Background: Stem cell protein chips can detect stem cell-associated proteins expressed in cells. Methods: We isolated and cultured rabbit peripheral blood mononuclear cells (R-PBMCs) in two bottles, one containing medium and one containing medium with 40% chicken egg white extract. Similarly, 293T cells were also divided into two vials: one vial contained medium and one vial contained medium with 40% chicken egg white extract. After 3 days of culture, proteins were extracted from the cells and used for the stem cell protein chip. Result: Protein chip detection showed that 10 stem cell-associated proteins were increased in the rabbit peripheral blood mononuclear cells induced by chicken egg white extract. There were also 4 stem cell-associated proteins increased in the 293T cells induced by chicken egg white extract. The results of KEGG enrichment analysis indicated that peripheral blood mononuclear cells of rabbits were involved in the regulation of stem cell pluripotency before and after induction. Moreover, 293T cells were involved in the regulation of stem cell pluripotency before and after induction.

Abstract Background The tumorigenesis of infused umbilical cord mesenchymal stem cells (UC-MSCs) is being preclinically evaluated. Methods We observed tumor formation in NOD SCID mice after a single subcutaneous injection of hUC-MSCs and the effect of these cells on tumor growth in tumor-bearing mice. Three generations (P5, P7, and P10) of hUC-MSCs (1 × 107) from two donors (hUC-MSC1 and hUC-MSC2) were inoculated subcutaneously into NOD SCID mice. Subcutaneous transplantation models were established in NOD SCID mice with human cervical cancer HeLa cells (solid tumor) and human B cell lymphoma Raji cells (hematological tumor). Then, the animals were euthanized, gross dissection was performed, and tissues were collected. Various organs were observed microscopically to identify pathological changes and tumor metastasis. Results In the tumorigenesis experiment, no general anatomical abnormalities were observed. In the tumor promotion experiment, some animals in the HeLa groups experienced tumor rupture, and one animal died in each of the low- and medium-dose hUC-MSC groups. The results may have occurred due to the longer feeding time, and the tumor may have caused spontaneous infection and death. Pathological examination revealed no metastasis to distant organs in any group. In the Raji tumor model, some animals in each group experienced tumor rupture, and one animal in the medium-dose hUC-MSC group died, perhaps due to increased tumor malignancy. Thus, hUC-MSCs neither promoted nor inhibited tumor growth. No cancer cell metastasis was observed in the heart, liver, spleen, lungs, kidneys or other important organs, except that pulmonary venule metastasis was observed in 1 animal in the model group. Conclusions Injected hUC-MSCs were not tumorigenic and did not significantly promote or inhibit solid or hematological tumor growth or metastasis in NOD SCID mice.

tRNA源性片段(tRNA-derived fragments,tRFs)和tRNA源性应激诱导RNAs(tRNA-derived stress-induced RNAs,tiRNAs)是tRNAs的衍生片段,属于短的非编码RNA家族,通过转录、翻译、信号通路等途径参与复杂的生物反应.该文旨在验证鸡卵清提取液诱导293T细胞后升高的3个tRFs&tiRNAs分子的细胞功能.将293T细胞加于6孔板中,3个孔加普通培养基,3个孔加50％鸡卵清提取液的培养基,共培养3天.对照组3个样本和诱导组3个样本进行高通量测序检测tRFs&tiRNAs分子在两组中的差异表达.经检测验证诱导后的细胞有3个tRFs&tiRNAs分子稳定升高.这3个分子上调表达有统计学意义.合成这3个分子转染293T细胞,WB检测多能因子OCT4和NANOG的变化,定量PCR检测多能基因OCT4和NANOG的变化和端粒的相对表达量,流式检测多能因子OCT4和NANOG的变化.同时检测这3个分子转染293T细胞后细胞增殖、细胞凋亡和细胞周期的变化情况.结果 表明,3个分子转染293T细胞后,WB检测到多能因子OCT4和NANOG表达对比未转染细胞明显升高,定量PCR检测多能基因OCT4和NANOG相对表达量对比未转染细胞明显升高,端粒对比未转染细胞明显增长.流式检测到多能因子OCT4和NANOG阳性表达细胞对比未转染细胞明显增多.这3个分子转染293T细胞后细胞活性增强,细胞凋亡减少,细胞周期也发生了一定的改变.该研究证明了这3个分子过表达可促进293T细胞多能因子OCT4和NANOG表达升高,促进端粒增长,使细胞年轻化.同时这3个分子过表达可使细胞活性增强,细胞凋亡减少.

Based on the characteristics of modern weapon injury, a repetitive model of traumatic systemic inflammatory response syndrome (SIRS) and an evaluation system were established. The models were treated with GFP-labeled tree shrew umbilical cord mesenchymal stem cells (UCMSCs). Forty out of 50 tree shrews were used to make a unilateral femoral comminuted fracture. Lipopolysaccharide was injected intravenously to create a traumatic SIRS model. The other 10 shrews were used as normal controls. After the model was established for 10 days, 20 tree shrews were injected intravenously with GFP-labeled UCMSCs, and 18 tree shrews were not injected as the model control group. The distribution of GFP-labeled cells in vivo was measured at 2 and 10 days after injection. Twenty days after treatment, the model group, the normal control group, and the treatment group were taken to observe the pathological changes in each tissue, and blood samples were taken for the changes in liver, renal, and heart function. Distribution of GFP-positive cells was observed in all tissues at 2 and 10 days after injection. After treatment, the HE staining results of the treatment group were close to those of the normal group, and the model group had a certain degree of lesions. The results of liver, renal, and heart function tests in the treatment group were returned to normal, and the results in the model group were abnormally increased. UCMSCs have a certain effect on the treatment of traumatic SIRS and provide a new technical solution for modern weapon trauma treatment.