Enhancing the circulating half-life and the antitumor effects of a tumor-selective cytotoxic peptide by exploiting endogenous serum albumin as a drug carrier

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• 作者：Tao Su¹ ; Hao Yang¹ ; Qing Fan ; Dianlong Jia ; Ze Tao ; Lin Wan ; Xiaofeng Lu ; ^{xiaofenglu@scu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ABD ; albumin-binding domain ; B28 ; BMAP28 (amino acids 1&ndash ; 18) ; BB28 ; the conjugate of bombesin and B28 ; ABB28 ; the conjugate of ABD and BB28 ; HSA ; human serum albumin ; FcRn ; the neonatal Fc receptor ; GRPR ; gastrin-releasing peptide receptor
• 刊名：International Journal of Pharmaceutics
• 出版年：2016
• 出版时间：29 February 2016
• 年：2016
• 卷：499
• 期：1-2
• 页码：195-204
• 全文大小：2940 K

文摘

The elevated expression of bombesin receptors in many of the deadliest cancers has attracted special interest in developing bombesin-directed agents for tumor imaging and therapy. Previously, we constructed the chimeric peptide BB28 by fusing bombesin to a mitochondria-disrupting peptide. BB28 selectively induced the apoptosis of various tumor cells in vitro and showed promising in vivo antitumor effects. In general, a short circulating half-life limits the in vivo effect of peptides. To prolong the half-life of BB28, here, we generated the novel peptide ABB28 by fusing an albumin-binding domain (ABD) to the N-terminus of BB28. ABB28 exhibited much higher binding affinity for albumin than BB28, and this modification extended the peptide half-life from several minutes to 2 h. Optical imaging revealed that ABB28 accumulated in xenografted tumors within 1 h post-injection and persisted at an evident level for up to 24 h. ABB28 exerted stronger tumor-suppressive effects than BB28. Significant differences in the tumor volumes (P < 0.001) and the tumor weights (P = 0.002) were observed between ABB28- and BB28-treated mice. Moreover, ABB28 exhibited tumor suppression comparable to that of PEGylated 5K-BB28 in vivo. These results suggest that half-life extension via ABD fusion represents a useful strategy for optimizing bombesin-directed pharmaceuticals for cancer-targeted therapy.