Open Access

Biological characteristics of intratumoral [F-18]‑fluoromisonidazole distribution in a rodent model of glioma

  • Authors:
    • Toshiyuki Hatano
    • Songji Zhao
    • Yan Zhao
    • Ken-Ichi Nishijima
    • Norihito  Kuno
    • Hiroko Hanzawa
    • Takeshi Sakamoto
    • Nagara Tamaki
    • Yuji Kuge
  • View Affiliations

  • Published online on: January 18, 2013     https://doi.org/10.3892/ijo.2013.1781
  • Pages: 823-830
  • Copyright: © Hatano et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].

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Abstract

Accurate imaging to identify hypoxic regions in tumors is key for radiotherapy planning. [F-18]‑fluoro­misonidazole ([F-18]-FMISO) is widely used for tumor hypoxia imaging and has the potential to optimize radiotherapy planning. However, the biological characteristics of intratumoral [F-18]-FMISO distribution have not yet been fully investigated. In hypoxic cells, the hypoxia-inducible factor-1 (HIF-1) target proteins that induce cellular proliferation and glucose metabolism, glucose transporter-1 (Glut-1) and hexokinase-II (HK-II), are upregulated. In this study, we determined the intratumoral distribution of [F-18]-FMISO by autoradiography (ARG) and compared it with pimonidazole uptake, expression of Glut-1, tumor proliferative activity (Ki-67 index) and glucose metabolism ([C-14]2-fluoro-2-deoxy-D-glucose uptake; [C-14]-FDG) in a glioma rat model. Five C6 glioma‑bearing rats were injected with [F-18]-FMISO and [C-14]-FDG. After 90 min, the rats were injected with pimonidazole and 60 min later, the rats were sacrificed and tumor tissues were sectioned into slices. The adjacent slices were used for ARG and immunohistochemical (IHC) analyses of pimonidazole, Glut-1 and Ki-67. [F-18]-FMISO ARG images were divided into regions of high [F-18]-FMISO uptake (FMISO+) and low [F-18]-FMISO uptake (FMISO-). Pimonidazole and Glut-1 expression levels, Ki-67 index and [C-14]-FDG distribution were evaluated in the regions of interest (ROIs) placed on FMISO+ and FMISO-. [F-18]-FMISO distribution was generally consistent with pimonidazole distribution. The percentage of positively stained areas (% positive) of Glut-1 in FMISO+ was significantly higher compared to FMISO- (24±8% in FMISO+ and 9±4% in FMISO-; P<0.05). There were no significant differences in Ki-67 index and [C-14]-FDG uptake between FMISO+ and FMISO- (for Ki-67, 10±5% in FMISO+ and 12±5% in FMISO-, P = ns; for [C-14]-FDG, 1.4±0.3% ID̸g̸kg in FMISO+ and 1.3±0.3% ID̸g̸kg in FMISO-, P = ns). Intratumoral [F-18]-FMISO distribution reflected tumor hypoxia and expression of the hypoxia‑related gene product Glut-1; it did not, however, reflect tumor proliferation or glucose metabolism. Our findings help elucidate the biological characteristics of intratumoral [F-18]-FMISO distribution that are relevant to radiotherapy planning.
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March 2013
Volume 42 Issue 3

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Hatano T, Zhao S, Zhao Y, Nishijima K, Kuno N, Hanzawa H, Sakamoto T, Tamaki N and Kuge Y: Biological characteristics of intratumoral [F-18]‑fluoromisonidazole distribution in a rodent model of glioma. Int J Oncol 42: 823-830, 2013
APA
Hatano, T., Zhao, S., Zhao, Y., Nishijima, K., Kuno, N., Hanzawa, H. ... Kuge, Y. (2013). Biological characteristics of intratumoral [F-18]‑fluoromisonidazole distribution in a rodent model of glioma. International Journal of Oncology, 42, 823-830. https://doi.org/10.3892/ijo.2013.1781
MLA
Hatano, T., Zhao, S., Zhao, Y., Nishijima, K., Kuno, N., Hanzawa, H., Sakamoto, T., Tamaki, N., Kuge, Y."Biological characteristics of intratumoral [F-18]‑fluoromisonidazole distribution in a rodent model of glioma". International Journal of Oncology 42.3 (2013): 823-830.
Chicago
Hatano, T., Zhao, S., Zhao, Y., Nishijima, K., Kuno, N., Hanzawa, H., Sakamoto, T., Tamaki, N., Kuge, Y."Biological characteristics of intratumoral [F-18]‑fluoromisonidazole distribution in a rodent model of glioma". International Journal of Oncology 42, no. 3 (2013): 823-830. https://doi.org/10.3892/ijo.2013.1781