Epigallocatechin-3-gallat (EGCG), ein Catechin des grünen Tees, als Therapeutikum im DSS-Kolitis-Modell der Maus

Gewebecharkteristika chronisch entzündlicher Darmerkrankungen (Morbus Crohn oder Colitis Ulcerosa) sind vermehrte Leukozyteninfiltration und oxidativer Stress durch verstärktes Auftreten reaktiver Sauerstoffspezies. Ein Catechin der Spezies Camellia, (2R,3R)-2-(3,4,5-Trihydroxyphenyl)-3,4-dihydro-1(2H)-benzopyran-3,5,7-triol-3-(3,4,5-trihydroxybenzoat), Epigallocatechin-3-gallat (EGCG), zeigt antientzündliche und antioxidative Eigenschaften. Ziel dieser Studie war die Evaluation der therapeutischen Effekte des EGCG in einem murinen DSS-Kolitismodell. Die tägliche Gabe umfasste 6.9 mg/kg Körpergewicht EGCG. Behandelte Mäuse zeigten eine signifikante Gewichtsstabilisierung, Verlängerung des Überlebens und Reduktion proinflammatorischer Zytokine. Außerdem waren die Gewebekonzentrationen von Malondialdehyd, Endprodukt der Lipidperoxidation signifikant reduziert, während antioxidativ wirkende Gewebeenzyme eine verstärkte Aktivität aufwiesen

Quantitative Stain-free and Continuous Multimodal Monitoring of Wound Healing in vitro with Digital Holographic Microscopy

Impaired epithelial wound healing has significant pathophysiological implications in several conditions including gastrointestinal ulcers, anastomotic leakage and venous or diabetic skin ulcers. Promising drug candidates for accelerating wound closure are commonly evaluated in in vitro wound assays. However, staining procedures and discontinuous monitoring are major drawbacks hampering accurate assessment of wound assays. We therefore investigated digital holographic microscopy (DHM) to appropriately monitor wound healing in vitro and secondly, to provide multimodal quantitative information on morphological and functional cell alterations as well as on motility changes upon cytokine stimulation. Wound closure as reflected by proliferation and migration of Caco-2 cells in wound healing assays was studied and assessed in time-lapse series for 40 h in the presence of stimulating epidermal growth factor (EGF) and inhibiting mitomycin c. Therefore, digital holograms were recorded continuously every thirty minutes. Morphological changes including cell thickness, dry mass and tissue density were analyzed by data from quantitative digital holographic phase microscopy. Stimulation of Caco-2 cells with EGF or mitomycin c resulted in significant morphological changes during wound healing compared to control cells. In conclusion, DHM allows accurate, stain-free and continuous multimodal quantitative monitoring of wound healing in vitro and could be a promising new technique for assessment of wound healing