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001-es BibID:	BIBFORM060767
Első szerző:	Nemes Z.
Cím:	Expression and activation of tissue transglutaminase in apoptotic cells of involuting rodent mammary tissue / Z. Nemes, R. R. Friis, D. Aeschlimann, S. Saurer, M. Paulsson, L. Fésüs
Dátum:	1996
ISSN:	0171-9335
Megjegyzések:	Apoptosis is a form of cell death in which cellular integrity is maintained and neither cytoplasmic nor nuclear content is released. The Ca(2+)-dependent tissue transglutaminase (tTG) is an enzyme that forms protein cross-links between specific glutamyl and lysyl side-chains of intra- and extracellular proteins, therefore it may be responsible for the structural stabilization observed during the death process. In this study, the expression of tTG was investigated following the physiological process of forced weaning which results in an almost complete elimination of secretory epithelium by apoptosis and remodelling of the tissue structure. A dramatic induction of tTG was detected by immunoblotting of total mammary gland homogenates prepared from the involuting glands. The concentration of epsilon(gamma-glutamyl)-lysine crosslinks was also elevated in these samples, showing that the enzyme is activated during apoptosis. To determine the distribution of tTG and its relationship to apoptotic cells, paraffin-embedded specimens were studied by RNA in situ hybridization and immunohistochemical methods as well as using in situ labeling for nuclear fragmentation. All of these approaches indicated that mammary secretory epithelium expressed tissue transglutaminase coincident with the onset of apoptosis. The apoptotic and tTG-expressing cells were found to be identical as demonstrated by a histological double-labeling technique.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	European Journal of Cell Biology 70 : 2 (1996), p. 125-133. -
További szerzők:	Friis, Bob R. R. Aeschlimann, Daniel Saurer, S. Paulsson, M. Fésüs László (1947-) (orvos biokémikus)
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001-es BibID:	BIBFORM028770
Első szerző:	Szegezdi Éva
Cím:	Apoptosis-linked in vivo regulation of the tissue transglutaminase gene promoter / É. Szegezdi, Zs. Szondy, L. Nagy, Z. Nemes, R. R. Friis, P. J. A. Davies, L. Fésüs
Dátum:	2000
ISSN:	1350-9047
Megjegyzések:	Tissue transglutaminase (tTG) is upregulated in various cells undergoing apoptosis. To investigate the transcriptional regulation of tTG a mouse strain carrying a beta-galactosidase reporter gene under the control of a 3.8 kilobase fragment of the tTG promoter was characterised. The transgene construct was shown to be expressed in the apoptotic regions of the mouse embryo. Here we report that the regulation of the transgene is also apoptosis-linked in adult animals. The transgene is induced in endocrine apoptosis involving mammary gland involution and corpus luteum regression. Induction of the reporter gene is detectable during in vivo but not in vitro apoptosis of thymocytes induced by the glucocorticoid receptor, the nur77, p53 and the retinoid receptor gamma mediated pathways. Additionally, the lacZ expression mimics the activation of the endogenous promoter in tissues characterised by high apoptotic turnover. These results suggest that the apoptosis-specific transcriptional regulation of tTG is mediated through elements of a 3.8 kb promoter and may require cosignals available only in tissue environment.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk egyetemen (Magyarországon) készült közlemény
Megjelenés:	Cell Death and Differentiation. - 7 : 12 (2000), p. 1225-1233. -
További szerzők:	Szondy Zsuzsanna (1959-) (molekuláris sejtbiológus, biokémikus) Nagy László (1966-) (molekuláris sejtbiológus, biokémikus) Nemes Zoltán (1942-) (patológus) Friis, Bob R. R. Davies, Peter J. A. Fésüs László (1947-) (orvos biokémikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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