Wyniki wyszukiwania - Biblioteka Nauki

1

The cytoarchitectonic and neuronal structure of the red nucleus in guinea pig: Nissl and Golgi studies

100%

Robak A. , Szteyn S. , Bogus-Nowakowska K. , Doboszynska T. , Rowniak M.

|

nr 4

EN

The present studies were carried out on the brains of adult guinea pigs, DunkinHartley strain. On the basis of preparations, they were stained according to the Nissl and the Klüver-Barrera method’s; a short description of the cytoarchitectonics and the characteristics of the rubral cells were written. The red nucleus (RN) of the guinea pig is 1.2 mm in length. Three cellular parts in RN, and three classes (A, B, C) of the rubral cells were distinguished. Taking into consideration the predominant cell size, RN was divided into magnocellular part (RNm), parvocellular part (RNp) and intermediate part (RNi). On the basis of Golgi impregnated preparations four neuronal types (I, II, III, IV) were distinguished. To sum up, in the guinea pig were observed: the large, mainly multipolar (type I) and bipolar (type II) spiny being coarse (class A) in Nissl material; the medium-sized, triangular, aspiny (type III) corresponding to the fine cells (class B); and the small, both spiny and aspiny neurons (type IV), which are the fine or achromatic cells (classes B or C) in Nissl stained slices. The highest degree of dendritic branching was observed in type I, whereas the lowest in cells of types III and IV.

2

The neuronal structure of the preoptic area in the mole and the rabbit: Golgi and Nissl studies

86%

Bogus-Nowakowska K. , Robak A. , Szteyn S. , Rowniak M. , Najdzion J. , Wasilewska B.

|

nr 4

367-376

EN

The present studies were carried out on the brains of the adult mole and rabbit. The preparations were made by means of the Golgi technique and the Nissl method. Two types of neurons were distinguished in the preoptic area (POA) of both species: bipolar and multipolar. The bipolar neurons have oval, fusiform or round perikarya and two dendritic trunks arising from the opposite poles of the cell body. The dendrites bifurcate once or twice. The dendritic branches have swellings, single spine-like and filiform processes. The multipolar neurons usually have triangular and quadrangular perikarya and from 3 to 5 dendritic trunks. The dendrites of the mole neurons branch sparsely, whereas the dendrites of the rabbit neurons display 2 or 3 divisions. On the dendritic branches varicosities and different protuberances were observed. The general morphology of the bipolar and multipolar neurons is similar in the mammals studied, although the neurons of the rabbit POA display a more complicated structure. Their dendritic branches show more divisions and possess more swellings and different processes than the dendrites of the neurons of the mole POA. Furthermore, of the multipolar neurons only the dendrites in POA of the rabbit were observed to have a rosary-like beaded appearance.

3

Distribution of cocaine- and amphetamine - regulated transcript in the hippocampal formation of the guinea pig and domestic pig

86%

Kolenkiewicz M. , Robak A. , Rowniak M. , Bogus-Nowakowska K. , Calka J. , Majewski M.

|

nr 1

EN

This study provides a detailed description concerning the distribution of cocaineand amphetamine-regulated transcript (CART) subunits — CART₆₁₋₁₀₂ and rhCART₂₈₋₁₁₆ — in the hippocampal formation (HF) of the guinea pig and domestic pig, focussing on the dentate gyrus (DG) and hippocampus proper (HP). Although in both studied species CART-immunoreactive (CART-IR) neuronal somata and processes were present generally in the same layers, some species-specific differences were still found. In the granular layer (GL) of both species, the ovalshaped neurons and some thick varicose fibres were encountered. In the guinea pig there was an immunoreactive “band of dots”, probably representing crosssectioned terminals within the DG molecular layer (MOL), whereas in the domestic pig, some varicose fibres were detected, thus suggesting a different orientation of, at least, some nerve terminals. Furthermore, some CART-positive cells and fibres were observed in the hilus (HL) of the guinea pig, whereas in the analogical part of the domestic pig only nerve terminals were labelled. In both species, in the pyramidal layer (PL) of the hippocampus proper, CART- -IR triangular somata were observed in the CA3 sector, as well as some positive processes in MOL; however, a few immunoreactive perikarya were found only in the CA1 sector of the guinea pig. As regards the localization patterns of two isoforms of CART in the guinea pig, both peptide fragments were present simultaneously in each of the labelled neurons or fibres, whereas in the domestic pig three types of fibres may be distinguished within the area of the DG. In the hilus and MOL of the dentate gyrus, there were fibres expressing both isoforms of CART in their whole length (fibres of the first type). Fibres of the second type (in GL) coexpressed both peptides only on their short segments, and the last ones (in MOL) expressed solely rhCART₂₈₋₁₁₆. These results indicate that the distribution of the two CART isoforms are specifically related, thus the relationship between the two CART isoforms may imply different metabolic profiles of CART-expressing neurons. (Folia Morphol 2009; 68, 1: 23–31)

4

Distribution and chemical coding pattern of somatostatin immunoreactivity in the dorsal striatum of the guinea pig

86%

Wasilewska B. , Robak A. , Rowniak M. , Bogus-Nowakowska K. , Najdzion J. , Zakowski W. , Majewski M.

|

nr 4

5

Distribution and chemical coding pattern of the cocaine- and amphetamine-regulated transcript (CART) immunoreactivity in the preoptic area of the pig

72%

Bogus-Nowakowska K. , Robak A. , Rowniak M. , Wasilewska B. , Najdzion J. , Kolenkiewicz M. , Zakowski W. , Majewski M.

|

nr 4