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2018 ; 50
(4
): 1-13
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Altered AKAP12 expression in portal fibroblasts and liver sinusoids mediates
transition from hepatic fibrogenesis to fibrosis resolution
#MMPMID29700280
Lee HS
; Choi J
; Son T
; Wee HJ
; Bae SJ
; Seo JH
; Park JH
; Ryu SH
; Lee D
; Jang MK
; Yu E
; Chung YH
; Kim KW
Exp Mol Med
2018[Apr]; 50
(4
): 1-13
PMID29700280
show ga
Liver fibrosis can be reversed by removing its causative injuries; however, the
molecular mechanisms mediating the resolution of liver fibrogenesis are poorly
understood. We investigate the role of a scaffold protein, A-Kinase Anchoring
Protein 12 (AKAP12), during liver fibrosis onset, and resolution. Biliary
fibrogenesis and fibrosis resolution was induced in wild-type (WT) or
AKAP12-deficient C57BL/6 mice through different feeding regimens with 0.1%
3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC)-containing chow. AKAP12
expression in portal fibroblasts (PFs) and liver sinusoidal endothelial cells
(LSECs) gradually decreased as fibrosis progressed but was restored after
cessation of the fibrotic challenge. Histological analysis of human liver
specimens with varying degrees of fibrosis of different etiologies revealed that
AKAP12 expression diminishes in hepatic fibrosis from its early stages onward.
AKAP12 KO mice displayed reduced fibrosis resolution in a DDC-induced biliary
fibrosis model, which was accompanied by impaired normalization of myofibroblasts
and capillarized sinusoids. RNA sequencing of the liver transcriptome revealed
that genes related to ECM accumulation and vascular remodeling were mostly
elevated in AKAP12 KO samples. Gene ontology (GO) and bioinformatic pathway
analyses identified that the differentially expressed genes were significantly
enriched in GO categories and pathways, such as the adenosine 3',5'-cyclic
monophosphate (cAMP) pathway. Knockdown of the AKAP12 gene in cultured primary
PFs revealed that AKAP12 inhibited PF activation in association with the
adenosine 3',5'-cyclic monophosphate (cAMP) pathway. Moreover, AKAP12 knockdown
in LSECs led to enhanced angiogenesis, endothelin-1 expression and alterations in
laminin composition. Collectively, this study demonstrates that AKAP12-mediated
regulation of PFs and LSECs has a central role in resolving hepatic fibrosis.