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Antimicrobial Agents and Chemotherapy, 04 1996, 934-940, Vol 40, No. 4
M Kloppenburg, BM Brinkman, HH de Rooij-Dijk, AM Miltenburg, MR Daha, FC Breedveld, BA Dijkmans and C Verweij
Minocycline is a tetracycline derivative that has beneficial effects in
noninfectious forms of arthritis and dermatitis. To investigate whether
this effect may be attributed to interference with cytokine production, we
studied the effect of minocycline on cytokine production by T cells and
monocytes. Minocycline exerted an inhibitory effect on tumor necrosis
factor alpha (TNF-alpha) and gamma interferon production by stimulated T
cells, whereas the production of interleukin 6 (IL-6) remained unaffected.
The effect of minocycline on TNF-alpha mRNA synthesis by T cells was shown
to be stimulus specific. T cells stimulated by a Ca2+-independent mode
exhibited a decrease in TNF-alpha mRNA in the presence of minocycline,
whereas the TNF-alpha mRNA level remained unaffected by minocycline when
cells were stimulated in a Ca2+- dependent manner. In contrast to the
effect on T cells, addition of minocycline to lipopolysaccharide-stimulated
monocytes led to a dose- dependent increase in TNF-alpha and IL-6
production which was paralleled by an enhancement of TNF-alpha mRNA
synthesis. These results indicate that minocycline exerts differential
effects on the regulation of cytokine production by T cells and monocytes
that are partly reflected at the mRNA level. Given the pleiotropic effects
of minocycline, it is suggested that the immunostimulatory effect on
monocytes might counteract its beneficial properties in the treatment of
several forms of chronic inflammation.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
The tetracycline derivative minocycline differentially affects cytokine production by monocytes and T lymphocytes
Department of Rheumatology, University Hospital, Leiden, The Netherlands.
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