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In this work, the development of immune responses derived from single naive CD8+ T cells was studied. It was found that the precursors of central memory T cells displayed slower cell cycle speeds than those of short-lived effector T cells, already during the early stages of the clonal expansion phase. Upon premature depletion of antigen-presenting dendritic cells, the cell cycle of these central memory precursors was further delayed and the generation of secondary immune responses was impaired., In dieser Arbeit wurde die Entwicklung von Immunantworten ausgehend von einzelnen naiven CD8+ T-Zellen untersucht. Dabei zeigte sich, dass die Vorläufer zentraler Gedächtnis-T-Zellen schon während der frühen Expansionsphase einen langsameren Zellzyklus aufweisen, als diejenigen kurzlebiger Effektor-T-Zellen. Nach vorzeitiger Depletion Antigen-präsentierender Dendritischer Zellen wurde der Zellzyklus dieser zentralen Gedächtnisvorläufer weiter verlangsamt und die Ausbildung sekundärer Immunantworten war gestört.

In this work, the development of immune responses derived from single naive CD8+ T cells was studied. It was found that the precursors of central memory T cells displayed slower cell cycle speeds than those of short-lived effector T cells, already during the early stages of the clonal expansion phase. Upon premature depletion of antigen-presenting dendritic cells, the cell cycle of these central memory precursors was further delayed and the generation of secondary immune responses was impaired., In dieser Arbeit wurde die Entwicklung von Immunantworten ausgehend von einzelnen naiven CD8+ T-Zellen untersucht. Dabei zeigte sich, dass die Vorläufer zentraler Gedächtnis-T-Zellen schon während der frühen Expansionsphase einen langsameren Zellzyklus aufweisen, als diejenigen kurzlebiger Effektor-T-Zellen. Nach vorzeitiger Depletion Antigen-präsentierender Dendritischer Zellen wurde der Zellzyklus dieser zentralen Gedächtnisvorläufer weiter verlangsamt und die Ausbildung sekundärer Immunantworten war gestört.

BACKGROUND Narrowband (TL-01) UVB phototherapy (UVB nb) is effective in treating inflammatory skin disease. The addition of UVA is traditionally advocated to reduce pruritus, but lacks evidence for this recommendation. OBJECTIVES The aim of this study was to assess the effect of UVB nb and UVA phototherapy in combination compared against UVB nb monotherapy on pruritus, disease activity, and quality of life. METHODS In this double-blind randomised clinical trial 53 patients suffering from inflammatory skin diseases with pronounced itching (Visual Analogue Scale (VAS) for pruritus ≥ 5) were randomised in to two treatment groups. One group received UVB nb (311nm) phototherapy alone and another group received a combination of UVB nb and UVA (320-400nm) phototherapy. UV therapy was performed three times per week over 16 weeks. Pruritus (VAS and 5-D itch score), disease activity and quality of life (Dermatology Life Quality Index, DLQI) were assessed at baseline and weeks 4, 8, 12, and 16. RESULTS In both treatment groups there was a reduction in pruritus scores, disease activity and DLQI. No difference in pruritus score, disease activity, and quality of life could be detected between the group receiving UVB nb alone and those receiving UVB nb combined with UVA. CONCLUSIONS Phototherapy with UVB nb and UVB nb combined with UVA are equally effective in treating inflammatory skin disease and indifferent in reducing disease-associated pruritus. Given this non-inferiority for UVB nb monotherapy, the recommendation of adding UVA to UVB nb phototherapy for pruritic inflammatory skin disease should be abandoned.