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Small Molecule SOS1 Agonists Modulate MAPK and PI3K Signaling via Independent Cellular Responses
Denis T Akan1, Jennifer E Howes1, Jiqing Sai1
1Department of Biochemistry , Vanderbilt University School of Medicine , 2215 Garland Avenue, 607 Light Hall , Nashville , Tennessee 37232-0146 , United States.
Targeting SOS1 with novel agonists modulates RAS signaling, impacting both MAPK and PI3K pathways. Researchers identified a potent SOS1 agonist with rapid, on-target effects, advancing therapeutic strategies for RAS-driven cancers.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Activating RAS mutations drive oncogenesis via MAPK and PI3K pathways.
- Targeting RAS signaling pathways is a key therapeutic strategy.
- SOS1 (Son of Sevenless homolog 1) is a guanine nucleotide exchange factor that modulates RAS activity.
Purpose of the Study:
- To investigate the mechanistic link between SOS1 agonist activity and downstream signaling modulation.
- To explore the therapeutic potential of SOS1 agonists in RAS-driven oncogenesis.
- To identify potent SOS1 agonists with specific on-target effects.
Main Methods:
- Utilized chemically distinct SOS1 agonist compounds.
- Employed CRISPR/Cas9 gene-editing to generate SOS1 knockout cells.
- Analyzed ERK and AKT phosphorylation levels to assess pathway modulation.
Main Results:
- SOS1 agonists demonstrated biphasic modulation of ERK phosphorylation and simultaneous inhibition of AKT phosphorylation.
- Distinct SOS1 agonists were used to confirm mechanistic links in signaling effects.
- A potent SOS1 agonist was identified, eliciting rapid on-target effects at low concentrations.
Conclusions:
- SOS1 agonists can simultaneously modulate MAPK and PI3K signaling pathways.
- CRISPR/Cas9-generated SOS1 knockout cells aided in elucidating on-target effects.
- Findings support the further definition of SOS1 agonists for therapeutic utility in RAS-driven cancers.
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