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001-es BibID:	BIBFORM001278
Első szerző:	Bánfalvi Gáspár (sejtbiológus, gyógyszerész)
Cím:	Gamma irradiation induced apoptotic changes in the chromatin structure of human erythroleukemia K562 cells / Gaspar Banfalvi, Mariann Klaisz, Kinga Ujvarosi, Gyorgy Trencsenyi, David Rozsa, Gabor Nagy
Dátum:	2007
Megjegyzések:	Exponentially growing human erythroleukemia K562 cells were synchronized by centrifugal elutriation prior to and after Co60 gamma-irradiation (4 Gy). Forward scatter flow cytometry used for size analysis revealed the increase of an early apoptotic cell population ranging from lower (0.05 C-value) to higher DNA content (approximately 1 C) as the cells progressed through the S phase. The increase in cellular DNA content expressed in C-values correlated with apoptotic chromatin changes manifested as many small apoptotic bodies in early S phase and larger but less numerous disintegrated apoptotic bodies in late S phase. Most significant changes after exposure to gamma-irradiation took place in early S phase resulting in an increase of nuclear size by more than 50%. Cell fractions containing irradiated cells showed enhanced growth arrest at 2.4 C-value, which was accompanied by apoptosis. Apoptotic cell cycle arrest near to the G1/G0 checkpoint and apoptotic changes indicate that the radiation resistance of K562 cells is related to the bypass of the early stage of the p53 apoptotic pathway. Apoptotic changes in chromatin structure induced by gamma-irradiation indicate that these injury-specific changes can be identified and distinguished from chromatin changes induced by UV radiation or heavy metals.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban gamma sugárzás apoptózis kromatin szerkezet
Megjelenés:	Apoptosis. - 12 : 12 (2007), p. 2271-2283. -
További szerzők:	Klaisz Mariann Ujvárosi Kinga Trencsényi György (1978-) (biológus, biokémikus, molekuláris biológus) Rózsa Dávid (1982-) (Ph.D hallgató) Szemán-Nagy Gábor (1975-) (biológia tanár-molekuláris biológus)
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001-es BibID:	BIBFORM001308
Első szerző:	Szemán-Nagy Gábor (biológia tanár-molekuláris biológus)
Cím:	Gamma irradiation-induced apoptosis in murine pre-B cells prevents the condensation of fibrillar chromatin in early S phase / G. Nagy, M. Gacsi, M. Rehak, A. G. Basnakian, M. Klaisz, G. Banfalvi
Dátum:	2004
ISSN:	1360-8185
Megjegyzések:	Local changes in chromatin structure leading to temporally distinct geometric forms were characterized in nuclei of reversibly permeabilized cells. Reversal of permeabilization was tested by 3H-thymidine incorporation and trypan blue dye exclusion. Apoptotic changes were visualized in a cell cycle dependent manner at the chromatin level by fluorescent microscopy in non-irradiated cells and after 400 rad Co60 irradiation. Fluorescent microscopy of chromatin structures belonging mainly to the interphase of the cell cycle confirmed the existence of specific geometric forms in nuclei of non-irradiated cells. In this control population, the following main transitory forms of condensing chromatin were distinguished: decondensed veil-like structures and fibrous structures in early and mid S phase (2.0-2.5 average C-value), chromatin bodies, semicircles later in mid S phase (3.0-3.5 C), precondensed chromosomes in late S (3.5-3.7 C) and metaphase chromosomes at the end and after S phase (3.7-4.0 C). Our results show that upon gamma-irradiation (a) the cellular and nuclear sizes were increased, (b) the DNA content was lower in each elutriated subpopulation of cells, (c) the progression of the cell cycle was arrested in the early S phase at 2.4 C value, (d) the chromatin condensation was blocked between the fibrillar chromatin and precondensed elongated chromosomal forms, and (e) the number and size of apoptotic bodies were inversely correlated with the progression of the cell cycle, with many small apoptotic bodies in early S phase and less and larger apoptotic bodies in late S phase.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban gamma sugárzás kromatin kondenzálás fibrilláris kromatin
Megjelenés:	Apoptosis. - 9 : 6 (2004), p. 765-776. -
További szerzők:	Gácsi Mariann Rehák Mariann Basnakian, Alexei G. Klaisz Mariann Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
Internet cím:	elektronikus változat
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