Tissue engineering of cartilage using poly-ɛ-caprolactone nanofiber scaffolds seeded in vivo with periosteal cells  M.E. Casper, J.S. Fitzsimmons, J.J.

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Tissue engineering of cartilage using poly-ɛ-caprolactone nanofiber scaffolds seeded in vivo with periosteal cells  M.E. Casper, J.S. Fitzsimmons, J.J. Stone, A.O. Meza, Y. Huang, T.J. Ruesink, S.W. O’Driscoll, G.G. Reinholz  Osteoarthritis and Cartilage  Volume 18, Issue 7, Pages 981-991 (July 2010) DOI: 10.1016/j.joca.2010.04.009 Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Implantation (A & B) and harvesting (C & D) of PCL nanofiber scaffolds. (A) Subperiosteal implantation. (B) Closure with scaffolds under periosteum. (C) Exposure of scaffolds after 7 days of implantation. (D) Harvesting of scaffold from periosteum for in vitro culture. The black arrows indicate the location of PCL nanofiber scaffolds. The white arrow shows the periosteum after removal of PCL nanofiber scaffold. Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Safranin O/fast green stained histological specimens of uncoated (A–F) and chitosan-coated (G–L) PCL nanofiber scaffolds after 7 days of subperiosteal implantation and 6 weeks of culture. The specimens are the worst, a representative of the average, and the best based on percent cartilage in the tissue sections. The samples without chitosan are from the 7-day implantation group. For the samples with chitosan, the “Worst” is from the 7-day no TGF-β1 implantation group, which is lacking in ECM and has no cartilage staining. The “Average” is from the 7-day TGF-β1 implantation group and has little to no cartilage staining. The “Best” comes from the day 3 no TGF-β1 implantation group, stains red for cartilage on the periphery, and pink throughout the center. Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 GAG content and cartilage yield in periosteal cell-laden PCL nanofiber scaffolds. Uncoated and chitosan-coated PCL nanofiber scaffolds were implanted under the periosteum of rabbits for 1, 3, 5, or 7 days followed by 6 weeks of culture. The implant sites were injected with either 200ng TGF-β1 or vehicle. (A) GAG content in periosteal cell-laden scaffolds after 6 weeks of culture (n=7 or 8). (B) Cartilage yield in periosteal cell-laden scaffolds after 6 weeks of culture (n=16). The data presented are means with 95% CI. The asterisks indicate values that are significantly different than all other time points based on post-hoc testing (P<0.0001). Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Cartilage yield and wet weights of implant-site periosteum. Uncoated and chitosan-coated PCL nanofiber scaffolds were implanted under the periosteum of rabbits for 1, 3, 5, or 7 days followed by 6 weeks of culture. The implant sites were injected with either 200ng TGF-β1 or vehicle. (A) Cartilage yield and (B) wet weights of implant-site periosteum after 6 weeks of culture. The data presented are means with 95% CI (n=16). The brackets indicate values in the TGF-β1-injected groups that are significantly different than the corresponding vehicle controls based on post-hoc testing. Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Typical type II collagen immunohistochemical staining of uncoated (A & D) and chitosan-coated (B & E) PCL nanofiber scaffolds implanted under the periosteum of rabbits for 7 days followed by 6 weeks of culture. (C & F) Representative implant-site periosteal explant after 7 days of scaffold implantation followed by 6 weeks of culture. For reference, the uncoated scaffold (A & D), the chitosan-coated scaffold (B & E) and the periosteal explant (C & F), are from serial sections of the samples shown in Fig. 2 (B & E), Fig. 2 (H & K), and Fig. 8 (A & B), respectively. Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Mineral deposition (based on von Kossa stained histological sections) in uncoated (No Chitosan) and chitosan-coated (With Chitosan) PCL nanofiber scaffolds and periosteum from the implant sites after 7 days of implantation and 6 weeks of culture. The specimens were scored from 0 to 3 (based on a previously validated histological scoring method37) by a blinded technician where 0=no staining; 1=partial staining <50%; 2=partial staining >50%; and 3=nearly complete or complete staining of the section. The data presented are means with 95% CI (n=16). The asterisks indicate values that are significantly different than the corresponding vehicle control based on post-hoc testing (P<0.0001). Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 7 Von Kossa and safranin O/fast green stained histological sections of periosteal cell-laden PCL nanofiber scaffolds. These sections show mineralization of uncoated (A & C) and chitosan-coated (E & G) PCL nanofiber scaffolds and safranin O/fast green stained serial sections (B, D, F & H) of the periosteal cell-laden scaffolds from the 7-day subperiosteal implant group with TGF-β1 injection (A, B, E & F) and vehicle injection (C, D, G & H) at the implant site after 6 weeks of culture. Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions

Fig. 8 Von Kossa and safranin O/fast green stained histological sections. These sections show mineralization of periosteal explants from the implantation sites of uncoated (A & C) and chitosan-coated (E & G) PCL nanofiber scaffolds and safranin O/fast green stained serial sections (B, D, F & H) of periosteal explants from the 7-day subperiosteal implant group with TGF-β1 injection (A, B, E & F) and vehicle injection (C, D, G & H) at the implant site after 6 weeks of culture. The asterisks indicate values that are significantly different than the corresponding vehicle control based on post-hoc testing (P<0.0001). Osteoarthritis and Cartilage 2010 18, 981-991DOI: (10.1016/j.joca.2010.04.009) Copyright © 2010 Osteoarthritis Research Society International Terms and Conditions