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Título: Overexpression of iNOS and down-regulation of BMPs-2, 4 and 7 in retinoic acid induced cleft palate formation
Fecha de publicación: 2004
Editorial: Murcia : F. Hernández
ISSN: 0213-3911
Materias relacionadas: CDU::6 - Ciencias aplicadas::61 - Medicina::612 - Fisiología
Palabras clave: Retinoic acid
Cleft palate
Resumen: The present work studied the induction of cleft palate formation in embryos developed from pregnant BALB/c mice treated orally with retinoic acid (RA). Previous studies on mature somatic cell types showed that RA exerted inhibitory effects on inducible nitric oxide synthase (iNOS) production. For the first time, our study has shown that RA actually stimulates significant expression of iNOS at specific zones of the affected embryonic palatal tissues at three consecutive stages, from gestation day 13 (GD13) to day 16 (GD16). Enzymatically, iNOS facilitates intracellular nitric oxide (NO) synthesis from L-arginine. When NO reacts with reactive superoxides it may result in irreparable cell injury. NO was also reported to induce apoptosis in some mammalian cell systems. Based on our findings, we propose that such an increase in NO production might be associated with apoptosis in the embryonic palatal tissues in the RA-treated mice. The detrimental effects of NO resulted in a reduction in proliferating palatal cells and therefore disturbed the normal plasticity of the palatal shelves. With iNOS overexpression, our findings also showed that there was significant concomitant down-regulation in the expressions of Bone Morphogenetic Proteins (BMPs) –2, 4, and 7 with regional variations particularly in the palatal mesenchymal cells for those embryos developing cleft palate. Since specific spatial and temporal expressions of BMPs –2, 4, and 7 are critical during normal palatal morphogenesis, any deficiency in the epithelialmesenchymal interaction may result in retarding growth at the embryonic palatal shelves. Taken together, our study has demonstrated cleft palate formation in the BALB/c embryos involved overexpression of iNOS and down-regulation of BMPs- 2, 4 and 7.
Autor/es principal/es: Ho, C.T.
Lau, T.Y.H.
Jin, Y.
Lu, H.B.
Liong, E.
Leung, K.M.
Tipoe, G.L.
Publicado en: Histology and histopathology
URI: http://hdl.handle.net/10201/21545
Tipo de documento: info:eu-repo/semantics/article
Número páginas / Extensión: 10
Derechos: info:eu-repo/semantics/openAccess
Aparece en las colecciones:Vol.19, nº 1 (2004)

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