Dose-dependent in vitro inhibition of rabbit corneal matrix metalloproteinases by an extract of Pothomorphe umbellata after alkali injury

Dose-dependent in vitro inhibition of rabbit corneal matrix metalloproteinases by an extract of Pothomorphe umbellata after alkali injury

Autor Barros, L.f.m. Google Scholar
Barros, P.s.m. Google Scholar
Röpke, C.d. Google Scholar
Silva, V.v. Google Scholar
Sawada, T.c.h. Google Scholar
Barros, S.b.m. Google Scholar
Belfort, Rubens Junior Autor UNIFESP Google Scholar
Instituição Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Resumo The in vitro ability of Pothomorphe umbellata ethanolic crude extract to inhibit matrix metalloproteinase (MMP) in normal cornea and in cornea after alkali injury was demonstrated. Corneas of albino rabbits were injured with 1 N NaOH for 20 s. After 48 h the corneas were excised, homogenized and analyzed for MMP-9 (92 kDa), pro-MMP-2 (72 kDa) and MMP-2 (67 kDa) activity by gelatin zymography. The activity was also measured in untreated corneas. After electrophoresis of 20 µg protein, gels were incubated with 50, 100, or 250 µg/mL lyophilized hydroethanolic (1:1) root crude extract of P. umbellata standardized for 4-nerolidylcatechol (7.09%). The activity of the enzymes was compared with that of untreated gel. At 48 h after injury, the activity of all MMPs was increased compared with untreated eyes. When the gels were incubated with P. umbellata extract the activity of MMP-2, pro-MMP-2 and MMP-9 decreased in a dose-dependent manner. MMP-9 activity decreased by approximately 50% after incubation with 50 µg/mL and was completely abolished at 100 and 250 µg/mL of the extract. After incubation with 50 µg/mL the activity of pro-MMP-2 and MMP-2 also decreased by 50%. The activity of pro-MMP-2 was almost completely abolished after incubation with 250 µg/mL of the extract. For MMP-2 the incubation with 100 or 250 µg/mL of the extract of P. umbellata promoted a 10-fold decrease in activity. In conclusion, P. umbellata root crude extract can be useful as an alternative therapy to control MMP activity after corneal injury.
Palavra-chave Cornea
Alkali injury
Metalloproteinases
Pothomorphe umbellata
Idioma Inglês
Data de publicação 2007-08-01
Publicado em Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 40, n. 8, p. 1129-1132, 2007.
ISSN 0100-879X (Sherpa/Romeo)
Publicador Associação Brasileira de Divulgação Científica
Extensão 1129-1132
Fonte http://dx.doi.org/10.1590/S0100-879X2006005000120
Direito de acesso Acesso aberto Open Access
Tipo Artigo
SciELO S0100-879X2007000800014 (estatísticas na SciELO)
Endereço permanente http://repositorio.unifesp.br/handle/11600/3809

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