Antigen folding improves loading efficiency and antitumor efficacy of PC7A nanoparticle vaccine.

Antigen folding improves loading efficiency and antitumor efficacy of PC7A nanoparticle vaccine.
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DOI:
10.1016/j.jconrel.2020.11.056
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发表时间:
2021-01-10
期刊:
Journal of controlled release : official journal of the Controlled Release Society
影响因子:
--
通讯作者:
Gao J
Gao J
中科院分区:
其他
文献类型:
--
作者:
Wilhelm J;Quiñones-Pérez M;Wang J;Wang X;Basava VS;Gao J

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癌症疫苗在产生抗原特异性T细胞免疫以用于癌症的个性化治疗方面具有很大的希望。以前,我们报道了一种超pH敏感的纳米颗粒,PC 7A,能够引发有效的免疫反应,而没有显着的全身毒性。尽管早期的成功,抗原特性和下游免疫激活的包封效率之间的关系仍然知之甚少。在这项研究中,我们研究了一个小的黑色素瘤抗原库和几种配制方法对PC 7A纳米颗粒内肽负载效率的影响。结果表明,装载效率并不高度依赖于配制方法,而是主要由肽抗原性质驱动。特别是,我们确定了一个相变事件,即抗原肽从无规卷曲折叠成α-螺旋结构,这对PC 7A纳米颗粒内的抗原负载很重要。消除螺旋结构形成的肽的突变导致差的装载效率。在荷黑色素瘤小鼠中的抗肿瘤功效研究证明了肽负载在疫苗诱导的抗肿瘤免疫中的重要性。这项研究强调了肽抗原的相变对疫苗制剂的贡献,以使个性化纳米颗粒疫苗的广泛使用成为可能。
Cancer vaccines hold great promise to produce antigen-specific T cell immunity for personalized therapy of cancer. Previously, we reported an ultra-pH-sensitive nanoparticle, PC7A, capable of priming an efficacious immune response without significant systemic toxicity. Despite the early success, the relationship between antigen properties and encapsulation efficiency for downstream immune activation remains poorly understood. In this study, we investigated a small library of melanoma antigens and the effects of several formulation methods on the efficiency of peptide loading inside PC7A nanoparticles. Results show loading efficiency is not highly dependent on the formulation methods, but instead mainly driven by the peptide antigen properties. In particular, we identified a phase transition event, namely the folding of antigenic peptides from random coils to α-helical structure, is important for antigen loading inside PC7A nanoparticles. Mutation of a peptide that abrogates the formation of helical structure resulted in poor loading efficiency. Antitumor efficacy studies in melanoma-bearing mice demonstrate the importance of peptide loading in vaccine-induced antitumor immunity. This study highlights the contribution of phase transition of peptide antigens on vaccine formulation in order to make widespread use of personalized nanoparticle vaccines feasible.
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