Journal of Clinical Immunology

, Volume 10, Issue 5, pp 247–254 | Cite as

Role of monocytes in anti-CD3-induced T-cell DNA synthesis: Effect of chloroquine and monensin on anti-CD3-induced human T-cell activation

  • Bharathi Vayuvegula
  • Kiyoshi Ohira
  • Sastry Gollapudi
  • Sudhir Gupta
Original Articles


Anti-CD3 monoclonal antibody (MoAb) induces proliferation of freshly isolated peripheral blood T cells only in the presence of monocytes/macrophages and requires binding of the Fc portion of antibody to monocytes/macrophages. In this investigation, we examined whether monocytes process anti-CD3 similar to any soluble antigen and present to T cells in context with HLA-DR to induce maximal DNA synthesis. Adherent monocytes were pulsed with anti-CD3 MoAb in the presence or absence of the lysozomotropic agents chloroquine and monensin, which are known to inhibit processing of soluble antigens, washed extensively, and then incubated with autologous T cells in the absence of soluble anti-CD3, and3H-thymidine incorporation and CD25 expression were measured. Both monensin and chloroquine inhibited anti-CD3-pulsed monocyte-induced T-cell DNA synthesis and CD25 expression in a dose-dependent manner. This inhibitory effect was not due to any loss in cell viability or the effect on the expression of HLA-DR on monocytes. Paraformaldehyde-fixed monocytes pulsed with anti-CD3 MoAb induced significantly less DNA synthesis, HLA-DR expression, and CD25 antigen expression on autologous T cells as compared to responses induced by unfixed anti-CD3-pulsed monocytes. The treatment of anti-CD3-pulsed monocytes with frame-work-specific anti-HLA-DR MoAb inhibited their capacity to induce T-cell DNA synthesis. These data suggest that monocytes, in addition to serving as the matrix for cross-linking, also process anti-CD3 MoAb and present to the T cells in the context of HLA-DR antigens to induce optimal DNA synthesis.

Key words

T-cell activation antigen processing/presentation monensin chloroquine 


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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • Bharathi Vayuvegula
    • 1
  • Kiyoshi Ohira
    • 1
  • Sastry Gollapudi
    • 1
  • Sudhir Gupta
    • 1
  1. 1.Division of Basic and Clinical ImmunologyUniversity of CaliforniaIrvine

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