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Scand J Immunol. 1993 Apr;37(4):529-32.

Activated natural killer cells suppress myelopoiesis in mice with severe combined immunodeficiency.

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1
Department of Immunology, Karolinska Institute, Stockholm, Sweden.

Abstract

The in vivo effect of natural killer (NK) cell activation on autologous myelopoiesis was studied in an environment deficient of functional T and B cells. Administration of 3,6-bis[2-(Dimethylamino)-ethoxy]-9H-xanthen-9-one dihydrochloride) Tilorone) or recombinant interleukin-2 (rIL-2) to mice with severe combined immunodeficiency (C.B.-17 scid/scid) resulted in an increase in YAC-1 lysis by their splenocytes as well as bone marrow cells. Recombinant IL-2 furthermore led to a fivefold increase in the cellularity of the spleen. When assayed against human NK/lymphokine-activated killer (LAK) target, K562 cell line, the IL-2-activated mouse cells exhibited no cytotoxicity across the species barrier. Both agents induced a profound suppression of myelopoietic progenitor cells as measured in a 7-day granulocyte-macrophage colony forming cell (GM-CFC) assay. We conclude that the presence of neither functional T nor B cells is necessary for NK cells to mediate inhibition of myelopoiesis in the autologous host.

[Indexed for MEDLINE]

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