Constitutive activation of STAT5A and STAT5B regulates IgM secretion in Waldenström's macroglobulinemia

Lucy S. Hodge, Steven C. Ziesmer, Zhi Zhang Yang, Frank J. Secreto, Anne J. Novak, Stephen M. Ansell

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Activation of the Janus kinase family/signal transducer and activator of transcription (JAK/STAT) signaling pathway has been associated with the pathogenesis and progression of both solid and hematologic malignancies. We have detected constitutive activation of STAT5 in malignant B cells derived from patients with Waldenström's macroglobulinemia (WM). Although short hairpin RNA-mediated knockdown of the STAT5A and STAT5B isoforms did not affect cellular proliferation, loss of STAT5 significantly decreased immunoglobulin M (IgM) secretion. A similar dose-dependent inhibition of IgM secretion was observed when WM cell lines were treated with a small molecule inhibitor of STAT5. These data suggest that STAT5 is involved in regulating IgM production in WM and that inhibition of STAT5 may represent a novel therapeutic strategy for lowering IgM levels in WM patients.

Original languageEnglish (US)
Pages (from-to)1055-1058
Number of pages4
Issue number7
StatePublished - Feb 13 2014

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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