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1

Reactivity of astrocytes in the periaqueductal gray matter of rats treated with monosodium glutamate

100%
Krawczyk A., Jaworska-Adamu J.
Folia Histochemica et Cytobiologica
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2020
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tom 58
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nr 2
2

Correlation between dopaminergic phenotype and expression of calretinin in the midbrain nuclei of the opossum (Monodelphis domestica): An immunohistological study

80%
Klejbor I., Ludkiewicz B., Wojcik S., Turlejski K.
Acta Neurobiologiae Experimentalis
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2013
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tom 73
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nr 4
We investigated distribution and morphology of neurons of the midbrain nuclei: the ventral tegmental area (VTA), substantia nigra (SN) and periaqueductal gray (PAG) of the adult grey short-tailed opossums that were double immunolabeled for the presence of calretinin (CR) and/or tyrosine hydroxylase (TH). The majority of TH-immunopositive neurons and fibers were located in the VTA, SN, and only scarce population of small neurons expressing TH was present in the PAG. In the SN 80% of TH-expressing neurons had large cell bodies, and only a small fraction had small perikarya. In the PAG populations of large and medium sized neurons were equal and 20% of neurons had small perikarya. Much scarcer population of TH-immunoreactive neurons in the PAG consisted of large or small neurons in its dorsal part (PAGd) and almost exclusively small neurons in the ventral part (PAGv). Distribution of neurons expressing TH and their types in the opossum are similar to those in rodents. The majority of CR-immunolabeled neurons were found in the VTA. In its subdivision, the parabrachal pigmented nucleus (PBP) cells expressing CR were approximately 28% more numerous than cells expressing TH. In spite of that, only 42% of TH-expressing neurons coexpressed CR. The high degree of colocalization TH and CR was observed in the SN. We propose that a higher percentage of TH/CR colocalization, which is observed in the opossums SN, may give them the ability to adapt to changes in their motor functions.
3

Ligula intestinalis [Cestoda] infections of roach [Rutilus rutilus] [Cyprinidae]: immunocytochemical investigations into the salmon- and chicken-II type gonadotrophin-releasing hormone [GnRH] systems in host brains

70%
Williams M. A., Penlington M. C., King J. A., Hoole D., Arme C.
Acta Parasitologica
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1998
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tom 43
|
nr 4
The tapeworm Ligula intestinalis interferes with the pituitary-gonadal axis of its fish host so that parasitised fish are unable to reproduce. To investigate how this effect may be brought about, antibodies against salmon- and chicken-II type gonadotrophin-releasing hormones (sGnRH and cGnRH-II, respectively) have been used in an immunocytochemical investigation of the brain of roach, Rutilas rutilus. Brains were removed, without the pituitary gland, from fish obtained from the wild during the period from February to April, prior to spawning. The sGnRH-positive neuronal system comprised cell bodies and fibres located in the forebrain and midbrain areas. The cGnRH-II-positive neuronal system comprised cell bodies, tracts and fibres mainly located in the posterior hypothalamic lobes and medulla. Salmon-type GnRH-positive cell bodies were demonstrated in the midbrain tegmentum. In the forebrain, the olfactory lobes contained only a few short fibres immunoreactive for sGnRH whilst the floor of the ventral telencephalon was highly reactive for sGnRH. Long tracts of cGnRH-II-positive fibres were observed to course laterally within the hypothalamic lobes, whilst cGnRH-II-positive fibres originating in the medulla formed a continuous channel coursing to the spinal chord. GnRH-positive cells were not observed in the preoptic area using anti-sGnRH or anti-cGnRH-II antibodies. The presence of the tapeworm Ligula intestinalis had no discernible effect on the GnRH-positive cells or fibres. The interaction of L. intestinalis with the pituitary-gonadal system of the fish host is discussed.
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