Enhanced passive pulmonary targeting and retention of PEGylated rigid microparticles in rats

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• 作者：Hilliard L. Kutscher ; Piyun Chao ; Manjeet Deshmukh ; Sujata Sundara Rajan ; Yashveer Singh ; Peidi Hu ; Laurie B. Joseph ; Stanley Stein ; Debra L. Laskin ; Patrick J. Sinko
• 关键词：Passive pulmonary targeting ; Rigid non-biodegradable microparticle ; Poly(ethylene glycol) ; PEGylation
• 刊名：International Journal of Pharmaceutics
• 出版年：2010
• 出版时间：15 December 2010
• 年：2010
• 卷：402
• 期：1-2
• 页码：64-71
• 全文大小：609 K

文摘

The current study examines the passive pulmonary targeting efficacy and retention of 6 μm polystyrene (PS) microparticles (MPs) covalently modified with different surface groups [amine (A-), carboxyl (C-) and sulfate (S-)] or single (PEG₁-) and double (PEG₂-) layers of α,ω-diamino poly(ethylene glycol) attached to C-MPs. The ζ-potential of A-MPs (−44.0 mV), C-MPs (−54.3 mV) and S-MPs (−49.6 mV) in deionized water were similar; however PEGylation increased the ζ-potential for both PEG₁-MPs (−18.3 mV) and PEG₂-MPs (11.5 mV). The biodistribution and retention of intravenously administered MPs to male Sprague–Dawley rats was determined in homogenized tissue by fluorescence spectrophotometry. PEG₁-MPs and PEG₂-MPs demonstrated enhanced pulmonary retention in rats at 48 h after injection when compared to unmodified A-MPs (59.6 % , 35.9 % and 17.0 % of the administered dose, respectively). While unmodified MPs did not significantly differ in lung retention, PEGylation of MPs unexpectedly improved passive lung targeting and retention by modifying surface properties including charge and hydrophobicity but not size.