PEGylated liposomes of anastrozole for long-term treatment of breast cancer : In vitro and in vivo evaluation

Shavi, Gopal Venkatesh and Reddy, Meka Sreenivasa and Raghavendra, Ramesh and Nayak, Usha Yogendra and Kumar, Averineni Ranjith and Deshpande, Praful Balavant and Udupa, Nayanabhirama and Behl, Gautam and Dave, Vivek and Kushwaha, Kriti (2016) PEGylated liposomes of anastrozole for long-term treatment of breast cancer : In vitro and in vivo evaluation. Journal of Liposome Research, 26 (1). pp. 28-46. ISSN 0898-2104

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The aim of present study was to develop conventional and PEGylated (long circulating), liposomes containing anastrozole (ANS) for effective treatment of breast cancer. ANS is a third-generation non-steroidal aromatase inhibitor of the triazole class used for the treatment of advanced and late-stage breast cancer in post-menopausal women. Under such disease conditions the median duration of therapy should be prolonged until tumor regression ends (>31 months). Liposomes were prepared by the thin film hydration method by using ANS and various lipids such as soyaphosphatidyl choline, cholesterol and methoxy polyethylene glycol distearoyl ethanolamine in different concentration ratios and evaluated for physical characteristics, in vitro drug release and stability. Optimized formulations of liposome were studied for in vitro cytotoxic activity against the BT-549 and MCF-7 cell lines and in vivo behavior in Wistar rats. Preformulation studies, both Fourier transform infrared study and differential scanning calorimetry analysis showed no interaction between the drug and the excipients used in the formulations. The optimized formulations AL-07 and AL-09 liposomes showed encapsulation efficiencies in the range 65.12 ± 1.05% to 69.85 ± 3.2% with desired mean particle size distribution of 101.1 ± 5.9 and 120.2 ± 2.8 nm and zeta potentials of -43.7 ± 4.7 and -62.9 ± 3.5 mV. All the optimized formulations followed Higuchi-matrix release kinetics and when plotted in accordance with the Korsemeyer-Peppas method, the n-value 0.5 < n < 1.0 suggests an anomalous (non-Fickian) transport. Likewise, the PEGylated liposomes showed greater tumor growth inhibition on BT-549 and MCF-7 cell lines from in vitro cytotoxicity studies (p < 0.05). Pharmacokinetic study of conventional and PEGylated liposomes in Wistar rats demonstrated a 3.33- and 20.28-fold increase in AUC(0-∞) values when compared to pure drug (p < 0.001). Among the formulations, PEGylated liposomes showed encouraging results by way of their long circulation and sustained delivery properties for effective treatment of breast cancer.

Item Type: Article
Additional Information: Funding Information: The authors would like to acknowledge Sun Pharma, Baroda, India, for gift sample anastrozole and the All India Council for Technical Education (AICTE), Govt. of India, for providing National Doctoral Fellowship for this project. Publisher Copyright: © 2015 Informa Healthcare USA, Inc.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3000/3003
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Date Deposited: 19 Oct 2022 23:10
Last Modified: 11 Jun 2023 03:10

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