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- W2401743815 abstract "We have investigated the sequence of signals provided by a B- and null-cell-derived prothymocyte-differentiating activity (PTDA), phytohemagglutinin (PHA), and interleukin 2 (IL2) to the generation of mature T-lymphocytes by T-depleted bone marrow (BM) cells. Sequential studies show that preincubation of CD2-, CD3-, CD4-, CD6-, and CD8- BM cells with PTDA, but not with recombinant (r) IL2 or PHA increased their capacity to proliferate in liquid culture and to form agar T-cell colonies provided both PHA and rIL2 were added to the cultures. In contrast, the growth of T-cell-containing BM was significantly enhanced in both liquid and agar culture following its preincubation with rIL2 as well as with PTDA. The selective effect of PTDA on CD2-, CD3-, CD4-, CD6-, CD8- BM cells was abolished by adding a CD7 monoclonal antibody to the T-cell-purging coctail. Cell marker studies performed on T-cell-depleted BM-derived liquid or agar cultures have shown that they contain up to 70%-85% CD2+, CD3+, CD4+, CD8- cells. No IL1 or IL2 could substitute for PTDA, nor have these activities, as well as interferon (IFN), IL3, IL4, or granulocyte-macrophage colony-stimulating activity (GM-CSA) been detected so far in PTDA-containing preparations. These results indicate that PTDA can trigger marrow T-cell precursors into PHA-responsive T cells, which, following activation by PHA, require IL2 for growth. It is suggested that this may represent a thymus-independent alternative pathway for T-cell differentiation and activation." @default.
- W2401743815 created "2016-06-24" @default.
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- W2401743815 date "1989-08-01" @default.
- W2401743815 modified "2023-09-25" @default.
- W2401743815 title "Signal requirements for the generation of T-lymphocytes from T-depleted bone marrow cells: a sequential study." @default.
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