Cited by 168T-cell and B-cell ImmunologySystemic Lupus Erythematosus ResearchImmune Response and Inflammation

Sustained Activation of Lyn Tyrosine Kinase In Vivo Leads to Autoimmunity

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Hibbs, Margaret L., Harder, Kenneth W., Armes, Jane, Kountouri, Nicole, Quilici, Cathy, Casagranda, Franca, Dunn, Ashley R., Tarlinton, David M.·2002·The Journal of Experimental Medicine

Abstract

Genetic ablation of the Lyn tyrosine kinase has revealed unique inhibitory roles in B lymphocyte signaling. We now report the consequences of sustained activation of Lyn in vivo using a targeted gain-of-function mutation (Lynup/up mice). Lynup/up mice have reduced numbers of conventional B lymphocytes, down-regulated surface immunoglobulin M and costimulatory molecules, and elevated numbers of B1a B cells. Lynup/up B cells are characterized by the constitutive phosphorylation of negative regulators of B cell antigen receptor (BCR) signaling including CD22, SHP-1, and SHIP-1, and display attributes of lymphocytes rendered tolerant by constitutive engagement of the antigen receptor. However, exaggerated positive signaling is also apparent as evidenced by the constitutive phosphorylation of Syk and phospholipase Cγ2 in resting Lynup/up B cells. Similarly, Lynup/up B cells show a heightened calcium flux in response to BCR stimulation. Surprisingly, Lynup/up mice develop circulating autoreactive antibodies and lethal autoimmune glomerulonephritis, suggesting that enhanced positive signaling eventually overrides constitutive negative signaling. These studies highlight the difficulty in maintaining tolerance in the face of chronic stimulation and emphasize the pivotal role of Lyn in B cell signaling.

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  • Lyn tyrosine kinase autoactivation (gain-of-function) mice, after BCR stimulation, showed constitutive phosphorylation of Syk/PLCγ2 with resultant increased calcium flux in their resting B cells.

    “Lyn tyrosine kinase autoactivation (gain-of-function) mice, after BCR stimulation, showed constitutive phosphorylation of Syk/PLCγ2, with a resultant increased calcium flux, observed in their resting B cells (118).”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [118]

    In Results, “Altered Lyn Protein Levels and Signaling in Lynup/up B Cells,” Syk and PLCγ2 are phosphorylated in unstimulated mutant B cells, with phosphorylation increasing after BCR stimulation. In “Calcium Signaling in Lynup/up B Cells,” the higher calcium-flux peak occurs after BCR cross-linking, not consistently in resting cells; basal calcium was variably elevated. The paper also says the higher peak *possibly* reflects PLCγ2 hyperactivation, rather than establishing that causal link. (LLM, conf=0.86)

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  • PLCγ2 hyperactivation in Lyn tyrosine kinase autoactivation mice led to increased levels of autoantibodies and ultimately a lethal autoimmune glomerulonephritis.

    “These circumstances of PLCγ2 hyperactivation led to an increased level of autoantibodies in these mice and ultimately a lethal autoimmune glomerulonephritis (118).”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [118]

    The Abstract reports constitutive PLCγ2 phosphorylation in Lynup/up B cells and circulating autoreactive antibodies and lethal autoimmune glomerulonephritis in the mice. The Results section on circulating autoreactive antibodies finds antinuclear antibodies in most Lynup/up mice but weak or no staining in wild-type mice. The paper suggests that enhanced positive signaling contributes to the disease; it does not establish that PLCγ2 hyperactivation specifically caused it. (LLM, conf=0.85)

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Authors
Hibbs, M. L., Harder, K. W., Armes, J., Kountouri, N., Quilici, C., Casagranda, F., Dunn, A. R., & Tarlinton, D. M.
Affiliations
  • Ludwig Cancer Research (AU)
  • Royal Women's Hospital (AU)
  • The Royal Melbourne Hospital (AU)
Corresponding author
Hibbs, Margaret L.
Venue
The Journal of Experimental Medicine
Published
2002-12-16
Volume
196
Issue
12
Pages
1593-1604
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2168601978
Cited by
168
References
63
Citations by year
2026: 2 · 2025: 8 · 2024: 4 · 2023: 10 · 2022: 5 · 2021: 4 · 2020: 5 · 2019: 2 · 2018: 5 · 2017: 3 · 2016: 5 · 2015: 5 · 2014: 12 · 2013: 13 · 2012: 13
FWCI
2.41
Type
journal article
Language
en
Open access
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc-sa)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Health Sciences › Medicine › Rheumatology › Systemic Lupus Erythematosus Research
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
Lyn kinase, B cell signaling, autoimmunity, B cell tolerance, B cell receptor signaling, CD22, SHP-1, SHIP1, Syk, PLCγ2, calcium flux, autoantibodies, glomerulonephritis
MeSH terms
Animals, Antigen-Antibody Complex, Autoantibodies, Autoimmune Diseases, B-Lymphocytes, Calcium, Cell Separation, Cells, Cultured, Enzyme Activation, Female, Flow Cytometry, Glomerulonephritis, Humans, Immunoglobulins, Kidney, Lymph Nodes, Male, Mice, Inbred C57BL, Mice, Transgenic, Phenotype, Spleen, Signal Transduction, Autoimmunity, Antigens, CD, Up-Regulation, Point Mutation, src-Family Kinases, Mice

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