scholarly journals Strategies for improving the transduction efficiency of single-stranded adeno-associated virus vectors in vitro and in vivo

Gene Therapy ◽  
2008 ◽  
Vol 15 (18) ◽  
pp. 1287-1293 ◽  
Author(s):  
G R Jayandharan ◽  
L Zhong ◽  
B Li ◽  
B Kachniarz ◽  
A Srivastava
Keyword(s):  
Transduction Efficiency ◽  
Adeno Associated Virus ◽  
Virus Vectors

scholarly journals Characterization of Tissue Tropism Determinants of Adeno-Associated Virus Type 1

2003 ◽  
Vol 77 (4) ◽  
pp. 2768-2774 ◽  
Author(s):  
Bernd Hauck ◽  
Weidong Xiao
Keyword(s):  
Amino Acids ◽  
Transduction Efficiency ◽  
Antigenic Determinants ◽  
Tissue Tropism ◽  
Heparin Binding ◽  
Adeno Associated Virus ◽  
Heparin Binding Domain

ABSTRACT Muscle is an attractive target for gene delivery because of its mass and because vectors can be delivered in a noninvasive fashion. Adeno-associated virus (AAV) has been shown to be effective for muscle-targeted gene transfer. Recent progress in characterization of AAV serotype 1 (AAV1) and AAV6 demonstrated that these two AAV serotypes are far more efficient in transducing muscle than is the traditionally used AAV2. Since all cis elements are identical in these vectors, the potential determinants for their differences in transducing muscle appear to be located within the AAV capsid proteins. In the present study, a series of AAV capsid mutants were generated to identify the major regions affecting AAV transduction efficiency in muscle. Replacement of amino acids 350 to 736 of AAV2 VP1 with the corresponding amino acids from VP1 of AAV1 resulted in a hybrid vector that behaved very similarly to AAV1 in vitro and in vivo in muscle. Characterization of additional mutants carrying smaller regions of the AAV1 VP1 amino acid sequence in the AAV2 capsid protein suggested that amino acids 350 to 430 of VP1 function as a major tissue tropism determinant. Further analysis showed that the heparin binding domain and the major antigenic determinants in the AAV capsid region were not necessary for the efficiency of AAV1 transduction of muscle.

scholarly journals The 37/67-Kilodalton Laminin Receptor Is a Receptor for Adeno-Associated Virus Serotypes 8, 2, 3, and 9

2006 ◽  
Vol 80 (19) ◽  
pp. 9831-9836 ◽  
Author(s):  
Bassel Akache ◽  
Dirk Grimm ◽  
Kusum Pandey ◽  
Stephen R. Yant ◽  
Hui Xu ◽  
...  
Keyword(s):  
Gene Therapy ◽  
Cultured Cells ◽  
Human Gene ◽  
Laminin Receptor ◽  
Transduction Efficiency ◽  
Adeno Associated Virus ◽  
Virus Serotype ◽  
Tumor Gene

ABSTRACT Adeno-associated virus serotype 8 (AAV8) is currently emerging as a powerful gene transfer vector, owing to its capability to efficiently transduce many different tissues in vivo. While this is believed to be in part due to its ability to uncoat more readily than other AAV serotypes such as AAV2, understanding all the processes behind AAV8 transduction is important for its application and optimal use in human gene therapy. Here, we provide the first report of a cellular receptor for AAV8, the 37/67-kDa laminin receptor (LamR). We document binding of LamR to AAV8 capsid proteins and intact virions in vitro and demonstrate its contribution to AAV8 transduction of cultured cells and mouse liver in vivo. We also show that LamR plays a role in transduction by three other closely related serotypes (AAV2, -3, and -9). Sequence and deletion analysis allowed us to map LamR binding to two protein subdomains predicted to be exposed on the AAV capsid exterior. Use of LamR, which is constitutively expressed in many clinically relevant tissues and is overexpressed in numerous cancers, provides a molecular explanation for AAV8's broad tissue tropism. Along with its robust transduction efficiency, our findings support the continued development of AAV8-based vectors for clinical applications in humans, especially for tumor gene therapy.

scholarly journals Inflammation and Immune Response of Intra-Articular Serotype 2 Adeno-Associated Virus or Adenovirus Vectors in a Large Animal Model

Arthritis ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Akikazu Ishihara ◽  
Jeffrey S. Bartlett ◽  
Alicia L. Bertone
Keyword(s):  
Joint Inflammation ◽  
Joint Fluid ◽  
Transduction Efficiency ◽  
Large Animal ◽  
Synovial Cells ◽  
Gene Transduction ◽  
Adeno Associated Virus ◽  
Adenovirus Vectors

Intra-articular gene therapy has potential for the treatment of osteoarthritis and rheumatoid arthritis. To quantify in vitro relative gene transduction, equine chondrocytes and synovial cells were treated with adenovirus vectors (Ad), serotype 2 adeno-associated virus vectors (rAAV2), or self-complementary (sc) AAV2 vectors carrying green fluorescent protein (GFP). Using 6 horses, bilateral metacarpophalangeal joints were injected with Ad, rAAV2, or scAAV2 vectors carrying GFP genes to assess the in vivo joint inflammation and neutralizing antibody (NAb) titer in serum and joint fluid. In vitro, the greater transduction efficiency and sustained gene expression were achieved by scAAV2 compared to rAAV2 in equine chondrocytes and synovial cells. In vivo, AAV2 demonstrated less joint inflammation than Ad, but similar NAb titer. The scAAV2 vectors can induce superior gene transduction than rAAV2 in articular cells, and both rAAV2 and scAAV2 vectors were showed to be safer for intra-articular use than Ad vectors.

scholarly journals Self-complementarity in adeno-associated virus enhances transduction and gene expression in mouse cochlear tissues

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0242599
Author(s):  
Graham Casey ◽  
Charles Askew ◽  
Mark A. Brimble ◽  
R. Jude Samulski ◽  
Andrew M. Davidoff ◽  
...  
Keyword(s):  
Fluorescent Protein ◽  
Transduction Efficiency ◽  
Sensory Cells ◽  
Adeno Associated Virus ◽  
Large Numbers ◽  
Green Fluorescent ◽  
Interest In Research ◽  
Tyrphostin 23

Sensorineural hearing loss is one of the most common disabilities worldwide. Such prevalence necessitates effective tools for studying the molecular workings of cochlear cells. One prominent and effective vector for expressing genes of interest in research models is adeno-associated virus (AAV). However, AAV efficacy in transducing cochlear cells can vary for a number of reasons including serotype, species, and methodology, and oftentimes requires high multiplicity of infection which can damage the sensory cells. Reports in other systems suggest multiple approaches can be used to enhance AAV transduction including self-complementary vector design and pharmacological inhibition of degradation. Here we produced AAV to drive green fluorescent protein (GFP) expression in explanted neonatal mouse cochleae. Treatment with eeyarestatin I, tyrphostin 23, or lipofectamine 2000 did not result in increased transduction, however, self-complementary vector design resulted in significantly more GFP positive cells when compared to single-stranded controls. Similarly, self-complementary AAV2 vectors demonstrated enhanced transduction efficiency compared to single stranded AAV2 when injected via the posterior semicircular canal, in vivo. Self-complementary vectors for AAV1, 8, and 9 serotypes also demonstrated robust GFP transduction in cochlear cells in vivo, though these were not directly compared to single stranded vectors. These findings suggest that second-strand synthesis may be a rate limiting step in AAV transduction of cochlear tissues and that self-complementary AAV can be used to effectively target large numbers of cochlear cells in vitro and in vivo.

scholarly journals Adeno-Associated Virus Type 2-Mediated Gene Transfer: Role of Cellular T-Cell Protein Tyrosine Phosphatase in Transgene Expression in Established Cell Lines In Vitro and Transgenic Mice In Vivo

2003 ◽  
Vol 77 (4) ◽  
pp. 2741-2746 ◽  
Author(s):  
Keyun Qing ◽  
Weiming Li ◽  
Li Zhong ◽  
Mengqun Tan ◽  
Jonathan Hansen ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Dna Synthesis ◽  
Transgene Expression ◽  
Tyrosine Phosphatase ◽  
Cell Protein ◽  
Transduction Efficiency ◽  
Adeno Associated Virus

ABSTRACT The use of adeno-associated virus type 2 (AAV) vectors has gained attention as a potentially useful alternative to the more commonly used retrovirus and adenovirus vectors for human gene therapy. However, the transduction efficiency of AAV vectors varies greatly in different cells and tissues in vitro and in vivo. We have documented that a cellular protein that binds the immunosuppressant drug FK506, termed the FK506-binding protein (FKBP52), interacts with the single-stranded D sequence within the AAV inverted terminal repeats, inhibits viral second-strand DNA synthesis, and consequently limits high-efficiency transgene expression (K. Qing, J. Hansen, K. A. Weigel-Kelley, M. Tan, S. Zhou, and A. Srivastava, J. Virol., 75: 8968-8976, 2001). FKBP52 can be phosphorylated at both tyrosine and serine/threonine residues, but only the phosphorylated forms of FKBP52 interact with the D sequence. Furthermore, the tyrosine-phosphorylated FKBP52 inhibits AAV second-strand DNA synthesis by greater than 90%, and the serine/threonine-phosphorylated FKBP52 causes ∼40% inhibition, whereas the dephosphorylated FKBP52 has no effect on AAV second-strand DNA synthesis. In the present study, we have identified that the tyrosine-phosphorylated form of FKBP52 is a substrate for the cellular T-cell protein tyrosine phosphatase (TC-PTP). Deliberate overexpression of the murine wild-type (wt) TC-PTP gene, but not that of a cysteine-to-serine (C-S) mutant, caused tyrosine dephosphorylation of FKBP52, leading to efficient viral second-strand DNA synthesis and resulting in a significant increase in AAV-mediated transduction efficiency in HeLa cells in vitro. Both wt and C-S mutant TC-PTP expression cassettes were also used to generate transgenic mice. Primitive hematopoietic stem/progenitor cells from wt TC-PTP-transgenic mice, but not from C-S mutant TC-PTP-transgenic mice, could be successfully transduced by recombinant AAV vectors. These studies corroborate the fact that tyrosine phosphorylation of the cellular FKBP52 protein strongly influences AAV transduction efficiency, which may have important implications in the optimal use of AAV vectors in human gene therapy.

scholarly journals High-Throughput In Vitro, Ex Vivo, and In Vivo Screen of Adeno-Associated Virus Vectors Based on Physical and Functional Transduction

2020 ◽  
Vol 31 (9-10) ◽  
pp. 575-589 ◽  
Author(s):  
Adrian Westhaus ◽  
Marti Cabanes-Creus ◽  
Arkadiusz Rybicki ◽  
Grober Baltazar ◽  
Renina Gale Navarro ◽  
...  
Keyword(s):  
High Throughput ◽  
Ex Vivo ◽  
Adeno Associated Virus ◽  
Virus Vectors ◽  
In Vivo Screen
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