Novel multifunctional theranostic liposome drug delivery system: construction, characterization, and multimodality MR, near-infrared fluorescent, and nuclear imaging.

Bioconjugate Chemistry
Shihong LiAnde Bao

Abstract

Liposomes are effective lipid nanoparticle drug delivery systems, which can also be functionalized with noninvasive multimodality imaging agents with each modality providing distinct information and having synergistic advantages in diagnosis, monitoring of disease treatment, and evaluation of liposomal drug pharmacokinetics. We designed and constructed a multifunctional theranostic liposomal drug delivery system, which integrated multimodality magnetic resonance (MR), near-infrared (NIR) fluorescent and nuclear imaging of liposomal drug delivery, and therapy monitoring and prediction. The premanufactured liposomes were composed of DSPC/cholesterol/Gd-DOTA-DSPE/DOTA-DSPE with the molar ratio of 39:35:25:1 and having ammonium sulfate/pH gradient. A lipidized NIR fluorescent tracer, IRDye-DSPE, was effectively postinserted into the premanufactured liposomes. Doxorubicin could be effectively postloaded into the multifunctional liposomes. The multifunctional doxorubicin-liposomes could also be stably radiolabeled with (99m)Tc or (64)Cu for single-photon emission computed tomography (SPECT) or positron emission tomography (PET) imaging, respectively. MR images displayed the high-resolution micro-intratumoral distribution of the lipos...Continue Reading

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