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Morphine induces HADHA succinylation, while HADHA desuccinylation alleviates morphine tolerance by influencing autophagy

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Abstract

Morphine tolerance is an important factor in unsatisfactory analgesia. HADHA is a crucial enzyme in fatty acid β-oxidation. In this study, we investigated the potential significance of HADHA in a mechanism that might cause morphine tolerance related to functional changes in energy metabolism and further explored the effect of HADHA desuccinylation on morphine tolerance. Rats received daily intrathecal injections of 10 µg of morphine for a duration of 7 consecutive days, and pain thresholds were measured using the mechanical withdrawal threshold (MWT) and thermal tail flick latency (TFL) tests. µ-Opioid receptor (MOR), LC3-I/II, and P62 expression and HADHA succinylation were assessed. HADHA succinylation was analyzed by liquid chromatography–tandem mass spectrometry (LC‒MS/MS) and parallel reaction monitoring (PRM). Morphine influenced the LC3II/LC3I ratio and P62 expression level, which are crucial indicators of autophagy, and stimulated HADHA succinylation. Additionally, HADHA was selectively bound by the desuccinylase SIRT5, and SIRT5 overexpression decreased HADHA succinylation, reduced P62 expression, and alleviated morphine tolerance.

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The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors acknowledge Guiyang Beilong Biotechnology Co., Ltd., for providing the necessary reagents.

Funding

This study was funded by the Science and Technology Program of Guizhou Provincial Health Commission (gzwkj2023-395) and Guizhou Province Science and Technology Plan Project (grant no.: Qianke He Foundation‐ZK[2021]General 508).

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WL provided the overall design of the experiment. SHL and YXH both performed the experiment and analyzed the data. YC and YYF provided helpful comments. SHL completed the manuscript with the help of WL. All authors have read and approved the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.

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Correspondence to Wei Lu.

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The animal study was carried out in accordance with the policies of the China Animal Protection and Use Committee and was approved by the Laboratory Animal Committee of Guizhou Medical University (no. 2200531).

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The authors declare no competing interests.

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Yuanxin Huang and Sihui Lu share first authorship.

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Huang, Y., Lu, S., Chen, Y. et al. Morphine induces HADHA succinylation, while HADHA desuccinylation alleviates morphine tolerance by influencing autophagy. Naunyn-Schmiedeberg's Arch Pharmacol 397, 1589–1600 (2024). https://doi.org/10.1007/s00210-023-02697-x

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