Role of Glutamine in the Mediation of E-cadherin, P120-catenin and Inflammation in Ventilator-induced Lung Injury

Overview

Journal Chin Med J (Engl)

Specialty General Medicine

Date 2018 Mar 27

PMID 29578124

Citations 2

Authors

Jian-Lei Qiu

Bai-Ling Song

Yu-Juan Wang

Fu-Tao Zhang

Yue-Lan Wang

Affiliations

Soon will be listed here.

Abstract

Background: Ventilator-induced lung injury (VILI) is commonly associated with barrier dysfunction and inflammation reaction. Glutamine could ameliorate VILI, but its role has not been fully elucidated. This study examined the relationship between inflammatory cytokines (interleukin [IL]-6, tumor necrosis factor [TNF]-α, and IL-10) and adherens junctions (E-cadherin, p120-catenin), which were ameliorated by glutamine in VILI, both in vitro and in vivo.

Methods: For the in vivo study, 30 healthy C57BL/6 mice weighing 25-30 g were randomly divided into five groups with random number table (n = 6 in each group): control (Group C); low tidal volume (Group L); low tidal volume + glutamine (Group L + G); high tidal volume (Group H); and high tidal volume + glutamine (Group H + G). Mice in all groups, except Group C, underwent mechanical ventilation for 4 h. For the in vitro study, mouse lung epithelial 12 (MLE-12) cells pretreated with glutamine underwent cyclic stretching at 20% for 4 h. Cell lysate and lung tissue were obtained to detect the junction proteins, inflammatory cytokines, and lung pathological changes by the Western blotting, cytokine assay, hematoxylin and eosin staining, and immunofluorescence.

Results: In vivo, compared with Group C, total cell counts (t = -28.182, P < 0.01), the percentage of neutrophils (t = -28.095, P < 0.01), IL-6 (t = -28.296, P < 0.01), and TNF-α (t = -19.812, P < 0.01) in bronchoalveolar lavage (BAL) fluid, lung injury scores (t = -6.708, P < 0.01), and the wet-to-dry ratio (t = -15.595, P < 0.01) were increased in Group H; IL-10 in BAL fluid (t = 9.093, P < 0.01) and the expression of E-cadherin (t = 10.044, P < 0.01) and p120-catenin (t = 13.218, P < 0.01) were decreased in Group H. Compared with Group H, total cell counts (t = 14.844, P < 0.01), the percentage of neutrophils (t = 18.077, P < 0.01), IL-6 (t = 18.007, P < 0.01), and TNF-α (t = 10.171, P < 0.01) in BAL fluid were decreased in Group H + G; IL-10 in BAL fluid (t = -7.531, P < 0.01) and the expression of E-cadherin (t = -14.814, P < 0.01) and p120-catenin (t = -9.114, P < 0.01) were increased in Group H + G. In vitro, compared with the nonstretching group, the levels of IL-6 (t = -21.111, P < 0.01) and TNF-α (t = -15.270, P < 0.01) were increased in the 20% cyclic stretching group; the levels of IL-10 (t = 5.450, P < 0.01) and the expression of E-cadherin (t = 17.736, P < 0.01) and p120-catenin (t = 16.136, P < 0.01) were decreased in the 20% cyclic stretching group. Compared with the stretching group, the levels of IL-6 (t = 11.818, P < 0.01) and TNF-α (t = 8.631, P < 0.01) decreased in the glutamine group; the levels of IL-10 (t = -3.203, P < 0.05) and the expression of E-cadherin (t = -13.567, P < 0.01) and p120-catenin (t = -10.013, P < 0.01) were increased in the glutamine group.

Conclusions: High tidal volume mechanical ventilation and 20% cyclic stretching could cause VILI. Glutamine regulates VILI by improving cytokines and increasing the adherens junctions, protein E-cadherin and p120-catenin, to enhance the epithelial barrier function.

Citing Articles

The Effects of Airway Pressure Release Ventilation on Pulmonary Permeability in Severe Acute Respiratory Distress Syndrome Pig Models.

Cheng J, Yang J, Ma A, Dong M, Yang J, Wang P Front Physiol. 2022; 13:927507.

PMID: 35936889 PMC: 9354663. DOI: 10.3389/fphys.2022.927507.

YAP Deficiency Attenuates Pulmonary Injury Following Mechanical Ventilation Through the Regulation of M1/M2 Macrophage Polarization.

Luo Q, Luo J, Wang Y J Inflamm Res. 2021; 13:1279-1290.

PMID: 33408500 PMC: 7781043. DOI: 10.2147/JIR.S288244.

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