In Vivo Study of mPEG-PCL as a Nanocarriers for Anti-Inflammatory Drug Delivery of Simvastatin.

PURPOSE: In this study, methoxy poly (ethylene glycol) -poly (ε-caprolactone) (mPEG-PCL) di block copolymers were synthesized. The purpose of this work is to investigate the in vivo anti-inflammatory effects of simvastatin-loaded micelles.

METHODS: The structure of synthesized copolymers were characterized by using HNMR, FTIR and GPC techniques. Simvastatin was encapsulated in micelles through a single-step nano-precipitation method, leading to formation of simvastatin-loaded mPEG-PCL (simvastatin-mPEG-PCL) micelles. In this study the anti-inflammatory effects of simvastatin/mPEG-PCL micelles versus indomethacin were investigated in acute inflammation induced rats. The paw edema thickness was measured 1, 2, 3 and 4 hours after injection of formulation. The inhibition of edema in various groups were calculated and reported by percentages.

RESULTS: The results showed that the zeta potential of micelles were about -14.9 ± 0.47 mV and the average size was in 66.10 ± 0.34 nm range. Simvastatin was encapsulated in mPEG-PCL micelles with loading capacity of 9.63 ± 0.87% and encapsulation efficiency of 64.20 ± 0.79%. Simvastatin and simvastatin-mPEG-PCL micelles showed significant anti-inflammatory activity in the present study.

CONCLUSIONS: This study revealed that simvastatin and simvastatin/mPEG-PCL micelles both have anti-inflammatory effects and suggested that statins have potential anti-inflammatory activity along with their lipid lowering properties.