Silk fibroin is a potent alternative to other biodegradable biopolymer for bone tissue engineering (TE),
because of its tunable architecture and mechanical properties, and its demonstrated ability to support
bone formation both in vitro and in vivo. In this study, we investigated a range of silk scaffolds for bone
TE using human adipose-derived stem cells (hASCs), an attractive cell source for engineering autologous
bone grafts. Our goal was to understand the effects of scaffold architecture and biomechanics and use this
information to optimize silk scaffolds for bone TE applications. Silk scaffolds were fabricated using different
solvents (aqueous vs. hexafluoro-2-propanol (HFIP)), pore sizes (250–500 lm vs. 500–1000 lm) and
structures (lamellar vs. spherical pores). Four types of silk scaffolds combining the properties of interest
were systematically compared with respect to bone tissue outcomes, with decellularized trabecular bone
(DCB) included as a ‘‘gold standard’’. The scaffolds were seeded with hASCs and cultured for 7 weeks in
osteogenic medium. Bone formation was evaluated by cell proliferation and differentiation, matrix production,
calcification and mechanical properties. We observed that 400–600 lm porous HFIP-derived silk
fibroin scaffold demonstrated the best bone tissue formation outcomes, as evidenced by increased bone
protein production (osteopontin, collagen type I, bone sialoprotein), enhanced calcium deposition and
total bone volume. On a direct comparison basis, alkaline phosphatase activity (AP) at week 2 and new
calcium deposition at week 7 were comparable to the cells cultured in DCB. Yet, among the aqueousbased
structures, the lamellar architecture induced increased AP activity and demonstrated higher equilibrium
modulus than the spherical-pore scaffolds. Based on the collected data, we propose a conceptual
model describing the effects of silk scaffold design on bone tissue formation.
ไฟโบรอินไหม คือมีแบบย่อยสลายทางเลือกอื่นสำหรับวิศวกรรมเนื้อเยื่อกระดูก ( TE ) ,
เพราะสถาปัตยกรรมพริ้ง และสมบัติเชิงกล และแสดงให้เห็นถึงความสามารถในการรองรับการ
กระดูกทั้งในหลอดทดลองและในสัตว์ทดลอง . การศึกษาช่วงของผ้าไหมนั่งร้านสำหรับเทกระดูก
ใช้มนุษย์ไขมันได้มาสเต็มเซลล์ ( hascs )เป็นแหล่งเซลล์มีเสน่ห์สำหรับวิศวกรรมของ
grafts กระดูก . เป้าหมายของเราคือเพื่อให้เข้าใจผลกระทบของสถาปัตยกรรมและชีวกลศาสตร์นั่งร้าน และใช้ข้อมูลนี้เพื่อเพิ่มประสิทธิภาพในการใช้งานนั่งร้าน
ไหมไปยังกระดูก ผ้าไหมประดิษฐ์โดยใช้ตัวทำละลายที่แตกต่างกันมีนั่งร้าน
( น้ำ กับ hexafluoro-2-propanol ( hfip ) รูขุมขนขนาด ( 250 – 500 กับ 500 – 1000 Lm LM )
( ปรับปรุงโครงสร้างกับ spherical pores). Four types of silk scaffolds combining the properties of interest
were systematically compared with respect to bone tissue outcomes, with decellularized trabecular bone
(DCB) included as a ‘‘gold standard’’. The scaffolds were seeded with hASCs and cultured for 7 weeks in
osteogenic medium. Bone formation was evaluated by cell proliferation and differentiation, matrix production,
calcification and mechanical properties. We observed that 400–600 lm porous HFIP-derived silk
fibroin scaffold demonstrated the best bone tissue formation outcomes, as evidenced by increased bone
protein production (osteopontin, collagen type I, bone sialoprotein), enhanced calcium deposition and
total bone volume. On a direct comparison basis, alkaline phosphatase activity (AP) at week 2 and new
calcium deposition at week 7 were comparable to the cells cultured in DCB. Yet, among the aqueousbased
structures, the lamellar architecture induced increased AP activity and demonstrated higher equilibrium
modulus than the spherical-pore scaffolds. Based on the collected data, we propose a conceptual
model describing the effects of silk scaffold design on bone tissue formation.
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