Hepatic Autophagy Deficiency Compromises Farnesoid X Receptor Functionality and Causes Cholestatic Injury

Bilon Khambu, Tiangang Li, Shengmin Yan, Changshun Yu, Xiaoyun Chen, Michael Goheen, Yong Li, Jingmei Lin, Oscar W. Cummings, Youngmin A. Lee, Scott Friedman, Zheng Dong, Gen Sheng Feng, Shangwei Wu, Xiao Ming Yin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Autophagy is important for hepatic homeostasis, nutrient regeneration, and organelle quality control. We investigated the mechanisms by which liver injury occurred in the absence of autophagy function. We found that mice deficient in autophagy because of the lack of autophagy-related gene 7 or autophagy-related gene 5, key autophagy-related genes, manifested intracellular cholestasis with increased levels of serum bile acids, a higher ratio of tauromuricholic acid/taurocholic acid in the bile, increased hepatic bile acid load, abnormal bile canaliculi, and altered expression of hepatic transporters. In determining the underlying mechanism, we found that autophagy sustained and promoted the basal and up-regulated expression of farnesoid X receptor (Fxr) in the fed and starved conditions, respectively. Consequently, expression of Fxr and its downstream genes, particularly bile salt export pump, and the binding of FXR to the promoter regions of these genes, were suppressed in autophagy-deficient livers. In addition, codeletion of nuclear factor erythroid 2-related factor 2 (Nrf2) in autophagy deficiency status reversed the FXR suppression. Furthermore, the cholestatic injury of autophagy-deficient livers was reversed by enhancement of FXR activity or expression, or by Nrf2 deletion. Conclusion: Together with earlier reports that FXR can suppress autophagy, our findings indicate that autophagy and FXR form a regulatory loop and deficiency of autophagy causes abnormal FXR functionality, leading to the development of intracellular cholestasis and liver injury.

Original languageEnglish (US)
Pages (from-to)2196-2213
Number of pages18
JournalHepatology
Volume69
Issue number5
DOIs
StatePublished - May 1 2019

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Autophagy
Liver
Wounds and Injuries
Bile Acids and Salts
Genes
Cholestasis
Bile Canaliculi
Taurocholic Acid
Genetic Promoter Regions
Bile
Quality Control
Organelles
Regeneration
Homeostasis

ASJC Scopus subject areas

  • Hepatology

Cite this

Khambu, B., Li, T., Yan, S., Yu, C., Chen, X., Goheen, M., ... Yin, X. M. (2019). Hepatic Autophagy Deficiency Compromises Farnesoid X Receptor Functionality and Causes Cholestatic Injury. Hepatology, 69(5), 2196-2213. https://doi.org/10.1002/hep.30407

Hepatic Autophagy Deficiency Compromises Farnesoid X Receptor Functionality and Causes Cholestatic Injury. / Khambu, Bilon; Li, Tiangang; Yan, Shengmin; Yu, Changshun; Chen, Xiaoyun; Goheen, Michael; Li, Yong; Lin, Jingmei; Cummings, Oscar W.; Lee, Youngmin A.; Friedman, Scott; Dong, Zheng; Feng, Gen Sheng; Wu, Shangwei; Yin, Xiao Ming.

In: Hepatology, Vol. 69, No. 5, 01.05.2019, p. 2196-2213.

Research output: Contribution to journalArticle

Khambu, B, Li, T, Yan, S, Yu, C, Chen, X, Goheen, M, Li, Y, Lin, J, Cummings, OW, Lee, YA, Friedman, S, Dong, Z, Feng, GS, Wu, S & Yin, XM 2019, 'Hepatic Autophagy Deficiency Compromises Farnesoid X Receptor Functionality and Causes Cholestatic Injury', Hepatology, vol. 69, no. 5, pp. 2196-2213. https://doi.org/10.1002/hep.30407
Khambu, Bilon ; Li, Tiangang ; Yan, Shengmin ; Yu, Changshun ; Chen, Xiaoyun ; Goheen, Michael ; Li, Yong ; Lin, Jingmei ; Cummings, Oscar W. ; Lee, Youngmin A. ; Friedman, Scott ; Dong, Zheng ; Feng, Gen Sheng ; Wu, Shangwei ; Yin, Xiao Ming. / Hepatic Autophagy Deficiency Compromises Farnesoid X Receptor Functionality and Causes Cholestatic Injury. In: Hepatology. 2019 ; Vol. 69, No. 5. pp. 2196-2213.
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AU - Yu, Changshun

AU - Chen, Xiaoyun

AU - Goheen, Michael

AU - Li, Yong

AU - Lin, Jingmei

AU - Cummings, Oscar W.

AU - Lee, Youngmin A.

AU - Friedman, Scott

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AU - Wu, Shangwei

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AB - Autophagy is important for hepatic homeostasis, nutrient regeneration, and organelle quality control. We investigated the mechanisms by which liver injury occurred in the absence of autophagy function. We found that mice deficient in autophagy because of the lack of autophagy-related gene 7 or autophagy-related gene 5, key autophagy-related genes, manifested intracellular cholestasis with increased levels of serum bile acids, a higher ratio of tauromuricholic acid/taurocholic acid in the bile, increased hepatic bile acid load, abnormal bile canaliculi, and altered expression of hepatic transporters. In determining the underlying mechanism, we found that autophagy sustained and promoted the basal and up-regulated expression of farnesoid X receptor (Fxr) in the fed and starved conditions, respectively. Consequently, expression of Fxr and its downstream genes, particularly bile salt export pump, and the binding of FXR to the promoter regions of these genes, were suppressed in autophagy-deficient livers. In addition, codeletion of nuclear factor erythroid 2-related factor 2 (Nrf2) in autophagy deficiency status reversed the FXR suppression. Furthermore, the cholestatic injury of autophagy-deficient livers was reversed by enhancement of FXR activity or expression, or by Nrf2 deletion. Conclusion: Together with earlier reports that FXR can suppress autophagy, our findings indicate that autophagy and FXR form a regulatory loop and deficiency of autophagy causes abnormal FXR functionality, leading to the development of intracellular cholestasis and liver injury.

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