Arthritic diseases are chronic, crippling conditions for which there are no cures. We, and others, have shown that direct intra-articular injection of certain recombinant viral vectors can provide expression of therapeutic transgenes at levels sufficient to halt arthritis in animal models. Further, we have recently demonstrated that with the use of immunologically compatible vectors and cDNAs, exogenous transgenes can be expressed indefinitely in the joints of experimental animals. A primary barrier to clinical translation of gene therapies for chronic joint disease has been the lack of suitable vector systems. In this regard, recombinant adeno- associated virus (AAV) offers many advantages: it is nonpathogenic, of low immunogenicity, and enables persistent transgene expression in many applications. The capacity to cross-package, or pseudotype, the AAV2 vector has significantly expanded the versatility of this system, providing the opportunity to enhance transgenic expression as well as the potential to evade pre-existing immunity. Currently 9 AAV capsid serotypes are being developed as vectors for gene therapy applications. The recent development of double- stranded, self-complementary (sc) AAV vectors overcomes previous limitations associated with inefficient second strand DNA synthesis in articular tissues such that AAV vectors can be realistically considered for human application. Beyond the capacity of AAV vectors to deliver exogenous genes to joint tissue and achieve short-term functional expression, very little is known specifically of the biology of this system in the context of the articular environment. Thus, the goal of this project is to develop an understanding of the pharmacokinetics of AAV vector serotypes 1-9 intra-articularly to facilitate the clinical application of this technology in a safe, rational and effective manner.
In Specific Aim 1, using a nude rat model to avoid issues of immune interference, we will establish local and systemic transgene delivery and expression profiles for AAV serotypes 1-9 following intra-articular administration.
In Aim 2 we will perform similar experiments in an arthritic model to determine how morphologic changes associated with inflammatory disease affect AAV-mediated gene delivery and expression.
For Aim 3, using immunologically competent animals we will determine the capacity to enhance or rescue AAV-mediated transgene expression by repeat vector administration and the use of alternate vector serotypes.
In Aim 4 we will determine the impact of prior natural infection with wild type AAV2 on transgene delivery and expression of recombinant AAV vectors of the same and alternate serotypes.
Arthritic diseases are chronic, crippling conditions for which there are no cures. A primary barrier to clinical translation of gene therapies for chronic joint disease has been the lack of suitable vector systems. The goal of this project is to develop an understanding of the pharmacokinetics of the AAV vector serotypes intra-articularly to facilitate the clinical application of this technology in a safe, rational and effective manner.
|Smith, Andrew D; Morton, Alison J; Winter, Matthew D et al. (2016) MAGNETIC RESONANCE IMAGING SCORING OF AN EXPERIMENTAL MODEL OF POST-TRAUMATIC OSTEOARTHRITIS IN THE EQUINE CARPUS. Vet Radiol Ultrasound 57:502-14|
|Evans, Christopher H; Huard, Johnny (2015) Gene therapy approaches to regenerating the musculoskeletal system. Nat Rev Rheumatol 11:234-42|
|Evans, Christopher H; Ghivizzani, Steven C; Robbins, Paul D (2013) Arthritis gene therapy and its tortuous path into the clinic. Transl Res 161:205-16|
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|Evans, C H; Ghivizzani, S C; Robbins, P D (2012) Orthopedic gene therapy--lost in translation? J Cell Physiol 227:416-20|
|Evans, Christopher H; Ghivizzani, Steven C; Robbins, Paul D (2011) Getting arthritis gene therapy into the clinic. Nat Rev Rheumatol 7:244-9|
|Watson, Rachael S; Gouze, Elvire; Levings, Padraic P et al. (2010) Gene delivery of TGF-Ã½Ã½1 induces arthrofibrosis and chondrometaplasia of synovium in vivo. Lab Invest 90:1615-27|
|Steinert, Andre F; Palmer, Glyn D; Pilapil, Carmencita et al. (2009) Enhanced in vitro chondrogenesis of primary mesenchymal stem cells by combined gene transfer. Tissue Eng Part A 15:1127-39|
|Evans, Christopher H; Ghivizzani, Steven C; Robbins, Paul D (2009) Gene therapy of the rheumatic diseases: 1998 to 2008. Arthritis Res Ther 11:209|
|Steinert, Andre F; Proffen, Benedikt; Kunz, Manuela et al. (2009) Hypertrophy is induced during the in vitro chondrogenic differentiation of human mesenchymal stem cells by bone morphogenetic protein-2 and bone morphogenetic protein-4 gene transfer. Arthritis Res Ther 11:R148|
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