Contribution of Altered Endocannabinoid System to Overactive mTORC1 Signaling in Focal Cortical Dysplasia
Por:
García-Rincón D, Díaz-Alonso J, Paraíso-Luna J, Ortega Z, Aguareles J, de Salas-Quiroga A, Jou-Munoz C, de Prada I, Martínez-Cerdeño V, Aronica E, Guzmán M, Pérez-Jiménez MÁ and Galve-Roperh I
Publicada:
9 ene 2019
Ahead of Print:
9 ene 2019
Resumen:
Alterations of the PI3K/Akt/mammalian target of rapamycin complex 1 (mTORC1) signaling pathway are causally involved in a subset of malformations of cortical development (MCDs) ranging from focal cortical dysplasia (FCD) to hemimegalencephaly and megalencephaly. These MCDs represent a frequent cause of refractory pediatric epilepsy. The endocannabinoid system -especially cannabinoid CB1 receptor- exerts a neurodevelopmental regulatory role at least in part via activation of mTORC1 signaling. Therefore, we sought to characterize the possible contribution of endocannabinoid system signaling to FCD. Confocal microscopy characterization of the CB1 receptor expression and mTORC1 activation was conducted in FCD Type II resection samples. FCD samples were subjected to single nucleotide polymorphism screening for endocannabinoid system elements, as well as CB1 receptor gene sequencing. Cannabinoid CB1 receptor levels were increased in FCD with overactive mTORC1 signaling. CB1 receptors were enriched in phospho-S6-positive cells including balloon cells (BCs) that co-express aberrant markers of undifferentiated cells and dysplastic neurons. Pharmacological regulation of CB1 receptors and the mTORC1 pathway was performed in fresh FCD-derived organotypic cultures. HU-210-evoked activation of CB1 receptors was unable to further activate mTORC1 signaling, whereas CB1 receptor blockade with rimonabant attenuated mTORC1 overactivation. Alterations of the endocannabinoid system may thus contribute to FCD pathological features, and blockade of cannabinoid signaling might be a new therapeutic intervention in FCD.
Filiaciones:
García-Rincón D:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Díaz-Alonso J:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Paraíso-Luna J:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Ortega Z:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Aguareles J:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
de Salas-Quiroga A:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Jou-Munoz C:
Departamento de Anatomía Patológica, Hospital Sant Joan de Déu, Barcelona, Spain
de Prada I:
Hospital Infantil Universitario Niño Jesús, Madrid, Spain
Martínez-Cerdeño V:
Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children of Northern California and Department of Pathology and Laboratory Medicine, School of Medicine, University of California, Davis, Sacramento, CA, United States
Aronica E:
Amsterdam UMC, Department of (Neuro)Pathology, Amsterdam Neuroscience, University of Amsterdam, Amsterdam, Netherlands
Stichting Epilepsie Instellingen Nederland, Heemstede, Netherlands
Guzmán M:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Pérez-Jiménez MÁ:
Hospital Infantil Universitario Niño Jesús, Madrid, Spain
Galve-Roperh I:
Instituto Ramón y Cajal de Investigación Sanitaria, Department of Biochemistry and Molecular Biology and Instituto Universitario de Investigación Neuroquímica, Complutense University, Madrid, Spain
Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Madrid, Spain
Green Accepted, Green Submitted, gold
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