School of Life and Health Sciences, Aston University, Birmingham, UK.
Mol Pharm. 2011 Feb 7;8(1):153-61. doi: 10.1021/mp100208f. Epub 2010 Dec 15.
The immunostimulatory capacities of cationic liposomes are well-documented and are attributed both to inherent immunogenicity of the cationic lipid and more physical capacities such as the formation of antigen depots and antigen delivery. Very few studies have however been conducted comparing the immunostimulatory capacities of different cationic lipids. In the present study we therefore chose to investigate three of the most well-known cationic liposome-forming lipids as potential adjuvants for protein subunit vaccines. The ability of 3β-[N-(N',N'-dimethylaminoethane)carbomyl] cholesterol (DC-Chol), 1,2-dioleoyl-3-trimethylammonium propane (DOTAP), and dimethyldioctadecylammonium (DDA) liposomes incorporating immunomodulating trehalose dibehenate (TDB) to form an antigen depot at the site of injection (SOI) and to induce immunological recall responses against coadministered tuberculosis vaccine antigen Ag85B-ESAT-6 are reported. Furthermore, physical characterization of the liposomes is presented. Our results suggest that liposome composition plays an important role in vaccine retention at the SOI and the ability to enable the immune system to induce a vaccine specific recall response. While all three cationic liposomes facilitated increased antigen presentation by antigen presenting cells, the monocyte infiltration to the SOI and the production of IFN-γ upon antigen recall was markedly higher for DDA and DC-Chol based liposomes which exhibited a longer retention profile at the SOI. A long-term retention and slow release of liposome and vaccine antigen from the injection site hence appears to favor a stronger Th1 immune response.
阳离子脂质体的免疫刺激能力已有充分的文献记载,这既归因于阳离子脂质的固有免疫原性,也归因于其更物理的能力,如抗原库的形成和抗原递呈。然而,很少有研究比较不同阳离子脂质的免疫刺激能力。在本研究中,我们因此选择了三种最著名的阳离子脂质体形成脂质作为蛋白质亚单位疫苗的潜在佐剂进行研究。3β-[N-(N',N'-二甲氨基乙酰胺)碳酰基]胆固醇(DC-Chol)、1,2-二油酰基-3-三甲铵丙烷(DOTAP)和二甲基十八烷基铵(DDA)脂质体结合免疫调节海藻糖二硬脂酸酯(TDB)在注射部位(SOI)形成抗原库并诱导针对共给药结核疫苗抗原 Ag85B-ESAT-6 的免疫回忆反应的能力报告。此外,还介绍了脂质体的物理特性。我们的结果表明,脂质体组成在疫苗在 SOI 的保留和使免疫系统能够诱导疫苗特异性回忆反应的能力方面起着重要作用。虽然所有三种阳离子脂质体都促进了抗原呈递细胞对抗原的呈递,但单核细胞向 SOI 的浸润和抗原回忆时 IFN-γ 的产生在基于 DDA 和 DC-Chol 的脂质体中明显更高,它们在 SOI 中的保留时间更长。从注射部位缓慢释放脂质体和疫苗抗原的长期保留似乎有利于更强的 Th1 免疫反应。
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