脂质体:用于感染性黏膜疫苗接种的多功能递药系统。

Lipid-Based Particles: Versatile Delivery Systems for Mucosal Vaccination against Infection.

机构信息

R&D Laboratory, Division of Immunology and Allergy, Centre des Laboratoires d'Epalinges, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland.

出版信息

Front Immunol. 2018 Mar 7;9:431. doi: 10.3389/fimmu.2018.00431. eCollection 2018.

Abstract

Vaccination is the process of administering immunogenic formulations in order to induce or harness antigen (Ag)-specific antibody and T cell responses in order to protect against infections. Important successes have been obtained in protecting individuals against many deleterious pathological situations after parenteral vaccination. However, one of the major limitations of the current vaccination strategies is the administration route that may not be optimal for the induction of immunity at the site of pathogen entry, i.e., mucosal surfaces. It is now well documented that immune responses along the genital, respiratory, or gastrointestinal tracts have to be elicited locally to ensure efficient trafficking of effector and memory B and T cells to mucosal tissues. Moreover, needle-free mucosal delivery of vaccines is advantageous in terms of safety, compliance, and ease of administration. However, the quest for mucosal vaccines is challenging due to (1) the fact that Ag sampling has to be performed across the epithelium through a relatively limited number of portals of entry; (2) the deleterious acidic and proteolytic environment of the mucosae that affect the stability, integrity, and retention time of the applied Ags; and (3) the tolerogenic environment of mucosae, which requires the addition of adjuvants to elicit efficient effector immune responses. Until now, only few mucosally applicable vaccine formulations have been developed and successfully tested. In animal models and clinical trials, the use of lipidic structures such as liposomes, virosomes, immune stimulating complexes, gas-filled microbubbles and emulsions has proven efficient for the mucosal delivery of associated Ags and the induction of local and systemic immune reponses. Such particles are suitable for mucosal delivery because they protect the associated payload from degradation and deliver concentrated amounts of Ags specialized sampling cells (microfold cells) within the mucosal epithelium to underlying antigen-presenting cells. The review aims at summarizing recent development in the field of mucosal vaccination using lipid-based particles. The modularity ensured by tailoring the lipidic design and content of particles, and their known safety as already established in humans, make the continuing appraisal of these vaccine candidates a promising development in the field of targeted mucosal vaccination.

摘要

疫苗接种是指通过给予免疫原性制剂来诱导或利用抗原(Ag)特异性抗体和 T 细胞应答,以预防感染。在通过肠道外接种保护个体免受许多有害病理情况方面已经取得了重要成功。然而,当前疫苗接种策略的主要局限性之一是接种途径,该途径可能不是诱导病原体进入部位(即黏膜表面)免疫的最佳途径。现在已有充分的文献证明,必须在生殖、呼吸或胃肠道部位局部诱导免疫应答,以确保效应器和记忆 B 和 T 细胞有效地迁移到黏膜组织。此外,无针黏膜疫苗接种在安全性、顺应性和给药便利性方面具有优势。然而,由于以下几个原因,黏膜疫苗的研究具有挑战性:(1) 抗原采样必须通过相对有限数量的进入门户穿过上皮进行;(2) 黏膜的酸性和蛋白水解环境会影响应用抗原的稳定性、完整性和保留时间;(3) 黏膜的耐受环境,需要添加佐剂来引发有效的效应免疫应答。到目前为止,只有少数黏膜适用的疫苗制剂已被开发并成功测试。在动物模型和临床试验中,已经证明脂质结构(如脂质体、病毒体、免疫刺激复合物、充气体微泡和乳剂)的使用对于相关抗原的黏膜传递和局部和全身免疫应答的诱导是有效的。这些颗粒适合黏膜传递,因为它们可以保护相关有效载荷免受降解,并将大量抗原递送到黏膜上皮内的专门采样细胞(微皱褶细胞)到下面的抗原呈递细胞。本综述旨在总结使用基于脂质的颗粒进行黏膜免疫接种的最新进展。通过调整脂质设计和颗粒的含量来确保模块化,以及它们在人类中已经确立的已知安全性,使得对这些疫苗候选物的持续评估成为靶向黏膜免疫接种领域的一个有前途的发展方向。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/33ac/5845866/95ac72f61a23/fimmu-09-00431-g001.jpg

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