Profound atrophy of the bone marrow reflecting major histocompatibility complex class II-restricted destruction of stem cells by CD4+ cells

doi:10.1084/jem.180.1.307

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Profound atrophy of the bone marrow reflecting major histocompatibility complex class II-restricted destruction of stem cells by CD4+ cells

J Sprent, CD Surh, D Agus, M Hurd, S Sutton and WR Heath
Department of Immunology, Scripps Research Institute, La Jolla, California 92037.

The effector functions of CD4+ cells in vivo are presumed to reflect a combination of lymphokine-mediated bystander reactions and direct cytotoxic T lymphocyte activity. To assess the relative importance of these two mechanisms, we studied the effects of transferring small doses of purified unprimed CD4+ cells to lightly irradiated (600 cGy) recipients expressing major histocompatibility complex class II (Ia) differences. Within the first week after transfer, the host marrow was rapidly repopulated with hemopoietic cells. Thereafter, however, the donor CD4+ cells caused massive destruction of hemopoietic cells, both in marrow and spleen. Marrow aplasia did not affect stromal cells and was prevented by coinjecting donor but not host bone marrow. The use of allotypic markers and fluorescence-activated cell sorter analysis indicated that the destructive effects of CD4+ cells were directed selectively to host Ia+ hemopoietic cells, including stem cells; donor hemopoietic cells and Ia- host T cells were spared. No evidence could be found that the ongoing destruction of host cells impaired the capacity of donor stem cells to repopulate marrow, spleen, or thymus. Moreover, CD4+ cells failed to destroy host-type hemopoietic cells from Ia-deficient mice. Tissue destruction by CD4+ cells thus did not seem to reflect a bystander reaction. We conclude that, under defined conditions, CD4+ cells can manifest extremely potent Ia-restricted CTL activity in vivo, probably through recognition of covert Ia expression on stem cells and/or their immediate progeny.
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