Carnitine palmitoyltransferase 1C negatively regulates the endocannabinoid hydrolase ABHD6 in mice, depending on nutritional status.

Cristina Miralpeix, Ana Cristina Reguera, Anna Fosch, Maria Casas, Jaume Lillo, Gemma Navarro, Rafael Franco, Josefina Casas, Stephen P.H. Alexander, Núria Casals, Rosalía Rodríguez‐Rodríguez
Br J Pharmacol. 2021-02-12; 178(7): 1507-1523
DOI: 10.1111/bph.15377

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Miralpeix C(1)(2), Reguera AC(1), Fosch A(1), Casas M(1)(3), Lillo J(4), Navarro G(2), Franco R(2), Casas J(5)(6), Alexander SPH(7), Casals N(1)(8),
Rodríguez-Rodríguez R(1).

Author information:
(1)Basic Sciences Department, Faculty of Medicine and Health Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain.
(2)INSERM, Neurocentre Magendie, University of Bordeaux, Bordeaux, France.
(3)Department of Physiology and Membrane Biology, University of California, Davis, Davis, California, USA.
(4)Molecular Neurobiology Laboratory, Department of Biochemistry and Physiology, Faculty of Biology, University of Barcelona, Barcelona, Spain.
(5)Department on Biomedical Chemistry, Research Unit of BioActive Molecules, Institut de Química Avançada de Catalunya (IQAC), Barcelona, Spain.
(6)Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, Madrid, Spain.
(7)School of Life Sciences, University of Nottingham, Nottingham, UK.
(8)Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, Madrid, Spain.

BACKGROUND AND PURPOSE: The enzyme α/β-hydrolase domain containing 6 (ABHD6), a new member of the endocannabinoid system, is a promising therapeutic target against neuronal-related diseases. However, how ABHD6 activity is regulated is not known. ABHD6 coexists in protein complexes with the brain-specific carnitine palmitoyltransferase 1C (CPT1C). CPT1C is involved in neuro-metabolic functions,
depending on brain malonyl-CoA levels. Our aim was to study CPT1C-ABHD6 interaction and determine whether CPT1C is a key regulator of ABHD6 activity depending on nutritional status.

EXPERIMENTAL APPROACH: Co-immunoprecipitation and FRET assays were used to explore ABHD6 interaction with CPT1C or modified malonyl-CoA-insensitive or C-terminal truncated CPT1C forms. Cannabinoid CB1 receptor-mediated signalling was investigated by determining cAMP levels. A novel highly sensitive fluorescent method was optimized to measure ABHD6 activity in non-neuronal and neuronal cells and in brain tissues from wild-type (WT) and CPT1C-KO mice.

KEY RESULTS: CPT1C interacted with ABHD6 and negatively regulated its hydrolase activity, thereby regulating 2-AG downstream signalling. Accordingly, brain tissues of CPT1C-KO mice showed increased ABHD6 activity. CPT1C malonyl-CoA sensing was key to the regulatory role on ABHD6 activity and CB1 receptor signalling. Fasting, which attenuates brain malonyl-CoA, significantly increased ABHD6 activity in hypothalamus from WT, but not CPT1C-KO, mice.

CONCLUSIONS AND IMPLICATIONS: Our finding that negative regulation of ABHD6 activity, particularly in the hypothalamus, is sensitive to nutritional status throws new light on the characterization and the importance of the proteins involved as potential targets against diseases affecting the CNS.

© 2021 The Authors. British Journal of Pharmacology published by John Wiley & Sons Ltd on behalf of British Pharmacological Society.


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