Frontiers in Microbiology
·
2016
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IF 4.165
Gu Haiping,Lou Jun,Wang Haizhen,Yang Yu,Wu Laosheng,Wu Jianjun,Xu Jianming
Reducing phenanthrene (PHE) in the environment is critical to ecosystem and human health. Biodegradation, biosorption, and the trans-membrane transport mechanism of PHE by a novel strain, Massilia sp. WF1, and an extensively researched model fungus, Phanerochaete chrysosporium were investigated in aqueous solutions. Results showed that the PHE residual concentration decreased with incubation time and the data fitted well to a first-order kinetic equation, and the t1/2 of PHE degradation by WF1, spores, and mycelial pellets of P. chrysosporium were about 2 h, 87 days, and 87 days, respectively. The biosorbed PHE was higher in P. Chrysosporium than that in WF1, and it increased after microorganisms were inactivated and inhibited, especially in mycelial pellets. The detected intracellular auto-fluorescence of PHE by two-photon excitation microscopy also proved that PHE indeed entered into the cells. Based on regression, the intracellular (Kdin) and extracellular (Kdout) dissipation rate constants of PHE by WF1 were higher than those by spores and mycelial pellets. In addition, the transport rate constant of PHE from outside solution into cells (KinS/Vout) for WF1 were higher than the efflux rate constant of PHE from cells to outside solution (KoutS/Vin), while the opposite phenomena were observed for spores and mycelial pellets. The amount of PHE that transported from outside solution into cells was attributed to the rapid degradation and active PHE efflux in the cells of WF1 and P. Chrysosporium, respectively. Besides, the results under the inhibition treatments of 4°C, and the presence of sodium azide, colchicine, and cytochalasin B demonstrated that a passive trans-membrane transport mechanism was involved in PHE entering into the cells of WF1 and P. Chrysosporium.
研究领域:
环境生物学
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微生物学
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DOI
PubMed
高影响因子
Nature Communications
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2020
·Vol. 11
·期 1
·1-10
·
IF 12.121
Wu Feng,Pang Yan,Liu Jinyao
Biological tissues, such as muscle, can increase their mechanical strength after swelling due to the existence of many biological membrane barriers that can regulate the transmembrane transport of water molecules and ions. Oppositely, typical synthetic materials show a swelling-weakening behavior, which always suffers from a sharp decline in mechanical strength after swelling, because of the dilution of the network. Here, we describe a swelling-strengthening phenomenon of polymer materials achieved by a bioinspired strategy. Liposomal membrane nanobarriers are covalently embedded in a crosslinked network to regulate transmembrane transport. After swelling, the stretched network deforms the liposomes and subsequently initiates the transmembrane diffusion of the encapsulated molecules that can trigger the formation of a new network from the preloaded precursor. Thanks to the tough nature of the double-network structure, the swelling-strengthening phenomenon is achieved to polymer hydrogels successfully. Swelling-triggered self-strengthening enables the development of various dynamic materials.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2014
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IF 3.499
Feng Li,Lizhong Zhu
The effects of the surfactants, Tween 80 and sodium dodecyl benzene sulfonate (SDBS) on a membrane’s fatty acid composition and the transmembrane transport of phenanthrene were investigated. The results indicated that both surfactants could modify the composition of fatty acids of Citrobacter sp. Strain SA01 cells, 50 mg L −1 of both surfactants changed the composition of the fatty acids the most, increasing the amount of unsaturated fatty acids. The comparison of fatty acid profiles with diphenylhexatriene fluorescence anisotropy, a probe for plasma membrane fluidity, suggested that an increased amount of unsaturated fatty acids corresponded to greater membrane fluidity. In addition, increased unsaturated fatty acids promoted phenanthrene to partition from the extracellular matrix to cell debris, which increased reverse partitioning from the cell debris to the cytochylema. The results of this study were expected in that the addition of a surfactant is a simple and effective method for accelerating the rate-limiting step of transmembrane transport of hydrophobic organic compounds (HOCs) in bioremediation.
研究领域:
环境微生物学
·
污染修复
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Wen-Jian Zhang,Chun-Yan Hong,Cai-Yuan Pan
Intelligent vesicles are fabricated at up to 30% solid content via an approach of polymerization-induced self-assembly and reorganization (PISR). Upon irradiation with UV light (365 nm), light-triggered dimerization of the coumarin moieties anchored in the membrane leads to the membrane cross-linking of the vesicles, which endows the vesicles with superior structural stability. Due to the tertiary amine groups in the membrane, the vesicles go through a swelling/deswelling change upon switching the pH values. In acidic aqueous solution, the pores in the membrane of vesicles are opened, which is beneficial for transmembrane traffic. The pore size in the membrane of vesicles is in accordance with the extent of membrane cross-linking, which can be conveniently regulated by the irradiation time of UV light (365 nm). The size range of the substance for transmembrane traffic is effectively enlarged; even 15 nm gold nanoparticles can be postloaded into the vesicles with lower extents of the membrane cross-linking through the diffusion method. Although the pores in the vesicle membrane are opened in acidic aqueous solution, transmembrane traffic is inhibited for the electropositive substance because of electrostatic repulsion but is allowed for the electronegative substance. These reported vesicles herein may be the smartest artificial vesicles to date due to their multiple selective permeability.
研究领域:
生物材料学
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化学合成
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纳米医学
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产品关联
DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2020
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IF 5.88
Qiankun Jiang,Lingqiong Wu,Yue Zheng,Xiaojie Xia,Ping Zhang,Tong Lu,Jing Li
To combine the advantages of micelles and biomimetic silica materials, biomimetic micellar mesoporous silica xerogel (BM-SX) was initially established, biomimetic silica xerogel (B-SX) was also studied as control and nitrendipine (NDP) was taken as model drug. The content mainly focused on drug dissolution, systemic stability and cellular transmembrane transport of NDP loaded B-SX and NDP loaded BM-SX. With extra mesopores formed due to HPMC E50 micelles, the mean pore diameter, surface area and pore volume of BM-SX were all larger than B-SX. After loading NDP into the two carriers, crystal NDP changed to amorphous phase, leading to enhanced NDP dissolution. BM-SX presented superior abilities not only for its higher drug dissolution compared to B-SX but also for its capacity in remaining high amorphous drug phase and therefore no drug dissolution reduction can be observed. The dynamic contact angle result confirmed the strong power of HPMC E50 micelles in maintaining amorphous NDP in the carrier to improve high systemic stability. Both B-SX and BM-SX could increase drug absorption permeability and exert function as drug efflux inhibitor to inhibit the efflux effect of p-gp drug pump and promote NDP absorption and transport, and BM-SX was superior owing to micelles in the system.
研究领域:
药剂学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
MEASUREMENT
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2024
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IF 5.2
Ya’nan Wang,Bangkun Yue,Xiaofang Li,Fei Wang,Weijun Huang,Yongchang Zhang,Xinxin Jin,Feng Liu,Yanmin Duan,Haiyong Zhu,Zhihong Li
Potassium ions ( K + ) transmembrane transport is essential for regulating various physiological processes . Herein, a label-free tilted fiber Bragg grating (TFBG)-assisted plasmonic sensor was proposed and experimentally demonstrated for measuring K + transmembrane movement in situ and continuously. The sensor was coated with valinomycin-modified vesicular liposome , providing an exceptional capability for selectively capturing and transporting K + through the liposome’s bilayer membrane . A differential demodulation method was proposed, by which great advancements were achieved in unveiling K + transmembrane process showing three stages in real time. In particular, not only does the sensor sensitively detect low K + level (detection limit down to 8.5 pM) but also successively decouple bulk and surface effects involved in transmembrane dynamics, along with additional advantage of resistance to temperature and light power fluctuations. These advancements represent great progress in revealing K + transmembrane movement and highlight the potential for monitoring transmembrane-related cellular signaling pathways like cell proliferation and apoptosis.
研究领域:
生物物理学
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分析化学
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医学工程
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DOI
高影响因子
Materials
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2024
·Vol. 17
·期 11
·2570
·
IF 3.1
Yu Kong,Rong Zhang,Boyang Li,Wei Zhao,Ji Wang,Xiao-Wen Sun,Huihui Lv,Rui Liu,Juan Tang,Biao Wu
Phosphates play a crucial role in drug design, but their negative charge and high polarity make the transmembrane transport of phosphate species challenging. This leads to poor bioavailability of phosphate drugs. Combretastatin-A4 phosphate (CA4P) is such an anticancer monoester phosphate compound, but its absorption and clinical applicability are greatly limited. Therefore, developing carrier systems to effectively deliver phosphate drugs like CA4P is essential. Anion receptors have been found to facilitate the transmembrane transport of anions through hydrogen bonding. In this study, we developed a tripodal hexaurea anion receptor (L1) capable of binding anionic CA4P through hydrogen bonding, with a binding constant larger than 104M−1in a DMSO/water mixed solvent.L1demonstrated superior binding ability compared to other common anions, and exhibited negligible cell cytotoxicity, making it a promising candidate for future use as a carrier for drug delivery.
研究领域:
药学
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药物递送系统
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药物化学
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癌症研究
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DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
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2024
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IF 7
Yu Xiao,Zeyun Zhao,Tao Zhang,Xiaoqi Xu,Anik Khan,Yibin Qiu,Zheng Xu,Sha Li,Hong Xu
Pigeon egg white (PEW) is widely recognized as a promising source of bioactive proteins, with a high degree of glycosylation. This study focused on the characterization of a novel glycoprotein extracted from PEW, known as ovalbumin-related protein Y (OVAY). Our investigation included an analysis of the N-glycan and protein structures of OVAY, as well as an examination of simulated gastrointestinal digestive products and the transmembrane transport mechanism of OVAY-digested peptides. The results revealed that OVAY contains two glycosylation sites (Asn 62, 215) and consists of 30 N-linked glycoforms, with the top three glycans being N6H3, N6H7S1, and N6H5. Additionally, OVAY is rich in Gal and sialic acid and exhibits a rod-like molecular structure. Furthermore, it was found that OVAY demonstrates resistance to gastric digestion, with its digested peptides primarily transported via PepT1 and endocytosis. This study provides insight into the glycoprotein structure of OVAY and elucidates its physiological activity, providing a theoretical reference for the development of a novel sialate-rich protein.
研究领域:
生物化学
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蛋白质科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2020
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IF 7.539
Honghong Guo,Jie Gu,Xiaojuan Wang,Mubasher Nasir,Jing Yu,Liusheng Lei,Qianzhi Wang
This experiment investigated the effect of adding a microbial inoculum (M) and ferric chloride (F) on the fate of antibiotic resistance genes (ARGs) during chicken manure composting. Adding M and F improved the microbial activity in the compost and facilitated the removal of ARGs, whereas the combined treatment achieved the best results, especially in reducing the enrichment of sul resistance genes. Tn916/1545 and intI1 were important genetic elements that affected the transfer of ARGs, and Tn916/1545 was closely related to the transfer of tetM , tetW , and ermQ in Firmicutes. Kyoto Encyclopedia of Genes and Genomes functional predictions indicated that M and F could reduce the abundance of membrane transport and signal transduction molecules in the compost products. Thus, these findings suggest that the combined application of M and F is a promising strategy that could potentially inhibit the transfer of ARGs during composting.
研究领域:
环境科学
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微生物学
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生物技术
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2022
·
IF 9.231
Yi Wu,Minhua Zong,Zhenhui Zhang,Yongtai Wu,Lin Li,Xia Zhang,Hong Wu,Bing Li
Advanced glycation end-products (AGEs) are a chemically heterogeneous set of modifications widely found in processed foods. Due to uncertain bioavailability, dietary AGEs regulate energy homeostasis through mechanisms that largely remain unclear. In this study, selective transmembrane transport of AGEs with different modification types from glycated β-casein digest were identified and compared. The results showed that only a few types of free and peptide-bound AGEs can easily cross the Caco-2 monolayers and thus exert their effects. A combination of biochemical assays, mitochondrial analyses, and comparative experiments identified that the effect of AGEs on cellular energy homeostasis comes mainly from their free fractions. Mechanistically, free AGEs arrest the mitochondrial differentiation and mtDNA repair by intervening in the function of thymidine phosphorylase, and interfering with mitochondrial energy production by inhibiting the activation of AMPK-SIRT6 signaling pathway. These results demonstrate mechanisms by which processed foods cause mitochondrial dysfunction and lead to dysfunctional energy homeostasis.
研究领域:
营养学
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细胞生物学
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代谢学
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食品科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Li Li,Mingjie Xia,Lina Yang,Yutang He,He Liu,Mengxi Xie,Miao Yu
Polysaccharides impact intestinal fermentation and regulate interfacial properties which affect absorption and transportation. Short-chain fatty acids (SCFAs), the main metabolites of soy hull polysaccharide lysate, are readily absorbed by the body and perform various physiological functions. We analysed the interfacial properties and transport of soy hull polysaccharide-derived SCFAs in the Caco-2 cell model to clarify the transmembrane transport mechanism. The results showed that the interfacial properties of the co-culture system were influenced by both transit time and concentration of SCFAs, the uptake and transit rates of SCFAs at 1–3 h increased significantly with time ( P < 0.05). With increasing transit time and concentration, the transit rates of SCFAs on the apical side (AP) → basolateral side (BL) and BL → AP sides increased and then stabilised, the transit rate of the AP → BL side was higher than that of the BL → AP side. Proteomic analysis showed that soy hull polysaccharide-derived SCFAs resulted in the differential expression of 285 upregulated and 501 downregulated after translocation across Caco-2 cells. The differentially expressed proteins were mainly enriched in ribosomes, oxidative phosphorylation, nuclear transport, and SNARE vesicular transport. This study lays the theoretical foundation for understanding the structure-activity relationship of soy hull polysaccharides in the intestine.
研究领域:
营养学
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胃肠病学
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分子生物学
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细胞生物学
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蛋白质组学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 7
·3307-3319
·
IF 7.233
Zhiyu He,Zhijia Liu,Houkuan Tian,Yizong Hu,Lixin Liu,Kam W. Leong,Hai-Quan Mao,Yongming Chen
Scalable manufacturing continues to present a major barrier for clinical translation of nanotherapeutics. Methods available for fabricating protein-encapsulating nanoparticles in a scalable fashion are scarce. Protein delivery often requires multiple functionalities to be incorporated into the same vehicle. Specifically for nanoparticle-mediated oral delivery of protein therapeutics, protection in GI tract, site-specific release, facilitating transmucosal permeation, and enhancing epithelial transport are a few desirable features to be engineered into a nanoparticle system. Here we devised a sequential flash nanocomplexation (FNC) technique for the scalable production of a core–shell structured nanoparticle system by combining materials choice and particle size and structure to fulfill these functions, therefore enhancing the delivery efficiency of insulin. This method is highly effective in controlling the size, generating core–shell structure with high encapsulation efficiency (97%) and payload capacity (67%) using insulin/L-penetratin complex nanoparticles as a core coated with hyaluronic acid (HA). Both the in vitro and in vivo models confirmed that the HA coating on these core–shell nanoparticles enhanced the permeation of nanoparticles through the intestinal mucus layer and improved trans-epithelial absorption of insulin nanoparticles; and the enhancement effect was most prominent using HA with the highest average molecular weight. The insulin-loaded nanoparticles were then encapsulated into enteric microcapsules (MCs) in an FNC process to provide additional protection against the acidic environment in the stomach while allowing rapid release of insulin nanoparticles when they reach small intestine. The optimized multifunctional MCs delivered an effective glucose reduction in a Type I diabetes rat model following a single oral administration, yielding a relative bioavailability of 11% in comparison with subcutaneous injection of free-form insulin. This FNC technique is highly effective in controlling particle size and structure to improve delivery properties and function. It can be easily extended to oral delivery for other protein therapeutics.
研究领域:
纳米技术
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药学
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生物医学工程
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药物递送系统
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）