Rifampicin is not an activator of the glucocorticoid receptor in A549 human alveolar cells.

It has recently been reported that rifampicin activates the glucocorticoid receptor and acts as an immunosuppressive drug. Because rifampicin constitutes an essential part of pulmonary tuberculosis therapy, we have examined whether it triggers glucocorticoid-like effects in alveolar cells. We have used reporter gene assays to measure the trans-activating and trans-repressing capacity of the glucocorticoid receptor after treating A549 human alveolar cells with rifampicin. The data show that rifampicin neither activated transcription from a promoter containing a glucocorticoid response element nor repressed the activity of activator protein 1 and nuclear factor kappaB, which are transcription factors involved in the immune response. In addition, rifampicin was also unable to inhibit the expression of an endogenous gene that contains activator protein 1 and nuclear factor kappaB response elements and encodes the proinflammatory cytokine RANTES (regulated upon activation normal T expressed and secreted protein). Finally, nuclear translocation of the glucocorticoid receptor, which occurs after ligand binding, was not triggered by rifampicin. In contrast, the glucocorticoid dexamethasone scored positive in all corresponding control experiments. In conclusion, rifampicin is not an activator of the glucocorticoid receptor in A549 alveolar cells. Our results support the clinical observation that rifampicin is not an immunosuppressive drug and suggest that the current medical practice concerning this antibiotic should not be changed.

• Publication year

  1999

• Venue

  Molecular Pharmacology

• Publication date

  1999-05-01

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0026-895x(24)23180-1PMID 10220562
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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