Abstract
[3H]-l-glutamate binding site distribution corresponding to metabotropic receptors was studied by autoradiography during normal and altered cerebellar ontogeny in mice treated on postnatal days (PND) 5 and 6 with the antimitotic methylazoxy-methanol (MAM). Quisqualate (QA)-induced and (2S, 3S, 4S)-α-(carboxycyclopropyl)-glycine (L-CCG-I)-induced [3H]-l-glutamate binding inhibition allowed us to distinguish between group I and group II metabotropic receptor binding sites. In control cerebellar cortex, the QA-sensitive binding site density increases during development, while the L-CCG-I-sensitive binding site density decreases. In the deep cerebellar nuclei (DCN), both populations of binding sites decrease during ontogeny. The antimitotic treatment induces: (1) a slight but significant increase in the QA-sensitive binding sites in the DCN at PND 10 and in the cerebellar cortex beginning from PND 20; (2) a retarded decrease in the L-CCG-I-sensitive metabotropic receptor binding site density. These differences could be due to a retarded cell maturation and/or an over-expression of some postsynaptic receptors in the adult cerebellum in response to the afference deficiency.
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Becker, T., Gombos, G. & de Barry, J. Differential ontogenic pattern of metabotropic [3H]-l-glutamate receptors in normal and granule cell-deficient mouse cerebellum. Exp Brain Res 107, 361–366 (1996). https://doi.org/10.1007/BF00230418
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DOI: https://doi.org/10.1007/BF00230418