Molecular Therapy - Methods & Clinical Development

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Molecular Therapy - Methods & Clinical Development Safety and biodistribution assessment of sc-rAAV2.5IL-1Ra administered via intra- articular injection in a mono-iodoacetate-induced osteoarthritis rat model  Gensheng Wang, Christopher H Evans, Janet M Benson, Julie A Hutt, JeanClare Seagrave, Julie A Wilder, Joshua C Grieger, R Jude Samulski, Pramod S Terse  Molecular Therapy - Methods & Clinical Development  Volume 3, (January 2016) DOI: 10.1038/mtm.2015.52 Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions

Figure 1 Body weight changes in rats administered vector or vehicle. (a) Males. (b) Females. The data are presented as the group means (data were combined from all euthanasia time point subgroups). Control: vehicle control group (group 1); low: low-dose rat vector group (group 2); Mid: mid-dose rat vector group (group 3); High: high-dose rat vector group (group 4); Human: high-dose human vector group (group 5); untreated: group 6. Molecular Therapy - Methods & Clinical Development 2016 3, DOI: (10.1038/mtm.2015.52) Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions

Figure 2 Chondrocyte necrosis with depletion of proteoglycans 10 days after MIA injection (SD 7). (a and b) Control knee from a control rat; (c and d) MIA-injected knee from a control rat. (a and c) Hematoxylin and eosin stain; (b and d) Safranin O Fast Green stain. In panels c and d, the cartilage of the medial tibial plateau (between the two lines) and meniscus (asterisk) contain necrotic chondrocytes. In panel d, reduced cartilage staining by Safranin O (red) demonstrates decreased proteoglycan content. The inset in panel c is a higher magnification image showing necrotic chondrocytes (arrows) and viable chondrocytes (arrowhead). MIA, mono-iodoacetate. Molecular Therapy - Methods & Clinical Development 2016 3, DOI: (10.1038/mtm.2015.52) Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions

Figure 3 Cartilage loss with sclerosis of underlying subchondral bone 1 year after MIA injection (SD 364). (a and b) Control knee from a control rat; (c and d) MIA-injected knee from a control rat. (a and c) Hematoxylin and eosin stain; (b and d) Safranin O Fast Green stain. In the MIA-injected knee, the articular cartilage of the medial tibial plateau (between the two lines) and the medial femoral condyle is missing. The meniscus is fragmented, and the central portion of the meniscus is missing. The subchondral bone of the medial tibial plateau and femoral condyle is increased in thickness and contains islands of cartilage and fibrosis (arrows). In the control knee a and b, the asterisk marks an osteophyte that formed due to naturally occurring osteoarthritis. MIA, mono-iodoacetate. Molecular Therapy - Methods & Clinical Development 2016 3, DOI: (10.1038/mtm.2015.52) Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions

Figure 4 Vector concentrations in right knees as a function of administered dose and time. Each symbol represents vector concentration value for each animal in the indicated dose group at the indicated time point. n = 3 (n = 2 for high males at SD 180 and control males, low females, and high females at SD 364). Note that values below the quantifiable level (the LLOQ was 50 vg/µg DNA) were designated as 0 vg/µg DNA (shown as 1 µg DNA in the log scale graph). LLOQ, lower limit of quantification. Molecular Therapy - Methods & Clinical Development 2016 3, DOI: (10.1038/mtm.2015.52) Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions

Figure 5 Concentrations of human IL-1Ra protein in (a) knee-capsule extracts (b) and serum at 26 days after administration of vector containing hIL-1Ra transgene. In panel a, # indicates a sample off-scale high and arbitrarily set to the highest standard concentration (2,000 pg/ml) before correction for total protein concentration; samples below the LLOQ before correction for protein are shown as X. * indicates significantly different from the left knee of group 5 females (P < 0.05) using Kruskal–Wallis test with Dunn's post hoc analysis. Human IL-1Ra levels obtained from two naive rats are also included as baselines. In panel b, most values were below the LLOQ of 31.3 pg/ml, indicated as a dashed line. * indicates P < 0.05 versus the female control animals using the Kruskal–Wallis test with Dunn's post hoc analysis. LLOQ, lower limit of quantification. Molecular Therapy - Methods & Clinical Development 2016 3, DOI: (10.1038/mtm.2015.52) Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions

Figure 6 Anti-AAV2.5 neutralizing antibody titers in rat serum post-vector administration. The results are presented as mean ± SEM of five animals per group. Values reported as “<5” were assigned as “0” (shown as 1 in the log scale graph). Naive: group 6; control: group 1; low: group 2; mid: group 3; high: group 4; human: group 5. F, female rats; M, male rats. Molecular Therapy - Methods & Clinical Development 2016 3, DOI: (10.1038/mtm.2015.52) Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy Terms and Conditions