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2015 ; 5
(ä): 17327
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Utility of Translocator Protein (18?kDa) as a Molecular Imaging Biomarker to
Monitor the Progression of Liver Fibrosis
#MMPMID26612465
Hatori A
; Yui J
; Xie L
; Kumata K
; Yamasaki T
; Fujinaga M
; Wakizaka H
; Ogawa M
; Nengaki N
; Kawamura K
; Wang F
; Zhang MR
Sci Rep
2015[Nov]; 5
(ä): 17327
PMID26612465
show ga
Hepatic fibrosis is the wound healing response to chronic hepatic injury caused
by various factors. In this study, we aimed to evaluate the utility of
translocator protein (18?kDa) (TSPO) as a molecular imaging biomarker for
monitoring the progression of hepatic fibrosis to cirrhosis. Model rats were
induced by carbon tetrachloride (CCl4), and liver fibrosis was assessed. Positron
emission tomography (PET) with
N-benzyl-N-methyl-2-[7,8-dihydro-7-(2-[(18)F]fluoroethyl)-8-oxo-2-phenyl-9H-purin-9-yl]-acetamide
([(18)F]FEDAC), a radioprobe specific for TSPO, was used for noninvasive
visualisation in vivo. PET scanning, immunohistochemical staining, ex vivo
autoradiography, and quantitative reverse-transcription polymerase chain reaction
were performed to elucidate the relationships among radioactivity uptake, TSPO
levels, and cellular sources enriching TSPO expression in damaged livers. PET
showed that uptake of radioactivity in livers increased significantly after 2, 4,
6, and 8 weeks of CCl4 treatment. Immunohistochemistry demonstrated that TSPO was
mainly expressed in macrophages and hepatic stellate cells (HSCs).
TSPO-expressing macrophages and HSCs increased with the progression of liver
fibrosis. Interestingly, the distribution of radioactivity from [(18)F]FEDAC was
well correlated with TSPO expression, and TSPO mRNA levels increased with the
severity of liver damage. TSPO was a useful molecular imaging biomarker and could
be used to track the progression of hepatic fibrosis to cirrhosis with PET.