Mechanical overload decreases the thermal stability of collagen in an in vitro tensile overload tendon model
Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular‐level changes in collagen caused by tensile overload of bovine tail tendons in vitro. Previous investigators concluded that tensile tendon rupture resulted in collagen denaturation, but our study s...
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Published in | Journal of orthopaedic research Vol. 26; no. 12; pp. 1605 - 1610 |
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Language | English |
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01.12.2008
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Abstract | Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular‐level changes in collagen caused by tensile overload of bovine tail tendons in vitro. Previous investigators concluded that tensile tendon rupture resulted in collagen denaturation, but our study suggests otherwise. Based on contemporary collagen biophysics, we hypothesized that tensile overload would lead to reduced thermal stability without change in the nativity of the molecular conformation. The thermal behavior of collagen from tail tendons ruptured in vitro at two strain rates (0.01 s−1 and 10 s−1) was measured by differential scanning calorimetry (DSC). The 1,000‐fold difference in strain rate was used since molecular mechanisms that determine mechanical behavior are thought to be strain rate‐dependent. DSC revealed that the collagen in tensile overloaded tendons was less thermally stable by 3° to 5°C relative to undamaged controls and was not denatured since there was no change in enthalpy of denaturation. The decrease in thermal stability occurred throughout the overloaded regions, independent of rupture site, and was greater in specimens ruptured at the lower strain rate. The deformation mechanism apparently involves disruption of the lattice structure of the collagen fibrils and greatly increases the molecular freedom of the collagen molecules, leading to reduced thermal molecular stability and the previously reported increased proteolysis. This has important implications for understanding soft tissue injuries, disease etiology and treatment, and for developing tissue engineered products with improved durability. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res |
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AbstractList | Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular‐level changes in collagen caused by tensile overload of bovine tail tendons in vitro. Previous investigators concluded that tensile tendon rupture resulted in collagen denaturation, but our study suggests otherwise. Based on contemporary collagen biophysics, we hypothesized that tensile overload would lead to reduced thermal stability without change in the nativity of the molecular conformation. The thermal behavior of collagen from tail tendons ruptured in vitro at two strain rates (0.01 s−1 and 10 s−1) was measured by differential scanning calorimetry (DSC). The 1,000‐fold difference in strain rate was used since molecular mechanisms that determine mechanical behavior are thought to be strain rate‐dependent. DSC revealed that the collagen in tensile overloaded tendons was less thermally stable by 3° to 5°C relative to undamaged controls and was not denatured since there was no change in enthalpy of denaturation. The decrease in thermal stability occurred throughout the overloaded regions, independent of rupture site, and was greater in specimens ruptured at the lower strain rate. The deformation mechanism apparently involves disruption of the lattice structure of the collagen fibrils and greatly increases the molecular freedom of the collagen molecules, leading to reduced thermal molecular stability and the previously reported increased proteolysis. This has important implications for understanding soft tissue injuries, disease etiology and treatment, and for developing tissue engineered products with improved durability. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular‐level changes in collagen caused by tensile overload of bovine tail tendons in vitro. Previous investigators concluded that tensile tendon rupture resulted in collagen denaturation, but our study suggests otherwise. Based on contemporary collagen biophysics, we hypothesized that tensile overload would lead to reduced thermal stability without change in the nativity of the molecular conformation. The thermal behavior of collagen from tail tendons ruptured in vitro at two strain rates (0.01 s −1 and 10 s −1 ) was measured by differential scanning calorimetry (DSC). The 1,000‐fold difference in strain rate was used since molecular mechanisms that determine mechanical behavior are thought to be strain rate‐dependent. DSC revealed that the collagen in tensile overloaded tendons was less thermally stable by 3° to 5°C relative to undamaged controls and was not denatured since there was no change in enthalpy of denaturation. The decrease in thermal stability occurred throughout the overloaded regions, independent of rupture site, and was greater in specimens ruptured at the lower strain rate. The deformation mechanism apparently involves disruption of the lattice structure of the collagen fibrils and greatly increases the molecular freedom of the collagen molecules, leading to reduced thermal molecular stability and the previously reported increased proteolysis. This has important implications for understanding soft tissue injuries, disease etiology and treatment, and for developing tissue engineered products with improved durability. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular-level changes in collagen caused by tensile overload of bovine tail tendons in vitro. Previous investigators concluded that tensile tendon rupture resulted in collagen denaturation, but our study suggests otherwise. Based on contemporary collagen biophysics, we hypothesized that tensile overload would lead to reduced thermal stability without change in the nativity of the molecular conformation. The thermal behavior of collagen from tail tendons ruptured in vitro at two strain rates (0.01 s(-1) and 10 s(-1)) was measured by differential scanning calorimetry (DSC). The 1,000-fold difference in strain rate was used since molecular mechanisms that determine mechanical behavior are thought to be strain rate-dependent. DSC revealed that the collagen in tensile overloaded tendons was less thermally stable by 3 degrees to 5 degrees C relative to undamaged controls and was not denatured since there was no change in enthalpy of denaturation. The decrease in thermal stability occurred throughout the overloaded regions, independent of rupture site, and was greater in specimens ruptured at the lower strain rate. The deformation mechanism apparently involves disruption of the lattice structure of the collagen fibrils and greatly increases the molecular freedom of the collagen molecules, leading to reduced thermal molecular stability and the previously reported increased proteolysis. This has important implications for understanding soft tissue injuries, disease etiology and treatment, and for developing tissue engineered products with improved durability. |
Author | Willett, Thomas L. Lee, J. Michael Labow, Rosalind S. |
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Snippet | Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular‐level changes in collagen caused by tensile overload of... Musculoskeletal soft tissue injuries are very common, yet poorly understood. We investigated molecular-level changes in collagen caused by tensile overload of... |
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SubjectTerms | Animals Biomechanical Phenomena Cattle collagen Collagen - analysis Collagen - chemistry damage denaturation Hot Temperature injury Male Models, Animal Models, Chemical Models, Structural Protein Conformation Protein Denaturation Protein Stability stability Tendons - chemistry Tensile Strength |
Title | Mechanical overload decreases the thermal stability of collagen in an in vitro tensile overload tendon model |
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