Mechanisms of Allergy
Retinoic acid modulates IL-5 receptor expression and selectively inhibits eosinophil-basophil differentiation of hemopoietic progenitor cells,☆☆,

https://doi.org/10.1067/mai.2002.121527Get rights and content

Abstract

Background: IL-5 plays a central role in eosinophil and basophil differentiation, exerting its effects through the IL-5 receptor (IL-5Rα). Currently, little is known concerning regulation of IL-5Rα expression in the context of commitment of hemopoietic progenitor cells to the eosinophil and basophil lineages. Objective: Because all-trans retinoic acid (ATRA) is known to modulate some aspects of hemopoietic differentiation, we examined the effects of ATRA on eosinophil-basophil differentiation and IL-5Rα expression. Methods: Progenitor cells were obtained from bone marrow aspirates and cord blood samples. Enriched populations of CD34+ cells were isolated by means of positive immunomagnetic selection with MACS beads. Results: In semisolid methylcellulose cultures of normal human bone marrow, ATRA (10−6 mol/L) selectively suppressed eosinophil-basophil colony-forming units but had no effect on granulocyte-macrophage colony-forming units. Similarly, ATRA (10−6 mol/L) inhibited eosinophil-basophil differentiation of cord blood CD34+ cells in liquid culture, whereas neutrophil differentiation proceeded without impediment. Most importantly, these effects of ATRA (10−8 to 10−6 mol/L) on CD34+ cells were associated with a dose-dependent inhibition of IL-5Rα but no change in GM-CSF receptor expression, as detected with flow cytometry. Conclusions: These findings indicate that retinoids can differentially regulate expression of IL-5Rα, but not GM-CSF receptor, and that these effects have functional consequences in vitro on eosinophil and basophil differentiation. (J Allergy Clin Immunol 2002;109:307-13.)

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Materials

Materials were purchased as follows: Lymphoprep was obtained from NycoMed Pharma AS; McCoys 5A medium, penicillin, streptomycin, and FCS were obtained from Gibco BRL; heparin, dextran (molecular weight, 260,000 kD), sodium azide, ATRA, and paraformaldehyde were obtained from Sigma Aldrich Canada; 2-mercaptoethanol was obtained from BDH Inc; recombinant IL-3, IL-5, and GM-CSF were obtained from Pharmingen Canada; and methylcellulose (Methocel A4M premium) was obtained from Dow Chemicals. The

ATRA selectively inhibits eosinophil-basophil CFUs

In initial experiments sternal bone marrow samples were obtained preoperatively from patients undergoing cardiac surgery, and CFUs were enumerated in 14-day methylcellulose-based assays, with Mo-conditioned medium as a source of GM-CSF. Data are expressed as CFUs per 2.5 × 105 nonadherent bone marrow cells. As shown in Fig 1, ATRA (10−6 mol/L) reduced eosinophil-basophil CFUs from 21 ± 5.9 to 9.25 ± 2.7 colonies (P < .05), associated with no significant change in the proportion of

Discussion

Our findings demonstrate that ATRA has the ability to selectively inhibit eosinophil-basophil differentiation and surface expression of IL-5Rα by hemopoietic progenitor cells in vitro. First, ATRA suppressed bone marrow eosinophil-basophil CFUs but had no effect on granulocyte-macrophage CFUs (Fig 1). Second, ATRA suppressed eosinophil-basophil differentiation of CD34+ cord blood cells in long-term liquid culture, whereas neutrophil differentiation proceeded without impediment (Table I).

Acknowledgements

We thank Dr A. Lopez (Adelaide, Australia) for generous provision of antibodies, A. Verhee (Ghent, Belgium) for technical assistance, and Lynne Larocque for excellent help in manuscript preparation.

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    *Dr Upham is currently affiliated with the University Department of Medicine, QE2 Medical Centre, Nedlands, Australia.

    ☆☆

    Supported by grants from the Medical Research Council of Canada. J.W.U. is the recipient of a Neil Hamilton Fairley Fellowship (#967211) from the National Health & Medical Research Council of Australia.

    Reprint requests: Judah A. Denburg, MD, Department of Medicine, HSC 3V46, McMaster University, 1200 Main St West, Hamilton, Ontario L8N 3Z5, Canada.

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