Article (Scientific journals)
Constitutive nuclear factor-kappa B activity preserves homeostasis of quiescent mature lymphocytes and granulocytes by controlling the expression of distinct Bcl-2 family proteins
Bureau, Fabrice; Vanderplasschen, Alain; Jaspar, Fabrice et al.
2002In Blood, 99 (10), p. 3683-3691
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Abstract :
[en] Constitutive nuclear factor kappaB (NFkappaB) activity protects quiescent mature Immune cells from spontaneous apoptosis. Here, we examined whether NF-kappaB exerts its antiapoptotic function in these cells through the control of Bcl-2 family proteins. Specific pharmacologic inhibitors of NF-kappaB were used to achieve total NF-kappaB inactivation In quiescent human blood lymphocytes, granulocytes, and monocytes. NF-kappaB inhibition induced drastic lymphocyte and granulocyte apoptosis, but only moderate monocyte apoptosis. T- and B-cell apoptosis was slow and associated with a gradual down-regulation of the prosurvival Bcl-2 family proteins Bcl-X-L and BcI-2, respectively. By contrast, granulocyte apoptosis was fast and accompanied by a rapid cellular accumulation of Bcl-x(s), the proapoptotic Bcl-x isoform that is generated from alternative splicing of the bcl-x pre-mRNA. Finally, antisense bci-x(L) and bcl-2 knockdown in T and B cells, respectively, and induction of Bcl-xs expression in granulocytes through antisense oligonucleotide-mediated redirection of bcl-x pre-mRNA splicing were sufficient to induce significant apoptosis in these cells. Taken together, these results reveal that basal NF-kappaB activity preserves homeostasis of quiescent mature lymphocytes and granulocytes through regulation of distinct members of the Bcl-2 family. This study sheds light on the constitutive mechanisms by which NF-kappaB maintains defense integrity. (C) 2002 by The American Society of Hematology.
Disciplines :
Anatomy (cytology, histology, embryology...) & physiology
Veterinary medicine & animal health
Author, co-author :
Bureau, Fabrice ;  Université de Liège - ULiège > Département de sciences fonctionnelles > Biochimie et biologie moléculaire
Vanderplasschen, Alain ;  Université de Liège - ULiège > Immunologie et vaccinologie
Jaspar, Fabrice ;  Université de Liège - ULiège > Clinique des grands animaux
Minner, F.
Pastoret, Paul-Pierre ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Département des maladies infectieuses et parasitaires
Merville, M. P.
Bours, Vincent 
Lekeux, Pierre ;  Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie
Language :
English
Title :
Constitutive nuclear factor-kappa B activity preserves homeostasis of quiescent mature lymphocytes and granulocytes by controlling the expression of distinct Bcl-2 family proteins
Publication date :
May 2002
Journal title :
Blood
ISSN :
0006-4971
eISSN :
1528-0020
Publisher :
American Society of Hematology, Washington, United States - District of Columbia
Volume :
99
Issue :
10
Pages :
3683-3691
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 March 2009

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