Background S100A1 expression is deregulated in a variety of human malignancies, but its role in normal and malignant endometrial cells is unclear. Methods We used endometrial carcinoma (Em Ca) cell lines to evaluate the physical and functional interaction of S100A1 with p53 and its negative regulator, mouse double minute 2 (MDM2). We also evaluated the expression of S100A1, p53, and MDM2 in clinical samples consisting of 89 normal endometrial and 189 Em Ca tissues. Results S100A1 interacted with MDM2 but not p53 in Em Ca cell lines. Treatment of cells stably overexpressing S100A1 with Nutlin-3A, an inhibitor of the p53/MDM2 interaction, increased expression of p53-target genes including p21waf1 and BAX. S100A1 overexpression enhanced cellular migration, but also sensitized cells to the antiproliferative and proapoptotic effects of Adriamycin, a genotoxic agent; these phenotypes were abrogated when S100A1 was knocked down using shRNA. In clinical samples from normal endometrium, S100A1 expression was significantly higher in endometrial glandular cells of the middle/late secretory and menstrual stages when compared to cells in the proliferative phases; high S100A1 was also positively correlated with expression of MDM2 and p21waf1 and apoptotic status, and inversely correlated with Ki-67 scores. However, such correlations were absent in Em Ca tissues. Conclusion The interaction between S100A1 and MDM2 may modulate proliferation, susceptibility to apoptosis, and migration through alterations in p53 signaling in normal- but not malignant-endometrial cells.
There are many reports on the development of Babesia species in the host and the vector ticks [1,2 ,9 ,11,15]. However, no detailed observations on the developmental stages of Babesia ovata [12] in Haemaphysalis longicornis have been made yet. Babesia species are known to undergo morphological change during the growth in the host and the vector ticks. The present was carried out to study the growth of B. ovata in periphelal blood of host cattle, in the midgut, haemolymph and eggs of the tick, H. longicornis.
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