Investigation of the causal relationship between inflammatory bowel disease and type 2 diabetes mellitus: a Mendelian randomization study.

Background: Type 2 diabetes mellitus (T2DM) and inflammatory bowel disease (IBD) have been associated, according to various epidemiological research. This study uses Mendelian randomization (MR) to investigate the causal link between T2DM and IBD. Methods: To investigate the causal relationship between IBD and T2DM risk using European population data from the genome-wide association study (GWAS) summary datasets, we constructed a two-sample MR study to evaluate the genetically predicted impacts of liability towards IBD outcomes on T2DM risk. As instrumental variables (IVs), we chose 26 single nucleotide polymorphisms (SNPs) associated with IBD exposure data. The European T2DM GWAS data was obtained from the IEU OpenGWAS Project database, which contains 298,957 cases as the outcome data. The causal relationship between T2DM and IBD using a reverse MR analysis was also performed. Results: The two-sample MR analysis, with the Bonferroni adjustment for multiple testing, revealed that T2DM risk in Europeans is unaffected by their IBD liability (odds ratio (OR): 0.950-1.066, 95% confidence interval (CI): 0.885-1.019, p = 0.152-0.926). The effects of liability to T2DM on IBD were not supported by the reverse MR analysis either (OR: 0.739-1.131, 95% confidence interval (CI): 0.651-1.100, p = 0.058-0.832). MR analysis of IBS on T2DM also have no significant causal relationship (OR: 0.003-1.007, 95% confidence interval (CI): 1.013-5.791, p = 0.069-0.790). FUMA precisely mapped 22 protein-coding genes utilizing significant SNPs of T2DM acquired from GWAS. Conclusion: The MR study showed that the existing evidence did not support the significant causal effect of IBD on T2DM, nor did it support the causal impact of T2DM on IBD.

Glycemic dispersion: a new index for screening high glycemic variability.

OBJECTIVE: For patients with diabetes, high-frequency and -amplitude glycemic variability may be more harmful than continuous hyperglycemia; however, there is still a lack of screening indicators that can quickly and easily assess the level of glycemic variability. The aim of this study was to investigate whether the glycemic dispersion index is effective for screening high glycemic variability. METHODS: A total of 170 diabetes patients hospitalized in the Sixth Affiliated Hospital of Kunming Medical University were included in this study. After admission, the fasting plasma glucose, 2-hour postprandial plasma glucose, and glycosylated hemoglobin A1c were measured. The peripheral capillary blood glucose was measured seven times in 24 h, before and after each of three meals and before bedtime. The standard deviation of the seven peripheral blood glucose values was calculated, and a standard deviation of > 2.0 was used as the threshold of high glycemic variability. The glycemic dispersion index was calculated and its diagnostic efficacy for high glycemic variability was determined by the Mann-Whitney U test, receiver operating characteristic (ROC) curve and, Pearson correlation analysis. RESULTS: The glycemic dispersion index of patients with high glycemic variability was significantly higher than that of those with low glycemic variability (p < 0.01). The best cutoff value of the glycemic dispersion index for screening high glycemic variability was 4.21. The area under the curve (AUC) was 0.901 (95% CI: 0.856-0.945) and had a sensitivity of 0.781 and specificity of 0.905. It was correlated with the standard deviation of blood glucose values (r = 0.813, p < 0.01). CONCLUSIONS: The glycemic dispersion index had good sensitivity and specificity for screening high glycemic variability. It was significantly associated with the standard deviation of blood glucose concentration and is simple and easy to calculate. It was an effective screening indicator of high glycemic variability.

Comparative study of type 2 diabetes mellitus-associated gut microbiota between the Dai and Han populations.

BACKGROUND: The global prevalence of type 2 diabetes mellitus (T2DM) is increasing. T2DM is associated with alterations of the gut microbiota, which can be affected by age, illness, and genetics. Previous studies revealed that there are discriminating microbiota compositions between the Dai and the Han populations. However, the specific gut microbiota differences between the two populations have not been elucidated. AIM: To compare the gut microbiota differences in subjects with and without T2DM in the Dai and Han populations. METHODS: A total of 35 subjects of the Han population (including 15 healthy children, 8 adult healthy controls, and 12 adult T2DM patients) and 32 subjects of the Dai population (including 10 healthy children, 10 adult healthy controls, and 12 adult T2DM patients) were enrolled in this study. Fasting venous blood samples were collected from all the subjects for biochemical analysis. Fecal samples were collected from all the subjects for DNA extraction and 16S rRNA sequencing, which was followed by analyses of the gut microbiota composition. RESULTS: No significant difference in alpha diversity was observed between healthy children and adults. The diversity of gut microbiota was decreased in T2DM patients compared to the healthy adults in both the Dai and Han populations. There was a significant difference in gut microbiota between healthy children and healthy adults in the Han population with an increased abundance of Bacteroidetes and decreased Firmicutes in children. However, this difference was less in the Dai population. Significant increases in Bacteroidetes in the Han population and Proteobacteria in the Dai population and decreases in Firmicutes in both the Han and Dai population were observed in T2DM patients compared to healthy adults. Linear discriminant analysis Effect Size analysis also showed that the gut microbiota was different between the Han and Dai populations in heathy children, adults, and T2DM patients. Four bacteria were consistently increased and two consistently decreased in the Han population compared to the Dai population. CONCLUSION: Differences in gut microbiota were found between the Han and Dai populations. A significant increase in Bacteroidetes was related to the occurrence of T2DM in the Han population, while a significant increase in Proteobacteria was related to the occurrence of T2DM in the Dai population.

[Organoids derived from the digestive system and their perspective applications in exercise physiology].

Organoid, formed from organ-specific cells, is a group of self-renewal and self-organizing cells growing in a 3-dimensional structure. With the recent progress on microenvironment regulation, stem cell differentiation and organ development, organoids have been constructed and used as promising tools for a wide range of multidisciplinary biomedical applications. Exercise disrupts the internal environment homeostasis, which brings a series of physiological alterations to the digestive system. The current animal or human models are necessary, but not sufficient to monitor the fluctuating microenvironment of gastrointestinal epithelial cells or hepatocytes during exercise. This review described the construction and application of digestive system organoids, as well as the effect of exercise on the microenvironment of intestinal epithelial cells and hepatocytes. The perspective applications of digestive system organoids in exercise physiology were also stated. Using organoid technologies, the possible mechanisms of the exercise-induced dynamic physiological changes would be explored in a new dimension.

Retraction Note: Resveratrol rescues hyperglycemia-induced endothelial dysfunction via activation of Akt.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Efficacy and safety of short-term (≤6 months) duration of dual antiplatelet therapy after drug-eluting stents: a meta-analysis of randomized controlled trials.

OBJECTIVE: Optimal duration of dual antiplatelet therapy (DAPT) after drug-eluting stent (DES) implantation remains controversial. The present study is an assessment of efficacy and safety of short-term (≤6 months) DAPT after DES implantation in patients with coronary artery disease, especially in important subgroups. METHODS: PubMed, Embase, and the Cochrane Central Register of Controlled Trials were searched for randomized, controlled trials comparing short-term and long-term (>6 months) DAPT after DES implantation. Primary efficacy outcome was stent thrombosis (ST). Primary safety outcome was major bleeding. Pooled relative risks (RRs) with 95% confidence interval (CI) were calculated using random- or fixed-effects models as appropriate. RESULTS: Total of 7 trials involving 15870 patients were included in the study. Short-term DAPT significantly reduced major bleeding by 49% compared with long-term DAPT (RR: 0.51; 95% CI: 0.32-0.80; p=0.003) without increasing risk of ST (RR: 1.28; 95% CI: 0.83-1.97; p=0.266). In addition, no differences were observed in all-cause mortality, myocardial infarction (MI), cardiac mortality, or cerebrovascular accidents. Moreover, no significant difference in composite of cardiovascular events, bleeding, and mortality was found in important clinical subgroups. CONCLUSION: Short-term DAPT is associated with lower bleeding risk compared with long-term DAPT. Number of ST and MI was higher with short-term DAPT without reaching statistical significance. Comprehensive clinical judgment is necessary to weigh benefits and risks in the individual patient.

Resveratrol rescues hyperglycemia-induced endothelial dysfunction via activation of Akt.

Resveratrol (RSV), a phytoalexin, has shown to prevent endothelial dysfunction and reduce diabetic vascular complications and the risk of cardiovascular diseases. The aim of this study was to investigate the signaling mechanisms underlying the protecting effects of RSV against endothelial dysfunction during hyperglycemia in vitro and in vivo. Human umbilical vein endothelial cells (HUVECs) were treated with RSV, and then exposed to high glucose (HG, 30 mmol/L). Akt-Ser473 phosphorylation, eNOS-Ser1177 phosphorylation, and PTEN protein levels in the cells were detected using Western blot. For in vivo studies, WT and Akt-/- mice were fed a normal diet containing RSV (400 mg·kg-1·d-1) for 2 weeks, then followed by injection of STZ to induce hyperglycemia (300 mg/dL). Endothelial function was evaluated using aortic rings by assessing ACh-induced vasorelaxation. RSV (5-20 µmol/L) dose-dependently increased Akt-Ser473 phosphorylation, accompanied by increased eNOS-Ser1177 phosphorylation in HUVECs; these effects were more prominent under HG stimulation. Transfection with Akt siRNA abolished RSV-enhanced eNOS phosphorylation and NO release. Furthermore, RSV (5-20 µmol/L) dose-dependently decreased the levels of PTEN, which was significantly increased under HG stimulation, and PTEN overexpression abolished RSV-stimulated Akt phosphorylation in HG-treated HUVECs. Moreover, RSV dramatically increased 26S proteasome activity, which induced degradation of PTEN. In in vivo studies, pretreatment with RSV significantly increased Akt and eNOS phosphorylation in aortic tissues and ACh-induced vasorelaxation, and improved diabetes-induced endothelial dysfunction in wild-type mice but not in Akt-/- mice. RSV attenuates endothelial function during hyperglycemia via activating proteasome-dependent degradation of PTEN, which increases Akt phosphorylation, and consequentially upregulation of eNOS-derived NO production.

[Current developments in exercise immunology].

The aim of this review is to highlight the research and review papers that reflect the current developments in Exercise Immunology, including the interventions on immunosuppression after extreme performance, the effect of exercise on immunosenescence, and the immunomodulating role of exercise in stress and disease. We discuss the papers in accordance with these themes, summarizing their important contributions, and providing directions for future research.

Serum amyloid A stimulates lipoprotein-associated phospholipase A2 expression in vitro and in vivo.

OBJECTIVES: Although lipoprotein-associated phospholipase A2 (Lp-PLA2) has been regarded as a biomarker and a causative agent for acute coronary events recently, the mechanism of the regulation of Lp-PLA2 has not been fully elucidated yet. This study was aimed to investigate the influence of serum amyloid A (SAA) on the expression of Lp-PLA2 in THP-1 cells and ApoE-deficient (ApoE(-/-)) mice. METHODS: THP-1 cells were stimulated by SAA and the mRNA and protein expression of Lp-PLA2 was detected. ApoE(-/-) mice were intravenously injected with murine SAA1 lentivirus. Formyl peptide receptor like-1 (FPRL1) agonist (WKYMVm) and inhibitor (WRW(4)), mitogen-activated protein kinases (MAPKs) inhibitors, and peroxisome proliferator-activated receptor-γ (PPAR-γ) agonist and inhibitor were used to investigate the mechanism of regulation of Lp-PLA2. RESULTS: Recombinant SAA up-regulated Lp-PLA2 expression in a dose and time-dependent manner in THP-1 cells. Immunohistochemical analysis of aortic root of ApoE(-/-) mice also demonstrated that the expression of Lp-PLA2 was up-regulated significantly with SAA treatment. WRW(4) decreased SAA-induced Lp-PLA2 production; while WKYMVm could induce Lp-PLA2 expression. ERK1/2, JNK1/2, and p38 inhibition reduced SAA-induced Lp-PLA2 production. Furthermore, the results suggested the activation of PPAR-γ played a crucial role in this process. CONCLUSION: These results demonstrate that SAA up-regulates Lp-PLA2 production significantly via a FPRL1/MAPKs./PPAR-γ signaling pathway.

Isolation of high quality RNA and construction of a suppression subtractive hybridization library from ramie (Boehmeria nivea L. Gaud.).

Isolation of high quality RNA from ramie (Boehmeria nivea L. Gaud.) is difficult due to its high levels of polyphenols, polysaccharides, pectin, fat, wax and other secondary metabolites. A modified procedure based on guanidinium isothiocyanate for RNA preparation of ramie was developed in this study. High concentrations (5%, v/v) of guanidinium isothiocyanate, PVP-4000, sodium citrate and sodium lauryl sarcosinate and beta-mercaptoethanol were used in the extraction buffer, together with a low pH sodium acetate (pH 4.0) added to improve the RNA quality. The average yield was about 400 microg RNAg(-1) fresh leaves. One SSH library which was induced by ramie anthracnose was constructed by utilizing the RNA extracted through the present method. These results showed that our protocol was applicable for RNA isolation from recalcitrant ramie tissues.