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1.
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.
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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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2.
001-es BibID:
BIBFORM060772
Első szerző:
Piacentini, Mauro
Cím:
The expression of "tissue" transglutaminase in two human cancer cell lines is related with the programmed cell death (apoptosis) / M. Piacentini, L. Fésüs, M. G. Farrace, L. Ghibelli, G. Melino
Dátum:
1991
ISSN:
0171-9335
Megjegyzések:
The expression of "tissue" transglutaminase (tTG) in two human tumor cell lines (the cervix adenocarcinoma line HeLa-TV and the neuroblastoma cells SK-N-BE-2) was found to be in correlation with the rate of physiological cell death (apoptosis) in culture. We investigated the effect of retinoic acid (RA) and alpha-difluoromethylornithine (DFMO) in order to elucidate the relationship between tTG expression and apoptosis. RA led to a 6-fold increase of tTG activity in HeLa-TV cells and to a 12-fold increase in SK-N-BE(2) cells, which was paralleled in both cell lines by a proportional increase in the number of apoptotic bodies recovered from the cultures. On the contrary, DFMO determined a dramatic reduction of tTG expression and of the apoptotic index. Immunohistochemical analysis using an anti-tTG antibody showed that the enzyme was accumulated in both cell lines within typical apoptotic bodies. Immunocytochemistry and cell cloning of SK-N-BE(2) line demonstrated that tTG was absent in cells showing neurite outgrowth, indicating that the enzyme expression is not associated with neural differentiation, even though both phenomena are elicited by retinoic acid. On the whole, these data indicate that also in tumors tTG activation takes place in cells undergoing apoptosis. The enzyme is activated in apoptotic cells to form cross-linked protein envelopes which are insoluble in detergents and chaotropic agents. The number of insoluble protein envelopes as well as the N,N-bis(gamma-glutamyl)polyamine cross-links is related with both tTG expression and apoptotic index, strongly suggesting the participation of the enzyme in the apoptotic program.
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Megjelenés:
European Journal of Cell Biology 54 : 2 (1991), p. 246-254. -
További szerzők:
Fésüs László (1947-) (orvos biokémikus)
Farrace, Maria Grazia
Ghibelli, L.
Melino, Gerry
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