Ascorbic acid (AA) is able to neutralize reactive oxygen species and is essential for collagen synthesis. In aging process oxidative stress is elevated. This study aims to investigate the effects of AA supplementation on the periodontal ligament (PL) of rats during aging. Twenty five rats were used...

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Main Authors: Jacqueline N. Zanoni, Nathalia M. Lucas, Aline R. Trevizan, Ivan D.S. Souza
Format: Article
Language:English
Published: Academia Brasileira de Ciências 2013-01-01
Series:Anais da Academia Brasileira de Ciências
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Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100327
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Summary:Ascorbic acid (AA) is able to neutralize reactive oxygen species and is essential for collagen synthesis. In aging process oxidative stress is elevated. This study aims to investigate the effects of AA supplementation on the periodontal ligament (PL) of rats during aging. Twenty five rats were used and divided into groups: J90 (90-day-old control), E345 (345-day-old control), E428 (428-day-old control), EA345 (345-day-old supplemented with AA from 90-day-old on) and EA428 (428-day-old supplemented with AA from 90-day-old on). We analyzed the thickness, density of fibroblasts and blood vessels and collagen fibers types in the PL. In group J90 there was predominantly type III collagen fibers (87.64%). In animals supplemented with AA, the area filled by type I fibers (group EA345: 65.67%, group EA428: 52.23%) was higher than type III fibers. PL in group EA428 was thicker than the one observed in group E428 (P < 0.05). During natural aging process, AA promoted the maturation of collagen fibers and enhanced angiogenesis in periodontal ligament. One can conclude that the supplementation with AA represented a beneficial factor for the development of PL in aged rats.<br>O &#225;cido asc&#243;rbico (AA) neutraliza essas esp&#233;cies reativas de oxig&#234;nio e &#233; imprescind&#237;vel para a s&#237;ntese do col&#225;geno. No processo de envelhecimento ocorre aumento do estresse oxidativo. Objetivamos investigar o efeito da suplementa&#231;&#227;o com AA sobre o ligamento periodontal (LP) de ratos durante o processo de envelhecimento. Foram utilizados 25 ratos divididos em cinco grupos: J90 (90 dias de idade), E345 (345 dias de idade), E428 (428 dias de idade), EA345 (tratados com AA do 90&#186; ao 345&#186; dia) e EA428 (tratados com AA do 90&#186; ao 428&#186; dia). Foram analisadas espessura, densidade de fibroblastos e vasos sangu&#237;neos, e o tipo de fibra col&#225;gena presente no LP. No grupo J90 houve um predom&#237;nio de fibras col&#225;genas do tipo III (87,64%). Nos animais suplementados com AA, a &#225;rea ocupada pelas fibras tipo I (grupo EA345 - 65,67%; grupo EA428 - 52,23%) foi maior que aquelas do tipo III. A espessura do LP no grupo EA428 foi maior do que a observada no grupo E428 (P < 0,05). No processo de envelhecimento natural o AA atuou na matura&#231;&#227;o das fibras col&#225;genas e estimulou a angiog&#234;nese no ligamento periodontal. Pode-se concluir que a suplementa&#231;&#227;o com AA foi positiva para o LP de ratos envelhecidos.
ISSN:0001-3765
1678-2690