BAFF induces a hyper-IgA syndrome in the intestinal lamina propria concomitant with IgA deposition in the kidney independent of LIGHT.

Autor: McCarthy DD; Department of Immunology, University of Toronto, 1 King's College Circle, Toronto, Ont., Canada M5S 1A8., Chiu S, Gao Y, Summers-deLuca LE, Gommerman JL
Jazyk: angličtina
Zdroj: Cellular immunology [Cell Immunol] 2006 Jun; Vol. 241 (2), pp. 85-94. Date of Electronic Publication: 2006 Sep 20.
DOI: 10.1016/j.cellimm.2006.08.002
Abstrakt: BAFF is a peripheral B cell survival factor and can mediate antibody (Ab) class switching. Over-expression of BAFF in mice results in B cell hyperplasia, elevated serum immunoglobulin (Ig), spontaneous germinal centre (GC) reactions and mild glomerulonephritis (GN). Here we show that, in addition to driving excessive levels of serum IgA, BAFF over-expression results in increased IgA levels within the intestinal lamina propria (LP) and deposition of IgA immune complexes in the renal glomerular mesangium. LIGHT has been previously shown to mediate a similar phenotype via signaling through the lymphotoxin-beta receptor (LTbetaR). We evaluated if LIGHT and BAFF cooperate in the etiology of a hyper-IgA syndrome in BAFF-overexpressing transgenic (BAFF-Tg) mice. We find that LIGHT-deficient BAFF-Tg mice exhibit similar levels of IgA in the serum, gut and kidney and develop nephritis to the same degree as LIGHT-sufficient BAFF-Tg mice. Therefore, in the context of BAFF over-expression, LIGHT is dispensable for the generation of a hyper-IgA syndrome accompanied by nephritis.
Databáze: MEDLINE
Externí odkaz: