Modulation of EL-4 mouse lymphoma cell proliferation by macrophages and tumor related factors

Augusto Pessina, Paolo Brambilla, Paolo Mocarelli

Research output: Contribution to journalArticlepeer-review


It is well known that macrophages play an important role in the control of tumor growth. This control may be the result of a direct action of macrophages or mediated by several biologically active products or factors elaborated by these and other cell populations. Our studies on the prliferation of a murine T-cell lymphoma (EL-4) showed that the treatment of the ascitic fluid (from the peritoneum of EL-4 bearing mice) with carbonyl iron resulted in a depletion of phagocytes concomitant with a significant increase of [3H] thymidine uptake by EL-4 cells. Further, the growth of EL-4 cells cultured in semisolid agar was significantly inhibited by an underlayer of large quantities of macrophages both from normal and EL-4 bearing mice as well as when cultured in the presence of PGE2. The underlayer of tumor macrophages P 388 D1 resulted in an increase of the EL-4 cell growth. Also, conditioned media obtained from in vitro liquid cultures of EL-4 cells and L 1210 cells (B-lymphoma) produced a remarkable inhibition of the in vitro cloning capacity and [3H] thymidine uptake by EL-4 cells. These data support the hypothesis that different factors from normal and hemopoietic tumor cells may control the tumor growth and point out that self-produced factors may modulate the proliferation of tumor cells.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
Issue number1
Publication statusPublished - Jul 1984


  • EL-4 lymphoma
  • Macrophages
  • Tumor factors

ASJC Scopus subject areas

  • Hematology


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