抄録
The DNA synthesis in syngeneie, allogeneic and xenogeneic cells was inhibited by peritoneal macrophages of normal WKA rats. This inhibitory effect of macrophages was found to be mediated by a soluble factor (MfID) released into a culture medium from macrophages which was heat-stable and non-dialyzable. The MfID was also responsible for the inhibition of lymphocyte DNA synthesis by MIX reaction. The action of MfID was indicated to suppress rather than to kill cell growth. It was interpreted that the inhibitory effect of macrophages on cellular DNA synthesis is their inherent property and macrophages may play the role of regulating the proliferation of lymphocytes and other cells.
