Abstract:
:Growth and differentiation factor-5 (GDF-5) is known to induce tendon tissue and stimulate tendon healing. The hypothesis was that adenoviral GDF-5 transfer leads to transitory transgene expression and improves Achilles tendon healing. In vitro experiments were first performed with rat tenocytes. Transgene expression was evaluated by RT-PCR, Western blotting and GDF-5-ELISA. In vivo virus dosage and transgene expression were examined by a marker gene transfer (LacZ and luciferase). In the main experiment in 131 rats, adenovirus particles (3 x 10(10)) were injected into transected Achilles tendons. The time course of GDF-5 mRNA expression was assessed by real-time RT-PCR. Histology and biomechanical testing were used to evaluate tendon healing and tensile strength. In vitro GDF-5 was secreted with a maximum after 2 weeks (330 ng GDF-5/10(6) cells per 24 hr). In vivo GDF-5 transgene expression showed a maximum at 4 weeks. At 8 weeks, GDF-5 specimens were thicker (p<0.05) with a trend to higher strength (p=0,064). Histology showed greater cartilage formation in type II collagen stains than in controls. Injection of adenovirus particles successfully can deliver the GDF-5 gene in healing tendons and leads to thicker tendon regenerates after 8 weeks. This technique might become a new approach for nonsurgical treatment of tendon injuries.
journal_name
Connect Tissue Resjournal_title
Connective tissue researchauthors
Rickert M,Wang H,Wieloch P,Lorenz H,Steck E,Sabo D,Richter Wdoi
10.1080/03008200500237120keywords:
subject
Has Abstractpub_date
2005-01-01 00:00:00pages
175-83issue
4-5eissn
0300-8207issn
1607-8438pii
P0016246392153T8journal_volume
46pub_type
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journal_title:Connective tissue research
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abstract::The purpose of this investigation is to evaluate enamel thickness in extant and extinct hominoids. The material used in this study spans the evolutionary history of this group, from 20 million years ago to the present. The objectives of this investigation are to test three hypotheses: (1) the Loading Hypothesis: loadi...
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doi:
更新日期:2003-01-01 00:00:00
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journal_title:Connective tissue research
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journal_title:Connective tissue research
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更新日期:1983-01-01 00:00:00
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journal_title:Connective tissue research
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abstract::The purpose of this study was to investigate overall degradative changes occurring to enamel matrix proteins in small, freeze-dried pieces of rat incisor enamel homogenized and incubated directly for 0-48 hours in a synthetic enamel fluid solution (165 mM total ionic strength with 0.153 mM calcium chloride) versus oth...
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更新日期:1999-01-01 00:00:00
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journal_title:Connective tissue research
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更新日期:1998-01-01 00:00:00