Advances in Clinical and Experimental Medicine

Title abbreviation: Adv Clin Exp Med
JCR Impact Factor (IF) – 2.1
5-Year Impact Factor – 2.2
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Index Copernicus  – 161.11; MEiN – 140 pts

ISSN 1899–5276 (print)
ISSN 2451-2680 (online)
Periodicity – monthly

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Advances in Clinical and Experimental Medicine

2020, vol. 29, nr 7, July, p. 813–817

doi: 10.17219/acem/121936

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

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Ketamine alleviates HMGB1-induced acute lung injury through TLR4 signaling pathway

Dong Xu1,B,C, Xang Sun2,A,B, Yang Zhang3,E,F, Li Cao1,C,D

1 Department of Anesthesiology, Jinan Central Hospital Affiliated to Shandong University, China

2 Department of Intensive Care Unit, Jinan Central Hospital Affiliated to Shandong University, China

3 Department of Anesthesiology, Binzhou People’s Hospital, China


Background. Acute lung injury (ALI) is a common critical respiratory disease that seriously threatens human health. Ketamine has good anti-inflammatory and immune-regulating properties that can delay the lung injury process.
Objectives. High mobility group box protein 1 (HMGB1) plays an important role in the occurrence, development and treatment of ALI. Toll-like receptor 4 (TLR4) is the receptor for HMGB1. The aim of this study was to determine the role of the HMGB1 TLR4 signaling pathway in the treatment of ALI using ketamine.
Material and Methods. A total of 30 healthy, male, 8-week-old Sprague-Dawley rats were randomly, equally divided into a control group, an lipopolysaccharide (LPS) group and a ketamine group. In order to establish a rat ALI model, 15 mg/kg of LPS was injected into the femoral veins. Ketamine was intravenously injected (10 mg/kg) into the experimental group rats. The rats were euthanized 24 h after modeling and lung tissue samples were collected. Western blot was used to test TLR4, MyD88, TRAF-6, LOX-1, and HMGB1 protein expression in the lung tissue. Real-time polymerase chain reaction (RT-PCR) was performed to detect TLR4, MyD88, TRAF-6, LOX-1, and HMGB1 mRNA levels.
Results. Compared with the controls, the LPS group had significantly higher TLR4, MyD88, TRAF-6, LOX-1, and HMGB1 mRNA and protein levels (p < 0.05). These levels were significantly lower after ketamine intervention in comparison with the LPS group (p < 0.05). A positive correlation was found between TLR4 and HMGB1 expression in the LPS and ketamine groups (r = 0.952, p < 0.001; r = 0.941, p < 0.001).
Conclusion. Ketamine attenuates HMGB1-induced ALI, possibly by regulating the TLR4 signaling pathway.

Key words

ketamine, acute lung injury, TLR4, HMGB1

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