Regeneração axonal durante administração sistemica de tiamina, piridoxina e cianocobalamina
Osvaldo Benedito Rodrigues
DISSERTAÇÃO
Português
(Broch.)
T/UNICAMP R618r
Piracicaba, SP : [s.n.], 2003.
91f. : il.
Orientador : Heloisa Amelia de Lima Castro
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Resumo: As vitaminas do complexo B são importantes tanto no metabolismo do sistema nervoso central como periférico. Sua deficiência pode causar degeneração do axônio ou da bainha de mielina das fibras nervosas; sendo porém revertido o quadro quando da sua administração. Varias patologias do sistema...
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Resumo: As vitaminas do complexo B são importantes tanto no metabolismo do sistema nervoso central como periférico. Sua deficiência pode causar degeneração do axônio ou da bainha de mielina das fibras nervosas; sendo porém revertido o quadro quando da sua administração. Varias patologias do sistema nervoso periférico causam lesão da bainha de mielina, ou do axônio ou de ambos. Assim o uso de vitaminas está indicado como medida de tratamento, porém há controvérsia a respeito. O objetivo deste trabalho foi estudar a influência da tiamina, piridoxina e cianocobalamina durante a regeneração axonal. Ratos adultos foram divididos em três grupos: I II III Nos animais dos grupos I e II foi injetado álcool etílico a 95% no nervo isquiático esquerdo, levando a degeneração da bainha de mielina e do axônio das fibras nervosas. Os animais do grupo I receberam via oral tiamina, piridoxina e cianocobalamina diariamente, os do grupo II não receberam-nas e os animais do grupo fi foram usados para análise morfoquantitativa do nervo isquiático normal. Após 60 dias da infiltração com álcool etílico a 95%, o nervo isquiático esquerdo de todos os animais foi removido, processado para microscopia de luz e eletrônica, submetido à análise quantitativa e qualitativa. Os resultados mostraramnão haver diferenças histológicas entre os grupos I e II. A análise do número médio de axônios mielínicos e da área média da secção transversa mostraram não haver diferença significativa entre os três grupos. Não foram observados sinais de intoxicação vitamínica com a dosagem utilizada
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Abstract: The vitamin B complex are important in the metabolism of the central and peripheral nervous system. Its deficiency can lead to the disintegration of the myelin sheath and to the to axonal damage, and can be relieved by appropriated therapeutic measures. Several diseases of the peripheral...
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Abstract: The vitamin B complex are important in the metabolism of the central and peripheral nervous system. Its deficiency can lead to the disintegration of the myelin sheath and to the to axonal damage, and can be relieved by appropriated therapeutic measures. Several diseases of the peripheral nervous system may lead damage in the myelin sheath or in the
axon or both. This fact has lead to the recommendation that vitamins B complex can be administrated as a therapeutic method, but there is controversy about this. The aim of this work was to study the influency of the thiamine, pyridoxine and cobalamine in the course of axonal regeneration. Fully-grown rats were divided in three groups: I II III. In the animals of the
groups I and II were injected ethylic alcohol in concentrationof 95% in de left ciatic nerve, what promoted degeneration of the myelin sheat and the axon of the nerve fibers. The animals of the group I daily received thiamine, pyridoxine and cobalamine by oral way, that of the group II do not received the vitamins and that of the group III were used to provide histological and
quantitative data of the normal catic nerve. Sixty days after the application of ethylic alcohol - 95%, the left ciatic nerve of all animals were removed, processed for light and electron-microscopy,and carried to a histological and quantitative analysis. The results showed no histological differences between the groups I and II.The analysis of the number of the myelinic axons and the value of the cross section area showed no significant difference among the three groups. It was not seen any sign of intoxication by vitamins, with the doses used in the present study Ver menos
axon or both. This fact has lead to the recommendation that vitamins B complex can be administrated as a therapeutic method, but there is controversy about this. The aim of this work was to study the influency of the thiamine, pyridoxine and cobalamine in the course of axonal regeneration. Fully-grown rats were divided in three groups: I II III. In the animals of the
groups I and II were injected ethylic alcohol in concentrationof 95% in de left ciatic nerve, what promoted degeneration of the myelin sheat and the axon of the nerve fibers. The animals of the group I daily received thiamine, pyridoxine and cobalamine by oral way, that of the group II do not received the vitamins and that of the group III were used to provide histological and
quantitative data of the normal catic nerve. Sixty days after the application of ethylic alcohol - 95%, the left ciatic nerve of all animals were removed, processed for light and electron-microscopy,and carried to a histological and quantitative analysis. The results showed no histological differences between the groups I and II.The analysis of the number of the myelinic axons and the value of the cross section area showed no significant difference among the three groups. It was not seen any sign of intoxication by vitamins, with the doses used in the present study Ver menos
Regeneração axonal durante administração sistemica de tiamina, piridoxina e cianocobalamina
Osvaldo Benedito Rodrigues
Regeneração axonal durante administração sistemica de tiamina, piridoxina e cianocobalamina
Osvaldo Benedito Rodrigues
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