Department of Pharmacokinetics and Biopharmaceutics, Institute of Biomedical Sciences, Tokushima University.
Curtin Medical School, Faculty of Health Sciences, Curtin University.
Biol Pharm Bull. 2022;45(10):1518-1524. doi: 10.1248/bpb.b22-00389.
PEGylated liposomes (PL) lose their long-circulating characteristic when administered repeatedly, called the accelerated blood clearance (ABC) phenomenon. The ABC phenomenon is generally thought to occur when the anti-polyethylene glycol (PEG) antibody (anti-PEG immunoglobulin M (IgM)) expressed in the spleen B cells triggered by the first dose of PL binds to the second and subsequent doses of PL, leading to activation of the complement system. MAL-PEG-DSPE, a PEG lipid with a maleimide (MAL) group at the PEG terminal, is used in various studies as a linker for ligand-bound liposomes such as antibody-modified liposomes. However, most ABC phenomenon research used PL with a terminal methoxy group (PL-OCH). In this study, we prepared MAL-PEG-DSPE liposomes (PL-MAL) to evaluate the effect of PL-MAL on the ABC phenomenon induction compared to PL-OCH. Pharmacokinetic, anti-PEG IgM secretion and complement activation analyses of these liposomes were conducted in mice. Interestingly, despite C3 bound to the surface of the initially administered PL-MAL, the administered PL-MAL showed high blood retention, demonstrating the same results as PL-OCH. On the other hand, although the secretion of anti-PEG IgM induced by PL-MAL was lower than PL-OCH, the second dose of PL-MAL rapidly disappeared from the blood. These results suggest that the antibody produced from the first dose of PL-MAL binds to the second dose of PL-MAL, thereby activating C3 to act as an opsonin which promotes phagocytic uptake. In conclusion, PL-MAL induced the ABC phenomenon independent of the production of IgM antibodies against PEG. This study provides valuable findings for further studies using ligand-bound liposomes.
聚乙二醇化脂质体(PL)在重复给药时会失去其长循环特性,称为加速血液清除(ABC)现象。通常认为,当首次给予 PL 后脾脏 B 细胞中表达的抗聚乙二醇(PEG)抗体(抗 PEG 免疫球蛋白 M(IgM))与第二剂和随后的 PL 结合时,就会发生 ABC 现象,从而导致补体系统的激活。马来酰亚胺聚乙二醇二硬脂酰基磷脂酰乙醇胺(MAL-PEG-DSPE)是一种在聚乙二醇末端带有马来酰亚胺(MAL)基团的 PEG 脂质,在各种研究中被用作配体结合脂质体(如抗体修饰的脂质体)的连接子。然而,大多数 ABC 现象研究使用末端甲氧基(PL-OCH)的 PL。在这项研究中,我们制备了 MAL-PEG-DSPE 脂质体(PL-MAL),以评估与 PL-OCH 相比,PL-MAL 对 ABC 现象诱导的影响。在小鼠中进行了这些脂质体的药代动力学、抗 PEG IgM 分泌和补体激活分析。有趣的是,尽管最初给予的 PL-MAL 表面结合了 C3,但给予的 PL-MAL 仍保持高血液保留,与 PL-OCH 结果相同。另一方面,尽管 PL-MAL 诱导的抗 PEG IgM 分泌低于 PL-OCH,但第二剂 PL-MAL 迅速从血液中消失。这些结果表明,来自第一剂 PL-MAL 的抗体与第二剂 PL-MAL 结合,从而激活 C3 作为调理素,促进吞噬作用。总之,PL-MAL 诱导 ABC 现象独立于针对 PEG 的 IgM 抗体的产生。这项研究为进一步研究配体结合脂质体提供了有价值的发现。
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