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ROCK2 inhibition has a dual role in reducing ECM remodelling and cell growth, while impairing migration and invasion

Daniel A. Reed, Anna E. Howell, Nadia Kuepper, Alice M. H. Tran, Astrid Magenau, Deborah S. Barkauskas, Max Nobis, Cecilia R. Chambers, Victoria Lee, Lily M. Channon, Jessie Zhu, Shona Ritchie, Janett Stoehr, Kaitlin Wylie, Julia Chen, Denise Attwater, Kate Harvey, Sunny Z. Wu, Kate Saw, Ruth J. Lyons, Anaiis Zaratzian, Michael Tayao, Andrew Da Silva, David Gallego-Ortega, Anthony J. Gill, Thomas R. Cox, Brooke A. Pereira, Kendelle J. Murphy, Jennifer P. Morton, Elgene Lim, Alexander Swarbrick, Sandra O’Toole, Michael S. Samuel, C. Elizabeth Caldon, Alexandra Zanin-Zhorov, Paul Timpson, David Herrmann

Posted on: 27 November 2025

Preprint posted on 2 September 2025

GV101 will, GV101 will ROCK you!

Selected by Sharvari Pitke

What I like most about this preprint?

Cell interactions with its environment and the interpretation of these diverse biomechanical cues by cells fascinate me greatly. I find the preprint’s focus on studying the effects of ROCK2 modulation on cell behaviour, specifically, the contribution of different cell types to the collective phenotype, interesting. The study describes the impact of a ROCK2-specific inhibitor on both stromal and epithelial cells in the context of triple-negative breast cancer. It also uncovers the roles these cell types play during cancer cell invasion.

Background and hypothesis:

The interaction between the cell and its extracellular environment provides chemical and mechanical cues that regulate various cellular processes, as well as the cell’s response to environmental signals. The Rho-associated protein kinases 1/2 (ROCK1/2) are essential regulators of the actin cytoskeleton and cytoskeleton-dependent cellular activities. ROCK activation mainly occurs through the binding of the small GTPase RhoA, and this signalling pathway has been linked to many diseases. ROCK1 and ROCK2 are expressed in multiple cell types in both embryonic and adult tissues. Although these kinases share roles, they also exhibit cell-specific functions.
Existing pan-ROCK inhibitors have shown promising results in proof-of-concept studies, but often fail in translational studies. This study explores the role of ROCK2 in a breast cancer model using a specific pharmacological inhibitor, GV101. It also investigates the effects of ROCK2 inhibition on both stromal fibroblasts and epithelial cell populations.

Key Findings:

ROCK2 inhibition reduces ECM remodelling by fibroblasts
To study the effect of ROCK2 inhibition on ECM remodelling, fibroblasts were embedded in a fibrillar collagen matrix and treated with GV101. It was seen that treatment with GV101 reduces ECM contraction and reduces matrix stiffness in both murine and human models. Treatment with GV101 resulted in reduced formation of highly bundled collagen fibres, indicating that ROCK2 may be required for the formation of mature collagen fibres in murine fibroblasts, while this treatment affected all stages of collagen fibre maturation, bundling, and crosslinking in human CAFs. Furthermore, GV101 also adversely affects the de novo fibrillar production in both murine and human models.

ROCK2 inhibition reduces epithelial cell growth, sensitises cells to shear stress and affects cell migratory dynamics.
Both murine (PyMT) and human (MDA-MB-231) cells exhibit decreased cell viability upon GV101 treatment in 2D, accompanied by reduced colony-forming capacities in 3D. Similarly, an increase in apoptosis following shear stress is observed in both cell types upon ROCK2 inhibition.
Cells were seeded on cell-derived matrices to check the effect of ROCK2 inhibition on single-cell and collective migratory dynamics. Since PyMT cells were not found to be highly migratory, MDA-MB-231 cells exhibited a significant decrease in single-cell migratory speed upon GV101 treatment. Conversely, with MDA-MB-231 cells lacking a collective migration phenotype, PyMT cells exhibited a subtle reduction in organised cell migration upon ROCK2 inhibition. Interestingly, PyMT cells seeded on matrices previously primed with GV101 showed a more pronounced effect on collective cell migration.

The role of ROCK2 in stromal vs epithelial cells during cancer cell invasion in 3D matrices.
Figure 1: Experimental schematic of the invasion assay (adapted from the preprint)

To uncouple the effects of stromal vs epithelial cells during matrix invasion by cancer cells, CAFs were treated with the ROCK2 inhibitor either during the matrix contraction phase (early priming) as opposed to epithelial treatment during the invasion phase (late invasion) or in a continuous manner throughout the contraction and invasion phases. Here, early priming significantly decreased cancer cell invasion at levels comparable to continuous treatment. This suggests that stromal ECM remodelling disruption by GV101 is enough to reduce cancer cell invasion.

ROCK2 expression in triple-negative breast cancers
Analysis of TCGA and METABRIC cohorts reveals a poorer median patient survival with high ROCK2 mRNA expression. Additionally, ROCK2 protein expression is significantly increased in breast cancer progression, indicating that high ROCK2 expression in human triple-negative breast cancer patients correlates with poor patient survival.

Significance of the study:

This study highlights the role ROCK2 plays in governing various properties of cancer cells, such as migration, proliferation, and invasion. As such, it puts ROCK2 forward as a potential target to influence both epithelial and stromal cell behaviours.

Tags: cancer, extracellular matrix, mechanotransduction

doi: https://doi.org/10.1242/prelights.42212

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Author's response

David Herrmann shared

  1. Are there any compensatory effects in the expression or activity of other related kinases upon GV101 treatment?

This is a great question. In our manuscript we focus on the consequences of GV101 treatment on a cellular level demonstrating context-dependent effects of GV101 in stromal versus epithelial cells. Future work will assess the downstream signalling pathways and kinase expression/activity induced by GV101 treatment, which we anticipate to be similarly context-dependent as we show on the cellular level.

  1. Are there changes in the properties of the ECM, such as its stiffness and porosity, when CAFs are treated with GV101 during the contraction phase?

This is a great point. We observe that in both mouse and human CAF settings treatment with GV101 during the collagen contraction phase reduces matrix stiffness assessed by unconfined compression analysis (Young’s modulus, Figure 1D and Figure 1K). This reduced matrix stiffness may also contribute to the decrease in cell invasiveness observed in 3D organotypic invasion assays upon GV101 ‘priming’ treatment during the contraction phase (Figure 6)  and is in line with previous work by us and others showing a role for ROCK signalling in matrix stiffness and that changes in matrix stiffness can affect adjacent cell behaviour (Samuel et al. Cancer Cell 2011; Provenzano et al. Journal of Cell Science 2011; Vennin et al. Science Translational Medicine 2017; Murphy et al. Science Advances 2021; Chitty et al. Nature Cancer 2023; Pereira et al. Science Advances 2024).

  1. How would you predict MDA-MB-231 spheroids to behave under GV101 treatment conditions?

While we have not assessed GV101 treatment in MDA-MB-231 spheroids in our current manuscript, we provide data on GV101 treatment in MDA-MB-231 cells growing under anchorage-independent growth (AIG) conditions. Here, we show that GV101 reduces both AIG cluster number and AIG cluster size indicative of a reduction in MDA-MB-231 cell survival and cell proliferation when grown under AIG conditions. We would expect similar effects on MDA-MB-231 spheroids; however, this would require additional future investigation.

Another interesting point is the effect on cell invasiveness when MDA-MB-231 spheroids are e.g. grown in Matrigel. Our current data show that single cell MDA-MB-231 migration across cell-derived matrices is reduced when the cells are treated with GV101 during migration (Figure 4). Interestingly, when MDA-MB-231 cells are allowed to invade into 3D fibroblast-contracted organotypic collagen matrices, GV101 treatment during the invasion phase only is not sufficient to reduce cell invasion and it is GV101 treatment during the collagen contraction phase (and in a chronic treatment setting) that significantly reduces MDA-MB-231 invasion (Figure 6). It could therefore be interesting to assess cell migration and invasion in response to GV101 in MDA-MB-231 spheroids embedded into a range of ECM- and hydrogels to further characterise the context-dependent roles of GV101 in future.

  1. Can you comment on the perturbations to the conventional mechanotransduction pathways in cells seeded on matrices produced by treated stromal cells?

This is a great question. We have previously shown using pancreatic cancer models that the treatment of stromal cells during ECM contraction reduces cell invasiveness while also limiting cell cycle progression, which could be partially attributed to a perturbation of mechanotransduction pathways in cells interacting with a ‘softer’ environment (Vennin et al. Science Translational Medicine 2017; Murphy et al. Science Advances 2021; Pereira et al. Science Advances 2024). Future assessment of conventional mechanotransduction pathways, such as FAK/Src or YAP/TAZ, may provide further clarification on this point.

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List by Rob Hynds

Cellular metabolism

A curated list of preprints related to cellular metabolism at Biorxiv by Pablo Ranea Robles from the Prelights community. Special interest on lipid metabolism, peroxisomes and mitochondria.

 



List by Pablo Ranea Robles

BSCB/BSDB Annual Meeting 2019

Preprints presented at the BSCB/BSDB Annual Meeting 2019

 



List by Dey Lab

MitoList

This list of preprints is focused on work expanding our knowledge on mitochondria in any organism, tissue or cell type, from the normal biology to the pathology.

 



List by Sandra Franco Iborra

Biophysical Society Annual Meeting 2019

Few of the preprints that were discussed in the recent BPS annual meeting at Baltimore, USA

 



List by Joseph Jose Thottacherry

ASCB/EMBO Annual Meeting 2018

This list relates to preprints that were discussed at the recent ASCB conference.

 



List by Dey Lab, Amanda Haage