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  1. Article ; Online: Alteration of mitochondrial DNA homeostasis in drug-induced liver injury.

    Fromenty, Bernard

    Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association

    2019  Volume 135, Page(s) 110916

    Abstract: Mitochondrial DNA (mtDNA) encodes for 13 proteins involved in the oxidative phosphorylation (OXPHOS) process. In liver, genetic or acquired impairment of mtDNA homeostasis can reduce ATP output but also decrease fatty acid oxidation, thus leading to ... ...

    Abstract Mitochondrial DNA (mtDNA) encodes for 13 proteins involved in the oxidative phosphorylation (OXPHOS) process. In liver, genetic or acquired impairment of mtDNA homeostasis can reduce ATP output but also decrease fatty acid oxidation, thus leading to different hepatic lesions including massive necrosis and microvesicular steatosis. Hence, a severe impairment of mtDNA homeostasis can lead to liver failure and death. An increasing number of investigations report that some drugs can induce mitochondrial dysfunction and drug-induced liver injury (DILI) by altering mtDNA homeostasis. Some drugs such as ciprofloxacin, antiretroviral nucleoside reverse-transcriptase inhibitors and tacrine can inhibit hepatic mtDNA replication, thus inducing mtDNA depletion. Drug-induced reduced mtDNA levels can also be the consequence of reactive oxygen species-mediated oxidative damage to mtDNA, which triggers its degradation by mitochondrial nucleases. Such mechanism is suspected for acetaminophen and troglitazone. Other pharmaceuticals such as linezolid and tetracyclines can impair mtDNA translation, thus selectively reducing the synthesis of the 13 mtDNA-encoded proteins. Lastly, some drugs might alter the mtDNA methylation status but the pathophysiological consequences of such alteration are still unclear. Drug-induced impairment of mtDNA homeostasis is probably under-recognized since preclinical and post-marketing safety studies do not classically investigate mtDNA levels, mitochondrial protein synthesis and mtDNA oxidative damage.
    MeSH term(s) Animals ; Anti-Infective Agents/adverse effects ; Antineoplastic Agents/adverse effects ; Chemical and Drug Induced Liver Injury/metabolism ; DNA Damage/drug effects ; DNA Replication/drug effects ; DNA, Mitochondrial/metabolism ; Homeostasis/physiology ; Humans ; Mitochondria/drug effects ; Protein Biosynthesis/drug effects
    Chemical Substances Anti-Infective Agents ; Antineoplastic Agents ; DNA, Mitochondrial
    Language English
    Publishing date 2019-10-25
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 782617-5
    ISSN 1873-6351 ; 0278-6915
    ISSN (online) 1873-6351
    ISSN 0278-6915
    DOI 10.1016/j.fct.2019.110916
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  2. Article ; Online: Letter to the Editor Regarding the Article Rotenone Increases Isoniazid Toxicity but Does Not Cause Significant Liver Injury: Implications for the Hypothesis that Inhibition of the Mitochondrial Electron Transport Chain Is a Common Mechanism of Idiosyncratic Drug-Induced Liver Injury by Cho and Co-Workers, 2019.

    Fromenty, Bernard

    Chemical research in toxicology

    2019  Volume 33, Issue 1, Page(s) 2–4

    MeSH term(s) Chemical and Drug Induced Liver Injury ; Electron Transport ; Humans ; Isoniazid ; Rotenone
    Chemical Substances Rotenone (03L9OT429T) ; Isoniazid (V83O1VOZ8L)
    Language English
    Publishing date 2019-12-17
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 639353-6
    ISSN 1520-5010 ; 0893-228X
    ISSN (online) 1520-5010
    ISSN 0893-228X
    DOI 10.1021/acs.chemrestox.9b00416
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  3. Article ; Online: Mitochondrial alterations in fatty liver diseases.

    Fromenty, Bernard / Roden, Michael

    Journal of hepatology

    2022  Volume 78, Issue 2, Page(s) 415–429

    Abstract: Fatty liver diseases can result from common metabolic diseases, as well as from xenobiotic exposure and excessive alcohol use, all of which have been shown to exert toxic effects on hepatic mitochondrial functionality and dynamics. Invasive or complex ... ...

    Abstract Fatty liver diseases can result from common metabolic diseases, as well as from xenobiotic exposure and excessive alcohol use, all of which have been shown to exert toxic effects on hepatic mitochondrial functionality and dynamics. Invasive or complex methodology limits large-scale investigations of mitochondria in human livers. Nevertheless, abnormal mitochondrial function, such as impaired fatty acid oxidation and oxidative phosphorylation, drives oxidative stress and has been identified as an important feature of human steatohepatitis. On the other hand, hepatic mitochondria can be flexible and adapt to the ambient metabolic condition to prevent triglyceride and lipotoxin accumulation in obesity. Experience from studies on xenobiotics has provided important insights into the regulation of hepatic mitochondria. Increasing awareness of the joint presence of metabolic disease-related (lipotoxic) and alcohol-related liver diseases further highlights the need to better understand their mutual interaction and potentiation in disease progression. Recent clinical studies have assessed the effects of diets or bariatric surgery on hepatic mitochondria, which are also evolving as an interesting therapeutic target in non-alcoholic fatty liver disease. This review summarises the current knowledge on hepatic mitochondria with a focus on fatty liver diseases linked to obesity, type 2 diabetes and xenobiotics.
    MeSH term(s) Humans ; Non-alcoholic Fatty Liver Disease/metabolism ; Diabetes Mellitus, Type 2/metabolism ; Liver/metabolism ; Mitochondria/metabolism ; Obesity/complications ; Obesity/metabolism
    Language English
    Publishing date 2022-10-07
    Publishing country Netherlands
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 605953-3
    ISSN 1600-0641 ; 0168-8278
    ISSN (online) 1600-0641
    ISSN 0168-8278
    DOI 10.1016/j.jhep.2022.09.020
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  4. Article: Alteration of mitochondrial DNA homeostasis in drug-induced liver injury

    Fromenty, Bernard

    Food and chemical toxicology. 2020 Jan., v. 135

    2020  

    Abstract: Mitochondrial DNA (mtDNA) encodes for 13 proteins involved in the oxidative phosphorylation (OXPHOS) process. In liver, genetic or acquired impairment of mtDNA homeostasis can reduce ATP output but also decrease fatty acid oxidation, thus leading to ... ...

    Abstract Mitochondrial DNA (mtDNA) encodes for 13 proteins involved in the oxidative phosphorylation (OXPHOS) process. In liver, genetic or acquired impairment of mtDNA homeostasis can reduce ATP output but also decrease fatty acid oxidation, thus leading to different hepatic lesions including massive necrosis and microvesicular steatosis. Hence, a severe impairment of mtDNA homeostasis can lead to liver failure and death. An increasing number of investigations report that some drugs can induce mitochondrial dysfunction and drug-induced liver injury (DILI) by altering mtDNA homeostasis. Some drugs such as ciprofloxacin, antiretroviral nucleoside reverse-transcriptase inhibitors and tacrine can inhibit hepatic mtDNA replication, thus inducing mtDNA depletion. Drug-induced reduced mtDNA levels can also be the consequence of reactive oxygen species-mediated oxidative damage to mtDNA, which triggers its degradation by mitochondrial nucleases. Such mechanism is suspected for acetaminophen and troglitazone. Other pharmaceuticals such as linezolid and tetracyclines can impair mtDNA translation, thus selectively reducing the synthesis of the 13 mtDNA-encoded proteins. Lastly, some drugs might alter the mtDNA methylation status but the pathophysiological consequences of such alteration are still unclear. Drug-induced impairment of mtDNA homeostasis is probably under-recognized since preclinical and post-marketing safety studies do not classically investigate mtDNA levels, mitochondrial protein synthesis and mtDNA oxidative damage.
    Keywords RNA-directed DNA polymerase ; acetaminophen ; adenosine triphosphate ; antiretroviral agents ; beta oxidation ; ciprofloxacin ; death ; enzyme inhibitors ; homeostasis ; linezolid ; liver ; liver failure ; methylation ; mitochondria ; mitochondrial DNA ; necrosis ; nucleases ; nucleosides ; oxidative phosphorylation ; oxygen ; protein synthesis ; proteins ; tetracyclines ; translation (genetics)
    Language English
    Dates of publication 2020-01
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 782617-5
    ISSN 1873-6351 ; 0278-6915
    ISSN (online) 1873-6351
    ISSN 0278-6915
    DOI 10.1016/j.fct.2019.110916
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  5. Article ; Online: Burn after feeding. An old uncoupler of oxidative phosphorylation is redesigned for the treatment of nonalcoholic fatty liver disease.

    Fromenty, B

    Clinics and research in hepatology and gastroenterology

    2014  Volume 38, Issue 5, Page(s) 545–549

    Abstract: Uncoupling of oxidative phosphorylation (OXPHOS) in brown adipose tissue can be used by hibernating animals to produce heat at the expense of their fat mass. In a recent work, Dr Shulman et al. generated a liver-targeted derivative of the prototypical ... ...

    Abstract Uncoupling of oxidative phosphorylation (OXPHOS) in brown adipose tissue can be used by hibernating animals to produce heat at the expense of their fat mass. In a recent work, Dr Shulman et al. generated a liver-targeted derivative of the prototypical OXPHOS uncoupler 2,4-dinitrophenol that alleviated steatosis, hypertriglyceridemia and insulin resistance in several models of nonalcoholic fatty liver disease and type 2 diabetes.
    MeSH term(s) 2,4-Dinitrophenol/therapeutic use ; Animals ; Mice ; Non-alcoholic Fatty Liver Disease/drug therapy ; Non-alcoholic Fatty Liver Disease/metabolism ; Oxidative Phosphorylation ; Rats ; Uncoupling Agents/therapeutic use
    Chemical Substances Uncoupling Agents ; 2,4-Dinitrophenol (Q13SKS21MN)
    Language English
    Publishing date 2014-10
    Publishing country France
    Document type Journal Article
    ZDB-ID 2594333-9
    ISSN 2210-741X ; 2210-7401
    ISSN (online) 2210-741X
    ISSN 2210-7401
    DOI 10.1016/j.clinre.2014.04.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Xenobiotic-Induced Aggravation of Metabolic-Associated Fatty Liver Disease.

    Massart, Julie / Begriche, Karima / Corlu, Anne / Fromenty, Bernard

    International journal of molecular sciences

    2022  Volume 23, Issue 3

    Abstract: Metabolic-associated fatty liver disease (MAFLD), which is often linked to obesity, encompasses a large spectrum of hepatic lesions, including simple fatty liver, steatohepatitis, cirrhosis and hepatocellular carcinoma. Besides nutritional and genetic ... ...

    Abstract Metabolic-associated fatty liver disease (MAFLD), which is often linked to obesity, encompasses a large spectrum of hepatic lesions, including simple fatty liver, steatohepatitis, cirrhosis and hepatocellular carcinoma. Besides nutritional and genetic factors, different xenobiotics such as pharmaceuticals and environmental toxicants are suspected to aggravate MAFLD in obese individuals. More specifically, pre-existing fatty liver or steatohepatitis may worsen, or fatty liver may progress faster to steatohepatitis in treated patients, or exposed individuals. The mechanisms whereby xenobiotics can aggravate MAFLD are still poorly understood and are currently under deep investigations. Nevertheless, previous studies pointed to the role of different metabolic pathways and cellular events such as activation of de novo lipogenesis and mitochondrial dysfunction, mostly associated with reactive oxygen species overproduction. This review presents the available data gathered with some prototypic compounds with a focus on corticosteroids and rosiglitazone for pharmaceuticals as well as bisphenol A and perfluorooctanoic acid for endocrine disruptors. Although not typically considered as a xenobiotic, ethanol is also discussed because its abuse has dire consequences on obese liver.
    MeSH term(s) Humans ; Lipogenesis ; Liver/metabolism ; Non-alcoholic Fatty Liver Disease/metabolism ; Obesity/metabolism ; Xenobiotics/adverse effects ; Xenobiotics/metabolism
    Chemical Substances Xenobiotics
    Language English
    Publishing date 2022-01-19
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms23031062
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  7. Article ; Online: Bridging the gap between old and new concepts in drug-induced liver injury.

    Fromenty, B

    Clinics and research in hepatology and gastroenterology

    2013  Volume 37, Issue 1, Page(s) 6–9

    Abstract: Recent studies have provided important information in the field of drug-induced liver injury (DILI), in particular regarding the pathogenesis of acetaminophen hepatotoxicity. However, these studies have sometimes left aside some old (but seminal) ... ...

    Abstract Recent studies have provided important information in the field of drug-induced liver injury (DILI), in particular regarding the pathogenesis of acetaminophen hepatotoxicity. However, these studies have sometimes left aside some old (but seminal) findings. Efforts should be made to bridge the gap between old and new concepts in DILI.
    MeSH term(s) Chemical and Drug Induced Liver Injury/etiology ; Humans
    Language English
    Publishing date 2013-02
    Publishing country France
    Document type Journal Article
    ZDB-ID 2594333-9
    ISSN 2210-741X ; 2210-7401
    ISSN (online) 2210-741X
    ISSN 2210-7401
    DOI 10.1016/j.clinre.2012.12.003
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  8. Article ; Online: Fat accretion in a subpopulation of hepatocytes as a strategy to protect the whole liver against oxidative stress and lipotoxicity.

    Fromenty, B

    Clinics and research in hepatology and gastroenterology

    2013  Volume 37, Issue 6, Page(s) 553–555

    Abstract: Fatty liver can be induced by obesity, some drugs and alcohol intoxication. In this liver lesion, lipid accumulation can involve only some hepatocytes but the significance of this cell-to-cell heterogeneity is unknown. In a recent work, Dr Pol et al. ... ...

    Abstract Fatty liver can be induced by obesity, some drugs and alcohol intoxication. In this liver lesion, lipid accumulation can involve only some hepatocytes but the significance of this cell-to-cell heterogeneity is unknown. In a recent work, Dr Pol et al. propose that high-fat hepatocytes could protect the cell population against oxidative stress and lipotoxicity.
    MeSH term(s) Animals ; Hepatocytes/cytology ; Lipid Metabolism ; Lipids/chemistry
    Chemical Substances Lipids
    Language English
    Publishing date 2013-12
    Publishing country France
    Document type Comment ; Journal Article
    ZDB-ID 2594333-9
    ISSN 2210-741X ; 2210-7401
    ISSN (online) 2210-741X
    ISSN 2210-7401
    DOI 10.1016/j.clinre.2013.08.005
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  9. Article ; Online: Rôle des acides gras dans l’induction du cytochrome P450 2E1 hépatique : implication dans l’étiologie de la stéatohépatite non alcoolique et dans l’hépatotoxicité du paracétamol

    Penhoat, C. / Massart, J. / Fromenty, B. / Begriche, K.

    Nutrition clinique et métabolisme. 2023 May, v. 37, no. 2, p. e77-e78

    2023  

    Abstract: ... dans les hépatocytes par le transporteur CD36/FAT et une diminution de la b-oxydation mitochondriale. Les effets ...

    Abstract La stéatose hépatique (non-alcoholic fatty liver [NAFL]) est caractérisée par une accumulation excessive de triglycérides dans le foie et touche aujourd’hui un quart de la population mondiale. Bien que souvent bénigne, la NAFL peut progressivement évoluer vers une stéatohépatite non alcoolique (non-alcoholic steatohepatitis [NASH]), une lésion potentiellement plus grave définie par la présence concomitante d’une NAFL, de lésions nécro-inflammatoires évolutives et d’un ballonnement hépatocytaire. La NASH peut elle-même être à l’origine d’une cirrhose voire d’un carcinome hépatocellulaire. Une meilleure compréhension des mécanismes d’aggravation de la NAFL vers la NASH représente donc un enjeu majeur de santé publique. Plusieurs études ont mis en évidence que le cytochrome P450 2E1 (CYP2E1) pourrait être impliqué dans ces mécanismes d’aggravation. L’induction du CYP2E1 a en effet pour particularité de générer des espèces réactives de l’oxygène (EROs) qui sont sources d’un stress oxydant propice à l’aggravation de la NAFL en NASH. Des travaux ont rapporté le rôle de certains acides gras (AGs) parmi les facteurs métaboliques susceptibles d’activer le CYP2E1, en particulier dans un contexte d’obésité et/ou de NAFL. Outre son rôle potentiel dans l’aggravation de la NAFL en NASH, le CYP2E1 est impliqué dans la toxicité hépatique du paracétamol (PRC), observée généralement après un surdosage (>10g/j) intentionnel ou non, et plus rarement au cours de traitements à des doses pharmacologiques (3–4g/j). Ainsi, le PRC pourrait être plus toxique dans un contexte de NAFL et d’obésité. Afin d’identifier plus précisément l’impact de différents AGs sur l’induction du CYP2E1, la NAFL et sur la toxicité du PRC, la lignée d’hépatocarcinome humain HepaRG a été utilisée. Ces cellules ont été traitées pendant une semaine par neuf AGs différents (150μM). Un traitement par le PRC (10 ou 20mM) pendant les 24 dernières heures a également été réalisé. L’activité du CYP2E1 a été significativement induite par les AGs palmitique (PA), stéarique (SA) et linoléique (LA) dans notre modèle. Pour le PA et le SA, les mécanismes impliqués passeraient par une augmentation de la stabilité de la protéine CYP2E1. Concernant la NAFL, uniquement le LA a favorisé une accumulation significative de triglycérides intracellulaires ainsi que l’expression de certains gènes représentatifs des gouttelettes lipidiques. Pour cet AG, l’accumulation des triglycérides pourrait s’expliquer par une augmentation de l’entrée des AGs dans les hépatocytes par le transporteur CD36/FAT et une diminution de la b-oxydation mitochondriale. Les effets de ces trois AGs sur le stress oxydant, le stress du réticulum endoplasmique et la fonction mitochondriale ont ensuite été évalués. Après une semaine de traitement, aucune variation de stress cellulaire n’a été mesurée. En revanche, une diminution de la respiration maximale a été observée en réponse aux AGs PA et SA. Enfin, une potentialisation de la toxicité du PRC a été observée avec les AGs PA et SA mais pas avec le LA. Le stress oxydant a ensuite été évalué au vu de son importance dans l’hépatotoxicité du PRC. Une potentialisation de la production d’EROs ainsi qu’une altération de la réponse antioxydante ont été mises en évidence avec les AGs PA et SA. Trois AGs inducteurs du CYP2E1 (c.-à-d. PA, SA et LA) ont été identifiés. De façon intéressante, ces AGs n’ont pas tous le même impact sur la NAFL dans nos conditions expérimentales puisque seul le LA entraînait une stéatose. En effet, le métabolisme lipidique hépatocytaire s’effectue de manière différente selon le traitement en AG. De plus, une potentialisation de la toxicité du PRC avec les AGs PA et SA et un stress oxydant avec ces deux AGs ont également été mis en évidence. Ainsi, la sensibilité accrue à l’hépatotoxicité du PRC dans un contexte de nutrition hyperlipidique et de NAFL pourrait en partie être expliquée par l’induction du CYP2E1, qui cependant peut s’observer expérimentalement de façon indépendante de l’accumulation des triglycérides intracellulaires.
    Keywords cytochrome P-450 ; fatty liver ; nutrition
    Language English
    Dates of publication 2023-05
    Size p. e77-e78
    Publishing place Elsevier Masson SAS
    Document type Article ; Online
    ZDB-ID 1131758-9
    ISSN 0985-0562
    ISSN 0985-0562
    DOI 10.1016/j.nupar.2023.03.142
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  10. Article ; Online: Busulfan induces steatosis in HepaRG cells but not in primary human hepatocytes: Possible explanations and implication for the prediction of drug-induced liver injury.

    Allard, Julien / Bucher, Simon / Ferron, Pierre-Jean / Launay, Youenn / Fromenty, Bernard

    Fundamental & clinical pharmacology

    2023  Volume 38, Issue 1, Page(s) 152–167

    Abstract: Background: The antineoplastic drug busulfan can induce different hepatic lesions including cholestasis and sinusoidal obstruction syndrome. However, hepatic steatosis has never been reported in patients.: Objectives: This study aimed to determine ... ...

    Abstract Background: The antineoplastic drug busulfan can induce different hepatic lesions including cholestasis and sinusoidal obstruction syndrome. However, hepatic steatosis has never been reported in patients.
    Objectives: This study aimed to determine whether busulfan could induce steatosis in primary human hepatocytes (PHH) and differentiated HepaRG cells.
    Methods: Neutral lipids were determined in PHH and HepaRG cells. Mechanistic investigations were performed in HepaRG cells by measuring metabolic fluxes linked to lipid homeostasis, reduced glutathione (GSH) levels, and expression of genes involved in lipid metabolism and endoplasmic reticulum (ER) stress. Analysis of two previous transcriptomic datasets was carried out.
    Results: Busulfan induced lipid accumulation in HepaRG cells but not in six different batches of PHH. In HepaRG cells, busulfan impaired VLDL secretion, increased fatty acid uptake, and induced ER stress. Transcriptomic data analysis and decreased GSH levels suggested that busulfan-induced steatosis might be linked to the high expression of glutathione S-transferase (GST) isoenzyme A1, which is responsible for the formation of the hepatotoxic sulfonium cation conjugate. In keeping with this, the GST inhibitor ethacrynic acid and the chemical chaperone tauroursodeoxycholic acid alleviated busulfan-induced lipid accumulation in HepaRG cells supporting the role of the sulfonium cation conjugate and ER stress in steatosis.
    Conclusion: While the HepaRG cell line is an invaluable tool for pharmacotoxicological studies, it might not be always an appropriate model to predict and mechanistically investigate drug-induced liver injury. Hence, we recommend carrying out toxicological investigations in both HepaRG cells and PHH to avoid drawing wrong conclusions on the potential hepatotoxicity of drugs and other xenobiotics.
    MeSH term(s) Humans ; Busulfan/toxicity ; Busulfan/metabolism ; Hepatocytes/metabolism ; Fatty Liver/chemically induced ; Fatty Liver/metabolism ; Chemical and Drug Induced Liver Injury/etiology ; Drug-Related Side Effects and Adverse Reactions ; Cations/metabolism ; Lipids/adverse effects ; Liver/metabolism
    Chemical Substances Busulfan (G1LN9045DK) ; Cations ; Lipids
    Language English
    Publishing date 2023-09-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 639134-5
    ISSN 1472-8206 ; 0767-3981
    ISSN (online) 1472-8206
    ISSN 0767-3981
    DOI 10.1111/fcp.12951
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