a1_Proteinase-activated receptor-2 (PAR-2) is a ubiquitous surface molecule participating in many biological processes. It belongs to the family of G protein-coupled receptors activated by the site-specific proteolysis of trypsin and similar proteases. Altered function of PAR-2 has been described in different malignant tumors. In the present study, we investigated the expression of PAR-2 in breast cancer surgical specimens and the role of trypsin in breast cancer cell line MDA MB-231 proliferation and metabolism. A total of 40 surgical samples of infiltrative ductal breast cancer and breast cancer cell line were included in this study. We analyzed PAR-2 expression by immunohistochemistry, RT-PCR and western blot. Activation of PAR-2 on cell line MDA MB-231 was measured using calcium mobilization assay determined by flow cytometry. MTT cell metabolism assay and cell count analysis were used to assess the trypsin influence on breast cancer cell line MDA MB-231 proliferation. Immunohistochemical examination showed the expression of PAR-2 in all samples of breast cancer surgical specimens and high levels of cell lines which was confirmed by RT-PCR and western blot., a2_Calcium mobilization assay corroborated the activation of PAR-2 on cell line MDA MB-231 either by trypsin or by an agonistic peptide. Cell metabolism assay and cell count analysis showed significant differences of proliferative activity of breast cancer cells dependent on the presence or absence of trypsin and serum in the culture medium. PAR-2 is expressed by high levels in infiltrative ductal breast cancer tissue specimens. PAR-2 is also strongly expressed in studied breast cancer cell lines. PAR-2 is activated by trypsin and also by agonistic peptide in the model of breast cancer cell line MDA MB-231. Activation of PAR-2 in vitro influences proliferative and metabolic activity of breast cancer cell line MDA MB-231. The action of trypsin is modified by the presence of serum which is a potential source of protease inhibitors., R. Matěj, P. Manďáková, I. Netíková, P. Poučková, T. Olejár., and Obsahuje biblografii a bibliografické odkazy
Bolest u onkologicky nemocných je závažným a kvalitu života zhoršujícím symptomem, který vyžaduje zájem lékařů a ošetřovatelského personálu. Velmi problematickým typem bolesti pro její obtížnou lokalizaci a definici je bolest viscerální. Problematika tohoto typu bolesti je nastíněna v přehledném sdělení včetně strategie její léčby., Cancer pain is a serious and quality of life deteriorating quality of life symptom requiring the interest of doctors and nursing staff. Visceral pain is a very complicated type of pain for its difficult localization and definition. Problems of this type of pain is briefly outlined in a clear communication strategy, including its treatment., Ladislav Slováček, and Literatura 19