title: Stabilized calcium phosphate nano-aggregates using a dopa-chitosan conjugate for gene delivery.
abstract: Calcium phosphate (CAP) has a wide range of applications in biomedical systems. Although there is great potential for the use of CAP in the development of gene delivery systems, the uncontrollable growth of CAP crystal makes it difficult to use in a practical nano-gene delivery system. The purpose of this study was to develop nano-sized CAP particles containing nucleic acids (e.g. DNA, siRNA). The CAP nano-aggregates (CAP/pDNA/dopa-Chi) were successfully prepared by serial addition of plasmid DNA (pDNA) and dopa (3,4-dihydroxy-L-phenylalanine) modified chitosan to growing CAP particles in calcium phosphate solution. The addition of the dopa moiety is thought to enable chitosan adsorption onto the surface of forming calcium phosphate particles to prevent further growth. The CAP/pDNA/dopa-Chi significantly increased the serum stability of pDNA, and showed high cellular uptake efficiency and trans-gene expression. Additionally, the chitosan stabilized CAP nano-aggregates were also prepared for siRNA delivery (CAP/siRNA/dopa-Chi) via the same method as for CAP/pDNA/dopa-Chi. A notable siRNA gene silencing effect of CAP/siRNA/dopa-Chi was exhibited without any sign of cytotoxicity.
authors: School of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors: Kyuri
authors: K
authors: Lee
authors: Mi Hwa
authors: MH
authors: Oh
authors: Min Sang
authors: MS
authors: Lee
authors: Yoon Sung
authors: YS
authors: Nam
authors: Tae Gwan
authors: TG
authors: Park
authors: Ji Hoon
authors: JH
authors: Jeong
mesh_terms: D000818:Animals; D019556:COS Cells; D002130:Calcium Phosphates / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D002522:Chlorocebus aethiops; D004247:DNA / Q000008:administration & dosage / Q000737:chemistry; D004295:Dihydroxyphenylalanine / Q000737:chemistry*; D020868:Gene Silencing; D018014:Gene Transfer Techniques; D053758:Nanoparticles / Q000737:chemistry*; D034741:RNA, Small Interfering / Q000008:administration & dosage; D044967:Serum / Q000737:chemistry
chemical_list: D002130:Calcium Phosphates; D034741:RNA, Small Interfering; D004295:Dihydroxyphenylalanine; D004247:DNA; D048271:Chitosan; C020243:calcium phosphate