Abstract
Purpose
This study employed 3′-deoxy-3′-[18F]-fluorothymidine ([18F]FLT) microPET scanning to assess the treatment response of histone deacetylase inhibitors (HDACi), e.g., N1-hydroxy-N8-phenyloctanediamide (SAHA) and its iodinated derivative ISAHA, in a hepatoma mouse model.
Procedures
The in vitro cytotoxicity of HDACi in various hepatoma cell lines was determined by MTT assay and flow cytometry. ISAHA and SAHA were used to treat HepG2 hepatoma xenograft-bearing mice. The treatment responses were characterized in terms of tumor burden, microPET imaging, and immunohistochemical staining of tumor sections.
Results
ISAHA effectively inhibited HepG2 hepatoma cell survival and tumor growth. A significantly reduced tumor uptake during HDACi treatment was noticed in [18F]FLT microPET imaging, which was consistent with the findings in immunohistochemical staining.
Conclusions
ISAHA can suppress tumor cell proliferation both in vitro and in vivo. [18F]FLT PET is a promising modality for evaluating the in vivo therapeutic efficacy of HDACi at the early stage of treatment.
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Acknowledgments
The authors thank the financial support from National Science Council, Taiwan (NSC 101-2623-E-010-006-NU, NSC100-2623-E-010-003-NU, and NSC99-NU-E-010-003). The authors also appreciate the technical support provided by the Taiwan Mouse Clinic, National Comprehensive Mouse Phenotyping and Drug Testing Center, Taipei, Taiwan.
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The authors declare that they have no conflict of interest.
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Pei-Chia Chan and Chun-Yi Wu contribute equally to this work.
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Chan, PC., Wu, CY., Chou, LS. et al. Monitoring Tumor Response After Histone Deacetylase Inhibitor Treatment Using 3′-Deoxy-3′-[18F]-fluorothymidine PET. Mol Imaging Biol 17, 394–402 (2015). https://doi.org/10.1007/s11307-014-0774-8
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DOI: https://doi.org/10.1007/s11307-014-0774-8