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Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Protective effects of pre-treatment with exogenous porcine glucagon-like peptide-2 and its microspheres of piglets with lipopolysaccharide-induced intestinal inflammation

Jie Wu A , Keke Qi A and Ziwei Xu https://orcid.org/0000-0003-3945-7000 A *
+ Author Affiliations
- Author Affiliations

A Institute of Animal Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China.

* Correspondence to: zjsnkyxzw@163.com

Handling Editor: Sathya Velmurugan

Animal Production Science 63(1) 51-58 https://doi.org/10.1071/AN22218
Submitted: 6 June 2022  Accepted: 25 August 2022   Published: 23 September 2022

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Glucagon-like peptide-2 (GLP-2) is an intestinotrophic growth hormone that can accelerate intestinal development and recovery from injury. However, the half-life of GLP-2 is short, thus it must be administered frequently. Moreover, its effects during weaning are unclear.

Aims: We tested the effects of porcine GLP-2 (pGLP-2) and pGLP-2 microspheres on lipopolysaccharide (LPS)-induced intestinal inflammation in weaning piglets.

Methods: Eighteen female weaning piglets aged 21 days (5.38 ± 0.72 kg initial bodyweight) were randomly assigned to three treatment groups: (1) control, (2) GLP-2, and (3) GLP-2 microsphere (MS) group. Control piglets were injected intraperitoneally with 3 mL of saline solution from Days 1 to 7, GLP-2 piglets were injected intraperitoneally with 100 μg pGLP-2/kg bodyweight from Days 1 to 7, and MS piglets were injected intraperitoneally with 200 mg GLP-2 microspheres on Day 1 and with 3 mL saline solution from Days 2 to 7. On Day 8, all piglets were injected with 100 μg LPS/kg bodyweight.

Key results: Piglets in the GLP-2 and MS groups showed markedly increased average daily weight gain on Day 7, decreased serum myeloperoxidase, LPS and keratinocyte growth factor levels, and increased serum interleukin-10 levels compared with the control group. In addition, the GLP-2 group showed decreased myeloperoxidase content in the duodenum and ileum, and reduced caspase-3 activity in the duodenum and jejunum, whereas MS piglets showed decreased myeloperoxidase levels and suppressed caspase-3 activity in the duodenum and jejunum. Moreover, administration of pGLP-2 or pGLP-2 microspheres resulted in decreased interleukin-8 and interferon-γ mRNA expression levels in the jejunum, as compared with the control group.

Conclusions: Our results indicated that pGLP-2 promotes growth, and ameliorates LPS-induced serum and intestinal inflammatory responses in piglets. Furthermore, pGLP-2 microspheres can achieve similar therapeutic effects as pGLP-2 under the premise of fewer injections.

Implications: pGLP-2 microspheres have considerable potential for the treatment of weaning-induced intestinal inflammation in piglets.

Keywords: body weight, intestinal inflammation, lipopolysaccharide, microspheres, mRNA expression, piglets, porcine glucagon-like peptide-2, serum.


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