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STAT5A Modulates Chemokine Receptor CCR6 Expression and Enhances Pre-B Cell Growth in a CCL20-Dependent Manner

Tatsuaki Tsuruyama1,2, Takuya Hiratsuka3, Wulamujiang Aini4

  • 1Department of Diagnostic Pathology, Kyoto University Hospital, 54 Shogoin-Kawaharacho, Sakyo-ku, Kyoto, 606-8397, Japan. tsuruyam@kuhp.kyoto-u.ac.jp.

Journal of Cellular Biochemistry
|March 29, 2016
PubMed

Insights

Signal transducer and activator of transcription 5A (STAT5A) enhances pre-B cell responses to CCL20 by upregulating C-C motif receptor 6 (CCR6) transcription, promoting innate immunity and cell growth.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Signal transducer and activator of transcription 5A (STAT5A) is known to mediate B-cell responses to cytokines via SOCS genes.
  • The specific role of STAT5A in B-cell responses to chemokines remains largely unexplored.
  • Understanding STAT5A's function in chemokine signaling is crucial for innate immunity research.

Purpose of the Study:

  • To investigate the direct role of STAT5A in the innate immune response of B cells to chemokines.
  • To elucidate the mechanism by which STAT5A influences B-cell responses to chemokines.
  • To determine the correlation between STAT5A activity, CCR6 expression, and B-cell proliferation in inflammatory conditions.

Main Methods:

  • Analysis of STAT5A's transcriptional activity on the CCR6 promoter in pre-B cells.
  • Investigation of STAT5A binding to the interferon-γ activation site (GAS) element within the CCR6 promoter.
  • Assessment of CCL20-dependent pre-B cell colony growth in relation to STAT5A and CCR6 levels.
  • Correlation analysis of STAT5A phosphorylation and CCR6 expression in human B-lymphoblastic lymphoma with inflammation.

Main Results:

  • STAT5A was found to upregulate C-C motif receptor 6 (CCR6) transcription, thereby mediating responses to its ligand, CCL20.
  • STAT5A exerts its transcriptional activity through binding to the GAS element in the CCR6 promoter of pre-B cells.
  • Elevated levels of STAT5A and CCR6 were associated with increased CCL20-dependent colony growth of pre-B cells.
  • A positive correlation was observed between STAT5A phosphorylation and CCR6 expression in human B-lymphoblastic lymphoma cases with inflammation.

Conclusions:

  • STAT5A plays a significant role in enhancing pre-B cell responses to the chemokine CCL20.
  • The mechanism involves STAT5A-mediated upregulation of CCR6 transcription.
  • These findings support the hypothesis that STAT5A promotes pre-B cell growth through the CCL20/CCR6 axis in innate immunity.
Keywords:
C-C MOTIF RECEPTOR 6CHEMOKINE (C-C MOTIF) LIGAND 20PRE-B CELLSIGNAL TRANSDUCER AND ACTIVATOR OF TRANSCRIPTION 5A

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