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Multispectral optoacoustic tomography (MSOT) for imaging the particle size-dependent intratumoral distribution of polymeric micelles

Authors Cong ZQ, Yang FF, Cao L, Wen H, Fu TT, Ma SQ, Liu CY, Quan LH, Liao YH

Received 30 August 2018

Accepted for publication 27 November 2018

Published 12 December 2018 Volume 2018:13 Pages 8549—8560

DOI https://doi.org/10.2147/IJN.S185726

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Alexander Kharlamov

Peer reviewer comments 2

Editor who approved publication: Dr Linlin Sun


Zhaoqing Cong, Feifei Yang, Li Cao, Han Wen, Taotao Fu, Siqi Ma, Chunyu Liu, Lihui Quan, Yonghong Liao

Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Haidian District, Beijing 100193, People’s Republic of China

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) (PEG2000–PDLLAx). 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.

Keywords:
multispectral optoacoustic tomography, MSOT, polymeric micelle, in vivo imaging, intratumoral distribution, particle size, tumor model

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