Preparation of polydopamine modified phase-shift contrast agents for enhanced photoacoustic/ultrasound imaging <italic style="font-style: italic">in vitro</italic> and <italic style="font-style: italic">in vivo</italic>

Ying WANG; Dong WANG; Liang ZHANG; Xueying CHEN; Nyujun ZHAO; Zhigang WANG; Chongyan LI; Ke YANG

doi:10.16016/j.1000-5404.201807017

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Preparation of polydopamine modified phase-shift contrast agents for enhanced photoacoustic/ultrasound imaging in vitro and in vivo

Basic Medicine | 更新时间：2026-01-09

- Preparation of polydopamine modified phase-shift contrast agents for enhanced photoacoustic/ultrasound imaging in vitro and in vivo
- Journal of Third Military Medical University Vol. 40, Issue 23, Pages: 2190-2196(2018)
- 作者机构：
  
  1.400014 重庆, 重庆医科大学附属儿童医院儿科研究所, 儿童发育疾病研究教育部重点实验室, 儿童发育重大疾病国家国际科技合作基地重庆市干细胞治疗工程技术研究中心
  2.400010 重庆, 重庆医科大学超声影像学研究所超声分子影像重庆市重点实验室
  3.400016 重庆, 重庆医科大学附属第一医院超声科
  4.400014 重庆, 重庆医科大学超声医学工程研究所省部共建国家重点实验室培育基地
- 作者简介：
- 基金信息：
  
  the General Program of National Natural Science Foundation of China(81571688);the General Program of National Natural Science Foundation of China(81771845);the General Program of National Natural Science Foundation of China(81371718)
- DOI：10.16016/j.1000-5404.201807017
  CLC： R445.1;R914.5;R981.9
- Received：27 July 2018，
  
  Revised：2018-08-27，
  
  Published：15 December 2018
- 稿件说明：
移动端阅览
Ying WANG, Dong WANG, Liang ZHANG, et al. Preparation of polydopamine modified phase-shift contrast agents for enhanced photoacoustic/ultrasound imaging in vitro and in vivo[J]. Journal of Third Military Medical University, 2018, 40(23): 2190-2196.
DOI：

Ying WANG, Dong WANG, Liang ZHANG, et al. Preparation of polydopamine modified phase-shift contrast agents for enhanced photoacoustic/ultrasound imaging in vitro and in vivo[J]. Journal of Third Military Medical University, 2018, 40(23): 2190-2196. DOI： 10.16016/j.1000-5404.201807017.

摘要

目的

制备一种新型的聚多巴胺修饰的光声/超声双模态对比剂(PFP@PLGA@PDAs)

探究其体内外光声、超声显影效果。

方法

① 采用单乳化法-溶液氧化法合成聚多巴胺表面修饰的全氟正戊烷高分子纳米粒(PFP@PLGA@PDAs)

检测PFP@PLGA@PDAs的基本性质; ②以未修饰的相变型纳米粒(PFP@PLGAs)作为对照

应用琼脂糖模型测量纳米粒的体外光声和超声信号; ③选取雌性BALB/c裸鼠(4~6周龄

体质量20 g)

构建裸鼠4T1乳腺癌动物模型

分为3组(PFP@PLGA@PDAs实验组

PFP@PLGAs对照组和PBS对照组

=6)

尾静脉注射对比剂后探究体内增强实体肿瘤的光声成像和超声成像的效果。

结果

① PFP@PLGA@PDAs悬液呈深褐色

纳米粒为球形的壳-核结构

粒径(209.40±36.15)nm

显微镜下见温度达43 ℃以上时发生液-气相变

CCK-8实验结果提示良好生物安全性。②体外光声成像显示

PFP@PL

GA@PDAs的光声信号随浓度增加而明显增强(

0.05)

PFP@LGAs始终不显影; 体外超声成像显示

经激光辐照后

PFP@PLGA@PDAs在基波和谐波模式下的回声信号均明显增强

不同辐照时长的谐波声强值间差异具有统计学意义(

0.05)

PFP@PLGAs的回声信号无明显变化。③体内光声成像显示

尾静脉注射PFP@PLGA@PDAs的荷瘤鼠的肿瘤部位在注射前和注射后1、4、24 h的光声信号值分别为(0.12±0.03)、(0.22±0.04)、(0.67±0.08)、(0.37±0.06)

差异有统计学意义(

0.05)

PFP@PLGAs和PBS组荷瘤鼠的肿瘤部位始终未见明显光声信号。体内超声成像显示

在激光辐照前

3组荷瘤鼠的肿瘤部位表现相似的超声回声信号

激光辐照后PFP@PLGA@PDAs组肿瘤的二维和造影图像均显示明显增多的点状高信号

而PFP@PLGAs和PBS组在辐照前后均未见明显回声信号改变。

结论

成功制备出一种聚多巴胺修饰的相变型对比剂

其具有作为一种分子探针实现肿瘤的体内外光声/超声双模态成像的潜力。

Abstract

Objective

To prepare a new polydopamine modified phase-shift dual-mode contrast agent (PFP@PLGA@PDAs) and investigate its enhanced photoacoustic and ultrasound imaging

in vitro

and

in vivo

Methods

① After PFP@PLGA@PDAs were prepared by sonication process and solution oxidation

the physicochemical properties were later characterized. ② With unmodified PFP@PLGAs as control

agar-based phantoms were used to assess photoacoustic and ultrasound signals of these nanoparticles

in vitro

. ③ Eighteen female nude mice(4~6 weeks old

weighting about 20 g) were employed to establish a murine 4T1 breast xenograft model

and were then randomly divided into PFP@PLGA@PDAs group

PFP@PLGAs group and PBS group

with 6 mice in each group. The effects of above agents (tail vein injection) were observed for photoacoustic imaging and ultrasound imaging

in vivo

Results

① The prepared PFP@PLGA@PDAs solution were dark brown in color

and showed a well-defined core-shell structured spherical morphology. The mean diameter of PFP@PLGA@PDAs was 209.40±36.15 nm. Vaporization was triggered at 43 ℃. CCK-8 assay suggested good biological safety. ②

In vitro

photoacoustic imaging experiments showed that the photoac

oustic signals of PFP@PLGA@PDAs solution were raised significantly with the increase of concentration

while PFP@PLGAs displayed nearly no such signals. For enhanced ultrasound imaging experiments

in vivo

PFP@PLGA@PDAs solution significantly increased the intensity of echo in B-mode and contrast-enhanced ultrasonography after laser irradiation (

0.05)

with obvious differences in the intensity of harmonic signals under different durations of irradiation (

0.05). No such changes were seen when PFP@PLGAs solution was employed. ③

In vivo

photoacoustic study showed that

before and in 1

4 and 24 h after the injection of PFP@PLGA@PDAs solution

the intensity of photoacoustic signals was 0.12±0.03

0.22±0.04

0.67±0.08 and 0.37±0.06

respectively (

0.05). No photoacoustic signal was observed in the tumors of the mice injected with PBS and PFP@PLGA solution. In

in vitro

ultrasonic study

similar echo signals were observed in the tumors of the 3 groups of mice before laser irradiation

but significantly enhanced high-intensity signals were only found in 2-D and contrast images in the mice from the PFP@PLGA@PDAs group after laser irradiation

while

no such changes of echo intensity were found in the 2 control groups.

Conclusion

Phase-shift contrast agent modified by dopamine is successfully prepared

and it

as a molecular probe

presents the potential of photoacoustic/ultrasound dual-mode imaging.

关键词

Keywords

references

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Preparation of polydopamine modified phase-shift contrast agents for enhanced photoacoustic/ultrasound imaging in vitro and in vivo

DOI：10.16016/j.1000-5404.201807017

摘要

Abstract

关键词

Keywords

references