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The alpha-lipoic acid derivative DHLHZn: a new therapeutic agent for acute lung injury in vivo

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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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Correspondence to Hiroya Takeuchi.

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The authors declare that they have no conflict of interest.

Ethical approval

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

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