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. 1992 Feb;75(2):382–385.

Glucocorticoids inhibit granulocyte-macrophage colony-stimulating factor-1 and interleukin-5 enhanced in vitro survival of human eosinophils.

M P Hallsworth 1, T M Litchfield 1, T H Lee 1
PMCID: PMC1384724  PMID: 1551701

Abstract

The effects of three corticosteroids, hydrocortisone, dexamethasone and methylprednisolone, on eosinophil survival enhanced by recombinant human granulocyte-macrophage colony-stimulating factor (rhGM-CSF) and recombinant murine interleukin-5 (rmIL-5) have been studied. Eosinophils were incubated at a concentration of 5 x 10(5) cells/ml in the presence of different concentrations of the three steroids with either rhGM-CSF (1 ng/ml) or rmIL-5 (50 U/ml). The eosinophils were cultured in the presence of the same concentrations of rhGM-CSF and rmIL-5 alone as a positive control and medium alone as a negative control. Viability was assessed after 7 days by trypan blue exclusion. All three steroids inhibited rhGM-CSF-enhanced eosinophil survival in a dose-dependent manner; the dose of these drugs producing 50% inhibition (IC50) was greater than 1.0 x 10(-4) M, 6.5 x 10(-6) M and 1.8 x 10(-6) M for hydrocortisone, dexamethasone and methylprednisolone, respectively. When eosinophils were cultured with the same concentration of rhGM-CSF in the presence of two non-glucocorticoids, beta-oestradiol and testosterone, neither of these steroids inhibited eosinophil survival over the concentration range 1 x 10(-10) M to 1 x 10(-4) M (n = 5). Dexamethasone and methylprednisolone, but not hydrocortisone, also inhibited eosinophil survival induced by rmIL-5 in a dose-dependent manner. These results suggest one mechanism for the efficacy of corticosteroids against eosinophil-related disorders.

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Selected References

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