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A tetracycline expression system in combination with Sox9 for cartilage tissue engineering
1MOE Key Lab. Bioinformatics, Center for Epigentics and Chromatin, School of Life Sciences, Tsinghua University, Beijing 100084, China.
Biomaterials
|December 11, 2013
Summary
Controllable transcriptional therapy using a Tet-on system to express Sox9 effectively engineers cartilage tissue. This approach overcomes chondrocyte degradation and promotes artificial cartilage formation in vivo and in vitro.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Molecular Biology
Background:
- Cartilage tissue engineering faces challenges with chondrocyte degradation.
- Synthetic biopolymer scaffolds offer potential for cartilage repair.
- Controllable transcriptional therapy presents a novel approach for regenerative medicine.
Purpose of the Study:
- To investigate the use of a tetracycline-inducible (Tet-on) system for Sox9 expression in cartilage tissue engineering.
- To evaluate the efficacy of this system in overcoming chondrocyte degradation in vitro and in vivo.
- To assess the potential of engineered poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) scaffolds combined with Sox9 induction for artificial cartilage construction.
Main Methods:
- Utilized a Tet-on system to control Sox9 expression in chondrocytes.
- Engineered PHBHHx scaffolds seeded with Sox9-transfected chondrocytes.
- Implanted scaffolds in rats and administered doxycycline (Dox) to induce Sox9 expression.
- Measured chondrocyte degradation in vitro and analyzed newly formed cartilage tissue in vivo.
Main Results:
- Sox9 expression was successfully induced by Dox in recombinant chondrocytes.
- Chondrocyte degradation was significantly reduced in vitro with Sox9 expression.
- In vivo studies showed Dox injection positively affected chondrocytes, up-regulating Sox9 and matrix proteins.
- Engineered scaffolds promoted the formation of new articular cartilage tissue.
Conclusions:
- The combined use of Sox9 and the Tet-on system is feasible for cartilage tissue engineering.
- Controllable transcriptional therapy offers a promising strategy for overcoming chondrocyte degradation.
- This approach demonstrates potential for constructing artificial cartilages both in vitro and in vivo.
