Fan Q

References (6)

Title : Enhanced enzyme thermostability of a family I.3 lipase LipSR1 by T118A mutation at the calcium-binding site - Jiang_2023_Biotechnol.Lett__
Author(s) : Jiang S , Zhou Z , Han J , Fan Q , Long Z , Wang J
Ref : Biotechnol Lett , : , 2023
Abstract : OBJECTIVES: The lipase gene lipSR1 isolated from oil-contaminated soil exhibits high hydrolytic activity for short-chain fatty acid substrates. A single calcium ion is required to anchor the lid of LipSR1 in an open conformation by coordination with two aspartate residues and three other residues in the lid. The lid of LipSR1 is anchored by Ca(2+), which is coordinated by side-chain carboxyl oxygens of Asp153 and Asp157, carbonyl oxygens of Thr118 and Ser144, and the side chain of Gln120. RESULTS: D157A, D153R, Q120A, S144A, and T118A mutants were produced by site-directed mutagenesis in this study. Analyses of hydrolytic activity and thermostability showed that the properties of D157A, D153R, Q120A, and S144A were almost lost, suggesting that Asp157, Asp153, Gln120, and Ser144 are important residues for LipSR1. However, the catalytic performance of T118A was clearly maintained. Moreover, the thermostability of mutant T118A was higher than that of wild-type LipSR1. CONCLUSIONS: These results indicated that mutation of threonine at position 118 improved the stability of the enzyme at high temperature.
ESTHER : Jiang_2023_Biotechnol.Lett__
PubMedSearch : Jiang_2023_Biotechnol.Lett__
PubMedID: 37439931
Gene_locus related to this paper: lacac-q5fi30

Title : Adsorption mechanism of two pesticides on polyethylene and polypropylene microplastics: DFT calculations and particle size effects - Mo_2021_Environ.Pollut_291_118120
Author(s) : Mo Q , Yang X , Wang J , Xu H , Li W , Fan Q , Gao S , Yang W , Gao C , Liao D , Li Y , Zhang Y
Ref : Environ Pollut , 291 :118120 , 2021
Abstract : Polyethylene (PE) and polypropylene (PP) microplastics (MPs), as carriers, can bind with pesticides, which propose harmful impacts to aqueous ecosystems. Meanwhile, carbofuran and carbendazim (CBD), two widely used carbamate pesticides, are toxic to humans because of the inhibition of acetylcholinesterase activity. The interaction between two MPs and two pesticides could start in farmland and be maintained during transportation to the ocean. Herein, the adsorption behavior and mechanism of carbofuran and carbendazim (CBD) by PE and PP MPs were investigated via characterization and density functional theory (DFT) simulation. The adsorption kinetic and thermodynamic data were best described by pseudo-second-order kinetics and the Freundlich models. The adsorption behaviors of individual carbofuran/CBD on both MPs were very similar. The CBD adsorption rate and capacity of PE and PP MPs were higher than those of carbofuran. This phenomenon explained the lower negative effects of DOM (oxalic acid, glycine (Gly)) on CBD adsorption relative to those of carbofuran. The presence of oxalic acid and Gly decreased the PE adsorption by 20.40-48.02% and the PP adsorption by 19.27-42.11%, respectively. It indicated the significance of DOM in carbofuran cycling. The adsorption capacities were negatively correlated with MPs size, indicating the importance of specific surficial area. Fourier transformation infrared spectroscopy before and after adsorption suggested that the adsorption process did not produce any new covalent bond. Instead, intermolecular van der Waals forces were one of the primary adsorption mechanisms of carbofuran and CBD by MPs, as evidenced by DFT calculations. Based on the zeta potential, the electrostatic interaction explained the higher adsorption CBD by MPs than carbofuran.
ESTHER : Mo_2021_Environ.Pollut_291_118120
PubMedSearch : Mo_2021_Environ.Pollut_291_118120
PubMedID: 34520951

Title : Abnormal social behavior and altered gene expression in mice lacking NDRG2 - Takarada-Iemata_2021_Neurosci.Lett_743_135563
Author(s) : Takarada-Iemata M , Yoshihara T , Okitani N , Iwata K , Hattori T , Ishii H , Roboon J , Nguyen DT , Fan Q , Tamatani T , Nishiuchi T , Asano M , Hori O
Ref : Neuroscience Letters , 743 :135563 , 2021
Abstract : N-myc downstream-regulated gene 2 (NDRG2), a member of the NDRG family, has multiple functions in cell proliferation, differentiation, and stress responses, and is predominantly expressed by astrocytes in the central nervous system. Previous studies including ours demonstrated that NDRG2 is involved in various central nervous system pathologies. However, the significance of NDRG2 in neurodevelopment is not fully understood. Here, we investigated the expression profile of NDRG2 during postnatal brain development, the role of NDRG2 in social behavior, and transcriptome changes in the brain of NDRG2-deficient mice. NDRG2 expression in the brain increased over time from postnatal day 1 to adulthood. Deletion of NDRG2 resulted in abnormal social behavior, as indicated by reduced exploratory activity toward a novel mouse in a three-chamber social interaction test. Microarray analysis identified genes differentially expressed in the NDRG2-deficient brain, and upregulated gene expression of Bmp4 and Per2 was confirmed by quantitative PCR analysis. Expression of both these genes and the encoded proteins increased over time during postnatal brain development, similar to NDRG2. Gene expression of Bmp4 and Per2 was upregulated in cultured astrocytes isolated from NDRG2-deficient mice. These results suggest that NDRG2 contributes to brain development required for proper social behavior by modulating gene expression in astrocytes.
ESTHER : Takarada-Iemata_2021_Neurosci.Lett_743_135563
PubMedSearch : Takarada-Iemata_2021_Neurosci.Lett_743_135563
PubMedID: 33359046
Gene_locus related to this paper: human-NDRG2

Title : The Anti-inflammatory Effect of Soluble Epoxide Hydrolase Inhibitor and 14, 15-EET in Kawasaki Disease Through PPARgamma\/STAT1 Signaling Pathway - Dai_2020_Front.Pediatr_8_451
Author(s) : Dai N , Yang C , Fan Q , Wang M , Liu X , Zhao H , Zhao C
Ref : Front Pediatr , 8 :451 , 2020
Abstract : Soluble epoxide hydrolase (sEH) is responsible for rapid degradation of 14, 15-EET, which is one of the isomers of EETs and plays an important role in cardiovascular diseases. In this study, we investigated the mechanism by which sEH inhibitor AUDA played an anti-inflammatory effect in HCAECs. Our results indicated that AUDA treatment promoted PPARgamma expression, while knockdown of PPARgamma blocked the cell growth and STAT1 expression inhibition induced by 100 mumol/L AUDA in HCAECs. AUDA also inhibited the overexpression of TNF-alpha, IL-1 beta, and MMP-9 induced by KD sera in HCAECs. Moreover, 30 blood samples from children with Kawasaki disease (KD) were collected with 30 healthy children as the control group. QPCR and ELISA assays were used to detect the level of 14, 15-EET, TNF-alpha, IL-1beta, and MMP-9. We found that the level of 14, 15-EET was higher in peripheral blood of children with KD compared with healthy controls (P < 0.05). In comparison to KD children with non-coronary artery lesion (nCAL), the level of 14, 15-EET was higher in peripheral blood of KD children with coronary artery lesion (CAL) (P < 0.05). Compared with healthy control group, the expression levels of TNF-alpha, IL-1beta, and MMP-9 in patients with KD were significantly up-regulated. Compared with nCAL KD children, the expression levels of TNF-alpha, IL-1beta, and MMP-9 in CAL children were abnormally high (P < 0.05). Our study indicated that AUDA played an anti-inflammatory effect in HCAECs through PPARgamma/STAT1 signaling pathway, and 14, 15-EET is up-regulated in children with KD, suggesting that 14, 15-EET involved in the progression of KD.
ESTHER : Dai_2020_Front.Pediatr_8_451
PubMedSearch : Dai_2020_Front.Pediatr_8_451
PubMedID: 32903307

Title : Effect of Maternal Administration of Edible Bird's Nest on the Learning and Memory Abilities of Suckling Offspring in Mice - Xie_2018_Neural.Plast_2018_7697261
Author(s) : Xie Y , Zeng H , Huang Z , Xu H , Fan Q , Zhang Y , Zheng B
Ref : Neural Plast , 2018 :7697261 , 2018
Abstract : Although human brains continue developing throughout the underage developmental stages, the infancy period is considered the most important one for the whole life. It has been reported that sialic acid from edible bird's nest (EBN) can facilitate the development of brain and intelligence. In this study, by oral administration of EBN to female mice during the pregnancy or lactation period, the effects of EBN on the levels of sialic acid in mouse milk were determined using high-performance liquid chromatography (HPLC). Furthermore, the spatial learning performances of their offspring were assessed using the Morris water maze test. Additionally, cerebral malondialdehyde (MDA), superoxide dismutase (SOD), choline acetyltransferase (ChAT), and acetylcholinesterase (AChE) in cubs nursed by the female mice given the EBN homogenate were examined, while BDNF immunohistochemical staining and neuron count in hippocampi were investigated as well. These results showed that administration with EBN in maternal mice during pregnancy or lactation period can improve the learning and memory functions in their offspring, possibly by increasing the activities of SOD and ChAT and, at the meantime, decreasing the levels of MDA and activities of AChE. Moreover, BDNF levels for CA1, CA2, and CA3 regions in hippocampi and the numbers of dyed neurons in CA1, CA2, CA3, and DG regions among the offspring were significantly enhanced due to the intake of EBN by the maternal mice. We concluded that maternal administration of EBN during the pregnancy and lactation periods can improve the spatial learning performances in the offspring.
ESTHER : Xie_2018_Neural.Plast_2018_7697261
PubMedSearch : Xie_2018_Neural.Plast_2018_7697261
PubMedID: 29765403

Title : Inhibition of soluble epoxide hydrolase in mice promotes reverse cholesterol transport and regression of atherosclerosis - Shen_2015_Atherosclerosis_239_557
Author(s) : Shen L , Peng H , Peng R , Fan Q , Zhao S , Xu D , Morisseau C , Chiamvimonvat N , Hammock BD
Ref : Atherosclerosis , 239 :557 , 2015
Abstract : Adipose tissue is the body largest free cholesterol reservoir and abundantly expresses ATP binding cassette transporter A1 (ABCA1), which maintains plasma high-density lipoprotein (HDL) levels. HDLs have a protective role in atherosclerosis by mediating reverse cholesterol transport (RCT). Soluble epoxide hydrolase (sEH) is a cytosolic enzyme whose inhibition has various beneficial effects on cardiovascular disease. The sEH is highly expressed in adipocytes, and it converts epoxyeicosatrienoic acids (EETs) into less bioactive dihydroxyeicosatrienoic acids. We previously showed that increasing EETs levels with a sEH inhibitor (sEHI) (t-AUCB) resulted in elevated ABCA1 expression and promoted ABCA1-mediated cholesterol efflux from 3T3-L1 adipocytes. The present study investigates the impacts of t-AUCB in mice deficient for the low density lipoprotein (LDL) receptor (Ldlr(-/-) mice) with established atherosclerotic plaques. The sEH inhibitor delivered in vivo for 4 weeks decreased the activity of sEH in adipose tissue, enhanced ABCA1 expression and cholesterol efflux from adipose depots, and consequently increased HDL levels. Furthermore, t-AUCB enhanced RCT to the plasma, liver, bile and feces. It also showed the reduction of plasma LDL-C levels. Consistently, t-AUCB-treated mice showed reductions in the size of atherosclerotic plaques. These studies establish that raising adipose ABCA1 expression, cholesterol efflux, and plasma HDL levels with t-AUCB treatment promotes RCT, decreasing LDL-C and atherosclerosis regression, suggesting that sEH inhibition may be a promising strategy to treat atherosclerotic vascular disease.
ESTHER : Shen_2015_Atherosclerosis_239_557
PubMedSearch : Shen_2015_Atherosclerosis_239_557
PubMedID: 25733327