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- Arino, Hiroshi, et al.
(författare)
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Implantation of Schwann cells in rat tendon autografts as a model for peripheral nerve repair: Long term effects on functional recovery
- 2008
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Ingår i: Scandinavian Journal of Plastic and Reconstructive Surgery and Hand Surgery. - : Informa UK Limited. - 1651-2073 .- 0284-4311. ; 42:6, s. 281-285
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Tidskriftsartikel (refereegranskat)abstract
- Cultured Schwann cells in tendon autografts for nerve repair improve the early phase of nerve regeneration in rat sciatic nerves as judged by the rate of axonal outgrowth. We tested the long-term effects on functional recovery using measurements of muscle force, the number of axons and myelination, using morphometry. In addition, we recorded wet weight of the gastrocnemius muscle. Schwann cell cultures were prepared from predegenerated nerves. Ten and 15mm defects in rat sciatic nerves were bridged using bilateral tendon autografts with Schwann cell-seeded tendon autografts on one side, and untreated tendon autografts on the other. Animals were evaluated at six and 12 weeks, respectively. At six weeks, myelination, as judged by G-ratio (ratio of axonal diameter to diameter of nerve fibres), was significantly increased in tendon autografts pretreated with Schwann cells in 10mm defects. No such difference was seen in the 15 mmdefects. We found no difference in functional recovery, other morphometric variables, or muscle weight between the two grafts. We conclude that early effects on nerve regeneration using transplantation of cultured Schwann cells in rat sciatic nerves are temporary. Other strategies are necessary to obtain lasting effects on functional recovery.
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| 3. |
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| 4. |
- Dahlin, Lars, et al.
(författare)
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Basic science of peripheral nerve repair: Wallerian degeneration/growth cone
- 2004
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Ingår i: Operative Techniques in Orthopaedics. - : Elsevier BV. - 1048-6666. ; 14:2, s. 138-145
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Tidskriftsartikel (refereegranskat)abstract
- Trauma to a peripheral nerve trunk is a complex injury because it involves not only repair processes locally at the peripheral level, but it also engages repair and compensation mechanisms at central levels. The main actor is the fascinating and unique neuron with its supporting cells, which consist mainly of Schwann cells. In the neuron and in the Schwann cells, intracellular signaling mechanisms are initiated by the peripheral nerve injury and aim to turn the intracellular processes into a regenerative and proliferative state. The intracellular signaling mechanism is called signal transduction and works along the entire neuron, including the intracellular axonal transport system. A very delicate interaction occurs between the growth cones formed by the distal tip of the outgrowing axons and the environment into which the axons grow. A large number of changes occur in this environment due to the process of Wallerian degeneration caused by the injury. A thorough knowledge of the cellular and molecular repair mechanisms after peripheral nerve injury is the basis on which we can build new research with the aim to improve results after this devastating injury, because there are limitations in the pure surgical treatment of peripheral injury.
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| 5. |
- Dahlin, Lars, et al.
(författare)
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Schwann cells, acutely dissociated from a predegenerated nerve trunk, can be applied into a matrix used to bridge nerve defects in rats
- 2007
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Ingår i: Acta Neurochirurgica. Supplementum. - 0065-1419. ; 100, s. 57-60
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: The gold standard to reconstruct a nerve defect is a conventional autologous nerve graft. There may be a lack of such grafts in severe nerve injuries. Alternatives to autologous nerve grafts are needed. METHODS: We have developed a technique where mainly Schwann cells are acutely dissociated from the ends of the severed nerve trunk after nerve injury. The technique does not require long-term cell culture procedures. The obtained cells, which can be dissociated within a few hours, are applied to a silicone tube or a tendon autograft used to bridge a nerve defect. FINDINGS: Dissociated cells from the ends of the severed nerve ends consist of more than 85% of Schwann cells. The remaining cells are ED1 stained macrophages. The cells survive transfer to a silicone tube or a tendon autograft which bridge the nerve defect. Axons do grow through such a graft filled with dissociated cells. CONCLUSION: Our novel model to obtain mainly Schwann cells by dissociation of the cells from the severed nerve ends after injury and add them to a matrix, thereby creating an artificial nerve graft, may be a new technique with potential clinical application in nerve reconstruction.
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| 6. |
- Nishiura, Y, et al.
(författare)
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Addition of cultured Schwann cells to tendon autografts and freeze-thawed muscle grafts improves peripheral nerve regeneration
- 2004
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Ingår i: Tissue Engineering. - 1076-3279. ; 10:1-2, s. 157-164
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Tidskriftsartikel (refereegranskat)abstract
- The effects of addition of Schwann cells on peripheral nerve regeneration through a novel graft material-the tendon autograft-and a conventional freeze-thawed muscle graft, were studied in the rat sciatic nerve. Adult Schwann cell cultures were established from predegenerated nerves. The Schwann cells were added to the autologous grafts by coculture (tendon autograft) or injection (freeze-thawed muscle graft). Both graft types supported adherence of the added Schwann cells. Addition of cultured Schwann cells to the two different graft models improved regeneration by increasing the rate of axonal outgrowth as compared with similar grafts without added cells.
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