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J Nucl Med. 2017 May;58(5):821-826. doi: 10.2967/jnumed.116.183863. Epub 2017 Jan 19.

SPECT/CT Imaging of the Novel HER2-Targeted Peptide Probe 99mTc-HYNIC-H6F in Breast Cancer Mouse Models.

Li L1, Wu Y1, Wang Z2, Jia B1,3, Hu Z2, Dong C4, Wang F5,4.

Author information

1
Medical Isotopes Research Center and Department of Radiation Medicine, School of Basic Medical Sciences, Peking University, Beijing, China.
2
CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China, Beijing, China.
3
Medical and Healthy Analytical Center, Peking University, Beijing, China; and.
4
Key Laboratory of Protein and Peptide Pharmaceuticals, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
5
Medical Isotopes Research Center and Department of Radiation Medicine, School of Basic Medical Sciences, Peking University, Beijing, China wangfan@bjmu.edu.cn.

Abstract

Overexpression of human epidermal growth factor receptor 2 (HER2) plays important roles in tumorigenesis and tumor progression in breast cancer. Nuclear imaging of HER2 expression in tumors might detect all HER2-positive tumors throughout the body and guide HER2-targeted therapies for patients. We therefore aimed to develop a HER2-targeted peptide probe for breast cancer imaging. A novel SPECT imaging probe, 99mTc-HYNIC-H6F, was prepared and then evaluated in breast cancer animal models. Methods: The HER2-targeted peptide H6F (YLFFVFER) was conjugated with the bifunctional chelator hydrazinonicotinamide (HYNIC). 99mTc-HYNIC-H6F was prepared, and the in vivo characteristics of 99mTc-HYNIC-H6F were investigated in MDA-MB-453 (HER2-positive) and MDA-MB-231 (HER2-negative) models using small-animal SPECT/CT. Moreover, to investigate the specificity of the H6F peptide toward HER2 and the potential applications in monitoring therapies involving trastuzumab, unlabeled H6F and trastuzumab were used as blocking agents in cell competition studies and SPECT imaging. Results: A standard tricine/trisodium triphenylphosphine-3,3',3″-trisulfonate labeling procedure demonstrated that the radiochemical purity was greater than 95%. 99mTc-HYNIC-H6F displayed excellent HER2-binding specificity both in vitro and in vivo. SPECT/CT imaging revealed that the MDA-MB-453 tumors were clearly visualized (percentage injected dose per gram, 3.58 ± 0.01 at 30 min after injection), whereas the signals in HER2-negative MDA-MB-231 tumors were much lower (0.73 ± 0.22 at 30 min after injection). Tumor uptake of MDA-MB-453 was blocked by the coinjection of excess H6F but not by excess trastuzumab. Conclusion: The 99mTc-HYNIC-H6F peptide probe specifically accumulates in HER2-positive tumors and is therefore promising for the diagnosis of HER2-positive cancers. Because 99mTc-HYNIC-H6F and trastuzumab target different regions of the HER2 receptor, this radiotracer also has great potential for monitoring the therapeutic efficacy of trastuzumab by rechecking the expression level of HER2 without blocking effect during therapy.

KEYWORDS:

HER2; SPECT; breast cancer; targeting peptide; trastuzumab

PMID:
28104744
DOI:
10.2967/jnumed.116.183863
[Indexed for MEDLINE]
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