Cited by 34Protein Tyrosine PhosphatasesT-cell and B-cell ImmunologyProtein Kinase Regulation and GTPase Signaling

Src Homology Region 2 Domain-Containing Phosphatase 1 Positively Regulates B Cell Receptor-Induced Apoptosis by Modulating Association of B Cell Linker Protein with Nck and Activation of c-Jun NH2-Terminal Kinase

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Mizuno, Kazuya, Tagawa, Yuko, Mitomo, Katsuyuki, Watanabe, Noriyuki, Katagiri, Tatsuo, Ogimoto, Mami, Yakura, Hidetaka·2002·The Journal of Immunology

Abstract

Src homology region 2 domain-containing phosphatase 1 (SHP-1) is a key mediator in lymphocyte differentiation, proliferation, and activation. We previously showed that B cell linker protein (BLNK) is a physiological substrate of SHP-1 and that B cell receptor (BCR)-induced activation of c-Jun NH2-terminal kinase (JNK) is significantly enhanced in cells expressing a form of SHP-1 lacking phosphatase activity (SHP-1-C/S). In this study, we confirmed that SHP-1 also exerts negative regulatory effects on JNK activation in splenic B cells. To further clarify the role of SHP-1 in B cells, we examined how dephosphorylation of BLNK by SHP-1 affects downstream signaling events. When a BLNK mutant (BLNKΔN) lacking the NH2-terminal region, which contains four tyrosine residues, was introduced in SHP-1-C/S-expressing WEHI-231 cells, the enhanced JNK activation was inhibited. Among candidate proteins likely to regulate JNK activation through BLNK, Nck adaptor protein was found to associate with tyrosine-phosphorylated BLNK and this association was more pronounced in SHP-1-C/S-expressing cells. Furthermore, expression of dominant-negative forms of Nck inhibited BCR-induced JNK activation. Finally, BCR-induced apoptosis was suppressed in SHP-1-C/S-expressing cells and coexpression of Nck SH2 mutants or a dominant-negative form of SEK1 reversed this phenotype. Collectively, these results suggest that SHP-1 acts on BLNK, modulating its association with Nck, which in turn negatively regulates JNK activation but exerts a positive effect on apoptosis.

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Crossref · 10.4049/jimmunol.169.2.778

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  • Alternative signaling pathways through CD38, CD40, IL-4R, LPS/TLR4/MyD88, and CD86 also utilize PLCγ2, while TGF-βR stimulation inhibits PLCγ2 function in B cells.

    “Aside from BCR engagement, there are alternative signaling pathways initiated through extracellular immunological receptors that also utilize PLCγ2 to function, which include CD38 (16), CD40 (52), IL-4R (53, 54, 55) and the LPS/TLR4/MyD88 pathway, the latter of which induces ERK and NK-κB phosphorylation in MEKs in a PI3K-independent fashion (56). CD86 engagement was also observed to signal via PL”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [53]

    The introductory passage (section C; page unavailable) mentions phospholipase Cγ as a protein recruited by BLNK after BCR ligation, not through the alternative receptors in the claim. Searches for CD38, CD40, IL-4R, LPS/TLR4/MyD88, CD86, and TGF-βR found no passage establishing their claimed effects on PLCγ2. (LLM, conf=0.76)

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Authors
Mizuno, K., Tagawa, Y., Mitomo, K., Watanabe, N., Katagiri, T., Ogimoto, M., & Yakura, H.
Affiliations
Tokyo Metropolitan Institute of Medical Science (JP)
Venue
The Journal of Immunology
Published
2002-07
Volume
169
Issue
2
Pages
778-786
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2099206489
Cited by
34
References
54
Citations by year
2022: 1 · 2021: 2 · 2019: 2 · 2018: 1 · 2016: 1 · 2014: 1 · 2013: 1 · 2012: 2
FWCI
1.39
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Ministry of Education, Culture, Sports, Science and Technology
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • 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
SHP-1, Nck, c-Jun NH2-terminal kinase, JNK activation, B cell receptor signaling, apoptosis, tyrosine phosphorylation, SEK1, B cell signaling
MeSH terms
Adjuvants, Immunologic, Animals, B-Lymphocytes, Carrier Proteins, Enzyme Activation, Mice, Inbred C3H, Mice, Mutant Strains, Peptide Fragments, Phosphoproteins, Receptors, Antigen, B-Cell, Spleen, Tumor Cells, Cultured, Oncogene Proteins, Down-Regulation, Up-Regulation, Protein Tyrosine Phosphatases, Apoptosis, src Homology Domains, Mitogen-Activated Protein Kinases, Intracellular Signaling Peptides and Proteins, JNK Mitogen-Activated Protein Kinases, Adaptor Proteins, Signal Transducing, Mice, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Phosphatase 1

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