Lentiviral-based BMP4 in vivo gene transfer strategy increases pull-out tensile strength without an improvement in the osteointegration of the tendon graft in a rat model of biceps tenodesis.
J Gene Med
; 13(10): 511-21, 2011 Oct.
Article
em En
| MEDLINE
| ID: mdl-21898721
ABSTRACT
BACKGROUND:
The present study aimed to develop a rat model of biceps tenodesis and to assess the feasibility of a lentiviral (LV)-based bone morphogenetic protein (BMP) 4 in vivo gene transfer strategy for healing of biceps tenodesis.METHODS:
A rat model of biceps tenodesis was developed with an interference-fit open surgical technique. A LV vector expressing a BMP4 gene or ß-galactosidase (ß-gal) control gene was applied to the bone tunnel and the tendon graft before its insertion into the bone tunnel. Osteointegration was assessed by histology and pull-out tensile strength was measured by a biomechanical test suitable for small rat biceps tendon grafts.RESULTS:
Neo-chondrogenesis was seen at the tendon-bone interface of LV-BMP4-treated but not control rats. The LV-BMP4-treated rats showed 32% (p < 0.05) more newly-formed trabecular bone at the tendon-bone junction than the LV-ß-gal-treated controls after 3 weeks. However, the sites of neo-chondrogenesis and new bone formation in the LV-BMP4-treated tenodesis were highly spotty. Although the LV-BMP4 strategy did not promote bony integration of the tendon graft, it yielded a 29.5 ± 11.8% (p = 0.066) increase in improvement the pull-out strength of rat biceps tendons compared to the LV-ß-gal treatment after 5 weeks.CONCLUSIONS:
Although the LV-BMP4 in vivo gene transfer strategy did not enhance osteointegration of the tendon graft, it yielded a marked improvement in the return of the pull-out strength of the tendon graft. This presumably was largely a result of the bone formation effect of BMP4 that traps or anchors the tendon graft onto the bony tunnel.
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Base de dados:
MEDLINE
Assunto principal:
Braço
/
Tendões
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Osseointegração
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Técnicas de Transferência de Genes
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Lentivirus
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Tenodese
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Proteína Morfogenética Óssea 4
Limite:
Animals
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Humans
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Male
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article