Subcellular control of Rac-GTPase signalling by magnetogenetic manipulation inside living cells

Area of Science:

• Cell Biology
• Biotechnology
• Molecular Signaling

Background:

• Cellular functions depend on coordinated intracellular signaling pathways.
• Existing tools lack the spatial resolution to probe and perturb these pathways at the subcellular level.
• Controlling spatiotemporal signaling is crucial for understanding cell behavior.

Purpose of the Study:

• To introduce a generic magnetogenetic approach for precise control of intracellular signaling pathways.
• To demonstrate the capability of magnetic nanoparticles to act as localized activators of signal transduction.
• To investigate the effects of targeted signaling activation on cell morphology and cytoskeleton dynamics.

Main Methods:

• Developed functionalized magnetic nanoparticles for intracellular use.
• Utilized magnetic forces to assemble and displace nanoparticles, creating signaling 'hot spots'.
• Applied the method to study Rho-GTPase signaling pathways regulating the actin cytoskeleton.

Main Results:

• Demonstrated successful self-assembly of signaling complexes on magnetic nanoparticles within living cells.
• Showcased nanoparticle-induced activation of signal transduction pathways via magnetic manipulation.
• Observed localized actin cytoskeleton remodeling and significant cell morphological changes in response to targeted signaling.

Conclusions:

• The presented magnetogenetic strategy offers a powerful tool for probing and perturbing subcellular signaling with high spatial and temporal control.
• This approach provides new possibilities for understanding and manipulating cell functions regulated by complex signaling networks.
• The method is applicable to various signaling pathways, including Rho-GTPases, impacting cytoskeleton dynamics and cell shape.