Abstract
The Lugaro cell is a feedback interneuron of the cerebellar cortex, recognizable by its characteristic morphology. Postnatal neuronal migration to the cortex has been described for several cerebellar interneurons. Since in our previous studies we observed Lugaro-like cells (LCs) in the white matter (WM) and internal granular layer (IGL) of the cerebellum of young cats, we assumed that a proportion of these cells migrate also postnatally to their destination. In the present study using and immunostaining for the metabotropic glutamate receptor mGluR1α and neurofilament protein SMI 311 the number and spatial distribution of LCs at different postnatal days were investigated.
We found that the number and distribution of both mGluR1a-immunoreactive (ir) and of SMI 311-ir LCs changed with age in the developing cerebellar cortex of kittens: developing LCs express mGluR1α already in the newborn, while expression of SMI 311-ir in LCs appears only about a week later. At postnatal day 1 (P1) relatively few mGluR1-ir LCs were detected in the WM and at the border of WM and IGL. Later, their number increased sharply until P15 (6–7 fold) and decreased continuously between P15 and P135. SMI 311-ir LCs were not present at P1 and even at P8 only a few were observed in the WM or in infraganglionic positions. Their number increased gradually (12–14 fold) until adulthood when their number was stabilized at 8.000–10.000/cerebellum. At the same time the number of probably ectopic SMI 311-ir LCs decreased with age: at P22 about one third of them was found in “ectopic” position, whereas in the adult cat only about 10–12% of LCs's was either in the WM or scattered in the whole depth of the granular layer.
These results suggest that: (1) most LCs appear in the cerebellar cortex postnatally; and (2) postnatal migration and incorporation of LCs to the cortex is a much longer process than previously expected, occurring even after the cytoarchitectonic built-up (about P65–P70 in cat) of the cerebellum.
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Víg, J., Takács, J., Vastagh, C. et al. Distribution of mGluR1α and SMI 311 immunoreactive Lugaro cells in the kitten cerebellum. J Neurocytol 32, 217–227 (2003). https://doi.org/10.1023/B:NEUR.0000010081.54613.94
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DOI: https://doi.org/10.1023/B:NEUR.0000010081.54613.94