Abstract
Up to 45% of patients surviving from transient global cerebral ischemia (GCI) after cardiac arrest develop post-global cerebral ischemia depression (PGCID), but how to treat PGCID is clinically unknown. Here we find that cannabinoid type-1 receptor (CB1R) antagonists, CB1R knockout and endocannabinoid (eCB) synthesis inhibition block acute stress-induced PGCID. Application of acute stress to GCI mice increases CB1R activity from ventromedial prefrontal cortical (vmPFC) terminals synapsing with the basolateral amygdala (BLA) neurons, indicating the involvement of increased vmPFC-BLA synaptic eCB signaling in PGCID induction. This idea is supported by findings that optogenetic activation of CB1Rs in vmPFC-BLA projections mimics stress effects to induce PGCID, which is blocked by knock-down of eCB biosynthesis enzyme genes in vmPFC-BLA synapses. Interestingly, GCI mice show decreased mRNA expression of eCB degradation enzymes in vmPFCs without significant changes on mRNA expression of eCB biosynthesis and degradation enzymes in BLA cells. Thus, over-expression of eCB degradation enzymes in vmPFC cells innervating BLA neurons or activation of vmPFC-BLA projections blocks stress effects to induce PGCID. Our findings suggest that decreased eCB degradation and subsequent stress-increased eCB signaling in vmPFC-BLA circuits participate in the mechanism of PGCID, which can be treated clinically by eCB signaling interference systemically or in vmPFC-BLA circuits.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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The Major program of Technological innovation 2030 “Brain science and brain-inspired research” (2021ZD0203002); Key Project from the National Natural Science Foundation of China (81830035); The Major program of National Natural Science Foundation of China (82090033); The Major Basic research program of Shandong Province Natural Science Foundation (ZR2019ZD35); National Natural Science Foundation of China (32371187,32000788); Natural Science Foundation of Shandong Province (ZR2024MH063).exte.
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XX, ZT, YM, FG, HX, HS, SZ, BX, YQ and NZ performed the research; XZ and XX analyzed data; XZ conceived the project and wrote the manuscript with the help of XX, JC, YL, and JH.
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Tu, Z., Ma, Y., Shang, H. et al. Endocannabinoid interference blocks post-global cerebral ischemia depression through prefrontal cortico-amygdala projections. Neuropsychopharmacol. 50, 1063–1074 (2025). https://doi.org/10.1038/s41386-024-02029-4
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DOI: https://doi.org/10.1038/s41386-024-02029-4


