Macrophage-mediated suppression of immune responses in Toxoplasma-infected mice. I. Inhibition of proliferation of lymphocytes in primary antibody responses

Yasuhiro Suzuki, Akio Kobayashi

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The suppressor cells induced by Toxoplasma infection were shown to be macrophages, since they adhered to plastic, and their suppressive activity in anti-sheep erythrocytes (SRBC) antibody responses was abrogated by treatment with silica or carrageenan, which are selectively cytotoxic for macrophages. The suppressor macrophages strongly inhibited the uptake of tritiated thymidine ([3H]TdR) by normal mouse spleen cells in the responses to SRBC and Toxoplasma antigens. Supernatant fluids from the suppressor macrophages could not passively transfer the suppressive effect on anti-SRBC antibody responses. Furthermore, when the suppressor macrophages were isolated by a cell-impermeable membrane from normal mouse spleen cells, the antibody responses of normal spleen cells were not suppressed. These results indicate that suppression of antibody responses in Toxoplasma-infected mice is caused by an inhibitory effect of the suppressor macrophages upon proliferation of lymphocytes via direct contact with responder target cells. The suppressive effect of the macrophages was not counteracted by indomethacin, a potent inhibitor of prostaglandin synthesis, or catalase, a catabolic enzyme for hydrogen peroxide (H2O2).

Original languageEnglish
Pages (from-to)417-427
Number of pages11
JournalCellular Immunology
Volume85
Issue number2
DOIs
StatePublished - May 1984

ASJC Scopus subject areas

  • Immunology

Fingerprint

Dive into the research topics of 'Macrophage-mediated suppression of immune responses in Toxoplasma-infected mice. I. Inhibition of proliferation of lymphocytes in primary antibody responses'. Together they form a unique fingerprint.

Cite this