title: Nanostructured mucoadhesive microparticles for enhanced preocular retention.
abstract: We describe nanostructured microparticles (NMs) containing a mucoadhesive polymer for enhanced preocular retention and consider them as potential carriers of drugs to the eye. These NMs are each composed of entangled nanofibers to give an enlarged specific surface area, and thus can better adhere to the preocular mucus surface. This physical design allows the microparticles still to be composed mainly of a wall material, poly(lactic-co-glycolic acid), as required for controlled drug delivery, while the effects of an additive, mucoadhesive material, polyethylene glycol, can be synergistically improved via the nanostructured morphology. Thus, when formulated in a dry tablet dosage form, the NMs in this work show more than a 10-fold increase in preocular retention in vivo compared to conventional spherical microparticles. Therefore, we conclude that these mucoadhesive NMs can reside on the preocular surface for a prolonged period, and thus appear to be a promising system for topical drug delivery to the eye.
authors: Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 152-742, Republic of Korea.
authors: Chun Gwon
authors: CG
authors: Park
authors: Mi Jeung
authors: MJ
authors: Kim
authors: Min
authors: M
authors: Park
authors: Sung Yoon
authors: SY
authors: Choi
authors: Seung Ho
authors: SH
authors: Lee
authors: Ji Eun
authors: JE
authors: Lee
authors: Gyeong-Seon
authors: GS
authors: Shin
authors: Ki Ho
authors: KH
authors: Park
authors: Young Bin
authors: YB
authors: Choy
mesh_terms: D000268:Adhesiveness; D000818:Animals; D002626:Chemistry, Pharmaceutical; D005123:Eye / Q000378:metabolism*; D019344:Lactic Acid / Q000737:chemistry; D008297:Male; D008856:Microscopy, Fluorescence; D008863:Microspheres; D009093:Mucus / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011817:Rabbits; D013607:Tablets
chemical_list: D013607:Tablets; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D011092:Polyethylene Glycols
keywords: Mucosal adhesion; Nanofibers; Nanostructured microparticle; Ophthalmology; Specific surface area