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1

Experimental hymenolepiasis of rats: preliminary data on histopathological changes of visceral organs

100%
Movsesyan S. O., Jivanyan K. A., Chubaryan F. A., Malczewski A., Terenina N. B., Petrossyan R., Ter-Oganyan K. S.
Acta Parasitologica
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2008
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tom 53
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nr 2
Pathomorphological changes of intestine, liver, spleen and adrenals of rats experimentally infected with Hymenolepis diminuta are described 24 days post infection. Major structural alterations in intestinal wall include lesions of the mucosa, fusions of villi, damage of the epithelial layer and its replacement by flattened cells with pycnotic nuclei. In addition, tunica muscularis and tunica submucosa become thicker and there are numerous lymphocytes among enterocytes. At moderate infections, the changes in the spleen indicate activation of the lymphopoiesis and enhanced protective functions while, in heavily infected rats, the B zone of the spleen showed signs of emaciation. Liver histology of infected rats showed dilatation of sinusoids and the presence of destructive alterations in the parenchyma, necrotic cells and cells with pycnotic nuclei; in heavily infected animals, the necrotic cells were grouped in foci. In adrenal glands, alterations concern mostly zona fascicularis, which is interpreted as mobilization of cytoplasmic lipid inclusions in order to increase the intensity of the steroid hormone synthesis. The degree and character of histopathological changes depended on the intensity of infection.
2

Detection and differentiation of waterfowl parvoviruses by PCR

80%
Wozniakowski G., Kozdrun W., Samorek-Salamonowicz E.
Bulletin of the Veterinary Institute in Puławy
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2010
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tom 54
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nr 3
The presented study aimed at application of the PCR methods for the detection and differentiation of goose parvovirus (GPV) and Muscovy duck parvovirus (MDPV) in the liver, spleen, and faeces of infected geese and in litter from infected farms. For the improvement of specificity and efficiency of the methods, as well as for overcoming the frequent inhibition of PCR in samples extracted from faeces and litter, the "touchdown" thermal profile with additive of betaine were used. The isolation of the virus in goose embryo fibroblasts was used as a verifying method for GPV and MDPV detection. The presence of the cytopathic effect in infected cell cultures allowed for the detection of the both parvoviruses but not for their differentiation. As a result of this study, PCR methods for the fast detection of GPV and MDPV in field samples of visceral organs and faeces of infected geese and in their litter were developed.
3

Extradermal melanin transfer? Lack of macroscopic spleen melanization in old C57BL-6 mice with de-synchronized hair cycle

80%
Michalczyk D., Popik M., Salwinski A., Plonka P. M.
Acta Biochimica Polonica
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2009
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tom 56
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nr 2
343-353
 In quest of alternate, extradermal path of melanin transfer from skin to the visceral organs, we suggested that some portions of such melanin may be deposited in the spleen, which in young black C57BL/6 mice is often melanized. Here, we confirm these observation using young C57BL/6 female mice (up to 17 weeks) and show that this phenomenon cannot be observed in old animals where the hair cycle is not synchronized any more. The experiments were carried out both on spontaneous and depilation-induced hair cycle. We have checked it as a side-observation over many other experiments carried out on young and old C57BL/6 female mice (up to 2.5 years of life). The presence or absence of melanin in the spleens was checked macroscopically, and histologically by Fontana-Masson (FM) staining, and synchronization of the hair cycle - by standard histomorphometric analysis of the back skin hair follicles. In about 40% of old spleens black FM-stainable "debris" could be found under closer histological examination. This study shows that, at least in part, the phenomenon of splenic melanosis in C57BL/6 mice can be correlated with the synchronized skin melanization parallel to the hair cycle progress, and that splenic melanin undergoes gradual degradation during the mouse life.
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