lactoferrin and betadex

An electrostatic nanocomplex between naturally occurring ε-poly-l-lysine (εPL) and β-cyclodextrin sulphate (sCD) was designed, and its capacity to entrap four model proteins with high or low molecular weight and isoelectric point, i.e., lactoferrin, albumin, actinidin, and lysozyme, was investigated. The optimal formulations gave nanocomplexes with an average diameter around 276 ± 16 nm, a ζ-potential of -39 ± 1.5 mV, and a spherical shape with a core-shell structure. Different strategies were pursued to increase the entrapment efficiency for selected proteins, which led to 40-100% entrapment depending on the protein type. Under simulated gastric conditions with pepsin, the complexes protected lactoferrin and albumin against proteolysis, whereas actinidin and lysozyme were intrinsically stable. In Caco-2 cells, these complexes transiently decreased the trans-epithelial electrical resistance, indicating the potential to enhance the paracellular permeability of bioactive macromolecules. Thus, these εPL-sCD complexes would be a promising system for loading diverse proteins for gastric protection and enhancing intestinal absorption.

Topics: Albumins; beta-Cyclodextrins; Caco-2 Cells; Cell Survival; Cells, Cultured; Cysteine Endopeptidases; Dose-Response Relationship, Drug; Drug Delivery Systems; Gastrointestinal Tract; Humans; Lactoferrin; Molecular Structure; Muramidase; Particle Size; Polylysine; Protective Agents; Structure-Activity Relationship; Surface Properties

The supramolecular inclusion properties of beta-cyclodextrin (beta-CD) and resveratrol (Res) were investigated using drug-protein interaction spectroscopy method. The differences between the results of interaction spectroscopy method and the results of classical method were compared. The total energy of the stable inclusion of cyclodextrin-resveratrol was calculated by Gaussian theory calculation. The stable inclusions in the process of interaction between resveratrol/inclusion complex and bovine lactgoferrin (BLF) were studied by molecular modeling. The results showed that the interaction spectroscopy method could explain the property of the inclusion in a more sensitive manner, it also interpreted the conveying mechanism of BLF binding with inclusion complex. The molecular modeling result showed consistent results with Gaussian theory calculation; both of the two methods obtained the stable configuration of beta-CD-Res inclusion. The relevant result provided an experimental consequence for the pharmacology research of beta-cyclodextrin-resveratrol inclusion complex as well as offering a new reference to the future research of supramolecular inclusion compound.

Topics: Animals; beta-Cyclodextrins; Cattle; Lactoferrin; Magnetic Resonance Spectroscopy; Models, Molecular; Resveratrol; Stilbenes