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J Biol Chem. 1995 Jul 7;270(27):15942-5.

Interleukin-3, erythropoietin, and prolactin activate a STAT5-like factor in lymphoid cells.

Author information

1
U363 INSERM, Institut Cochin de Génétique Moléculaire, Hopital Cochin, Paris, France.

Abstract

Interleukin-3 (IL-3)-, erythropoietin (EPO)-, and prolactin (PRL)-induced signal transduction via the JAK/STAT pathway was studied in the IL-3-dependent BAF-3 lymphoid cell line. Transfected cells expressing either the long form of the PRL receptor or the EPO receptor were used. We demonstrated that IL-3, EPO, and PRL activated a transcription factor related to the mammary transcription factor STAT5 but not to STAT1, -2, -3, or -4 as opposed to interferon gamma (IFN gamma) which activated STAT1 in the same cells. Similarly, PRL and EPO activated a STAT5-like factor (STAT5-L) in the rat Nb2 and the human UT7 cells expressing endogenous PRL and EPO receptors, respectively. The hematopoietic STAT5-L activated by IL-3, EPO, or PRL was identified as a 97-kDa tyrosine-phosphorylated protein. These results confer to STAT5 a much broader role than previously suggested.

PMID:
7608147
DOI:
10.1074/jbc.270.27.15942
[Indexed for MEDLINE]
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