Activated hepatic stellate cells (HSC) are a major source offibrous proteins in cirrhotic liver. Inducing or accelerating their apoptosis is a potential way of liver fibrosis treatment. Extracellular matrix (ECM) surrounding cells in tissue affects their differentiation, migration, proliferation and function. Type I collagen is the main ECM component in fibrotic liver. We have examined how this protein modifies apoptosis of normal rat HSC induced by gliotoxin, cycloheximide and cytochalasin D in vitro and spontaneous apoptosis of HSC isolated from CCl4-damaged liver. We have found that type I collagen gel enhances HSC apoptosis regardless of the agent triggering this process. and L. Bittnerová, A. Jiroutová, E. Rudolf, M. Rezácová, J. Kanta
Nádorová tkáňová banka obsahující kryokonzerované vzorky nádorových tkání umožňuje rozvoj nových diagnostických postupů založených na metodách molekulárně-biologických a genetických analýz. Naše studie byla zahájena v červnu 2008. Prezentované výsledky představují období pěti let (follow up). Celkový počet nemocných žen s karcinomem prsu, které byly zařazeny do projektu, byl 233 pacientek, průměrný věk 65,2 roku (věkový rozdíl 27–88 let). V naší studii byly odebrány a kryokonzervovány vzorky od 156 nemocných žen. Cílem naší studie je vytvořit program evidence a hodnocení prediktivních a prognostických faktorů analyzovaných novými molekulárně-biologickými a genetickými metodami. Využívání nových technologických postupů v léčbě nádorových onemocnění jako jsou např. biotechnologie a nanotechnologie, vyžadující hledání „nových“ prediktivních a prognostických faktorů, které budou vhodně doplňovat výběr léčby., The Tumor Tissue Bank containing cryopreserved samples unables development of new diagnostic methods based on molecular biologic and genetic analyses. Our study started in June 2008. In our study were taken and samples from 156 female patients. The results reported here represent the 3-year period of follow up. 316 women with breast carcinoma, mean age 65.2 years (age range 27 to 88 years) were admitted to this project. The aim of our study was to design a program of record-keeping and assessment of predictive and prognostic factors obtained with new molecular biologic and genetic methods. Utilization of new technologies in the treatment of cancer such as biotechnology and nanotechnology demand searching of „new“ predictive and prognostic factors that will suitably supplement the choice of therapy., Alžběta Filipová, Zuzana Mačingová, Pavel Jandík, Pavel Měřička, Martina Řezáčová, Stanislav Filip, and Literatura
In this paper we describe the influence of NU7026, a specific inhibitor of DNA -dependent protein kinase, phosphoinositide 3-kinase, and AT M-kinase on molecular and cellular mechanisms triggered by ionising irradiation in human T-lymphocyte leukaemic MOLT -4 cells. We studied the effect of this inhibitor (10 μM) combined with gammaradiation (1 Gy) leading to DNA damage response and induction of apoptosis. We used methods for apoptosis assessment (cell viability count and flow-cytometric analysis) and cell cycle analysis (DNA content measurement) and we detected expression and post-translational modifications (Western blotting) of proteins involved in DNA repair signalling pathways. Pre-treatment with NU7026 resulted into decreased activation of checkpoint kinase-2 (Thr68), p53 (Ser15 and Ser392), and histone H2A.X (Ser139) 2 hours after irradiation. Subsequently, combination of radiation and inhibitor led to decreased amount of cells in G2-phase arrest and into increased apoptosis after 72 hours. Our results indicate that in leukaemic cells the pre-incubation with inhibitor NU7026 followed by low doses of ionising radiation results in radio-sensitising of MOLT -4 cells via diminished DNA repair and delayed but pronounced apoptosis. This novel approach might offer new strategies in combined treatment of leukaemia diseases., Aleš Tichý, Eva Novotná, Kamila Ďurišová, Barbora Šalovská, Radka Sedlaříková, Jaroslav Pejchal, Lenka Zárybnická, Jiřina Vávrová, Zuzana Šinkorová, Martina Řezáčová, and Literatura 42