Abstract
The mechanism underlying the hypnosis effect of propofol is still not fully understood. In essence, the nucleus accumbens (NAc) is crucial for regulating wakefulness and may be directly engaged in the principle of general anesthesia. However, the role of NAc in the process of propofol-induced anesthesia is still unknown. We used immunofluorescence, western blotting, and patch-clamp to access the activities of NAc GABAergic neurons during propofol anesthesia, and then we utilized chemogenetic and optogenetic methods to explore the role of NAc GABAergic neurons in regulating propofol-induced general anesthesia states. Moreover, we also conducted behavioral tests to analyze anesthetic induction and emergence. We found out that c-Fos expression was considerably dropped in NAc GABAergic neurons after propofol injection. Meanwhile, patch-clamp recording of brain slices showed that firing frequency induced by step currents in NAc GABAergic neurons significantly decreased after propofol perfusion. Notably, chemically selective stimulation of NAc GABAergic neurons during propofol anesthesia lowered propofol sensitivity, prolonged the induction of propofol anesthesia, and facilitated recovery; the inhibition of NAc GABAergic neurons exerted opposite effects. Furthermore, optogenetic activation of NAc GABAergic neurons promoted emergence whereas the result of optogenetic inhibition was the opposite. Our results demonstrate that NAc GABAergic neurons modulate propofol anesthesia induction and emergence.
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The datasets and/or analysis are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank Jia-Tao Lin, Shuai Li, and Cheng-Hua Zhou for their assistance during the preparation of this manuscript.
Funding
This research was supported by the National College Students Innovation and Entrepreneurship Training Program (202110313012Z) and the National Natural Science Foundation of China (81971051, 82171191, 82101281, 82271233, 81970994).
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Under the guidance and supervision of Yu-Qing Wu, Hui Zheng, and Shuai Li, Jing Yan completed its design, coordination, and optogenetic/chemical genetics experiment. Bei-Ning Hang and Lin-Hui Ma performed the propofol anesthesia, sample preparation, immunofluorescence staining, and electroencephalogram analysis. Jia-Tao Lin performed in vitro electrophysiology recordings. All the authors participated in data collection and statistical analysis. The manuscript was written by Jing Yan. All the authors have read and approved the final manuscript. Yu-Qing Wu, Hui Zheng, and Shuai Li secured funding for the project.
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Yan, J., Hang, BN., Ma, LH. et al. GABAergic Neurons in the Nucleus Accumbens are Involved in the General Anesthesia Effect of Propofol. Mol Neurobiol 60, 5789–5804 (2023). https://doi.org/10.1007/s12035-023-03445-1
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DOI: https://doi.org/10.1007/s12035-023-03445-1