PMID: 9165354May 1, 1997Paper

Differences between guinea pig and rat in the dorsal cochlear nucleus: expression of calcium-binding proteins by cartwheel and Purkinje-like cells

Hearing Research
W B Spatz

Abstract

This study describes differences between guinea pig and rat in the immunoreactivities for calbindin (CB-IR) and parvalbumin (PV-IR) in cartwheel (CWC) and Purkinje-like (PLC) cells of the dorsal cochlear nucleus (DCN). CWCs are the most important inhibitory interneurons of the DCN. Their soma and dendrites stain intensely for CB-IR in guinea pigs but only weakly and incompletely in rats. In both species, the CWCs do not show PV-IR. PLCs, a rare type of DCN cells often interpreted as displaced cerebellar Purkinje cells misrouted during migration, are known from rat and mouse and are here described for guinea pig DCN. PLCs are intensely and completely stained for CB-IR and PV-IR in guinea pigs. In rats, they stain with similar completeness only for CB-IR, PV-IR being weak and restricted to the cell's soma. Similar staining differences between the two species are seen with the cerebellar Purkinje cells, i.e., PLCs resemble the cerebellar Purkinje cells more than do the CWCs. Based on the present material (and preliminary findings in a primate (marmoset), we speculate that the PLCs have their place in the circuitry of the DCN receiving input via parallel fibers, like the CWCs, and possibly projecting their axon onto the cerebellum.

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Citations

Apr 3, 2009·Experimental Brain Research·Michaela FredrichRobert-Benjamin Illing
Aug 30, 2008·Zhurnal evoliutsionnoĭ biokhimii i fiziologii·M G BelekhovaE I Kreasnoshchekova
Apr 20, 2012·Brain Research·Joan S BaizerRichard J Salvi
Aug 19, 2014·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Joan S BaizerPatrick R Hof
Dec 20, 2002·Acta Physiologica Hungarica·G Szucs, Z Rusznák

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