Metabotropic Glutamate Receptors mGluR1α and mGluR2/3 Display Dynamic Expression Patterns in Developing Rat Striatum

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Abstract
The developmental expression of two metabotropic glutamate receptors (mGluR), mGluR1α and mGluR2/3 was evaluated in the rat striatum from birth to adulthood. The mGluR1α receptor subtype displayed a patchy organization perinatally that became more homogeneous after the first postnatal week. The adult pattern of receptor expression consisted of homogeneous punctate profiles spread throughout the striatum. The mGluR2/3 receptor subtype exhibited a unique pattern of ontogenic expression, being associated exclusively with fibers of the internal capsule that penetrate the striatum, during the perinatal period. The protein localization for this subtype spread into the striatal neuropil after the first postnatal week, in parallel to the development of afferent terminations and arborizations to the nucleus. Unlike the ionotropic GluR subunits that are associated with somata and dendrites, neither subtype of metabotropic receptor was associated with neuronal cell bodies within the striatum.

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