Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104;
Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104.
Proc Natl Acad Sci U S A. 2020 Feb 18;117(7):3405-3414. doi: 10.1073/pnas.1912012117. Epub 2020 Jan 31.
Drug targeting to inflammatory brain pathologies such as stroke and traumatic brain injury remains an elusive goal. Using a mouse model of acute brain inflammation induced by local tumor necrosis factor alpha (TNFα), we found that uptake of intravenously injected antibody to vascular cell adhesion molecule 1 (anti-VCAM) in the inflamed brain is >10-fold greater than antibodies to transferrin receptor-1 and intercellular adhesion molecule 1 (TfR-1 and ICAM-1). Furthermore, uptake of anti-VCAM/liposomes exceeded that of anti-TfR and anti-ICAM counterparts by ∼27- and ∼8-fold, respectively, achieving brain/blood ratio >300-fold higher than that of immunoglobulin G/liposomes. Single-photon emission computed tomography imaging affirmed specific anti-VCAM/liposome targeting to inflamed brain in mice. Intravital microscopy via cranial window and flow cytometry showed that in the inflamed brain anti-VCAM/liposomes bind to endothelium, not to leukocytes. Anti-VCAM/LNP selectively accumulated in the inflamed brain, providing de novo expression of proteins encoded by cargo messenger RNA (mRNA). Anti-VCAM/LNP-mRNA mediated expression of thrombomodulin (a natural endothelial inhibitor of thrombosis, inflammation, and vascular leakage) and alleviated TNFα-induced brain edema. Thus VCAM-directed nanocarriers provide a platform for cerebrovascular targeting to inflamed brain, with the goal of normalizing the integrity of the blood-brain barrier, thus benefiting numerous brain pathologies.
针对炎症性脑病理,如中风和创伤性脑损伤的药物靶向仍然是一个难以实现的目标。使用局部肿瘤坏死因子 α(TNFα)诱导的急性脑炎症小鼠模型,我们发现,在炎症大脑中,静脉注射的血管细胞粘附分子 1(抗-VCAM)抗体的摄取量是转铁蛋白受体 1(TfR-1)和细胞间粘附分子 1(ICAM-1)抗体的摄取量的 10 倍以上。此外,抗-VCAM/脂质体的摄取量分别比抗-TfR 和抗-ICAM 对应物高 27 倍和 8 倍,达到脑/血比高于 IgG/脂质体 300 倍以上。单光子发射计算机断层扫描成像证实了抗-VCAM/脂质体在小鼠炎症大脑中的特异性靶向。通过颅窗和流式细胞术的活体显微镜检查显示,在炎症大脑中,抗-VCAM/脂质体与内皮结合,而不是与白细胞结合。抗-VCAM/LNP 选择性地在炎症大脑中积累,为货物信使 RNA(mRNA)编码的蛋白质提供新的表达。抗-VCAM/LNP-mRNA 表达血栓调节蛋白(一种天然的内皮抑制物,可抑制血栓形成、炎症和血管渗漏),减轻 TNFα 诱导的脑水肿。因此,VCAM 导向的纳米载体为炎症性脑的血管靶向提供了一个平台,其目标是使血脑屏障的完整性正常化,从而有益于多种脑病理。