title: Lectin-conjugated PLGA nanoparticles loaded with thymopentin: ex vivo bioadhesion and in vivo biodistribution.
abstract: The conjugation of lectins onto PLGA nanoparticles has been demonstrated to effectively improve the intestinal absorption of thymopentin. In this study, thymopentin-loaded nanoparticles made from fluorescein isothiocyanate labeled PLGA were modified with wheat germ agglutinin (WGA). The specific bioadhesion of nanoparticles on rat intestinal mucosa was studied ex vivo. An important increase of interaction between WGA-conjugated nanoparticles and the intestinal segments was observed compared with that of the unconjugated one (p<0.05). Fluorescence photomicrographs confirmed the bioadhesion of WGA-conjugated nanoparticles on intestinal villous epithelium as well as Peyer's patches. Biodistribution of nanoparticles was evaluated using tissues obtained from rats, to which nanoparticles were orally administered. The highest amount of WGA-conjugated nanoparticles was detected in small intestine, suggesting an increase of intestinal bioadhesion and endocytosis. The systemic uptake was as high as 6.48-13.4% of dose at 1 day and 7.32-15.26% at 7 days, which representing an increase of almost 1.4-3.1 fold across the intestine compared to <4.9% of the unconjugated one. The enhanced uptake was related to the increasing of WGA density on nanoparticles. These results further revealed the promising potential of lectin-conjugated nanoparticles on the improvement of intestinal bioadhesion and absorption for oral drug delivery.
authors.affiliation: Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning, 110016, China.
authors.forename: YaShu
authors.initials: Y
authors.lastname: Yin
authors.forename: DaWei
authors.initials: D
authors.lastname: Chen
authors.forename: MingXi
authors.initials: M
authors.lastname: Qiao
authors.forename: XiuYan
authors.initials: X
authors.lastname: Wei
authors.forename: HaiYang
authors.initials: H
authors.lastname: Hu
mesh_terms: D000818:Animals; D007408:Intestinal Absorption / Q000187:drug effects / Q000502:physiology; D019344:Lactic Acid / Q000737:chemistry / Q000493:pharmacokinetics*; D053758:Nanoparticles / Q000737:chemistry; D011100:Polyglycolic Acid / Q000737:chemistry / Q000493:pharmacokinetics*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D016305:Thymopentin / Q000737:chemistry / Q000493:pharmacokinetics*; D014018:Tissue Distribution / Q000187:drug effects / Q000502:physiology; D014909:Wheat Germ Agglutinins / Q000737:chemistry / Q000493:pharmacokinetics*
chemical_list: D011108:Polymers; D014909:Wheat Germ Agglutinins; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D016305:Thymopentin