Bergqvist Markus, Park Kyong-Su, Karimi Nasibeh, Yu Lijuan, Lässer Cecilia, Lötvall Jan
Krefting Research Centre, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine at Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
J Nanobiotechnology. 2025 Jan 30;23(1):64. doi: 10.1186/s12951-025-03125-3.
Extracellular vesicles (EVs) are taken up by most cells, however specific or preferential cell targeting remains a hurdle. This study aims to develop an EV that targets cells involved in inflammation, specifically those expressing intercellular adhesion molecule-1 (ICAM-1). To target these cells, we overexpress the ICAM-1 binding receptor "lymphocyte function-associated antigen-1" (LFA-1) in HEK293F cells, by sequential transfection of plasmids of the two LFA-1 subunits, ITGAL and ITGB2 (CD11a and CD18). The LFA-1 receptor was strongly overexpressed on the EVs released by the transfected cells. We further loaded these EVs with a therapeutic peptide, targeting myeloid differentiation primary response 88 (Myd88; EV), through a developed EV open-and-close procedure. Myd88 is a downstream common intracellular messenger for most TLR-receptors. EV expression of LFA-1 increases EV binding to ICAM-1-expressing cells, an effect that was dose-dependently inhibited by a specific neutralizing ICAM-1 antibody. Further, activated human endothelial cells treated with LFA-1 EV had increased uptake of these EVs, resulting in dose-dependent inhibition of induced release of IL-8, presumably by targeting Myd88. We conclude that LFA-1-expressing EV may be a candidate suitable for delivering therapeutic peptides in inflammatory diseases associated with TLR-activation.
大多数细胞都会摄取细胞外囊泡(EVs),然而特异性或优先性细胞靶向仍然是一个障碍。本研究旨在开发一种靶向参与炎症的细胞的细胞外囊泡,特别是那些表达细胞间黏附分子1(ICAM-1)的细胞。为了靶向这些细胞,我们通过依次转染两个LFA-1亚基ITGAL和ITGB2(CD11a和CD18)的质粒,在HEK293F细胞中过表达ICAM-1结合受体“淋巴细胞功能相关抗原1”(LFA-1)。LFA-1受体在转染细胞释放的细胞外囊泡上强烈过表达。我们通过开发的细胞外囊泡开闭程序,进一步将一种靶向髓样分化初级反应88(Myd88;EV)的治疗性肽加载到这些细胞外囊泡中。Myd88是大多数TLR受体的下游常见细胞内信使。LFA-1的细胞外囊泡表达增加了细胞外囊泡与表达ICAM-1的细胞的结合,这种效应被特异性中和ICAM-1抗体剂量依赖性地抑制。此外,用LFA-1细胞外囊泡处理的活化人内皮细胞对这些细胞外囊泡的摄取增加,可能通过靶向Myd88导致诱导的IL-8释放受到剂量依赖性抑制。我们得出结论,表达LFA-1的细胞外囊泡可能是一种适合在与TLR激活相关的炎症性疾病中递送治疗性肽的候选物。