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Strategy for the optimization of read-through therapy for junctional epidermolysis bullosa with COL17A1 nonsense mutation.
Journal of Investigative Dermatology 2024 March 23
The read-through therapy suppresses premature termination codons and induces read-through activity consequently restoring missing proteins. Aminoglycosides are widely studied as read-through drugs in different human genetic disorders including hereditary skin diseases. Our previous work revealed that aminoglycosides have effect on COL17A1 nonsense mutations and represent a therapeutic option to alleviate disease severity. However, the amount of restored type XVII collagen (C17) in C17 deficient junctional epidermolysis bullosa (JEB-C17) keratinocytes was less than 1% relative to normal keratinocytes and was achieved only after high dose gentamicin treatment, which induced deep transcriptional changes. Therefore, in this study, we designed a strategy for the read-through therapy to challenge with aminoglycosides limitation factors in clinical use and the chronic inflammation in JEB-C17 patients. We developed TRID-C5 containing low dosage of aminoglycosides, CC-90009, NMDI-14, melatonin and apocynin that was able to induce about 20% of missing C17 without cell toxicity and effect on in vitro wound closure. TRID-C5 significantly induced COL17A1 expression and reverted the proinflammatory phenotype of JEB-C17 keratinocytes. Evaluation of this drug cocktail regarding its stability, penetration and efficacy as a topical treatment remains to be determined. TRID-C5 might represent an improved therapeutic strategy for JEB and for other genetic skin disorders.
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