Alterations of nitric oxide homeostasis as trigger of intestinal barrier dysfunction in non-alcoholic fatty liver disease

Autor(en)
Anja Baumann, Dragana Rajcic, Annette Brandt, Victor Manuel Sanchez Juarez, Finn Jung, Raphaela Staltner, Anika Nier, Michael Trauner, Katharina Staufer, Ina Bergheim
Abstrakt

Changes in intestinal nitric oxide metabolism are discussed to contribute for the development of intestinal barrier dysfunction in non-alcoholic fatty liver disease (NAFLD). To induce steatosis, female C57BL/6J mice were pair-fed with a liquid control diet (C) or a fat-, fructose- and cholesterol-rich diet (FFC) for 8 weeks. Mice received the diets ± 2.49 g L-arginine/kg bw/day for additional 5 weeks. Furthermore, mice fed C or FFC ± L-arginine/kg bw/day for 8 weeks were concomitantly treated with the arginase inhibitor Nω-hydroxy-nor-L-arginine (nor-NOHA, 0.01 g/kg bw). Liver damage, intestinal barrier function, nitric oxide levels and arginase activity in small intestine were assessed. Also, arginase activity was measured in serum from 13 patients with steatosis (NAFL) and 14 controls. The development of steatosis with beginning inflammation was associated with impaired intestinal barrier function, increased nitric oxide levels and a loss of arginase activity in small intestine in mice. L-arginine supplementation abolished the latter along with an improvement of intestinal barrier dysfunction; nor-NOHA attenuated these effects. In patients with NAFL, arginase activity in serum was significantly lower than in healthy controls. Our data suggest that increased formation of nitric oxide and a loss of intestinal arginase activity is critical in NAFLD-associated intestinal barrier dysfunction.

Organisation(en)
Department für Ernährungswissenschaften
Externe Organisation(en)
Medizinische Universität Wien
Journal
Journal of Cellular and Molecular Medicine
Band
26
Seiten
1206-1218
Anzahl der Seiten
13
ISSN
1582-1838
DOI
https://doi.org/10.1111/jcmm.17175
Publikationsdatum
02-2022
Peer-reviewed
Ja
ÖFOS 2012
303009 Ernährungswissenschaften
Schlagwörter
ASJC Scopus Sachgebiete
Molecular Medicine, Cell Biology
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/alterations-of-nitric-oxide-homeostasis-as-trigger-of-intestinal-barrier-dysfunction-in-nonalcoholic-fatty-liver-disease(9b0398ec-c6c8-41b1-8de7-cfa12edc7e58).html