Laboratory of Immunology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium.
J Control Release. 2012 Jun 28;160(3):431-9. doi: 10.1016/j.jconrel.2012.02.006. Epub 2012 Feb 13.
Vaccination is the most efficient way to combat and prevent infectious diseases. However, most vaccines are administered systemically and are ineffective in eliciting protective immunity at mucosal sites. By contrast, oral delivery of therapeutic or prophylactic vaccines induces both systemic and mucosal immune responses. Additionally, oral delivery offers several advantages over systemic vaccination, such as ease of administration and increased safety. Despite these advantages, progress in oral vaccination has been rather slow due to the many hurdles posed by the gastrointestinal tract. To be effective as oral vaccine, antigens need to be resistant against or protected from acidic and enzymatic denaturation before reaching their target site, where their uptake should be enhanced, resulting in an increased immunogenicity. Despite the development of numerous delivery systems, their uptake by the intestinal epithelium remains poor. Most efforts are focussed on strategies to augment M cell mediated uptake. In the current review we discuss the possible strategies to target transcytotic receptors expressed on the apical surface of not only M cells, but also enterocytes to facilitate the uptake of antigen-loaded biodegradable microparticles, which could result in the induction of robust protective immune responses in multiple species.
疫苗接种是对抗和预防传染病最有效的方法。然而,大多数疫苗是全身性给药的,在黏膜部位无法引发有效的保护免疫。相比之下,口服给予治疗性或预防性疫苗会引起系统和黏膜免疫反应。此外,口服给药相对于全身接种具有许多优势,如给药方便和安全性提高。尽管有这些优势,但由于胃肠道带来的诸多障碍,口服疫苗的进展相当缓慢。为了成为有效的口服疫苗,抗原需要在到达靶部位之前抵抗或免受酸性和酶变性,在该部位应该增强其摄取,从而提高免疫原性。尽管已经开发了许多输送系统,但它们被肠上皮细胞摄取的情况仍然很差。大多数努力都集中在增强 M 细胞介导摄取的策略上。在当前的综述中,我们讨论了靶向表达在 M 细胞上的穿越受体的可能策略,以及表达在肠细胞上的穿越受体,以促进负载抗原的可生物降解微球的摄取,这可能导致在多种物种中诱导出强大的保护性免疫反应。
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