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- W323074089 abstract "The accessory cell (AC) signals involved in the activation of resting guinea pig T lymphocytes stimulated with mitogen (PHA), or the calcium ionophore, ionomycin (Ion) were examined. Activation of T cells was assessed by cell cycle analysis after acridine orange staining and /sup 3/H-thymidine incorporation. PHA-stimulated T cells depleted of all AC were unable to respond in the presence of phorbol myristate acetate (PMA), and/or interleukin 1 (IL 1). With suboptimal numbers of AC, PMA greatly augmented the number of T cells activated by PHA to enter and progress through the cell cycle, but only when present during the first few hours of culture. By contrast, IL 1 had little effect on the number of cells entering the cell cycle, although it enhanced S phase entry of the activated cells. IL 1 augmented DNA synthesis when added initially or later in culture. In contrast to the effects noted with PHA, PMA promoted activation and DNA synthesis of the majority of Ion stimulated cells in the complete absence of AC. IL 1 alone could not support Ion induced T cell activation although it enhanced T cell DNA synthesis in cultures stimulated by PMA and Ion. These studies indicate that intact AC,more » IL 1 and PMA-like signals play distinct roles in the progression of T cells through the initial cell cycle. Stimulation by Ion requires only PMA whereas PHA responses require intact AC and can be amplified by PMA. The major effect of IL 1 is to promote S phase entry of activated T cells.« less" @default.
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- W323074089 date "1986-03-05" @default.
- W323074089 modified "2023-09-23" @default.
- W323074089 title "Activation of resting T cells: distinct roles of intact accessory cells, phorbol myristate acetate and interleukin 1" @default.
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