Cited by 68Immune Response and InflammationImmunotherapy and Immune ResponsesNF-κB Signaling Pathways

Peptidoglycan and lipopolysaccharide activate PLCγ2, leading to enhanced cytokine production in macrophages and dendritic cells

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Aki, Daisuke, Minoda, Yasumasa, Yoshida, Hideyuki, Watanabe, Satoko, Yoshida, Ryoko, Takaesu, Giichi, Chinen, Takatoshi, Inaba, Toshiya +4 more·2008·Genes to Cells

Abstract

In macrophages and monocytes, microbial components trigger the production of pro‐inflammatory cytokine through Toll‐like receptors (TLRs). Although major TLR signaling pathways are mediated by serine/threonine kinases, including TAK1, IKK and MAP kinases, tyrosine phosphorylation of intracellular proteins by TLR ligands has been suggested in a number of reports. Here, we demonstrated that peptidoglycan (PGN) of a Gram‐positive bacterial cell wall component, a TLR2 ligand and lipopoysaccharide (LPS) of a Gram‐positive bacterial component, a TLR4 ligand induced tyrosine phosphorylation of phospholipase Cγ‐2 (PLCγ2), leading to intracellular free Ca 2+ mobilization in bone marrow‐derived macrophages (BMMφ) and bone marrow‐derived dendritic cells (BMDC). PGN‐ and LPS‐induced Ca 2+ mobilization was not observed in BMDC from PLCγ2 knockout mice. Thus, PLCγ2 is essential for TLR2 and TLR4‐mediated Ca 2+ flux. In PLCγ2‐knockdown cells, PGN‐induced IκB‐α phosphorylation and p38 activation were reduced. Moreover, PLCγ2 was necessary for the full production of TNF‐α and IL‐6. These data indicate that the PLCγ2 pathway plays an important role in bacterial ligands‐induced activation of macrophages and dendritic cells.

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Crossref · 10.1111/j.1365-2443.2007.01159.x

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  • PLCγ2 is required after peptidoglycan/TLR2 and LPS/TLR4 stimulation to induce normal levels of TNF-α and IL-6 in bone marrow-derived macrophages and dendritic cells.

    “The use of BM-derived macrophages and DCs from PLCγ2 KO mice showed that PLCγ2 was required after peptidoglycan/TLR2 and LPS/TLR4 stimulation to induce normal levels of TNF-α and IL-6 (84).”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [84]

    The cytokine-production results section reports reduced TNF-α and IL-6 after PGN stimulation of PLCγ2-deficient bone marrow-derived macrophages, with a similar reduction after LPS stimulation. It suggests the requirement extends to dendritic cells, but the Introduction describes the knockout dendritic-cell finding as impaired calcium mobilization, not a direct cytokine-production measurement. The claim overstates what the knockout dendritic-cell experiments showed. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • PLCγ2 activation leads to an increase in cytoplasmic calcium, that supports the assembly of the NLRP3 inflammasome, and pro-inflammatory cytokine release in human blood monocytes, bone-marrow-derived macrophages and dendritic cells.

    “PLCγ2 activation leads to an increase in cytoplasmic calcium, that supports the assembly of the pyrin (PYD)-domain-containing protein 3 (NLRP3) inflammasome, and pro-inflammatory cytokine release in human blood monocytes [31], bone-marrow-derived macrophages (BMDM) and dendritic cells [32].”

    From TREM2/PLCγ2 signalling in immune cells: function, structural insight, and potential therapeutic modulation (2021) · cites this paper as [32]

    The Discussion and results report that PLCγ2 contributes to intracellular calcium mobilization in bone-marrow-derived macrophages and dendritic cells, and that it is required for full pro-inflammatory cytokine production. The paper does not link this calcium response to NLRP3 inflammasome assembly. Human blood monocytes are attached to a different citation in the citing sentence, so they are not assessed here. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • PLCγ2 activation in microglia, monocyte/macrophages, dendritic and mast cells has been linked to increased cytokine production.

    “PLCγ2 activation in microglia, monocyte/macrophages, dendritic and mast cells has been linked to increased cytokine production [32, 35]”

    From TREM2/PLCγ2 signalling in immune cells: function, structural insight, and potential therapeutic modulation (2021) · cites this paper as [32]

    The Introduction and the section on TLR2–PLCγ2 signaling link PLCγ2 to TNF-α and IL-6 production in macrophages and dendritic cells after bacterial-ligand stimulation (page numbers unavailable). Our copy does not establish the same PLCγ2–cytokine link in microglia, mast cells, or monocytes specifically. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • PLCG2 plays a critical role in transducing signals emanating from a number of immune receptors, acting as an intracellular hub for immune signaling.

    “PLCG2 plays a critical role in transducing signals emanating from a number of immune receptors, acting as an intracellular hub for immune signaling.”
  • PLCG2 mediates transduction of many other cell surface receptors in addition to TREM2.

    “Likewise, PLCG2 mediates transduction of many other cell surface receptors in addition to TREM2. 13 , 15 , 16 , 17 , 18 , 19 , 20 , 21”

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Authors
Aki, D., Minoda, Y., Yoshida, H., Watanabe, S., Yoshida, R., Takaesu, G., Chinen, T., Inaba, T., Hikida, M., Kurosaki, T., Saeki, K., & Yoshimura, A.
Affiliations
  • Hiroshima University (JP)
  • Kyushu University (JP)
  • RIKEN (JP)
Corresponding author
Yoshimura, Akihiko
Venue
Genes to Cells
Publisher
Wiley
Published
2008-01-30
Volume
13
Issue
2
Pages
199-208
ISSN
  • 1356-9597 (ISSN-L)
  • 1365-2443
OpenAlex
W2143395804
Cited by
68
References
38
Citations by year
2026: 1 · 2025: 1 · 2023: 2 · 2021: 6 · 2019: 2 · 2018: 2 · 2016: 6 · 2015: 12 · 2014: 5 · 2013: 1 · 2012: 5
FWCI
3.47
Type
journal article
Language
en
Open access
Locations
  • Genes to Cells (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Takeda Science Foundation
  • National Institute of Biomedical Innovation
  • Kanae Foundation for the Promotion of Medical Science
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
peptidoglycan, lipopolysaccharide, PLCγ2, TLR2, TLR4, tyrosine phosphorylation, calcium mobilization, macrophages, dendritic cells, TNF-α, interleukin-6, IκBα phosphorylation, p38 MAPK, Toll-like receptor signaling
MeSH terms
Animals, Base Sequence, Cell Line, Dendritic Cells, Enzyme Activation, Humans, Ligands, Lipopolysaccharides, Macrophages, Mice, Mutant Strains, Mice, Transgenic, Peptidoglycan, Transfection, Tumor Necrosis Factor-alpha, Signal Transduction, Interleukin-6, Cytokines, Calcium Signaling, RNA, Small Interfering, Toll-Like Receptor 2, Toll-Like Receptor 4, Mice, Phospholipase C gamma

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