Development of biocompatible polymeric systems capable of cell adhesion and proliferation is a challenging task. Proper cross-linking of small cell adhesive peptide sequences is useful in this respect as it provides the inherent nontoxic environment as well as the cross-linked polymeric network to the cells for adhesion and proliferation. A multiple cross-linking strategy is applied to create a peptide-based cross-linked polymer. Covalent linkage through disulfide bond formation, supramolecular linkage using homoternary complexation by CB[8], and enzymatic cross-linking by HRP-mediated dimerization of tyrosine are used to prepare the cross-linked, peptide-based polymer decorated with cell-adhesive RGDS sequence. The supramolecular cross-linking via CB[8] provided stability as well as brings the RGDS sequences at the surface of the polymer particles. The order of cross-linking allowed to fine-tune the particle size of the polymer and polymer particles of wide range (200–1000 nm) can be prepared by varying the order. The cross-linked polymer particles (P1 and P2) were found to be stable at wide range of temperature and pH. Moreover, as intended, the polymer was noncytotoxic in nature and showed efficient cell adhesion and proliferation property, which can be used for further biological applications.
开发能使细胞粘附和增殖的
生物相容性聚合物系统是一项具有挑战性的任务。在这方面,小细胞粘附肽序列的适当交联非常有用,因为它为细胞提供了固有的无毒环境以及交联聚合物网络,有利于细胞粘附和增殖。我们采用多重交联策略来制造肽基交联聚合物。通过二
硫键形成的共价连接、CB[8] 同源络合的超分子连接,以及 HRP 介导的
酪氨酸二聚化酶促交联,制备出装饰有细胞粘附性 RGDS 序列的交联肽基聚合物。通过 CB[8] 进行的超分子交联提供了稳定性,并将 RGDS 序列带到了聚合物颗粒的表面。交联顺序可以微调聚合物的粒径,通过改变交联顺序可以制备出大范围(200-1000 nm)的聚合物颗粒。交联聚合物颗粒(P1 和 P2)在很宽的温度和 pH 值范围内都很稳定。此外,正如预期的那样,这种聚合物无细胞毒性,并显示出高效的细胞粘附和增殖特性,可用于进一步的
生物应用。