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Development of microparticles coated with poly-γ-glutamic acid to improve oral absorption of a poorly water-soluble drug. 2019

Yuri Ikeuchi-Takahashi, and Yudai Shiokawa, and Kazuki Sekita, and Etsuo Yonemochi, and Hiraku Onishi
a School of Pharmacy and Pharmaceutical Sciences , Hoshi University , Shinagawa City , Japan.

Novel microparticles coated with poly-γ-glutamic acid (PGA) were developed to improve the oral absorption of indomethacin (IM), a poorly water-soluble drug. Microparticles containing γ-IM (IMbulk-PGA) or crystal polymorph α-IM (IMpolymorph-PGA) were prepared. Additionally, microparticles were prepared containing α-IM without PGA (IMpolymorph without PGA). IMbulk-PGA and IMpolymorph-PGA exhibited better drug retention properties on mucin disks. Drug release rates from IMpolymorph-PGA and IMpolymorph without PGA were higher than from IM bulk powder, and drug release from IMbulk-PGA was also improved. Drug release from IMbulk-PGA could be improved with the use of Tween 80. In addition, PGA may influence the ionization of IM or affect specific molecular interactions. After the microparticles were administered orally to mice, IMbulk-PGA and IMpolymorph-PGA increased the plasma drug concentration more rapidly compared with IM bulk powder, but IMpolymorph without PGA did not increase the plasma drug concentration. It was considered that IMbulk-PGA and IMpolymorph-PGA rapidly reached the intestinal membrane through the mucus layer and IM was absorbed quickly. Because IMbulk-PGA and IMpolymorph-PGA showed a rapid increase in plasma drug concentration, IMbulk-PGA and IMpolymorph-PGA could be useful preparations to improve the gastrointestinal absorption of IM. Furthermore, IMbulk-PGA may maintain higher plasma drug concentrations than IMpolymorph-PGA.

UI MeSH Term Description Entries
D007213 Indomethacin A non-steroidal anti-inflammatory agent (NSAID) that inhibits CYCLOOXYGENASE, which is necessary for the formation of PROSTAGLANDINS and other AUTACOIDS. It also inhibits the motility of POLYMORPHONUCLEAR LEUKOCYTES. Amuno,Indocid,Indocin,Indomet 140,Indometacin,Indomethacin Hydrochloride,Metindol,Osmosin
D007408 Intestinal Absorption Uptake of substances through the lining of the INTESTINES. Absorption, Intestinal
D008297 Male Males
D008813 Mice, Inbred ICR An inbred strain of mouse that is used as a general purpose research strain, for therapeutic drug testing, and for the genetic analysis of CARCINOGEN-induced COLON CANCER. Mice, Inbred ICRC,Mice, ICR,Mouse, ICR,Mouse, Inbred ICR,Mouse, Inbred ICRC,ICR Mice,ICR Mice, Inbred,ICR Mouse,ICR Mouse, Inbred,ICRC Mice, Inbred,ICRC Mouse, Inbred,Inbred ICR Mice,Inbred ICR Mouse,Inbred ICRC Mice,Inbred ICRC Mouse
D011099 Polyglutamic Acid A peptide that is a homopolymer of glutamic acid. Polyglutamate
D000284 Administration, Oral The giving of drugs, chemicals, or other substances by mouth. Drug Administration, Oral,Administration, Oral Drug,Oral Administration,Oral Drug Administration,Administrations, Oral,Administrations, Oral Drug,Drug Administrations, Oral,Oral Administrations,Oral Drug Administrations
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012995 Solubility The ability of a substance to be dissolved, i.e. to form a solution with another substance. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Solubilities
D014867 Water A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Hydrogen Oxide
D016503 Drug Delivery Systems Systems for the delivery of drugs to target sites of pharmacological actions. Technologies employed include those concerning drug preparation, route of administration, site targeting, metabolism, and toxicity. Drug Targeting,Delivery System, Drug,Delivery Systems, Drug,Drug Delivery System,Drug Targetings,System, Drug Delivery,Systems, Drug Delivery,Targeting, Drug,Targetings, Drug

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