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Published in: Digestive Diseases and Sciences 12/2017

01-12-2017 | Original Article

Enteric Glial Dysfunction Evoked by Apolipoprotein E Deficiency Contributes to Delayed Gastric Emptying

Authors: Seiichiro Fukuhara, Tatsuhiro Masaoka, Soraya Nishimura, Masaya Nakamura, Juntaro Matsuzaki, Hitoshi Tsugawa, Sawako Miyoshi, Hideki Mori, Satoshi Kawase, Shinsuke Shibata, Hideyuki Okano, Takanori Kanai, Hidekazu Suzuki

Published in: Digestive Diseases and Sciences | Issue 12/2017

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Abstract

Background and Aim

Diabetes is the main cause of gastroparesis accompanying decreased neuronal nitric oxide synthase (nNOS) in myenteric ganglia of the stomach. Decreased nNOS expression in the stomach also results from defects in apolipoprotein E (ApoE), which is secreted by astrocytes and has neuroprotective effects on the central nervous system. However, the roles of ApoE and enteric glial cells on gastric motility are uncertain. In this study, ApoE and enteric glial cell alterations in gastroparesis were investigated.

Methods

Type 2 diabetic (db/db) mice and ApoE-knockout mice were analyzed. Gastric emptying was measured using the 13C acetic acid breath test. Expression levels of the pan-neuronal marker, protein gene product 9.5 (PGP 9.5), and glial marker, glial fibrillary acidic protein (GFAP) were examined by immunohistochemistry. Neural stem cells (NSCs) were injected into the gastric antral wall of ApoE-knockout mice.

Results

Delayed gastric emptying was observed in 27% of db/db mice with significant decreases in serum ApoE levels and GFAP expression in the gastric antrum. Gastric emptying was also delayed in ApoE-knockout mice, with a significant decrease in GFAP expression, but no change in PGP 9.5 expression. Transplantation of NSCs improved gastric emptying in ApoE-knockout mice through supplementation of GFAP-positive cells.

Conclusions

Our results suggest that decreased enteric glial cells in ApoE-knockout mice are crucial for development of delayed gastric emptying, and NSC transplantation is effective in restoring myenteric ganglia and gastric motility.
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Metadata
Title
Enteric Glial Dysfunction Evoked by Apolipoprotein E Deficiency Contributes to Delayed Gastric Emptying
Authors
Seiichiro Fukuhara
Tatsuhiro Masaoka
Soraya Nishimura
Masaya Nakamura
Juntaro Matsuzaki
Hitoshi Tsugawa
Sawako Miyoshi
Hideki Mori
Satoshi Kawase
Shinsuke Shibata
Hideyuki Okano
Takanori Kanai
Hidekazu Suzuki
Publication date
01-12-2017
Publisher
Springer US
Published in
Digestive Diseases and Sciences / Issue 12/2017
Print ISSN: 0163-2116
Electronic ISSN: 1573-2568
DOI
https://doi.org/10.1007/s10620-017-4820-7

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