Ameliorative Effect of miR-31 on Liver Injury in Type 2 Diabetic Mice / 中国生物化学与分子生物学报

Type 2 diabetes mellitus (T2DM) is a metabolic disease with an increasing incidence worldwide, which leads to damage to various tissues and organs including the liver. MiR-31 is conserved across species and closely associated with metabolic diseases, but its role in type 2 diabetic liver injury has not been elucidated. This study aimed to investigate the effect of miR-31 on liver injury in type 2 diabetes and its underlying mechanism. Four to six weeks old male FVB mice and miR-31-positive transgenic mice were randomly divided into FVB mice control group (C), FVB mice induced diabetes group (DM) and miR-31-overexpression transgenic mice induced diabetes group (31DM). After 1 week of adaptive feeding, the T2DM mouse model was induced by high-fat feeding combined with intraperitoneal injection of streptozotocin (STZ) for 6 weeks. The general condition of mice and related metabolic indicators showed that the increased food and water intake, weight loss and glucose and lipid metabolism disorders could be reversed by miR-31 in T2DM mice. HE staining and liver histological activity index (HAI) scoring results showed that miR-31 improved the inflammatory status in the liver tissue of T2DM mice and decreased the HAI score. RT-qPCR results showed that the high expression of miR-31 was accompanied by a decrease in the expression of activating transcription factor 6 (ATF6) mRNA in the liver of T2DM mice. Furthermore, Western blotting results showed that miR-31 inhibited the expression of endoplasmic reticulum stress-related proteins such as ATF6, glucoregulatory protein 78 (GRP78) and C/EBP homologous protein (CHOP) in the liver of T2DM mice. In conclusion, miR-31 may ameliorate liver injury in T2DM mice by regulating glucose and lipid metabolism disorders and insulin resistance, and inhibiting endoplasmic reticulum stress factors such as ATF6, GRP78, and CHOP.

Improving effect of human umbilical cord mesenchymal stem cell transplantation on depression behavior in chronic stress model mice / 解剖学报

Objective To study the effect of human umbilical cord mesenchymal stem cells (hUCMSCs) tail vein transplantation on depressive behavior in chronic unpredictable mild stress (CUMS) model mice. Methods The third generation hUCMSCs were abtained; Sixty C57BL/6 male mice were randomly divided into the normal model group (+ normal saline), the cell group (+hUCMSCs) and the fluoxetine(flu) group (+flu), with 15 mice in each group. The depression model of CUMS mice with a 6 week duration was constructed; From the third week, hUCMSCs and normal saline were transplanted into the mice by tail vein injection, and the mice were gavaged with flu daily from the fifth week; Weight changes in each group were recorded weekly; The depression model and therapeutic effect of mice were evaluated by sucrose preference test, tail suspension test, forced swimming test and open field test; The cell changes of CAI and CA3 region in hippocampus were observed by HE staining; Transmission electron microscopy was used to detect the changes of synapses in CA3 region of hippocampus; Real-time PCR was used to detect mRNA expressions of synaphysin (SYP) and postsynaptic density protein 95 (PSD-95), which are key proteins of synaptic plasticity. Results hUCMSCs improved weight decrease in depressed mice; behavioral experiments observed that the model group mice showed depressive behavior, while the cell group and the drug group mice depression were improved; HE staining showed that, compared with the model group, cells in CA 1 and CA3 regions of the hippocampus of mice in the cell group and the group were arranged orderly and the number of cells increased; Transmission electron microscopy showed that compared with the model group, the number of synapses in the CA3 region of the hippocampus was more, the synaptic gap was narrower, and the density of synaptic spines was higher in the cell group and the drug group; More mRNA expressions of SYP and PSD-95 were detected by Real-time PCR in the cell group and the drug group than in the model group. Conclusion hUCMSCs transplatation showes antidepressant effects, which are associated with improved synaptic plasticity in the hippocampus.

Inhibition of NHE1 down-regulates IL-8 expression and enhances p38 phosphorylation / 中国实验血液学杂志

This study was purposed to explore the changes of possible angiogenetic factors other than VEGF after inhibition of NHE1 and their related mechanisms. The K562 cells were treated by NHE1 specific inhibitor cariporide, the angiogenesis factors after inhibition of NHE1 were screened by using protein chip, the IL-8 expression level after cariporide treatment was detected by real-time quantitative PCR; the K562 cells with stable interference of NHE1 were constructed, the IL-8 expression level after interference of NHE1 was detected by real-time quantitative PCR; the p38 phosphorylation level in K562 cells treated with cariporide was detected by Western blot. After treatment of K562 cells with p38 inhibitor SB203580, the IL-8 expression level was decreased by real-time quantitative PCR. The results of protein chip showed that IL-8 expression decreased after cariporide treatment. Real-time quantitative PCR confirmed this inhibitory effect. The p38 phosphorylation level increased after cariporide treatment. The down-regulation of IL-8 expression induced by cariporide treatment was partially restored after K562 cells were treated with p38 inhibitor SB203580. It is concluded that the inhibition of NHE1 can inhibit IL-8 expression through up-regulation of p38 phosphorylation.

Effect of DOT1L gene silence on proliferation of acute monocytic leukemia cell line THP-1 / 中国实验血液学杂志

This study was aimed to investigate the influence of short hairpin RNA (shRNA) on proliferation of human leukemia cell line THP-1. The shRNA targeting the site 732-752 of DOT1L mRNA was designed and chemically synthesized, then a single-vector lentiviral, tet-inducible shRNA-DOT1L system (Plko-Tet-On) was generated. Thereafter, the THP-1 cells with lentivirus were infected to create stable cell line with regulatable shRNA expression. The expression of DOT1L in the THP-1 cell line was assayed by RT-PCR. Effect of shRNA-DOT1L on the proliferation of THP-1 cells was detected with MTT method,and the change of colony forming potential of THP-1 cells was analyzed by colony forming unit test. Cell cycle distribution was tested by flow cytometry. The results indicated that the expression of DOT1L was statistically lower than that in the control groups. The proliferation and colony forming capacity of THP-1 cells were significantly inhibited. The percentage of cells at G0/G1 phase increased in THP-1/shRNA cells treated with Dox while the percentage of cells at S phase significantly decreased as compared with that in the control group. It is concluded that the shRNA targeting DOT1L can effectively inhibit the proliferation of acute monocytic leukemia cell line THP-1.

Prevalence of astigmatism in 2023 children with amblyopia / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To investigate the prevalence, type and distribution of astigmatism in children with amblyopia.</p><p><b>METHODS</b>A total of 2023 children with amblyopia (aged 4-11 years, 3657 eyes) were recruited. The prevalence of astigmatism was investigated.</p><p><b>RESULTS</b>Of the 3657 amblyopic eyes, 91.9% presented astigmatism (≥0.5 D). The proportion of eyes with astigmatism decreased with the increasing age. Compound hyperopic astigmatism was the most common type of astigmatism (38.8%) and its prevalence increased with the increasing age in children with amblyopia. Astigmatism with the rule was the most common (90.1%) in the axial distribution test. There were statistical significances in the axial distribution of astigmatism in different age groups. Statistical significances were also found in the degree, type and axis of astigmatism among the children with mild, moderate and severe amblyopia (P<0.05).</p><p><b>CONCLUSIONS</b>The prevalence of astigmatism in children with amblyopia is high but is reduced with age. The age and the degree of amblyopia might be influential factors in the distribution of astigmatism.</p>

Therapeutic Effects of Atomoxetine on Children with Attention Deficit Hyperactivity Disorder Comorbid Tic Disorder / 实用儿科临床杂志

Objective To explore the clinical effect of atomoxetine on children with attention deficit hyperactivity disorder(ADHD)comorbid tic disorder.Methods The children who met the criteria of Mental Disorders Diagnostic and Statistical Manual diagnostic criteria for ADHD and tic symptoms were given systematic atomoxetine titration reaching the optimum dose.ADHD and tic symptoms were evaluated with ADHD rating scale-Ⅳ(ADHD-RS-Ⅳ)for parents Yale Global Tic Severity Scale(YGTSS),respectively.Results Twenty children with ADHD comorbid tic disorder [17 male,3 female;age range 7.58-17.0 years,mean age(10.55?2.58)years] completing systemic titration was enrolled in the study,including 10 subjects with ADHD-inattentive type,9 mixed type,and 1 hyperactive/impulsive type.The mean optimal dose was(1.19?0.21)mg/(kg?d).The total score(12.65?9.08)scores,inattention score(7.45?4.75)scores and hyperactivity/impulsivity score(3.0)of ADHD-RS-Ⅳ decreased significantly post-treatment compared with pro-treatment(31.10?8.52,17.60?3.09,and 13.0 scores,respectively,P