Gpr158 mediates osteocalcinÕs regulation of cognition

Authors
L Khrimian, A Obri, M Ramos-Brossier, A Rousseaud, S Moriceau, A-S Nicot, P Mera, S Kosmidis, T Karnavas, F Ssudou, X-B Gao, F Oury, E Kandel, G Karsenty


Lab
Department of Genetics and Development, Columbia University Medical Center, New York, NY

Journal
Journal of Experimental Medicine

Abstract
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 proteinÐcoupled receptor expressed in neurons of the CA3 region of the hippocampus, as transducing OCNÕs 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.

BIOSEB Instruments Used:
Startle and Fear System (BX-START&FEAR)

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