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  • Title: Differentiating the roles of STAT5B and STAT5A in human CD4+ T cells.
    Author: Jenks JA, Seki S, Kanai T, Huang J, Morgan AA, Scalco RC, Nath R, Bucayu R, Wit JM, Al-Herz W, Ramadan D, Jorge AA, Bacchetta R, Hwa V, Rosenfeld R, Nadeau KC.
    Journal: Clin Immunol; 2013 Aug; 148(2):227-36. PubMed ID: 23773921.
    Abstract:
    STAT5A and STAT5B are highly homologous proteins whose distinctive roles in human immunity remain unclear. However, STAT5A sufficiency cannot compensate for STAT5B defects, and human STAT5B deficiency, a rare autosomal recessive primary immunodeficiency, is characterized by chronic lung disease, growth failure and autoimmunity associated with regulatory T cell (Treg) reduction. We therefore hypothesized that STAT5A and STAT5B play unique roles in CD4(+) T cells. Upon knocking down STAT5A or STAT5B in human primary T cells, we found differentially regulated expression of FOXP3 and IL-2R in STAT5B knockdown T cells and down-regulated Bcl-X only in STAT5A knockdown T cells. Functional ex vivo studies in homozygous STAT5B-deficient patients showed reduced FOXP3 expression with impaired regulatory function of STAT5B-null Treg cells, also of increased memory phenotype. These results indicate that STAT5B and STAT5A act partly as non-redundant transcription factors and that STAT5B is more critical for Treg maintenance and function in humans.
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