Multispectral Optoacoustic Tomography (MSOT) for Imaging the Particle Size-dependent Intratumoral Distribution of Polymeric Micelles

Overview

Journal Int J Nanomedicine

Publisher Dove Medical Press

Specialty Biotechnology

Date 2018 Dec 28

PMID 30587977

Citations 8

Authors

Zhaoqing Cong

Feifei Yang

Li Cao

Han Wen

Taotao Fu

Siqi Ma

Chunyu Liu

Lihui Quan

Yonghong Liao

Affiliations

Soon will be listed here.

Abstract

Purpose: This study proposes the utilization of multispectral optoacoustic tomography (MSOT) to investigate the intratumoral distribution of polymeric micelles and effect of size on the biodistribution and antitumor efficacy (ATE).

Materials And Methods: Docetaxel and/or optoacoustic agent-loaded polymeric micelles (with diameters of 22, 48, and 124 nm) were prepared using amphiphilic block copolymers poly (ethylene glycol) methyl ether-block-poly (D,L lactide) (PEG-PDLLA). Subcutaneous 4T1 tumor-bearing mice were monitored with MSOT imaging and IVIS Spectrum in vivo live imaging after tail vein injection of micelles. The in vivo results and ex vivo confocal imaging results were then compared. Next, ATE of the three micelles was found and compared.

Results: We found that MSOT imaging offers spatiotemporal and quantitative information on intratumoral distribution of micelles in living animals. All the polymeric micelles rapidly extravasated into tumor site after intravenous injection, but only the 22-nm micelle preferred to distribute into the inner tumor tissues, leading to a superior ATE than that of 48- and 124-nm micelles.

Conclusion: This study demonstrated that MSOT is theranostically a powerful imaging modality, offering quantitative information on size-dependent spatiotemporal distribution patterns after the extravasation of nanomedicine from tumor blood vessels.

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