Cited by 113Protein Kinase Regulation and GTPase SignalingCellular transport and secretionProtein Tyrosine Phosphatases

Requirement for Ras Guanine Nucleotide Releasing Protein 3 in Coupling Phospholipase C-γ2 to Ras in B Cell Receptor Signaling

Open access
Oh-hora, Masatsugu, Johmura, Sachiko, Hashimoto, Ari, Hikida, Masaki, Kurosaki, Tomohiro·2003·The Journal of Experimental Medicine

Abstract

Two important Ras guanine nucleotide exchange factors, Son of sevenless (Sos) and Ras guanine nucleotide releasing protein (RasGRP), have been implicated in controlling Ras activation when cell surface receptors are stimulated. To address the specificity or redundancy of these exchange factors, we have generated Sos1/Sos2 double- or RasGRP3-deficient B cell lines and determined their ability to mediate Ras activation upon B cell receptor (BCR) stimulation. The BCR requires RasGRP3; in contrast, epidermal growth factor receptor is dependent on Sos1 and Sos2. Furthermore, we show that BCR-induced recruitment of RasGRP3 to the membrane and the subsequent Ras activation are significantly attenuated in phospholipase C-γ2–deficient B cells. This defective Ras activation is suppressed by the expression of RasGRP3 as a membrane-attached form, suggesting that phospholipase C-γ2 regulates RasGRP3 localization and thereby Ras activation.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1084/jem.20031547

Cites

68 of 68 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Several biochemical pathways and processes negatively regulate PLCγ2 activity and calcium flux after BCR engagement, including RasGRP3, Bam32, Dok-3 with Grb2, Themis2, BLNK, and SFRP2.

    “Several biochemical pathways and processes were shown to negatively regulate PLCγ2 activity and the resulting calcium flux after BCR engagement. These include RasGRP3 (39, 40), Bam32 (41), hematopoietic adaptor protein Dok-3 (downstream of kinase-3) with Grb2 (42), Themis2, an adaptor protein with no known enzymatic activity, via constitutive binding to Lyn, Grb2, and PLCγ2 to mediate its function”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [39]

    The citation to this paper is attached to RasGRP3, not the other listed proteins. In the Results (Figure 5 and accompanying text), BCR-induced IP3 generation and calcium mobilization were unaffected by RasGRP3 deficiency; the Discussion instead places RasGRP3 downstream of PLC-γ2 in Ras activation. (LLM, conf=0.90)

    Checked by a reasoning model — may be wrong.

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 69 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Oh-hora, M., Johmura, S., Hashimoto, A., Hikida, M., & Kurosaki, T.
Affiliations
  • 1Department of Molecular Genetics, Institute for Liver Research, Kansai Medical University, Moriguchi 570-8506, Japan
  • Kansai Medical University (JP)
Venue
The Journal of Experimental Medicine
Published
2003-12-15
Volume
198
Issue
12
Pages
1841-1851
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2131566341
Cited by
113
References
69
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 2 · 2020: 4 · 2019: 4 · 2018: 1 · 2017: 2 · 2016: 4 · 2015: 4 · 2014: 3 · 2013: 6 · 2012: 4
FWCI
3.57
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
Uehara Memorial Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
RasGRP3, SOS1, SOS2, Ras guanine nucleotide exchange factor, Ras activation, B cell receptor signaling, PLCγ2, epidermal growth factor receptor, membrane recruitment, B-cell lines
MeSH terms
Amino Acid Sequence, Animals, Mice, Inbred C57BL, Molecular Sequence Data, Type C Phospholipases, Receptors, Antigen, B-Cell, Signal Transduction, ras Proteins, Guanine Nucleotide Exchange Factors, ras Guanine Nucleotide Exchange Factors, Son of Sevenless Proteins, SOS1 Protein, Mice, Phospholipase C gamma

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review