Colonic dysmotility associated with high-fat diet-induced obesity: Role of enteric glia.
colonic motor dysfunction
enteric glia
inflammation
obesity
substance P
Journal
FASEB journal : official publication of the Federation of American Societies for Experimental Biology
ISSN: 1530-6860
Titre abrégé: FASEB J
Pays: United States
ID NLM: 8804484
Informations de publication
Date de publication:
04 2020
04 2020
Historique:
received:
31
07
2019
revised:
30
01
2020
accepted:
13
02
2020
pubmed:
23
2
2020
medline:
20
1
2021
entrez:
23
2
2020
Statut:
ppublish
Résumé
The present study was designed to examine the role of enteric glial cells (EGCs) in colonic neuromuscular dysfunctions in a mouse model of high-fat diet (HFD)-induced obesity. C57BL/6J mice were fed with HFD or standard diet (SD) for 1, 2, or 8 weeks. Colonic interleukin (IL)-1β, IL-6, and malondialdehyde (MDA) levels were measured. Expression of occludin in colonic tissues was examined by western blot. Substance P (SP), S100β, GFAP, and phosphorylated mitogen-activated protein kinase 1 (pERK) were assessed in whole mount specimens of colonic plexus by immunohistochemistry. Colonic tachykininergic contractions, elicited by electrical stimulation or exogenous SP, were recorded in the presence or absence of fluorocitrate (FC). To mimic exposure to HFD, cultured EGCs were incubated with palmitate (PA) and/or lipopolysaccharide (LPS). SP and IL-1β levels were assayed in the culture medium by ELISA. HFD mice displayed an increase in colonic IL-1β and MDA, and a reduction of occludin at week 2. These changes occurred to a greater extent at week 8. In vitro electrically evoked tachykininergic contractions were enhanced in HFD mice after 2 or 8 weeks, and they were blunted by FC. Colonic IL-6 levels as well as substance P and S100β density in myenteric ganglia of HFD mice were increased at week 8, but not at week 1 or 2. In cultured EGCs, co-incubation with palmitate plus LPS led to a significant increase in both SP and IL-1β release. HFD-induced obesity is characterized by a hyperactivation of EGCs and is involved in the development of enteric motor disorders through an increase in tachykininergic activity and release of pro-inflammatory mediators.
Identifiants
pubmed: 32086846
doi: 10.1096/fj.201901844R
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
5512-5524Informations de copyright
© 2020 Federation of American Societies for Experimental Biology.
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