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001-es BibID:	BIBFORM037170
Első szerző:	Garabuczi Éva (biokémikus, molekuláris biológus)
Cím:	Retinoids produced by macrophages engulfing apoptotic cells contribute to the appearance of transglutaminase 2 in apoptotic thymocytes / Éva Garabuczi, Beáta Kiss, Szabolcs Felszeghy, Gregory J. Tsay, László Fésüs, Zsuzsa Szondy
Dátum:	2012
Megjegyzések:	Transglutaminase 2 (TG2) has been known for a long time to be associated with the in vivo apoptosis program of various cell types including T cells. Though the expression of the enzyme was strongly induced in mouse thymocytes following apoptosis induction in vivo, no significant induction of TG2 could be detected, when thymocytes were induced to die by the same stimuli in vitro indicating that signals arriving from the tissue environment are required for the in vivo induction of the enzyme in apoptotic thymocytes. Previous studies have shown that one of these signals is TGF-beta which is released by macrophages engulfing apoptotic cells. Besides TGF-beta the TG2 promoter contains retinoic acid response elements as well. Here we show that in vitro retinoic acids, or TGF-beta and retinoic acids together can significantly enhance the TG2 mRNA expression in dying thymocytes, and the apoptotic signal contributes to the TG2 induction. Inhibition of retinoic acid synthesis either by aldehyde or retinaldehyde dehydrogenases significantly attenuates the in vivo induction of TG2 following apoptosis induction indicating that retinoids indeed might contribute in vivo to the apoptosis-related TG2 expression. What is more, the in vivo apoptosis induction in the thymus is accompanied by an enhanced retinoid dependent transcriptional activity possibly due to the enhanced retinoid synthesis by macrophages engulfing apoptotic cells. Our data reveal a new crosstalk between macrophages and apoptotic cells, in which apoptotic cell uptake-induced retinoid synthesis in macrophages enhances TG2 expression in the dying thymocytes.
ISBN:	978-953-95551-4-4
Tárgyszavak:	Természettudományok Biológiai tudományok előadáskivonat TG2 thymocyte retinoids macrophage
Megjelenés:	FEBS3 + Meeting From molecules to life and back, Book of abstracts / eds. Jerka Dumic, Zrinka Kovarik, Jadranka Varljen. - p. 203. -
További szerzők:	Kiss Beáta (1984-) (biokémikus, molekuláris biológus) Felszeghy Szabolcs Béla (1972-) (fogorvos, anatómus, kötőszövetbiológus) Tsay, Gregory J. Fésüs László (1947-) (orvos biokémikus) Szondy Zsuzsanna (1959-) (molekuláris sejtbiológus, biokémikus)
Pályázati támogatás:	TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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