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Article

Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70

  • Authors:
    • Haitang Wang
    • Yinv Dong
    • Yehua Cai
  • View Affiliations / Copyright

    Affiliations: Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China, Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510280, P.R. China
  • Pages: 2807-2813
    |
    Published online on: June 30, 2017
       https://doi.org/10.3892/mmr.2017.6896
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Abstract

At present, the timing of glutamine administration remains controversial. The aim of the present study was to confirm the early protective mechanisms of alanyl‑glutamine (Ala‑Gln) against lipopolysaccharide (LPS)‑induced lung injury, as well as to detect the best time for Ala‑Gln usage. A total of 60 adult Wistar rats were randomly divided into 6 groups: The control group (C), the LPS‑induced shock group (LPS), the pre‑Ala‑Gln treated group (A1) and the pre‑Gln treated group (G1), which separately received 4.5% Dipeptiven and 3% glutamine just before LPS administration; the post‑Ala‑Gln treated group (A2) and the post‑Gln treated group (G2), which was respectively infused with 4.5% Dipeptiven and 3% glutamine at 1 h following LPS. Survival rates were observed at 6 h following the LPS injection. Blood samples were drawn for analysis of cytokine levels 1 h prior to (T0) and 6 h following (T1) LPS injection. All rats were killed at T1 and the pulmonary samples were collected. Plasma concentrations of tumor necrosis factor‑α, interleukin (IL)‑1β and IL‑8 at T0 and T1, apoptosis in lung epithelial cells and the expression of heat shock protein (HSP)70 were detected. The lung wet/dry weight ratio (W/D) and the content of protein in the bronchoalveolar lavage fluid (BALF) were also determined. Survival rates at 6 h following (T1) LPS administration were both 100% in groups A1 and G2, but 70% in A2 and G2 groups. The W/D, the content of protein in BALF and cytokine levels were significantly lower in groups A1 and G1 than that in group LPS (P<0.05) at T1. The apoptosis index of both alveolar and bronchial epithelial cells was obviously lower in A1 and G1 groups than that in the LPS group (P<0.05). Gray gradients of HSP70 in the A1 and G1 groups were dramatically higher than those of group LPS (P<0.05). In conclusion, pre‑administration of Ala‑Gln just before LPS can effectively protect the lung by enhancing HSP70 expression, but delayed administration cannot protect LPS‑induced lung injury.
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Copy and paste a formatted citation
Spandidos Publications style
Wang H, Dong Y and Cai Y: Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70. Mol Med Rep 16: 2807-2813, 2017.
APA
Wang, H., Dong, Y., & Cai, Y. (2017). Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70. Molecular Medicine Reports, 16, 2807-2813. https://doi.org/10.3892/mmr.2017.6896
MLA
Wang, H., Dong, Y., Cai, Y."Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70". Molecular Medicine Reports 16.3 (2017): 2807-2813.
Chicago
Wang, H., Dong, Y., Cai, Y."Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70". Molecular Medicine Reports 16, no. 3 (2017): 2807-2813. https://doi.org/10.3892/mmr.2017.6896
Copy and paste a formatted citation
x
Spandidos Publications style
Wang H, Dong Y and Cai Y: Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70. Mol Med Rep 16: 2807-2813, 2017.
APA
Wang, H., Dong, Y., & Cai, Y. (2017). Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70. Molecular Medicine Reports, 16, 2807-2813. https://doi.org/10.3892/mmr.2017.6896
MLA
Wang, H., Dong, Y., Cai, Y."Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70". Molecular Medicine Reports 16.3 (2017): 2807-2813.
Chicago
Wang, H., Dong, Y., Cai, Y."Alanyl‑glutamine prophylactically protects against lipopolysaccharide‑induced acute lung injury by enhancing the expression of HSP70". Molecular Medicine Reports 16, no. 3 (2017): 2807-2813. https://doi.org/10.3892/mmr.2017.6896
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