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  • 1
    ISSN: 0942-0940
    Keywords: Peripheral nerve autografts ; Rat spinal cord ; Horseradish peroxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Autologous sciatic nerve grafts were implanted to the lower thoracic spinal cord (SC) of adult rats. The grafts were longitudinally placed on both sides of the SC midline over the dura mater and their cut ends were inserted into the dorsal white matter of the SC. Eight to 60 weeks later the grafts were exposed. In a first experimental group (A) either horseradish peroxidase (HRP) or lectin conjugated horseradish peroxidase (WGA-HRP) was injected into the grafts in order to investigate the origin and the course of regenerated fibres entering the grafts. In a second experimental group (B) the SC was acutely transected between the upper and lower graft insertions and either HRP or WGA-HRP was injected into the caudal stump of the SC in order to investigate the ability of regenerating axons once entered the grafts to re-enter the SC. In group A retrogradely labelled cells were found in the SC scattered in proximity of both the caudal and rostral graft insertions and in the ventral horns as far as 30 mm rostrally to the grafts. Labelled cells were also located in the spinal ganglia, at the level of the grafts and up to 6 segments caudal to them. In group B retrogradely labelled cells were present in the SC rostrally to the transection, both in proximity of the upper graft insertions and in the ventral horns as far as 30 mm rostrally to the grafts. These findings demonstrate that PN grafts implanted to the SC of adults rats can be innervated by regenerated axons arising from both intraspinal neurons and dorsal root ganglion cells (group A); furthermore axons from intraspinal neurons entered and elongated in the grafts can reenter the SC (group B).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1590-3478
    Keywords: Fresh isologous spinal cord ; perivenous cuffs ; demyelination ; fibrillary gliosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Differenti forme di encefalomielite allergica sperimentale sono state realizzate in quattro gruppi di cavie con iniezione di emulsioni: il primo gruppo era di 7 cavie di tipo Hartley, il secondo era formato da 12 adulti dello stesso ceppo, il terzo da 6 soggetti di ceppo giovanile 2 e il quarto da 6 animali del ceppo giovanile 13. I gruppi 1 e 2 ricevettero emulsioni contenenti rispettivamente 250 e 500 mg. di tessuto midollare isolago fresco con composto di Freund e soluzione salina mentre i grouppi 3 e 4 ricevettero un'emulsione con 120 mg. di midollo e gli altri componenti e in più 15 mg. di mycobacterium tubercolosis. Nel gruppo 1 e 2 si sviluppò una forma morbosa con ritardato avvio e un decorso prolungato e progressivo, benché 8 animali non abbiano presentato sintomi di malattia: si riscontrava nelle cavie malate la presenza di placche vaste di demielinizzazione con fibrosi perivenosa ed area estesa di infiltrazione. In 2 animali asintomatici si è constatata un'area di demielinizzazione nella sostanza bianca del midollo. La stessa forma a lento avvio e a decorso prolungato e progressivo si è verificata in 4 animali del ceppo 2. Risultò cosi che l'aumento degli antigeni ha prodotto importanti lesioni negli animali tipo Hartley anche se non tutti gli animali presentarono sintomi di malattia e lo stesso tipo di malattia è stato indotto anche in ceppi di cavie di tipo non Hartley. Queste reattività differenziate possono essere il risultato di una parziale o completa inattivazione della risposta mediata delle cellule agli antigeni inoculati.
    Notes: Abstract Different forms of experimental allergic encephalomyelitis were obtained in 4 groups of guinea pigs: 7 adult Hartley guinea pigs (Group I), 12 adults of the same strain (Group II), 6 juvenile strain 2 guinea pigs (Group III) and 6 juvenile strain 13 animals (Group IV), by the injection of emulsions. Groups I and II received emulsions containing 250 mg and 500 mg respectively of fresh isologous spinal cord tissue, complete Freund adjuvant (CFA) and saline solution while Groups III and IV received an emulsion containing 120 mg of isologous spinal cord, CFA, saline solution and 15 mg of Mycobacterium tuberculosis. The increased antigen load induced a disease with delayed onset and prolonged progressive course (C-P-EAE) in Groups I and II, although 8 animals showed no symptoms of illness. The findings in C-P-EAE were large demyelinated plaques, perivenous fibrosis and large areas of infiltration. Demyelinated areas occurred within the spinal cord white matter only in two asymptomatic animals. C-P-EAE was obtained in 4 of the Strain 2 animals. In conclusion, the increased antigen load induced a range of lesions in Hartley guinea pigs, although not all animals were affected. C-P-EAE was induced also in strains of guinea pig other than the Heartley strain. These different reactions may have been the outcome of partial or complete inactivation of the cell-mediated response to the inoculated antigens.
    Type of Medium: Electronic Resource
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