Activation and proliferation of normal resting human T lymphocytes in serum-free culture: role of IL-4 and IL-6 - PubMed (original) (raw)
Activation and proliferation of normal resting human T lymphocytes in serum-free culture: role of IL-4 and IL-6
D Habetswallner et al. Immunology. 1988 Nov.
Abstract
Purified human T lymphocytes, completely depleted of accessory cells [i.e. monocytes, large granular lymphocytes (LGL) and B lymphocytes], have been grown in serum-free culture in presence of a mitogenic lectin (phytohaemagglutinin, PHA) and different recombinant cytokines. Only IL-2 and IL-4 induced a marked stimulation of [3H] thymidine ([3H]TdR) uptake, cell proliferation and expression of activation markers [transferrin receptor (TrfR), IL-2R]. The other cytokines (IL-1 alpha, IL-1 beta, IFN-gamma, GM-CSF, TNF-alpha) had no significant effect, except for a moderate, but significant, stimulation of [3H]TdR uptake induced by IL-3. Simultaneous addition of IL-4 and anti-IL-2 neutralizing monoclonal antibodies (mAb) did not modify the effects induced by IL-4 alone. Furthermore, IL-2 was not detected in the supernatant of T cells grown in the presence of PHA and IL-4. Thus, our results indicate that IL-4 acts on T lymphocytes independently of IL-2. We also observed that IL-6 moderately activates DNA synthesis in PHA-stimulated T lymphocytes, but markedly potentiates the proliferative effect of suboptimal amounts of IL-2. In conclusion, the present study suggests that B-cell growth factors, in addition to IL-2, control the proliferation of normal circulating T lymphocytes.
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