Using Adeno-associated Virus as a Tool to Study Retinal Barriers in Disease

Area of Science:

• Ophthalmology
• Neuroscience
• Cell Biology

Background:

• Müller cells are vital glial cells forming retinal barriers like the inner limiting membrane (ILM) and blood-retinal barrier (BRB).
• Alterations in the BRB and ILM are implicated in various retinal diseases.
• Current methods for assessing BRB integrity lack detail on permeability to large molecules and ILM status.

Purpose of the Study:

• To develop and validate an Adeno-Associated Virus (AAV)-based method for evaluating BRB and ILM integrity.
• To assess the utility of AAV variants (AAV5 and ShH10) in studying these retinal barriers.

Main Methods:

• Utilized two AAV variants, AAV5 and ShH10, for targeted Müller cell and photoreceptor labeling.
• Administered AAVs intravitreally to assess their tropism and ability to cross retinal barriers.
• Combined AAV delivery with immunohistochemistry and blood-DNA analysis.

Main Results:

• AAV5 shows limited penetration across an intact ILM.
• ShH10 efficiently labels Müller glia and demonstrates enhanced delivery in retinas with compromised ILM.
• The AAV-based approach provides insights into BRB permeability to larger molecules and ILM status.

Conclusions:

• AAV vectors, particularly ShH10, are valuable tools for investigating retinal barrier function and integrity.
• This method offers a more comprehensive assessment of BRB and ILM status compared to traditional assays.
• Understanding retinal barrier dynamics is crucial for diagnosing and treating blinding diseases.