ArticleMolecular therapy. Methods & clinical development2020
Induction of ER Stress by an AAV5 BDD FVIII Construct Is Dependent on the Strength of the Hepatic-Specific Promoter.
Article in Molecular therapy. Methods & clinical development, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.
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Who cites it
30 citing papers in PubMed, 42 citations in OpenAlex.
- A phase 1/2 safety and efficacy study of TAK-754 gene therapy: The challenge of achieving durable factor VIII expression in haemophilia A clinical trials.Haemophilia : the official journal of the World Federation of Hemophilia · 2025Trial
- Trial
- Clinical immunogenicity in rAAV gene therapy: Insights and implications.Molecular therapy. Advances · 2026Review
- An ER stress-responsive RNA rheostat for programmable gene and mRNA therapies.Cell chemical biology · 2026Article
- Translational insights from nonclinical studies of AAV gene therapies for hemophilia: mechanisms underpinning variability and durability of gene expression.Therapeutic advances in hematology · 2026Review
- Balancing Promise and Peril: Hemophilia Gene Therapy Insights.IUBMB life · 2026Review
- Review
- Identification of a robust promoter in mouse and human hepatocytes by in vivo biopanning of a barcoded AAV library.Molecular therapy : the journal of the American Society of Gene Therapy · 2025Article
- Gene therapy for hemophilia - From basic science to first approvals of "one-and-done" therapies.Molecular therapy : the journal of the American Society of Gene Therapy · 2025Review
- Gene regulation technologies for gene and cell therapy.Molecular therapy : the journal of the American Society of Gene Therapy · 2025Review
- Preclinical development of TAK-754, a high-performance AAV8-based vector expressing coagulation factor VIII.Molecular therapy. Methods & clinical development · 2025Article
- Gene therapy in hemophilia: the dawn of a new era.Research and practice in thrombosis and haemostasis · 2025Review
- Advances in biopharmaceutical products for hemophilia.iScience · 2024Review
- Rescue of the endogenous FVIII expression in hemophilia A mice using CRISPR-Cas9 mRNA LNPs.Molecular therapy. Nucleic acids · 2024Article
- Roctavian gene therapy for hemophilia A.Blood advances · 2024Review
- Optimizing liver health before and after gene therapy for hemophilia A.Blood advances · 2024Review
- Protein overexpression by adeno-associated virus-based gene therapy products in cardiomyocytes induces endoplasmic reticulum stress and myocardial degeneration in mice.Journal of toxicologic pathology · 2024Article
- Pre-clinical evaluation of an enhanced-function factor VIII variant for durable hemophilia A gene therapy in male mice.Nature communications · 2024Article
- AAV Immunotoxicity: Implications in Anti-HBV Gene Therapy.Microorganisms · 2023Review
- CRISPR-Cas9-mediated somatic correction of a one-base deletion in the Ugt1a gene ameliorates hyperbilirubinemia in Crigler-Najjar syndrome mice.Molecular therapy. Methods & clinical development · 2023Article
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Authors and funding
21 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Adeno-associated virus 5 (AAV5)-human factor VIII-SQ (hFVIII-SQ; valoctocogene roxaparvovec) is an AAV-mediated product under evaluation for treatment of severe hemophilia A, which contains a B-domain-deleted hFVIII (hFVIII-SQ) transgene and a hybrid liver-specific promotor (HLP). To increase FVIII-SQ expression and reduce the vector dose required, a stronger promoter may be considered. However, because FVIII-SQ is a protein known to be difficult to fold and secrete, this could potentially induce endoplasmic reticulum (ER) stress. We evaluated the effect of two AAV5-hFVIII-SQ vectors with different liver-specific promoter strength (HLP << 100ATGB) on hepatic ER stress in mice. Five weeks after receiving vehicle or vector, the percentage of transduced hepatocytes and levels of liver hFVIII-SQ DNA and RNA increased dose dependently for both vectors. At lower doses, plasma hFVIII-SQ protein levels were higher for 100ATGB. This difference was attenuated at the highest dose. For 100ATGB, liver hFVIII-SQ protein accumulated dose dependently, with increased expression of ER stress markers at the highest dose, suggesting hepatocytes reached or exceeded their capacity to fold/secrete hFVIII-SQ. These data suggest that weaker promoters may require relatively higher doses to distribute expression load across a greater number of hepatocytes, whereas relatively stronger promoters may produce comparable levels of FVIII in fewer hepatocytes, with potential for ER stress.
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