Mao Z

References (23)

Title : Molecular, behavioral, and growth responses of juvenile yellow catfish (Tachysurus fulvidraco) exposed to carbamazepine - Chen_2024_Aquat.Toxicol_271_106929
Author(s) : Chen H , Gu X , Mao Z , Zeng Q , Jin M , Wang W , Martyniuk CJ
Ref : Aquat Toxicol , 271 :106929 , 2024
Abstract : Carbamazepine (CBZ) is an anticonvulsant medication used to treat epilepsy and bipolar disorder. Due to its persistence and low removal rate in wastewater treatment plants, it is frequently detected in the environment, raising concerns regarding its potential adverse effects on aquatic organisms and ecosystems. In this study, we aimed to assess the impact of CBZ on the behavior and growth of juvenile yellow catfish Tachysurus fulvidraco, a native and economically important species in China. Fish were exposed to CBZ at three concentrations of 1, 10, or 100 microg/L for 14 days. The fish exposed to 10 and 100 microg/L of CBZ exhibited decreased feeding, and a significant increase in cannibalistic tendencies was observed in fish exposed to 100 microg/L CBZ. Acetylcholinesterase activity was increased in the brain of fish exposed to 100 microg/L CBZ. CBZ also inhibited the growth of yellow catfish. To better elucidate mechanisms of toxicity, transcriptomics was conducted in both the brain and liver. In the brain, gene networks associated with neurotransmitter dysfunction were altered by CBZ, as well as networks associated with mitochondrial dysfunction and metabolism. In the liver, gene networks associated with the immune system were altered by CBZ. The current study improves comprehension of the sub-lethal effects of CBZ and reveals novel insight into molecular and biochemical pathways disrupted by CBZ, identifying putative key events associated with reduced growth and altered behavior. This study emphasizes the necessity for improved comprehension of the effects of pharmaceutical contaminants on fish at environmentally relevant levels.
ESTHER : Chen_2024_Aquat.Toxicol_271_106929
PubMedSearch : Chen_2024_Aquat.Toxicol_271_106929
PubMedID: 38663201

Title : Omics techniques reveal the toxicity mechanisms of three antiepileptic drugs to juvenile zebrafish (Danio rerio) brain and liver - Yang_2023_Aquat.Toxicol_262_106668
Author(s) : Yang H , Gu X , Chen H , Zeng Q , Mao Z , Ge Y
Ref : Aquat Toxicol , 262 :106668 , 2023
Abstract : Epilepsy, a neurological disorder, is characterized by seizures that are an appearance of excessive brain activity and is symptomatically treated with antiepileptic drugs (AEDs). Oxcarbazepine (OCBZ), lamotrigine (LTG), and carbamazepine (CBZ) are widely used AEDs in clinics and are very often detected in aquatic environments. However, neither the sub-lethal effects nor the specific mechanisms of these AEDs' action on the fish are well understood. In this study, juvenile zebrafish were exposed to a sub-lethal concentration (100 microg/L) of OCBZ, LTG, and CBZ for 28 d, after which indicators of oxidative stress (i.e. superoxide dismutase (SOD) activity, catalase (CAT) activity, and malondialdehyde (MDA) level) and neurotoxicity (i.e. acetylcholinesterase (AChE) activity, gamma-aminobutyric acid (GABA) level, and glutamic acid (Glu) level) were measured. Brain SOD activity was significantly increased by three AEDs, while brain CAT activity was significantly inhibited by LTG and CBZ. Liver SOD activity was significantly enhanced by CBZ, and liver CAT activity was significantly induced by OCBZ and LTG. Liver MDA level was significantly increased by three AEDs. Brain AChE activity was significantly increased by LTG and CBZ, and brain GABA level was significantly enhanced by three AEDs. However, there were no significant alterations in the levels of MDA and Glu in zebrafish brain. To ascertain mechanisms of AEDs-induced toxicity, brain transcriptomics and liver metabolomics were conducted in zebrafish. The brain transcriptomics results showed that lots of differentially expressed genes (DEGs) were enriched in the sensory system, the immune system, the digestive system, the metabolic processes, and others in three AEDs treated groups. The metabolomics data indicated dysregulation of glycerophospholipid signaling and lipid homeostasis in zebrafish liver after three AEDs exposure. The overall results of this study improve understanding of the sub-lethal effects and potential molecular mechanisms of action of AEDs in fish.
ESTHER : Yang_2023_Aquat.Toxicol_262_106668
PubMedSearch : Yang_2023_Aquat.Toxicol_262_106668
PubMedID: 37659109

Title : Immobilization for Lipase: Enhanced Activity and Stability by Flexible Combination and Solid Support - Hu_2022_Appl.Biochem.Biotechnol__
Author(s) : Hu R , Niu Z , Lu Y , Zhu H , Mao Z , Yan K , Hu X , Chen H
Ref : Appl Biochem Biotechnol , : , 2022
Abstract : In this study, an enhanced activity and stability method for immobilizing porcine pancreatic lipase (PPL) was developed based on ZIF-8 encapsulated supramolecular-modified gold nanoparticle complexes (pSC(4)-AuNPs@ZIF-8). Supramolecular calix[4]arene (pSC(4)) can recognize the amino group of PPL through non-covalent force, and this flexible binding method protected the structure of PPL during the immobilization process. Due to the hydrophilic of pSC(4)-AuNPs and hydrophobic of ZIF-8, PPL can maintain a "lid open" conformation, which can enhance the stability of PPL structure and reduce PPL activity loss. ZIF-8 was used to immobilize PPL to avoid the difficult recovery of free PPL. Compared with the native form of PPL, it exhibited 70.6% maintained activity with terrific pH and temperature stability, and had good performance in thermal stability, time stability, and reusability. In addition, three immobilized PPL methods were designed to further clarify the influence of synthetic methods and additives on the activity and stability of PPL. Importantly, the loading rate of pSC(4)-AuNPs@ZIF-8@PPL was up to 51.2% among these immobilized PPL systems. Therefore, pSC(4)-AuNPs@ZIF-8 may serve as a versatile and promising immobilization system for enzymes.
ESTHER : Hu_2022_Appl.Biochem.Biotechnol__
PubMedSearch : Hu_2022_Appl.Biochem.Biotechnol__
PubMedID: 35852759

Title : Dioscin alleviates Alzheimer's disease through regulating RAGE\/NOX4 mediated oxidative stress and inflammation - Guan_2022_Biomed.Pharmacother_152_113248
Author(s) : Guan L , Mao Z , Yang S , Wu G , Chen Y , Yin L , Qi Y , Han L , Xu L
Ref : Biomed Pharmacother , 152 :113248 , 2022
Abstract : Alzheimer's disease (AD) is a neurodegenerative disease with amyloid beta (Abeta) deposition and intracellular neurofibrillary tangles (NFTs) as its characteristic pathological changes. Ameliorating oxidative stress and inflammation has become a new trend in the prevention and treatment of AD. Dioscin, a natural steroidal saponin which exists in Dioscoreae nipponicae rhizomes, displays various pharmacological activities, but its role in Alzheimer's disease (AD) is still unknown. In the present work, effect of dioscin on AD was evaluated in injured SH-SY5Y cells induced by H(2)O(2) and C57BL/6 mice with AD challenged with AlCl combined with D-galactose. Results showed that dioscin obviously increased cell viability and decreased reactive oxygen species (ROS) level in injured SH-SY5Y cells. In vivo, dioscin obviously improved the spatial learning and memory abilities as well as gait and interlimb coordination disorders of mice with AD. Moreover, dioscin distinctly restored the levels of malondialdehyde (MDA), superoxide dismutase (SOD), amyloid beta 42 (Abeta(42)), acetylcholine (ACh) and acetylcholinesterase (AChE) of mice, and reversed the histopathological changes of brain tissue. Mechanism studies revealed that dioscin markedly down-regulated the expression levels of RAGE and NOX4. Subsequently, dioscin markedly up-regulated the expression levels of Nrf2 and HO-1 related to oxidative stress, and down-regulated the levels of p-NF-kappaB(p-p65)/NF-kappaB(p65), AP-1 and inflammatory factors involved in inflammatory pathway. RAGE siRNAs transfection further clarified that the pharmacological activity of dioscin in AD was achieved by regulating RAGE/NOX4 pathway. In conclusion, dioscin showed excellent anti-AD effect by adjusting RAGE/NOX4-mediated oxidative stress and inflammation, which provided the basis for the further research and development against AD.
ESTHER : Guan_2022_Biomed.Pharmacother_152_113248
PubMedSearch : Guan_2022_Biomed.Pharmacother_152_113248
PubMedID: 35691153

Title : Pesticide Residues in Commonly Consumed Vegetables in Henan Province of China in 2020 - Ma_2022_Front.Public.Health_10_901485
Author(s) : Ma C , Wei D , Liu P , Fan K , Nie L , Song Y , Wang M , Wang L , Xu Q , Wang J , Shi J , Geng J , Zhao M , Jia Z , Huan C , Huo W , Wang C , Mao Z , Huang S , Zeng X
Ref : Front Public Health , 10 :901485 , 2022
Abstract : BACKGROUND: Pesticides are widely used in agricultural production to control insect pests and regulate plant growth in China, which may result in the presence of some pesticide residues in the vegetables. However, few studies of monitoring pesticides have been conducted in Henan Province. The aim of this study was to evaluate the level of pesticide residues in commonly consumed vegetables in the regions of Henan Province. METHODS: In this study, we collected 5,576 samples of 15 different vegetables in 17 areas from Henan Province during 2020. Eight kinds of pesticides were analyzed by gas chromatography-mass spectrometry (GC-MS), including procymidone, lambda-cyhalothrin, cypermethrin, pendimethalin, isocarbophos, isazophos, fenthion and deltamethrin. The chi-square test was used to compare the detection rates of pesticide residues in different regions. RESULTS: Of all the pesticides above, procymidone, lambda-cyhalothrin, cypermethrin, pendimethalin and isocarbophos were detected in vegetables, the detection rates were 27.0%, 16.2%, 11.4%, 3.5%, and 1.9%, respectively. However, isazophos, fenthion, and deltamethrin were not detected. In addition, procymidone, lambda-cyhalothrin, and cypermethrin were detected in urban areas, while pendimethalin was detected in rural areas. The detection rates of cypermethrin and pendimethalin in rural were 19.8% and 5.4%, respectively, which in urban were at relatively lower levels (13.7% and 1.9%, respectively) (P < 0.05). Compared the differences of pesticide detection rates among five areas of Henan province, we found that there were statistical differences in the detection rates of procymidone, cypermethrin and lambda-cyhalothrin in different regions (all P < 0.05). CONCLUSION: The results have revealed that the pesticide residues are present. Higher detection rates and more types of pesticides were found in rural areas than urban areas. In addition, there were higher detection rates in Eastern Henan. The findings provided valuable information on the current pesticide residues status, which can be a reference of pesticide supervision and management.
ESTHER : Ma_2022_Front.Public.Health_10_901485
PubMedSearch : Ma_2022_Front.Public.Health_10_901485
PubMedID: 35757605

Title : Characterization of 4 deletion mutants of Pseudomonas plecoglossicida and their potential for live attenuated vaccines in large yellow croaker (Larimichthys crocea) - Li_2022_Fish.Shellfish.Immunol_S1050-4648_00352
Author(s) : Li Y , Chi Y , Li S , Jia T , Mao Z
Ref : Fish Shellfish Immunol , : , 2022
Abstract : To search for live attenuated vaccines (LAV) candidates against Pseudomonas plecoglossicida, the causative agent of the visceral granulomas disease in farmed large yellow croaker (Larimichthys crocea), two type VI secretion systems (T6SS) and a predicted alpha/beta fold family hydrolase encoding gene, ORF4885 were targeted to construct deletion mutants. The biological profiles of 4 mutants were characterized; LD50 to the croakers detected, in vivo survival post-infection investigated relative percent of survival (RPS) of the croakers 28d post-vaccination determined, and transcription of five immunity-related genes of the treated fish was quantified. On comparison to the WT, the mutants revealed similar growth curves in 11h; swarming motility of delta4885 declined significantly at 72h post-incubation (P < 0.05); deltaS1delta4885 showed significantly poor biofilm formation and weak resistance to fish serum bactericidal activity (P < 0.05). LD50 of the mutants were much higher than the WT, indication of strong virulence attenuation; in vivo survival test showed the mutant deltaS1delta4885 and deltaS1deltaS3 were eliminated by the host 10d post-infection, demonstration of the safety and potentiality to be LAV candidates. Immunization with the mutant deltaS1delta4885 provided higher RPS than deltaS1deltaS3. Transcription of IgT was significant in all immunized groups while IgM increased only in intraperitoneally injected groups. This study successfully searched a quite safe and strong immunogenic LAV candidate to defeat P. plecoglossicida infection.
ESTHER : Li_2022_Fish.Shellfish.Immunol_S1050-4648_00352
PubMedSearch : Li_2022_Fish.Shellfish.Immunol_S1050-4648_00352
PubMedID: 35752370
Gene_locus related to this paper: 9psed-s2k464

Title : Molecular and behavioral responses of zebrafish embryos\/larvae after sertraline exposure - Yang_2021_Ecotoxicol.Environ.Saf_208_111700
Author(s) : Yang H , Liang X , Zhao Y , Gu X , Mao Z , Zeng Q , Chen H , Martyniuk CJ
Ref : Ecotoxicology & Environmental Safety , 208 :111700 , 2021
Abstract : Sertraline (SER) is one of the most frequently detected antidepressant drugs in aquatic environments. However, knowledge regarding SER-induced behavioral alterations in fish is insufficient, as well as the mechanisms underlying SER-induced toxicity. The present study aimed to determine behavioral and molecular responses in larval fish following SER exposure with a focus on its mode of action. Zebrafish embryos (~6 h-post-fertilization, hpf) were exposed to one of three concentrations of SER (1, 10, 100 microg/L) for 6 days, respectively. Evaluated parameters included development, behavior, transcripts related to serotonin signaling, serotonin levels, and acetylcholinesterase activity. Accelerated hatching of zebrafish embryos was observed for those fish exposed to 100 microg/L SER at 54 hpf. Locomotor activity (e.g. distance moved and mobile cumulative duration) was significantly reduced in larval zebrafish following exposure to 10 and 100 microg/L SER. Conversely, larval fish showed increased dark-avoidance after exposure to 1-100 microg/L SER. Of the measured transcripts related to serotonin signaling, only serotonin transporter (serta) and serotonin receptor 2c (5-ht2c) mRNA levels were increased in fish in response to 10 microg/L SER treatment. However, serotonin levels were unaltered in larvae exposed to SER. There were no differences among groups in acetylcholinesterase activity at any concentration tested. Taking together, the results evidenced that exposure to SER alters behavioral responses in early-staged zebrafish, which may be related to the abnormal expression of 5-ht2c. This study elucidates molecular responses to SER and characterizes targets that may be sensitive to antidepressant pharmaceuticals in larval fish.
ESTHER : Yang_2021_Ecotoxicol.Environ.Saf_208_111700
PubMedSearch : Yang_2021_Ecotoxicol.Environ.Saf_208_111700
PubMedID: 33396031

Title : Environmentally relevant concentrations of sertraline disrupts behavior and the brain and liver transcriptome of juvenile yellow catfish (Tachysurus fulvidraco): Implications for the feeding and growth axis - Chen_2020_J.Hazard.Mater_409_124974
Author(s) : Chen H , Liang X , Gu X , Zeng Q , Mao Z , Martyniuk CJ
Ref : J Hazard Mater , 409 :124974 , 2020
Abstract : Sertraline (SER) is one of the most prevalent antidepressants detected in aquatic environments, but its impact on fish behavior and growth remain poorly understood. As such, behavior and growth were assessed in yellow catfish (Tachysurus fulvidraco) following SER exposure. SER induced shoaling, reduced food consumption and growth, and increased cannibalism at environmentally relevant concentrations. To ascertain toxicity mechanisms, acetylcholinesterase (AChE) activity and transcripts related to growth and feeding were measured. AChE activity was increased in fish exposed to 10 and 100 microg/L SER. Transcript levels of neuropeptide Y, somatostatin, growth hormone, and insulin growth factor 1 were reduced in the brain following SER exposure. RNA-seq conducted in brain and liver revealed that gene networks associated with feeding and growth (i.e. leptin expression networks in the brain and insulin signaling pathways in the liver) were altered, proposed to be associated with the decreased food intake and growth. The brain also accumulated SER, which may relate to neurobehavioral responses. Lastly, the main metabolite of SER, norsertraline, was detected in the liver, and may also relate to toxicity. This study uncovers mechanisms and key events proposed to lead to impaired behavior and growth after exposure to some antidepressants.
ESTHER : Chen_2020_J.Hazard.Mater_409_124974
PubMedSearch : Chen_2020_J.Hazard.Mater_409_124974
PubMedID: 33450510

Title : Dibenzo-alpha-pyrones: a new class of larvicidal metabolites against Aedes aegypti from the endophytic fungus Hyalodendriella sp. Ponipodef12 - Mao_2017_Pest.Manag.Sci_73_1478
Author(s) : Mao Z , Lai D , Liu X , Fu X , Meng J , Wang A , Wang X , Sun W , Liu ZL , Zhou L , Liu Y
Ref : Pest Manag Sci , 73 :1478 , 2017
Abstract : BACKGROUND: In our search for new agrochemicals from endophytic fungi, the crude extract of the endophytic Hyalodendriella sp. Ponipodef12 associated with the hybrid 'Neva' of Populus deltoides Marsh x P. nigra L. was found to possess larvicidal activity against Aedes aegypti.
RESULTS: Fractionation of the extract has led to the isolation of 11 dibenzo-alpha-pyrones (1-11), including three new congeners: hyalodendriols A-C (1-3). The structures of the new compounds were elucidated by comprehensive spectroscopic analyses, including the modified Mosher's method for the assignment of the absolute configuration. Compounds 2-7 showed potent larvicidal activities against the fourth-instar larvae of A. aegypti with IC50 values ranging from 7.21 to 120.81 microg mL-1 . Among them, penicilliumolide D (6) displayed the strongest activity (IC50 = 7.21 microg mL-1 ). A structure-larvicidal activity relationship was discussed. The possible mode of action of these compounds was assessed for their acetylcholinesterase inhibitory activities. In addition, hyalodendriol C (3) displayed antibacterial activity against Bacillus subtilis and Xanthomonas vesicatoria, and exhibited strong inhibition against the spore germination of Magnaporthe oryzae. CONCLUSION: Our study revealed dibenzo-alpha-pyrones to be a new class of larvicidal metabolites against A. aegypti. (c) 2016 Society of Chemical Industry.
ESTHER : Mao_2017_Pest.Manag.Sci_73_1478
PubMedSearch : Mao_2017_Pest.Manag.Sci_73_1478
PubMedID: 27862895

Title : The asparagus genome sheds light on the origin and evolution of a young Y chromosome - Harkess_2017_Nat.Commun_8_1279
Author(s) : Harkess A , Zhou J , Xu C , Bowers JE , Van der Hulst R , Ayyampalayam S , Mercati F , Riccardi P , McKain MR , Kakrana A , Tang H , Ray J , Groenendijk J , Arikit S , Mathioni SM , Nakano M , Shan H , Telgmann-Rauber A , Kanno A , Yue Z , Chen H , Li W , Chen Y , Xu X , Zhang Y , Luo S , Gao J , Mao Z , Pires JC , Luo M , Kudrna D , Wing RA , Meyers BC , Yi K , Kong H , Lavrijsen P , Sunseri F , Falavigna A , Ye Y , Leebens-Mack JH , Chen G
Ref : Nat Commun , 8 :1279 , 2017
Abstract : Sex chromosomes evolved from autosomes many times across the eukaryote phylogeny. Several models have been proposed to explain this transition, some involving male and female sterility mutations linked in a region of suppressed recombination between X and Y (or Z/W, U/V) chromosomes. Comparative and experimental analysis of a reference genome assembly for a double haploid YY male garden asparagus (Asparagus officinalis L.) individual implicates separate but linked genes as responsible for sex determination. Dioecy has evolved recently within Asparagus and sex chromosomes are cytogenetically identical with the Y, harboring a megabase segment that is missing from the X. We show that deletion of this entire region results in a male-to-female conversion, whereas loss of a single suppressor of female development drives male-to-hermaphrodite conversion. A single copy anther-specific gene with a male sterile Arabidopsis knockout phenotype is also in the Y-specific region, supporting a two-gene model for sex chromosome evolution.
ESTHER : Harkess_2017_Nat.Commun_8_1279
PubMedSearch : Harkess_2017_Nat.Commun_8_1279
PubMedID: 29093472
Gene_locus related to this paper: aspof-a0a5p1ew48

Title : Biosynthesis of Antibiotic Leucinostatins in Bio-control Fungus Purpureocillium lilacinum and Their Inhibition on Phytophthora Revealed by Genome Mining - Wang_2016_PLoS.Pathog_12_e1005685
Author(s) : Wang G , Liu Z , Lin R , Li E , Mao Z , Ling J , Yang Y , Yin WB , Xie B
Ref : PLoS Pathog , 12 :e1005685 , 2016
Abstract : Purpureocillium lilacinum of Ophiocordycipitaceae is one of the most promising and commercialized agents for controlling plant parasitic nematodes, as well as other insects and plant pathogens. However, how the fungus functions at the molecular level remains unknown. Here, we sequenced two isolates (PLBJ-1 and PLFJ-1) of P. lilacinum from different places Beijing and Fujian. Genomic analysis showed high synteny of the two isolates, and the phylogenetic analysis indicated they were most related to the insect pathogen Tolypocladium inflatum. A comparison with other species revealed that this fungus was enriched in carbohydrate-active enzymes (CAZymes), proteases and pathogenesis related genes. Whole genome search revealed a rich repertoire of secondary metabolites (SMs) encoding genes. The non-ribosomal peptide synthetase LcsA, which is comprised of ten C-A-PCP modules, was identified as the core biosynthetic gene of lipopeptide leucinostatins, which was specific to P. lilacinum and T. ophioglossoides, as confirmed by phylogenetic analysis. Furthermore, gene expression level was analyzed when PLBJ-1 was grown in leucinostatin-inducing and non-inducing medium, and 20 genes involved in the biosynthesis of leucionostatins were identified. Disruption mutants allowed us to propose a putative biosynthetic pathway of leucinostatin A. Moreover, overexpression of the transcription factor lcsF increased the production (1.5-fold) of leucinostatins A and B compared to wild type. Bioassays explored a new bioactivity of leucinostatins and P. lilacinum: inhibiting the growth of Phytophthora infestans and P. capsici. These results contribute to our understanding of the biosynthetic mechanism of leucinostatins and may allow us to utilize P. lilacinum better as bio-control agent.
ESTHER : Wang_2016_PLoS.Pathog_12_e1005685
PubMedSearch : Wang_2016_PLoS.Pathog_12_e1005685
PubMedID: 27416025
Gene_locus related to this paper: metcm-a0a179g1m3 , metcm-a0a179g2w0 , metcm-a0a4q7js68 , purli-lcse

Title : Fluoxetine reduces CES1, CES2, and CYP3A4 expression through decreasing PXR and increasing DEC1 in HepG2 cells - Shang_2016_Xenobiotica_46_393
Author(s) : Shang W , Liu J , Chen R , Ning R , Xiong J , Liu W , Mao Z , Hu G , Yang J
Ref : Xenobiotica , 46 :393 , 2016
Abstract : 1. This study investigated the mechanisms of the decreases of carboxylesterases (CES) and cytochrome P4503A4 (CYP3A4) and the enzymatic activities induced by fluoxetine (FLX) in HepG2 cells. We found that FLX decreased the carboxylesterase 1 (CES1) and carboxylesterase 2 (CES2) expression and the hydrolytic activity. 2. FLX decreased the pregnane X receptor (PXR) expression which regulated the target genes such as CYP3A4, whereas increased the differentiated embryonic chondrocyte-expressed gene 1 (DEC1) expression. 3. FLX repressed the PXR at transcriptional level. 4. Overexpression of PXR alone increased the expression of CES1, CES2, and CYP3A4 and attenuated the decreases of CES1, CES2, and CYP3A4 induced by FLX. On the contrary, knockdown of PXR alone decreased the expression of CES1, CES2, and CYP3A4 and almost abolished the decreases of CES1, CES2, and CYP3A4 induced by FLX. 5. Knockdown of DEC1 alone increased the expression of PXR and CYP3A4 and almost abolished the decreases of CES1, CES2, and CYP3A4 induced by FLX. 6. Taken together, the decreases of CES and CYP3A4 expression and enzymatic activities induced by FLX are through decreasing PXR and increasing DEC1 in HepG2 cells.
ESTHER : Shang_2016_Xenobiotica_46_393
PubMedSearch : Shang_2016_Xenobiotica_46_393
PubMedID: 26340669
Gene_locus related to this paper: human-CES1

Title : Separation and purification of bioactive botrallin and TMC-264 by a combination of HSCCC and semi-preparative HPLC from endophytic fungus Hyalodendriella sp. Ponipodef12 - Mao_2014_World.J.Microbiol.Biotechnol_30_2533
Author(s) : Mao Z , Luo R , Luo H , Tian J , Liu H , Yue Y , Wang M , Peng Y , Zhou L
Ref : World J Microbiol Biotechnol , 30 :2533 , 2014
Abstract : Two dibenzo-alpha-pyrones, botrallin (1) and TMC-264 (2) were preparatively separated from crude ethyl acetate extract of the endophytic fungus Hyalodendriella sp. Ponipodef12, which was isolated from the hybrid 'Neva' of Populus deltoides Marsh x P. nigra L. using a combination of high-speed counter-current chromatography (HSCCC) and semi-preparative HPLC. Botrallin (1) with 74.73 % of purity and TMC-264 (2) with 82.29 % of purity were obtained through HSCCC by employing a solvent system containing n-hexane-ethyl acetate-methanol-water at a volume ratio of 1.2:1.0:0.9:1.0. It was the first time for TMC-264 (2) to be isolated from this fungus. TMC-264 (2) showed strong antimicrobial and antinematodal activity, and botrallin (1) exhibited moderate inhibitory activity on acetylcholinesterase.
ESTHER : Mao_2014_World.J.Microbiol.Biotechnol_30_2533
PubMedSearch : Mao_2014_World.J.Microbiol.Biotechnol_30_2533
PubMedID: 24898177

Title : Natural Dibenzo-alpha-Pyrones and Their Bioactivities - Mao_2014_Molecules_19_5088
Author(s) : Mao Z , Sun W , Fu L , Luo H , Lai D , Zhou L
Ref : Molecules , 19 :5088 , 2014
Abstract : Natural dibenzo-alpha-pyrones are an important group of metabolites derived from fungi, mycobionts, plants and animal feces. They exhibit a variety of biological activities such as toxicity on human and animals, phytotoxicity as well as cytotoxic, antioxidant, antiallergic, antimicrobial, antinematodal, and acetylcholinesterase inhibitory properties. Dibenzo-alpha-pyrones are biosynthesized via the polyketide pathway in microorganisms or metabolized from plant-derived ellagitannins and ellagic acid by intestinal bacteria. At least 53 dibenzo-alpha-pyrones have been reported in the past few decades. This mini-review aims to briefly summarize the occurrence, biosynthesis, biotransformation, as well as their biological activities and functions. Some considerations related to synthesis, production and applications of dibenzo-alpha-pyrones are also discussed.
ESTHER : Mao_2014_Molecules_19_5088
PubMedSearch : Mao_2014_Molecules_19_5088
PubMedID: 24759070

Title : The interaction between OsMADS57 and OsTB1 modulates rice tillering via DWARF14 - Guo_2013_Nat.Commun_4_1566
Author(s) : Guo S , Xu Y , Liu H , Mao Z , Zhang C , Ma Y , Zhang Q , Meng Z , Chong K
Ref : Nat Commun , 4 :1566 , 2013
Abstract : Rice tillering is a multigenic trait that influences grain yield, but its regulation molecular module is poorly understood. Here we report that OsMADS57 interacts with OsTB1 (TEOSINTE BRANCHED1) and targets D14 (Dwarf14) to control the outgrowth of axillary buds in rice. An activation-tagged mutant osmads57-1 and OsMADS57-overexpression lines showed increased tillers, whereas OsMADS57 antisense lines had fewer tillers. OsMIR444a-overexpressing lines exhibited suppressed OsMADS57 expression and tillering. Furthermore, osmads57-1 was insensitive to strigolactone treatment to inhibit axillary bud outgrowth, and OsMADS57's function in tillering was dependent on D14. D14 expression was downregulated in osmads57-1, but upregulated in antisense and OsMIR444a-overexpressing lines. OsMADS57 bound to the CArG motif [C(A/T)TTAAAAAG] in the promoter and directly suppressed D14 expression. Interaction of OsMADS57 with OsTB1 reduced OsMADS57 inhibition of D14 transcription. Therefore, OsMIR444a-regulated OsMADS57, together with OsTB1, target D14 to control tillering. This regulation mechanism could have important application in rice molecular breeding programs focused on high grain yield.
ESTHER : Guo_2013_Nat.Commun_4_1566
PubMedSearch : Guo_2013_Nat.Commun_4_1566
PubMedID: 23463009

Title : Genome Sequencing of Bacillus subtilis Strain XF-1 with High Efficiency in the Suppression of Plasmodiophora brassicae - Guo_2013_Genome.Announc_1_e0006613
Author(s) : Guo S , Mao Z , Wu Y , Hao K , He P , He Y
Ref : Genome Announc , 1 :e0006613 , 2013
Abstract : The genome of the rhizobacterium Bacillus subtilis XF-1 is 4.06 Mb in size and harbors 3,853 coding sequences (CDS). Giant gene clusters were dedicated to the nonribosomal synthesis of antimicrobial lipopeptides and polyketides. Remarkably, XF-1 possesses a gene cluster involved in the synthesis of chitosanase that is related to the suppression of the pathogen Plasmodiophora brassicae.
ESTHER : Guo_2013_Genome.Announc_1_e0006613
PubMedSearch : Guo_2013_Genome.Announc_1_e0006613
PubMedID: 23558530
Gene_locus related to this paper: bacsu-pnbae , bacsu-YVAK

Title : Draft Genome Sequence of Pseudomonas plecoglossicida Strain NB2011, the Causative Agent of White Nodules in Large Yellow Croaker (Larimichthys crocea) - Mao_2013_Genome.Announc_1_e00586
Author(s) : Mao Z , Li M , Chen J
Ref : Genome Announc , 1 : , 2013
Abstract : We describe the draft genome sequence of Pseudomonas plecoglossicida strain NB2011, the causative agent of white nodules in cultured large yellow croaker (Larimichthys crocea) in China. The draft genome sequence of the bacterium consists of 5.41 million bp, with a G+C content of 62.8%. A total of 4,952 genes were identified.
ESTHER : Mao_2013_Genome.Announc_1_e00586
PubMedSearch : Mao_2013_Genome.Announc_1_e00586
PubMedID: 23929479
Gene_locus related to this paper: 9psed-s2k464 , psepu-PIP , 9psed-s2k0h8 , 9psed-s2jxx1 , 9psed-s2kmi2

Title : The genome of plant growth-promoting Bacillus amyloliquefaciens subsp. plantarum strain YAU B9601-Y2 contains a gene cluster for mersacidin synthesis - Hao_2012_J.Bacteriol_194_3264
Author(s) : Hao K , He P , Blom J , Rueckert C , Mao Z , Wu Y , He Y , Borriss R
Ref : Journal of Bacteriology , 194 :3264 , 2012
Abstract : The genome of rhizobacterium Bacillus amyloliquefaciens subsp. plantarum YAU B9601-Y2 was 4.24 Mb in size and harbored 3,991 coding sequences (CDS). Giant gene clusters were dedicated to nonribosomal synthesis of antimicrobial lipopeptides and polyketides. Remarkably, CAU B946 possessed a gene cluster involved in synthesis of mersacidin.
ESTHER : Hao_2012_J.Bacteriol_194_3264
PubMedSearch : Hao_2012_J.Bacteriol_194_3264
PubMedID: 22628498
Gene_locus related to this paper: baca2-a7z811

Title : Genome sequence of the plant growth promoting strain Bacillus amyloliquefaciens subsp. plantarum B9601-Y2 and expression of mersacidin and other secondary metabolites - He_2012_J.Biotechnol_164_281
Author(s) : He P , Hao K , Blom J , Ruckert C , Vater J , Mao Z , Wu Y , Hou M , He Y , Borriss R
Ref : J Biotechnol , 164 :281 , 2012
Abstract : The plant-associated Bacillus amyloliquefaciens subsp. plantarum strain B9601-Y2, isolated from wheat rhizosphere, is a powerful plant growth-promoting rhizobacterium. Its relative large genome size of 4.24Mbp, exceeding that of other representatives of the B. amyloliquefaciens subsp. plantarum taxon, is mainly due to the presence of 18 DNA-islands containing remnants of phages, a unique restriction modification system, a gene cluster for mersacidin synthesis, and an orphan gene cluster devoted to non-ribosomal synthesis of an unidentified peptide. Like other members of the taxon, the Y2 genome contains giant gene clusters for non-ribosomal synthesis of the polyketides macrolactin, difficidin, and bacillaene, the antifungal lipopeptides bacillomycin D, and fengycin, the siderophore bacillibactin, and the dipeptide bacilysin. A gene cluster encoding enzymes for a degradative pathway with 2-keto-3-deoxygluconate and 2-keto-3-deoxy-phosphogluconate as intermediates was explored by genome mining and found as being a unique feature for representatives of the plantarum subspecies. A survey of the Y2 genome against other B. amyloliquefaciens genomes revealed 130 genes only occurring in subsp. plantarum but not in subsp. amyloliquefaciens. Notably, the surfactin gene cluster is not functional due to a large deletion removing parts of the Srf synthetases B and C. Expression of polyketides, lipopeptides, mersacidin, and of the growth hormone indole-3-acetic acid in Y2 was demonstrated by matrix-assisted laser desorption ionization-time of flight mass spectroscopy and high-performance liquid chromatography, respectively.
ESTHER : He_2012_J.Biotechnol_164_281
PubMedSearch : He_2012_J.Biotechnol_164_281
PubMedID: 23357245
Gene_locus related to this paper: baca2-a7z924 , bacsu-YVAK

Title : Benzopyranones from the endophytic fungus Hyalodendriella sp. Ponipodef12 and their bioactivities - Meng_2012_Molecules_17_11303
Author(s) : Meng X , Mao Z , Lou J , Xu L , Zhong L , Peng Y , Zhou L , Wang M
Ref : Molecules , 17 :11303 , 2012
Abstract : The endophytic fungus Hyalodendriella sp. Ponipodef12 was isolated from the hybrid 'Neva' of Populus deltoides Marsh x P. nigra L. In this study, four benzopyranones were isolated from the ethyl acetate extract of Hyalodendriella sp. Ponipodef12, and identified as palmariol B (1), 4-hydroxymellein (2), alternariol 9-methyl ether (3), and botrallin (4) by means of physicochemical and spectroscopic analysis. All the compounds were evaluated for their antibacterial, antifungal, antinematodal and acetylcholinesterase inhibitory activities. 4-Hydroxymellein (2) exhibited stronger antibacterial activity than the other compounds. Palmariol B (1) showed stronger antimicrobial, antinematodal and acetylcholinesterase inhibitory activities than alternariol 9-methyl ether (3) which indicated that the chlorine substitution at position 2 may contribute to its bioactivity. The results indicate the potential of this endophytic fungus as a source of bioactive benzopyranones.
ESTHER : Meng_2012_Molecules_17_11303
PubMedSearch : Meng_2012_Molecules_17_11303
PubMedID: 23011274

Title : Activation of transcription factor MEF2D by bis(3)-cognitin protects dopaminergic neurons and ameliorates Parkinsonian motor defects - Yao_2012_J.Biol.Chem_287_34246
Author(s) : Yao L , Li W , She H , Dou J , Jia L , He Y , Yang Q , Zhu J , Capiro NL , Walker DI , Pennell KD , Pang Y , Liu Y , Han Y , Mao Z
Ref : Journal of Biological Chemistry , 287 :34246 , 2012
Abstract : Parkinson disease (PD) is characterized by the selective demise of dopaminergic (DA) neurons in the substantial nigra pars compacta. Dysregulation of transcriptional factor myocyte enhancer factor 2D (MEF2D) has been implicated in the pathogenic process in in vivo and in vitro models of PD. Here, we identified a small molecule bis(3)-cognitin (B3C) as a potent activator of MEF2D. We showed that B3C attenuated the toxic effects of neurotoxin 1-methyl-4-phenylpyridinium (MPP(+)) by activating MEF2D via multiple mechanisms. B3C significantly reduced MPP(+)-induced oxidative stress and potentiated Akt to down-regulate the activity of MEF2 inhibitor glycogen synthase kinase 3beta (GSK3beta) in a DA neuronal cell line SN4741. Furthermore, B3C effectively rescued MEF2D from MPP(+)-induced decline in both nucleic and mitochondrial compartments. B3C offered SN4741 cells potent protection against MPP(+)-induced apoptosis via MEF2D. Interestingly, B3C also protected SN4741 cells from wild type or mutant A53T alpha-synuclein-induced cytotoxicity. Using the in vivo PD model of C57BL/6 mice treated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine hydrochloride (MPTP), we showed that B3C maintained redox homeostasis, promoted Akt function activity, and restored MEF2D level in midbrain neurons. Moreover, B3C greatly prevented the loss of tyrosine hydroxylase signal in substantial nigra pars compacta DA neurons and ameliorated behavioral impairments in mice treated with MPTP. Collectedly, our studies identified B3C as a potent neuroprotective agent whose effectiveness relies on its ability to effectively up-regulate MEF2D in DA neurons against toxic stress in models of PD in vitro and in vivo.
ESTHER : Yao_2012_J.Biol.Chem_287_34246
PubMedSearch : Yao_2012_J.Biol.Chem_287_34246
PubMedID: 22891246

Title : Lipopolysaccharide down-regulates carbolesterases 1 and 2 and reduces hydrolysis activity in vitro and in vivo via p38MAPK-NF-kappaB pathway - Mao_2011_Toxicol.Lett_201_213
Author(s) : Mao Z , Li Y , Peng Y , Luan X , Gui H , Feng X , Hu G , Shen J , Yan B , Yang J
Ref : Toxicol Lett , 201 :213 , 2011
Abstract : Carboxylesterases constitute a class of enzymes that hydrolyze drugs containing such functional groups as carboxylic acid ester, amide, and thioester. Hydrolysis of many drugs is reduced in liver diseases such as hepatitis and cirrhosis. In this study, we have demonstrated, in vitro and in vivo, treatment with LPS decreased the expression of HCE1 and HCE2 and the capacity of hydrolytic activity. In HepG2 cells, the decreased expression by LPS occurred at both mRNA and protein levels. Both HCE1 and HCE2 promoters were significantly repressed by LPS, and the repression was comparable with the decrease in HCE1 and HCE2 mRNA, suggesting the transrepression is responsible for suppressed expression. Further study showed that both PDTC, a NF-B inhibitor, and SB203580, a p38MAPK inhibitor, could abolish the repression of HCE1 and HCE2 mediated by LPS, but U0126, a selective ERK1/2 inhibitor, could not do so, suggesting the repression of HCE1 and HCE2 by LPS through the p38MAPK-NF-B pathway. In addition, being pretreated with LPS, HepG2 cells altered the cellular responsiveness to ester therapeutic agents, including clopidogrel (hydrolyzed by HCE1) and irinotecan (hydrolyzed by HCE2). The altered cellular responsiveness occurred at low micromolar concentrations, suggesting that suppressed expression of carboxylesterases by LPS has profound pharmacological and toxicological consequences, particularly with those that are hydrolyzed in an isoform-specific manner. This study provides new insight into the understanding of the pharmacological and toxicological effects and the mechanisms for repressing drug metabolism enzymes in inflammation.
ESTHER : Mao_2011_Toxicol.Lett_201_213
PubMedSearch : Mao_2011_Toxicol.Lett_201_213
PubMedID: 21237253

Title : Population pharmacokinetic-pharmacodynamic analysis of vernakalant hydrochloride injection (RSD1235) in atrial fibrillation or atrial flutter - Mao_2011_J.Pharmacokinet.Pharmacodyn_38_541
Author(s) : Mao Z , Wheeler JJ , Townsend R , Gao Y , Kshirsagar S , Keirns JJ
Ref : J Pharmacokinet Pharmacodyn , 38 :541 , 2011
Abstract : Vernakalant hydrochloride is a novel, relatively atrial-selective antiarrhythmic agent that rapidly converts atrial fibrillation (AF) to sinus rhythm (SR). This analysis integrates pharmacokinetic (PK) and safety data from 5 clinical trials of patients with AF or atrial flutter (AFL). Patients were initially given a 10-min intravenous (IV) infusion of vernakalant 3 mg/kg or placebo. If SR was not evident after a 15-min observation, then a second 10-min IV infusion of vernakalant 2 mg/kg or placebo was given. Population pharmacokinetic/pharmacodynamic (PK/PD) models were constructed for QT interval prolongation corrected for heart rate by Fridericia's formula (QTcF) and for changes in systolic blood pressure (SBP). The exposure-response relationships for QTcF and SBP were best described by sigmoidal maximum-effect (E (max)) models. For QTcF, the model was characterized by a typical E (max) of 20.3 ms, and by a vernakalant median effective concentration dependent (EC(5)(0)) on conversion status (4,222 ng/ml for patients converting to SR and 2,276 ng/ml for those remaining in AF/AFL). For SBP, the model was characterized by E (max) of 3.05 mmHg and EC(5)(0) of 1,141 ng/ml. Risk of hypotension (SBP <90 mmHg) was primarily associated with low baseline SBP and to a smaller extent with a history of congestive heart failure (CHF); plasma vernakalant concentrations showed a small contribution to the risk of hypotension (relative risk = 1.4 at 4,000 ng/ml), which may be significant with a baseline SBP of <105 mmHg. These results show that vernakalant had a smaller effect on QTcF in patients who demonstrated conversion to SR than those remaining in AF or AFL, and it had a relatively small effect on SBP.
ESTHER : Mao_2011_J.Pharmacokinet.Pharmacodyn_38_541
PubMedSearch : Mao_2011_J.Pharmacokinet.Pharmacodyn_38_541
PubMedID: 21786177