Abstract
Objective and design
An animal experiment was performed to demonstrate the anti-inflammatory effects of an alpha-lipoic acid (ALA) derivative, dihydrolipoyl histidinate zinc complex (DHLHZn) for acute lung injury (ALI) and to investigate the mechanism of action.
Material
Rats were randomly divided into three experimental groups: control group (n = 17), DHLHZn(−) group (n = 11, ALI model rats), and DHLHZn(+) group (n = 12, ALI model rats treated by DHLHZn).
Treatment
Lipopolysaccharides (LPS, 10 mg/kg) were administered intratracheally in the DHLHZn(−) group and the DHLHZn(+) group. For the DHLHZn(+) group, DHLHZn (100 mg/kg) was administered intraperitoneally 2 h prior to LPS administration.
Methods
Four hours after LPS administration, bronchoalveolar lavage fluid (BALF) and lung tissue were collected. The findings were analyzed using the Mann–Whitney U test.
Results
Total number of cells, number of neutrophils and lymphocytes, levels of various inflammatory cytokines, and NF-kB p65 concentration of BALF were significantly lower in the DHLHZn(+) group than in the DHLHZn(−) group (p < 0.05). ALI pathology scores were significantly lower in the DHLHZn(+) group than in the DHLHZn(−) group (p < 0.001).
Conclusions
Anti-inflammatory effects of DHLHZn for ALI were demonstrated by BALF and histopathological findings. The mechanism of action of DHLHZn was considered to be via inhibition of the NF-kB signaling pathway. DHLHZn is thus suggested to be a new prophylactic agent for ALI.
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Acknowledgements
The authors are grateful to Seigo Kitano, MD, PhD, FACS, the president of Oita University, for assisting in the study and its publication.
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All procedures performed in studies involving animals were in accordance with The Keio University Institutional Animal Care and Use Committee (Approval Number: 08073).
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Responsible Editor: Yoshiya Tanaka.
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Shoji, Y., Takeuchi, H., Fukuda, K. et al. The alpha-lipoic acid derivative DHLHZn: a new therapeutic agent for acute lung injury in vivo. Inflamm. Res. 66, 803–811 (2017). https://doi.org/10.1007/s00011-017-1059-x
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DOI: https://doi.org/10.1007/s00011-017-1059-x