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2016 ; 63
(4
): 1155-69
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Inhibition of hedgehog signaling ameliorates hepatic inflammation in mice with
nonalcoholic fatty liver disease
#MMPMID26473743
Kwon H
; Song K
; Han C
; Chen W
; Wang Y
; Dash S
; Lim K
; Wu T
Hepatology
2016[Apr]; 63
(4
): 1155-69
PMID26473743
show ga
Hedgehog (Hh) signaling plays a critical role in liver development, regeneration,
injury repair, and carcinogenesis. Activation of Hh signaling has been observed
in patients with nonalcoholic fatty liver diseases (NAFLD); however, the
pathobiological function and regulatory mechanism of hepatic Hh signaling in the
pathogenesis of NAFLD remain to be further defined. This study was designed to
examine the effect and mechanism of hepatic Hh signaling in high-fat diet-induced
NAFLD by using pharmacological Smoothened (Smo) inhibitors (GDC-0449 and LED225)
and liver-specific Smo knockout mice. Administration of Smo inhibitors to
high-fat diet-fed wild-type mice significantly reduced the numbers of activated
macrophages and decreased the expression of proinflammatory cytokines (tumor
necrosis factor-?, interleukin-1?, monocyte chemoattractant protein 1, and
interleukin-6) as assessed by F4/80 immunohistochemistry and quantitative
reverse-transcription polymerase chain reaction, respectively. The Smo inhibitors
were noted to have variable effects on hepatic fat accumulation. Liver-specific
deletion of Smo also reduced macrophage activation and inhibited proinflammatory
cytokine expression, while it did not significantly alter fat accumulation in the
liver. Mechanistically, we found that activation of glioma-associated oncogene 1
by Hh signaling in primary hepatocytes increased the production of osteopontin,
which subsequently enhanced the macrophage-mediated proinflammatory response
through paracrine signaling. CONCLUSION: Hepatocyte Hh signaling can promote
liver inflammation through osteopontin-mediated macrophage activation; this
mechanism importantly contributes to the progression of NAFLD.
|*Diet, High-Fat
[MESH]
|Anilides/*pharmacology
[MESH]
|Animals
[MESH]
|Biopsy, Needle
[MESH]
|Cells, Cultured
[MESH]
|Disease Models, Animal
[MESH]
|Hedgehog Proteins/*metabolism
[MESH]
|Immunohistochemistry
[MESH]
|Inflammation/*drug therapy/prevention & control
[MESH]