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EFFICIENT AND SELECTIVE GENE TRANSFER DIRECTED TO MUSCLE BY TROPISM-MODIFIED ADENO-ASSOCIATED VIRUS VECTOR

Yu, Chi-Yi (2007) EFFICIENT AND SELECTIVE GENE TRANSFER DIRECTED TO MUSCLE BY TROPISM-MODIFIED ADENO-ASSOCIATED VIRUS VECTOR. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Gene therapy offers a promise for treating inherited muscle disorders. The advantages of recombinant adeno-associated virus (rAAV) gene delivery vector include nonpathogenicity and long-term gene expression after a single administered dose. However, rAAV predominantly transduces the liver after systemic administration, reducing its efficiency for gene transfer to the heart and skeletal muscle. The question of how to deliver the therapeutic genes into most of the diseased myofibers becomes a challenge. The goal of this project is to develop an efficient and muscle-specific AAV vector for systemic delivery. Here, the muscle-targeting peptide ASSLNIA was incorporated into AAV2 capsid after residue 587 without heparin-binding motif (587 TG MTP vector) or with heparin-binding motif (588 HB MTP vector) since heparan sulfate is the primary cellular receptor of AAV2. The efficiencies and selectivities of muscle targeting of modified rAAVs were evaluated in vitro and in vivo. This study demonstrated that the peptide-modified vectors maintained their myotube transduction ability. Peptide-engineered AAVs decreased their transductions in non-muscle cell lines. In addition, the 587 TG MTP vector did not require the heparin-dependent mechanism for muscular targeting. The C2C12 myotube transductions of 587 TG MTP and 588 HB MTP vectors were inhibited 47%~58% in the presence of free ASSLNIA peptide while unmodified rAAV2 transduction was only suppressed by 25%. To explore the muscle-targeting abilities of modified rAAVs in vivo, mice were injected intravenously via a tail vein with a viral dose containing 9x10^11 genomic particles. After four weeks, mouse organs were harvested for the luciferase assay. The 587 TG MTP vector demonstrated enhanced muscle and heart transduction compared to unmodified rAAV2. Importantly, the 587 TG MTP virus significantly reduced its transduction of liver, lungs, and spleen. The vector biodistribution in organs was also determined by real-time PCR and peptide-modified vectors showed similar targeting effects. Moreover, this study found that both 587 TG MTP and 588 HB MTP vectors were resistant to antibody neutralization. These results indicate that this muscle-targeting peptide facilitates the generation of an efficient and muscle-specific AAV vector for systemic gene delivery in the treatment of muscle diseases to provide clinical and public health benefits.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Yu, Chi-Yitammyyo@yahoo.com
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairXiao, Xiaoxxiao@email.unc.edu
Committee CoChairGupta, Phalgunipgupta1@pitt.eduPGUPTA1
Committee MemberJenkins, Frank Jfjenkins@pitt.eduFJENKINS
Committee MemberClemens, Paula Rpclemens@pitt.eduPCLEMENS
Committee MemberBarratt-Boyes, Simon Msmbb@pitt.eduSMBB
Date: 22 June 2007
Date Type: Completion
Defense Date: 25 January 2007
Approval Date: 22 June 2007
Submission Date: 11 April 2007
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Institution: University of Pittsburgh
Schools and Programs: Graduate School of Public Health > Infectious Diseases and Microbiology
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: capsid modification; muscle; targeting; adeno-associated virus; systemic delivery
Other ID: http://etd.library.pitt.edu/ETD/available/etd-04112007-143609/, etd-04112007-143609
Date Deposited: 10 Nov 2011 19:35
Last Modified: 15 Nov 2016 13:39
URI: http://d-scholarship.pitt.edu/id/eprint/7003

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