Octreotide-periplocymarin conjugate prodrug for improving targetability and anti-tumor efficiency: synthesis, in vitro and in vivo evaluation
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Hui-Yun Zhang1,*, Wen-Qian Xu1,*, Yuan-yuan Zheng2, Emmanuel Omari-Siaw1, Yuan Zhu1, Xia Cao1, Shan-Shan Tong1, Jiang-nan Yu1,2, Xi-ming Xu1
1Department of Pharmaceutics, School of Pharmacy, Center for Nano Drug/Gene Delivery and Tissue Engineering, Jiangsu University, Zhenjiang, People’s Republic of China
2School of Pharmacy, China Pharmaceutical University, Nanjing, People’s Republic of China
*These authors contributed equally to this work
Jiang-nan Yu, email: [email protected]
Xi-ming Xu, email: [email protected]
Keywords: cardiac glycosides, periplocymarin, octreotide, targetability, octreotide- periplocymarin conjugate
Received: August 05, 2016 Accepted: November 09, 2016 Published: November 16, 2016
Cardiac glycosides could increase intracellular Ca2+ ion by inhibiting the Na+/K+ATPase to induce apoptosis in many tumor cells. However, narrow therapeutic index, poor tumor selectivity and severe cardiovascular toxicity hinder their applications in cancer treatment. To improve the safety profile and tumor targetablility of cardiac glycosides, we designed octreotide conjugated periplocymarin, a cardiac glycoside isolated from Cortex periplocae. The conjugate showed higher cytotoxicity on MCF-7 cells and HepG2 tumor cells (SSTRs overexpression) but much less toxicity in L-02 normal cells. Tissue distribution studies of the conjugate using H22 tumor model in mice showed higher accumulation in tumor and lower distribution in heart and liver than periplocymarin. Furthermore, in vivo anticancer effects of the conjugate on mice bearing H22 cancer xenografts confirmed enhanced anti-tumor efficacy and decreased systemic toxicity. Altogether, octreotide-conjugated periplocymarin demonstrated tumor selectivity and may be useful as a targeting agent to improve the safety profile of cardiac glycosides for cancer therapy.
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