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Targeting Oxidative Stress for the Treatment of Liver Fibrosis

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Part of the book series: Reviews of Physiology, Biochemistry and Pharmacology ((REVIEWS,volume 175))

Abstract

Oxidative stress is a reflection of the imbalance between the production of reactive oxygen species (ROS) and the scavenging capacity of the antioxidant system. Excessive ROS, generated from various endogenous oxidative biochemical enzymes, interferes with the normal function of liver-specific cells and presumably plays a role in the pathogenesis of liver fibrosis. Once exposed to harmful stimuli, Kupffer cells (KC) are the main effectors responsible for the generation of ROS, which consequently affect hepatic stellate cells (HSC) and hepatocytes. ROS-activated HSC undergo a phenotypic switch and deposit an excessive amount of extracellular matrix that alters the normal liver architecture and negatively affects liver function. Additionally, ROS stimulate necrosis and apoptosis of hepatocytes, which causes liver injury and leads to the progression of end-stage liver disease. In this review, we overview the role of ROS in liver fibrosis and discuss the promising therapeutic interventions related to oxidative stress. Most importantly, novel drugs that directly target the molecular pathways responsible for ROS generation, namely, mitochondrial dysfunction inhibitors, endoplasmic reticulum stress inhibitors, NADPH oxidase (NOX) inhibitors, and Toll-like receptor (TLR)-affecting agents, are reviewed in detail. In addition, challenges for targeting oxidative stress in the management of liver fibrosis are discussed.

Theerut Luangmonkong and Su Suriguga contributed equally to this work.

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Abbreviations

ADP:

Adenosine diphosphate

ALD:

Alcoholic liver disease

ALT:

Alanine transaminase

BDL:

Bile duct-ligated

Ca2+:

Calcium

CCl4:

Carbon tetrachloride

CoA:

Coenzyme A

CoQ10:

Coenzyme Q10

CYP:

Cytochrome P450

CytC:

Cytochrome C

DHA:

Docosahexaenoic acid

ECM:

Extracellular matrix

eIF2α:

Eukaryotic translation initiation factor 2 alpha

EPA:

Eicosapentaenoic acid

ER:

Endoplasmic reticulum

Ero1α:

Endoplasmic reticulum oxidoreductin 1 alpha

FADH2:

Flavin adenine dinucleotide

GSH:

Glutathione

H2O2:

Hydrogen peroxide

HBV:

Hepatitis B virus

HCV:

Hepatitis C virus

HMGB:

High-mobility group box

HNE:

4-Hydroxynonenal

HO:

Hydroxyl radical

HSC:

Hepatic stellate cells

IRAK-1:

Interleukin-1 receptor-associated kinase-1

KC:

Kupffer cells

Ldlr:

Low-density lipoprotein receptor

LPS:

Lipopolysaccharide

MDA:

Malondialdehyde

NADH:

Nicotinamide adenine dinucleotide

NAFLD:

Nonalcoholic fatty liver disease

NASH:

Nonalcoholic steatohepatitis

NFE2L2:

Nuclear factor (erythroid-derived 2)-like 2

NF-κB:

Nuclear factor kappa-light-chain-enhancer of activated B cells

NLRP3:

Nucleotide-binding domain, leucine-rich repeat family, pyrin domain-containing 3

NOX:

NADPH oxidase

O2:

Oxygen

O2•−:

Superoxide anion

PDGF:

Platelet-derived growth factor

PDI:

Protein disulfide isomerase

PERK:

Protein kinase R (PKR)-like endoplasmic reticulum kinase

ROS:

Reactive oxygen species

TGF-β:

Transforming growth factor beta

TLR:

Toll-like receptor

TNF-α:

Tumor necrosis factor alpha

UPR:

Unfolded protein response

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Conflict of Interest

No conflict of interest.

Financial Support

This work was supported by ZonMw (grant number: 114021010), China Scholarship Council, and Lundbeckfonden (grant number: R231-2016-2344).

Author’s Contributions

T. Luangmonkong and S. Suriguga, searching, analyzing, and selecting publications and drafting and editing of the manuscript; H. A. M. Mutsaers and G. Groothuis, revising of the manuscript for important intellectual content; P. Olinga, supervising the scope of the manuscript and revising the manuscript for important intellectual content; M. Boersema, reviewing the drafted manuscript and contributing important intellectual content to the final manuscript.

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Correspondence to Peter Olinga .

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Luangmonkong, T., Suriguga, S., Mutsaers, H.A.M., Groothuis, G.M.M., Olinga, P., Boersema, M. (2018). Targeting Oxidative Stress for the Treatment of Liver Fibrosis. In: Nilius, B., de Tombe, P., Gudermann, T., Jahn, R., Lill, R. (eds) Reviews of Physiology, Biochemistry and Pharmacology, Vol. 175. Reviews of Physiology, Biochemistry and Pharmacology, vol 175. Springer, Cham. https://doi.org/10.1007/112_2018_10

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