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   <subfield code="a">Expression von Prolaktin-Rezeptoren im kaninen gesunden Mammagewebe, in kaninen Mammaadenomen und Mammaadenokarzinomen</subfield>
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   <subfield code="a">Mammatumoren gehören zu den häufigsten neoplastischen Erkrankungen der Hündin. Hohe Prolaktinserumspiegel scheinen die kanine Mammatumorgenese zu begünstigen; Daten zur proliferationsfördernden, antiapoptotischen, migratorischen und angiogenetischen Wirkung von Prolaktin stammen vor allem aus in vitro-Studien humaner Brustkrebszellen. Über die Expression des Prolaktinrezeptors, welcher die Wirkung von Prolaktin vermittelt, liegen in der Veterinärmedizin kaum Ergebnisse vor. Zur Untersuchung der Rolle des Prolaktins in der Pathogenese kaniner Mammatumoren wurde die Prolaktinrezeptorexpression in je zehn formalin-fixierten, paraffin-eingebetteten Proben von nicht neoplastischem Gewebe, Adenomen und Adenokarzinomen mittels quantitativer Real Time PCR untersucht. Die höchste Expression wurde in normalem Mammagewebe ermittelt, in Adenomen und deutlicher noch in Adenokarzinomen war die Rezeptorexpression signifikant niedriger. Immunhistochemisch wurde die Expression des Prolaktinrezeptors ebenfalls in allen Gewebstypen, und dabei vorrangig in den epithelialen Zellen nachgewiesen. Die maligne Transformation des Gewebes spiegelte sich somit in einer Reduktion der Prolaktinrezeptorexpression wider. Diese Reduktion könnte Ausdruck eines Differenzierungsverlustes sein, ihre funktionelle Bedeutung ist unklar. Desweiteren stellt sich die Frage, inwieweit die Prolaktinwirkung an die Prolaktinrezeptorexpression gebunden ist. Diese Fragen sind Gegenstand zukünftiger Untersuchungen.   Mammary tumors are among the most common neoplastic diseases of the female dog. High serum levels of Prolactin seem to promote tumorigenesis of canine mammary tumors; Data concerning the proliferative, anti-apoptotic, migratory and angiogenetic effects of Prolactin have mainly been obtained by in-vitro-studies of human breast cancer cells. In veterinary medicine, little information is available about the expression of the prolactin receptor, which mediates the effects of Prolactin. To investigate the role of Prolactin in the pathogenesis of canine mammary tumors, Prolactin receptor expression was examined by quantitative real-time PCR on 10 formalin-fixed, paraffin-embedded samples of canine normal mammary tissue, adenoma and adenocarcinoma, respectively. Highest expression levels were found in normal mammary tissue, while adenomas, and to even higher degree adenocarcinoma, showed a significant decrease in Prolactin receptor expression. By immunohistochemistry, Prolactin receptor expression was demonstrated in each of the tissue types as well, predominantly in epithelial cells. Thus, malignant transformation of mammary tissue was associated with a decline in Prolactin receptor expression. This decline might represent a loss of differentiation, with its function not yet being understood. Furthermore, the effect of Prolactin might not necessarily be correlated with a high receptor expression rate. These questions have to be further investigated in future studies.</subfield>
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