Damage-Induced Senescent Immune Cells Regulate Regeneration of the Zebrafish Retina

Overview

Journal Aging Biol

Date 2024 Aug 19

PMID 39156966

Authors

Gregory J Konar

Zachary Flickinger

Shivani Sharma

Kyle T Vallone

Charles E Lyon Jr

Claire Doshier

Audrey Lingan

William Lyon

James G Patton

Affiliations

Soon will be listed here.

Abstract

Zebrafish spontaneously regenerate their retinas in response to damage through the action of Müller glia (MG). Even though MG are conserved in higher vertebrates, the capacity to regenerate retinal damage is lost. Recent work has focused on the regulation of inflammation during tissue regeneration, with temporal roles for macrophages and microglia. Senescent cells that have withdrawn from the cell cycle have mostly been implicated in aging but are still metabolically active, releasing a variety of signaling molecules as part of the senescence-associated secretory phenotype. Here, we discover that in response to retinal damage, a subset of cells expressing markers of microglia/macrophages also express markers of senescence. These cells display a temporal pattern of appearance and clearance during retina regeneration. Premature removal of senescent cells by senolytic treatment led to a decrease in proliferation and incomplete repair of the ganglion cell layer after N-methyl-D-aspartate damage. Our results demonstrate a role for modulation of senescent cell responses to balance inflammation, regeneration, plasticity, and repair as opposed to fibrosis and scarring.

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