[Progress in omics research and preclinical models of gallbladder cancer].

Gallbladder cancer(GBC)is one common type of bile tract cancers with poor prognosis. This review summarizes the recent development of studies about somatic mutation, molecular subtype, microenvironment heterogeneity, organoid, orthotopic model, patient-derived xenograft and clinical translation on GBC in aspects of genomic,transcriptome,single cell omics and clinical translation. We expect this review will provide new ideas on dissecting molecular mechanisms underlying the development and emerging chemoresistance of GBC following therapy and promote GBC precision medicine.

Role of E3 ubiquitin ligases in insulin resistance.

E3 ubiquitin ligases are a large family of proteins that catalyse the ubiquitination of many proteins for degradation by the 26S proteasome. E3 ubiquitin ligases play pivotal roles in the process of insulin resistance and diabetes. In this review, we summarize the currently available studies to analyse the potential role of E3 ubiquitin ligases in the development of insulin resistance. We propose two mechanisms by which E3 ubiquitin ligases can affect the process of insulin resistance. First, E3 ubiquitin ligases directly degrade the insulin receptor, insulin receptor substrate and other key insulin signalling molecules via the UPS. Second, E3 ubiquitin ligases indirectly regulate insulin signalling by regulating pro-inflammatory mediators that are involved in the regulation of insulin signalling molecules, such as tumour necrosis factor-α, interleukin (IL)-6, IL-4, IL-13, IL-1ß, monocyte chemoattractant protein-1 and hypoxia-inducible factor 1α. Determining the mechanism by which E3 ubiquitin ligases affect the development of insulin resistance can identify a novel strategy to protect against insulin resistance and diabetes.

High-performance liquid chromatographic analysis of resveratrol analog 3,5,4'-trimethoxystilbene in rat plasma.

(E)-3,5,4'-Trimethoxystilbene (BTM-0512), the analog of resveratrol, is potentially useful for the treatment of human diseases. This is the first study to use high-performance liquid chromatography (HPLC) for the determination of the resveratrol analog in rat plasma. Plasma proteins (0.1 mL) were precipitated with acetonitrile after the addition of the internal standard chlorzoxazone. The analysis used a BDS HYPERSIL C(18) analytical column (5 microm, 4.6 x 250 mm) with acetonitrile/water as the mobile phase. The UV-detection wavelength was 303 nm. The calibration curve was linear over the range of 0.025-10 microg/mL with a correlation coefficient of 0.9958. This concentration range corresponds well with the plasma concentrations of BTM-0512 in pharmacokinetic studies. There was a recovery of 102.2%, 95.3% and 103.7% from 0.05, 5 and 10 microg/mL plasma samples, respectively. The relative standard deviation of intra- and interday assay variations was all less than 13%. This HPLC assay is a quick, precise and reliable method for the analysis of BTM-0512 in pharmacokinetic studies.

Therapeutic efficacy of atypical antipsychotic drugs by targeting multiple stress-related metabolic pathways.

Schizophrenia (SZ) is considered to be a multifactorial brain disorder with defects involving many biochemical pathways. Patients with SZ show variable responses to current pharmacological treatments of SZ because of the heterogeneity of this disorder. Stress has a significant role in the pathophysiological pathways and therapeutic responses of SZ. Atypical antipsychotic drugs (AAPDs) can modulate the stress response of the hypothalamic-pituitary-adrenal (HPA) axis and exert therapeutic effects on stress by targeting the prefrontal cortex (PFC) and hippocampus. To evaluate the effects of AAPDs (such as clozapine, risperidone and aripiprazole) on stress, we compared neurochemical profile variations in the PFC and hippocampus between rat models of chronic unpredictable mild stress (CUMS) for HPA axis activation and of long-term dexamethasone exposure (LTDE) for HPA axis inhibition, using an ultraperformance liquid chromatography-mass spectrometry (UPLC-MS/MS)-based metabolomic approach and a multicriteria assessment. We identified a number of stress-induced biomarkers comprising creatine, choline, inosine, hypoxanthine, uric acid, allantoic acid, lysophosphatidylcholines (LysoPCs), phosphatidylethanolamines (PEs), corticosterone and progesterone. Specifically, pathway enrichment and correlation analyses suggested that stress induces oxidative damage by disturbing the creatine-phosphocreatine circuit and purine pathway, leading to excessive membrane breakdown. Moreover, our data suggested that the AAPDs tested partially restore stress-induced deficits by increasing the levels of creatine, progesterone and PEs. Thus, the present findings provide a theoretical basis for the hypothesis that a combined therapy using adenosine triphosphate fuel, antioxidants and omega-3 fatty acids as supplements may have synergistic effects on the therapeutic outcome following AAPD treatment.

[Quantitative analysis of synephrine in zhishi injection by RP-HPLC].

A reversed phase HPLC method was developed for the determination of synephrine in Zhishi Injection using methanol-water (1:1) containing sodium 1-pentane sulfonate (3.5%, G/V) and acetic acid (0.1%, V/V) as the mobile phase with UV detoction at 275nm. Linear response was obtained in the range of 8-64 micrograms/ml (r = 0.9998), the absolute recovery was 96.2-103.4%, and RSD 2.7%-6.0% (n = 7).