Abstract
Lipopolysaccharide (LPS) can induce monocytes to produce various cytokines such as tumor necrosis factor α (TNFα) and interleukin 1β (IL-1β). In the present study, the kinetics of both intracellular and extracellular accumulation of TNFα and IL-1β in LPS stimulated mononuclear cell (MNC) cultures has been determined. A three-color-immunofluorescence technique was used to detect intracellular accumulation of cytokines. Intracellular accumulation of TNFα in monocytes starts shortly after initiation of the culture; i.e., TNFα is detectable after 1 h, reaching a peak level after 3–4 hours with 50–65% of monocytes staining positive. In parallel with its increased intracellular presence, TNFα was also found in the culture supernatant. The intracellular accumulation of IL-1β in monocytes became detectable after 2 h of culture in the presence of LPS. After 4 h, a plateau was reached, with 90% of the monocytes being positive. In parallel, but with a little delay, IL-1β could be detected in the culture supernatnant. TNFα and IL-1β can be produced simultaneously in the same monocytes as was shown by a three-color-immunofluorescence technique. It is concluded that TNFα and IL-1β are good parameters for the early measurement of monocyte activation and that both the intracellular accumulation in monocytes and the amount of secreted cytokines can be used for such a purpose. The intracellular accumulation in monocytes can be measured by the three-color-immuno-fluorescence technique described.
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de Bont, E.S.J.M., Niemarkt, A.E., Tamminga, R.Y.J. et al. Lipopolysaccharide-induced cytokine production in peripheral blood mononuclear cells: intracellular localization of tumor necrosis factor α and interleukin 1β detected with a three-color immunofluorescence technique. Histochem Cell Biol 106, 593–598 (1996). https://doi.org/10.1007/BF02473275
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DOI: https://doi.org/10.1007/BF02473275