MicroRNA-146a deficiency delays wound healing in normal and diabetic mice

OBJECTIVE: MiRNAs are important regulators of inflammation and wound healing. However, the mechanisms through which miRNAs regulate wound healing under normal and diabetic conditions are poorly understood. We aimed to determine the effects of miR-146a on the pathogenesis of wound healing in normal and streptozotocin (STZ)-induced diabetic mice. APPROACH: Wild-type (WT) and miR-146a knockout (KO) mice were induced to develop diabetes with STZ. Next, skin and corneal wounds were produced and measured. Percent wound closure and histology were evaluated. Inflammation at wound sites was analyzed using flow cytometry, RT-PCR, and Western blot. RESULTS: Healing of wounded skin was significantly delayed in miR-146a KO compared to WT mice. However, corneal epithelial wound healing did not differ significantly in the mice with normal blood glucose, whereas corneal and skin wound healing was significantly delayed in KO mice with diabetes. Neutrophil infiltration increased in skin wounds of KO compared with normal mice. The potential mechanisms were associated with dysregulated IL-1β, TNF-α, IRAK1, TRAF6, and NF-κB signaling induced by miR-146a KO. INNOVATION: Skin wound healing was delayed in miR-146a KO mice and enhanced inflammatory responses were mediated by the NF-κB signaling pathway. CONCLUSIONS: Deficiency in miR-146a delayed skin wound healing by enhancing inflammatory responses in normal and diabetic mice. Therefore, miR-146a may be a potential target for modulation to accelerate skin wound healing

Effect of graphite addition on microstructure and properties of TiC–Ti5Si3–SiC composite coatings reacted from Ti–SiC-graphite powders

A TiC–Ti5Si3–SiC composite coating was prepared using atmospheric plasma spraying by in-situ reaction of raw agglomerated Ti–SiC-graphite powders. The effect of graphite content on the reaction mechanism, microstructure, and properties of plasma sprayed TiC–Ti5Si3–SiC coatings was studied. The results indicated that, with the increase of graphite content, Ti and C preferentially reacted and the reaction feasibility between Ti and SiC reduced. The content of TiC in the reaction products and unreacted SiC increased, while the content of Ti5Si3 decreased. Among them, the TiC–Ti5Si3–SiC coating prepared using Ti–SiC-graphite powders with a molar ratio of 3:1:1 exhibits excellent comprehensive properties, dense microstructure (porosity: 11.76 %), highest hardness (1132 HV0.2), high bonding strength (scratch critical load: ∼44 N), and optimal wear resistance with a wear loss weight of ∼5 × 10 −4 g

Molecular cloning, sequence characteristics, and tissue expression analysis of glucagon receptor gene in Bama minipig

Recent studies have shown that the glucagon receptor (GCGR) plays an important role in the development of type 2 diabetes mellitus. Both pigs and humans exhibit significantly similar behaviors in their glucose and lipid metabolism. In this study, the obtained Bama minipig GCGR coding sequence was 1437 bp encoding 479 amino acids (AA), which demonstrated higher sequence homology with humans than other species. It showed the highest expression profile in the liver, followed by the lung and kidney. In addition, the three-dimensional structure analysis showed that the porcine GCGR protein also had a classic sevenfold transmembrane region and a stalk region at the N-terminus for ligand binding. The stalk region of GCGR possessed five AA variations. The ligand binding pocket of GCGR has one AA variation in the key region, none of which affected the glucagon binding verified by the crystal structure mutagenesis in humans. There was no variation found in the region of membrane anchoring, hydrophobic bond, salt bridge, and hydrogen bond. However, the Gly40Ser mutation in mice resulted in major diseases, meaning that pigs are more suitable for the evaluation of GCGR-related drugs than mice.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

Cellular Membrane Microparticles: Potential Targets of Combinational Therapy for Vascular Disease

Vascular disease constitutes the leading health problem throughout the entire world. Current therapies for vascular disease mainly rely on comprehensive strategies including control of risk factors, vascular interventions and conventional supportive treatments. To improve the preventive and therapeutic efficacies of current approaches, novel combinational therapies are required. Microparticles (MPs) are small membrane vesicles derived from cells undergoing stress, activation or apoptosis. They carry the characteristics of their parent cells, which enabling them to serve as potential biomarkers for various diseases. Of note, MPs also have been shown to mediate cell communications through transferring membrane proteins, phospholipids and RNAs from their parent cells to recipient cells. Recent novel approaches have started to reveal the functions of MPs. In this review, we summarize the general concepts and the latest research progress in MPs. And the potential of MPs as novel targets of combinational therapy for vascular disease will be discussed

Cellular Membrane Microparticles: Potential Targets of Combinational Therapy for Vascular Disease

Vascular disease constitutes the leading health problem throughout the entire world. Current therapies for vascular disease mainly rely on comprehensive strategies including control of risk factors, vascular interventions and conventional supportive treatments. To improve the preventive and therapeutic efficacies of current approaches, novel combinational therapies are required. Microparticles (MPs) are small membrane vesicles derived from cells undergoing stress, activation or apoptosis. They carry the characteristics of their parent cells, which enabling them to serve as potential biomarkers for various diseases. Of note, MPs also have been shown to mediate cell communications through transferring membrane proteins, phospholipids and RNAs from their parent cells to recipient cells. Recent novel approaches have started to reveal the functions of MPs. In this review, we summarize the general concepts and the latest research progress in MPs. And the potential of MPs as novel targets of combinational therapy for vascular disease will be discussed

二甲双胍日剂量和治疗时间对中国2型糖尿病患者维生素B12缺乏和周围神经病变患病率的影响:一项多中心横断面研究

Abstract Aims To evaluate the prevalence of vitamin B12 deficiency in Chinese patients with type 2 diabetes mellitus receiving metformin treatment and to investigate the effects of metformin daily dose and treatment duration on the prevalence of vitamin B12 deficiency and peripheral neuropathy (PN). Materials and Methods In this multicenter cross‐sectional study, 1027 Chinese patients who had been taking ≥1000 mg/day metformin for ≥1 year were enrolled using proportionate stratified random sampling based on daily dose and treatment duration. Primary measures included the prevalence of vitamin B12 deficiency (<148 pmol/L), borderline B12 deficiency (148 pmol/L‐211 pmol/L), and PN. Results The prevalence of vitamin B12 deficiency, borderline deficiency, and PN were 2.15%, 13.66%, and 11.59%, respectively. Patients receiving ≥1500 mg/day metformin had significantly higher prevalence of borderline vitamin B12 deficiency (16.76% vs. 9.91%, p = .0015) and serum B12 ≤221 pmol/L (19.25% vs. 11.64%, p < .001) than patients receiving <1500 mg/day metformin. No difference was found in prevalence of borderline vitamin B12 deficiency (12.58% vs. 15.49%, p = .1902) and serum B12 ≤221 pmol/L (14.91% vs. 17.32%, p = .3055) between patients receiving metformin for ≥3 and <3 years. Patients with vitamin B12 deficiency had numerically higher PN prevalence (18.18% vs. 11.27%, p = .3192) than patients without it. Multiple logistic analyses revealed that HbA1c and metformin daily dose were associated with the prevalence of borderline B12 deficiency and B12 ≤221 pmol/L. Conclusions High daily dosage (≥1500 mg/day) played an important role in metformin‐associated vitamin B12 deficiency while not contributing to the risk of PN

UTX condensation underlies its tumour-suppressive activity

UTX (also known as KDM6A) encodes a histone H3K27 demethylase and is an important tumour suppressor that is frequently mutated in human cancers1. However, as the demethylase activity of UTX is often dispensable for mediating tumour suppression and developmental regulation2-8, the underlying molecular activity of UTX remains unknown. Here we show that phase separation of UTX underlies its chromatin-regulatory activity in tumour suppression. A core intrinsically disordered region (cIDR) of UTX forms phase-separated liquid condensates, and cIDR loss caused by the most frequent cancer mutation of UTX is mainly responsible for abolishing tumour suppression. Deletion, mutagenesis and replacement assays of the intrinsically disordered region demonstrate a critical role of UTX condensation in tumour suppression and embryonic stem cell differentiation. As shown by reconstitution in vitro and engineered systems in cells, UTX recruits the histone methyltransferase MLL4 (also known as KMT2D) to the same condensates and enriches the H3K4 methylation activity of MLL4. Moreover, UTX regulates genome-wide histone modifications and high-order chromatin interactions in a condensation-dependent manner. We also found that UTY, the Y chromosome homologue of UTX with weaker tumour-suppressive activity, forms condensates with reduced molecular dynamics. These studies demonstrate a crucial biological function of liquid condensates with proper material states in enabling the tumour-suppressive activity of a chromatin regulator