Fatty acid-binding protein 7 gene deletion promotes decreases in brain cannabinoid type 1 receptor binding

Huy Lu; Nicole Roeder; Brittany Richardson; John Hamilton; Abhisheak Sharma; Yuji Owada; Yoshiteru Kagawa; Panayotis Thanos

doi:10.1016/j.neulet.2024.138040

Fatty acid-binding protein 7 gene deletion promotes decreases in brain cannabinoid type 1 receptor binding

Neurosci Lett. 2024 Nov 13:844:138040. doi: 10.1016/j.neulet.2024.138040. Online ahead of print.

Authors

Huy Lu¹, Nicole Roeder², Brittany Richardson², John Hamilton², Abhisheak Sharma³, Yuji Owada⁴, Yoshiteru Kagawa⁵, Panayotis Thanos⁶

Affiliations

¹ Behavioral Neuropharmacology and Neuroimaging Laboratory on Addictions, Clinical Research Institute on Addictions, Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biosciences, University at Buffalo, Buffalo, NY, USA.
² Behavioral Neuropharmacology and Neuroimaging Laboratory on Addictions, Clinical Research Institute on Addictions, Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biosciences, University at Buffalo, Buffalo, NY, USA; Department of Psychology, State University at Buffalo, Buffalo, NY, USA.
³ Department of Pharmaceutics, University of Florida, Gainesville, FL 32610, USA.
⁴ Department of Organ Anatomy, Graduate School of Medicine, Tohoku University, Seiryo-cho 2-1, Aobaku, Sendai 980-8575, Japan.
⁵ Department of Organ Anatomy, Graduate School of Medicine, Tohoku University, Seiryo-cho 2-1, Aobaku, Sendai 980-8575, Japan; Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3052, Australia.
⁶ Behavioral Neuropharmacology and Neuroimaging Laboratory on Addictions, Clinical Research Institute on Addictions, Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biosciences, University at Buffalo, Buffalo, NY, USA; Department of Psychology, State University at Buffalo, Buffalo, NY, USA. Electronic address: thanos@buffalo.edu.

PMID: 39542341
DOI: 10.1016/j.neulet.2024.138040

Abstract

Fatty acid-binding protein 7 (FABP7) aids in the intracellular transport of endogenous cannabinoids and is involved in regulating the stress response system. This study examined the role of FABP7 in chronic stress exposure through the binding of CB1 receptors. Adult male FABP7^+/+ and FABP7^-/- mice were treated with the unpredictable chronic mild stress (UCMS) procedure. After 28 days of treatment, mice were euthanized, and CB1 was measured with in vitro autoradiography using [3H] SR141716A. FABP7^-/- mice, irrespective of stress treatment, showed reduced [3H] SR141716A binding in the amygdala, secondary somatosensory cortex, and ventral caudate putamen compared with the FABP7^+/+ mice. Additionally, FABP7^-/- mice treated with UCMS exhibited a reduction in CB1 binding in the globus pallidus and ventral caudate putamen compared with UCMS-treated FABP7^+/+ mice. Genetic deletion of FABP7 can decrease CB1 expression in various brain regions; however, the underlying mechanism remains unclear.

Keywords: CB1 receptors; Endocannabinoid; Fatty acid-binding protein 7; Inhibitory synapse; Unpredictable chronic mild stress.