Gpr158 mediates osteocalcin’s regulation of cognition

• Published in: The Journal of experimental medicine Vol. 214; no. 10; pp. 2859 - 2873
• Main Authors: Khrimian, Lori, Obri, Arnaud, Ramos-Brossier, Mariana, Rousseaud, Audrey, Moriceau, Stéphanie, Nicot, Anne-Sophie, Mera, Paula, Kosmidis, Stylianos, Karnavas, Theodoros, Saudou, Frederic, Gao, Xiao-Bing, Oury, Franck, Kandel, Eric, Karsenty, Gerard
• Format: Journal Article
• Language: English
• Published: United States Rockefeller University Press 02.10.2017; The Rockefeller University Press
• Subjects: Age; Aging - physiology; Animals; Anxiety; Biocompatibility; Brain; Brain-derived neurotrophic factor; CA3 Region, Hippocampal - drug effects; CA3 Region, Hippocampal - physiology; Cognition; Cognition - drug effects; Cognition - physiology; Cognitive ability; Electrophysiology; Female; Hipocamp (Cervell); Hippocampus; Hippocampus (Brain); Hormones peptídiques; Inositol 1,4,5-trisphosphate receptors; Life Sciences; Male; Maze Learning - drug effects; Maze Learning - physiology; Memory; Memory - drug effects; Memory - physiology; Memòria; Mice; Mice, Inbred C57BL; Mice, Knockout; Neurons; Ossificació; Ossification; Osteocalcin; Osteocalcin - pharmacology; Osteocalcin - physiology; Peptide hormones; Receptors, G-Protein-Coupled - physiology; Rodents; Therapeutic applications
• ISSN: 0022-1007; 1540-9538; 1540-9538
• DOI: 10.1084/jem.20171320

That osteocalcin (OCN) is necessary for hippocampal-dependent memory and to prevent anxiety-like behaviors raises novel questions. One question is to determine whether OCN is also sufficient to improve these behaviors in wild-type mice, when circulating levels of OCN decline as they do with age. Here we show that the presence of OCN is necessary for the beneficial influence of plasma from young mice when injected into older mice on memory and that peripheral delivery of OCN is sufficient to improve memory and decrease anxiety-like behaviors in 16-mo-old mice. A second question is to identify a receptor transducing OCN signal in neurons. Genetic, electrophysiological, molecular, and behavioral assays identify Gpr158, an orphan G protein–coupled receptor expressed in neurons of the CA3 region of the hippocampus, as transducing OCN’s regulation of hippocampal-dependent memory in part through inositol 1,4,5-trisphosphate and brain-derived neurotrophic factor. These results indicate that exogenous OCN can improve hippocampal-dependent memory in mice and identify molecular tools to harness this pathway for therapeutic purposes.