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001-es BibID:BIBFORM060773
Első szerző:Piacentini, Mauro
Cím:"Tissue" transglutaminase is specifically expressed in neonatal rat liver cells undergoing apoptosis upon epidermal growth factor-stimulation / M. Piacentini, F. Autuori, L. Dini, M. G. Farrace, L. Ghibelli, L. Piredda, L. Fesus
Dátum:1991
ISSN:0302-766X
Megjegyzések:We recently reported that activation of "tissue" transglutaminase (EC 2.3.2.13; tTG) in liver cells undergoing apoptosis determines extensive cross-linking of cellular proteins resulting in the formation of SDS-insoluble shells in the so-called "apoptotic bodies". In attempt to obtain further insight into the role played by tTG in apoptosis of liver cells, we investigated its expression in primary cultures of neonatal rat liver cells stimulated with epidermal growth factor (EGF). EGF-treatment of neonatal rat liver cells induces first hyperplasia of hepatocytes, followed by involution characterized by a high incidence of apoptosis. The proliferative phase of hepatocytes is paralleled by a 10-fold increase in tTG mRNA level, which is followed, during the phase of involution, by sequential increases in enzyme activity and levels of SDS-insoluble apoptotic bodies. tTG immunostaining at both the light- and electron-microscopic levels shows that the most intensive reaction is present in globular structures showing the typical morphological appearance of mature apoptotic bodies. In early apoptotic stages, tTG protein is localized in the perinuclear region of the cell. Intense immunostaining is also found in the apoptotic bodies present inside phagosomes within the cytoplasm of neighboring cells. This evidence confirms and extends our previous findings, indicating that tTG induction and activation specifically takes place in cells undergoing apoptosis, suggesting a key role for the enzyme in the apoptotic program.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Cell and Tissue Research 263 : 2 (1991), p. 227-235. -
További szerzők:Autuori, Francesco Dini, Luciana Farrace, Maria Grazia Ghibelli, L. Piredda, Lucia Fésüs László (1947-) (orvos biokémikus)
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001-es BibID:BIBFORM060624
Első szerző:Piacentini, Mauro
Cím:In vivo and in vitro induction of 'tissue' transglutaminase in rat hepatocytes by retinoic acid / M. Piacentini, M. P. Cerù, L. Dini, M. di Rao, L. Piredda, V. Thomazy, P. J. A. Davies, L. Fesus
Dátum:1992
ISSN:0167-4889
Megjegyzések:Tissue transglutaminase (tTG) expression was found to be induced in rat liver following in vivo retinoic acid (RA) treatment (Piacentini et al. (1988) Biochem. J. 253, 33-38). Here we show that the increased enzyme expression in rat liver is at least partially the result of the action of RA in parenchymal cells. In fact, (a) when hepatocytes are isolated from RA-treated animals their transglutaminase protein content is much higher than in similarly isolated control cells; (b) higher tTG protein level is also found by immunoelectronmicroscopy in the hepatocytes of the RA-treated rats as compared with the very low amount detected in the controls; (c) RA induces tTG in hepatocytes under culture conditions as well. One of the functions of tTG is to form a protein polymer in dying apoptotic cells by epsilon(gamma-glutamyl)lysine and, specifically gamma-glutamylpolyamine cross-links (Fesus et al. (1989) FEBS Lett. 245, 150-154). Noteworthy, after in vivo and in vitro RA-treatment we could not determine any increase (there was even a slight decrease) in the number of the cross-linked apoptotic envelopes. In keeping with this is the significant reduction of protein bound gamma-glutamylpolyamine detected in hepatocytes exposed to RA in culture. These findings suggest that the RA-induced tTG in parenchimal cells is an inactive form.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biochimica et Biophysica Acta (BBA). Molecular Cell Research. - 1135 : 2 (1992), p. 171-179. -
További szerzők:Cerù, Maria Paola Dini, Luciana Rao, Massimo di Piredda, Lucia Thomázy Vilmos Davies, Peter J. A. Fésüs László (1947-) (orvos biokémikus)
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