Gülçür Ece, Thaqi Mentor, Khaja Fatima, Kuzmis Antonina, Önyüksel Hayat
Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL 60612, USA.
Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA.
Drug Deliv Transl Res. 2013 Dec;3(6). doi: 10.1007/s13346-013-0167-6.
Breast cancer is a leading cause of cancer deaths among women in the US, with 40 % chance of relapse after treatment. Recent studies outline the role of cancer stem cells (CSCs) in tumor initiation, propagation, and regeneration of cancer. Moreover, it has been established that breast CSCs reside in a quiescent state that makes them more resistant to conventional cancer therapies than bulk cancer cells resulting in tumor relapse. In this study, we establish that CSCs are associated with the overexpression of vasoactive intestinal peptide (VIP) receptors which can be used to actively target these cells. We investigated the potential of using a novel curcumin nanomedicine (C-SSM) surface conjugated with VIP to target and hinder breast cancer with CSCs. Here, we formulated, characterized, and evaluated the feasibility of C-SSM nanomedicine in vitro. We investigated the cytotoxicity of C-SSM on breast cancer cells and CSCs by tumorsphere formation assay. Our results suggest that curcumin can be encapsulated in SSM up to 200 μg/ml with 1 mM lipid concentration. C-SSM nanomedicine is easy to prepare and maintains its original physicochemical properties after lyophilization, with an IC50 that is significantly improved from that of free curcumin (14.2±1.2 vs. 26.1±3.0 μM). Furthermore, C-SSM-VIP resulted in up to 20 % inhibition of tumorsphere formation at a dose of 5 μM. To this end, our findings demonstrate the feasibility of employing our actively targeted nanomedicine as a potential therapy for CSCs-enriched breast cancer.
乳腺癌是美国女性癌症死亡的主要原因,治疗后有40%的复发几率。最近的研究概述了癌症干细胞(CSCs)在肿瘤起始、增殖和癌症再生中的作用。此外,已经确定乳腺CSCs处于静止状态,这使得它们比大量癌细胞对传统癌症治疗更具抗性,从而导致肿瘤复发。在本研究中,我们确定CSCs与血管活性肠肽(VIP)受体的过表达相关,该受体可用于主动靶向这些细胞。我们研究了使用与VIP表面共轭的新型姜黄素纳米药物(C-SSM)靶向并抑制含有CSCs的乳腺癌的潜力。在此,我们制备了C-SSM纳米药物,对其进行了表征,并评估了其体外可行性。我们通过肿瘤球形成试验研究了C-SSM对乳腺癌细胞和CSCs的细胞毒性。我们的结果表明,在脂质浓度为1 mM时,姜黄素可以以高达200 μg/ml的浓度包封在SSM中。C-SSM纳米药物易于制备,冻干后保持其原始物理化学性质,其IC50比游离姜黄素显著提高(14.2±1.2对26.1±3.0 μM)。此外,C-SSM-VIP在5 μM的剂量下导致肿瘤球形成的抑制率高达20%。为此,我们的研究结果证明了使用我们的主动靶向纳米药物作为富含CSCs的乳腺癌潜在治疗方法的可行性。
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