Cited by 156T-cell and B-cell ImmunologyNF-κB Signaling PathwaysImmune Response and Inflammation

Cutting Edge: Essential Role of Phospholipase C-γ2 in B Cell Development and Function

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Hashimoto, Ari, Takeda, Kiyoshi, Inaba, Muneo, Sekimata, Masayuki, Kaisho, Tsuneyasu, Ikehara, Susumu, Homma, Yoshimi, Akira, Shizuo +1 more·2000·The Journal of Immunology

Abstract

Cross-linking of the B cell Ag receptor (BCR) induces the tyrosine phosphorylation of multiple cellular substrates, including phospholipase C (PLC)-γ2, which is involved in the activation of the phosphatidylinositol pathway. To assess the importance of PLC-γ2 in murine lymphopoiesis, the PLC-γ2 gene was inducibly ablated by using IFN-regulated Cre recombinase. Mice with a neonatally induced loss of PLC-γ2 function displayed reduced numbers of mature conventional B cells and peritoneal B1 cells and defective responses in vitro to BCR stimulation and in vivo to immunization with thymus-independent type II Ags. In contrast, T cell development and TCR-mediated proliferation were normal. Taken together, PLC-γ2 is a critical component of BCR signaling pathways and is required to promote B cell development.

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Crossref · 10.4049/jimmunol.165.4.1738

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  • PLCγ2 is highly expressed in hematopoietic cells and has a key role in signalling downstream of ITAM-associated receptors, controlling B cell and innate immune cell functions in response to BCR and FcR stimulation.

    “PLCγ2, highly expressed in hematopoietic cells, has the key role in signalling downstream of ITAM-associated receptors; for example, it controls multiple functions of B cells, and several types of innate immune cells in response to stimulation of the B-cell antigen receptor (BCR) and Fc receptors (FcRs), respectively [41,42].”

    From Phosphatidylinositol(4,5)bisphosphate: diverse functions at the plasma membrane (2020) · cites this paper as [42]

    The Discussion reports that PLCγ2 is a critical component of BCR signaling, and the Results show impaired B-cell responses to BCR stimulation when PLCγ2 is lost (page numbers unavailable in our copy). The cited paper does not establish the claim about high expression across hematopoietic cells, ITAM-associated receptors generally, or FcR-stimulated innate immune cell functions. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • PLCγ2-deficient and inducible PLCγ2−/− mice lack the ability to respond to antigens.

    “Indeed, PLCγ2-deficient and inducible PLCγ2−/− mice have been widely shown to lack the ability to respond to antigens (24, 26, 27, 28).”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [26]

    The Results report reduced IgM responses to both T-independent and T-dependent antigens in inducible PLCγ2-mutant mice. They do not support a complete inability to respond: T-dependent IgG responses were comparable to controls. This paper tests inducible mutants, not a separate group of constitutively PLCγ2-deficient mice. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Microglia activation of Plcg2 might regulate intracellular calcium release, as shown for B cells, and contribute to modulation of specific immune responses such as phagocytosis, migration, proliferation, and survival.

    “In the brain, microglia activation of Plcg2 might regulate intracellular calcium release, as shown for B cells [12, 45], and contribute to the modulation of specific immune responses such as phagocytosis, migration, proliferation, and survival.”
  • In the absence of PLCγ2, T cell development and TCR-mediated proliferation are normal, with development instead depending on PLCγ1.

    “Inducible KO mice showed T cell development and T cell receptor (TCR)-mediated proliferation were normal in the absence of PLCγ2 (24, 26), with development instead depending on the closely related family member PLCγ1 (60).”

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Authors
Hashimoto, A., Takeda, K., Inaba, M., Sekimata, M., Kaisho, T., Ikehara, S., Homma, Y., Akira, S., & Kurosaki, T.
Affiliations
  • Kansai Medical University (JP)
  • Research Institute for Microbial Diseases, The University of Osaka (JP)
  • Fukushima Medical University (JP)
Corresponding author
  • Hashimoto, Ari
  • Kurosaki, Tomohiro
Venue
The Journal of Immunology
Published
2000-08
Volume
165
Issue
4
Pages
1738-1742
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2153410622
Cited by
155
References
24
Citations by year
2026: 1 · 2025: 3 · 2024: 2 · 2023: 4 · 2022: 3 · 2021: 6 · 2020: 3 · 2019: 5 · 2018: 1 · 2017: 2 · 2016: 6 · 2015: 4 · 2014: 4 · 2013: 6 · 2012: 6
FWCI
4.24
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
PLCγ2, B cell development, B cell receptor signaling, lymphocyte development, phosphatidylinositol pathway, tyrosine phosphorylation, thymus-independent antigens, Cre recombinase, T cell development
MeSH terms
Animals, Antigens, Surface, Antigens, T-Independent, B-Lymphocytes, Calcium, Cell Differentiation, Ficoll, Haptens, Hemocyanins, Immunoglobulin M, Isoenzymes, Lymphocyte Activation, Type C Phospholipases, T-Lymphocytes, Trinitrobenzenes, Lymphocyte Subsets, Gene Deletion, Mice, Knockout, Mice, Phospholipase C gamma

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