Effects of lactadherin on plasma D-lactic acid and small intestinal MUC2 and claudin-1 expression levels in rats with rotavirus-induced diarrhea

Xu,Rui; Lei,Yi‑Hui; Shi,Jun; Zhou,Yi‑Jun; Chen,Ying‑Wei; He,Zhen‑Juan

doi:10.3892/etm.2016.3015

Effects of lactadherin on plasma D-lactic acid and small intestinal MUC2 and claudin-1 expression levels in rats with rotavirus-induced diarrhea

Authors:
- Rui Xu
- Yi‑Hui Lei
- Jun Shi
- Yi‑Jun Zhou
- Ying‑Wei Chen
- Zhen‑Juan He
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Affiliations: Department of Neonatology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China, Department of Perinatal Research Laboratory, Shanghai Institute for Pediatric Research Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China
Published online on: January 22, 2016 https://doi.org/10.3892/etm.2016.3015
Pages: 943-950

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Abstract

The aim of the present study was to investigate the effects of lactadherin on plasma D‑lactic acid and small intestinal mucin (MUC) 2 and claudin‑1 expression levels in rats with diarrhea induced by rotavirus (RV) infection. A total of 75 seven‑day‑old healthy Sprague‑Dawley rats were randomly divided into the following five groups: Control (C), RV infection (RVI), lactadherin before rotavirus infection (LBRI), lactadherin after rotavirus infection (LARI), and blank (B). On day 4 of artificial feeding, the rats in groups RVI, LBRI and LARI were intragastric administered 1x106 PFU RV; whereas the rats in groups C and B were intragastrically administered an equal volume of maintenance solution from the RV supernatant and normal saline, respectively. In the LBRI and LARI groups, rats received daily intragastric administration of 0.25 mg lactadherin for three days prior to and following infection with RV, respectively. The course of diarrheal symptoms was observed in each group and samples were collected on days 1, 4, and 7 post‑infection in order to determine the mucosal morphology, plasma D‑lactic acid levels and the expression levels of MUC2 and the intracellular junction protein, claudin-1, in the small intestine. On day 4 post‑infection, the rats in group RVI demonstrated severely damaged small intestines and typical diarrheal characteristics, as detected by light microscopy; whereas rats in groups LBRI and LARI demonstrated intact small intestinal villi with partial vacuolation of epithelial cells and changes in the position of their nuclei. Electron microscopy demonstrated that the rats in the RVI group had sparse, shortened, disordered intestinal microvilli and widened intercellular junctions; whereas those in groups LBRI and LARI had long intestinal microvilli sparser compared with groups B and C and slightly widened intercellular junctions. Plasma D‑lactic acid levels were increased in groups RVI, LBRI and LARI, as compared with groups B and C, and the greatest levels were detected in the RVI group on days 1, 4 and 7 post‑infection. In addition to maintaining intestinal permeability, lactadherin enhanced the expression levels of MUC2 and reduced the expression of claudin‑1; therefore, further protecting the intestinal epithelial barrier, which may contribute to the prevention and treatment of diarrhea induced by infection with RV.

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