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Unsaturated Aldehyde Acrolein Promotes Retinal Glial Cell Migration
Miyuki Murata1,2, Kousuke Noda1,2, Shiho Yoshida1,2
1Laboratory of Ocular Cell Biology and Visual Science, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
Investigative Ophthalmology & Visual Science
|October 26, 2019
Summary
Acrolein exposure at moderate levels stimulates retinal Müller glial cell migration by increasing CXCL1 production. This pathway is implicated in proliferative diabetic retinopathy, suggesting a potential therapeutic target.
Area of Science:
- Ophthalmology
- Cell Biology
- Toxicology
Background:
- Retinal glial cells, specifically Müller cells, play crucial roles in retinal health and disease.
- Unsaturated aldehydes like acrolein are known environmental toxins that can impact cellular functions.
- Glial cell migration is a key process in various retinal pathologies, including proliferative diabetic retinopathy (PDR).
Purpose of the Study:
- To investigate the impact of acrolein on retinal Müller glial cell migration.
- To elucidate the molecular mechanisms underlying acrolein-induced glial cell migration.
- To explore the role of the CXCL1-CXCR2 axis in this process and its relevance to PDR.
Main Methods:
- TR-MUL5 cells were used to assess viability and migration following acrolein stimulation.
- DNA microarray analysis identified changes in migration-related gene expression.
- RT-PCR, ELISA, and immunostaining were employed to validate findings and examine protein expression.
- Inhibitors and blockers of the CXCL1-CXCR2 axis were used to assess their effect on migration.
- CXCL1 levels in vitreous fluid from PDR patients were measured.
Main Results:
- Acrolein at sublethal concentrations (25-50 μM) induced Müller glial cell migration and increased CXCL1 production.
- High acrolein concentration (100 μM) reduced cell viability.
- CXCL1 levels were significantly elevated in the vitreous of PDR patients.
- CXCL1 and its receptor CXCR2 were found in glial cells within fibrovascular tissues of PDR patients.
- Neutralization of the CXCL1-CXCR2 axis inhibited acrolein-induced glial cell migration.
Conclusions:
- Acrolein promotes retinal Müller glial cell migration through the upregulation of CXCL1.
- The CXCL1-CXCR2 signaling pathway is a critical mediator of acrolein-induced glial cell migration.
- These findings highlight a potential mechanism contributing to PDR pathogenesis and suggest therapeutic avenues targeting this pathway.
