Feng T

References (11)

Title : Lipase in-situ immobilized in covalent organic framework: Enzymatic properties and application in the preparation of 1, 3-dioleoyl-2-palmitoylglycerol - Feng_2024_Colloids.Surf.B.Biointerfaces_238_113873
Author(s) : Feng T , Shi J , Xia J , Ren X , Adesanya OI , Suo H , Zou B
Ref : Colloids Surf B Biointerfaces , 238 :113873 , 2024
Abstract : In this study, the critical importance of designing an appropriate immobilized carrier and method for free lipase to ensure exceptional biological catalytic activity and stability was emphasized. Covalent organic frameworks (COF-1) were synthesized as a novel porous carrier with an azine structure (-CN-NC-) through the condensation of hydrazine hydrate and benzene-1,3,5-tricarbaldehyde at room temperature. Simultaneously, Rhizomucor miehei lipase (RML) was immobilized within the COF-1 carrier using an in-situ aqueous phase method. Characterization of the carrier and RML@COF-1 and evaluation of the lipase properties of RML and RML@COF-1 through p-Nitrophenyl palmitate hydrolysis were conducted. Additionally, application in the synthesis of 1, 3-dioleoyl-2-palmitoylglycerol (OPO) was explored. The results showed that RML@COF-1 exhibited a high enzymatic loading of 285.4 mg/g. Under 60 degC conditions, the activity of RML@COF-1 was 2.31 times higher than that of free RML, and RML@COF-1 retained 77.25% of its original activity after 10 cycles of repeated use, indicating its excellent thermal stability and repeatability. Under the optimal conditions (10%, 1:8 PPP/OA, 45 degC, 5 h), the yield of OPO reached 47.35%, showcasing the promising application prospects of the novel immobilized enzyme synthesized via in-situ aqueous phase synthesis for OPO preparation.
ESTHER : Feng_2024_Colloids.Surf.B.Biointerfaces_238_113873
PubMedSearch : Feng_2024_Colloids.Surf.B.Biointerfaces_238_113873
PubMedID: 38552410

Title : DPP9 Stabilizes NRF2 to Suppress Ferroptosis and Induce Sorafenib Resistance in Clear Cell Renal Cell Carcinoma - Chang_2023_Cancer.Res__
Author(s) : Chang K , Chen Y , Zhang X , Zhang W , Xu N , Zeng B , Wang Y , Feng T , Dai B , Xu F , Ye D , Wang C
Ref : Cancer Research , : , 2023
Abstract : The KEAP1-NRF2 axis is the principal regulator of cellular responses to oxidative and electrophilic stressors. NRF2 hyperactivation is frequently observed in many types of cancer and promotes cancer initiation, progression, metastasis, and resistance to various therapies. Here, we determined that dipeptidyl peptidase 9 (DPP9) is a regulator of the KEAP1-NRF2 pathway in clear cell renal cell carcinoma (ccRCC). DPP9 was markedly overexpressed at the mRNA and protein levels in ccRCC, and high DPP9 expression levels correlated with advanced tumor stage and poor prognosis in ccRCC patients. Protein affinity purification to identify functional partners of DPP9 revealed that it bound to KEAP1 via a conserved ESGE motif. DPP9 disrupted KEAP1-NRF2 binding by competing with NRF2 for binding to KEAP1 in an enzyme-independent manner. Upregulation of DPP9 led to stabilization of NRF2, driving NRF2-dependent transcription and thereby decreasing cellular reactive oxygen species (ROS) levels. Moreover, DPP9 overexpression suppressed ferroptosis and induced resistance to sorafenib in ccRCC cells, which was largely dependent on the NRF2 transcriptional target SLC7A11. Collectively, these findings indicate that the accumulation of DPP9 results in hyperactivation of the NRF2 pathway to promote tumorigenesis and intrinsic drug resistance in ccRCC.
ESTHER : Chang_2023_Cancer.Res__
PubMedSearch : Chang_2023_Cancer.Res__
PubMedID: 37713596
Gene_locus related to this paper: human-DPP9

Title : Dipeptidyl peptidase-4 inhibitors alleviate cognitive dysfunction in type 2 diabetes mellitus - Meng_2023_Lipids.Health.Dis_22_219
Author(s) : Meng J , Yan R , Zhang C , Bai X , Yang X , Yang Y , Feng T , Liu X
Ref : Lipids Health Dis , 22 :219 , 2023
Abstract : BACKGROUND: Patients with type 2 diabetes mellitus (T2DM) are commonly at high risk for developing cognitive dysfunction. Antidiabetic agents might be repurposed for targeting cognitive dysfunction in addition to modulation on glucose homeostasis. This study aimed to evaluate the impact of dipeptidyl peptidase-4 inhibitors (DPP-4i) on cognitive function in T2DM. METHODS: PubMed, Embase, Cochrane Library and Web of Science were systematically searched from inception to September 30, 2023. Weighted mean differences were calculated using the Mantel-Haenszel (M-H) fixed or random effects model based on the degree of heterogeneity among studies. Heterogeneity was evaluated using a Chi-squared test and quantified with Higgins I(2). Sensitivity analysis was performed with the leave-one-out method, and publication bias was evaluated according to Begg's and Egger's tests. RESULTS: Six clinical trials involving 5,178 participants were included in the pooled analysis. Administration of DPP-4i generally correlated with an increase of Mini-Mental State Examination (MMSE) scores (1.09, 95% CI: 0.22 to 1.96). DPP-4i alleviated cognitive impairment in the copying skill subdomain of MMSE (0.26, 95% CI: 0.12 to 0.40). Treatment with DPP-4i also resulted in an increase of Instrumental Activities of Daily Living (IADL) scores (0.82, 95% CI: 0.30 to 1.34). However, DPP-4i produced no significant effects on Barthel Activities of Daily Living (BADL) scores (0.37, 95% CI: -1.26 to 1.99) or other test scores. CONCLUSIONS: DPP-4i treatment favourably improved cognitive function in patients with T2DM. Further trials with larger samples should be performed to confirm these estimates and investigate the association of different DPP-4i with cognitive function among diabetic patients. TRIAL REGISTRATION IN PROSPERO: CRD42023430873.
ESTHER : Meng_2023_Lipids.Health.Dis_22_219
PubMedSearch : Meng_2023_Lipids.Health.Dis_22_219
PubMedID: 38082288

Title : A Hydrolase-Catalyzed Cyclization Forms the Fused Bicyclic beta-Lactone in Vibralactone - Feng_2020_Angew.Chem.Int.Ed.Engl_59_7209
Author(s) : Feng KN , Yang YL , Xu YX , Zhang Y , Feng T , Huang SX , Liu JK , Zeng Y
Ref : Angew Chem Int Ed Engl , 59 :7209 , 2020
Abstract : Vibralactone is isolated from the basidiomycete fungus Boreostereum vibrans as one of the strongest lipase inhibitors. Its unusual beta-lactone-fused bicycle is derived from an aryl ring moiety via an oxidative ring-expansion prior to an intramolecular cyclization. Here, we report the discovery of the cyclase VibC which belongs to the alpha/beta-hydrolase superfamily and is involved in the vibralactone biosynthesis. Biochemical and crystal studies suggest that VibC may catalyze an aldol or an electrocyclic reaction initiated by the catalytic Ser-His-Asp triad. For the aldol and pericyclic chemistry in living cells, VibC is a unique hydrolase performing the carbocycle formation of an oxepinone to a fused bicyclic b-lactone. This presents a naturally occurring new enzyme reaction in both aldol and hydrolase (bio)chemistry that will guide future exploitation of these enzymes in synthetic biology for chemical diversity expansion of natural products.
ESTHER : Feng_2020_Angew.Chem.Int.Ed.Engl_59_7209
PubMedSearch : Feng_2020_Angew.Chem.Int.Ed.Engl_59_7209
PubMedID: 32050043
Gene_locus related to this paper: 9agam-VibC , stehr-Sh.112560

Title : Sixteen-Week Interventional Study to Evaluate the Clinical Effects and Safety of Rivastigmine Capsules in Chinese Patients with Alzheimer's Disease - Jia_2019_J.Alzheimers.Dis_72_1313
Author(s) : Jia J , Ji Y , Feng T , Ye Q , Peng D , Kuang W , Ning Y , Liang Z , Fan D , Wei W , Li Y , Xiao S
Ref : J Alzheimers Dis , 72 :1313 , 2019
Abstract : BACKGROUND: Rivastigmine is a cholinesterase inhibitor, approved for the treatment of mild-to-moderate dementia of Alzheimer's type. OBJECTIVE: To explore the efficacy and safety of the maximal tolerated dose of rivastigmine capsules in Chinese patients with mild-to-moderate Alzheimer's disease (AD). METHODS: The study was a multicenter, open-label, single-arm, phase IV clinical study in mild-to-moderate drug-naive AD patients treated with rivastigmine capsules. The primary endpoint was the changes in the total scores of Alzheimer's Disease Assessment Scale-Cognitive subscale (ADAS-Cog) from baseline to week 16. Secondary endpoints included changes in the scores of the following assessment scales and safety: Alzheimer's Disease Cooperative Study; Activities of Daily Living; Mini-Mental Status Examination (MMSE); Neuropsychiatry Index (NPI), and Caregiver Burden Inventory. RESULTS: 222 patients were enrolled. Of these, 136 (75.1%) patients received and maintained the effective dose (>/=6 mg/d) of rivastigmine for at least 4 weeks. The ADAS-Cog scale score improved in rivastigmine-treated patients at week 16 compared with baseline (p < 0.001) by 2.0 (95% CI: -3.0 to -1.1) points, which met the pre-defined superiority criteria. NPI-10 and NPI-12 scores improved by 3.6 and 4.0 points at week 16 (p = 0.001, p < 0.001), respectively. A total of 107 patients (59.1%) experienced adverse effects (AEs) during the study; common AEs included nausea (20.5%), vomiting (16.6%), anorexia (7.8%), dizziness (7.7%), and diarrhea (7.2%). CONCLUSION: This was the first phase IV study on rivastigmine in mainland China. The study preliminarily demonstrated that rivastigmine capsules showed good tolerability and efficacy in mild-to-moderate AD patients with the maximal tolerated dose.
ESTHER : Jia_2019_J.Alzheimers.Dis_72_1313
PubMedSearch : Jia_2019_J.Alzheimers.Dis_72_1313
PubMedID: 31744005

Title : N-Carbamoylmaleimide-treated carbon dots: stabilizing the electrochemical intermediate and extending it for the ultrasensitive detection of organophosphate pesticides - Xu_2018_Nanoscale_10_19390
Author(s) : Xu J , Yu C , Feng T , Liu M , Li F , Wang Y
Ref : Nanoscale , 10 :19390 , 2018
Abstract : To date, numerous methods have been reported for the detection of organophosphorus pesticides (OP) due to their severe potential hazard to the environment, public health and national security. However, very few works have ever found that the signal loss of thiocholine (TCh) during electrochemical processing is a key factor leading to the low sensitivity of acetylcholinesterase (AChE)-based OP electrochemical sensing platforms. Herein, we propose an ultrasensitive detection method for multiple OPs including parathion-methyl, paraoxon, dimethoate and O,O-dimethyl-O-2,2-dichlorovinyl-phosphate using N-carbamoylmaleimide-functionalized carbon dots (N-MAL-CDs) as a nano-stabilizer. For the first time, Michael addition is introduced into an AChE-based OP electrochemical sensing platform to enrich the electrochemical intermediate TCh. The Michael addition between TCh and N-MAL-CDs is demonstrated via XRD, FTIR, SEM and EDS elemental mapping experiments. Due to the stabilization and enhancement of TCh with N-MAL-CDs, the as prepared OP sensing platform achieves ultrahigh sensitivity by detecting the initial electrochemical signals of TCh without signal loss, showing a wide linear range of 3.8 x 10(-15)-3.8 x 10(-10) M for parathion-methyl and 1.8 x 10(-14)-3.6 x 10(-10) M for paraoxon, with a limit of detection of 1.4 x 10(-15) M for parathion-methyl and 4.8 x 10(-15) M for paraoxon.
ESTHER : Xu_2018_Nanoscale_10_19390
PubMedSearch : Xu_2018_Nanoscale_10_19390
PubMedID: 30307023

Title : Matsutakone and Matsutoic Acid, Two (Nor)steroids with Unusual Skeletons from the Edible Mushroom Tricholoma matsutake - Zhao_2017_J.Org.Chem_82_7974
Author(s) : Zhao ZZ , Chen HP , Wu B , Zhang L , Li ZH , Feng T , Liu JK
Ref : J Org Chem , 82 :7974 , 2017
Abstract : Matsutakone (1), a novel sterol with an unprecedented polycyclic ring system, together with a new norsteroid matsutoic acid (2) were isolated from the fruiting bodies of Tricholoma matsutake. Their structures and absolute configurations were assigned by extensive spectroscopic analyses and computational methods. Bioassay results showed that compounds 1 and 2 exhibited inhibitory activities against acetylcholinesterase (IC50 20.9 muM for 1).
ESTHER : Zhao_2017_J.Org.Chem_82_7974
PubMedSearch : Zhao_2017_J.Org.Chem_82_7974
PubMedID: 28691489

Title : Chronic Cerebral Hypoperfusion Accelerates Alzheimer's Disease Pathology with Cerebrovascular Remodeling in a Novel Mouse Model - Zhai_2016_J.Alzheimers.Dis_53_893
Author(s) : Zhai Y , Yamashita T , Nakano Y , Sun Z , Shang J , Feng T , Morihara R , Fukui Y , Ohta Y , Hishikawa N , Abe K
Ref : J Alzheimers Dis , 53 :893 , 2016
Abstract : Recently, aging societies have been showing an increasingly strong relationship between Alzheimer's disease (AD) and chronic cerebral hypoperfusion (HP). In the present study, we created a new mouse model for AD with HP, and investigated its clinical and pathological characteristics. Alzheimer's disease transgenic mice (APP23) were subjected to bilateral common carotid arteries stenosis with ameroid constrictors for slowly progressive cerebral HP. In contrast to simple APP23 mice, cerebral HP exacerbated motor and cognitive dysfunctions with white matter lesions and meningo-parenchymal amyloid-beta (Abeta) burdens. Strong cerebrovascular inflammation and severe amyloid angiopathy with cerebrovascular remodeling were also observed in APP23 + HP mouse brains. An acetylcholinesterase inhibitor galantamine improved such clinical dysfunctions, retrieved above neuropathological characteristics, and enhanced nicotinic acetylcholine receptor (nAChR)-binding activity. The present study demonstrates that chronic cerebral HP enhanced cognitive/motor dysfunctions with parenchymal/cerebrovascular Abeta accumulation and cerebrovascular remodeling. These neuropathological abnormalities were greatly ameliorated by galantamine treatment associated with nAChR-mediated neuroprotection by allosterically potentiating ligand action.
ESTHER : Zhai_2016_J.Alzheimers.Dis_53_893
PubMedSearch : Zhai_2016_J.Alzheimers.Dis_53_893
PubMedID: 27314529

Title : Novel Natural Oximes and Oxime Esters with a Vibralactone Backbone from the Basidiomycete Boreostereum vibrans - Chen_2016_ChemistryOpen_5_142
Author(s) : Chen HP , Zhao ZZ , Li ZH , Dong ZJ , Wei K , Bai X , Zhang L , Wen CN , Feng T , Liu JK
Ref : ChemistryOpen , 5 :142 , 2016
Abstract : A variety of novel natural products with significant bioactivities are produced by the basidiomycete Boreostereum vibrans. In the present study, we describe 16 novel natural oximes and oxime esters with a vibralactone backbone, vibralactoximes, which were isolated from the scale-up fermentation broth of B. vibrans. Their structures were determined through extensive spectroscopic analyses. These compounds represent the first oxime esters from nature. The hypothetical biosynthetic pathway of these compounds was also proposed. Seven compounds exhibited significant pancreatic lipase inhibitory activity, while ten compounds exhibited cytotoxicities against five human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7, and SW480), with IC50 values comparable with those of cisplatin.
ESTHER : Chen_2016_ChemistryOpen_5_142
PubMedSearch : Chen_2016_ChemistryOpen_5_142
PubMedID: 27308232

Title : Effects of trichlorfon and sodium dodecyl sulphate on antioxidant defense system and acetylcholinesterase of Tilapia nilotica in vitro - Feng_2008_Pestic.Biochem.Physiol_92_107
Author(s) : Feng T , Li ZB , Guo XQ , Guo JP
Ref : Pesticide Biochemistry and Physiology , 92 :107 , 2008
Abstract : The effects of organophosphorus insecticide trichlorfon, surfactant sodium dodecyl sulphate (SDS), and the mixture of trichlorfon and SDS on the antioxidant defense system and acetylcholinesterase (AChE) in Tilapia nilotica were assessed in vitro. Various concentrations of trichlorfon (0, 0.0001, 0.001, 0.01, 0.1 and 1 g/L) and SDS (0, 0.0625, 0.125, 0.25, 0.5, 1 g/L) were incubated with homogenate of liver and muscle, respectively, at 25 C for 0, 30, 60 and 90 min. Two concentrations of mixture of trichlorfon and SDS (0.0001 g/L trichlorfon + 0.5 g/L SDS, 0.1 g/L trichlorfon + 0.5 g/L SDS) and 0.0001 g/L trichlorfon, 0.1 g/L trichlorfon, 0.5 g/L SDS and control, were incubated simultaneously with homogenate of liver and muscle, respectively, at 25 C for 60 min. After incubation, the content of reduced-glutathione (GSH) and the activity of superoxide dismutase (SOD), catalase (CAT) and glutathione S-transferase (GST) in homogenate of liver were determined, and the activities of AChE in homogenate of muscle were also measured. Treatment with trichlorfon caused a significant concentration-dependent and time-related inhibition of AChE activity at all treatment concentrations and times since trichlorfon is a cholinesterase inhibitor. For the same trichlorfon treatment, an apparent decrease in GSH content was found in concentration of 0.01, 0.1, 1 g/L, whereas no significant alteration in antioxidant enzyme activity were found at all experiment concentrations and times, which might indicate that antioxidant enzymes have not involved in the metabolism of trichlorfon. The depletion of GSH might indicate that ROS could be involved in the toxic effects of trichlorfon. Exposure of SDS can inhibit activities of AChE, GST and CAT at concentrations of 0.5 and/or 1 g/L, which could be due to the denaturing process of SDS to the enzymes. For the mixture exposure of trichlorfon and SDS, the effect of the mixture of 0.0001 g/L trichlorfon and 0.5 g/L SDS on inhibition of AChE shows synergistic other than simple additive of trichlorfon and SDS. The combined effects of chemicals and detergents deserve to be particularly noted. It should be noted that the toxicity experiments were made in tissue homogenates instead of whole organisms. The responses against the toxic compounds will not be the same in both systems.
ESTHER : Feng_2008_Pestic.Biochem.Physiol_92_107
PubMedSearch : Feng_2008_Pestic.Biochem.Physiol_92_107
PubMedID:

Title : A glimpse of streptococcal toxic shock syndrome from comparative genomics of S. suis 2 Chinese isolates - Chen_2007_PLoS.One_2_e315
Author(s) : Chen C , Tang J , Dong W , Wang C , Feng Y , Wang J , Zheng F , Pan X , Liu D , Li M , Song Y , Zhu X , Sun H , Feng T , Guo Z , Ju A , Ge J , Dong Y , Sun W , Jiang Y , Yan J , Yang H , Wang X , Gao GF , Yang R , Yu J
Ref : PLoS ONE , 2 :e315 , 2007
Abstract : BACKGROUND: Streptococcus suis serotype 2 (SS2) is an important zoonotic pathogen, causing more than 200 cases of severe human infection worldwide, with the hallmarks of meningitis, septicemia, arthritis, etc. Very recently, SS2 has been recognized as an etiological agent for streptococcal toxic shock syndrome (STSS), which was originally associated with Streptococcus pyogenes (GAS) in Streptococci. However, the molecular mechanisms underlying STSS are poorly understood. METHODS AND FINDINGS: To elucidate the genetic determinants of STSS caused by SS2, whole genome sequencing of 3 different Chinese SS2 strains was undertaken. Comparative genomics accompanied by several lines of experiments, including experimental animal infection, PCR assay, and expression analysis, were utilized to further dissect a candidate pathogenicity island (PAI). Here we show, for the first time, a novel molecular insight into Chinese isolates of highly invasive SS2, which caused two large-scale human STSS outbreaks in China. A candidate PAI of approximately 89 kb in length, which is designated 89K and specific for Chinese SS2 virulent isolates, was investigated at the genomic level. It shares the universal properties of PAIs such as distinct GC content, consistent with its pivotal role in STSS and high virulence. CONCLUSIONS: To our knowledge, this is the first PAI candidate from S. suis worldwide. Our finding thus sheds light on STSS triggered by SS2 at the genomic level, facilitates further understanding of its pathogenesis and points to directions of development on some effective strategies to combat highly pathogenic SS2 infections.
ESTHER : Chen_2007_PLoS.One_2_e315
PubMedSearch : Chen_2007_PLoS.One_2_e315
PubMedID: 17375201
Gene_locus related to this paper: strsu-a4vws4 , strsu-q302y4 , strsy-a4vus4 , strsy-a4vwf6