Abstract |
Alginate oligosaccharide (AOS) is a non-toxic, non-immunogenic, non-carcinogenic and biodegradable product generated by depolymerisation of alginate, and exhibits various salutary properties. The present study was designed to evaluate whether AOS supplementation could attenuate enterotoxigenic Escherichia coli (ETEC)-induced intestinal mucosal injury in weaned pigs. Twenty-four weaned pigs were randomly assigned to three treatments: (1) non-challenged control; (2) ETEC-challenged control; and (3) ETEC challenge + AOS treatment (100 mg kg-1). On day 12, pigs in the non-challenged group were orally infused with sterilised Luria-Bertani culture while pigs in other groups were orally infused with ETEC (2.6 × 1011 colony-forming units). At 3 days after the challenge, all pigs were orally administered d-xylose at 0.1 g per kg body weight and then euthanised 1 h later to obtain serum and intestinal mucosa samples. Our results showed that ETEC infection both reduced (P < 0.05) the villus height and proportion of epithelial cells in the S phase and elevated (P < 0.05) the percentage of total apoptotic epithelial cells in the jejunum and ileum; these deleterious effects caused by ETEC were alleviated (P < 0.05) by supplemental AOS. Meanwhile, AOS ingestion attenuated (P < 0.05) not only the up-regulated tumour necrosis factor receptor 1 ( TNFR1), cysteinyl aspartate-specific protease-3 (caspase-3), -8 and -9 transcriptions, as well as the enhanced caspase activities (caspase-3, -8 and -9), but also the down-regulated cyclin E1 and cyclin-dependent kinase 2 (CDK2) transcriptions in jejunal and ileal mucosae, caused by the ETEC challenge. In conclusion, it is possible that the protective effects of AOS against ETEC-induced intestinal mucosal disruption in weaned pigs are associated with the restrained enterocyte death, by reducing both mitochondria-dependent and TNFR1-dependent apoptosis and the accelerated enterocyte proliferation, via enhancing the cyclin E-CDK2 complex formation.
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Authors | Jin Wan , Jiao Zhang , Daiwen Chen , Bing Yu , Xiangbing Mao , Ping Zheng , Jie Yu , Zhiqing Huang , Junqiu Luo , Yuheng Luo , Jun He |
Journal | Food & function
(Food Funct)
Vol. 9
Issue 12
Pg. 6401-6413
(Dec 13 2018)
ISSN: 2042-650X [Electronic] England |
PMID | 30457630
(Publication Type: Journal Article)
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Chemical References |
- Alginates
- Cyclin E
- Oligosaccharides
- Cyclin-Dependent Kinase 2
- Caspases
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Topics |
- Alginates
(administration & dosage, chemistry)
- Animals
- Caspases
(genetics, metabolism)
- Cyclin E
(genetics, metabolism)
- Cyclin-Dependent Kinase 2
(genetics, metabolism)
- Enterotoxigenic Escherichia coli
(physiology)
- Escherichia coli Infections
(drug therapy, genetics, metabolism, microbiology)
- Female
- Intestinal Mucosa
(drug effects, metabolism, microbiology)
- Male
- Oligosaccharides
(administration & dosage)
- Swine
- Weaning
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