Department of Nano-regenerative Medical Engineering, College of Life Science, CHA University, 6F, CHA Biocomplex, Sampyeong-Dong, Bundang-gu, Seongnam-si, 13488, Republic of Korea.
Department of Nano-regenerative Medical Engineering, College of Life Science, CHA University, 6F, CHA Biocomplex, Sampyeong-Dong, Bundang-gu, Seongnam-si, 13488, Republic of Korea.
Biomaterials. 2018 Sep;177:1-13. doi: 10.1016/j.biomaterials.2018.05.035. Epub 2018 May 29.
Overexpression and knockdown of specific proteins can control stem cell differentiation for therapeutic purposes. In this study, we fabricated RUNX2, SOX9, and C/EBPα plasmid DNAs (pDNAs) and ATF4-targeting shRNA (shATF4) to induce osteogenesis, chondrogenesis, and adipogenesis of human mesenchymal stem cells (hMSCs). The pDNAs and shATF4 were complexed with TRITC-gene regulation nanoparticles (GRN). Osteogenesis-related gene expression was reduced at early (12 h) and late (36 h) time points after co-delivery of shATF4 and SOX9 or C/EBPα pDNA, respectively, and osteogenesis was inhibited in these hMSCs. By contrast, osteogenesis-related genes were highly expressed upon co-delivery of RUNX2 and ATF4 pDNAs. DEX in GRN enhanced chondrogenic differentiation. Expression of osteogenesis-, chondrogenesis-, and adipogenesis-related genes was higher in hMSCs transfected with NPs complexed with RUNX2 and ATF4 pDNAs, shATF4 and SOX9 pDNA, and shATF4 and C/EBPα pDNA for 72 h than in control hMSCs, respectively. Moreover, delivery of these NPs also increased expression of osteogenesis-, chondrogenesis-, and adipogenesis-related proteins. These alterations in expression led to morphological changes, indicating that hMSCs differentiated into osteoblasts, chondrocytes, and adipose cells.
过表达和敲低特定蛋白质可以控制干细胞分化,以达到治疗目的。在这项研究中,我们构建了 RUNX2、SOX9 和 C/EBPα 质粒 DNA(pDNA)和 ATF4 靶向 shRNA(shATF4),以诱导人间充质干细胞(hMSC)的成骨、成软骨和成脂分化。pDNA 和 shATF4 与 TRITC-基因调控纳米颗粒(GRN)复合。在共递送 shATF4 和 SOX9 或 C/EBPα pDNA 后,分别在早期(12 h)和晚期(36 h)时间点,成骨相关基因表达降低,这些 hMSC 中的成骨作用受到抑制。相比之下,共递送 RUNX2 和 ATF4 pDNA 时,成骨相关基因高度表达。DEX 在 GRN 中增强了软骨分化。在转染了与 RUNX2 和 ATF4 pDNA、shATF4 和 SOX9 pDNA 以及 shATF4 和 C/EBPα pDNA 复合的 NPs 的 hMSC 中,成骨、成软骨和成脂相关基因的表达在 72 h 时高于对照组 hMSC,分别。此外,这些 NPs 的递送还增加了成骨、成软骨和成脂相关蛋白的表达。这些表达的改变导致形态变化,表明 hMSC 分化为成骨细胞、软骨细胞和脂肪细胞。
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