDA-Hyd-ADR

“…[1][2][3][4] However, researchers have reported that ADR demonstrates severe cardiac toxicity due to the poor specificity in reaching tumor tissue. To enhance tumor targeting, alleviate toxic side effects and improve the water solubility, nanospheres and microspheres, [5][6][7] liposomal systems, 8 and polymeric micelle systems 9,10 have demonstrated encouraging results to reduce cytotoxicity and increase the in vivo half-life. Out of the three systems mentioned above, the polymeric micelles have turned out to be one type of promising biomedical material which can be used in the development of an ADR delivery system.…”