Oligoproline-containing peptides, GPPG and GPPPG, were designed and developed for nanoparticle-based delivery platforms, and their degradation is triggered by reactive oxygen species (ROS). Peptides containing more than two consecutive proline residues were found to be cleavable in 1 mM of ROS generated by hydrogen peroxide in the presence of CuSO4, which corresponds to plant cells under photosynthetic conditions. The nanoparticles formed by the peptides were also ROS-degradable and efficiently encapsulated a hydrophobic dye. The hydrophobic cargo in the peptide nanoparticles was released into the cytosol of plant leaf cells in response to the ROS generated in chloroplasts by light irradiation. Furthermore, local laser irradiation enabled the peptide nanoparticles to release their cargo at only the irradiated cell, promising site-selective cargo release triggered by irradiation.
为基于纳米粒子的递送平台设计和开发了含寡脯
氨酸的肽--GP
PG 和 GPP
PG,它们的降解是由活性氧(ROS)引发的。研究发现,含有两个以上连续脯
氨酸残基的肽可在 CuSO4 存在下由
过氧化氢产生的 1 mM ROS 中被裂解,这与光合作用条件下的植物细胞相对应。
多肽形成的纳米颗粒也可被 ROS 降解,并能有效封装疏
水性
染料。
多肽纳米颗粒中的疏
水性
染料在光照射叶绿体产生的 ROS 作用下释放到植物叶片细胞的细胞质中。此外,局部激光照射能使
多肽纳米颗粒只在被照射的细胞中释放货物,从而有望通过照射触发定点选择性货物释放。