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Resistant starch supplementation effects on plasma indole 3-acetic acid and aryl hydrocarbon receptor mRNA expression in hemodialysis patients: Randomized, double blind and controlled clinical trial

Authors :
Renata Azevedo
Marta Esgalhado
Julie Ann Kemp
Bruna Regis
Ludmila FMF Cardozo
Lia S. Nakao
Jessyca Sousa de Brito
Denise Mafra
Source :
Brazilian Journal of Nephrology
Publisher :
Sociedade Brasileira de Nefrologia.

Abstract

ABSTRACT Introduction: Gut microbiota imbalance is linked to high uremic toxins production such as indole-3-acetic acid (IAA) in chronic kidney disease patients. This toxin can activate the aryl hydrocarbon receptor (AhR), a ligand-activated transcription factor involved with inflammation. Strategies to restore gut microbiota balance can be associated with reduced production of IAA and its deleterious effects. This study aimed to evaluate prebiotic resistant starch (RS) supplementation effects on IAA plasma levels and AhR mRNA expression in CKD patients on hemodialysis (HD). Methods: This randomized, double-blind and placebo-controlled clinical trial evaluated forty-two stable HD patients allocated in RS (n=22) or placebo (n=20) groups. Patients received, alternately, cookies and sachets containing 16 g/day of RS (Hi-Maize 260®) or manioc flour for four weeks. Fasting pre-dialysis blood samples were collected and IAA plasma levels measured by high performance liquid chromatography. Peripheral blood mononuclear cells were isolated and processed for AhR and nuclear factor kappa B (NF-κB) mRNA expression analyzes by quantitative real-time PCR. Anthropometric and biochemical parameters, as well as food intake were also evaluated. Results: Thirty-one patients completed the study, 15 in the RS group and 16 in the placebo group. Although there was no significant alteration in IAA plasma levels, neither in AhR mRNA expression and NF-κB mRNA expression after RS supplementation, a positive correlation (r=0.48; p=0.03) was observed between IAA plasma levels and AhR expression at baseline. Conclusion: Even though prebiotic RS supplementation did not influence IAA levels or AhR expression, their positive association reinforces a possible interaction between them.

Details

Language :
English, Portuguese
ISSN :
01012800 and 21758239
Database :
Directory of Open Access Journals
Journal :
Brazilian Journal of Nephrology
Publication Type :
Academic Journal
Accession number :
edsdoj.06faa0f1f3484182b84f2c89284d49ec
Document Type :
article
Full Text :
https://doi.org/10.1590/2175-8239-jbn-2020-0003