miRNA profile of luminal breast cancer subtyptes in Slovak women.

OBJECTIVE: Aberrant expression of short, non-coding RNA molecules (miRNA) leads to breast cancer initiation, progression and metastasing. The miRNA expression level associates with imunohistochemical profile, histopathological parameters, clinical outcomes, prognoses and therapeutical response. The aim of this study was to analyse the whole spectrum of miRNA by microarray method and to define relevant miRNAs describing biological characteristics of luminal breast cancer subtypes. DESIGN: Cross-sectional study, basic research. SETTING: Biomedical center Martin, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia. METHODS: We analysed 16 tissue samples of Luminal A/B breast cancer types and 16 breast tissue samples without pathological findings. The microarray technology by Agilent was used to analyse 2549 miRNAs by SurePrint G3 Human miRNA kit v.21. The results were assessed by AgiMicroRNA Bioconductor library within Limma pack. RESULTS: The analyses of the lowest FDR p-value and the highest logFC value selected the oncomiR miR-182 as the most dominant with higher expression in cancer tissues than in normal tissues, followed by miR-21, miR342-3p/5p and miR-6826. The miR-4324 and cluster of miR-99a/let7c/miR-125b dominated in the group of miRNAs with lower expression in cancer tissues compared to normal tissues. CONCLUSION: The first results of this study complement biological characteristics of luminal breast cancer subptypes, represent basis for follow-up projects focused on the clarification of relevant signaling pathways and promise new and innovative breast cancer treatment based on the precise, tailored therapy by targeting specific miRNAs involved in the most important carcinogenesis mechanisms.

Potential of survivin for treatment of gynaecological tumour diseases.

OBJECTIVE: The main purpose of this article is to consolidate known facts about survivin, its contribution to inhibition of apoptosis, impact to tumorigenesis of gynaecological types of tumours. and possibilities of inhibition of survivin on molecular-genetic levels. DESIGN: A review article. SETTINGS: Division of Molecular Medicine, Biomedical Center in Martin, JLF UK Martin, Slovakia; Department of Gynaecology and Obstetrics JLF UK and UNM Martin, Slovakia; Division of Oncology, Biomedical Center, JLF UK Martin, Slovakia. METHODS: An analysis of the literature using database search engines focused on aberations in fuction of survivin, primarily in case of gynaecological tumours and possibilities of its inhibition. RESULTS AND CONCLUSIONS: Survivin is the smallest member of inhibitor of apoptosis (IAP) family. Despite of its size and affiliation to mentioned gene family, survivin can affect besides inhibition of apoptosis also proper process of mitosis, DNA reparation and angiogenesis. High levels of survivin expression are typical for fetal tissues during intrauterine developement. In healthy, adult tissues remain levels of survivin very low. Nonetheless, abundant expression of survivin is in many cases typical for various types of cancer, including gynaecologycal cancers Generally, it is possible to associate higher amounts of survivin with poor prognosis and resistance to chemo- or radiotherapy.

Factors affecting the uterine sarcomas developement and possibilities of their clinical diagnosis.

OBJECTIVE: The main goal of this article is to summarize the known factors underlying the tumorigenesis of sarcomas and to present the limitations of clinical diagnosis. DESIGN: A review article. SETTINGS: Division of Molecular Medicine, Biomedical Center, JLF UK Martin, Slovakia; Department of Gynaecology and Obstetrics JLF UK and UNM Martin, Slovakia; Division of Oncology, Biomedical Center in Martin, JLF UK, Martin, Slovakia. METHODS: An analysis and summarisation of published studies about etiology, aberrant factors and limmitations of clinical diagnosis of uterne sarcomas. RESULTS AND CONCLUSIONS: Uterine sarcomas are heterogenous, malignant tumour types of mesenchymal origin with a very low incidence. On the other hand, sarcomas are very aggressive tumours with a poor prognosis, and a very low chance of surviving in general. The most common types of sarcomas are leiomyosarcomas, followed in percentage occurrence by endometrial stromal sarcomas and adenosarcomas. This tumour pathogenesis remains still relatively unknown. There are recognized only several predisposition factor types, and the limitated molecular-genetic aberrations associated with their occurrence. Importantly, the potential perturbation of the malignant mass during the implementation of invasive methods can be considered as the most serious risk factor. In regards to the visualization methods application, there are still limited ways of distinguishing between malignant and benign forms, especially in the case of leiomyosarcomas.

Adsorption of cadmium(II) on waste biomaterial.

Significant increase of the adsorption ability of the eggshell biomaterial toward cadmium was observed upon milling, as is evidenced by the value of maximum monolayer adsorption capacity of 329mgg(-1), which is markedly higher than in the case of most "green" sorbents. The main driving force of the adsorption was proven to be the presence of aragonite phase as a consequence of phase transformation from calcite occurring during milling. Cadmium is adsorbed in a non-reversible way, as documented by different techniques (desorption tests, XRD and EDX measurements). The optimum pH for cadmium adsorption was 7. The adsorption process was accompanied by the increase of the value of specific surface area. The course of adsorption has been described by Langmuir, Freundlich and Dubinin-Radushkevich isotherms. The adsorption kinetics was evaluated using three models, among which the best correlation coefficients and the best normalized standard deviation values were achieved for the pseudo-second order model and the intraparticle diffusion model, respectively.

Association of metabolic and genetic factors with cholesterol esterification rate in HDL plasma and atherogenic index of plasma in a 40 years old Slovak population.

We assessed association between novel biomarkers of cardiovascular disease and conventional factors in 40 years old subjects (208 men and 266 women) from the general population of Slovakia. FER(HDL) (cholesterol esterification rate in HDL plasma), AIP--Atherogenic Index of Plasma [Log(TG/HDL-C)] as markers of lipoprotein particle size, and CILP2, FTO and MLXIPL polymorphisms, were examined in relation to biomarkers and conventional risk factors. Univariate analyses confirmed correlation between AIP, FER(HDL) and the most of measured parameters. Relations between AIP and CILP2, FTO and MLXIPL were not significant. However, CILP2 was significantly related to FER(HDL) in both genders. In multivariate analysis BMI was the strongest correlate of AIP levels. In multivariate model variability of FER(HDL) was best explained by AIP (R(2) = 0.55) in both genders with still significant effect of CILP2 SNP in men. In a model where AIP was omitted, TG levels explained 43 % of the FER(HDL) variability in men, while in women HDL-C was the major determinant (42 %). In conclusions, FER(HDL) and AIP related to the known markers of cardiovascular risk provide means to express their subtle interactions by one number. Our novel finding of association between CILP2 polymorphism and FER(HDL) supports its role in lipid metabolism.