Department of Hepatitis and AIDS, Pasteur Institute of Iran, Tehran, Iran.
Department of Hepatitis and AIDS, Pasteur Institute of Iran, Tehran, Iran.
Int Immunopharmacol. 2018 Sep;62:170-180. doi: 10.1016/j.intimp.2018.07.006. Epub 2018 Jul 20.
The high risk human papillomavirus (HPV) types 16 and 18 are globally linked to >50% and 20% of all cervical cancers, respectively. The HPV E7 oncoprotein was determined as a therapeutic vaccine target due to its constitutive expression by HPV-infected cells. The findings demonstrated the efficiency of therapeutic HPV DNA- and protein-based vaccines in preclinical and clinical trials. However, there are limitations for penetration of DNA and protein constructs into the cells without a suitable delivery system. Recently, several cell penetrating peptides (CPPs) have been suggested for delivery of nucleic acids and proteins into cells through covalent or non-covalent fashion. In this study, we determined highly efficient CPPs for the controlled delivery of HPV16 E7 antigen, in vitro and in vivo. Our data indicated the effective delivery of E7 protein by Pep-1, Cady-2, P28 and hPP10, and E7 DNA by MPG and +36 GFP CPPs in HEK-293T cell line at certain ratios. Moreover, immunization with the heterologous MPG + E7 DNA prime/P28 + rE7 protein boost elicited a higher Th1 cellular immune response with a predominant IFN-γ profile and strong Granzyme B secretion than those induced by other groups in a murine tumor model. Indeed, the groups vaccinated with rE7+ P28/rE7+ P28, MPG+ E7 DNA/P28+ rE7, and E7 DNA+ MPG/E7 DNA+ MPG nanovaccines displayed complete protection and remained tumor-free >60 days after treatment. These data suggest P28 and MPG as promising protein and gene delivery systems for development of HPV therapeutic vaccines.
高危型人乳头瘤病毒(HPV)16 型和 18 型分别在全球范围内导致超过 50%和 20%的宫颈癌。HPV E7 癌蛋白由于被 HPV 感染的细胞持续表达,被确定为治疗性疫苗的靶标。研究结果表明,治疗性 HPV DNA 和蛋白质疫苗在临床前和临床试验中是有效的。然而,在没有合适的递送系统的情况下,DNA 和蛋白质构建体进入细胞的效率有限。最近,已经提出了几种细胞穿透肽(CPPs),用于通过共价或非共价方式将核酸和蛋白质递送到细胞中。在这项研究中,我们确定了用于控制递送至 HPV16 E7 抗原的高效 CPP,在体外和体内。我们的数据表明,Pep-1、Cady-2、P28 和 hPP10 可有效地递呈 E7 蛋白,MPG 和+36 GFP CPP 可有效地递呈 E7 DNA,在一定比例下,在 HEK-293T 细胞系中。此外,用异源 MPG+E7 DNA 初级/P28+rE7 蛋白加强免疫在小鼠肿瘤模型中诱导了更高的 Th1 细胞免疫反应,表现为 IFN-γ 谱为主和强烈的 Granzyme B 分泌,优于其他组。事实上,用 rE7+P28/rE7+P28、MPG+E7 DNA/P28+rE7 和 E7 DNA+MPG/E7 DNA+MPG 纳米疫苗接种的组显示出完全的保护作用,在治疗后超过 60 天仍保持无肿瘤状态。这些数据表明 P28 和 MPG 是有前途的蛋白质和基因递送系统,可用于开发 HPV 治疗性疫苗。