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Related Experiment Video

Updated: Feb 7, 2026

GPI Anchoring of Proteins in the ER Membrane

GPI Anchoring of Proteins in the ER Membrane

Tumour maintenance is mediated by eNOS.

Kian-Huat Lim¹, Brooke B Ancrile, David F Kashatus

¹Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.

|March 18, 2008

Summary

This summary is machine-generated.

Blocking endothelial nitric oxide synthase (eNOS) phosphorylation inhibits tumour growth by disrupting the PI3K-AKT-eNOS pathway. This pathway is crucial for maintaining oncogenic Ras activation, essential for tumour initiation and progression.

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Last Updated: Feb 7, 2026

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Area of Science:

Oncology
Molecular Biology
Biochemistry

Background:

Tumour cells rely on oncogenes like Ras for growth.
Mutated Ras proteins are constitutively active in many cancers.
Oncogenic Ras activates pathways, including PI3K-AKT, to sustain tumour growth.

Purpose of the Study:

To investigate the role of endothelial nitric oxide synthase (eNOS) in oncogenic Ras-driven tumour growth.
To determine if blocking eNOS phosphorylation affects tumour initiation and maintenance.

Main Methods:

Focus on blocking the phosphorylation of the AKT substrate, eNOS.
Analysis of eNOS's role in nitrosylation and activation of wild-type Ras proteins.
Inhibition studies targeting the PI3K-AKT-eNOS pathway.

Main Results:

Blocking eNOS phosphorylation effectively inhibits both tumour initiation and maintenance.
eNOS was found to enhance the nitrosylation and activation of endogenous wild-type Ras proteins.
This activation of wild-type Ras by eNOS is essential throughout tumorigenesis.

Conclusions:

The PI3K-AKT-eNOS-(wild-type) Ras pathway is critical for tumour growth.
Oncogenic Ras activates this pathway to initiate and maintain tumour development.
Targeting eNOS phosphorylation presents a potential therapeutic strategy for cancers driven by Ras.