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arxiv: 2512.22923 · v2 · submitted 2025-12-28 · ❄️ cond-mat.soft · physics.bio-ph

Myofibroblasts slow down defect recombination dynamics in mixed cell monolayers

Zhaofei Zheng , Yuxin Luo , Juan Chen , Yimin Luo This is my paper

Pith reviewed 2026-05-16 20:16 UTC · model grok-4.3

classification ❄️ cond-mat.soft physics.bio-ph
keywords myofibroblaststopological defectscell monolayersdefect recombinationfibrosismechanotransductioncollective cell dynamicsnematic order
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The pith

Myofibroblasts slow defect recombination in fibroblast monolayers by localizing at less mobile -1/2 topological defects.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper examines how adding myofibroblasts, the slower and more contractile cells linked to fibrosis, changes the collective ordering in mixed monolayers with fibroblasts. It shows that higher myofibroblast fractions increase overall disorder and slow the rate at which pairs of topological defects annihilate each other. The slowdown occurs because myofibroblasts preferentially sit at the less mobile negatively charged -1/2 defects, raising local friction there while fibroblasts occupy the more mobile +1/2 defects. This localization pattern is observed both in flat monolayers and on microgrooved surfaces, pointing to combined effects of single-cell sensing and cell-cell interactions.

Core claim

In co-cultured monolayers myofibroblasts preferentially localize at negatively charged -1/2 defects while fibroblasts localize at +1/2 defects; this selective placement increases local friction at the less mobile defects and thereby slows overall defect recombination dynamics as myofibroblast fraction rises.

What carries the argument

Preferential localization of myofibroblasts at -1/2 topological defects, which raises local friction and impedes defect mobility.

If this is right

  • Increasing myofibroblast fraction raises disorder strength and reduces defect recombination speed.
  • On microgrooved substrates higher myofibroblast density produces poorer global alignment.
  • Myofibroblast placement at -1/2 defects lowers local compressive stress, visible in reduced activity of downstream mechanotransducers.
  • The mixed-phenotype system demonstrates that cell-type-specific defect affinity can tune collective relaxation timescales.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same localization bias could stabilize disordered regions in fibrotic tissue and contribute to its mechanical stiffening.
  • Interfering with myofibroblast-defect affinity might accelerate ordering in wound-healing contexts where rapid alignment is beneficial.
  • Comparable selective defect occupation could appear in other co-cultures where one cell type is markedly more contractile than the other.

Load-bearing premise

The observed preferential localization and resulting slowdown arise primarily from single-cell mechanosensing and cell-cell interactions rather than from uncontrolled differences in cell size, adhesion strength, or co-culture artifacts.

What would settle it

A controlled experiment in which myofibroblasts and fibroblasts are mixed at varying ratios yet show equal localization probabilities at +1/2 and -1/2 defects and unchanged recombination rates would falsify the claim.

Figures

Figures reproduced from arXiv: 2512.22923 by Juan Chen, Yimin Luo, Yuxin Luo, Zhaofei Zheng.

Figure 1
Figure 1. Figure 1: (a) Fluorescent micrographs of mixed fibroblast (magenta) and myofibroblast (green) mono [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: (a) The density of topological defects decreases over time and eventually plateaus at a finite [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (a) Schematic of the rubbing protocol used to align cells, with cells orienting along the rubbing [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (a-b) Cell number density for (a) fibroblasts and (b) myofibroblasts. (c) Combined density [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Then we compute the local density of myofibroblasts [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: Cells cultured on LCE fibers with patterns of topological charges (a) + [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
read the original abstract

Cellular organization and mechanotransduction pathways are crucial regulators of tissue morphogenesis, whereas their dysregulation contributes to pathologies. Overactive myofibroblasts are key drivers of fibrosis, yet how their presence alters collective cellular ordering remains unclear. Owing to steric interactions, elongated cells exhibit local order. Topological defects, where alignment is disrupted, have been postulated to serve as mechanical centers. In this study, we examine how incorporating slower moving myofibroblast phenotype impacts defect relaxation in monolayers consisting of co-cultured fibroblasts and myofibroblasts. In this system, myofibroblasts act as the less active component. Increasing their fraction increases disorder strength and slows defect recombination. On microgrooved surfaces, higher myofibroblast concentrations lead to worse alignment, suggesting single-cell mechanosensing and cell-cell interactions act jointly. Furthermore, we found that myofibroblasts preferentially localize at negatively charged -1/2 defects, whereas fibroblasts localize at +1/2 defects. Consequently, the slowdown of recombination dynamics can be partially attributed to myofibroblasts' preferential association with the less mobile -1/2 defects, increasing local friction and impeding defect mobility. This localization may also reduce compressive stress on myofibroblasts, as indicated by immunofluorescence of a downstream mechanotransducer. This work provides insights into possible connections between topological defects and cell motility in mixed phenotype monolayers.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript examines co-cultures of fibroblasts and myofibroblasts in monolayers, reporting that higher myofibroblast fractions increase disorder strength and slow topological defect recombination. It claims myofibroblasts preferentially localize at -1/2 defects (fibroblasts at +1/2), attributing the slowdown to increased local friction from this association, with supporting observations on microgrooved surfaces and immunofluorescence of a mechanotransducer.

Significance. If the localization and dynamics results hold with proper controls, the work would connect cell-phenotype differences to nematic defect mobility in active matter, with relevance to fibrosis and tissue morphogenesis. The use of mixed-phenotype monolayers and microgrooved substrates provides a platform for testing single-cell versus collective effects.

major comments (3)
  1. [Abstract] Abstract and Results sections: the central claims of slowed recombination and preferential localization are presented as direct observations, yet the provided summary contains no quantitative metrics (e.g., recombination rates, localization probabilities, error bars, or p-values), undermining assessment of effect sizes and statistical robustness.
  2. [Results] Results (localization and mechanosensing): the attribution of preferential -1/2 occupancy to mechanosensing and cell-cell interactions lacks controls for passive factors such as cell area, aspect ratio, or integrin-mediated adhesion differences; no size-matched or adhesion-blocked co-culture data are described, leaving open the possibility that steric exclusion or differential adhesion drives the observed bias.
  3. [Discussion] Discussion of friction mechanism: the claim that myofibroblast association with less mobile -1/2 defects increases local friction and impedes mobility is not supported by direct measurements of defect velocity distributions or friction estimates; without these, the partial attribution remains qualitative.
minor comments (2)
  1. [Abstract] Clarify the sign convention for 'negatively charged -1/2 defects' in the context of nematic order parameter to avoid ambiguity for readers outside active-matter biology.
  2. [Figures] Ensure all figures reporting trends include scale bars, error bars, sample sizes, and statistical tests; add a methods subsection detailing cell-size quantification and co-culture ratios.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive comments, which have helped us improve the clarity and rigor of the manuscript. We address each major point below and indicate the revisions made.

read point-by-point responses

  1. Referee: [Abstract] Abstract and Results sections: the central claims of slowed recombination and preferential localization are presented as direct observations, yet the provided summary contains no quantitative metrics (e.g., recombination rates, localization probabilities, error bars, or p-values), undermining assessment of effect sizes and statistical robustness.

    Authors: We agree that the abstract would benefit from explicit quantitative metrics. The Results section and figures already report recombination timescales (with standard errors), localization probabilities (with error bars and statistical tests), and disorder measures as functions of myofibroblast fraction. We have revised the abstract to include representative values (e.g., recombination slowdown factor and localization bias percentages) along with references to the supporting statistics. revision: yes

  2. Referee: [Results] Results (localization and mechanosensing): the attribution of preferential -1/2 occupancy to mechanosensing and cell-cell interactions lacks controls for passive factors such as cell area, aspect ratio, or integrin-mediated adhesion differences; no size-matched or adhesion-blocked co-culture data are described, leaving open the possibility that steric exclusion or differential adhesion drives the observed bias.

    Authors: This concern is valid. Our microgrooved-substrate experiments show that increasing myofibroblast fraction disrupts alignment even under geometric confinement, and immunofluorescence of the mechanotransducer supports a mechanosensing contribution. However, we did not include adhesion-blocking or size-matched controls, so passive steric or adhesion effects cannot be fully ruled out. We have added an explicit discussion of these alternative mechanisms as a limitation and clarified that the mechanosensing interpretation is supported but not exclusively proven by the current data. revision: partial

  3. Referee: [Discussion] Discussion of friction mechanism: the claim that myofibroblast association with less mobile -1/2 defects increases local friction and impedes mobility is not supported by direct measurements of defect velocity distributions or friction estimates; without these, the partial attribution remains qualitative.

    Authors: We concur that the friction interpretation is qualitative. It rests on the observed preferential localization of myofibroblasts at -1/2 defects (known from prior literature to be less mobile) together with the measured slowdown in recombination. No direct velocity histograms or friction coefficients are provided. We have revised the Discussion to state this explicitly as an interpretation, to qualify the language as partial attribution, and to cite additional references on defect mobility in cell monolayers. revision: yes

Circularity Check

0 steps flagged

No significant circularity in experimental observations

full rationale

The manuscript presents direct experimental results on cell localization at topological defects and changes in recombination dynamics in mixed monolayers. No equations, parameter fits, or derivations appear that would reduce any claimed prediction to its own inputs by construction. Attribution of slowdown to preferential localization is an interpretive statement based on imaging data, not a self-referential mathematical step. Self-citations, if present, are not load-bearing for the core claims, which rest on observable phenotypes rather than prior author theorems or ansatzes.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the standard soft-matter assumption that elongated cells form nematic order via steric interactions, plus the domain assumption that defect recombination rate is limited by local friction and mobility differences between defect types.

axioms (1)
  • domain assumption Elongated cells exhibit local order due to steric interactions, allowing topological defects to form.
    Invoked in the first paragraph of the abstract as the basis for studying defects in monolayers.

pith-pipeline@v0.9.0 · 5551 in / 1252 out tokens · 33707 ms · 2026-05-16T20:16:42.401726+00:00 · methodology

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