PMID: 9182683Jun 16, 1997Paper

Lymphotoxin-alpha (LTalpha) supports development of splenic follicular structure that is required for IgG responses

The Journal of Experimental Medicine
Y X FuD D Chaplin

Abstract

LTalpha-deficient (LTalpha-/-) mice show altered splenic microarchitecture. This includes loss of normal B cell-T cell compartmentalization, of follicular dendritic cell (FDC) clusters, and of ability to form germinal centers (GC). LTalpha-/- mice immunized with sheep red blood cells (SRBC) produced high levels of antigen-specific IgM but no IgG in either primary or secondary responses, demonstrating failure of Ig class switching. This inability to switch to IgG could have been due to the altered splenic microarchitecture in these mice. Alternatively, it could have been due directly to a requirement for LTalpha expression by lymphocytes cooperating in the antibody response. To investigate this, we performed reciprocal spleen cell transfers. When irradiated LTalpha-/- mice were reconstituted with wild-type splenocytes and immunized immediately with SRBC, splenic microarchitecture remained disturbed and there was no IgG response. In contrast, when irradiated wild-type animals received splenocytes from LTalpha-/- mice, follicle structure and a strong IgG response were retained. These data indicate that LTalpha-deficient B cells and T cells have no intrinsic defect in ability to generate an IgG response. Rather, the altered microen...Continue Reading

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