Hydroboration des polyalcadienes et de leurs modeles par les bis-boracyclanes

Evaluation of Cytotoxicity and Anti-Angiogenesis Induced by Crocetin-Delivering Alginate Hydrogel/Chitosan Nanoparticle Carrier System on Human Ovarian Cancer Cell Line (A2780): An In Vitro Evaluation

In the current study, the anticancer activity of Crocetin-loaded chitosan nanoparticles incorporated into an alginate hydrogel on ovarian cancer cells was investigated. Crocetin was loaded into chitosan nanoparticles via ionotropic gelation method and then incorporated into the alginate hydrogel. Then, various In Vitro experiments were performed to characterize the produced delivery system. The anticancer activity of the developed system was evaluated on A2780 cell line. Results showed that Crocetin-loaded carrier system significantly reduced the viability of ovarian cancer cells via PI3K/AKT/mTOR signaling pathway. Furthermore, the anticancer activity of the developed system was associated with a significant reduction in the expression level of VEGF gene. This study suggests potential use of this system to treat ovarian cancer.

A solanesol-derived scaffold for multimerization of bioactive peptides

A flexible molecular scaffold bearing varying numbers of terminal alkyne groups was synthesized in five steps from solanesol. R(CO)-MSH(4)-NH(2) ligands, which have a relatively low affinity for binding at the human melanocortin 4 receptor (hMC4R), were prepared by solid phase synthesis and were N-terminally acylated with 6-azidohexanoic acid. Multiple copies of the azide N(3)(CH(2))(5)(CO)-MSH(4)-NH(2) were attached to the alkyne-bearing, solanesol-derived molecular scaffold via the copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. Control studies showed that the binding affinity of the triazole-containing ligand, CH(3)(CH(2))(3)(C(2)N(3))(CH(2))(5)(CO)-MSH(4)-NH(2), was not significantly diminished relative to the corresponding parental ligand, CH(3)(CO)-MSH(4)-NH(2). In a competitive binding assay with a Eu-labeled probe based on the superpotent ligand NDP-alpha-MSH, the monovalent and multivalent constructs appear to bind to hMC4R as monovalent species. In a similar assay with a Eu-labeled probe based on MSH(4), modest increases in binding potency with increased MSH(4) content per scaffold were observed.