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The Journal of Immunology, Vol 133, Issue 3 1230-1234, Copyright © 1984 by American Association of Immunologists

ARTICLES

Activated T cells in vivo and in vitro: divergence in expression of Tac and Ia antigens in the nonblastoid small T cells of inflammation and normal T cells activated in vitro

GR Burmester, B Jahn, M Gramatzki, J Zacher and JR Kalden

Elevated numbers of non-blastoid T cells expressing either the Tac or Ia antigens were found on separate cell populations in inflammatory synovial tissues and fluids of individuals with arthritis. Those synovial T cell preparations containing Tac+ cells exhibited marked proliferation upon the addition of IL 2 without concomitant mitogen stimulation; T cell eluates containing Ia+ but not Tac+ T cells did not show significantly increased levels of blastogenesis. Paired T cell preparations from blood had only minor increases in the number of Tac+ T cells and moderate increases in the number of Ia+ cells. The blood cells did not exhibit significant proliferation to IL 2. In contrast mitogen or allogeneic activation of T cells induced blastoid cells that expressed abundant per cell amount of Ia or Tac antigens. These blastoid cells resembled the small T cells of inflammation in having only very limited overlap between the population that bore Ia antigens and those with the Tac antigen; however, there was a preponderance of Tac-bearing cells.


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