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://ucris.univie.ac.at/portal/de/publications/alterations-of-nitric-oxide-homeostasis-as-trigger-of-intestinal-barrier-dysfunction-in-nonalcoholic-fatty-liver-disease(9b0398ec-c6c8-41b1-8de7-cfa12edc7e58).html