期刊
ACADEMIC RADIOLOGY
卷 18, 期 12, 页码 1561-1568出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.acra.2011.08.006
关键词
Positron emission tomography; copper(II)-64 chloride; hepatocellular carcinoma; copper metabolism; human copper transporter 1
资金
- Carman & Ann Adams Foundation through the Department of Pediatrics, School of Medicine, Wayne State University (Detroit, MI)
- Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center (Dallas, TX)
- National Cancer Institute (Bethesda, MD) [R24 CA86307]
Rationale and Objectives: The aim of this study was to assess copper metabolism of human hepatocellular carcinoma (HCC) with positron emission tomographic (PET) imaging using copper (II)-64 chloride ((CuCl2)-Cu-64) as a tracer. Materials and Methods: PET imaging of athymic mice (n = 5) bearing extrahepatic HCC xenografts was performed 24 hours after the intravenous injection of (CuCl2)-Cu-64, followed by ex vivo tissue radioactivity assay. Expression of human copper transporter 1 (hCTR1) in HCC cells and tissues was examined by real-time reverse transcription polymerase chain reaction and immunohistochemistry analysis, respectively. Results: The extrahepatic HCC xenografts in mice with increased uptake of Cu-64 radionuclide were visualized on the micro-PET images obtained 24 hours after the intravenous injection of (CuCl2)-Cu-64. PET quantitative analysis revealed increased Cu-64 radioactivity in tumor tissues (2.7 +/- 0.6 %ID/g) compared to that in the soft tissue of the left shoulder opposite to the tumor site (0.6 +/- 0.2 %ID/g) and the brain (0.7 +/- 0.1 %ID/g) but lower than that of the liver (16.6 +/- 1.3 %ID/g). Expression of hCTR1 in the HCC cells and xenograft tumor tissues was demonstrated by real-time reverse transcription polymerase chain reaction and immunohistochemistry analysis, respectively. The expression level of hCTR1 in the Hep3B HCC xenograft tissues was lower than that detected in the normal hepatic tissues and the tissue samples of well-differentiated primary HCC. Variable expression of hCTR1 was detected in the tissue samples of moderately differentiated primary HCC. Conclusions: Extrahepatic human HCC xenografts in mice could be localized with (CuCl2)-Cu-64 PET imaging, which might be useful for the localization and quantitative assessment of copper metabolism in extrahepatic metastases of HCC in humans.
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