Heparin-binding Epidermal Growth Factor and Fibroblast Growth Factor 2 Rescue Müller Glia-derived Progenitor Cell Formation in Microglia- and Macrophage-ablated Chick Retinas

Overview

Journal Development

Specialty Biology

Date 2023 Nov 16

PMID 37971210

Authors

Heithem M El-Hodiri

James R Bentley

Alana G Reske

Olivia B Taylor

Isabella Palazzo

Warren A Campbell

Nicklaus R Halloy

Andy J Fischer

Affiliations

Soon will be listed here.

Abstract

Recent studies have demonstrated the impact of pro-inflammatory signaling and reactive microglia/macrophages on the formation of Müller glial-derived progenitor cells (MGPCs) in the retina. In chick retina, ablation of microglia/macrophages prevents the formation of MGPCs. Analyses of single-cell RNA-sequencing chick retinal libraries revealed that quiescent and activated microglia/macrophages have a significant impact upon the transcriptomic profile of Müller glia (MG). In damaged monocyte-depleted retinas, MG fail to upregulate genes related to different cell signaling pathways, including those related to Wnt, heparin-binding epidermal growth factor (HBEGF), fibroblast growth factor (FGF) and retinoic acid receptors. Inhibition of GSK3β, to simulate Wnt signaling, failed to rescue the deficit in MGPC formation, whereas application of HBEGF or FGF2 completely rescued the formation of MGPCs in monocyte-depleted retinas. Inhibition of Smad3 or activation of retinoic acid receptors partially rescued the formation of MGPCs in monocyte-depleted retinas. We conclude that signals produced by reactive microglia/macrophages in damaged retinas stimulate MG to upregulate cell signaling through HBEGF, FGF and retinoic acid, and downregulate signaling through TGFβ/Smad3 to promote the reprogramming of MG into proliferating MGPCs.

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