Cited by 56Immunotherapy and Immune ResponsesGenomics and Chromatin DynamicsT-cell and B-cell Immunology

Role of PU.1 in MHC class II expression through transcriptional regulation of class II transactivator pI in dendritic cells

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Kitamura, Nao, Yokoyama, Hokuto, Yashiro, Takuya, Nakano, Nobuhiro, Nishiyama, Makoto, Kanada, Shunsuke, Fukai, Tatsuo, Hara, Mutsuko +4 more·2012·Journal of Allergy and Clinical Immunology

Abstract

Background PU.1 is a hematopoietic cell-specific transcription factor belonging to the Ets family. We hypothesized that PU.1 is involved in MHC class II expression in dendritic cells (DCs). Objective The role of PU.1 in MHC class II expression in DCs was analyzed. Methods Transcriptional regulation of the DC-specific pI promoter of the class II transactivator (CIITA) gene and subsequent MHC class II expression was investigated by using PU.1 small interfering RNA (siRNA) and reporter, chromatin immunoprecipitation, and electrophoretic mobility shift assays. Results PU.1 siRNA introduction suppressed MHC class II expression, allogeneic and syngeneic T-cell activation activities of bone marrow-derived DCs (BMDCs) with reduction of CIITA mRNA driven by the DC-specific promoter pI, and MHC class II mRNA. The chromatin immunoprecipitation assay showed constitutive binding of PU.1 to the pI region in BMDCs, whereas acetylation of histone H3 on pI was suppressed by LPS stimulation in parallel with shutdown of CIITA transcription. PU.1 transactivated the pI promoter through cis-elements at -47/-44 and -30/-27 in a reporter assay and to which PU.1 directly bound in an electrophoretic mobility shift assay. Acetylation of histones H3 and H4 on pI was reduced in PU.1 siRNA-introduced BMDCs. Knockdown of interferon regulatory factor 4 or 8, which is a heterodimer partner of PU.1, by siRNA did not affect pI-driven CIITA transcription or MHC class II expression. Conclusion PU.1 basally transactivates the CIITA pI promoter in DCs by functioning as a monomeric transcription factor and by affecting histone modification, resulting in the subsequent expression and function of MHC class II.

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  • PU.1 regulates numerous gene programs associated with host defense and immune function, including expression of MHC and costimulatory genes, as well as immune checkpoints and immune effector genes.

    “PU.1 regulates numerous gene programs associated with host defense and immune function, including expression of MHC and costimulatory genes, as well as immune checkpoints and immune effector genes (Fisher et al., 1998; Karpurapu et al., 2011; Kitamura et al., 2012; Keightley et al., 2017).”

    From PU.1 is required to restrain myelopoiesis during chronic inflammatory stress (2023) · cites this paper as Kitamura et al., 2012

    The paper’s Abstract (page not provided) reports that PU.1 regulates CIITA pI and subsequent MHC class II expression in dendritic cells. It also describes prior work identifying PU.1 as a regulator of the costimulatory genes CD80 and CD86. Our copy does not support attributing regulation of immune checkpoint or immune effector genes to this paper. (LLM, conf=0.88)

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  1. REFERENCES E1. Ito T, Nishiyama C, Nakano N, Nishiyama M, Usui Y, Takeda K, et al. Roles of PU.1 in monocyte-and mast cell-specific gene regulation: PU.1 transactivates CIITA pIV in cooperation with IFN-gamma. Int Immunol 2009;21:803-16.

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Authors
Kitamura, N., Yokoyama, H., Yashiro, T., Nakano, N., Nishiyama, M., Kanada, S., Fukai, T., Hara, M., Ikeda, S., Ogawa, H., Okumura, K., & Nishiyama, C.
Affiliations
  • Juntendo University (JP)
  • The University of Tokyo (JP)
Corresponding author
Nishiyama, Chiharu
Venue
Journal of Allergy and Clinical Immunology
Publisher
Elsevier BV
Published
2012-03
Volume
129
Issue
3
Pages
814-824.e6
ISSN
0091-6749 (ISSN-L)
OpenAlex
W1974505259
Cited by
55
References
37
Citations by year
2026: 3 · 2025: 2 · 2024: 5 · 2023: 4 · 2022: 1 · 2021: 4 · 2020: 9 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 3 · 2015: 7 · 2014: 3 · 2013: 2 · 2012: 2
FWCI
0.93
Type
journal article
Language
en
Open access
Locations
  • Journal of Allergy and Clinical Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Ministry of Education, Culture, Sports, Science and Technology
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • 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
Keywords
PU.1, MHC class II expression, dendritic cells, transcriptional regulation, histone acetylation, histone modifications, ETS transcription factors, IRF4, IRF8, T cell activation, bone marrow-derived dendritic cells, promoter cis-acting elements
MeSH terms
Proto-Oncogene Protein Spi-1, Acetylation, Animals, Histocompatibility Antigens Class II, Bone Marrow Cells, Cells, Cultured, Dendritic Cells, Gene Expression Regulation, Histones, Lymphocyte Activation, Mice, Inbred BALB C, Mice, Inbred C57BL, Nuclear Proteins, Promoter Regions, Genetic, Proto-Oncogene Proteins, T-Lymphocytes, Transcriptional Activation, Trans-Activators, RNA, Small Interfering, Mice

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