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001-es BibID:BIBFORM060632
Első szerző:Fésüs László (orvos biokémikus)
Cím:Apoptotic hepatocytes become insoluble in detergents and chaotropic agents as a result of transglutaminase action / Laszlo Fesus, Vilmos Thomazy, Francesco Autuori, Maria P. Ceru, Edit Tarcsa, Mauro Piacentini
Dátum:1989
ISSN:0014-5793
Megjegyzések:Physiological deletion of cells ensues programmed death which involves formation of apoptotic bodies with fragmented DNA. Here we report that apoptotic hepatocytes are insoluble in detergents, urea, guanidine hydrochloride, reducing agents and thereby can be isolated from rat liver following collagenase treatment. They are wrinkled, spherical structures similar to cornified envelopes of epidermis by phase-contrast microscopy and show irregular, globular morphology by scanning-electron microscopy. Part of their DNA content is cleaved into nucleosomal and oligonucleosomal fragments. Their insolubility, like that of the cornified envelope, is evoked by epsilon-(gamma-glutamyl)lysine and N1,N8-bis(gamma-glutamyl)spermidine protein cross-linking bonds formed by transglutaminase.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Febs Letters 245 : 1-2 (1989), p. 150-154. -
További szerzők:Thomázy Vilmos Autuori, Francesco Cerù, Maria Paola Tarcsa Edit Piacentini, Mauro
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2.

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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3.

001-es BibID:BIBFORM060634
Első szerző:Piacentini, Mauro
Cím:Retinoic acid-induced modulation of rat liver transglutaminase and total polyamines in vivo / Mauro Piacentini, Laszlo Fesus, Claudia Sartori, Maria Paola Ceru
Dátum:1988
ISSN:0264-6021
Megjegyzések:The effect of a single intraperitoneal injection of retinoic acid on liver transglutaminase (EC 2.3.2.13) activity and total putrescine, spermidine and spermine was studied. The results demonstrate that: (1) transglutaminase activity is increased over control values as early as 4-6 h after treatment, reaching a maximum (2-fold increase) at 12 h and returning to control values at 36 h; (2) the retinoic acid-induced form of enzyme is the soluble tissue transglutaminase; (3) actinomycin D treatment does not completely inhibit the early (6 h) increase of activity, while suppressing that at 12 h; (4) the immunoassay of the soluble transglutaminase shows that, 6 h after treatment, there is no increase in the protein, whereas at 12 and 24 h a significant increase is observed; (5) putrescine, but not spermidine and spermine, increases (5-7-fold) 6 and 18 h after the retinoic acid treatment. The possibility also that the expression of soluble transglutaminase is modulated in vivo by retinoic acid and the relationship to polyamine levels are discussed.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biochemical Journal 253 : 1 (1988), p. 33-38. -
További szerzők:Fésüs László (1947-) (orvos biokémikus) Sartori, Claudia Cerù, Maria Paola
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Intézményi repozitóriumban (DEA) tárolt változat
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