A limited overlap between intratumoral distribution of 1-(5-fluoro-5-deoxy-α-D-arabinofuranosyl)-2-nitroimidazole and copper-diacetyl-bis[N(4)-methylthiosemicarbazone]

Furukawa,Takako; Yuan,Qinghua; Jin,Zhao-Hui; Aung,Winn; Yoshii,Yukie; Hasegawa,Sumitaka; Endo,Hiroko; Inoue,Masahiro; Zhang,Ming‑Rong; Fujibayashi,Yasuhisa; Saga,Tsuneo

doi:10.3892/or.2015.4079

A limited overlap between intratumoral distribution of 1-(5-fluoro-5-deoxy-α-D-arabinofuranosyl)-2-nitroimidazole and copper-diacetyl-bis[N(4)-methylthiosemicarbazone]

Authors:
- Takako Furukawa
- Qinghua Yuan
- Zhao-Hui Jin
- Winn Aung
- Yukie Yoshii
- Sumitaka Hasegawa
- Hiroko Endo
- Masahiro Inoue
- Ming‑Rong Zhang
- Yasuhisa Fujibayashi
- Tsuneo Saga
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Affiliations: Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, Department of Biochemistry, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
Published online on: June 25, 2015 https://doi.org/10.3892/or.2015.4079
Pages: 1379-1387

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Abstract

Positron emission tomography (PET) imaging of tumor hypoxia provides valuable information for cancer treatment planning. Two types of PET tracers, nitroimidazole compounds and [62,64Cu] copper-diacetyl-bis[N(4)-methylthio- semicarbazone] (Cu-ATSM), have been used for imaging hypoxic tumors. High accumulation of these tracers in tumors was shown to predict poor prognosis. Both similar and different intratumoral distributions of these PET tracers have been reported with some studies questioning the dependence of the Cu-ATSM accumulation on hypoxia. In the present study, we compared the intratumoral distribution and cellular uptake of 1-(5-fluoro-5-deoxy-α-D-arabinofuranosyl)-2-nitroimidazole (FAZA) and Cu-ATSM. Intratumoral distributions of FAZA and Cu-ATSM compared by double tracer autoradiography in xenografts of 8 cancer cell lines and 3 cancer tissue originated spheroids (CTOSs) showed that only a limited overlap was observed between the regions with high levels of FAZA and Cu-ATSM accumulation in all the xenografts. Immunohistochemistry in the regions enriched with FAZA and Cu-ATSM in xenografts demonstrated that pimonidazole adducts were in regions that accumulated high levels of FAZA, while HIF-1α was in areas enriched with either tracer. In addition, we examined the cellular uptake of FAZA and Cu-ATSM at different levels of oxygen concentration in 4 cell lines and revealed that cellular uptake of FAZA was increased with the decrease of oxygen concentration from 20 to 2 and from 2 to 1%, while the Cu-ATSM uptake increased with the decrease of oxygen concentration from 20 to 2%, but did not increase with the decrease from 2 to 1%. Our findings indicate that intratumoral distributions of FAZA and Cu-ATSM were essentially non-overlapping and although hypoxia affects the buildup of both tracers, the accumulation of Cu-ATSM occurred at milder hypoxia compared to the conditions required for the accumulation of FAZA. Therefore, accumulation levels of FAZA and Cu-ATSM may be considered as independent biomarkers.

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