The alkaloid centcyamine increases expression of klotho and lamin B1, slowing the onset of skin ageing in vitro and in vivo / Sophie Abadie in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 5 (10/2021)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 5 (10/2021) . - p. 561-572 Titre : The alkaloid centcyamine increases expression of klotho and lamin B1, slowing the onset of skin ageing in vitro and in vivo Type de document : document électronique Auteurs : Sophie Abadie, Auteur ; Claire Leduc, Auteur ; Karl Lintner, Auteur ; Philippe Bedos, Auteur Année de publication : 2021 Article en page(s) : p. 561-572 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Centcyamine Génétique Justification de l'allégation Peau -- Physiologie Protéomique La protéomique désigne la science qui étudie les protéomes, c'est-à-dire l'ensemble des protéines d'une cellule, d'un organite, d'un tissu, d'un organe ou d'un organisme à un moment donné et sous des conditions données. Dans la pratique, la protéomique s'attache à identifier de manière globale les protéines extraites d'une culture cellulaire, d'un tissu ou d'un fluide biologique, leur localisation dans les compartiments cellulaires, leurs éventuelles modifications post-traductionnelles ainsi que leur quantité. Elle permet de quantifier les variations de leur taux d'expression en fonction du temps, de leur environnement, de leur état de développement, de leur état physiologique et pathologique, de l'espèce d'origine. Elle étudie aussi les interactions que les protéines ont avec d'autres protéines, avec l'ADN ou l'ARN, ou d'autres substances. La protéomique fonctionnelle étudie les fonctions de chaque protéine. La protéomique étudie enfin la structure primaire, secondaire et tertiaire des protéines. (Wikipedia) Vieillissement Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Background : Klotho is a protein known for its beneficial effects on longevity. Centcyamine is an alkaloid present in certain plants whose extracts have an anti-inflammatory effect. Skin fibroblasts are essential to the formation and structure of the dermis. - Objective : Centcyamine is an indole-based alkaloid composed of coumaric acid, a resveratrol precursor and methoxytryptamine, which can be both a precursor, or a derivative, of melatonin. Given these building blocks and their well-known bioactivities, it was of interest to explore the potential benefits of using this aryl-alkaloid, in cosmetic skincare applications. - Methods : We tested cultured normal human dermal fibroblasts (NHDF) in vitro to observe how supplementation with centcyamine improves properties of the cells to counteract the effect of ageing. The expression of genes and proteins of interest was quantified. The effect on doubling time and cell function was evaluated following treatment of the cells over several replication cycles. Skin firmness, red spot index and skin isotropy were measured with Dynaskin®, Visia® and Primos® equipment, respectively, and compared over two months in a vehicle-controlled clinical trial on 60 persons. - Results : Centcyamine activates the expression of the gene KL and the related protein Klotho in dermal fibroblasts. Moreover, centcyamine slows the replicative ageing process of fibroblasts in culture. These cells retain cellular functions identical to those of young cells: the synthesis of lamin B1, a crucial regulatory protein of proliferation, as well as of collagen I and elastin is retained in aged cells. The clinical data are shown to improve skin isotropy in a majority of subjects, to reduce the red spot intensity and to maintain skin firmness in the treated group vs. the vehicle. - Conclusion : The alkaloid centcyamine induces changes in the metabolism of the ageing process of human dermal fibroblasts. The up-to-now unobserved implication of both Klotho and lamin B1 to maintain homeostasis of the skin opens new venues for the prevention of age-related changes in skin structure. The in vitro and clinical data, while not demonstrated to be causally related, converge towards a common goal of skin repair and slower ageing processes. Note de contenu : - MATERIAL AND METHODS : Effect of centcyamine on fibroblasts - Effect of centcyamine on replicative ageing of fibroblasts - Clinical trial - Statistical analysis - RESULTS : Gene array - Protein synthesis - Cell proliferation and function - Clinical trial - Table 1 : Centcyamine modulates gene expression in dermal fibroblast : qPCR on NHDF after 24h of Centcyamine treatment DOI : https://doi.org/10.1111/ics.12731 En ligne : https://drive.google.com/file/d/1DV4r7r8Kf2HRANTGmjL83vBpp5JhohVc/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36860 [article]

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