Abstract
With increasing maternal cannabis use, there is a need to investigate the lasting impact of prenatal exposure to Δ9-tetrahydrocannabinol (THC), the main psychotropic compound in cannabis, on cognitive/memory function. The endocannabinoid system (ECS), which relies on polyunsaturated fatty acids (PUFAs) to function, plays a crucial role in regulating prefrontal cortical (PFC) and hippocampal network-dependent behaviors essential for cognition and memory. Using a rodent model of prenatal cannabis exposure (PCE), we report that male and female offspring display long-term deficits in various cognitive domains. However, these phenotypes were associated with highly divergent, sex-dependent mechanisms. Electrophysiological recordings revealed hyperactive PFC pyramidal neuron activity in both males and females, but hypoactivity in the ventral hippocampus (vHIPP) in males, and hyperactivity in females. Further, cortical oscillatory activity states of theta, alpha, delta, beta, and gamma bandwidths were strongly sex divergent. Moreover, protein expression analyses at postnatal day (PD)21 and PD120 revealed primarily PD120 disturbances in dopamine D1R/D2 receptors, NMDA receptor 2B, synaptophysin, gephyrin, GAD67, and PPARα selectively in the PFC and vHIPP, in both regions in males, but only the vHIPP in females. Lastly, using matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS), we identified region-, age-, and sex-specific deficiencies in specific neural PUFAs, namely docosahexaenoic acid (DHA) and arachidonic acid (ARA), and related metabolites, in the PFC and hippocampus (ventral/dorsal subiculum, and CA1 regions). This study highlights several novel, long-term and sex-specific consequences of PCE on PFC-hippocampal circuit dysfunction and the potential role of specific PUFA signaling abnormalities underlying these pathological outcomes.
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Acknowledgements
This work was supported by the Canadian Institutes of Health Research (CIHR) with grant #MOP-123378 to SRL, Canadian Institutes of Health Research Catalyst Grant #CRU1126 to D.B.H, as well as the Natural Sciences and Engineering Research Council of Canada (NSERC). The authors also greatly acknowledge the assistance of Ms. Kristina Jurcic (University of Western Ontario, UWO, MALDI-MS Facility) for assistance in the acquisition of MS and MS/MS spectra. Operational funding of this facility was provided by the Schulich School of Medicine and Dentistry and the Departments of Chemistry and Biochemistry, UWO.
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MHS and SRL designed research; MHS, SC, MDF, HJS, KKWW, MR-R, MVD, DG, EP, and THJN, RH, TJ performed research; KL, DH, KK-CY, SS and WJR contributed unpublished reagents/analytic tools and advised on experimental designs; MHS, SC, MDF and KKWW analyzed data; MHS and SRL wrote the paper with contributions from other authors.
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Sarikahya, M.H., Cousineau, S.L., De Felice, M. et al. Prenatal THC exposure induces long-term, sex-dependent cognitive dysfunction associated with lipidomic and neuronal pathology in the prefrontal cortex-hippocampal network. Mol Psychiatry 28, 4234–4250 (2023). https://doi.org/10.1038/s41380-023-02190-0
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DOI: https://doi.org/10.1038/s41380-023-02190-0
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