Modulating Electron Transfer between Pt and MOF Support through Pd Doping Promotes Nanozyme Catalytic Efficiency.

Electron transfer is considered to be a typical parameter that affects the catalytic activity of nanozymes. However, there is still controversy regarding whether higher or lower electron transfer numbers are beneficial for improving the catalytic activity of nanozymes. To address this issue, we propose the introduction of Pd doping as an important electron regulation strategy to tune electron transfer between Pt and ZIF-8 carriers (PtxPd1@ZIF-8). We observe a volcano-shaped relationship between the electron transfer number and catalytic activity, reaching its peak at Pt4Pd1@ZIF-8. Mechanism studies indicate that as the electron transfer number from Pt to ZIF-8 carriers increases, the d-band center of the active site Pt increases, reducing the occupancy of antibonding states and enhancing the adsorption capacity of the key intermediate (*O). However, a further increase in the adsorption of *O energy makes it difficult to desorb and participate in the next reaction, thus exhibiting volcanic activity. The optimized Pt4Pd1@ZIF-8 nanozyme is applied to develop an immunoassay for the detection of zearalenone, achieving a detection limit of 0.01 µg/L, which is 6 times higher than that of the traditional enzyme-linked immunosorbent assay. This work not only reveals the potential regulatory mechanism of electron transfer on the catalytic activity of nanozymes but also improves the performance of nanozyme-based biosensors.

A new deuterium-labeled compound [2,3,4,6,6'-2 H5 ]-D-glucose for deuterium magnetic resonance metabolic imaging.

Deuterium (2 H) magnetic resonance imaging is an emerging approach for noninvasively studying glucose metabolism in vivo, which is important for understanding pathogenesis and monitoring the progression of many diseases such as tumors, diabetes, and neurodegenerative diseases. However, the synthesis of 2 H-labeled glucose is costly because of the expensive raw substrates and the requirement for extreme reaction conditions, making the 2 H-labeled glucose rather expensive and unaffordable for clinic use. In this study, we present a new deuterated compound, [2,3,4,6,6'-2 H5 ]-D-glucose, with an approximate 10-fold reduction in production costs. The synthesis route uses cheaper raw substrate methyl-α-D-glucopyranoside, relies on mild reaction conditions (80°C), and has higher deuterium labeling efficiency. Magnetic resonance spectroscopy (MRS) and mass spectroscopy experiments confirmed the successful deuterium labeling in the compound. Animal studies demonstrated that the substrate could describe the glycolytic metabolism in a glioma rat model by quantifying the downstream metabolites through 2 H-MRS on an ultrahigh field system. Comparison of the glucose metabolism characteristics was carried out between [2,3,4,6,6'-2 H5 ]-D-glucose and commercial [6,6'-2 H2 ]-D-glucose in the animal studies. This cost-effective compound will help facilitate the clinical translation of deuterium magnetic resonance imaging, and enable this powerful metabolic imaging modality to be widely used in both preclinical and clinical research and applications.

Analyses on safety and efficacy of non-standard dose of r-tPA in intravenous thrombolysis-treated AIS patients.

Background: Intravenous 0.9 mg/kg recombinant tissue plasminogen activator (r-tPA) is one of the most effective treatments in acute ischemic stroke patients. Practically, the dose of r-tPA is still a topic that is constantly being discussed. Methods: For this observational study, data were obtained from 537 patients who received r-tPA thrombolysis at Shanghai Sixth People's Hospital stroke center over 5 years (2014-2019). Patients were divided into two groups: a non-standard dose group (0.6 mg/kg ≤ dose < 0.9 mg/kg) and a standard dose group (0.9 mg/kg). Different outcomes were observed: efficacy: 3 months mRS 0-1 (3m-mRS0-1); safety: symptomatic intracranial hemorrhage within 24 h (24h-sICH) and 3 months mortality (3m-death). We also observed the effect of r-tPA dose coefficient on outcomes in different age groups and baseline National Institute of Health stroke scale (NIHSS) score subgroups. Results: There were 265 patients who gave the standard dose treatment and 272 gave the nonstandard dose. There was no significant difference between the non-standard dose group and the standard dose group in 3m-mRS0-1, 3m-death, and 24h-sICH (p = 0.567, 0.327, and 0.415, respectively). The dose coefficient presents a significant negative correlation (p = 0.034, B = -4.290) with 3m-death in NIHSS < 16 sub-group. Door-to-needle time (DNT) is the most important independent outcome-influential factor (MIOIF) in the NIHSS ≥16 sub-group. The diabetes history and baseline NIHSS score were the MIOIF in the age ≥80-year sub-group. Conclusions: The non-standard dose group (0.6 mg/kg ≤ dose < 0.9 mg/kg) shows no difference in safety and effectiveness than the standard dose group (0.9 mg/kg) in our study. The standard dose should be considered first according to current evidence and Guidelines, but the non-standard dose (0.6 mg/kg ≤ dose < 0.9 mg/kg) might be an option in the actual diagnosis and treatment process considering the patient's clinical profile and financial condition.

Transcriptome analysis and screening of putative sex-determining genes in the invasive pest, Frankliniella occidentalis (Thysanoptera: Thripidae).

The invasive insect pest, Frankliniella occidentalis, is a well-known vector that transmits a variety of ornamental and vegetable viruses. The mechanistic basis of sex determination in F. occidentalis is not well understood, and this hinders our ability to deploy sterile insect technology as an integrated pest management strategy. In this study, six cDNA libraries from female and male adults of F. occidentalis (three biological replicates each) were constructed and transcriptomes were sequenced. A total of 6000 differentially-expressed genes were identified in the two sexes including 2355 up- and 3645 down-regulated genes. A total of 149 sex-related genes were identified based on GO enrichment data and included transformer-2 (tra2), fruitless (fru), male-specific lethal (msl) and sex lethal (sxl); several of these exhibited sex-specific and/or sex-biased expression in F. occidentalis. This study contributes to our understanding of the sex-determined cascade in F. occidentalis and other members of the Thysanoptera.

Identification, expression analysis and functional verification of two genes encoding small heat shock proteins in the western flower thrips, Frankliniella occidentalis (Pergande).

Small heat shock proteins (sHSPs) help prevent the irreversible aggregation of denatured proteins that occurs in response to organismal stress. In this study, we identified two intron-free genes encoding sHSPs from Frankliniella occidentalis; these were designated FoHSP11.6 and FoHSP28.0 and belonged to an atypical and typical sHSP family, respectively. Both FoHSPs were transcribed in all developmental stages of F. occidentalis with the highest expression levels in pupae and adults and greater expression in males than females. Although the FoHSPs had different temperature-induced expression profiles, they were generally induced by both low and high temperatures and reached maximal expression levels after 0.5-1 h of temperature stress. The FoHSPs expression levels in pupae were induced by drought and high humidity, and higher expression levels were correlated with lower survival rates. The thermotolerance of F. occidentalis decreased when theFoHSPs were silenced by RNA interference. Our results show that FoHSP11.6 and FoHSP28.0 are involved in the response to temperature and drought and may also function in growth and development of F. occidentalis.

Postoperative cytokine levels and their predictive value in critical patients after major abdominal surgery: a retrospective cohort study.

BACKGROUND: It remains uncertain as to what impact cytokine expression level has on patient outcomes. The association of serum levels of interleukin-1ß (IL-1ß), IL-2, IL-6, IL-8, IL-10, tumor necrosis factor-α (TNF-α), and procalcitonin with critically ill patient outcomes after major abdominal surgery still need to be explored. METHODS: From January 1, 2018 to June 30, 2019, a retrospective cohort study was conducted on patients admitted to the surgical intensive care unit (SICU). Levels of IL-1ß, IL-2, IL-6, IL-8, IL-10, TNF-α, and procalcitonin were assessed in 1,228 patients undergoing major abdominal surgery with blood samples drawn within 24 h after surgery. RESULTS: Of the 1,228 patients admitted to the SICU for the first time, 1,152 survived and 76 patients died, with a mortality rate of 6.2% (76/1,228). The results of univariate and multivariate analyses revealed that non-survivors had higher levels of IL-1ß (OR =2.438, P<0.001) and IL-2 (OR =1.561, P=0.006). Of 62 (5.0%) readmitted to the SICU, the data of 59 were collected, and showed 46 patients survived and 13 died, giving a mortality rate of 22.0% (13/59), which was 3.5 times higher than the mortality rate during the first SICU admission. Serum IL-6 level associated with SICU readmission (OR =1.37, P=0.029). Furthermore, non-survivors had a longer SICU stay and higher rates of mechanical ventilation and continuous renal replacement therapy (CRRT). CONCLUSIONS: High levels of IL-1ß and IL-2 were associated with mortality, and a high level of IL-6 was a risk factor for SICU readmission in critically ill patients who underwent major abdominal surgery. The mortality rate was higher during the second SICU stay.

Effect of hip fracture on prognosis of acute cerebral infarction.

OBJECTIVES: Hip fractures are a worldwide public health problem. The incidence of hip fracture is high among the elderly, and it is an important cause of death and disability in this population. This observational study aimed to investigate the effect of acute hip fracture on the recovery of neurological function and the prognosis of patients with acute cerebral infarction, as well as whether surgical treatment of combined acute fracture can improve the prognosis of patients. METHODS: Thirty patients with acute cerebral infarction combined with acute hip fracture, who were hospitalized in two hospitals between January 1, 2013 and December 31, 2019, were included. The patients did not undergo surgical treatment. The control group included patients with common acute cerebral infarction without hip fracture admitted in the same period. The neurological function recovery, hospitalization period, half a year recovery rate, incidence of complications, and one-year mortality rate between the two groups were compared. Eleven patients with acute cerebral infarction combined with hip fracture, who underwent surgical treatment, were selected and compared with those in the non-surgery group. RESULTS: Compared with patients with common acute cerebral infarction, the National Institutes of Health Stroke Scale score of those with acute cerebral infarction combined with hip fracture was higher (7.2±5.4 vs. 5.6%±4.3, p=0.034), the hospitalization period was prolonged (16.1±8.9% vs. 12.2±5.3, p=0.041), and the half a year recovery rate was lower (26.7% vs. 53.3%, p=0.016). Additionally, the incidence of pulmonary infection and lower extremity deep vein thrombosis was increased (30% vs. 11.7%, p=0.03; 6.7% vs. 0, p=0.043). The one-year mortality rate of patients with hip fracture was higher than that of patients with common cerebral infarction (23.3% vs. 6.7%, p=0.027). Compared with the non-surgical group, the good recovery rate after half a year of surgical treatment of the group with cerebral infarction and acute hip fracture had an increasing trend, while the hospitalization cycle, incidence of complications, and one-year mortality rate were all decreased, although this was not statistically significant. CONCLUSIONS: Acute cerebral infarction combined with hip fracture leads to worse neurological recovery, prolonged hospitalization period, increased complications, decreased patient prognosis, and increased one-year mortality. Surgical treatment improves the prognosis of patients with acute cerebral infarction. These findings may provide insights into the management of acute cerebral infarction.

Differential regulation of antioxidant enzymes in Frankliniella occidentalis (Thysanoptera: Thripidae) exposed to thermal stress.

Frankliniella occidentalis is an invasive insect pest that incites damage to ornamental and agronomic crops on a global scale. In this study, the effects of temperature on gene expression and enzyme activity were studied for superoxide dismutase (SOD), peroxidase (POD), and glutathione-S-transferase (GST) in F. occidentalis. SOD, POD and GST enzyme activity increased significantly at 35-37 °C but declined as the temperature increased to 41 °C. In a time course study at 35 °C, SOD, POD and GST activities were significantly elevated at 0.5, 1 and 2 h in comparison to the control at 26 °C. Expression patterns were evaluated for the three antioxidant genes under high and low temperature stress. In a time course study at -4 °C, SOD, POD and GST expression peaked at 1 h and declined at 2 h of exposure. In contrast, when transcription was monitored at 35 °C, expression was lowest at 1 h and increased at 2 h. The results provide data that will be useful in deciphering the role of antioxidant enzymes in the adaptation of F. occidentalis to climate change.

Granulocyte-colony stimulating factor, a potential candidate for the treatment of Parkinson's disease.

BACKGROUND: Granulocyte colony-stimulating factor (G-CSF) activates the PI3K/Akt pathway to exert neuroprotective effects. The current study aimed to determine if G-CSF reverses behavioral deficits, even after motor malfunction occurs in Paraquat (PQ)-treated mice. METHODS: Male C57BL/6 mice (8 weeks old) were divided into 3 groups: PQ + G-CSF-treated group (n=8); PQ + saline-treated group (n=8); and saline-treated control group (n=8). Spontaneous locomotor activity was evaluated together with the pole test. The DA, 3, 4-dihydroxyphenyl acetic acid (DOPAC), and homovanillic acid (HVA) levels in the bilateral striatum were determined by HPLC. The number of substantia nigra pars compacta tyrosine hydroxylase (TH)-immunoreactive neurons was calculated using an unbiased cell counting stereology method, the activities of total GSH-PX and SOD, and the malondialdehyde (MDA) content were assessed. RESULTS: After G-CSF treatment, spontaneous motor activity and the Tturn and TLA times in the CSF group were significantly lower than the control group, and the striatal dopamine level in the striatum and the number of TH-positive neurons in the substantia nigra (SN) were significantly increased compared to the control group (5478 ± 654 vs. 3647±488 DA neurons, P < 0.05). Compared to the control group, the GSH-PX and SOD activities were increased, while the MDA level was significantly decreased in the SN (P<0.05). CONCLUSIONS: The data strongly suggest that G-CSF reverses behavioral deficits in PQ-treated mice with movement disorders. Thus, G-CSF may be utilized as a prospective drug candidate for the treatment of Parkinson's disease.

The Differing Roles of Cognitive Empathy and Affective Empathy in the Relationship Between Trait Anger and Aggressive Behavior: A Chinese College Students Survey.

Empathy is essential for effective social interaction. People often express the belief that empathy is closely related to aggressive behavior, but empirical data has challenged this assumption. However, there is a lack of research that focuses on the role of empathy in the relationship between trait anger and aggressive behavior. The current research focuses on the roles that different components of empathy have performed in the combinations of trait anger-hostile cognition-aggressive behavior link and attempt to identify, with reference to Integrated Model of Emotion Processes and Cognition in Social Information Processing, at which step this may occur. Participants included 663 undergraduate students who completed self-report measures of Trait Anger Scale, Aggressive Behavior Questionnaire, the Interpersonal Reactivity Index, and the Reactive-Proactive Aggression Questionnaire. Results from correlation analysis show that there is no significant correlation between cognitive empathy and aggressive behavior (r = -.06) but do however suggest a significant correlation between affective empathy and aggressive behavior (r = -.19). Results from structural equation modeling reveal that different components of empathy perform different roles in relation to aggressive behavior. The moderated mediating model analysis results show that cognitive empathy played a moderating role in both the direct effect and the first stage of the mediating model of trait anger-hostile cognition-aggression behavior. The results of multiple mediation model analysis demonstrate that affective empathy only played a partial mediating role between hostile cognition and aggressive behavior. This study contributes to understanding of Social Information Processing Models (SIPMs) and provides insight into the relationship between empathy and aggressive behavior.

Evolutionary conservation and functional impact of dopamine D2 receptor.

PURPOSE: Dopamine D2-like receptors (D2) mediate various effects of dopamine. Characterizing the structural and functional regions can contribute to understanding the mechanism of biological effects of dopamine. METHODS: A large scale phylogeny was utilized to construct a comprehensive dataset of D2 receptor, the evolutionary conserved residues were calculated at both super-family and sub-family (included human D2clade) levels, and then 3D structure of human D2 receptor (DRD2) was modeled to evaluate the significance of these conserved residues and motifs linked with structural stability, genetic variants, functional activation, protein interaction and drug binding. RESULTS: All the drug binding sites and important protein-complex binding motifs showed evolutionary super-family conservation. However, genetic variants linked to different diseases all belonged to sub-family conservation. The extra cellular loop (ECL3) domain consisted of both super-family and sub-family conserved residues. CONCLUSIONS: Sub-family conserved residues probably play a vital role in the incidence and progression of diseases.

Cloning of a new HSP70 gene from western flowerthrips, Frankliniella occidentalis, and expression patterns during thermal stress.

Frankliniella occidentalis (Pergande) is an invasive pest that endangers a wide variety of horticultural and agronomic crops. HSP70 is the most important member of the heat shock protein (HSP) family and plays an important role in insect thermal tolerance. In this study, a new gene encoding HSP70 from F. occidentalis, Fohsp706, was selected from the F. occidentalis transcriptome exposed to thermal stress (40 °C) and cloned by RT-PCR and RACE. Further characterization indicated that Fohsp706 localizes to the cytoplasm and does not contain introns. Quantitative real-time reverse transcriptase PCR indicated that Fohsp706 expression was significantly up-regulated by thermal stress; furthermore, there were significant differences in Fohsp706 expression in adults and second instar nymphs after heat stress. Our results indicated that Fohsp706 contributes to thermotolerance in F. occidentalis and provides another example of how this pest adapts to unfavorable environmental conditions.

Acteoside Binds to Caspase-3 and Exerts Neuroprotection in the Rotenone Rat Model of Parkinson's Disease.

Parkinson's disease (PD) is characterized by the progressive degeneration of the dopaminergic neurons in the substantia nigra (SN) region. Acteoside has displayed multiple biological functions. Its potential role against PD and the underlying signaling mechanisms are largely unknown. Here, we showed that oral administration of acteoside significantly attenuated parkinsonism symptoms in rotenone-induced PD rats. Further, acteoside inhibited rotenone-induced α-synuclein, caspase-3 upregulation and microtubule-associated protein 2 (MAP2) downregulation in PD rats. The molecular docking and molecular dynamics (MD) simulation results indicated that acteoside may directly bind to and inhibit caspase-3. Acteoside formed hydrogen bonds with at least six residues of caspase-3: ThrA177, SerA178, GlyA238, SerB339, ArgB341 and TrpB348. In addition, a pi-pi interaction was formed between acteoside and caspase-3's HisA237, which might further stabilize the complex. MD simulation results demonstrated that the binding affinity of the caspase-3-acteoside complex was higher than that of caspase-3 and its native ligand inhibitor. Together, we show that acteoside binds to caspase-3 and exerts neuroprotection in the rotenone rat model of PD.

[Chemical Composition of Alkanes and Organic Acids in Vehicle Exhaust].

The soot of 11 diesel buses and 20 gasoline cars was sampled by direct sampling, and the main organic compounds of the samples were separated and qualitatively analyzed by GC-MS. The results showed that the mass fraction of n-alkanes was 1.31-149.08 µg·g-1 and 15.35-556.03 µg·g-1. The main carbon number of n-alkanes in diesel buses and gasoline cars soot was 20 and 29, respectively, and gasoline cars generated more long chain alkanes with high boiling point. The total mass fraction of pristane and phytane in diesel buses was 15.24 µg·g-1 and 21.79 µg·g-1, respectively, while the two values in gasoline cars were 2.31 µg·g-1 and 2.69 µg·g-1, respectively. The ratios of pristane and phytane were 0.6994 and 0.8587, and the ratios of phytane and octadecane were 0.3565 and 0.7472. The changes of the relative mass of fatty acids were relatively large, the change ranges in buses and cars were 0.01-40.87 µg·g-1 and 3.8-113.7 µg·g-1, respectively, and the organic acid with the highest content in the buses was 3- hydroxybutyric acid.The maximal ratio of hexadecanoic acid and butanedioic acid (C3/C4) was 5.93. The most abundant n-alkanes in gasoline cars soot was C16, and the mass fraction of aromatic acids was 5.05-31.70 µg·g-1 and 0.1-228.38 µg·g-1, respectively.

Evolutionary aspects of the synuclein super-family and sub-families based on large-scale phylogenetic and group-discrimination analysis.

Over the last decade, many genetic studies have suggested that the synucleins, which are small, natively unfolded proteins, are closely related to Parkinson's disease and cancer. Less is known about the molecular basis of this role. A comprehensive analysis of the evolutionary path of the synuclein protein family may reveal the relationship between evolutionarily conserved residues and protein function or structure. The phylogeny of 252 unique synuclein sequences from 73 organisms suggests that gamma-synuclein is the common ancestor of alpha- and beta-synuclein. Although all three sub-families remain highly conserved, especially at the N-terminal, nearly 15% of the residues in each sub family clearly diverged during evolution, providing crucial guidance for investigations of the different properties of the members of the superfamily. His50 is found to be an alpha-specific conserved residue (91%) and, based on mutagenesis, evolutionarily developed a secondary copper binding site in the alpha synuclein family. Surprisingly, this site is located between two well-known polymorphisms of alpha-synuclein, E46K and A53T, which are linked to early-onset Parkinson's disease, suggesting that the mutation-induced impairment of copper binding could be a mechanism responsible for alpha-synuclein aggregation.