P2X7 Receptor Antagonist Recovers Ileum Myenteric Neurons After Experimental Ulcerative Colitis

Overview

Journal World J Gastrointest Pathophysiol

Publisher Baishideng Publishing Group

Specialty Gastroenterology

Date 2020 Jun 27

PMID 32587788

Citations 7

Authors

Roberta Figueiroa Souza

Maria Munhoz Evangelinellis

Cristina Eusebio Mendes

Marta Righetti

Mucio Cevulla Silva Lourenco

Patricia Castelucci

Affiliations

Soon will be listed here.

Abstract

Background: The P2X7 receptor is expressed by enteric neurons and enteric glial cells. Studies have demonstrated that administration of a P2X7 receptor antagonist, brilliant blue G (BBG), prevents neuronal loss.

Aim: To report the effects of BBG in ileum enteric neurons immunoreactive (ir) following experimental ulcerative colitis in .

Methods: 2,4,6-trinitrobenzene sulfonic acid (TNBS group, = 5) was injected into the distal colon. BBG (50 mg/kg, BBG group, = 5) or vehicle (sham group, = 5) was given subcutaneously 1 h after TNBS. The animals were euthanized after 24 h, and the ileum was removed. Immunohistochemistry was performed on the myenteric plexus to evaluate immunoreactivity for P2X7 receptor, neuronal nitric oxide synthase (nNOS), choline acetyltransferase (ChAT), HuC/D and glial fibrillary acidic protein.

Results: The numbers of nNOS-, ChAT-, HuC/D-ir neurons and glial fibrillary acidic protein-ir glial cells were decreased in the TNBS group and recovered in the BBG group. The neuronal profile area (μm) demonstrated that nNOS-ir neurons decreased in the TNBS group and recovered in the BBG group. There were no differences in the profile areas of ChAT- and HuC/D-ir neurons.

Conclusion: Our data conclude that ileum myenteric neurons and glial cells were affected by ulcerative colitis and that treatment with BBG had a neuroprotective effect. Thus, these results demonstrate that the P2X7 receptor may be an important target in therapeutic strategies.

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