Shudan Zheng,Zhenghao Zhou,Jie Ji,Yuxin Liu,Xiaodan Jiao,Xiaoyang Li,Yi Shen,Hao Hong,Xiaodong Han
Idiopathic pulmonary fibrosis (IPF) exhibits extremely high mortality rates. Targeted therapy, which utilizes specific drugs or other substances to identify and attack specific molecular targets in the lesion, holds promise as a potent means of treating IPF. M2 macrophages have been shown to express high levels of osteopontin (OPN) early in the onset of IPF and sustain this high expression to promote the progression of IPF. Intervention in OPN expression can effectively impede the development of fibrosis. While the technology for targeting proteins with siRNA has become increasingly mature, the targeted delivery of siRNA to resident M2 macrophages in the lungs remains challenging. In this study, we developed an engineered self-assembling OPN siRNA carrier complex based on a metal-polyphenol network (luteolin-Zr) and PEG conjugated with an M2 macrophage-targeting peptide (Pery-PEG-M2), termed siOPN@LuZ-M2, for the treatment of pulmonary fibrosis. Consequently, significant therapeutic effects were observed in both bleomycin-induced pulmonary fibrosis mouse models and human precision-cut lung slices (hPCLS) models. Importantly, luteolin, which is slowly released from siOPN@LuZ-M2 within cells, can gradually accumulate in fibrotic lung tissue, exerting an anti-inflammatory effect and further enhancing the treatment of IPF. It is worth mentioning that siOPN@LuZ-M2 can be labeled with 89 Zr, allowing for the detection of its in vivo distribution and metabolic behavior via PET-CT. This study presents a promising new image-guided molecular targeting strategy for the treatment of fibrosis.
Multifunctional nanocarriers, which can be used for molecular imaging and drug delivery simultaneously, favor the fabrication of theranostic platforms in a less cost- and time-consuming way. Polyethylene glycol (PEG)-modified manganese dioxide (MnO 2 ) nanosheets (PEG-MnO 2 ), used as two-dimensional nanomaterials, not only possess the high surface-to-volume ratio necessary for drug delivery but also display a redoxable property in the tumor microenvironment, producing Mn 2+ ions for magnetic resonance imaging (MRI). In this study, we constructed a PEG-MnO 2 -OPN siRNA nanocomplex via a modular streptavidin bridge for the theranostic treatment of renal carcinoma in vitro and in vivo . This strategy of utilizing PEG-MnO 2 nanosheets for OPN siRNA delivery showed effective tumor growth inhibition of 786-O tumor-bearing mice, and such a process could be monitored by the activated T 1 -weight MRI, illustrating the promising potential of PEG-MnO 2 nanosheets for the fabrication of an MRI-based theranostic system.
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