Rho-Kinase Signaling in Cellular Mechanisms

Rho-kinase signalling orchestrates a broad spectrum of cellular activities through the direct activation of serine/threonine kinases downstream of the Rho family of small GTPases. Two major isoforms, ROCK1 and ROCK2, regulate actomyosin contractility by phosphorylating myosin light chain and by inhibiting myosin phosphatase, thereby modulating cytoskeletal dynamics essential for cell migration, adhesion, proliferation and cytokinesis. Beyond cytoskeletal control, Rho-kinase influences gene expression, cell survival and extracellular matrix remodelling. Its dysregulation underlies key pathological processes including tumour progression, vascular dysfunction, neurodegeneration and fibrotic disorders. Pharmacological inhibitors such as fasudil and Y-27632 have illuminated the therapeutic potential of targeting ROCK in diverse settings, from cancer metastasis to cerebral ischaemia. Emerging work also highlights complex feedback loops with growth factor and inflammatory pathways, emphasising Rho-kinase as a nodal point in cellular mechanotransduction and intercellular communication.

Research from Nature Portfolio

Recent studies have demonstrated that combining Rho-kinase blockade with immunogenic cell death markedly enhances antitumour immunity. In experimental cancer models, ROCK inhibition augmented the phagocytic capacity of antigen-presenting cells, leading to improved dendritic cell maturation and CD8+ T-cell priming. When paired with immunogenic chemotherapy, this strategy drove synergistic T-cell infiltration into tumours and prolonged survival in genetically engineered mouse models. These findings position Rho-kinase inhibition as a means to boost intrinsic immune responses and to overcome resistance to existing immunotherapies.

Rho-Kinase Signaling in Cellular Mechanisms publication trend

The graph below shows the total number of articles in rho-kinase signaling in cellular mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Rho GTPase: A member of the Ras superfamily of small guanine nucleotide-binding proteins that cycles between active (GTP-bound) and inactive (GDP-bound) forms to regulate the actin cytoskeleton.

Rho-associated coiled-coil kinase (ROCK): A serine/threonine kinase activated by GTP-bound Rho GTPases, comprising two isoforms (ROCK1 and ROCK2) that phosphorylate target proteins involved in contractility and adhesion.

Myosin light chain phosphorylation: The covalent attachment of phosphate groups to the regulatory light chain of myosin II, enhancing actomyosin cross-bridge cycling and cellular contractile force.

Actomyosin contractility: The process by which actin filaments and myosin motors interact to generate tensile force within cells, driving shape change, motility and tension sensing.

Immunogenic cell death: A form of regulated cell death characterised by the release of danger signals that promote antigen presentation and stimulate adaptive immune responses.

References

1. Preclinical to clinical utility of ROCK inhibitors in cancer. Trends in Cancer (2023).
2. Paxillin participates in the sphingosylphosphorylcholine-induced abnormal contraction of vascular smooth muscle by regulating Rho-kinase activation. Cell Communication and Signaling (2024).
3. Rho signaling research: history, current status and future directions. FEBS Letters (2018).
4. Phosphorylation and Activation of Myosin by Rho-associated Kinase (Rho-kinase)*. Journal of Biological Chemistry (1996).
5. Combined Rho-kinase inhibition and immunogenic cell death triggers and propagates immunity against cancer. Nature Communications (2018).
6. Rho-Associated Coiled-Coil Kinase (ROCK) in Molecular Regulation of Angiogenesis. Theranostics (2018).