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PLoS One. 2018 Apr 23;13(4):e0194867. doi: 10.1371/journal.pone.0194867. eCollection 2018.

Chronic calcitriol supplementation improves the inflammatory profiles of circulating monocytes and the associated intestinal/adipose tissue alteration in a diet-induced steatohepatitis rat model.

Su YB1,2, Li TH2,3,4,5, Huang CC1,2,4, Tsai HC1,2, Huang SF2,6, Hsieh YC2,7, Yang YY1,2,4,7,8, Huang YH2,7, Hou MC2,7, Lin HC2,7.

Author information

1
Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.
2
Department of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan.
3
Division of Allergy and Immunology, Taipei Veterans General Hospital, Taipei, Taiwan.
4
Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan.
5
Chia-Yi Branch of Taichung Veterans General Hospital, Chiayi, Taiwan.
6
Division of Infection, Taipei Veterans General Hospital, Taipei, Taiwan.
7
Division of Gastroenterology and Hepatology, Taipei Veterans General Hospital, Taipei, Taiwan.
8
Division of General Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.

Abstract

Vitamin D deficiency and up-regulated TNFα-related signals are reported to be involved in abnormalities including intestinal hyper-permeability, bacterial translocation, systemic/portal endotoxemia, intestinal/adipose tissue/hepatic inflammation, and hepatic steatosis in nonalcoholic steatohepatitis (NASH). This study aims to explore the molecular mechanisms and effects of chronic calcitriol [1,25-(OH)2D3, hormonal form of vitamin D] on gut-adipose tissue-liver axis abnormalities using a high-fat diet (HFD)-fed rat model of NASH. In HFD-fed obese rats on a 10-week calcitriol (0.3 μg/kg/TIW) or vehicle treatment (NASH-vit. D and NASH-V rats) reigme, various in vivo and in vitro experiments were undertaken. Through anti-TNFα-TNFR1-NFκB signaling effects, chronic calcitriol treatment significantly restored plasma calcitriol levels and significantly improved vitamin D receptor (VDR) expression in monocytes and the small intestine of NASH-vit. D rats. Significantly, plasma and portal endotoxin/TNFα levels, bacterial translocation to mesenteric lymph nodes, plasma DX-4000-FITC, fecal albumin-assessed intestinal hyper-permeability, over-expression of TNFα-related immune profiles in monocytes, inflammation of intestinal/mesenteric adipose tissue (MAT)/liver and hepatic steatosis were improved by chronic calcitriol treatment of NASH rats. Additionally, in vitro experiments with acute calcitriol co-incubation reversed NASH-V rat monocyte supernatant/TNFα-induced monolayer barrier dysfunction in caco-2 cells, cytokine release from MAT-derived adipocytes, and triglyceride synthesis by lean-V rat hepatocytes. Using in vivo and in vitro experiments, our study reported calcitriol signaling in the gut as well as in adipose tissue. Meanwhile, our study suggests that restoration of systemic and intestinal vitamin D deficiency using by chronic vitamin D treatment effectively reduces TNFα-mediated immunological abnormalities associated with the gut-adipose tissue-liver axis and hepatic steatosis in NASH rats.

PMID:
29684027
PMCID:
PMC5912737
DOI:
10.1371/journal.pone.0194867
[Indexed for MEDLINE]
Free PMC Article

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