TGFβ-induced changes in membrane curvature influence Ras oncoprotein membrane localization

Area of Science:

• Cell Biology
• Cancer Research
• Molecular Biology

Background:

• Cancer progression involves tumor cell morphological changes, increasing motility and invasiveness, leading to metastasis.
• Epithelial to mesenchymal transition (EMT), triggered by transforming growth factor beta (TGFβ), is crucial for invasive potential.
• Ras GTPases, essential for cell signaling, interact with TGFβ to drive cancer cell invasiveness.

Purpose of the Study:

• To investigate the effect of TGFβ on the subcellular localization of H-ras and K-ras.
• To elucidate the role of plasma membrane curvature in TGFβ-induced cancer cell invasion.

Main Methods:

• Treatment of cancer cells with TGFβ.
• Analysis of subcellular localization of H-ras and K-ras using microscopy.
• Measurement of plasma membrane curvature.

Main Results:

• TGFβ treatment increases positive plasma membrane curvature.
• H-ras is recruited to the plasma membrane in response to increased curvature.
• This recruitment leads to elevated H-ras activation and promotes further EMT.

Conclusions:

• A novel positive feedback loop exists where TGFβ-induced EMT increases plasma membrane curvature, attracting Ras proteins.
• Increased Ras activity at the plasma membrane potentiates EMT and enhances cancer cell invasiveness.
• Targeting this feedback loop could offer new therapeutic strategies for invasive cancers.