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Wyszukujesz frazę "radiosensitivity" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
The influence of fractionated radiation on proliferation, cell cycle and apoptosis of normal human dermal fibroblasts
Autorzy:
Adamczyk, A.
Gasińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/147800.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
fibroblasts
fractionated irradiation
proliferation
radiosensitivity
Opis:
The aim of the study was to investigate the changes in proliferation rate, cell cycle and apoptosis of normal skin fibroblasts during fractionated irradiation with a fraction dose of 2 Gy. Fibroblasts were irradiated 5 days per week for 12 days using gamma irradiation. Twenty four hours after each fraction, and for three days after finishing experiment the cells were harvested, fixed, and BrdUrd labelling index (BrdUrdLI), cell cycle and level of apoptosis and debris were assessed. It was found that fractionated irradiation caused disturbances in the proliferation rate and the cell cycle. Irradiation caused also constant, statistically significant increase in the number of G2M cells and level of apoptosis and debris, which was observed even during 3 days after irradiation. Data indicate non equal biological effect of each fraction dose. Block at G2/M phase suggests accumulation of sublethal damage and increased radiosensitivity, which was manifested by elevated level of cell death (apoptosis and debris).
Źródło:
Nukleonika; 2005, 50,suppl.2; 9-12
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global quantification of heterochromatin-associated histone methylations in cell lines with differential sensitivity to ionizing radiation
Autorzy:
Cetinkaya, Merve
Özgür, Emre
Dalay, Nejat
Gezer, Ugur
Powiązania:
https://bibliotekanauki.pl/articles/1039084.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
histone methylation
heterochromatin
radiosensitivity
ELISA immunoassay
Opis:
Histone modifications are involved in the DNA damage response (DDR). Here, by utilizing an ELISA immunoassay we assessed the methylation at H3K9 (H3K9me2 and H3K9me3) in two cell lines with differential sensitivity to radiation-induced apoptosis, HeLa (sensitive) and MCF-7 (resistant). We found that DNA damage induction by γ-irradiation leads to considerable accumulation (up to 5-fold) of H3K9me2 and H3K9me3, but not of H4K20me3 (control modification) in MCF-7 cells (p<0.05). Interestingly, a lower dose (2 Gy) was more effective than 5 Gy. In HeLa cells a smaller effect (approx. 1.5-1.8-fold) was evident only at 5 Gy. In conclusion, our findings reveal that DNA damage leads to specific accumulation of H3K9me2 and H3K9me3 in a cell-type specific manner.
Źródło:
Acta Biochimica Polonica; 2015, 62, 2; 173-176
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genotoxic effects of 60Co gamma-rays on Chinese hamster ovary (CHO) cells
Autorzy:
Dicu, T.
Brie, I.
Virag, P.
Fischer, E.
Perde, M.
Foriş, V.
Cernea, V.
Cosma, C.
Powiązania:
https://bibliotekanauki.pl/articles/147740.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cellular radiosensitivity
genotoxic effects
ionizing radiation
comet assay
Opis:
The aim of the present study was to evaluate the cellular radiosensitivity and radiation-induced DNA damage and repair in Chinese hamster ovary (CHO) cells. Cell survival after irradiation was assessed using the clonogenic assay. The initial, radio-induced and residual DNA damage in Chinese hamster ovary (CHO) cells exposed to 60Co gamma-rays were determined using the alkaline comet assay. A linear-quadratic (LQ) survival curve was observed in CHO line. Data obtained by comet assay demonstrated a linear dose-response correlation in the range of tested doses (0.3-4 Gy). The process of DNA repair was modeled by exponential equation. In addition, we found a good correlation (R2 = 0.995) between clonogenic cell survival and radio-induced DNA damage.
Źródło:
Nukleonika; 2008, 53, 4; 161-165
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Squamous cell oesophageal cancer in retinoblastoma survivor: does germinal RB1 mutation influence chemo- and radiosensitivity?
Autorzy:
Dworzecki, Tomasz
Smolska-Ciszewska, Beata
Suwiński, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/1065813.pdf
Data publikacji:
2014
Wydawca:
Medical Education
Tematy:
case report
chemoresistance
radiosensitivity
retinoblastoma
second malignancy
squamous cell esophageal cancer
Opis:
The case of complete response of squamous cell oesophageal cancer to radiochemotherapy in patient previously operated due to hereditary retinoblastoma is presented. Second cancers in retinoblastoma survivors are the main cause of death in that group of patients in developed countries. There is little data on the outcome of treatment in those patients but the few papers available suggest rather poor prognosis. However, it is not clear whether the biology of cancer determined by RB gene mutation is responsible for that. The data suggesting decreased radio- and chemoresistance in cancers with decreased RB gene expression is discussed in the present paper. The role of that gene in the response to cancer treatment was showed in lung, breast and bladder cancer. Moreover, laboratory studies seem to confirm clinical observations and show that RB gene inhibition leads to increased cytotoxic effect of cisplatin, etoposide and 5-fluorouracil. It seems that without the incorporation of gene expression profiling into clinical practice further improvement in cancer treatment will be difficult to achieve.
Źródło:
OncoReview; 2014, 4, 2; A72-75
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between EGFR-initiated signalling, DNA double-strand break rejoining and survival in X-irradiated human glioma M059 cells
Autorzy:
Grądzka, I.
Buraczewska, I.
Szumiel, I.
Powiązania:
https://bibliotekanauki.pl/articles/146764.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
human glioma M059 K and J cells
DNA-dependent protein kinase (DNA-PK)
radiosensitivity
DNA double-strand break (DSB) rejoining
epidermal-growth-factor-receptor (EGFR)
signalling inhibitors: tyrphostin
Opis:
The aim of this study was to investigate the effect of signalling inhibition on survival and double-strand break (DSB) rejoining in cells differing in sensitivity to inhibitors, X-rays and bleomycin. Human glioma M059 cells, K (relatively radioresistant) and J (radiosensitive, defective in DSB rejoining for lack of DNA-dependent protein kinase catalytic subunit, DNA-PKcs) were pretreated with signalling inhibitors: tyrphostin AG 1478, specific for epidermalgrowth- factor-receptor (EGFR) kinase or PD 98059, specific for kinase MEK 1/2 (mitogen-activated, extracellular signal-activated kinases 1 and 2). Subsequently, the cells were X-irradiated or treated with bleomycin. Cell survival was determined by clonogenicity test. DSB rejoining was monitored with the use of pulsed-field gel electrophoresis (PFGE). We found that in X-irradiated M059 K cells EGFR kinase activity was necessary for efficient DSB rejoining and the kinase inhibitor, tyrphostin AG 1478, acted as radiosensitizer in the dose range that reduced cell survival to 0.7-0.8. Inhibition of EGFR kinase, however, did not decrease survival or affect DSB rejoining in DNA-PKcs-deficient M059 J cells. These results indicated that the decrease in cell survival was due to a disturbed DSB rejoining by the DNA-PK dependent system. In contrast, inhibition of MEK 1/2 kinase on EGFR downstream signalling pathway by PD 98059 did not affect DSB rejoining in either cell line and exerted a radioprotective effect.
Źródło:
Nukleonika; 2008, 53, 2; 37-44
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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