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Regulation of cell survival in CD95-induced T cell apoptosis: role of NF-κB/Rel transcription factors (1999)

Lamberti, A. ; Romano, M. F. ; Agosti, V. ; [et al.]

Springer

Apoptosis 4 (1999), S. 179-186

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ISSN: 1573-675X

Keywords: Apoptosis ; CD95 (Fas/APO-1) ; NF-κB/Rel ; T lymphocytes.

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract The activity of NF-κB/Rel transcription factors can inhibit the apoptosis induced by TNF, UV or cancer therapy drugs in a number of cell types, including human T lymphocytes. Furthermore, the NF-κB/Rel inducer, phorbol-12-myristate-13-acetate (PMA), has been reported to suppress the CD95-induced apoptosis of human T lymphocytes. To verify whether the survival-enhancing effect of PMA required NF-κB/Rel activity, we generated two Jurkat cell sublines (AL.7 and AL.8) transfected with a pCMV4-IκBα construct, and two (AL.3 and AL.5) with the void pCMV4 vector. Compared to wild type, AL.3 and AL.5 cells, the AL.7 and AL.8 sublines displayed markedly lower amounts of NF-κB/Rel nuclear complexes and a reduced expression of a κB-controlled CAT reporter gene after 1 and 4 h of incubation with PMA, respectively. All the five cell types displayed negligible levels of apoptosis when cultured with medium or PMA alone; when stimulated with the mAb CH-11, the AL.7 and AL.8 sublines displayed apoptotic responses only slightly (〈0.5 fold) higher than control cells. On the other hand, the salvage activity of PMA was partially impaired in the AL.7 and AL.8 sublines. PMA inhibited apoptosis by 〉85% in wild type, AL.3 and AL.5 cells and by 〈60% in the AL.7 and AL.8 sublines; the apoptosis percentages in the mAb CH-11 + PMA cultures of the IκBα-transfected cells were 〉4-fold higher than in control cells. We conclude that the inhibition of the CD95-induced apoptosis by PMA relies on both NF-κB/Rel-dependent and -independent mechanisms. The partial contribution of these nuclear factors to the suppression of apoptosis indicates that the NF-κB/Rel activity can influence the extent of the CD95-induced T cell death.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009662606398

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Physical properties of poly-D( - )(3-hydroxybutyrate)/poly(epichlorohydrin) blends (1992)

Tsukada, M. ; Romanò, M. ; Seves, A.

Weinheim : Wiley-Blackwell

Acta Polymerica 43 (1992), S. 327-330

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ISSN: 0323-7648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Description / Table of Contents: Die physikalischen Eigenschaften von Polymercompositen, die durch Mischung des kristallinen, bioabbaubaren und bioverträglichen Polymers Poly-D( - )(3-hydroxybutyrat) (PHB) mit nichtkristallinem, ataktischen Poly(epichlorhydrin) (PECH) erhalten wurden, werden untersucht. Die durch Eindampfen von Lösungen hergestellten PHB/PECH-Mischungen wurden mit Hilfe von thermomechanischen, röntgenographischen und viskolastischen Messungen sowie durch ihr Festigkeits- und Dehnungsverhalten charakterisiert. Aus den Ergebnissen wurde geschlossen, daß die kristallinen Bereiche des PHB die Rolle von Vernetzungen spielen, während das zwischen den kristallinen Bereichen befindliche amorphe PECH als Weichmacher wirkt. Ein einfacher dynamischer Verlustmodul, der der Glasübergangstemperatur entspricht, weist auf die Mischbarkeit des kristallinen PHB mit dem amorphen PECH hin.

Notes: Physical properties of a new polymer blend obtained by mixing poly-D( - )(3-hydroxybutyrate) (PHB), a crystalline polymer with interesting properties of biodegradability and biocompatibility, with uncrystallizable atactic poly(epichlorohydrin) (PECH) were studied. PHB/PECH blends, obtained by casting solution, were analysed by thermomechanical and X-ray analysis, viscoelastic measurements, and on the basis of strength and elongation measurements. It was concluded that the crystalline region of PHB plays an important role of crosslinks, and amorphous PECH filled between the crystalline regions plays a role of plasticizer. A single dynamic loss modulus, corresponding to the glass transition temperature, implies the miscibility between crystalline PHB and amorphous PECH.

Additional Material: 5 Ill.