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Toxicol Appl Pharmacol. 2017 Oct 1;332:138-148. doi: 10.1016/j.taap.2017.04.009. Epub 2017 Apr 12.

Genistein prevention of hyperglycemia and improvement of glucose tolerance in adult non-obese diabetic mice are associated with alterations of gut microbiome and immune homeostasis.

Author information

1
Department of Environmental Health Sciences, College of Public Health, United States.
2
Department of Veterinary Biosciences and Diagnostic Imaging, College of Veterinary Medicine, United States.
3
Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, United States.
4
Department of Veterinary Biosciences and Diagnostic Imaging, College of Veterinary Medicine, United States. Electronic address: tlguo1@uga.edu.

Abstract

Although studies have linked soy phytoestrogen 4,7,4-trihydroxyisoflavone genistein (GEN) to reduced type 1 diabetes (T1D) risk, the mechanism of dietary GEN on T1D remains unknown. In our studies, adult non-obese diabetic (NOD) mouse model was employed to investigate the effects of GEN exposure on blood glucose level (BGL), glucose tolerance, gut microbiome, and immune responses. Adult male and female NOD mice were fed with either soy-based or casein-based diet, and received GEN at 20mg/kg body weight by gavage daily. The BGL and immune responses (represented by serum antibodies, cytokines and chemokines, and histopathology) were monitored, while the fecal gut microbiome was sequenced for 16S ribosomal RNA to reveal any alterations in gut microbial communities. A significantly reduced BGL was found in NOD males fed with soy-based diet on day 98 after initial dosing, and an improved glucose tolerance was observed on both diets. In addition, an anti-inflammatory response (suggested by reduced IgG2b and cytokine/chemokine levels, and alterations in the microbial taxonomy) was accompanied by an altered β-diversity in gut microbial species. Among the NOD females exposed to GEN, a later onset of T1D was observed. However, the profiles of gut microbiome, antibodies and cytokines/chemokines were all indicative of pro-inflammation. This study demonstrated an association among GEN exposure, gut microbiome alteration, and immune homeostasis in NOD males. Although the mechanisms underlying the protective effects of GEN in NOD mice need to be explored further, the current study suggested a GEN-induced sex-specific effect in inflammatory status and gut microbiome.

KEYWORDS:

Genistein; Glucose tolerance; Gut microbiome; Hyperglycemia; Inflammation; NOD mouse; Type 1 diabetes

PMID:
28412308
PMCID:
PMC5592136
DOI:
10.1016/j.taap.2017.04.009
[Indexed for MEDLINE]
Free PMC Article

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