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Distinct origin and region-dependent contribution of stromal fibroblasts to fibrosis following traumatic injury in mice.


ABSTRACT: Fibrotic scar tissue formation occurs in humans and mice. The fibrotic scar impairs tissue regeneration and functional recovery. However, the origin of scar-forming fibroblasts is unclear. Here, we show that stromal fibroblasts forming the fibrotic scar derive from two populations of perivascular cells after spinal cord injury (SCI) in adult mice of both sexes. We anatomically and transcriptionally identify the two cell populations as pericytes and perivascular fibroblasts. Fibroblasts and pericytes are enriched in the white and gray matter regions of the spinal cord, respectively. Both cell populations are recruited in response to SCI and inflammation. However, their contribution to fibrotic scar tissue depends on the location of the lesion. Upon injury, pericytes and perivascular fibroblasts become activated and transcriptionally converge on the generation of stromal myofibroblasts. Our results show that pericytes and perivascular fibroblasts contribute to the fibrotic scar in a region-dependent manner.

SUBMITTER: Holl D 

PROVIDER: S-EPMC11239523 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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Distinct origin and region-dependent contribution of stromal fibroblasts to fibrosis following traumatic injury in mice.

Holl Daniel D   Hau Wing Fung WF   Julien Anais A   Banitalebi Shervin S   Kalkitsas Jannis J   Savant Soniya S   Llorens-Bobadilla Enric E   Herault Yann Y   Pavlovic Guillaume G   Amiry-Moghaddam Mahmood M   Dias David Oliveira DO   Göritz Christian C  

Nature neuroscience 20240607 7


Fibrotic scar tissue formation occurs in humans and mice. The fibrotic scar impairs tissue regeneration and functional recovery. However, the origin of scar-forming fibroblasts is unclear. Here, we show that stromal fibroblasts forming the fibrotic scar derive from two populations of perivascular cells after spinal cord injury (SCI) in adult mice of both sexes. We anatomically and transcriptionally identify the two cell populations as pericytes and perivascular fibroblasts. Fibroblasts and peric  ...[more]

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