Regulatory Mechanisms of Actin Dynamics in Cellular Functions

The dynamic assembly and disassembly of actin filaments underpins a vast array of cellular processes, from the generation of force for migration and division to the transmission of mechanical signals that influence gene expression. Central to this regulation are Rho family GTPases, which orchestrate filament nucleation via proteins such as the Arp2/3 complex and formins, and control turnover through factors including cofilin and profilin. These regulators respond to extracellular cues—chemical gradients, adhesion receptors and mechanical stress—to remodel the cytoskeleton in real time. In addition to shaping cell morphology and motility, actin dynamics directly affect transcriptional programmes through mechanotransduction pathways. Mechanical perturbation of the actin network alters the nuclear localisation of myocardin-related transcription factors (MRTFs), modulating serum response factor (SRF)-dependent gene expression. Post-translational modifications of actin regulators, such as phosphorylation and SUMOylation, further fine-tune filament dynamics and coordinate cross-talk with growth-factor and inflammatory signalling. Dysregulation of these processes is implicated in cancer invasion, fibrosis, immune dysfunction and developmental disorders. Understanding the interplay between actin-binding proteins, signalling pathways and nuclear responses has opened new avenues for therapeutic intervention in diseases driven by aberrant cell mechanics and motility.

Research from Nature Portfolio

Recent studies have revealed a sophisticated interplay between mechanosensitive transcriptional co-activators that link cytoskeletal organisation to gene regulation. Seminal work has shown that myocardin-related transcription factors and the transcriptional co-activator TAZ engage in multilevel cross-talk: they mutually influence each other’s expression, cytosolic mobility and nuclear accumulation in response to mechanical and chemical stimuli. This context-dependent interaction modulates downstream promoters, inhibiting or synergising on distinct cis-elements and integrating TGFβ signals with stretch-induced mechanotransduction. Such findings highlight how actin dynamics not only generate force but also serve as a platform for bidirectional communication between the cytoskeleton and nucleus, fine-tuning programmes of wound healing, myofibroblast transition and tissue remodelling.

Regulatory Mechanisms of Actin Dynamics in Cellular Functions publication trend

The graph below shows the total number of articles in regulatory mechanisms of actin dynamics in cellular functions across all publications each year (not limited to Nature Index journals).

Technical terms

Rho GTPases: Molecular switches that control actin nucleation, branching and turnover by cycling between active and inactive states.

Arp2/3 complex: A seven-subunit protein assembly that initiates new branched actin filaments from existing ones.

Formins: Proteins that promote the elongation of straight, unbranched actin filaments at their barbed ends.

Cofilin: An actin-severing factor that accelerates filament disassembly and recycling of actin monomers.

Mechanotransduction: The process by which cells convert mechanical forces into biochemical signals affecting function and gene expression.

Myocardin-related transcription factor (MRTF): A co-activator that links changes in actin polymerisation to SRF-driven transcriptional programmes.

SUMOylation: A reversible post-translational modification involving attachment of a SUMO peptide, regulating the localisation and activity of target proteins.

References

1. Inhibitors of Rho/MRTF/SRF Transcription Pathway Regulate Mitochondrial Function. Cells (2024).
2. Role of Rho/MRTF in Aggressive Vemurafenib-Resistant Murine Melanomas and Immune Checkpoint Upregulation. International Journal of Molecular Sciences (2023).
3. Context-dependent switch in chemo/mechanotransduction via multilevel crosstalk among cytoskeleton-regulated MRTF and TAZ and TGFβ-regulated Smad3. Nature Communications (2016).