Résumé
Inspired by the coordination effects between imidazole and metal ions in hemoglobin, biomimetic nanoparticles were constructed for photodynamic tumor therapy. The photosensitizer of protoporphyrin IX (PpIX) was modified with histidine, which could be self-assembled with Zn2+ to obtain the biomimetic nanoparticles (NPs). Under the conditions of high glutathione and low pH, the biomimetic nanoparticles could be degraded and released for enhanced photodynamic tumor therapy. The structures of NPs were characterized by dynamic light scattering (DLS), UV-visible spectrophotometer (UV-Vis), fluorescence microscope and transmission electron microscope (TEM). The reactive oxygen species (ROS) production ability of NPs was measured by singlet oxygen sensor green (SOSG) test kit. Mouse breast cancer cell lines (4T1 cells) were employed to investigate the subcellular organelle distribution and cytotoxicity of NPs. These results confirmed that NPs possessed a good dispersibility and stability with a uniform structure and particle size at 165 nm. Moreover, MTT assay and live/dead cell staining assay demonstrated that NPs could inhibit the proliferation of 4T1 cells and exhibit a good biocompatability. This research would promote the construction of intelligent biomedicine for tumor precision therapy.
Résumé
Lamin A/C is I he main component of nuclear lamina, ami its important role of cpigenetie pharmacology in si em cells has been recognizcd in recent years, lmin A/C hus been reported to maintain the nuclear homeostasis, protect the chromatin, anil act as a reactor for mcchanical stimulation of the nucleus to transmit mechanical signals. Besides, Lamin A/C has been discovered to participate directly or indirectly in the transcriptional regulation of the genes. This article aims to review the regulation of Lamin A/C in stem cells by mechanical signals of microenvi- ronment, and live effect of Lamin A/C on chromosome modification and genes regulation.