Cited by 164Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesNF-κB Signaling Pathways

B cell antigen receptor cross-linking induces phosphorylation of the p21 ras oncoprotein activators SHC and mSOS1 as well as assembly of complexes containing SHC, GRB-2, mSOS1, and a 145-kDa tyrosine-phosphorylated protein.

Saxton, T M, van Oostveen, I, Bowtell, D, Aebersold, R, Gold, M R·1994·The Journal of Immunology

Abstract

Ligation of the B cell AgR activates p21ras (Ras). We have investigated the effects of AgR ligation on three proteins that have been implicated as regulators of Ras: SHC, GRB-2, and mSOS1. We show that AgR cross-linking in B cells stimulated tyrosine and serine phosphorylation of SHC. This correlated with the formation of complexes containing SHC, GRB-2, mSOS1, and an unidentified 145-kDa tyrosine-phosphorylated protein. These complexes were present in the cytosol, as well as in the membrane fraction of the cells, where Ras is located. By using a GRB-2 fusion protein to probe blots, we showed that SHC was the major protein that GRB-2 bound to in anti-Ig-stimulated B cells. This argues that SHC couples GRB-2/mSOS1 to the 145-kDa protein and that SHC is likely to be essential for mSOS1 function in B cells. Finally, we found that AgR cross-linking stimulated phosphorylation of mSOS1 and that this could be blocked by an inhibitor of protein kinase C. Thus, signaling by the B cell AgR stimulates phosphorylation of SHC and mSOS1 and induces the formation of membrane-associated complexes containing SHC, GRB-2, mSOS1, and a 145-kDa protein. These events may be important for activation of Ras by the AgR.

Integrity signals

Registry

Crossref · 10.4049/jimmunol.153.2.623

Cites

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

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?

Cites

Still being checked.

Cited by

Sorted by citations

Authors
Saxton, T. M., van Oostveen, I., Bowtell, D., Aebersold, R., & Gold, M. R.
Affiliations
  • University of British Columbia (CA)
  • the Biomedical Research Centre, University of British Columbia , Vancouver, British Columbia V6T 1Z3 ,
Venue
The Journal of Immunology
Published
1994-07
Volume
153
Issue
2
Pages
623-636
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1488229599
Cited by
164
References
0
Citations by year
2023: 3 · 2022: 1 · 2020: 3 · 2018: 1 · 2017: 2 · 2016: 3 · 2015: 1 · 2014: 1 · 2012: 1
FWCI
7.21
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
B cell receptor, receptor cross-linking, Shc, Grb2, Ras activation, tyrosine phosphorylation, protein kinase C, B cell signaling
MeSH terms
Animals, Membrane Proteins, Mice, Inbred DBA, Phosphoproteins, Phosphorylation, Proteins, Receptors, Antigen, B-Cell, Serine, Tumor Cells, Cultured, Tyrosine, Proto-Oncogene Proteins p21(ras), Son of Sevenless Proteins, Adaptor Proteins, Signal Transducing, Mice, GRB2 Adaptor Protein

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