Translocator protein (18 kDa), a potential molecular imaging biomarker for non-invasively distinguishing non-alcoholic fatty liver disease.
Autor: | Xie L; Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan., Yui J, Hatori A, Yamasaki T, Kumata K, Wakizaka H, Yoshida Y, Fujinaga M, Kawamura K, Zhang MR |
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Jazyk: | angličtina |
Zdroj: | Journal of hepatology [J Hepatol] 2012 Nov; Vol. 57 (5), pp. 1076-82. Date of Electronic Publication: 2012 Jul 11. |
DOI: | 10.1016/j.jhep.2012.07.002 |
Abstrakt: | Background & Aims: Mitochondrial dysfunction is responsible for liver damage and disease progression in non-alcoholic fatty liver disease (NAFLD). Translocator protein (18 kDa) (TSPO), a mitochondrial transmembrane protein, plays important roles in modulating mitochondrial function. This study explored whether TSPO can be used as an imaging biomarker of non-invasive diagnosis and staging of NAFLD, monitored using positron emission tomography (PET) with a TSPO radioligand [(18)F]FEDAC. Methods: PET with [(18)F]FEDAC, non-enhanced computerized tomography (CT), autoradiography, histopathology, and gene analysis were performed to evaluate and quantify TSPO levels and NAFLD progression in methionine and choline-deficient diet-fed mice. Correlations were analyzed between uptake ratio of radioactivity and NAFLD activity score (NAS) in the liver. Results: Uptake of [(18)F]FEDAC obviously increased with disease progression from simple steatosis to non-alcoholic steatohepatitis (NASH) (p<0.01). A close correlation was identified between [(18)F]FEDAC uptake ratio and NAS in the liver (Pearson's r=0.922, p=0.000). Specific binding of [(18)F]FEDAC to TSPO in the NAFLD livers was assessed in competition studies with the unlabelled TSPO-selective ligand PK11195. Autoradiography and histopathology confirmed the PET imaging results. Further, the mRNA levels of the functional macromolecular signaling complex composed of TSPO were obviously higher compared to controls. Conclusions: TSPO expression increases in NAFLD and closely correlates with NAFLD progression. TSPO as a specific molecular imaging biomarker may open a novel avenue for non-invasive, reliable, and quantitative diagnosis and staging of NAFLD. (Copyright © 2012 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.) |
Databáze: | MEDLINE |
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