The intermingling of regenerated nerve fibers inside nerve grafts is the main reason for mismatched nerve fibers. This is one of the key factors affecting limb function recovery after nerve injury. Previous research h...The intermingling of regenerated nerve fibers inside nerve grafts is the main reason for mismatched nerve fibers. This is one of the key factors affecting limb function recovery after nerve injury. Previous research has shown that the accuracy of axon regeneration can be improved by a bionic structural implant. To this aim, iodine and freeze-drying high-resolution micro-computed tomography was performed to visualize the 3D topography of the New Zealand rabbit sciatic nerve (25 mm). A series of 1-, 2-, 3-, and 4-custom anatomy-based nerve conduits (CANCs) were fabricated based on the anatomical structure of the nerve fascicle. The match index, luminal surface, and mechanical properties of CANCs were evaluated before implanting in a 10-mm gap of the sciatic nerve. Recovery was evaluated by histomorphometric analyses, electrophysiological study, gastrocnemius muscle weight recovery ratio, and behavioral assessments at 12 and 24 weeks postoperatively. The accuracy of nerve regeneration was determined by changes in fluorescence-labeled profile number during simultaneous retrograde tracing. Our results showed that the optimal preprocessing condition for high-resolution micro-computed tomography visualization was treatment of the sciatic nerve with 40% Lugol’s solution for 3 days followed by lyophilization for 2 days. In vitro experiments demonstrated that the match index was highest in the 3-CANC group, followed by the 2-, 1-, and 4-CANC groups. The luminal surface was lowest in the 1-CANC group. Mechanical properties (transverse compressive and bending properties) were higher in the 3- and 4-CANC groups than in the 1-CANC group. In vivo experiments demonstrated that the recovery (morphology of regenerated fibers, compound muscle action potential, gastrocnemius muscle weight recovery ratio, pain-related autotomy behaviors, and range of motion) in the 3-CANC group was superior to the other CANC groups, and achieved the same therapeutic effect as the autograft. The simultaneous retrograde tracing results showed that the percentages of double-labeled profiles of the 2-, 3-, and 4-CANC groups were comparatively lower than that of the 1-CANC group, which indicates that regenerated nerve fascicles were less intermingled in the 2-, 3-, and 4-CANC groups. These findings demonstrate that the visualization of the rabbit sciatic nerve can be achieved by iodine and freeze-drying high-resolution micro-computed tomography, and that this method can be used to design CANCs with different channels that are based on the anatomical structure of the nerve. Compared with the 1-CANC, 3-CANC had a higher match index and luminal surface, and improved the accuracy of nerve regeneration by limiting the intermingling of the regenerated fascicles. All procedures were approved by the Animal Care and Use Committee, Xinjiang Medical University, China on April 4, 2017 (ethics approval No. IACUC20170315-02).展开更多
Objective:To study the effects of silent information regulator of transcription 2 (SIRT2) on inflammatory response and bone destruction in cartilage tissue of osteoarthritis.Methods: A total of 200 patients who underw...Objective:To study the effects of silent information regulator of transcription 2 (SIRT2) on inflammatory response and bone destruction in cartilage tissue of osteoarthritis.Methods: A total of 200 patients who underwent knee replacement due to knee osteoarthritis in Kashgar Prefecture First People's Hospital between September 2014 and September 2017 were selected as the osteoarthritis (OA) group of the research, and 80 patients who underwent knee replacement or meniscus operation due to trauma in Kashgar Prefecture First People's Hospital during the same period were selected as the control group. Articular cartilage tissue was collected after surgery to measure the expression of SIRT2 and bone destruction-related apoptosis molecules as well as the levels of inflammatory response molecules and bone destruction-related collagen metabolism molecules.Results: SIRT2 and Bcl-2 mRNA expression as well as SOX9 and Col-II levels in articular cartilage tissue of OA group were significantly lower than those of control group whereas TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression were significantly higher than those of control group;SIRT2 mRNA expression in articular cartilage tissue of OA group was positively correlated with Bcl-2 mRNA expression as well as SOX9 and Col-II levels, and negatively correlated with TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression.Conclusion: The lowly expressed SIRT2 in cartilage of osteoarthritis can aggravate inflammatory response and bone destruction.展开更多
基金supported by the National Natural Science Foundation of China,No.81360270,81560357(both to AY),and 31670986(to QTZ)the Key Laboratory of Hand Reconstruction,Ministry of Health,China+1 种基金the Shanghai Key Laboratory of Peripheral Nerve and Microsurgery of China,No.17DZ2270500(to AY)the Science and Technology Project of Guangdong Province of China,No.2014B020227001,2017A050501017(both to QTZ)
文摘The intermingling of regenerated nerve fibers inside nerve grafts is the main reason for mismatched nerve fibers. This is one of the key factors affecting limb function recovery after nerve injury. Previous research has shown that the accuracy of axon regeneration can be improved by a bionic structural implant. To this aim, iodine and freeze-drying high-resolution micro-computed tomography was performed to visualize the 3D topography of the New Zealand rabbit sciatic nerve (25 mm). A series of 1-, 2-, 3-, and 4-custom anatomy-based nerve conduits (CANCs) were fabricated based on the anatomical structure of the nerve fascicle. The match index, luminal surface, and mechanical properties of CANCs were evaluated before implanting in a 10-mm gap of the sciatic nerve. Recovery was evaluated by histomorphometric analyses, electrophysiological study, gastrocnemius muscle weight recovery ratio, and behavioral assessments at 12 and 24 weeks postoperatively. The accuracy of nerve regeneration was determined by changes in fluorescence-labeled profile number during simultaneous retrograde tracing. Our results showed that the optimal preprocessing condition for high-resolution micro-computed tomography visualization was treatment of the sciatic nerve with 40% Lugol’s solution for 3 days followed by lyophilization for 2 days. In vitro experiments demonstrated that the match index was highest in the 3-CANC group, followed by the 2-, 1-, and 4-CANC groups. The luminal surface was lowest in the 1-CANC group. Mechanical properties (transverse compressive and bending properties) were higher in the 3- and 4-CANC groups than in the 1-CANC group. In vivo experiments demonstrated that the recovery (morphology of regenerated fibers, compound muscle action potential, gastrocnemius muscle weight recovery ratio, pain-related autotomy behaviors, and range of motion) in the 3-CANC group was superior to the other CANC groups, and achieved the same therapeutic effect as the autograft. The simultaneous retrograde tracing results showed that the percentages of double-labeled profiles of the 2-, 3-, and 4-CANC groups were comparatively lower than that of the 1-CANC group, which indicates that regenerated nerve fascicles were less intermingled in the 2-, 3-, and 4-CANC groups. These findings demonstrate that the visualization of the rabbit sciatic nerve can be achieved by iodine and freeze-drying high-resolution micro-computed tomography, and that this method can be used to design CANCs with different channels that are based on the anatomical structure of the nerve. Compared with the 1-CANC, 3-CANC had a higher match index and luminal surface, and improved the accuracy of nerve regeneration by limiting the intermingling of the regenerated fascicles. All procedures were approved by the Animal Care and Use Committee, Xinjiang Medical University, China on April 4, 2017 (ethics approval No. IACUC20170315-02).
文摘Objective:To study the effects of silent information regulator of transcription 2 (SIRT2) on inflammatory response and bone destruction in cartilage tissue of osteoarthritis.Methods: A total of 200 patients who underwent knee replacement due to knee osteoarthritis in Kashgar Prefecture First People's Hospital between September 2014 and September 2017 were selected as the osteoarthritis (OA) group of the research, and 80 patients who underwent knee replacement or meniscus operation due to trauma in Kashgar Prefecture First People's Hospital during the same period were selected as the control group. Articular cartilage tissue was collected after surgery to measure the expression of SIRT2 and bone destruction-related apoptosis molecules as well as the levels of inflammatory response molecules and bone destruction-related collagen metabolism molecules.Results: SIRT2 and Bcl-2 mRNA expression as well as SOX9 and Col-II levels in articular cartilage tissue of OA group were significantly lower than those of control group whereas TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression were significantly higher than those of control group;SIRT2 mRNA expression in articular cartilage tissue of OA group was positively correlated with Bcl-2 mRNA expression as well as SOX9 and Col-II levels, and negatively correlated with TNF-α, bFGF, NO, IP-10, CCL2, PAR-2,β-catenin, OPN and MMP13 levels as well as Fas, GRP78, ATF6 and Caspase-3 mRNA expression.Conclusion: The lowly expressed SIRT2 in cartilage of osteoarthritis can aggravate inflammatory response and bone destruction.
