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Volume 270, Number 8, Issue of February 24, 1995 pp. 3876-3881
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
IV(NeuGc28NeuGc)-GgCer Is Restricted to CD4 T Cells Producing Interleukin-2 and a Small Population of Mature Thymocytes in Mice

(Received for publication, July 11, 1994; and in revised form, November 9, 1994)

Kyoko Nakamura ,  Hidenori Suzuki ,  Yoshio Hirabayashi ,  Akemi Suzuki

Monoclonal antibody YK-3 was established by immunization with IV^3alpha(NeuGcalpha2-8NeuGc)-Gg(4)Cer (G(NeuGc-NeuGc-)), and its epitope was determined to be NeuGcalpha2-8NeuGcalpha2-3Galbeta1. Thin layer chromatography immunostaining with YK-3 detected only G(NeuGc-NeuGc-) among the gangliosides of mouse thymocytes and splenocytes. Immunohistochemical staining with YK-3 visualized the medulla of mouse thymus and T cell-dependent areas of mouse spleen and mesenteric lymph nodes. Two-color flow cytometry demonstrated that G(NeuGc-NeuGc-) was expressed on a quarter of CD3 mature thymocytes and strongly expressed on three quarters of CD4 T cells in the spleen, lymph nodes, and peripheral blood but not on CD8 T cells or B cells. G(NeuGc-NeuGc-)-positive cells and negative cells were separated by panning with YK-3 on Petri dishes into adherent and nonadherent fractions. Following stimulation with concanavalin A, adherent cells, predominantly G(NeuGc-NeuGc-), produced more interleukin-2 (IL-2) and markedly less interleukin-4 (IL-4) than nonadherent cells. This conclusion is supported by data obtained by lysis of cells by YK-3 and complement. These data indicate that the cell surface expression of G(NeuGc-NeuGc-) is restricted to a small number of mature thymocytes and a subset of CD4 T cells, which produce abundant IL-2 and very little IL-4, suggesting that G(NeuGc-NeuGc-) is an excellent marker for mouse naive T or T helper 1-like cells in vivo.



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