L-selectin-specific autoantibodies in murine lupus: possible involvement in abnormal homing and polarization of CD4+ T cell subsets.
One notable functional abnormality in murine and human systemic lupus erythematosus (SLE) is the defect in the production of IL-2 in association with the deficit in naive CD4+ T cells. The mechanism is unknown, but one idea is that naturally occurring autoantibodies with specificities to the naive CD4+ T cell subpopulation are related to this event. We selected hybridoma monoclonal autoantibodies from SLE-prone (New Zealand Black (NZB) x New Zealand White (NZW))F1 mice that reacted with restricted populations of CD4+ T cells. One of these, H32, was specific for L-selectin, as determined by 1) distribution of Ag H32 on lymphoid cells similar to Mel-14, an epitope of L-selectin; 2) shedding of 80-kDa molecules with epitope H32 from the surface of lymph node cells coincidentally with Mel-14, when stimulated with phorbol ester; 3) cross-inhibitory activities on Ag binding between H32 and Mel-14; and 4) reactivity of H32 with recombinant mouse L-selectin. Pretreatment of 51Cr-labeled lymphocytes from BALB/c mice with H32 significantly inhibited their homing to lymph nodes in vivo. The BALB/c splenic H32+ CD4+ T cell subset produced few cytokines except IL-2, thus corresponding to naive ThP-type cells. This subset was markedly selectively depleted in aged (NZB x NZW)F1 mice. There was an age-associated increase in frequencies and titers of anti-L-selectin autoantibodies in sera from (NZB x NZW)F1 mice. Thus, abnormalities of naive CD4+ T cell subset, including IL-2 production in subjects with SLE, are at least partly attributed to the generation of autoantibodies to L-selectin.
Hattori
S
S
Department of Pathology, Juntendo University School of Medicine, Tokyo, Japan.
Nishimura
H
H
Tsurui
H
H
Kato
M
M
Endo
N
N
Abe
M
M
Akakura
S
S
Mitsui
K
K
Ishikawa
S
S
Hirose
S
S
Shirai
T
T
D000375:Aging / Q000276:immunology; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000494:pharmacology; D000918:Antibody Specificity; D001323:Autoantibodies / Q000097:blood / Q000502:physiology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000473:pathology; D002465:Cell Movement / Q000276:immunology*; D017637:Clonal Deletion; D006825:Hybridomas; D019041:L-Selectin / Q000276:immunology*; D008180:Lupus Erythematosus, Systemic / Q000276:immunology* / Q000473:pathology; D008231:Lymphopenia / Q000276:immunology / Q000503:physiopathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008814:Mice, Inbred NZB
D000911:Antibodies, Monoclonal; D001323:Autoantibodies; D019041:L-Selectin