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Developmental expression of the oligodendrocyte myelin glycoprotein in the mouse telencephalon

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The oligodendrocyte myelin glycoprotein is a glycosylphosphatidylinositol-anchored protein expressed by neurons and oligodendrocytes in the CNS. Attempts have been made to identify the functions of the myelin-associated inhibitory proteins (MAIPs) after axonal lesion or in neurodegeneration. However, the developmental roles of some of these proteins and their receptors remain elusive. Recent studies indicate that NgR1 and the recently discovered receptor PirB restrict cortical synaptic plasticity. However, the putative factors that trigger these effects are unknown. Since Nogo-A is mostly associated with the endoplasmic reticulum and MAG appears late during development, the putative participation of OMgp should be considered. Here we examine the pattern of development of OMgp immunoreactive elements during mouse telencephalic development. OMgp immunoreactivity in the developing cortex follows the establishment of the thalamo-cortical barrel-field. At cellular level, we located OMgp neuronal membranes in dendrites and axons as well as in brain synaptosome fractions and axon varicosities. Lastly, the analysis of the barrel-field in OMgp-deficient mice revealed that although thalamo-cortical connections were formed, their targeting in layer IV was altered and numerous axons ectopically invaded layer II-III. Our data support the idea that early-expressed MAIPs play an active role during development and point to OMgp participating in thalamo-cortical connections.

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Articles publicats en revistes (Biologia Cel·lular, Fisiologia i Immunologia)

# metadata.dc.title[].value
Developmental expression of the oligodendrocyte myelin glycoprotein in the mouse telencephalon