ArticleFrontiers in cell and developmental biology2025
Loss of a primary cilia protein ARL13B promotes TGFβ-1 induced EMT of RPE in proliferative vitreoretinopathy via increasing Smad3 expression.
Article in Frontiers in cell and developmental biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Proliferative vitreoretinopathy (PVR) is a major complication of rhegmatogenous retinal detachment. Epithelial-mesenchymal transition (EMT) of retinal pigment epithelial (RPE) plays a central role in PVR pathogenesis. This study aims to investigate the effect of ADP-ribosylation factor-like 13B (ARL13B) on RPE EMT in PVR. Methods: The expression of ARL13B in PVR specimens was analyzed by immunofluorescence (IF) staining. The effect of ARL13B on RPE EMT was assessed by IF staining and Western blot. The proliferation and migration of RPE were measured with EdU and transwell and scratch assays, respectively. The EMT-related transcriptome was analyzed by bulk RNAseq. An intravitreal injection mouse model of PVR was used to investigate the role of ARL13B in PVR formation. Results: Immunofluorescence revealed significantly reduced ARL13B levels in α-SMA-positive cells as compared with Pan-CK-positive cells in an epiretinal membrane derived from retinal tears. During EMT, TGFβ1 treatment remarkably reduced ARL13B expression and shortened the length of cilia in RPE cells. In line with this, ARL13B knockdown (KD) decreased the length of cilia and enhanced TGFβ1-induced EMT, evidenced by morphology change and a globally upregulated EMT-related gene expression in RPEs. Moreover, ARL13B KD enhanced TGFβ1-induced RPE proliferation and migration. Consistently, ARL13B KD promoted PVR formation Conclusion: This study demonstrated a crucial role of ARL13B on TGFβ1-induced RPE EMT, highlighting the importance of ARL13B in PVR formation.
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