Effect of MePEG molecular weight and particle size on in vitro release of tumor necrosis factor-α-loaded nanoparticles

• 来源期刊: 中国药理学报（英文版）
• 关键词: tumor necrosis factor-alpha stealth nanoparticles polyethylene glycols poly(methoxypolyethyleneglycol cyanoacrylate-con-hexadecyl cyanoacrylate)
• 年，卷（期）: 2005,（2）
• 页码范围: 242-249
• 页数: 8页
• 语种: 英文

摘要

Aim: To study the in vitro release of recombinant human tumor necrosis factor alpha (rHuTNF-α) encapsulated in poly (methoxypolyethyleneglycol cyanoacrylate-co-n-hexadecyl cyanoacrylate) (PEG-PHDCA) nanoparticles, and investigate the influence of methoxypolyethyleneglycol (MePEG) molecular weight and particle size. Methods: Three sizes (approximately 80, 170, and 240 nm) of PEG PHDCA nanoparticles loading rHuTNF-α were prepared at different MePEG mo lecular weights (Mr =2000, 5000, and 10 000) using the double emulsion method. The in vitro rHuTNF-α release was studied in PBS and rat plasma. Results: A higher burst-release and cumulative-release rate were observed for nanoparticles with higher MePEG molecular weight or smaller particle size. A decreased cu- mulative release of rHuTNF-α following the initial burst effect was found in PBS, while the particle sizes remained constant and MePEG liberated. In contrast, in rat plasma, slowly increased cumulative-release profiles were obtained after the burst effect. During a 5-h incubation in rat plasma, more than 50% of the PEG PHDCA nanoparticles degraded. Conclusion: The MePEG molecular weight and particle size had an obvious influence on rHuTNF-α release. rHuTNF-α released from PEG-PHDCA nanoparticles in a diffusion-based pattern in PBS, but in a diffusion and erosion-controlled manner in rat plasma.