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2016 ; 65
(5
): 840-51
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Kinase analysis in alcoholic hepatitis identifies p90RSK as a potential mediator
of liver fibrogenesis
#MMPMID25652085
Morales-Ibanez O
; Affò S
; Rodrigo-Torres D
; Blaya D
; Millán C
; Coll M
; Perea L
; Odena G
; Knorpp T
; Templin MF
; Moreno M
; Altamirano J
; Miquel R
; Arroyo V
; Ginès P
; Caballería J
; Sancho-Bru P
; Bataller R
Gut
2016[May]; 65
(5
): 840-51
PMID25652085
show ga
OBJECTIVE: Alcoholic hepatitis (AH) is often associated with advanced fibrosis,
which negatively impacts survival. We aimed at identifying kinases deregulated in
livers from patients with AH and advanced fibrosis in order to discover novel
molecular targets. DESIGN: Extensive phosphoprotein analysis by reverse phase
protein microarrays was performed in AH (n=12) and normal human livers (n=7).
Ribosomal S6 kinase (p90RSK) hepatic expression was assessed by qPCR, Western
blot and immunohistochemistry. Kaempferol was used as a selective pharmacological
inhibitor of the p90RSK pathway to assess the regulation of
experimentally-induced liver fibrosis and injury, using in vivo and in vitro
approaches. RESULTS: Proteomic analysis identified p90RSK as one of the most
deregulated kinases in AH. Hepatic p90RSK gene and protein expression was also
upregulated in livers with chronic liver disease. Immunohistochemistry studies
showed increased p90RSK staining in areas of active fibrogenesis in cirrhotic
livers. Therapeutic administration of kaempferol to carbon tetrachloride-treated
mice resulted in decreased hepatic collagen deposition, and expression of
profibrogenic and proinflammatory genes, compared to vehicle administration. In
addition, kaempferol reduced the extent of hepatocellular injury and degree of
apoptosis. In primary hepatic stellate cells, kaempferol and small interfering
RNA decreased activation of p90RSK, which in turn regulated key profibrogenic
actions. In primary hepatocytes, kaempferol attenuated proapoptotic signalling.
CONCLUSIONS: p90RSK is upregulated in patients with chronic liver disease and
mediates liver fibrogenesis in vivo and in vitro. These results suggest that the
p90RSK pathway could be a new therapeutic approach for liver diseases
characterised by advanced fibrosis.