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Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration of laboratory and spiny mice.

ABSTRACT: Tissue regeneration is a process that recapitulates and restores organ structure and function. Although previous studies have demonstrated wound-induced hair neogenesis (WIHN) in laboratory mice (Mus), the regeneration is limited to the center of the wound unlike those observed in African spiny (Acomys) mice. Tissue mechanics have been implicated as an integral part of tissue morphogenesis. Here, we use the WIHN model to investigate the mechanical and molecular responses of laboratory and African spiny mice, and report these models demonstrate opposing trends in spatiotemporal morphogenetic field formation with association to wound stiffness landscapes. Transcriptome analysis and K14-Cre-Twist1 transgenic mice show the Twist1 pathway acts as a mediator for both epidermal-dermal interactions and a competence factor for periodic patterning, differing from those used in development. We propose a Turing model based on tissue stiffness that supports a two-scale tissue mechanics process: (1) establishing a morphogenetic field within the wound bed (mm scale) and (2) symmetry breaking of the epidermis and forming periodically arranged hair primordia within the morphogenetic field (μm scale). Thus, we delineate distinct chemo-mechanical events in building a Turing morphogenesis-competent field during WIHN of laboratory and African spiny mice and identify its evo-devo advantages with perspectives for regenerative medicine.

SUBMITTER: Harn HI

PROVIDER: S-EPMC8110808 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration

Project description:This SuperSeries is composed of the SubSeries listed below.

2021-02-19 | GSE159939 | GEO

Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration [scRNA-seq]

Project description:Tissue regeneration is a process that recapitulates the molecular and mechanical aspects of development and evolution. We use the wound-induced hair neogenesis (WIHN) model to investigate the mechanical and molecular responses of the laboratory (Mus) and African spiny (Acomys) mice. Laboratory and spiny mice showed an opposite trend of spatiotemporal morphogenetic field for WIHN during wound healing, and wound stiffness gradient across the whole wound bed predicated pattern of hair formation. Using bulk and single-cell RNA-seq analysis and K14-Cre-Twist1 transgenic mice, we identified the central role of the Twist1 pathway as the mediator of epidermal-dermal interaction and the emergence of periodic hair primordia. Lastly, we generated a Turing model with an underlying measure of stiffness to support a two-scale tissue mechanic model to explain the setup of a morphogenetic field from a wound bed (mm scale) or periodically arranged hair primordia from a morphogenetic field (μm scale). Delineating the common and distinct chemo-mechanical events during regenerative wound healing between laboratory and African spiny mice reveal its evo-devo advantages, which provide new perspectives for regenerative medicine.

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Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration [bulk RNA-seq]

2021-02-19 | GSE159938 | GEO

Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration

Project description:Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration

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Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration [scRNA-seq]

Project description:Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration [scRNA-seq]

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Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration [bulk RNA-seq]

Project description:Symmetry breaking of tissue mechanics in wound induced hair follicle regeneration [bulk RNA-seq]

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Left-right symmetry breaking in tissue morphogenesis via cytoskeletal mechanics.

Project description:RationaleLeft-right (LR) asymmetry is ubiquitous in animal development. Cytoskeletal chirality was recently reported to specify LR asymmetry in embryogenesis, suggesting that LR asymmetry in tissue morphogenesis is coordinated by single- or multi-cell organizers. Thus, to organize LR asymmetry at multiscale levels of morphogenesis, cells with chirality must also be present in adequate numbers. However, observation of LR asymmetry is rarely reported in cultured cells.ObjectivesUsing cultured vascular mesenchymal cells, we tested whether LR asymmetry occurs at the single cell level and in self-organized multicellular structures.Methods and resultsUsing micropatterning, immunofluorescence revealed that adult vascular cells polarized rightward and accumulated stress fibers at an unbiased mechanical interface between adhesive and nonadhesive substrates. Green fluorescent protein transfection revealed that the cells each turned rightward at the interface, aligning into a coherent orientation at 20° relative to the interface axis at confluence. During the subsequent aggregation stage, time-lapse videomicroscopy showed that cells migrated along the same 20° angle into neighboring aggregates, resulting in a macroscale structure with LR asymmetry as parallel, diagonal stripes evenly spaced throughout the culture. Removal of substrate interface by shadow mask-plating, or inhibition of Rho kinase or nonmuscle myosin attenuated stress fiber accumulation and abrogated LR asymmetry of both single-cell polarity and multicellular coherence, suggesting that the interface triggers asymmetry via cytoskeletal mechanics. Examination of other cell types suggests that LR asymmetry is cell-type specific.ConclusionsOur results show that adult stem cells retain inherent LR asymmetry that elicits de novo macroscale tissue morphogenesis, indicating that mechanical induction is required for cellular LR specification.

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Hair follicle and interfollicular epidermal stem cells make varying contributions to wound regeneration.

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Immune modulation of hair follicle regeneration.

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