Total rod ERG suppression with high dose compassionate Fenretinide usage
Abstract
Fenretinide is a synthetic retinoid that interferes with the attachment of retinol to retinol binding protein. It may inhibit accumulation of A2E and lipofuscin, and is proposed as therapy for Stargardt disease. It is currently used for cancer therapy, and mild depression of rod function and dark adaptation is a side effect at standard dosage. We studied two youngsters (aged between 12 and 13) receiving high doses as compassionate treatment for neuroblastoma: 800 mg daily for 1 out of every 3 weeks, for roughly 2 years. Goldmann-Weekers dark adaptometry, ISCEV standard ERG and mfERG were performed, and blood was analyzed for vitamin A. Neither child complained of night blindness or showed retinal fundus abnormalities. On initial exam, dark adaptation thresholds were elevated by 3 log units, and there were no detectable rod ERG responses. However, cone responses and mfERG were normal. Retesting one subject 3 months after stopping the drug revealed normal rod thresholds (slightly delayed) and low normal rod ERG responses. Serum vitamin A levels were normal from both subjects, but there is no record of whether the samples were drawn during cycles on or off drug. Our study demonstrates that high dose Fenretinide can suppress rod function quite completely, although serum vitamin A and rod function apparently return to normal or near normal levels rapidly once the drug is stopped. It is intriguing that cone function and access to vitamin A seems largely independent of Fenretinide effects on retinol availability.
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Inhibiting RPE65 or RBP4 causes reversible night blindness as a side effect.
“As a side effect, reversible night blindness occurs [101,102,103,104].”
From The Role of Vitamin A in Retinal Diseases (2022) · cites this paper as [101]
Inhibiting RPE65 or RBP4 slows the visual cycle, deprives photoreceptors of 11-cis-retinal, and consequently reduces accumulation of toxic A2E.
“An example is slowing the visual cycle by inhibiting RPE65 or RBP4, which deprives photoreceptors of 11-cis-retinal and consequently reduces the accumulation of toxic A2E.”
From The Role of Vitamin A in Retinal Diseases (2022) · cites this paper as [101]
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- Authors
- Marmor, M. F., Jain, A., & Moshfeghi, D.
- Affiliations
- Stanford Medicine (US)
- Corresponding author
- Marmor, Michael F.
- Venue
- Documenta Ophthalmologica
- Published
- 2008-06-04
- Volume
- 117
- Issue
- 3
- Pages
- 257-261
- ISSN
- 0012-4486 (ISSN-L)
- 1573-2622
- OpenAlex
- W2108217633
- Cited by
- 18
- References
- 21
- Citations by year
- 2022: 2 · 2021: 1 · 2018: 2 · 2017: 2 · 2015: 2 · 2014: 3 · 2012: 2
- FWCI
- 0.55
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Documenta Ophthalmologica (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
- Health Sciences › Medicine › Ophthalmology › Drug-Induced Ocular Toxicity
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
- Keywords
- fenretinide, rod photoreceptor function, dark adaptation, vitamin A, retinol-binding protein, neuroblastoma, children, retinal function recovery, cone function, Stargardt disease
- MeSH terms
- Adolescent, Antineoplastic Agents, Child, Dark Adaptation, Electroretinography, Female, Humans, Male, Neuroblastoma, Retinal Diseases, Vitamin A, Fenretinide, Retinal Rod Photoreceptor Cells
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