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Le complexe acide ascorbique-cyclodextrine modifie l'expression des gènes associés au métabolisme des lipides chez des embryons produits in vitro par des bovins.

L'acide ascorbique (AC) utilisé comme antioxydant en culture d'embryons est très sensible et se dégrade inévitablement en solution aqueuse. La méthyl-bêta-cyclodextrine (CD) améliore la stabilité de l'AC en solution à des températures élevées, à la lumière, à l'humidité et à l'oxydation. Le but de cette étude était d'évaluer l'effet du complexe AC-CD au cours de la maturation in vitro (IVM) ou de la culture in vitro (IVC) sur la compétence en développement d'ovocytes et le développement et la qualité d'embryons ultérieurs. Du AC-CD (100 μM) a été ajouté au milieu IVM et le niveau de maturation et le développement de l'embryon ont été examinés. Les ovocytes maturés, leurs cellules de cumulus et les blastocystes produits ont été congelés par capture instantanée pour l'analyse de l'expression génique par RT-qPCR. En outre, des zygotes produits in vitro ont été cultivés avec 100 μM de AC-CD et des blastocystes ont également été congelés pour l’analyse de l’expression génique. Un groupe sans AC-CD (contrôle (-)) et autre avec CD (contrôle (+)) a été inclus. Aucune différence n'a été trouvée sur les taux de maturation, de clivage ou de blastocyste. Cependant, dans les ovocytes matures, les régulateurs BAX, GPX1 et BMP15 de l'AC-CD ont été régulés négativement. Dans les cellules de cumulus, BAX / BCL2 et GSTA4 ont été régulés négativement tandis que BCL2 et CYP51A1 ont été régulés positivement. L'expression de SL2A1, FADS1, PNPLA et MTORC1 a été régulée négativement dans les blastocystes dérivés d'ovocytes maturés avec AC-CD, tandis que dans les blastocystes dérivés de zygote cultivé avec AC-CD, CYP51A1 et IGF2R ont été sous-régulés et sous-régulés. En conclusion, l'AC-CD dans les milieux IVM et IVC peut réduire l'accumulation de graisse en augmentant la lipolyse et en supprimant la lipogenèse dans les blastocystes dérivés d'ovocytes et de zygotes cultivés avec AC-CD, suggérant que la CD améliore la qualité des embryons et la biodisponibilité de l'AC pendant l'IVM et IVC.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30120843


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