The main aims of this multi-PI proposal are to characterize the underlying mechanisms the adeno- associated virus (AAV)-hepatocyte interactions in general, and to develop number of optimized recombinant (rAAV) vectors for high-efficiency transduction of hepatocytes with minimal effective dose and with minimal immune response to capsid. In recent years, we have undertaken systematic studies to gain a better understanding of the fundamental molecular mechanisms of AAV-hepatocyte interactions and have made the following significant observations, which form the basis of the current proposal: ? Identified and site-directed mutagenesis of critical surface-exposed tyrosine, serine, threonine residues on AAV capsids, and the development of next generation of highly efficient AAV vectors. ? Demonstrated that of transient suppression of the NF-kB pathway minimized pro-inflammatory response induced by AAV-mediated transduction. ? Observed involvement of the glucocorticoid receptor (GR) pathway in the life cycle of AAV2 vectors. The following three Specific Aims will be pursued:
Specific Aim 1 : Studying of cross-talk between GR and NF-kB pathway during transduction of hepatocytes by optimized AAV8 vectors and possible implementation to immune response reduction.
Specific Aim 2 : Evaluation of safety of optimized AAV8 vectors in human hepatocytes by studying frequency of integration and possible insertional mutagenesis.
Specific Aim 3 : Development of capsid- and genome- optimized AAV8 vectors for efficient transduction of hepatocytes at low dose and with minimal immune response. The knowledge gained from these studies will be directly applicable in the development of the next generation of rAAV vectors for their optimal use in liver-directed gene therapy and particularly for hemophilia B.

Public Health Relevance

The main aim of this proposal is to develop safe and effective vectors based on a human virus, the adeno- associated virus (AAV), which causes no known disease. Recombinant AAV vectors are currently being used in a number of Phase I/II clinical trials for the potential gene therapy of a wide variety of human diseases, and our proposed studies are expected to yield new and useful information towards further development of these vectors, which has relevance to public health.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM119186-02
Application #
9406872
Study Section
Therapeutic Approaches to Genetic Diseases Study Section (TAG)
Program Officer
Okita, Richard T
Project Start
2017-01-01
Project End
2021-12-31
Budget Start
2018-01-01
Budget End
2018-12-31
Support Year
2
Fiscal Year
2018
Total Cost
Indirect Cost
Name
University of Florida
Department
Pediatrics
Type
Schools of Medicine
DUNS #
969663814
City
Gainesville
State
FL
Country
United States
Zip Code
32611
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Krotova, Karina; Marek, George W; Wang, Rejean L et al. (2017) Alpha-1 Antitrypsin-Deficient Macrophages Have Increased Matriptase-Mediated Proteolytic Activity. Am J Respir Cell Mol Biol 57:238-247
Li, Min; Tang, Yuxiao; Wu, Lusha et al. (2017) The hepatocyte-specific HNF4?/miR-122 pathway contributes to iron overload-mediated hepatic inflammation. Blood 130:1041-1051
Rosario, Awilda M; Cruz, Pedro E; Ceballos-Diaz, Carolina et al. (2016) Microglia-specific targeting by novel capsid-modified AAV6 vectors. Mol Ther Methods Clin Dev 3:16026