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Nacher, J. et al.

Nacher, Soriano, Varea, Molowny, Ponsoda, Lopez-Garcia,

CRMP-4 expression in the adult cerebral cortex and other telencephalic areas of the lizard Podarcis hispanica.

The control of neuritogenesis is crucial for the development, maturation and regeneration of the nervous system. The collapsin response-mediated protein 4 (CRMP-4) is a member of a family of proteins that are involved in neuronal differentiation and axonal outgrowth. In rodents, this protein is expressed in recently generated neurons such as some granule neurons of the dentate gyrus, as well as in certain differentiated neurons undergoing neurite outgrowth or synaptogenesis during adulthood. Since CRMP-4 protein appears to be highly conserved throughout the evolutionary scale, we have used immunocytochemistry to study its distribution in the lizard cerebral cortex. We have found pronounced CRMP-4 immunolabeling in certain neurons of the medial cortex, the homologous region to the dentate gyrus, but also in the dorsal and lateral cortices. Double labeling with 5'-BrdU indicated that these medial cortex neurons were recently generated. However, it is also possible that many of these cells were not new but undergoing some kind of plasticity implicating neurite outgrowth. Similar CRMP-4-labeled neurons and processes were observed in subcortical regions as the PDVR and the nucleus sphericus. Our results show for the first time the expression of CRMP-4 in a reptile brain, where it appears to be expressed in regions where adult neurogenesis and/or neurite outgrowth occur.[1]

References

CRMP-4 expression in the adult cerebral cortex and other telencephalic areas of the lizard Podarcis hispanica. Nacher, J., Soriano, S., Varea, E., Molowny, A., Ponsoda, X., Lopez-Garcia, C. Brain Res. Dev. Brain Res. (2002) [Pubmed]

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