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2 Acta Neurobiologiae Experimentalis

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Postnatal development of the rat striatum - a study using in situ DNA end labeling technique

100%

Maciejewska B. , Lipowska M. , Kowianski P. , Domaradzka-Pytel B. , Morys J.

nr 1

23-28

We have examined the development of rat striatum for evidence of cells dying in the process of physiological cell death. In present study we have indicated apoptotic cells in sections stained with cresyl violet (cell death characterized by pyknosis) or with DNA end labeling assay (TUNEL method). Our results demonstrated that cell loss during maturation of the rat striatum had the characteristics of apoptosis rather than necrosis. The greatest number of TUNEL - positive and pyknotic cells in the striatum were found during the first postnatal days; after 7th day of postnatal life a rapid decrease of its number was observed. After the second postnatal week no TUNEL-positive cells were observed in the striatum. Our analysis suggests that apoptotic cell death occurring during the development of striatal neuronal population takes place during the first week of postnatal life.

Analysis of calcium binding protein immunoreactivity in the claustrum and the endopiriform nucleus of the rabbit

86%

Wojcik S. , Dziewiatkowski J. , Spodnik E. , Ludkiewicz B. , Domaradzka-Pytel B. , Kowianski P. , Morys J.

nr 4

449-460

The present paper describes parvalbumin, calbindin-D28k and calretinin immunoreactivity in the claustrum and endopiriform nucleus of adult rabbits. Studied neuronal populations are characterized by morphological heterogeneity. Four types were identified in each subpopulation of cells containing calcium binding proteins on the basis of the number of processes and their branching pattern. There were no spatial differences in the distribution of cells containing either parvalbumin or calbindin-D28k in the claustrum and endopiriform nucleus. Well documented presence of the various projective zones in the rabbit claustrum did not reflect the specific distribution of neurons containing calcium binding proteins, except those containing calretinin. Their localization may correspond with the limbic zone. We have found that the rabbit claustrum and endopiriform nucleus have different pattern of parvalbumin and calretinin immunoreactivity. The former was more intense in the claustrum and the distribution of cell types was significantly different from that in the endopiriform nucleus. Calretinin-positive cells were observed in the claustrum, while in the endopiriform nucleus they were scarce. The distribution of neither calbindin-D28k-ir neurons nor fibers allowed differentiation of claustrum and endopiriform nucleus. Significant differences between the claustrum and endopiriform nucleus observed in the rabbit might be related with ontogenetic as well as other (functional) factors.