Bavachin protects against diet-induced hepatic steatosis and obesity in mice.

Non-alcoholic fatty liver disease (NAFLD) is a major health concern worldwide, and the incidence of metabolic disorders associated with NAFLD is rapidly increasing because of the obesity epidemic. There are currently no approved drugs that prevent or treat NAFLD. Recent evidence shows that bavachin, a flavonoid isolated from the seeds and fruits of Psoralea corylifolia L., increases the transcriptional activity of PPARγ and insulin sensitivity during preadipocyte differentiation, but the effect of bavachin on glucose and lipid metabolism remains unclear. In the current study we investigated the effects of bavachin on obesity-associated NAFLD in vivo and in vitro. In mouse primary hepatocytes and Huh7 cells, treatment with bavachin (20 µM) significantly suppressed PA/OA or high glucose/high insulin-induced increases in the expression of fatty acid synthesis-related genes and the number and size of lipid droplets. Furthermore, bavachin treatment markedly elevated the phosphorylation levels of AKT and GSK-3ß, improving the insulin signaling activity in the cells. In HFD-induced obese mice, administration of bavachin (30 mg/kg, i.p. every other day for 8 weeks) efficiently attenuated the increases in body weight, liver weight, blood glucose, and liver and serum triglyceride contents. Moreover, bavachin administration significantly alleviated hepatic inflammation and ameliorated HFD-induced glucose intolerance and insulin resistance. We demonstrated that bavachin protected against HFD-induced obesity by inducing fat thermogenesis and browning subcutaneous white adipose tissue (subWAT). We revealed that bavachin repressed the expression of lipid synthesis genes in the liver of obese mice, while promoting the expression of thermogenesis, browning, and mitochondrial respiration-related genes in subWAT and brown adipose tissue (BAT) in the mice. In conclusion, bavachin attenuates hepatic steatosis and obesity by repressing de novo lipogenesis, inducing fat thermogenesis and browning subWAT, suggesting that bavachin is a potential drug for NAFLD therapy.

Associations of combined healthy lifestyles with cancer morbidity and mortality among individuals with diabetes: results from five cohort studies in the USA, the UK and China.

AIMS/HYPOTHESIS: Cancer has contributed to an increasing proportion of diabetes-related deaths, while lifestyle management is the cornerstone of both diabetes care and cancer prevention. We aimed to evaluate the associations of combined healthy lifestyles with total and site-specific cancer risks among individuals with diabetes. METHODS: We included 92,239 individuals with diabetes but without cancer at baseline from five population-based cohorts in the USA (National Health and Nutrition Examination Survey and National Institutes of Health [NIH]-AARP Diet and Health Study), the UK (UK Biobank study) and China (Dongfeng-Tongji cohort and Kailuan study). Healthy lifestyle scores (range 0-5) were constructed based on current nonsmoking, low-to-moderate alcohol drinking, adequate physical activity, healthy diet and optimal bodyweight. Cox regressions were used to calculate HRs for cancer morbidity and mortality, adjusting for sociodemographic, medical and diabetes-related factors. RESULTS: During 376,354 person-years of follow-up from UK Biobank and the two Chinese cohorts, 3229 incident cancer cases were documented, and 6682 cancer deaths were documented during 1,089,987 person-years of follow-up in the five cohorts. The pooled multivariable-adjusted HRs (95% CIs) comparing participants with 4-5 vs 0-1 healthy lifestyle factors were 0.73 (0.61, 0.88) for incident cancer and 0.55 (0.46, 0.67) for cancer mortality, and ranged between 0.41 and 0.63 for oesophagus, lung, liver, colorectum, breast and kidney cancers. Findings remained consistent across different cohorts and subgroups. CONCLUSIONS/INTERPRETATION: This international cohort study found that adherence to combined healthy lifestyles was associated with lower risks of total cancer morbidity and mortality as well as several subtypes (oesophagus, lung, liver, colorectum, breast and kidney cancers) among individuals with diabetes.

The prevalence of hypophosphatemia and refeeding-related hypophosphatemia in hospitalized patients requiring parental nutrition: a retrospective study.

OBJECTIVE: Hypophosphatemia might cause respiratory and heart failure and even death. We aimed to evaluate risk factors for hypophosphatemia and refeeding-related hypophosphatemia in patients requiring parental nutrition (PN). METHODS: This was a single-center, retrospective study. Clinical parameters were obtained from medical records. Serum phosphate (inorganic phosphorus) was measured by photometric analysis. Hypophosphatemia was confirmed when serum phosphate level was less than 0.8 mmol/L (≈2.5 mg/dl). Refeeding related hypophosphatemia was confirmed if serum phosphate level had a decrease of 0.16 mmol/L or more from baseline and if the final assessment was below 0.65 mmol/L. RESULTS: A total number of 655 (426 men and 229 women, aged 62.8 ± 14.8 years) hospitalized patients requiring PN were included in the study, and 60.6% of them were patients with cancer. The average body mass index (BMI) was 21.1 ± 4.1 kg/m2 and the median of serum phosphate was 0.9 mmol/L (quartile range: 0.68 mmol/L, 1.11 mmol/L). The prevalence of hypophosphatemia was 37.6% (246/655). Older age (≥ 65 years vs. < 65 years), lower serum level of pre-albumin (< 160 mg/L vs. ≥ 160 mg/L), calcium (< 2.11 mmol/L vs. ≥ 2.11 mmol/L), and magnesium (< 0.75 mmol/L vs. ≥ 0.75 mmol/L) were associated with high risk of hypophosphatemia by multivariate logistic regression (OR ranged from 1.43 to 3.06, all p < 0.05). Refeeding related hypophosphatemia was 9.5% (16/168). Serum level of calcium at baseline was significantly lower in participants with refeeding related hypophosphatemia than those without it. Total calorie and nitrogen delivered during first week of PN period showed no obvious difference between patients with and without refeeding related hypophosphatemia. CONCLUSIONS: Hypophosphatemia is common (37.6%) in hospitalized patients requiring PN. Monitoring of serum level of phosphorus is necessary to facilitate early treatment of hypophosphatemia.

Targeted Mitochondrial Epigenetics: A New Direction in Alzheimer's Disease Treatment.

Mitochondrial epigenetic alterations are closely related to Alzheimer's disease (AD), which is described in this review. Reports of the alteration of mitochondrial DNA (mtDNA) methylation in AD demonstrate that the disruption of the dynamic balance of mtDNA methylation and demethylation leads to damage to the mitochondrial electron transport chain and the obstruction of mitochondrial biogenesis, which is the most studied mitochondrial epigenetic change. Mitochondrial noncoding RNA modifications and the post-translational modification of mitochondrial nucleoproteins have been observed in neurodegenerative diseases and related diseases that increase the risk of AD. Although there are still relatively few mitochondrial noncoding RNA modifications and mitochondrial nuclear protein post-translational modifications reported in AD, we have reason to believe that these mitochondrial epigenetic modifications also play an important role in the AD process. This review provides a new research direction for the AD mechanism, starting from mitochondrial epigenetics. Further, this review summarizes therapeutic approaches to targeted mitochondrial epigenetics, which is the first systematic summary of therapeutic approaches in the field, including folic acid supplementation, mitochondrial-targeting antioxidants, and targeted ubiquitin-specific proteases, providing a reference for therapeutic targets for AD.

lncRNA RHPN1-AS1 promotes the progression of endometrial cancer through the activation of ERK/MAPK pathway.

AIM: This study aimed to investigate the function of long noncoding RNA RHPN1 antisense RNA 1 (lncRNA RHPN1-AS1) in the progression of endometrial cancer (EC) and its underlying molecular mechanisms. METHODS: The RHPN1-AS1 expression was measured by quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) in EC tissues and cells. The cell clones, proliferation, cell cycle, apoptosis, migration and invasion in Ishikawa and HEC-1A cells were respectively measured by colony formation assay, cell counting kit-8 assay (CCK-8) assay, flow cytometry, wound healing assay and transwell assay. In addition, the protein expressions in Ishikawa and HEC-1A cells were measured using western blot and Immunofluorescence assay. RESULTS: Our data showed the RHPN1-AS1 expression was significantly upregulated in both EC tissues and cells. The expression of RHPN1-AS1 was significantly correlated with FIGO stage, histological grade, and lymph node metastasis. Additionally, silencing RHPN1-AS1 could inhibit proliferation, cell cycle progression, migration and invasion, and also promote apoptosis in Ishikawa and HEC-1A cells. Moreover, silencing RHPN1-AS1 could markedly elevate the expressions of caspase-3 and Bax, but reduce the Bcl-2 expression in Ishikawa and HEC-1A cells. We also found that silencing RHPN1-AS1 could significantly inhibit the phosphorylation of MEK and ERK in Ishikawa and HEC-1A cells. After U0126 pretreatment, the inhibition effect of silencing RHPN1-AS1 on the phosphorylation of MEK and ERK was strengthened. CONCLUSION: Our study demonstrated that RHPN1-AS1 could facilitate cell proliferation, migration and invasion, as well as inhibit apoptosis via activating ERK/MAPK pathway in EC.

Synergistic Effect between Zr-MOF and Phosphomolybdic Acid with the Promotion of TiF4 Template.

Metal-Organic Framework (MOF) materials are often modified or functionalized, and then the crystal size and morphology of MOF materials are changed. In the process of preparing UiO-66 confined phosphomolybdic acid (PMA) composites (PU), the TiF4-modified PU (PMA + UiO-66) composite catalyst (TiF4-PU) was successfully synthesized by adding titanium tetrafluoride, and the catalytic desulfurization activity was excellent. Similarly, the reaction mechanism was investigated by means of infrared spectroscopy, Raman spectroscopy, XPS, and UV/Vis spectroscopy. The results show that the addition of TiF4 not only changes the appearance and color of the catalyst, but also changes the valence distribution of the elements in the catalyst. The number of oxygen vacancies in the MOF increases due to the addition of TiF4, and more electrons are transferred from the Zr-MOF to PMA to form more Mo5+, which improved the performance of oxidative desulfurization in comparison. Thus, a stronger strong metal-support interaction (SMSI) effect is observed for TiF4-modified PU catalysts. In addition, the quenching experiment of free radicals shows that ·OH radical is the main active substance in the oxidative desulfurization reaction over TiF4-PU catalyst.

Trichothecin Inhibits Cancer-Related Features in Colorectal Cancer Development by Targeting STAT3.

Signal transducer and activator of transcription 3 (STAT3) is a transcription factor that contributes to cancer progression through multiple processes of cancer development, which makes it an attractive target for cancer therapy. The IL-6/STAT3 pathway is associated with an advanced stage in colorectal cancer patients. In this study, we identified trichothecin (TCN) as a novel STAT3 inhibitor. TCN was found to bind to the SH2 domain of STAT3 and inhibit STAT3 activation and dimerization, thereby blocking STAT3 nuclear translocation and transcriptional activity. TCN did not affect phosphorylation levels of STAT1. TCN significantly inhibited cell growth, arrested cell cycle at the G0/G1 phase, and induced apoptosis in HCT 116 cells. In addition, the capacities of colony formation, migration, and invasion of HCT 116 cells were impaired upon exposure to TCN with or without IL-6 stimulation. In addition, TCN treatment abolished the tube formation of HUVEC cells in vitro. Taken together, these results highlight that TCN inhibits various cancer-related features in colorectal cancer development in vitro by targeting STAT3, indicating that TCN is a promising STAT3 inhibitor that deserves further exploration in the future.

[Role of microRNA-17-5p in the pathogenesis of pediatric nephrotic syndrome and related mechanisms].

OBJECTIVE: To study the role of microRNA-17-5p (miR-17-5p) in the pathogenesis of pediatric nephrotic syndrome (NS) and its effect on renal podocyte apoptosis via the activin A (ActA)/Smads pathway. METHODS: An analysis was performed on 55 children with NS (NS group) who were admitted from March 2018 to March 2019. Fifty healthy children who underwent physical examination during the same period of time were enrolled as the control group. The mRNA expression of miR-17-5p in peripheral blood was measured and compared between the two groups. Human renal podocytes were transfected with antisense oligonucleotide recombinant plasmid containing miR-17-5p (inhibition group) or control vector containing nonsense random sequence (negative control group), and untreated human renal podocytes were used as the blank group. These groups were compared in terms of cell apoptosis and the mRNA and protein expression of miR-17-5p, ActA, and Smads after transfection. RESULTS: The NS group had a significantly higher level of miR-17-5p in peripheral blood than the control group (P<0.001). Compared with the blank and negative control groups, the inhibition group had significantly lower apoptosis rate and relative mRNA expression of miR-17-5p and significantly higher relative mRNA and protein expression of ActA, Smad2, and Smad3 (P<0.001). CONCLUSIONS: There is an increase in the content of miR-17-5p in peripheral blood in children with NS. Low expression of miR-17-5p can inhibit the apoptosis of human renal podocytes, which may be associated with the upregulation of the mRNA and protein expression of ActA, Smad2 and Smad3.

A Pairwise Meta-Analysis of Induction Chemotherapy in Nasopharyngeal Carcinoma.

BACKGROUND: Locoregionally advanced nasopharyngeal carcinoma has high risk of distant metastasis and mortality. Induction chemotherapy is commonly administrated in clinical practice, but the efficacy was quite controversial in and out of randomized controlled trials. We thus conducted this pairwise meta-analysis. MATERIALS AND METHODS: Trials that randomized patients to receive radiotherapy or concurrent chemoradiotherapy with or without induction chemotherapy were identified via searches of PubMed, MEDLINE, and ClinicalTrials.gov. RESULTS: A total of ten trials (2,627 patients) were included. The pooled hazard ratios (HRs) based on fixed effect model were 0.68 (95% confidence interval [CI] 0.56-0.80, p < .001) for overall survival (OS) and 0.70 (95% CI 0.61-0.79, p < .001) for progression-free survival (PFS), which strongly favored the addition of induction chemotherapy. The absolute 5-year survival benefits were 8.47% in OS and 10.27% in PFS, respectively. In addition, based on the available data of eight trials, induction chemotherapy showed significant efficacy in reducing locoregional failure rate (risk ratio [RR] = 0.81, 95% CI 0.68-0.96, p = .017) and distant metastasis rate (RR = 0.69, 95% CI 0.58-0.82, p < .001). CONCLUSION: This pairwise meta-analysis confirms the benefit in OS, PFS, and locoregional and distant controls associated with the addition of induction chemotherapy in nasopharyngeal carcinoma. IMPLICATIONS FOR PRACTICE: According to the results of this meta-analysis of ten trials, induction chemotherapy can prolong overall survival and progression-free survival and improve locoregional and distant controls for nasopharyngeal carcinoma.

Porcine Mx1 Protein Inhibits Classical Swine Fever Virus Replication by Targeting Nonstructural Protein NS5B.

Mx proteins are interferon (IFN)-induced GTPases that have broad antiviral activity against a wide range of RNA and DNA viruses; they belong to the dynamin superfamily of large GTPases. In this study, we confirmed the anti-classical swine fever virus (CSFV) activity of porcine Mx1 in vitro and showed that porcine Mx2 (poMx2), human MxA (huMxA), and mouse Mx1 (mmMx1) also have anti-CSFV activity in vitro Small interfering RNA (siRNA) experiments revealed that depletion of endogenous poMx1 or poMx2 enhanced CSFV replication, suggesting that porcine Mx proteins are responsible for the antiviral activity of interferon alpha (IFN-α) against CSFV infection. Confocal microscopy, immunoprecipitation, glutathione S-transferase (GST) pulldown, and bimolecular fluorescence complementation (BiFC) demonstrated that poMx1 associated with NS5B, the RNA-dependent RNA polymerase (RdRp) of CSFV. We used mutations in the poMx1 protein to elucidate the mechanism of their anti-CSFV activity and found that mutants that disrupted the association with NS5B lost all anti-CSV activity. Moreover, an RdRp activity assay further revealed that poMx1 undermined the RdRp activities of NS5B. Together, these results indicate that porcine Mx proteins exert their antiviral activity against CSFV by interacting with NS5B.IMPORTANCE Our previous studies have shown that porcine Mx1 (poMx1) inhibits classical swine fever virus (CSFV) replication in vitro and in vivo, but the molecular mechanism of action remains largely unknown. In this study, we dissect the molecular mechanism of porcine Mx1 and Mx2 against CSFV in vitro Our results show that poMx1 associates with NS5B, the RNA-dependent RNA polymerase of CSFV, resulting in the reduction of CSFV replication. Moreover, the mutants of poMx1 further elucidate the mechanism of their anti-CSFV activities.

A flipped classroom method based on a small private online course in physiology.

A small private online course (SPOC) supports blended learning on a small scale, enabling students to have a more comprehensive and deeper learning experience. It also provides instructors with a flexible and feasible model to better understand the students' learning needs and to supervise students' learning behaviors. In this study, we adopted SPOC flipped classroom blended teaching in the physiology course for clinical undergraduate students of Kunming Medical University. Compared with the control group [lecture-based learning (LBL)], the SPOC flipped classroom method significantly increased the scores of students in the preclass test (65.13 ± 12.45 vs. 53.46 ± 8.09, SPOC vs. LBL) and postclass test (80.43 ± 14.29 vs. 69.01 ± 12.81, SPOC vs. LBL), which is induced by students' increased interest in self-learning. More importantly, the significant difference between the preclass scores of the two groups suggested that the video lecture-based preview is more effective than the textbook-based preview. The study indicated that the SPOC flipped classroom was effective in enhancing the examination scores of students, reflecting an improved learning efficiency and a deeper understanding of the knowledge. In summary, the flipped classroom based on SPOC improves learning outcomes compared with LBL and has a wide application in the learning of basic medical courses.

Mechanism of interaction between ocular and nasal neurogenic inflammation in allergic rhinoconjunctivitis.

PURPOSE: The mechanisms of naso-ocular interaction in allergic rhinoconjunctivitis are not well understood. Neurogenic inflammation affects both eyes and nose via the same neurogenic factors. The purpose of this study was to investigate the effects of neurogenic inflammation on conjunctival inflammation following nasal allergen provocation. METHODS: Sensitized rats were exposed to ovalbumin (OVA) via the nose. Parts of the nasal mucosa and conjunctivae were sliced and used for hematoxylin-eosin staining, immunohistochemical analysis, western blotting, and real-time polymerase chain reaction. The slides were observed under a light microscope, and the acquired images were analyzed. The levels of substance P (SP), vasoactive intestinal peptide (VIP), and nerve growth factor (NGF) were detected. RESULTS: The levels of SP, VIP, and NGF were increased in both nasal mucosa and conjunctivae 1 h and 24 h after OVA administration (p < 0.05). Higher levels of SP, VIP, and NGF expression were observed in the nasal mucosa and conjunctivae 24 h after OVA administration (p < 0.05). Following damage of the nasal sensory nerves by capsaicin, the protein and mRNA levels of SP, VIP, and NGF were reduced. CONCLUSION: In conclusion, the increased levels of VIP, SP, and NGF might be responsible for the ocular reaction following nasal challenge with allergen in rats.

[Value of transesophageal atrial pacing in neonates with tachyarrhythmia].

OBJECTIVE: To study the value of transesophageal atrial pacing (TEAP) in neonates with tachyarrhythmia. METHODS: The clinical data of 26 neonates with tachyarrhythmia who underwent TEAP electrophysiological examination or cardioversion were collected. RESULTS: Of the 26 neonates, 15(58%) were diagnosed with atrioventricular reentrant tachycardia, 3(12%) were diagnosed with sinus tachycardia, 3(12%) were diagnosed with ventricular tachycardia, 2(8%) were diagnosed with fast/slow atrioventricular nodal reentrant tachycardia, 2(8%) were diagnosed with atrial tachycardia, and 1(4%) was diagnosed with sinus tachycardia with ventricular preexcitation. Overdrive suppression was performed for 22 neonates, among whom 18 achieved successful cardioversion, and 2 with atrial tachycardia and 2 with ventricular tachycardia failed to restore sinus rhythm. CONCLUSIONS: TEAP is helpful to the diagnosis of tachyarrhythmia in neonates and can bring about a high rate of cardioversion success.

Entry of Classical Swine Fever Virus into PK-15 Cells via a pH-, Dynamin-, and Cholesterol-Dependent, Clathrin-Mediated Endocytic Pathway That Requires Rab5 and Rab7.

UNLABELLED: Classical swine fever virus (CSFV), a member of the genus Pestivirus within the family Flaviviridae, is a small, enveloped, positive-strand RNA virus. Due to its economic importance to the pig industry, the biology and pathogenesis of CSFV have been investigated extensively. However, the mechanisms of CSFV entry into cells are not well characterized. In this study, we used systematic approaches to dissect CSFV cell entry. We first observed that CSFV infection was inhibited by chloroquine and NH4Cl, suggesting that viral entry required a low-pH environment. By using the specific inhibitor dynasore, or by expressing the dominant negative (DN) K44A mutant, we verified that dynamin is required for CSFV entry. CSFV particles were observed to colocalize with clathrin at 5 min postinternalization, and CSFV infection was significantly reduced by chlorpromazine treatment, overexpression of a dominant negative form of the EPS15 protein, or knockdown of the clathrin heavy chain by RNA interference. These results suggested that CSFV entry depends on clathrin. Additionally, we found that endocytosis of CSFV was dependent on membrane cholesterol, while neither the overexpression of a dominant negative caveolin mutant nor the knockdown of caveolin had an effect. These results further suggested that CSFV entry required cholesterol and not caveolae. Importantly, the effect of DN mutants of three Rab proteins that regulate endosomal traffic on CSFV infection was examined. Expression of DN Rab5 and Rab7 mutants, but not the DN Rab11 mutant, significantly inhibited CSFV replication. These results were confirmed by silencing of Rab5 and Rab7. Confocal microscopy showed that virus particles colocalized with Rab5 or Rab7 during the early phase of infection within 45 min after virus entry. These results indicated that after internalization, CSFV moved to early and late endosomes before releasing its RNA. Taken together, our findings demonstrate for the first time that CSFV enters cells through the endocytic pathway, providing new insights into the life cycle of pestiviruses. IMPORTANCE: Bovine viral diarrhea virus (BVDV), a single-stranded, positive-sense pestivirus within the family Flaviviridae, is internalized by clathrin-dependent receptor-mediated endocytosis. However, the detailed mechanism of cell entry is unknown for other pestiviruses, such as classical swine fever (CSF) virus (CSFV). CSFV is the etiological agent of CSF, a highly contagious disease of swine that causes numerous deaths in pigs and enormous economic losses in China. Understanding the entry pathway of CSFV will not only advance our knowledge of CSFV infection and pathogenesis but also provide novel drug targets for antiviral intervention. Based on this objective, we used systematic approaches to dissect the pathway of entry of CSFV into PK-15 cells. This is the first report to show that the entry of CSFV into PK-15 cells requires a low-pH environment and involves dynamin- and cholesterol-dependent, clathrin-mediated endocytosis that requires Rab5 and Rab7.

Antinociceptive roles of galanin receptor 1 in nucleus accumbens of rats in a model of neuropathic pain.

It has been reported that galanin and its receptors might be involved in the modulation and transmission of nociception in the central nervous system. Our previous research has also demonstrated that galanin induces antinociception in the nucleus accumbens (NAc) of intact rats. However, the interaction between galanin and its receptors in the NAc and the underlying mechanism of suppressing pain transmission remain unclear. The present study seeks to determine the antinociception induced by galanin receptor (GalR)-1 stimulation in the NAc of rats with neuropathic pain. The left sciatic nerve of rats was ligated to mimic a neuropathic pain model. Western blots showed that the expression of GalR1 was significantly upregulated in the NAc of rats with neuropathic pain. Intra-NAc injection of GalR1 agonist M617 induced a dose-dependent increase in hindpaw withdrawal latency (HWL) to noxious thermal and mechanical stimulations in rats with neuropathic pain. Also, the effect of M617 was attenuated by M35, a GalR1/2 antagonist; at the same time, M35 reduced the galanin-induced antinociception, suggesting that GalR1 mediates antinociception induced by galanin in the NAc of rats with neuropathic pain. Furthermore, we found that M617-induced antinociception in rats with neuropathic pain was stronger than the antinociception in intact rats. We also found that injections of M617 and galanin each induced significant increases in HWL, but the galanin-induced antinociception was stronger than that of M617. All these results suggest that GalR1 plays an important role in antinociception and that other GalRs also are involved in pain modulation induced by galanin in the NAc of rats with neuropathic pain.

A novel mutation, D404N, in the connection subdomain of reverse transcriptase of HIV-1 CRF08_BC subtype confers cross-resistance to NNRTIs.

OBJECTIVES: Growing evidence suggests that mutations in the connection domain of the HIV-1 reverse transcriptase (RT) can contribute to viral resistance to RT inhibitors. This work was designed to determine the effects of a novel mutation, D404N, in the connection subdomain of RT of HIV-1 CRF08_BC subtype on drug resistance, viral replication capacity (RC) and RT activity. METHODS: Mutation D404N, alone or together with the other reported mutations, was introduced into an HIV-1 CRF08_BC subtype infectious clone by site-directed mutagenesis. Viral susceptibility to nine RT inhibitors, viral RC and the DNA polymerase activity of viral RT of the constructed virus mutants were investigated. A modelling study using the server SWISS-MODEL was conducted to explore the possible structure-related drug resistance mechanism of the mutation D404N. RESULTS: Single mutations D404N and H221Y conferred low-level resistance to nevirapine, efavirenz, rilpivirine and zidovudine. Double mutations Y181C/D404N and Y181C/H221Y significantly reduced susceptibility to NNRTIs. The most pronounced resistance to NNRTIs was observed with the triple mutation Y181C/D404N/H221Y. Virus containing D404N as the only mutation displayed ∼50% RC compared with the WT virus. The modelling study suggested that the D404N mutation might abolish the hydrogen bonds between residues 404 and K30 in p51 or K431 in p66, leading to impaired RT subunit structure and enhanced drug resistance. CONCLUSIONS: These results indicate that D404N is a novel NNRTI-associated mutation in the HIV-1 subtype CRF08_BC and provides information valuable for the monitoring of clinical RTI resistance.

Cell-based assays for Parkinson's disease using differentiated human LUHMES cells.

AIM: Lund human mesencephalic (LUHMES) cells can be differentiated to post-mitotic cells with biochemical, morphological and functional features of dopaminergic (DAergic) neurons. Given the limited scale of primary DAergic neuron culture, we developed differentiated LUHMES cell-based cytotoxicity assays for identifying neuroprotective agents for Parkinson's disease (PD). METHODS: LUHMES cells were incubated in a differentiation medium containing cAMP and GDNF for 6 d, and then differentiated cells were treated with MPP(+) or infected with baculovirus containing α-synuclein. Cytotoxicity was determined by measuring intracellular ATP levels and caspase 3/7 activity in the cells. DAergic neuron-specific marker protein and mRNA levels in the cells were analyzed using Western blotting and RT-PCR, respectively. RESULTS: LUHMES cells grew extensive neurites and became post-mitotic neuron-like cells during differentiation period, and three DAergic neuron markers TH, DAT and Nurr1 exhibited different expression profiles. MPP(+) dose-dependently reduced ATP levels in the cells with an IC50 value of 65 µmol/L. MPP(+) (80 µmol/L) significantly increased caspase 3/7 activity in the cells. Both the CDK inhibitor GW8510 and the GSK3ß inhibitor SB216763 effectively rescued MPP(+)-induced reduction of ATP levels with EC50 values of 12 and 205 nmol/L, respectively. Overexpression of α-synuclein also significantly decreased intracellular ATP levels and increased caspase 3/7 activity in the cells. GW8510 and SB216763 effectively rescued α-synuclein overexpression-induced reduction of ATP levels, whereas GW8510, but not SB216763, ameliorated α-synuclein overexpression-induced increase of caspase 3/7 activity. CONCLUSION: MPP(+)- and α-synuclein overexpression-induced cytotoxicity of differentiated LUHMES cells may serve as good alternative systems for identifying neuroprotective compounds for PD.

Optimal cold storage protocol for Anisopteromalus calandrae (Howard) (Hymenoptera: Pteromalidae), a biological control agent for coleopteran pests in stored products.

BACKGROUND: Anisopteromalus calandrae (Howard) is a solitary ectoparasitoid with wide-ranging potential applications as a natural biological control agent against various coleopterous pests in food warehouses. Implementing an effective cold storage program is crucial for extending the shelf life of biological control agents and ensuring their stable and abundant supply. Herein, we attempted to determine the optimal cold storage conditions for Anisopteromalus calandrae by investigating the effect of cold storage at three different temperatures (7, 13, and 19 °C) for 7, 21, and 35 days on four developmental stages (late-instar larvae, early-stage pupae, mid-stage pupae, and 2-day-old adults). Additionally, we explored the maximum cold storage potential by observing early-stage pupae stored at 13 °C for various durations (30, 60, 90, 120, and 150 days). RESULTS: The most suitable cold storage temperature for the early-stage pupae of Anisopteromalus calandrae was 13 °C, and the highest adult emergence rate (98.3%) was after 90 days of storage at 13 °C. Furthermore, we did not find any significant effect on longevity (female: 44.3 days; male: 38.1 days) or fecundity (121.7 wasps). The female ratio ranged from 43.5% to 50.8%. More importantly, cold storage did not adversely affect the developmental duration or fecundity of the offspring. CONCLUSION: This study offers crucial insights for managing Anisopteromalus calandrae populations under laboratory conditions and lays the foundation for potential industrial production and development. © 2023 Society of Chemical Industry.

A linker selective retention strategy to construct hierarchical porous metal-organic frameworks with high catalytic activity for oxidative desulfurization.

In order to improve the oxidative desulfurization (ODS) performance of MOF materials, an effective way is to convert a microporous MOF into a hierarchical porous MOF (HP-MOF) by utilizing the linker selective retention strategy. Herein, UiO-66 with the introduction of an unstable linker ligand (dihydro-1,2,4,5-tetrazine-3,6-dicarboxylate, dhtz) can selectively remove dhtz ligands to form HP-MOF (HP-UiO-66-dhtz) through heat treatment at high temperature. While maintaining the original structure of UiO-66, HP-UiO-66-dhtz features mesopores and abundant Lewis acid sites, showing excellent ODS performance for diphenylthiophene (DBT).