Abstract:
:Common variable immunodeficiency (CVID) is associated with low serum immunoglobulin concentrations and an increased susceptibility to infections and autoimmune diseases. The treatment of choice for CVID patients is replacement intravenous immunoglobulin (IVIg) therapy. IVIg has been beneficial in preventing or alleviating the severity of infections and autoimmune and inflammatory process in majority of CVID patients. Although the mechanisms of action of IVIg given as 'therapeutic high dose' in patients with autoimmune diseases are well studied, the underlying mechanisms of beneficial effects of IVIg in primary immunodeficiencies are not completely understood. Therefore we investigated the effect of 'replacement dose' of IVIg by probing its action on B cells from CVID patients. We demonstrate that IVIg at low doses induces proliferation and immunoglobulin synthesis from B cells of CVID patients. Interestingly, B cell stimulation by IVIg is not associated with induction of B cell effector cytokine IFN-γ and of transcription factor T-bet. Together, our results indicate that in some CVID patients, IVIg rectifies the defective signaling of B cells normally provided by T cells and delivers T-independent signaling for B cells to proliferate. IVIg 'replacement therapy' in primary immunodeficiencies is therefore not a merepassive transfer of antibodies to prevent exclusively the recurrent infections; rather it has an active role in regulating autoimmune and inflammatory responses through modulating B cell functions and thus imposing dynamic equilibrium of the immune system.
journal_name
J Autoimmunjournal_title
Journal of autoimmunityauthors
Bayry J,Fournier EM,Maddur MS,Vani J,Wootla B,Sibéril S,Dimitrov JD,Lacroix-Desmazes S,Berdah M,Crabol Y,Oksenhendler E,Lévy Y,Mouthon L,Sautès-Fridman C,Hermine O,Kaveri SVdoi
10.1016/j.jaut.2010.09.006subject
Has Abstractpub_date
2011-02-01 00:00:00pages
9-15issue
1eissn
0896-8411issn
1095-9157pii
S0896-8411(10)00115-0journal_volume
36pub_type
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