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Arylhydrocarbon receptor-dependent mIndy (Slc13a5) induction as possible contributor to benzo[a]pyrene-induced lipid accumulation in hepatocytes

Titelangaben

Neuschäfer-Rube, Frank ; Schraplau, Anne ; Schewe, Bettina ; Lieske, Stefanie ; Krützfeldt, Julia-Mignon ; Ringel, Sebastian ; Henkel, Janin ; Birkenfeld, Andreas L. ; Püschel, Gerhard P.:
Arylhydrocarbon receptor-dependent mIndy (Slc13a5) induction as possible contributor to benzo[a]pyrene-induced lipid accumulation in hepatocytes.
In: Toxicology. Bd. 337 (2015) . - S. 1-9.
ISSN 1879-3185
DOI: https://doi.org/10.1016/j.tox.2015.08.007

Abstract

Non-alcoholic fatty liver disease is a growing problem in industrialized and developing countries. Hepatic lipid accumulation is the result of an imbalance between fatty acid uptake, fatty acid de novo synthesis, β-oxidation and secretion of triglyceride-rich lipoproteins from the hepatocyte. A central regulator of hepatic lipid metabolism is cytosolic citrate that can either be derived from the mitochondrium or be taken up from the blood via the plasma membrane sodium citrate transporter NaCT, the product of the mammalian INDY gene (SLC13A5). mINDY ablation protects against diet-induced steatosis whereas mINDY expression is increased in patients with hepatic steatosis. Diet-induced hepatic steatosis is also enhanced by activation of the arylhyrocarbon receptor (AhR) both in humans and animal models. Therefore, the hypothesis was tested whether the mINDY gene might be a target of the AhR. In accordance with such a hypothesis, the AhR activator benzo[a]pyrene induced the mINDY expression in primary cultures of rat hepatocytes in an AhR-dependent manner. This induction resulted in an increased citrate uptake and citrate incorporation into lipids which probably was further enhanced by the benzo[a]pyrene-dependent induction of key enzymes of fatty acid synthesis. A potential AhR binding site was identified in the mINDY promoter that appears to be conserved in the human promoter. Elimination or mutation of this site largely abolished the activation of the mINDY promoter by benzo[a]pyrene. This study thus identified the mINDY as an AhR target gene. AhR-dependent induction of the mINDY gene might contribute to the development of hepatic steatosis.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: NAFLD; Non-alcoholic fatty liver disease; SLC13A5
Institutionen der Universität: Fakultäten > Fakultät für Lebenswissenschaften: Lebensmittel, Ernährung und Gesundheit
Fakultäten
Fakultäten > Fakultät für Lebenswissenschaften: Lebensmittel, Ernährung und Gesundheit > Lehrstuhl Biochemie der Ernährung > Lehrstuhl Biochemie der Ernährung - Univ.-Prof. Dr. Janin Henkel-Oberländer
Fakultäten > Fakultät für Lebenswissenschaften: Lebensmittel, Ernährung und Gesundheit > Lehrstuhl Biochemie der Ernährung
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie
Eingestellt am: 26 Apr 2021 11:58
Letzte Änderung: 19 Okt 2022 12:54
URI: https://eref.uni-bayreuth.de/id/eprint/64436