JOURNAL OF MOLECULAR RECOGNITION
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2024
·Vol. 37
·期 5
·e3100
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IF 2.3
Jiachen Li,Xiaoting Dong,Yeli Zhang
Metallo-β-lactamases (MβLs) hydrolyze and inactivate β-lactam antibiotics, are a pivotal mechanism conferring resistance against bacterial infections. SMB-1, a novel B3 subclass of MβLs from Serratia marcescens could deactivate almost all β-lactam antibiotics including ampicillin (AMP), which has posed a serious threat to public health. To illuminate the mechanism of recognition and interaction between SMB-1 and AMP, various fluorescence spectroscopy techniques and molecular dynamics simulation were employed. The results of quenching spectroscopy unraveled that AMP could make SMB-1 fluorescence quenching that mechanism was the static quenching; the synchronous and three-dimensional fluorescence spectra validated that the microenvironment and conformation of SMB-1 were altered after interaction with AMP. The molecular dynamics results demonstrated that the whole AMP enters the binding pocket of SMB-1, even though with a relatively bulky R1 side chain. Loop1 and loop2 in SMB-1 undergo significant fluctuations, and α2 (71–73) and local α5 (186–188) were turned into random coils, promoting zinc ion exposure consistent with circular dichroism spectroscopy results. The binding between them was driven by a combination of enthalpy and entropy changes, which was dominated by electrostatic force in agreement with the fluorescence observations. The present study brings structural insights and solid foundations for the design of new substrates for β-lactamases and the development of effective antibiotics that are resistant to superbugs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Chunling Nie,Bingqian Liu,Yinfeng Tan,Pengrui Wu,Yefan Niu,Guangsen Fan,Jianguo Wang
In this study, high internal phase Pickering emulsions (HIPPEs) were stabilized by the complexes of peanut protein isolate (PPI) and cellulose nanocrystals (CNCs) for encapsulation β -carotene to retard its degradation during processing and storage. CNCs were prepared by H 2 SO 4 hydrolysis (HCNCs), APS oxidation (ACNCs) and TEMPO oxidation (TCNCs), exhibiting needle-like or rod-like structures with nanoscale size and uniformly distributed around the spherical PPI particle, which enhanced the emulsifying capability of PPI. Results of optical micrographs and droplet size measurement showed that Pickering emulsions stabilized by PPI/ACNCs complexes exhibited the most excellent stability after 30 days of storage, which indicated that ACNCs had the most obvious effect to improve emulsifying capability of PPI. HIPPEs encapsulated β -carotene ( β c-HIPPEs) were stabilized by PPI/ACNCs complexes and showed excellent inverted storage stability. Moreover, β c-HIPPEs exhibited typical shear thinning behavior investigated by rheological properties analysis. During thermal treatment, ultraviolet radiation and oxidation, the retentions of β -carotene encapsulated in HIPPEs were improved significantly. This research holds promise in expanding Pickering emulsions stabilized by proteins-polysaccharide particles to delivery systems for hydrophobic bioactive compounds.
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Journal of the Mechanical Behavior of Biomedical Materials
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2025
·
IF 3.5
Song Fuxiang,Ze Lalai·A Di Li,Wang Zhili,Ling Yunxiao,Zhao Qianjuan,Liu Bin
The repair of critical bone defects resulting from trauma, infection, tumors, and congenital malformations poses significant clinical challenges. The combination of medical-grade polycaprolactone (PCL) and β-tricalcium phosphate (β-TCP) is widely investigated for developing synthetic bone graft substitutes, attracting considerable interest in regenerative medicine. However, the material's inherent lack of osteogenic capacity remains a bottleneck to its widespread clinical application. This study synthesized a strontium oxide (SrO)-functionalized three-dimensional (3D)-printed polycaprolactone (PCL)/β-tricalcium phosphate (β-TCP) composite scaffold. Gradient SrO-doped (0-2.0 wt %) 3D printed scaffolds (3D PTSr) were fabricated by melt blending and direct ink writing (DIW) technology, and their physicochemical and biological properties were systematically characterized. Scanning electron microscopy (SEM) showed that the 3D PTSr scaffold had a precisely regulated macroscopic pore structure (pore size ∼ 1 mm) and uniformly distributed Sr element. When the doping amount of SrO was 1.5 wt %, the scaffold exhibited the best comprehensive performance: the surface contact angle was reduced to 64.78°±0.54°, and the weight loss rate was 42.83±0.02% after 4 weeks of in vitro degradation. At the same time, it showed the sustained release characteristics of Sr 2+ for 56 days (cumulative release of 10.42 ppm). Mechanical tests showed that the compressive strength (5.64 ± 0.04 MPa) and tensile strength (2.75 ± 0.16 MPa) were significantly better than the control group (p < 0.05). In vitro biomimetic mineralization experiments confirmed that SrO functionalization facilitated dense calcium-phosphate composite layer formation. In vitro experiments demonstrated that the 3D PTSr1.5 scaffold significantly promoted the proliferation of MC3T3-E1 cells, and its osteogenic differentiation ability was verified by increasing alkaline phosphatase (ALP) activity and calcium nodule formation. Implantation of 3D PTSr1.5 scaffold into rat cranial defects significantly enhanced bone regeneration at 12 weeks versus controls. Histological analysis confirmed substantial regeneration of mature bone tissue and collagen fibers within the defect area. This study reveals the molecular mechanism of SrO functionalization promoting bone regeneration by regulating the synergistic effect of material degradation-ion release-topology, and provides a theoretical basis and technical reserve for the development of next-generation intelligent bone repair materials.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2025
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IF 2.8
Jing Lin,Dan Li,Peiyuan Luo,Laisheng Li
A bis (3,5-dichlorophenylureido)-β-cyclodextrin stationary phase (CUCDP) was prepared and characterized. It had strong chiral separation abilities for antihistamines ( R s = 1.61–2.58) in isocratic elution, including chlorpheniramine maleate, bromopheniramine maleate, promethazine hydrochloride and trimeprazine tartrate. Based on CUCDP, a new HPLC method for simultaneous separation and determination of the above eight antihistamine enantiomers ( R s = 1.58–1.92) in human plasma by gradient elution was established. The optimized conditions were as follows: a simple sample pretreatment with acetonitrile (ACN) to precipitate protein, a gradient elution of 0.5 % triethylammonium acetate (TEAA, pH = 4.0)-ACN as the mobile phase at a flow rate of 0.5 mL/min, column temperature at 20 °C, a photo-diode array detector (PDA) at 260 nm, and the sampling volume of 10 μL. The good linear relationships for all enantiomers were observed in the concetration range of 0.25–10.0 μg/mL ( R 2 = 0.9986–0.9993). The average recoveries were 84.80 %–103.30 % with the RSDs of 1.24 %–2.26 % ( n = 5). The limits of detection (LODs) and limits of quantification (LOQs) were 0.015–0.05 μg/mL and 0.05–0.15 μg/mL, respectively. At present, the reported cyclodextrin-based CSPs had not such separation ability for antihistamines by HPLC. However, the new CUCDP exhibited high chiral selectivity for antihistamines, which was mainly related to the introduction of bis phenylureido group into the rim of cyclodextrin, and the strengthening of hydrogen bonding, π–π stacking and inclusion between CUCDP and analytes. This method could save analysis time, reduce solvent consumption, and improve efficiency at low cost.
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Drug Delivery and Translational Research
·
2025
·
IF 5.5
Liu Xiaoli,Li Xiaojuan,He Weijun,Han Xiaoyu,Xiao Ting,Guo Shiqi,Jia Yujie,Lin Liqun,Yang Ming,Wang Li,Xu Yuehong
Acne is a multifactorial dermatological condition driven by Propionibacterium acnes ( P. acnes ) infection, inflammation, and sebum dysregulation. While essential oils, such as Angelica sinensis (Danggui) essential oil (AEO), exhibit antimicrobial and anti-inflammatory properties, their clinical application is hindered by poor solubility, stability, and skin penetration. To address these limitations, we developed hydroxypropyl- β -cyclodextrin (HPCD)-complexed AEO-loaded microneedles (AEO@HPCD MNs) using hyaluronic acid for enhanced transdermal delivery. The optimized AEO@HPCD MNs demonstrated superior mechanical strength, rapid dissolution, and efficient cargo release. In vitro studies confirmed potent antibacterial activity against P. acnes , while in vivo experiments revealed significant reductions in acne lesion size and IL-1 β levels. RNA sequencing of treated acne lesions identified key downregulated genes ( Fpr1 , Rarres2 , Cxcl5 , Gbp3 , Hck , Gbp7 , Librb4a , Psmb8 ) and enriched pathways, including innate immunity and inflammatory responses. Notably, AEO@HPCD MNs suppressed 5 α -reductase and fatty acid synthase (FAS) expression, demonstrating—for the first time—AEO’s ability to normalize sebum production. Mechanistically, AEO@HPCD MNs exert multifaceted therapeutic effects: (1) direct antibacterial activity against P. acnes , (2) suppression of inflammatory and immune-related pathways through modulation of Toll-like receptor, NOD-like receptor, and cytokine-cytokine receptor signaling pathways, (3) regulation of sebum production via lipid-metabolic gene expression modulation, and (4) enhanced delivery efficiency and microenvironment modification through the physical action of microneedles, collectively contributing to synergistic acne therapy. This study develops a microneedle delivery platform that addresses both essential oil instability and inclusion complex delivery challenges while targeting multiple acne pathogenic factors. The AEO@HPCD MNs provide a safe, minimally invasive, multifunctional therapeutic strategy for acne treatment.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tingting Bai,Yanjia Liu,Ling Jian,Zhien Liu,Longxin Xu,Zhongwen Liu,Daohong Wu
β-lactoglobulin (β-Lg) is the most allergenic allergen in milk and can affect the health of infants and young children seriously. Detecting β-Lg in food products is an urgent requirement. The coordination of Cu(II) with single-strand DNA as metalloenzyme was used to catalyze TMB (3, 3′, 5, 5′-tetramethylbenzidine)-H 2 O 2 reaction to generate electrochemistry signal. Firstly, DNA 1 self-assembly on the electrode and hybridized with DNA 2 to form DNA 1 /DNA 2 double-stranded complex. Secondly, β-Lg combined with DNA 2 (aptamer) which partially complementary with DNA 1 via target-ligand interaction, β-Lg/DNA 2 complex formed and released, DNA-Cu(II)-AuNPs nanocomposites as catalysis for TMB-H 2 O 2 reaction was introduced subsequently. Thus, AuNPs coated with DNA-metalloenzyme as target-responsive and signal-amplification material for β-Lg detection was obtained. The detection limit of 1.69 pg/mL and linear range of 0.01—100 ng/mL was obtained. This aptasensor exhibits excellent selectivity for interfering ingredients, even if their concentration is 1000 times that of β-Lg. The recovery of standard addition experiment at three levels for four kinds of foods is in the range of 84.50–93.70 %, and RSD of 4.23–11.58 % was obtained. More importantly, β-Lg content detected in another six kinds of food products is consistent with β-Lg content reported which indicated good accuracy was obtained. In a word, this aptasensor exhibits prominent sensitivity, selectivity, accuracy, stability and repeatability which should be provided a universal substitution combination strategy for food allergens detection in future.
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Innovative Food Science & Emerging Technologies
·
2025
·
IF 6.8
Bin Niu,Jiao Fang,Yizhe Yan
The effect of plasma-activated water (PAW) on the formation of the wheat starch (WS)-lauric acid-β-lactoglobulin ternary complexes by extrusion was investigated. PAW improved the amylose content of extruded WS from 23.31 % to 27.62 %. PAW60 (plasma treatment of water for 60 s) was most effective in promoting the formation of ternary complexes, which exhibited the highest complexing index (50.88 %), and the best crystalline and short-range ordered structure. Additionally, they also showed the highest enthalpy (3.46 J/g), viscosity, and resistant starch content (18.59 %), and the worst swelling power (5.27 g/g), solubility (2.98 %), and gel structure (lowest tan δ). The promotion effect of PAW120 and PAW180 (plasma treatment of water for 120 and 180 s) was not as effective as PAW60, due to the production of shorter amylose chains induced by PAW generated from excessive plasma treatment. Notably, PAW60, PAW120, and PAW180 were better than PAW0 in facilitating the fabrication of ternary complexes, and principal component analysis also verified that PAW could significantly affect the generation and features of these complexes during extrusion. This study provides an emerging technique to regulate the generation and features of starch-lipid-protein complexes.
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Yuanjian Liu,Yan Qi,Panpan Liu,Yusong Wan,Fengyang Wang,Yunlong Liu,Xiaohui Xiong
Herein, a novel bipolar electrode-electrochemiluminescence (BPE-ECL) biosensing strategy was developed, engineered to achieve highly and pathogen-specific detection of Escherichia coli O157:H7 ( E. coli O157:H7) through enzymatic cascade signal transduction. Crucially, this strategy employs β-galactosidase (β-gal) activity as a biomarker signature, wherein the enzymatic hydrolysis of p -nitrophenyl-β-D-galactopyranoside (PNPG) generates electroactive intermediates, p-nitrophenol (pNP). The pNP undergoes a six-electron reduction reaction at the closed BPE cathode electrode and simultaneously oxidizes phosphorus Ru(bpy) 3 2+ at the anode electrode to trigger obvious ECL signal. The ECL signal amplification of enzymatic substrates with mono-, bi-, and tetra-electronic systems is inherently constrained by inefficient electron transfer, resulting in suboptimal sensing performance. In contrast, the PNPG/pNP-based detection platform demonstrates superior sensing capabilities. For indirect quantification of E. coli O157:H7, the ECL intensity was linearly correlated with bacterial concentration. The optimized biosensor, through rigorous tuning of enzymatic catalysis and ECL signal amplification strategies, delivers a wide dynamic range (10(Zhang et al., 2023a 1) –10 6 CFU) and a low detection limit (LOD = 2 CFU) in 200 μL of bacterial samples. The real sample effect was evaluated, and the assay successfully detected E. coli O157:H7 in water, juice, and pure milk. This label-free platform integrates operational simplicity and high specificity, offering a promising solution for on-site monitoring of foodborne pathogens and clinical diagnostics.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jie Song,Yingnan Zhou,Lijun Chen,Zhiwen Yuan,Yuhua Niu,Xi Li,Liangxian Huang
This study employed β-cyclodextrin (β-CD) for the hydrophilic modification of iron tetraoxide (Fe3O4) magnetic materials. Subsequently, potassium humate (KHA) and carboxymethyl cellulose (CMC) were used as raw materials. A β-CD@Fe3O4/KHA/CMC/AM/MAH hydrogel with magnetic properties which can be easily recycled was synthesized for the slow release of glyphosate (GLY). FTIR, XRD, TG and VSM analyses demonstrated that the hydrogel possesses good thermal stability and magnetic properties with a saturation magnetization strength of 29.77 emu g−1. The equilibrium solubility of the hydrogel in pH = 7.4 and pH = 8.5 buffer was 24.58 g g−1 and 25.83 g g−1, respectively. The maximum release of GLY was recorded at 63.31% and 67.78%, with the drug release behavior under different loading gels following the Fickian diffusion mechanism. A pot planting experiment indicated that the water content of plants treated with the β-CD@Fe3O4/KHA/CMC/AM/MAH drug-loaded gel decreased by 51.69%. Additionally, soluble protein levels decreased to 2.69 mg g−1, chlorophyll content decreased to 0.486 mg g−1, SOD levels decreased to 43.81 U g−1, and MDA increased to 4.02 μmol g−1, effectively inhibiting the growth of grass and providing a theoretical basis for achieving slow drug release.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2025
·
IF 4.7
Lulu Peng,Zhengwei Zou,Lin Zhou,Lincai Li,Wenming Lu,Cixiang Chen,Yan Xu,Yuyue Liu,Jing Lin,Junsong Ye
Hepatic fibrosis (HF) is a leading cause of death worldwide, yet there is currently no safe and effective treatment available. Canagliflozin, a novel glucose-lowering drug, has been shown to improve non-alcoholic steatohepatitis (NASH). However, its therapeutic effects on HF and the underlying molecular mechanisms remain unclear. In this study, HF was induced in mice via intraperitoneal injections of CCl 4 . Additionally, immortalized hepatic stellate cells (HSCs), including HSC-T6 and LX-2 cells, were used for in vitro experiments. Our findings revealed that Canagliflozin inhibited the activation and proliferation of HSCs, thereby downregulated the expression levels of fibrotic markers (α-SMA and Collagen I), ultimately alleviating HF. Further investigations demonstrated that Canagliflozin inhibits protein phosphatase 2 A (PP2A) activity in HSCs, which in turn prevents PP2A-mediated dephosphorylation of β-catenin and attenuates Wnt/β-catenin signaling. While the Wnt/β-catenin signaling is considered a key mechanism that promote the activation and proliferation of HSCs, it is also a crucial pathway in the development of HF. Moreover, increased activity of PP2A was found to promote the expression of fibrotic markers (α-SMA and Collagen I) in HSCs. In conclusion, our study indicates that Canagliflozin ameliorate HF via inhibiting PP2A-mediated dephosphorylation of β-catenin in HSCs. The inhibition of PP2A in HSCs may represent a potential therapeutic target not only for cancer treatment but also for the management of HF.
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GREEN CHEMISTRY
·
2025
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IF 9.2
Renlong Min,Chenyu Zhang,Haijuan Kong,Shuo Liu,Ziyao Peng
Carbon fiber-reinforced polymers (CFRPs) are widely applied due to their outstanding mechanical properties. However, the intrinsic difficulty in recycling their thermoset resin matrix has led to serious environmental pollution and resource waste, becoming a major bottleneck hindering the sustainable development of CFRPs. In this study, a green and efficient chemical recycling strategy was developed by constructing a synergistic catalytic system composed of β-phenylethanol and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), enabling the rapid degradation of anhydride-cured epoxy-based CFRPs under mild conditions (190 °C, atmospheric pressure). By optimizing the mass ratio of the catalyst to the composite material [TBD : CFRP (wt : wt) = 1 : 3.27], nearly complete resin degradation (>99%) was achieved within 2 hours. The reclaimed carbon fibers retained up to 93.2% of their original single-fiber tensile strength. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses confirmed that no significant deterioration occurred in the surface chemical functionalities or the degree of graphitization of the reclaimed fibers compared to the pristine ones. This work offers a simple, efficient, and environmentally friendly solution for the closed-loop recycling of thermoset-based CFRPs.
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PHYTOMEDICINE
·
2025
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IF 8.3
Nan Wu,Wenjing Zhang,Sunyue He,Lusi Lu,Yiming Liu,Shuainan Liu,Lei Lei,Shuiya Sun,Yuchen Zhao,Chunyi Xu,Xihua Lin,Jiaqiang Zhou
Background β-cell dedifferentiation and impaired maturation are crucial contributors to β-cell dysfunction in type 2 diabetes mellitus (T2DM), yet targeted therapies remain limited. Objective To investigate the protective effects of Ramulus Mori (Sangzhi) Alkaloids (SZ-A) on β-cell function and maturation in T2DM. Methods A T2DM mouse model was induced by high-fat diet and streptozotocin, followed by SZ-A treatment. Single-cell RNA sequencing (scRNA-seq) was used to profile β-cell subpopulations, identifying Cd81 as a marker of β-cell immaturity. Cd81 -overexpressing diabetic mice, as well as β-TC-6 cells with either Cd81 overexpression or knockdown, were employed to explore the role of CD81 in SZ-A-mediated β-cell maturation. Western blotting was performed to evaluate the effects of SZ-A on endoplasmic reticulum (ER) stress. The potential interactions between SZ-A components—1-deoxynojirimycin (DNJ), fagomine (FAG), and 1,4-dideoxy-1,4-imino-D-arabinitol (DAB)—and CD81 were investigated using molecular docking. Results SZ-A treatment improved glucose metabolism in T2DM mice in a dose-dependent manner. ScRNA-seq revealed an increased proportion of Cd81 high β-cells with reduced expression of mature β-cell markers in diabetic islets, which was reversed by SZ-A. CD81 overexpression attenuated the metabolic benefits of SZ-A both in vivo and in vitro. Mechanistically, SZ-A alleviates CD81-mediated ER stress, at least in part via its active components DNJ and FAG, which may bind to CD81, suppress its expression, and thereby promote insulin secretion. Conclusion SZ-A promotes β-cell maturation and function by suppressing CD81-mediated ER stress. These findings reveal a novel therapeutic mechanism of SZ-A and identify CD81 as a potential target for T2DM intervention.
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