KMID : 1188320180120040449
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Gut and Liver 2018 Volume.12 No. 4 p.449 ~ p.456
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Expression of Fibroblast Growth Factor 21 and ¥â-Klotho Regulates Hepatic Fibrosis through the Nuclear Factor-¥êB and c-Jun N-Terminal Kinase Pathways
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Lee Kyong-Joo
Jang Yoon-Ok Cha Seung-Kuy Kim Moon-Young Park Kyu-Sang Eom Young-Woo Baik Soon-Koo
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Abstract
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Background/Aims: Fibroblast growth factor (FGF) 21 is associated with hepatic inflammation and fibrosis. However, little is known regarding the effects of inflammation and fibrosis on the ¥â-Klotho and FGF21 pathway in the liver.
Methods: Enrolled patients had biopsy-confirmed viral or alcoholic hepatitis. FGF19, FGF21 and ¥â-Klotho levels were evaluated using enzyme-linked immunosorbent assay, real-time polymerase chain reaction, and Western blotting. Furthermore, we explored the underlying mechanisms for this process by evaluating nuclear factor-¥êB (NF-¥êB) and c-Jun N-terminal kinase (JNK) pathway involvement in Huh-7 cells.
Results: We observed that the FGF19 and FGF21 serum and mRNA levels in the biopsied liver tissue gradually increased and were correlated with fibrosis stage. Inflammatory markers (interleukin 1¥â [IL-1¥â], IL-6, and tumor necrosis factor-¥á) were positively correlated, while ¥â-Klotho expression was negatively correlated with the degree of fibrosis. In Huh-7 cells, IL-1¥â increased FGF21 levels and decreased ¥â-Klotho levels. NF-¥êB and JNK inhibitors abolished the effect of IL-1¥â on both FGF21 and ¥â-Klotho expression. FGF21 protected IL-1¥â-induced growth retardation in Huh-7 cells.
Conclusions: These results indicate that the inflammatory response during fibrogenesis increases FGF21 levels and suppresses ¥â-Klotho via the NF-¥êB and JNK pathway. In addition, FGF21 likely protects hepatocytes from hepatic inflammation and fibrosis.
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KEYWORD
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Fibroblast growth factor 21, ¥â-Klotho, Interleukin-1beta, NF-kappa B, JNK
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