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Journal Articles Journal of Comparative Neurology Year : 2012

Localization of endogenous morphine-like compounds in the mouse spinal cord

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Abstract

Morphine, codeine, morphine-6-glucuronide, and morphine-3-glucuronide are synthesized de novo in mammalian cells and in the central nervous system. Knowledge on endogenous morphine-like compound distribution in the adult mouse brain has been recently improved, and new hypotheses have been suggested about the potential implications in brain physiology. Endogenous morphine-like compounds have been shown to be synthesized in the spinal cord, but their localization is unknown. Here we describe the distribution of endogenous morphine-like compounds (morphine and/or its glucuronides and/or codeine) in the adult mouse spinal cord using a well-validated antibody. By using different microscopy approaches, we found the presence of morphine, codeine, or morphine glucuronides in γ-aminobutyric acid (GABA)-ergic neurons and astrocytes of the spinal cord. Whereas GABAergic neurons containing endogenous morphine-like compounds were located primarily in the ventral horn, astrocytes that were labeled for morphine-like compounds were found throughout the gray matter and the white matter. Our study demonstrates the possibility that endogenous morphine-like compounds in the central nervous system have other functions beyond their analgesic functions.
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Dates and versions

inserm-03543844 , version 1 (26-01-2022)

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Alexis Laux, François Delalande, Jinane Mouheiche, Denise Stuber, Alain van Dorsselaer, et al.. Localization of endogenous morphine-like compounds in the mouse spinal cord. Journal of Comparative Neurology, 2012, 520 (7), pp.1547-1561. ⟨10.1002/cne.22811⟩. ⟨inserm-03543844⟩
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