Sensitization with xenogeneic tissues alters the heavy chain repertoire of human anti-Galalpha1-3Gal antibodies.

Abstract:

BACKGROUND:Antigen sensitization alters the use of genes encoding the variable and constant regions of immunoglobulin, changing avidity, and function. Alterations in variable region genes induced by carbohydrate antigens have been studied extensively in animals but are incompletely characterized in humans. We asked how sensitization with the carbohydrate Galalpha1-3Gal modifies antibody heavy chain use. METHODS:To overcome limited access to B cells, we analyzed anti-Galalpha1-3Gal antibodies from the serum of naïve and sensitized human subjects with anti-sera specific for VH families. RESULTS:We find that in preimmune subjects, heavy chains of IgM anti-Galalpha1-3Gal derived primarily from VH3 family members, whereas the heavy chains of IgG are from diverse VH families. After sensitization, heavy chains of IgM and IgG antibodies both derived from diverse VH families. CONCLUSIONS:The preimmune repertoire of IgM antibodies to Galalpha1-3Gal is thus more restricted than the antibody repertoire after sensitization, suggesting an antigen-induced shift in the repertoire.

journal_name

Transplantation

journal_title

Transplantation

authors

Yu PB,Parker W,Nayak JV,Platt JL

doi

10.1097/01.tp.0000162976.07023.6d

subject

Has Abstract

pub_date

2005-07-15 00:00:00

pages

102-9

issue

1

eissn

0041-1337

issn

1534-6080

pii

00007890-200507150-00018

journal_volume

80

pub_type

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