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MHTP, a synthetic tetratetrahydroisoquinoline alkaloid, attenuates lipopolysaccharide-induced acute lung injury via p38MAPK/p65NF-κB signaling pathway-TLR4 dependent

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Abstract

Introduction

This study investigated the mechanism of action of a synthetic tetrahydroisoquinoline alkaloid, MHTP, in an experimental model of acute lung injury (ALI) in two distinct moments: 72 h and 10 days.

Methodology

To realize this study, 2.5 mg/kg of lipopolysaccharide (LPS) was intranasally administered in BALB/c mice, and nasal instillation of MHTP (1.25; 2.5; 5.0; 10 or 20 mg/kg) was administrated at 1, 24, and 48 h after LPS challenge. The data were statistically analyzed and p < 0.05 was considered statistically significant.

Results

MHTP treatment (2.5, 5.0, 10 or 20 mg/kg) significantly decreased neutrophil migration into the bronchoalveolar lavage fluid (BALF), tissue inflammatory cell infiltration, edema, and hemorrhage as well as collagen fiber deposition on the perialveolar regions at both moments. TNF-α and IL-6 levels were significantly diminished in the MHTP-treated animals at 72 h and maintained them, at a basal level, at 10-day observation. These effects of MHTP are due to downregulating p38MAPkinese/p65NFκB signaling pathway-TLR4 dependent. Also, the MHTP treatment promoted a survival rate at 100% and improved their body weights during the 10-day observation. Unlike, the LPS group (non-treated LPS challenged animals) presented less than 50% of surviving rate at 72 h and the animals that survived did not improve their physiological state at 10-day observation.

Conclusions

These data showed for the first time the beneficial and effective activity of a nasal treatment with a synthetic tetrahydroisoquinoline alkaloid on an experimental model of ALI and pointed out the molecular mechanism related to it.

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Acknowledgements

The Brazilian government sponsored this study by CNPq and CAPES organizations.

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Authors

Contributions

MRP, BMNX and LAMPF conceived and designed the experiments. BMNX, LAMPF, and LKDPF performed experimental model of acute lung injury. BMNX, LAMPF, LKDPF, and TMM performed ELISA and flow cytometry experiments. LAAS and LCR performed the synthesis of MHTP. BMNX, LAMPF, and FAAFG performed the lung histology. BMNX, LAMPF, LKDPF, and MRP analyzed the data and MRP wrote the paper.

Corresponding author

Correspondence to Marcia Regina Piuvezam.

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do Nascimento Xavier, B.M., Ferreira, L.A.M.P., Ferreira, L.K.D.P. et al. MHTP, a synthetic tetratetrahydroisoquinoline alkaloid, attenuates lipopolysaccharide-induced acute lung injury via p38MAPK/p65NF-κB signaling pathway-TLR4 dependent. Inflamm. Res. 68, 1061–1070 (2019). https://doi.org/10.1007/s00011-019-01291-3

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