RESUMO
Optical fluorescence imaging is an important strategy to explore the mechanism of virus-host interaction. However, current fluorescent tag labeling strategies often dampen viral infectivity. The present study explores an in situ fluorescent labeling strategy in order to preserve viral infectivity and precisely monitor viral infection in vivo. In contrast to pre-labeling strategy, mice are first intranasally infected with azide-modified H5N1 pseudotype virus (N3 -H5N1p), followed by injection of dibenzocyclooctyl (DBCO)-functionalized fluorescence 6 h later. The results show that DBCO dye directly conjugated to N3 -H5N1p in lung tissues through in vivo bioorthogonal chemistry with high specificity and efficacy. More remarkably, in situ labeling rather than conventional prelabeling strategy effectively preserves viral infectivity and immunogenicity both in vitro and in vivo. Hence, in situ bioorthogonal viral labeling is a promising and reliable strategy for imaging and tracking viral infection in vivo.
Assuntos
Virus da Influenza A Subtipo H5N1/patogenicidade , Imagem Óptica/métodos , Química ClickRESUMO
Multimodal imaging is highly desirable for accurate diagnosis because it can provide complementary information from each imaging modality. In this study, we prepared hybrid gold-gadolinium nanoclusters (NCs), which are ultrasmall, stable, biocompatible, and suitable for triple-modal NIRF/CT/MRI imaging. Upon intravenously injected, the hybrid NCs are effectively accumulated in tumor tissues and quickly clear by renal excretion, indicating their capacity of tumor targeting and low body residues. Notably, the ultrasmall hybrid NCs would penetrate into the solid tumor for capturing its heterostructure and do not induce potential toxicity in vivo. Hence, the well-defined hybrid gold-gadolinium NCs provide a versatile nanoprobe for cancer targeted imaging and diagnosis in vivo.
Assuntos
Gadolínio/química , Ouro , Imageamento por Ressonância Magnética/métodos , Microscopia de Fluorescência/métodos , Nanoestruturas , Neoplasias Experimentais/diagnóstico , Tomografia Computadorizada por Raios X/métodos , Linhagem Celular Tumoral , Meios de Contraste/síntese química , Humanos , Teste de Materiais , Tamanho da Partícula , Técnica de SubtraçãoRESUMO
Nanotechnology has been extensively merging into biomedical research to develop a new research field-Nanobiomedicine. It provides a unique approach and comprehensive technology against cancer by early diagnosis, prediction, prevention, personalized therapy and medicine. This review focused on the progress of nanotechnology in early diagnosis and treatment of cancer.
