title: Anti-angiogenic and anti-cancer evaluation of betulin nanoemulsion in chicken chorioallantoic membrane and skin carcinoma in Balb/c mice.
abstract: Betulin (Bet), the main component of birch tree bark, has been recently reported to exert anticancer activity in several cell lines; however the underlying mechanisms are only partially elucidated. The aims of the present work were to assess the in vivo effects of betulin administered as nanoemulsion (NE) in two experimental models: (i) the chicken embryo chorioallantoic membrane (CAM) assay for the study of anti-angiogenic effects and (ii) the two-stage model of skin carcinoma induced in mice for the study of anti-tumor and anti-inflammatory effects, respectively. On the CAM of the chicken betulin in nanoemulsion (BetNE) shows a good penetrability at extra-embryonic tissue level, affecting both the chorioallantoic membrane as well as the yolk sac by reducing the capillary density. In the animal model, the potential impact of local application of betulin on the respiratory function of isolated liver mitochondria was further assessed. Topical application of betulin nanoemulsion for 12 weeks together with DMBA (7,12-dimethylbenz[a]anthracene) and TPA (12-O-tetradecanoylphorbol 13-acetate), as tumor initiator and promoter, enhanced the active respiration of isolated liver mitochondria. Betulin also inhibit skin tumor apparition and promotion, proved by histological results and VEGF (vascular endothelial growth factor) expression correlated to non-invasive measurements. Betulin is active in nanoemulsion formulation as a potential inhibitory on the angiogenic process in CAM assay. BetNE can develop a potent anti-inflammatory and anti-carcinogenic activity with a low toxicity at skin level. It can also influence the penetration of carcinogens and reduce damage in main organs (e.g., liver).
authors.affiliation: Faculty of Pharmacy, Department of Toxicology, Victor Babes University of Medicine and Pharmacy Timişoara, Eftimie Murgu Square, No. 2, 300041, România.
authors.forename: Cristina A
authors.initials: CA
authors.lastname: Dehelean
authors.forename: Stefana
authors.initials: S
authors.lastname: Feflea
authors.forename: Dorina
authors.initials: D
authors.lastname: Gheorgheosu
authors.forename: Srinivas
authors.initials: S
authors.lastname: Ganta
authors.forename: Anca M
authors.initials: AM
authors.lastname: Cimpean
authors.forename: Danina
authors.initials: D
authors.lastname: Muntean
authors.forename: Mansoor M
authors.initials: MM
authors.lastname: Amiji
mesh_terms: D020533:Angiogenesis Inhibitors / Q000494:pharmacology*; D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D019069:Cell Respiration / Q000187:drug effects; D002642:Chick Embryo; D049033:Chorioallantoic Membrane / Q000098:blood supply* / Q000187:drug effects; D004655:Emulsions; D007150:Immunohistochemistry; D051379:Mice; D008807:Mice, Inbred BALB C; D053758:Nanoparticles / Q000737:chemistry*; D018919:Neovascularization, Physiologic / Q000187:drug effects; D010101:Oxygen Consumption / Q000187:drug effects; D012878:Skin Neoplasms / Q000098:blood supply / Q000188:drug therapy*; D014315:Triterpenes / Q000494:pharmacology / Q000627:therapeutic use*; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism; D000094062:Betulinic Acid
chemical_list: D020533:Angiogenesis Inhibitors; D016588:Anticarcinogenic Agents; D004655:Emulsions; D014315:Triterpenes; D042461:Vascular Endothelial Growth Factor A; C002503:betulin; D000094062:Betulinic Acid