Cited by 53Genomics and Chromatin DynamicsT-cell and B-cell ImmunologyProtein Kinase Regulation and GTPase Signaling

AKT Induces Transcriptional Activity of PU.1 through Phosphorylation-mediated Modifications within Its Transactivation Domain

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Rieske, Piotr, Pongubala, JaganM.R.·2001·Journal of Biological Chemistry

Abstract

Signal transduction by the antigen receptor complexes is critical for developmental progression of B-lymphocytes, which are defined by assembly and sequential expression of immunoglobulin genes, which in turn are regulated by the enhancer elements. Although proximal antigen-receptor signal transduction pathways are well defined, the precise nuclear factors targeted by these signals remained unknown. Previous studies have demonstrated that tissue-restricted transcription factors including PU.1 and PU.1 interaction partner (PIP) function synergistically with c-Fos plus c-Jun to stimulate the kappaE3'-enhancer in 3T3 cells. In this study, we demonstrate that the functional synergy between these factors is enhanced in response to mitogen-activated protein kinase kinase kinase, in 3T3 cells, where the enhancer is inactive. However in S194 plasmacytoma cells, mitogen-activated protein kinase kinase kinase was able to stimulate the activity of PU.1 but unable to induce the kappaE3'-enhancer activity. We have found that Ras-phosphoinositide 3-kinase-dependent externally regulated kinase, AKT, induces kappaE3'-enhancer activity in both pre-B and plasmacytoma cells. AKT stimulation of the kappaE3'-enhancer is primarily due to PU.1 induction and is independent of PU.1 interaction with PIP. Activation of AKT had no effect on the expression levels of PU.1 or its protein-protein interaction with PIP. Using a series of deletion constructs, we have determined that the PU.1 acid-rich (amino acids 33-74) transactivation domain is necessary for AKT-mediated induction. Substitution analyses within this region indicate that phosphorylation of Ser(41) is necessary to respond to AKT. Consistent with these studies, ligation of antigen receptors in A20 B cells mimics AKT activation of PU.1. Taken together, these results provide evidence that PU.1 is induced by AKT signal in a phosphoinositide 3-kinase-dependent manner, leading to inducible or constitutive activation of its target genes.

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Authors
Rieske, P., & Pongubala, J. R.
Affiliations
Hahnemann University Hospital (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-03
Volume
276
Issue
11
Pages
8460-8468
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2010002487
Cited by
53
References
87
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 2 · 2020: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 1 · 2013: 2
FWCI
1.76
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
Akt, PU.1, transactivation domain, phosphatidylinositol 3-kinase, antigen receptor signaling, B cell development, pre-B cells, plasmacytoma cells
MeSH terms
Interferon Regulatory Factor-4, Proto-Oncogene Protein Spi-1, Animals, DNA, DNA-Binding Proteins, Enhancer Elements, Genetic, Phosphorylation, Proto-Oncogene Proteins, Receptors, Antigen, B-Cell, Transcription, Genetic

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