Abstract
AbstractThe distributions of neurons displaying immunoreactivity for two calcium binding proteins, parvalbumin and 28Kd calbindin, were studied in the thalamus of M. fascicularis. Colocalization experiments were carried out to determine the extent to which parvalbumin‐ and calbindin‐like immunoreactivity was found in the same cells and the extent to which either was localized in GABAergic interneurons. Anterograde and retrograde tracing experiments involving the fluorescent tracer, fast blue, were also used to determine that cells expressing the calcium binding proteins projected upon the cerebral cortex.In the dorsal thalamus, nuclei are distinguished by different patterns of parvalbumin‐like and calbindin‐like immunoreactivity. In certain nuclei, for example the lateral dorsal and anterior pulvinar, neurons express immunoreactivity for only one of the calcium binding proteins. In others, neurons in different layers, for example the dorsal lateral geniculate nucleus, or in different compartments, for example the intralaminar nuclei, express immunoreactivity for either parvalbumin or calbindin; in other nuclei, for example the ventral group, neurons are mixed and immunoreactivity for parvalbumin and calbindin is commonly colocalized. In the ventral thalamus and epithalamus, similar patterns are observed.Colocalization of parvalbumin‐ and GABA‐immunoreactivity is found in all cells of the reticular nucleus but only in certain cells in selected nuclei of the dorsal thalamus, namely the dorsal lateral geniculate and magnocellular medial geniculate. No calbindin‐positive cells are also GABA‐positive.Most parvalbumin and/or calbindin positive cells in the dorsal thalamus project to the cerebral cortex, as indicated by the retrograde tracing studies, and many parvalbumin positive fibres entering the cerebral cortex could also be shown to contain fast blue anterogradely transported from a thalamic injection.Most of the major sensory and motor pathways entering the dorsal thalamus express parvalbumin immunoreactivity. The optic tract also expresses calbindin immunoreactivity but most other calbindin positive fibres entering the thalamus ascend in the midbrain tegmentum.The differential distributions of parvalbumin and calbindin implied by these results suggest that thalamic cells belonging to different functional systems and projecting differentially upon the cerebral cortex can be distinguished by differential expression of these or closely related calcium binding proteins. This may yield clues to their differential responsivity to afferent driving.
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Dates
Type | When |
---|---|
Created | 19 years, 4 months ago (April 7, 2006, 7:56 p.m.) |
Deposited | 1 year, 10 months ago (Oct. 22, 2023, 12:39 a.m.) |
Indexed | 1 week, 5 days ago (Aug. 23, 2025, 9:26 p.m.) |
Issued | 36 years, 4 months ago (May 1, 1989) |
Published | 36 years, 4 months ago (May 1, 1989) |
Published Online | 19 years, 4 months ago (April 7, 2006) |
Published Print | 36 years, 4 months ago (May 1, 1989) |
@article{Jones_1989, title={Differential Calcium Binding Protein Immunoreactivity Distinguishes Classes of Relay Neurons in Monkey Thalamic Nuclei}, volume={1}, ISSN={1460-9568}, url={http://dx.doi.org/10.1111/j.1460-9568.1989.tb00791.x}, DOI={10.1111/j.1460-9568.1989.tb00791.x}, number={3}, journal={European Journal of Neuroscience}, publisher={Wiley}, author={Jones, E. G. and Hendry, S. H. C.}, year={1989}, month=may, pages={222–246} }