Abstract
Cannabis is the third most commonly used psychoactive substance of abuse, yet it also receives considerable attention as a potential therapeutic drug. Therefore, it is essential to fully understand the actions of cannabis in the human brain. The olfactory neuroepithelium (ON) is a peripheral nervous tissue that represents an interesting surrogate model to study the effects of drugs in the brain, since it is closely related to the central nervous system, and sensory olfactory neurons are continually regenerated from populations of stem/progenitor cells that undergo neurogenesis throughout life. In this study, we used ON cells from chronic cannabis users and healthy control subjects to assess alterations in relevant cellular processes, and to identify changes in functional proteomic pathways due to cannabis consumption. The ON cells from cannabis users exhibited alterations in the expression of proteins that were related to the cytoskeleton, cell proliferation and cell death, as well as, changes in proteins implicated in cancer, gastrointestinal and neurodevelopmental pathologies. Subsequent studies showed cannabis provoked an increase in cell size and morphological alterations evident through β-Tubulin III staining, as well as, enhanced beta-actin expression and a decrease in the ability of ON cells to undergo cell attachment, suggesting abnormalities of the cytoskeleton and cell adhesion system. Furthermore, these cells proliferated more and underwent less cell death. Our results indicate that cannabis may alter key processes of the developing brain, some of which are similar to those reported in mental disorders like DiGeorge syndrome, schizophrenia and bipolar disorder.
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Acknowledgements
We would like to thank Dr. Antonia Díaz Gañete for her excellent assistance at the beginning of this project, the CIC-Biogune Proteomics platform, especially Dr. Ibon Iloro and Dr. Felix Elortza for their technical assistance. Network images were obtained with IPA, thanks to the assistance provided by the PAB (Andalusian Bioinformatics Platform) center, University of Malaga. We would like to acknowledge the Clinical Research Unit at the IMIM-Hospital del Mar Research Institute for their expertise in nasal brushing, especially to Marta Pérez Otero and Dr. Ana M. Aldea Perona, and to Dr. Aida Cuenca-Royo for the neuropsychological evaluation.
Funding
This study was supported by grants co-financed by the “Fondo Europeo de Desarrollo Regional” (FEDER)-UE “A way to build Europe” from the “Programa Operativo de Andalucía FEDER, Iniciativa Territorial Integrada ITI 2014-2020 Consejería Salud, Junta de Andalucía” (PI-0009-2017); the “Consejería de Economía, Innovación, Ciencia y Empleo de la Junta de Andalucía” (CTS-510); Plan Nacional sobre Drogas (2019I041), the “Ministerio de Economía, Industria y Competitividad (“Juan de la Cierva Incorporación” postdoctoral grant IJCI-2015-23280), the “Centro de Investigación Biomédica en Red de Salud Mental-CIBERSAM” (CB/07/09/0033; CB/07/09/0029) and Instituto de Salud Carlos III, Ministerio de Ciencia e Innovación de España y fondos FEDER (PI18/00053 to P.R.).
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ADS and MHF performed the experiments, collected and analysed the data and prepared the original draft of the manuscript; MCDR and ISG collaborated on the proteomics studies and the studies of apoptosis; CC and NGD collaborated with the cell cultures and immunocytochemical studies; CFA and MBC initially processed the samples and handled the primary cell cultures. PR and RT participated in planning the experiment, and provided financial support. ACR performed the neuropsychological evaluation; EB designed and supervised the research study and wrote the manuscript. All the authors reviewed and approved the final version of the manuscript submitted.
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Delgado-Sequera, A., Hidalgo-Figueroa, M., Barrera-Conde, M. et al. Olfactory Neuroepithelium Cells from Cannabis Users Display Alterations to the Cytoskeleton and to Markers of Adhesion, Proliferation and Apoptosis. Mol Neurobiol 58, 1695–1710 (2021). https://doi.org/10.1007/s12035-020-02205-9
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DOI: https://doi.org/10.1007/s12035-020-02205-9