Title |
Modulation of tendon healing by nitric oxide
|
---|---|
Published in |
Inflammation Research, January 1997
|
DOI | 10.1007/s000110050027 |
Pubmed ID | |
Authors |
G. A. C. Murrell, C. Szabo, J. A. Hannafin, D. Jang, M. M. Dolan, X.-H. Deng, D. F. Murrell, R. F. Warren |
Abstract |
Nitric oxide (NO) is a small, diffusible free radical that is generated from L-arginine by a family of enzymes, collectively termed the nitric oxide synthases. We investigated the role of NO in tendon healing. NO synthase activity and immunoreactivity was absent in un-injured rat Achilles tendon. After surgical division there was a five-fold increase in NO synthase activity and immunoreactivity within the healing tendon at day 7, with a return to near baseline levels at day 14. Inhibition of NO synthase activity with oral administration of N omega-nitro-L-arginine methyl ester (L-NAME) resulted in a significant reduction in cross-sectional area (30% at day 7, p < 0.01, 50% at day 15, p < 0.001) and failure load (24% at day 7, p < 0.01) of the healing Achilles tendon constructs. Rats fed the same regimen of the enantiomer of L-NAME, (D-NAME) had normal tendon healing. These results indicate that nitric oxide synthase is induced during tendon healing and inhibition of nitric oxide synthase inhibits this tendon healing. |
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