Guo-Guang Ma1, Bin Shi2, Xue-Peng Zhang1, Yue Qiu1, Guo-Wei Tu1, Zhe Luo1,3. 1. Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China. 2. Department of Emergency Intensive Care Unit, Yangpu Hospital, Tongji University, Shanghai 200090, China. 3. Department of Critical Care Medicine, Xiamen Branch, Zhongshan Hospital, Fudan University, Xiamen 361015, China.
Abstract
BACKGROUND: The transcellular transport of muramyl dipeptide (MDP) mediated by peptide transporter (PepT1) involves the translocation into intestinal epithelial cell (IEC) stage and the transport out of IEC stage. However, its mechanism has not been fully understood. This study aimed to investigate the pathways and mechanisms of MDP transcellular transport in enterogenous infection. METHODS: Firstly, experimental rats were randomly divided into three groups: sham-operation (sham group), MDP perfusion (MDP group), and PepT1 competitive inhibition (MDP + Gly-Gly group). Then, the overall survival (OS) and intestinal weight were measured in MDP and MDP + Gly-Gly group. HE staining was performed to observe the pathological changes of the small intestine. The levels of IL-6, IL-1b, IL-8, IL-10, TNF-α, and nitric oxide (NO) in rat serum and small intestine were determined by ELISA. To further verify the pathways and mechanisms of MDP transcellular transport from IEC in intestinal inflammatory damage, the NFκB inhibitor, PDTC, was used to treated lamina propria macrophages in small intestinal mucosa in sham, MDP, and MDP + Gly-Gly groups. Finally, the expression of CD80/86 and the antigen presentation of dendritic cells (DCs) were measured by flow cytometry. RESULTS: MDP infusion was able to induce death, weight loss, and intestinal pathological injury in rats. Competitive binding of Gly-Gly to PepT1 effectively inhibited these effects induced by MDP. As well, competitive of PepT1 by Gly-Gly inhibited inflammation-related cytokines induced by MDP in rat serum and small intestine. Furthermore, we also found that MDP transported by PepT1 contributes to activation of macrophages and antigen presentation of DCs. CONCLUSIONS: PepT1-NFκB signal is pivotal for activation of intestinal inflammatory response and MDP transcellular transport. 2019 Annals of Translational Medicine. All rights reserved.
BACKGROUND: The transcellular transport of muramyl dipeptide (MDP) mediated by peptide transporter (PepT1) involves the translocation into intestinal epithelial cell (IEC) stage and the transport out of IEC stage. However, its mechanism has not been fully understood. This study aimed to investigate the pathways and mechanisms of MDP transcellular transport in enterogenous infection. METHODS: Firstly, experimental rats were randomly divided into three groups: sham-operation (sham group), MDP perfusion (MDP group), and PepT1 competitive inhibition (MDP + Gly-Gly group). Then, the overall survival (OS) and intestinal weight were measured in MDP and MDP + Gly-Gly group. HE staining was performed to observe the pathological changes of the small intestine. The levels of IL-6, IL-1b, IL-8, IL-10, TNF-α, and nitric oxide (NO) in rat serum and small intestine were determined by ELISA. To further verify the pathways and mechanisms of MDP transcellular transport from IEC in intestinal inflammatory damage, the NFκB inhibitor, PDTC, was used to treated lamina propria macrophages in small intestinal mucosa in sham, MDP, and MDP + Gly-Gly groups. Finally, the expression of CD80/86 and the antigen presentation of dendritic cells (DCs) were measured by flow cytometry. RESULTS: MDP infusion was able to induce death, weight loss, and intestinal pathological injury in rats. Competitive binding of Gly-Gly to PepT1 effectively inhibited these effects induced by MDP. As well, competitive of PepT1 by Gly-Gly inhibited inflammation-related cytokines induced by MDP in rat serum and small intestine. Furthermore, we also found that MDP transported by PepT1 contributes to activation of macrophages and antigen presentation of DCs. CONCLUSIONS: PepT1-NFκB signal is pivotal for activation of intestinal inflammatory response and MDP transcellular transport. 2019 Annals of Translational Medicine. All rights reserved.
Authors: M Buyse; F Berlioz; S Guilmeau; A Tsocas; T Voisin; G Péranzi; D Merlin; M Laburthe; M J Lewin; C Rozé; A Bado Journal: J Clin Invest Date: 2001-11 Impact factor: 14.808