GPCR activation of Ras and PI3Kγ in neutrophils depends on PLCβ2/β3 and the RasGEF RasGRP4
Open accessAbstract
The molecular mechanisms by which receptors regulate the Ras Binding Domains of the PIP3-generating, class I PI3Ks remain poorly understood, despite their importance in a range of biological settings, including tumorigenesis, activation of neutrophils by pro-inflammatory mediators, chemotaxis of Dictyostelium and cell growth in Drosophila. We provide evidence that G protein-coupled receptors (GPCRs) can stimulate PLCb2/b3 and diacylglycerol- dependent activation of the RasGEF, RasGRP4 in neutrophils. The genetic loss of RasGRP4 phenocopies knock-in of a Ras-insensitive version of PI3Kc in its effects on PI3Kc-dependent PIP3 accumulation, PKB activation, chemokinesis and reactive oxygen species (ROS) formation. These results establish a new mechanism by which GPCRs can stimulate Ras, and the broadly important principle that PLCs can control activation of class I PI3Ks.
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PKC, Munc13 and RasGRP4 are regulated by transient changes in DAG.
“Members of the PKC and Munc13 (mammalian uncoordinated-13) family as well as RasGRP4 (Ras guanyl-releasing protein 4) are prime examples of proteins that are regulated by transient changes in DAG [51–53].”
From Phosphatidylinositol(4,5)bisphosphate: diverse functions at the plasma membrane (2020) · cites this paper as [51]
In “The molecular mechanism regulating activation of RasGRP4” (page not available), the paper identifies RasGRP4 as DAG-binding and describes PKCs as DAG-regulated effectors. Our copy does not address Munc13 or establish that transient DAG changes regulate all three protein groups. (LLM, conf=0.86)
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- Authors
- Suire, S., Lécureuil, C., Anderson, K. E., Damoulakis, G., Niewczas, I., Davidson, K., Guillou, H., Pan, D., Clark, J., Hawkins, P. T., & Stephens, L.
- Affiliations
- Babraham Institute (GB)
- Babraham Bioscience Technologies (United Kingdom) (GB)
- Corresponding author
- Stephens, Len
- ORCID
- Venue
- The EMBO Journal
- Published
- 2012-06-22
- Volume
- 31
- Issue
- 14
- Pages
- 3118-3129
- ISSN
- 0261-4189 (ISSN-L)
- 1460-2075
- PMC
- PMC3400018
- OpenAlex
- W2145377609
- Cited by
- 77
- References
- 60
- Citations by year
- 2026: 2 · 2025: 7 · 2024: 5 · 2023: 9 · 2022: 4 · 2021: 5 · 2020: 11 · 2019: 6 · 2018: 2 · 2017: 2 · 2016: 2 · 2015: 3 · 2014: 6 · 2013: 11 · 2012: 2
- FWCI
- 2.83
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- The EMBO Journal (publishedVersion, other-oa)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- HAL (submittedVersion)
- Funders
- Yale University
- Wellcome Trust
- British Lung Foundation
- Biotechnology and Biological Sciences Research Council (C20177, BBS/E/B/000C0411, BB/D013593/1, BBS/E/B/0000C238)
- 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 › PI3K/AKT/mTOR signaling in cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Keywords
- G protein-coupled receptors, Ras, PI3Kγ, PLCβ2, PLCβ3, neutrophils, diacylglycerol, phosphatidylinositol 3,4,5-trisphosphate, chemokinesis, reactive oxygen species, receptor signaling
- MeSH terms
- Animals, Cell Line, Enzyme Activation, Humans, Neutrophils, Mice, Knockout, ras Proteins, ras Guanine Nucleotide Exchange Factors, Receptors, G-Protein-Coupled, Proto-Oncogene Proteins c-akt, Mice, Phospholipase C beta, Class Ib Phosphatidylinositol 3-Kinase
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