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01-12-2012 | Original Article

Neuroprotective Effect of Quercetin on the Duodenum Enteric Nervous System of Streptozotocin-Induced Diabetic Rats

Authors: Cláudia Regina Pinheiro Lopes, Paulo Emílio Botura Ferreira, Jacqueline Nelisis Zanoni, Angela Maria Pereira Alves, Éder Paulo Belato Alves, Nilza Cristina Buttow

Published in: Digestive Diseases and Sciences | Issue 12/2012

Abstract

Background

In diabetes mellitus (DM), hyperglycemia promotes changes in biochemical mechanisms that induce oxidative stress. Oxidative stress has been closely linked to adverse consequences that affect the function of the gastrointestinal tract caused by injuries to the enteric nervous system (ENS) that in turn cause neurodegeneration and enteric glial loss. Therapeutic approaches have shown that diet supplementation with antioxidants, such as quercetin, reduce oxidative stress.

Aims

This work sought to evaluate neurons and enteric glial cells in the myenteric and submucosal plexuses of the duodenum in diabetic rats supplemented with quercetin.

Methods

The duodenum of 24 rats, including a control group (C), control quercetin supplementation group (CQ), diabetic group (D), and diabetic quercetin supplementation group (DQ), were used to investigate whole mounts of muscular and submucosal layers subjected to immunohistochemistry to detect vasoactive intestinal peptide in the myenteric layer and double-staining for HuC-D/neuronal nitric oxide synthase (nNOS) and HuC-D/S100.

Results

A reduction of the general neuronal population (HuC/D) was found in the myenteric and submucosal plexuses (p < 0.001) in the D and DQ groups. The nitrergic subpopulation (nNOS) decreased only in the myenteric plexus (p < 0.001), and glial cells decreased in both plexuses (p < 0.001) in the D and DQ groups. In diabetic rats, quercetin supplementation reduced neuronal and glial loss. Diabetes promoted an increase in the cell body area of both the general and nitrergic populations. Quercetin supplementation only prevented neuronal hypertrophy in the general population.

Conclusion

Supplementation with quercetin eased the damage caused by diabetes, promoting a neuroprotective effect and reducing enteric glial loss in the duodenum.

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Title: Neuroprotective Effect of Quercetin on the Duodenum Enteric Nervous System of Streptozotocin-Induced Diabetic Rats
Authors: Cláudia Regina Pinheiro Lopes
Paulo Emílio Botura Ferreira
Jacqueline Nelisis Zanoni
Angela Maria Pereira Alves
Éder Paulo Belato Alves
Nilza Cristina Buttow
Publication date: 01-12-2012
Publisher: Springer US
Published in: Digestive Diseases and Sciences / Issue 12/2012
Print ISSN: 0163-2116
Electronic ISSN: 1573-2568
DOI: https://doi.org/10.1007/s10620-012-2300-7

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