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Ceramide compensation by ceramide synthases preserves retinal function and structure in a retinal dystrophy mouse
Xinye Qian1,2, Tanmay Srinivasan3, Jessica He3
1Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
Disease Models & Mechanisms
|July 19, 2023
Summary
The non-canonical ceramide synthase TLCD3B and canonical ceramide synthases (CerS) have partially redundant roles in retinal health. Maintaining specific ceramide species levels is crucial for photoreceptor function and preventing degeneration.
Area of Science:
- Biochemistry
- Molecular Biology
- Ophthalmology
Background:
- Ceramides are implicated in photoreceptor dysfunction and cell death.
- TLCD3B is a non-canonical ceramide synthase, distinct from the six canonical CerS.
- Tlcd3b-/- mice show retinal dysfunction and degeneration, unlike canonical CerS-deficient models.
Purpose of the Study:
- To investigate the interaction between TLCD3B and canonical CerS in the retina.
- To determine if overall ceramide levels or specific ceramide species are critical for photoreceptor degeneration.
Main Methods:
- Subretinal injection of recombinant adeno-associated virus 8 vectors carrying Cers2, Cers4, and Cers5 genes into Tlcd3b-/- mice.
- Assessment of retinal function using electroretinogram responses.
- Evaluation of retinal morphology.
Main Results:
- All three rAAV8-CerS vectors improved electroretinogram responses in Tlcd3b-/- mice.
- Only rAAV8-CerS5 injection retained retinal morphology in Tlcd3b-/- mice.
- TLCD3B and CerSs exhibit partially redundant roles, and specific ceramide species impact retinal cells differently.
Conclusions:
- The maintenance of the overall ceramide profile, not just total levels, is critical for retinal function.
- Different ceramide species have distinct roles in photoreceptor health and degeneration.
- TLCD3B and canonical CerS likely collaborate to maintain retinal homeostasis.
