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α (p55) and β(p75) chains of the interleukin-2 receptor are expressed by AML blasts

Leukemia, ISSN: 0887-6924, Vol: 7, Issue: 3, Page: 418-425
1993
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Article Description

In the present study, we have investigated the leukemic cells obtained from 16 patients with acute myeloid leukemia (AML) at diagnosis for the membrane expression of p55 (α) and p75 (β) interleukin-2 receptor (IL-2R) chains using specific monoclonal antibodies (mAbs), as well as for the presence of their transcripts using Northern blot analysis. In addition, immunoprecipitation of the p75 membrane molecule with TU27 and Mik-β1 mAbs was carried out in selected cases. The p75 IL-2Rβ transcripts were detected in all cases, whereas the membrane p75 molecule was demonstrable by flow cytometry in three cases. However, data from the immunoprecipitation analysis suggest that the lack of the p75 IL-2R detection by flow cytometry might be caused by the low density of molecules per cell rather than the fact that the specific mRNA is not translated into the p75 surface molecule. In addition, a consistent membrane positivity with an anti-p55/CD25 mAb, present on fresh uncultured blasts in 37.5% of the cases, became detectable after short-term culture in 75% of cases. In each individual case, a strict correlation was found between membrane CD25 reactivity and the expression of p55 mRNA. Taken together, our data suggest that the expression of both α (p55) and β (p75) IL-2R molecules is a common feature of leukemic cells in AML, and provide new arguments for reassessing the possible role of IL-2 in leukemic growth.

Bibliographic Details

Giovanni Pizzolo; Antonella Rigo; Roberta Zanotti; Fabrizio Vinante; Carlo Vincenzi; Giuseppe Perona; Marco Cassatella; Giuseppe Carra; Massimo Libonati; Giancarlo Castaman; Marco Chilosi; Gianpietro Semenzato; Renato Zambello; Livio Trentin

Medicine; Biochemistry, Genetics and Molecular Biology

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