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Vitamin A influences the incretin hormone profiles by activating the retinoic acid receptor β.

Journal of diabetes and its complications
August 1, 2024
Baowen Yu et al. (10 authors)
Journal ArticleAnimal StudyMolecular Study
Study Details

Study Goal

The researchers aimed to investigate the impact of Vitamin A on intestinal glucose metabolic phenotypes, particularly its role in glucose-stimulated insulin secretion and GLP-1 expression.

Results Summary

Vitamin A deficiency (VAD) led to reduced glucose-stimulated insulin secretion and loss of intestinal GLP-1 expression, which were restored upon reintroducing Vitamin A. Activation of retinoic acid receptor β (RARβ) in STC-1 cells restored incretin hormone synthesis and secretory function.

Population

Male C57BL/6 mice

Effective Dosage

30 IU/g/d retinol for 10 days

Duration

12 weeks (VAD/VAN diet) + 10 days (retinol intervention) + 10 weeks (VAN diet)

Interactions

None mentioned

Extracted Claims (10)
InterventionDirectionEndpointPopulationDosageImpactClaim #
VA-deficient diet (VAD)
decrease
glucose-stimulated insulin secretion
Male C57BL/6 mice
-
showed a decrease of
#1
VA-deficient diet (VAD)
decrease
intestinal glucagon-like peptide-1 (GLP-1) expression
Male C57BL/6 mice
-
a loss of
#2
reintroducing dietary VA to VAD mice
increase
intestinal VA levels
VAD mice
-
restored
#3
reintroducing dietary VA to VAD mice
increase
GLP-1 expression
VAD mice
-
restored
#4
reintroducing dietary VA to VAD mice
increase
normal glucose
VAD mice
-
restored
#5
incubation with retinol
increase
VA signaling factors expression
STC-1 cells
-
increased
#6
incubation with retinol
increase
retinoic acid receptor β (RARβ) expression
STC-1 cells
-
increased
#7
activation of RARβ
increase
intracellular incretin hormone synthesis
STC-1 cells
-
restored
#8
activation of RARβ
increase
secretory function
STC-1 cells
-
restored
#9
VA deficiency
decrease
intestinal glucose metabolic phenotypes
-
-
leads to an imbalance of
#10
Abstract

BACKGROUND: This study aimed to investigate the impact of Vitamin A (VA) on intestinal glucose metabolic phenotypes. METHODS: Male C57BL/6 mice were randomized assigned to a VA-normal diet (VAN) or a VA-deficient diet (VAD) for 12 weeks. After12 weeks, the VAD mice were given 30 IU/g/d retinol for 10 days and VAN diet (VADN) for 10 weeks. By using glucose tolerance tests, immunofluorescence staining, quantitative polymerase chain reaction, siRNA transduction, and enzyme-linked immunosorbent assay, the glucose metabolic phenotypes as well as secretory function and intracellular hormone changes of STC-1 were assessed. RESULTS: VAD mice showed a decrease of glucose-stimulated insulin secretion and a loss of intestinal glucagon-like peptide-1 (GLP-1) expression. Through reintroducing dietary VA to VAD mice, the intestinal VA levels, GLP-1 expression and normal glucose can be restored. The incubation with retinol increased VA signaling factors expression within STC-1 cells, especially retinoic acid receptor β (RARβ). The activation of RARβ restored intracellular incretin hormone synthesis and secretory function. CONCLUSIONS: VA deficiency leads to an imbalance of intestinal glucose metabolic phenotypes through a mechanism involving RARβ signaling pathway, suggesting a new method to achieve the treatment for VAD induced glucose metabolism impairment.

Medical Subject Headings (MeSH)
AnimalsMaleVitamin AMice, Inbred C57BLMiceReceptors, Retinoic AcidIncretinsGlucagon-Like Peptide 1Vitamin A DeficiencyIntestinal MucosaSignal TransductionInsulin Secretion
Study Links
Quality Scores
SafetyNot Assessed
Efficacy85/10
Quality75/10
Research Impact Scores
APT Score0.05
Weight Score1.17
Normalized Score0.69
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