作者:Samantha McRae Page、Sangram Parelkar、Alex Gerasimenko、Dong Yeop Shin、Shelly R. Peyton、Todd Emrick
DOI:10.1039/c3tb21493a
日期:——
The growing interest in regenerative medicine has created a need for superior polymer matrices that suit multiple physical, mechanical, and biological requirements. While the phospholipid bilayer of a cell membrane is considered optimal for interacting with biologics, polymeric materials composed of 2-methacryloyloxyethyl phosphorylcholine (MPC) offer a cell membrane-like synthetic alternative. In this work, thiol-containing phosphorylcholine polymers were synthesized by radical copolymerization of a lipoic acid-functionalized methacrylate with MPC. The canonical cell adhesion oligopeptide (GRGDS) was incorporated into the polymers by copolymerization of a GRGDS-containing methacrylamide prepared by solid phase peptide synthesis. The relative amounts of phosphorylcholine, lipoic acid and oligopeptide were controlled by the monomer feed ratios, and the polymers were characterized by NMR spectroscopy and aqueous gel permeation chromatography (GPC). These multifunctional polymers formed hydrogels rapidly (<10 minutes) by Michael addition when poly(ethylene glycol)diacrylate (PEGDA) was added at pH 9 – an initiator-free gelation performed in a completely aqueous environment. Two cell lines, live mouse skeletal muscle myoblasts (C2C12) and human ovarian cancer (SKOV3) cells, were observed to specifically attach, spread and proliferate only on hydrogels containing the GRGDS peptide sequence, with a notable dependence on peptide concentration. The remarkable hydrophilicity and biocompatibility attributed to polyMPC combined with the facile gelation conditions of these polymers affords a platform of new bio-cooperative materials suitable for cell studies.
人们对再生医学日益增长的兴趣产生了对满足多种物理、机械和生物要求的优质聚合物基质的需求。虽然细胞膜的磷脂双层被认为是与生物制剂相互作用的最佳选择,但由 2-甲基丙烯酰氧基乙基磷酰胆碱 (MPC) 组成的聚合物材料提供了一种类似细胞膜的合成替代品。在这项工作中,通过硫辛酸官能化的甲基丙烯酸酯与MPC的自由基共聚合成了含硫醇的磷酸胆碱聚合物。通过固相肽合成制备的含有 GRGDS 的甲基丙烯酰胺的共聚,将经典细胞粘附寡肽 (GRGDS) 掺入聚合物中。通过单体进料比控制磷酸胆碱、硫辛酸和寡肽的相对量,并通过核磁共振波谱和水凝胶渗透色谱(GPC)对聚合物进行表征。当在 pH 9 下添加聚乙二醇二丙烯酸酯 (PEGDA) 时,这些多功能聚合物通过迈克尔加成快速形成水凝胶(<10 分钟),这是在完全水性环境中进行的无引发剂凝胶化。据观察,活小鼠骨骼肌成肌细胞 (C2C12) 和人卵巢癌 (SKOV3) 两种细胞系仅在含有 GRGDS 肽序列的水凝胶上特异性附着、扩散和增殖,并且显着依赖于肽浓度。 PolyMPC 卓越的亲水性和生物相容性与这些聚合物易于凝胶化的条件相结合,为适合细胞研究的新型生物协同材料提供了平台。