[Determination of amanita peptide and tryptamine toxins in wild mushrooms by high performance liquid chromatography-tandem mass spectrometry].

The discovery and identification of mushroom toxins has long been an important area in the fields of toxicology and food safety. Mushrooms are widely favored for their culinary and medicinal value; however, the presence of potentially lethal toxins in some species poses a substantial challenge in ensuring their safe consumption. Therefore, the development of a robust and sensitive analytical method is necessary for accurately identifying the risks associated with mushroom consumption. The study of mushroom toxins, which are characterized by their diversity and substantial variations in chemical structures, present a considerable challenge for achieving precise and high-throughput analysis. To address this issue, the present study employed a robust approach combining a solid-phase extraction (SPE) purification technique with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) to establish an analytical method for the detection and quantification of five amatoxins and two tryptamines (psilocybin and bufotenine) present in some mushrooms. Several optimization procedures were undertaken, including optimizing the chromatographic conditions, mass spectrometric parameters, and sample extraction and purification. The procedure involved the extraction of dry mushroom powder with methanol containing 0.3% formic acid, followed by purification using a strong cation exchange cartridge (SCX). The analytes were separated on a T3 chromatographic column (100 mm×2.1 mm, 1.8 µm) using mobile phases of acetonitrile and 5 mmol/L ammonium acetate solution containing 0.1% formic acid. The multiple reaction monitoring (MRM) mode was employed for data acquisition. Amatoxins were quantified using matrix-matched standard calibration curves, whereas isotopic internal standards were used to quantify tryptamine. The results showed that all seven toxins exhibited good linearities (r2>0.99) within the optimized concentration range. The limits of detection (LODs) for bufotenine, psilocybin, and amatoxins were determined as 2.0, 5.0, and 10 µg/kg, respectively, while the limits of quantification (LOQs) were determined as 5.0, 10, and 20 µg/kg, respectively. The LOD and LOQ values further underscore the ability of the method to detect minute quantities of toxins, making it particularly well suited for screening food samples for potential contamination. Using dried shiitake mushroom powder as the matrix, the recoveries of the two tryptamines ranged from 80.6% to 117%, with relative standard deviations (RSDs) ranging from 1.73% to 5.98%, while the recoveries of amatoxins ranged from 71.8% to 115%, with RSDs varying from 2.14% to 9.92% at the three concentration levels. The consistent and satisfactory recoveries of amatoxins and tryptamines demonstrated the ability of this method to accurately quantify the target analytes even in a complex matrix. Comparison with the results of supplementary test method recognized by State Administration for Market Regulation for food (BJS 202008) demonstrated comparable results, indicating no significant differences (p>0.05) in amatoxin contents. The newly developed method is rapid, accurate, precise, meets the required standards, and is suitable for the detection of seven toxins in wild mushrooms. As part of the application of this method, a comprehensive investigation of the distribution of toxins in wild mushrooms from Fujian Province was undertaken. In this study, 59 wild mushroom samples from nine cities were collected in the Fujian province. Species identification was conducted using rDNA-internal transcribed space (rDNA-ITS) molecular barcode technology, which revealed the presence of toxins in the two samples. Notably, one specimen named Amanita fuligineoides contained α-amanitin, ß-amanitin, and phalloidin in quantities of 607, 377, and 69.0 mg/kg, respectively. Additionally, another sample, identified as Tricholomataceae, had a psilocybin concentration of 12.6 mg/kg.

Effect of jet airflow deflection on cleaning performance of filter cartridge.

Pleated cartridge filters are widely used to remove dust in industrial processes. However, pulse-jet cleaning is not uniform on the filter cartridges. The phenomenon of pulsed jet airflow deflection exists during pulse jet cleaning, which causes a large impact on the local area of filter cartridge and shortens the service life of the filter cartridge. But perhaps due to the lack of effective testing methods, the impact of pulsed jet deflection on dust cleaning is often ignored. Under more comprehensive conditions, such as jet pressures, jet distance, and jet-hole diameter, the influence of the pulsed jet airflow deflection on the cleaning performance of the filter cartridge has been discussed systematically, by testing the peak static pressure on the side wall of the filter cartridge. The experimental results show that the sidewall peak static pressure of the face-flow surface of the filter cartridge is greater than that of the back-flow surface due to deflection, and the difference between the two is proportional to the jet-hole diameter and jet pressure. After installing the diversion nozzle, the results show that the peak static pressures of the face-flow and back-flow surfaces are basically the same. Therefore, it is proved that the diversion nozzle can effectively correct the jet airflow deflection.

The relationship between peak pressure and parameters of pulse-jet cleaning in a sintered plastic filter.

Sintered plastic filters are recently favored in industrial filtration systems because of their advantage of high filtration precision and long service life. In order to embody experimental characterization of pulse-jet cleaning of sintered plastic filters, tests were concluded on a self-made pulse-jet cleaning experimental platform. The cleaning characteristics of sintered plastic filters were investigated with varied pulse-jet parameters of tank pressure, nozzle diameter, and jet distance (the distance between nozzle and filter opening). The relationship between pressure distribution and pulse-jet cleaning parameters was established. The results showed that peak positive pressure on the corresponding sintered plastic filter inner wall increased with the increasing tank pressure. With the increasing jet distance, peak pressure first increased, then decreased, and with the increasing nozzle diameter, the optimum jet distance decreased gradually. At the optimum jet distance, the peak pressure with a nozzle diameter of 6 mm was the best, which was confirmed through the jet flow photographed by schlieren. The mathematical model obtained by curve fitting was s = (d - a)/2tan0.37275d2-1.33545d+35.950052. These results indicated that there was a direct relationship between the peak pressure and the parameters of pulse-jet cleaning in a sintered plastic filter. It provided theoretical support and application foundation for industrial dust-cleaning design.Implications: Sintered plastic filter is a new generation of high efficiency dust collector. Generally, its characteristics can be divided into three major categories as follows. 1) In terms of materials, the sintered plastic filter is made of PE substrate and coated with PTFE membrane, which makes it have stable chemical properties and can be used in high humidity, high oil, and other special situations. 2) In terms of dust cleaning, sintered plastic filter has high dust-cleaning efficiency of ultra-fine dust because of the unique membrane, which is not only limited to the surface of the filter plate, but also penetrates into the interior of the interstice. 3) In terms of structure, the sintered plastic filter is a rigid wavy porous structure filter of nine cavities formed by special sintering process of polymer material. This filter elements of integrated rigid design make its physical structure strong, not easy to deform and damage, and with a longer service life than traditional filters (bag filters and pleated fabric filter cartridges). In order to embody experimental characterization of pulse-jet cleaning of sintered plastic filters, tests were concluded on a self-made pulse-jet cleaning experimental platform described in this article. The cleaning characteristics of sintered plastic filters were investigated with varied pulse-jet parameters of tank pressure, nozzle diameter, and jet distance (the distance between nozzle and filter opening). The relationship between pressure distribution and pulse-jet cleaning parameters was established. These results indicated that there was a direct relationship between the peak pressure and the parameters of pulse-jet cleaning in a sintered plastic filter. It provided theoretical support and application foundation for industrial dust-cleaning design.

Jian-Pi-Yi-Fei granule suppresses airway inflammation in mice induced by cigarette smoke condensate and lipopolysaccharide.

INTRODUCTION: As a chronic, progressive, and lethal pulmonary disease, chronic obstructive pulmonary disease (COPD) is lacking effective treatment. Chronic inflammatory processes, including inflammatory cytokines, play an important role with in its pathogenesis. Jianpiyifei (JPYF) granule is a traditional Chinese herbal formula historically used to strengthen the spleen and tonify the lung. JPYF is used clinically to treat stable COPD. However, whether the purported anti-inflammatory effect of JPYF in COPD involves regulation of key inflammatory cytokines is not clear. MATERIALS AND METHODS: The mice model of pulmonary inflammation was induced by lipopolysaccharide (LPS) and cigarette smoke condensate (CSC). The influence of JPYF on airway inflammation in vivo was investigated. Mice were divided into three groups: control, model, and treatment groups. In the CSC + LPS model group and JPYF treatment group, intratracheal injection of CSC and LPS was used to induce airway inflammation for 5 days. JPYF group animals were also orally administered 5.5 g/kg JPYF granule for 12 days. RESULTS: The number of neutrophils and total cells in bronchoalveolar lavage fluid of the JPYF group were markedly lower than in the model group. The levels of interleukin (IL)-1 ß and IL-6 were lower; tumor necrosis factor-alpha was downregulated, and IL-10 was higher in the JPYF group than the model group. In the JPYF group, histone deacetylase 2 (HDAC2) activity and protein expression were restored. CONCLUSION: The anti-inflammatory activity of JPYF involves the suppression of pro-inflammatory cytokines, enhanced IL-10 secretion, and the restoration of HDAC2 activity.

Autophagy potentially protects against 2,3,7,8-tetrachlorodibenzo-p-Dioxin induced apoptosis in SH-SY5Y cells.

The environmental toxicant TCDD may elicit cytotoxic effects by inducing reactive oxygen species (ROS) generation. Autophagy is one of the first lines of defense against oxidative stress damage. Herein, we investigated whether autophagy played a regulatory role in TCDD-induced neurotoxicity. Here, we showed that TCDD exposure caused marked autophagy in SH-SY5Y cells, whose dose range was close to that inducing apoptosis. Electron microscopic and Western blot analyses revealed that TCDD induced autophagy at a starting dose of approximate 100 nM. Interestingly, 100-200 nM TCDD exposure resulted in obviously decreased cell viability and evident apoptotic phenotype. Furthermore, the levels of pro-apoptotic molecules, Bax and cleaved-PARP, increased significantly, whereas Bcl2 declined after exposed to 100 nM TCDD. In addition, the apoptosis was verified using flow cytometrical analysis. These data strongly suggested that TCDD induced both autophagy and apoptosis at a similar dose range in SH-SY5Y cells. Interestingly, pretreatment with ROS scavenger, N-acetyl-cysteine (NAC), could effectively block both TCDD-induced apoptosis and autophagy. More surprisingly, inhibition of autophagy with 3-methyladenine (3MA), remarkably augmented TCDD-induced apoptosis. The findings implicated that the onset of autophagy might serve as a protective mechanism to ameliorate ROS-triggered cytotoxic effects in human SH-SY5Y neuronal cells under TCDD exposure. © 2015 Wiley Periodicals, Inc. Environ Toxicol 31: 1068-1079, 2016.

2, 3, 7, 8-Tetrachlorodibenzo-p-dioxin induces premature senescence of astrocytes via WNT/ß-catenin signaling and ROS production.

2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD) is a ubiquitous environmental contaminant that could exert significant neurotoxicity in the human nervous system. Nevertheless, the molecular mechanism underlying TCDD-mediated neurotoxicity has not been clarified clearly. Herein, we investigated the potential role of TCDD in facilitating premature senescence in astrocytes and the underlying molecular mechanisms. Using the senescence-associated ß-galactosidase (SA-ß-Gal) assay, we demonstrated that TCDD exposure triggered significant premature senescence of astrocyte cells, which was accompanied by a marked activation of the Wingless and int (WNT)/ß-catenin signaling pathway. In addition, TCDD altered the expression of senescence marker proteins, such as p16, p21 and GFAP, which together have been reported to be upregulated in aging astrocytes, in both dose- and time-dependent manners. Further, TCDD led to cell-cycle arrest, F-actin reorganization and the accumulation of cellular reactive oxygen species (ROS). Moreover, the ROS scavenger N-acetylcysteine (NAC) markedly attenuated TCDD-induced ROS production, cellular oxidative damage and astrocyte senescence. Notably, the application of XAV939, an inhibitor of WNT/ß-catenin signaling pathway, ameliorated the effect of TCDD on cellular ß-catenin level, ROS production, cellular oxidative damage and premature senescence in astrocytes. In summary, our findings indicated that TCDD might induce astrocyte senescence via WNT/ß-catenin and ROS-dependent mechanisms.

Upregulated expression of SSTR1 is involved in neuronal apoptosis and is coupled to the reduction of bcl-2 following intracerebral hemorrhage in adult rats.

Somatostatins are peptide hormones that regulate diverse cellular processes, such as neurotransmission, cell proliferation, apoptosis, and endocrine signaling as well as inhibiting the release of many hormones and other secretory proteins. SSTR1 is a member of the superfamily of somatostatin receptors possessing seven-transmembrane segments. Aberrant expression of SSTR1 has been implicated in several human diseases, including pseudotumor cerebri, and oncogenic osteomalacia. In this study, we investigated a potential role of SSTR1 in the regulation of neuronal apoptosis in the course of intracerebral hemorrhage (ICH). A rat ICH model in the caudate putamen was established and subjected to behavioral tests. Western blot and immunohistochemistry indicated a remarkable up-regulation of SSTR1 expression surrounding the hematoma after ICH. Double-labeled immunofluorescence showed that SSTR1 was mostly co-localized with neurons, and was rarely distributed in activated astrocytes and microglia. Additionally, SSTR1 co-localized with active-caspase-3 and bcl-2 around the hematoma. The expression of active-caspase-3 was parallel with that of SSTR1 in a time-dependent manner. In addition, SSTR1 knockdown specifically resulted in reduced neuronal apoptosis in PC12 cells. All our findings suggested that up-regulated SSTR1 contributed to neuronal apoptosis after ICH, which was accompanied with reduced expression of bcl-2.

[Randomized, double-blind, multi-center, positive parallel control clinical trial of compound Wuzhigan capsules on anemopyretic cold].

Compound Wuzhigan capsules is a compound preparation composed of Wuzhigan, Shidagonglao, Gangmei, Shanzhima. A Randomized, double-blind, multi-center, positive parallel control designed to evaluate the clinical efficacy and safety of compound Wuzhigan capsules on anemopyretic cold. One hundred and twenty anemopyretic cold patients were given compound Wuzhigan capsules (test group), 2 capsules one time, three times a day, 119 patients were given compound Wuzhigan tablets (control group) ,4 tablets one time, three times a day; three days of treatment The study showed, the markedly effective rate and total effective rate respectively were 63. 3% and 80% of the test group. For the control group, the markedly effective rate and total effective rate respectively were 72. 5% and 80. 7%. The difference was not statistically significant. Compound Wuzhigan capsules can reduce the dosage, and get better patient compliance.

The PERK-eIF2α signaling pathway is involved in TCDD-induced ER stress in PC12 cells.

Studies have shown that 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induces apoptotic cell death in neuronal cells. However, whether this is the result of endoplasmic reticulum (ER) stress-mediated apoptosis remains unknown. In this study, we determined whether ER stress plays a role in the TCDD-induced apoptosis of pheochromocytoma (PC12) cells and primary neurons. PC12 cells were exposed to different TCDD concentrations (1, 10, 100, 200, or 500nM) for varying lengths of time (1, 3, 6, 12, or 24h). TCDD concentrations much higher than 10nM (100, 200, or 500nM) markedly increased glucose-regulated protein (GRP78) and C/EBP homologous protein (CHOP) levels, which are hallmarks of ER stress. We also evaluated the effects of TCDD on ER morphology in PC12 cells and primary neurons that were treated with different TCDD concentrations (1, 10, 50, or 200nM) for 24h. Ultrastructural ER alterations were observed with transmission electron microscopy in PC12 cells and primary neurons treated with high concentrations of TCDD. Furthermore, TCDD-induced ER stress significantly promoted the activation of the PKR-like ER kinase (PERK), a sensor for the unfolded protein response (UPR), and its downstream target eukaryotic translation initiation factor 2 α (eIF2α); in contrast, TCDD did not appear to affect inositol-requiring enzyme 1 (IRE1) and activating transcription factor 6 (ATF6), two other UPR sensors. Importantly, TCDD significantly inhibited eIF2α phosphorylation and triggered apoptosis in PC12 cells after 6-24h of treatment. Salubrinal, which activates the PERK-eIF2α pathway, significantly enhanced eIF2α phosphorylation in PC12 cells and attenuated the TCDD-induced cell death. In contrast, knocking down eIF2α using small interfering RNA markedly enhanced TCDD-induced cell death. Together, these results indicate that the PERK-eIF2α pathway plays an important role in TCDD-induced ER stress and apoptosis in PC12 cells.

2, 3, 7, 8-Tetrachlorodibenzo-P-dioxin (TCDD) induces premature senescence in human and rodent neuronal cells via ROS-dependent mechanisms.

The widespread environmental pollutant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a potent toxicant that causes significant neurotoxicity. However, the biological events that participate in this process remain largely elusive. In the present study, we demonstrated that TCDD exposure triggered apparent premature senescence in rat pheochromocytoma (PC12) and human neuroblastoma SH-SY5Y cells. Senescence-associated ß-galactosidase (SA-ß-Gal) assay revealed that TCDD induced senescence in PC12 neuronal cells at doses as low as 10 nM. TCDD led to F-actin reorganization and the appearance of an alternative senescence marker, γ-H2AX foci, both of which are important features of cellular senescence. In addition, TCDD exposure altered the expression of senescence marker proteins, such as p16, p21 and p-Rb, in both dose- and time-dependent manners. Furthermore, we demonstrated that TCDD promotes mitochondrial dysfunction and the accumulation of cellular reactive oxygen species (ROS) in PC12 cells, leading to the activation of signaling pathways that are involved in ROS metabolism and senescence. TCDD-induced ROS generation promoted significant oxidative DNA damage and lipid peroxidation. Notably, treatment with the ROS scavenger N-acetylcysteine (NAC) markedly attenuated TCDD-induced ROS production, cellular oxidative damage and neuronal senescence. Moreover, we found that TCDD induced a similar ROS-mediated senescence response in human neuroblastoma SH-SY5Y cells. In sum, these results demonstrate for the first time that TCDD induces premature senescence in neuronal cells by promoting intracellular ROS production, supporting the idea that accelerating the onset of neuronal senescence may be an important mechanism underlying TCDD-induced neurotoxic effects.