Journal of Materials Chemistry B
·
2024
·
IF 6.1
Fengyuan Liu,Jiashan Xia,Chun Tao,Changmei Chen,Xiangshu Cheng,Rongchun Yi,Lulu Wang,Yue Wang,Tao Deng
Chirality is a ubiquitous phenomenon in nature. The advent of nanomaterials has led to a gradual evolution of chiral studies from the molecular scale to the nanoscale. The emergence of carbon dots (CDs) has inaugurated a novel domain in the scientific and technological realms of carbon nanomaterials. In recent years, CDs have attracted increasing attention due to their luminescent properties, excellent biocompatibility and remarkable bioactivity. However, little attention has been paid to the chirality of the CDs and, in particular, the differences between CDs synthesized from racemic compounds and other chiral CDs, as well as the differences in the biological effects of chiral CDs, remain to be explored. Here, chiral CDs were synthesized from L-/D-/DL-arginine, and the differences in various aspects of chiral CDs were evaluated. We found that L-CDs without extreme differences in structure had brighter fluorescence and a more significant ability of NO generation and lipid droplet inhibition than the other two chiral CDs. Combined with its better drug loading and release ability, we validated its superior efficacy in tumor treatment. Therefore, this study provides a basis for further research on chiral carbon dots and their differences.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Yanan Gao,Liwei Dou,Hong Gao,Jie Song,Shibin Shang,Zhanqian Song
D-π-D hole-transporting materials have the potential to be excellent dopant-free hole-transporting materials (HTMs) for perovskite solar cells (PSCs) because of their tunable energy levels, high charge mobility, good solubility, and excellent film-forming properties. In this paper, two series of D-π-D type compounds, Series 1 (2TPA-CZ1~2TPA-CZ3) and Series 2 (2DTPA-CZ1~2DTPA-CZ3), were synthesized by linking a carbazole derivative (as a π-bridge) to triaryamine or dehydroabietic acid triarylamine groups (the donor groups) via C–C coupling reactions. The optical, electrochemical, thermal, and photovoltaic properties in PSCs of these compounds were fully investigated. The two series of compounds exhibit good ultraviolet absorption, fluorescence emission , and electrochemical and thermal properties. In addition, their highest occupied molecular orbital levels and energy gaps make them suitable for use as hole-transporting materials in PSCs. Among the PSCs developed, Device 1, based on 2TPA-CZ1, showed the best performance, with a power conversion efficiency (PCE) of 12.27%, a open circuit voltage (V OC ) of 1.13 V, a short-circuit photocurrent density (J SC ) of 15.10 mA cm −2 , and a fill factor (FF) of 71.61%, which is comparable to that of a device based on the conventional hole-transporting material Spiro-OMeTAD. While the PCE of Devices 4–6 was lower than the PCE of Devices 1–3, Devices 4–6 exhibit better stability. This may be due to the higher T g and better film-forming properties of compounds formed using the dehydroabietic acid skeleton. In additional, the introduction of alkyl groups on the carbazole moiety decreased the efficiency of the PSC devices. These results demonstrate that the 2TPA-CZ1 compounds are promising HTMs for PSC applications.
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Molecular Catalysis
·
2024
·
IF 3.9
Wenhao Xia,Shimeng Liu,Lihui Huang,Hao Wu,Tao Bai,Shanshan Wang,Fei Hao,Xiao Wang,Wen Wang
d -tagatose, a rare sugar with broad applications in the food and pharmaceutical industries, can be synthesized from d -fructose by epimerases, an approach with significant biosynthesis potential. However, so far there has been only one attempt to engineer tagatose 4‑epimerase through random mutagenesis. The lack of exploration has severely restricted the application of epimerases in the industrial production of d -tagatose. The previous research primarily focused on enhancing the catalytic activity of epimerases through random mutagenesis, with limited understanding of how substrate-adjacent residues affect enzyme efficiency, which was hence the subject of this study. First, using a semi-rational design approach, after three rounds of mutagenesis and screening, the mutant (S125D/S268A/Q124E) of D-tagaturonate epimerase (UxaE) from Thermotoga neapolitana was obtained, which increased d -tagatose production efficiency by 10.8-fold compared to the wild type, with a specific activity of 1505.6 U/g, representing the highest specific activity reported for a UxaE mutant to date. Molecular dynamics simulations showed that the substitution of Ser to Asp-125 enhanced substrate-enzyme interactions, while the substitution of Glu to Gln-124 reinforced the hydrogen bond network around the catalytic residue Glu-128, further reshaping the substrate-binding pocket and enhancing catalytic activity. This study for the first time explored the enhancement of the C4 epimerization function of epimerases by reshaping their substrate-binding pockets, thereby providing a feasible route for the industrial biosynthesis of d -tagatose.
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Neural Regeneration Research
·
2025
·Vol. 21
·期 7
·3122
·
IF 6.7
Liang Yu,Xi Deshuang,Teng Yilin,Liu Pan,Feng Yanbing,Huang Qiumei,Gao Ming,Zong Shaohui
Export Rat nerve growth factor and total flavonoids from hawthorn leaf contribute to the recovery of neurological function after spinal cord injury, including traumatic, non-traumatic spinal cord injuries. However, it remains challenging to efficiently deliver nerve growth factor and total flavonoids from hawthorn leaf to spinal cord injury sites, ensure their sustained release, and minimize further damage. In the present study, we chose a biocompatible and biodegradable gelatin as the substrate, which was crosslinked with the natural biological crosslinker genipin to form a gelatin–genipin hydrogel carrier for the slow release of nerve growth factor and total flavonoids from hawthorn leaf in spinal cord injury sites. The prepared gelatin–genipin hydrogel had good injectable properties and photothermal effects. Furthermore, when the hydrogel with 2% genipin, 200 ng/mL nerve growth factor, and 320 μg/mL total flavonoids from hawthorn leaf was combined with near infrared irradiation, there was a slow release of total flavonoids from hawthorn leaf and nerve growth factor, reduced oxidative stress, an improved inflammatory microenvironment, and accelerated angiogenesis and axonal regeneration via inhibition of the nuclear factor kappa-B signaling pathway, thereby promoting recovery from spinal cord injury. Collectively, our results indicate that this new hydrogel may improve the prognosis of spinal cord injury, and may represent a new strategy for treating spinal cord injury.
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Neural Regeneration Research
·
2025
·
IF 6.7
Ma Yangguang,Liu Yi,Pan Dongsheng,Zhang Jiawei,Liang Zhuowen,Wang Yi,Hu Xueyu,Wang Zhe,Ding Tan
The blood–spinal cord barrier is crucial for preserving homeostasis of the central nervous system. After spinal cord injury, autophagic flux within endothelial cells is disrupted, compromising the integrity of the blood–spinal cord barrier. This disruption facilitates extensive infiltration of inflammatory cells, resulting in exacerbated neuroinflammatory responses, neuronal death, and impaired neuronal regeneration. Previous research has demonstrated that photobiomodulation promotes the regeneration of damaged nerves following spinal cord injury by inhibiting the recruitment of inflammatory cells to the injured site and restoring neuronal mitochondrial function. However, the precise mechanisms by which photobiomodulation regulates neuroinflammation remain incompletely elucidated. In this study, we established a mouse model of spinal cord injury and assessed the effects of photobiomodulation treatment. Photobiomodulation effectively cleared damaged mitochondria from endothelial cells in mice, promoting recovery of hindlimb motor function. Using microvascular endothelial bEnd.3 cells subjected to oxygen–glucose deprivation, we found that the effects of photobiomodulation were mediated through activation of the PINK1/Parkin pathway. Additionally, photobiomodulation reduced mitochondrial oxidative stress levels and increased the expression of tight junction proteins within the blood–spinal cord barrier. Our findings suggest that photobiomodulation activates mitochondrial autophagy in endothelial cells through the PINK1/Parkin pathway, thereby promoting repair of the blood–spinal cord barrier following spinal cord injury.
研究领域:
神经科学
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再生医学
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细胞生物学
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Neural Regeneration Research
·
2026
·
IF 6.7
Wu Jinting,Hao Peng,Duan Hongmei,Zhao Wen,Gao Yudan,Cui Zhiqiang,Yang Zhaoyang,Li Xiaoguang
Activation and neuronal differentiation of endogenous neural stem/progenitor cells within the hippocampal neurogenic niche (a neurogenic region) of the adult mammalian brain are considered potential bases for restoration of cognitive and memory functions. However, following traumatic cortical brain injury (i.e., injuries in a non-neurogenic region), the local microenvironment becomes hostile due to the presence of inhibitory factors such as inflammation, edema, and hypoxic–ischemic stress. These conditions hinder the migration and subsequent neuronal differentiation of activated neural stem/progenitor cells into the injured cortex. Numerous recent studies have confirmed that biomaterials can improve the microenvironment of the injured area and promote nerve regeneration. In this study, we report the findings obtained by injecting a biodegradable chitosan–gelatin–collagen gel into the cortical lesion area. We observed that the chitosan–gelatin–collagen gel established a permissive microenvironment for neural repair by suppressing inflammation and scar infiltration while promoting neovascularization. Thus, it enabled activated endogenous “seed” cells, i.e., neural stem/progenitor cells, to migrate into the cortical lesion area and generate new neurons and thereby facilitate functional recovery. These findings represent a novel biomaterial-based therapeutic strategy for the treatment of traumatic cortical brain injury, stroke, and other neurological disorders.
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CHINESE JOURNAL OF PHYSIOLOGY
·
2023
·Vol. 66
·期 6
·437
·
IF 1.8
Fan Wenbo,Zhou Jianwu
Parkinson's disease (PD) is recognized as a degenerative and debilitating neurodegenerative disorder. The novel protective role of icariside II (ICS II) as a plant-derived flavonoid compound in neurodegenerative diseases has aroused much attention. Herein, the definite impacts of ICS II on the process of PD and the relevant action mechanism were studied. Human neuroblastoma SK-N-SH cells were challenged with 1-methyl-4-phenylpyridinium ion (MPP + ) to construct the PD cell model. MTT assay and flow cytometry analysis, respectively, appraised cell viability and apoptosis. Caspase 3 Activity Assay examined caspase 3 activity. Corresponding kits examined oxidative stress levels. BODIPY 581/591 C11 assay evaluated lipid reactive oxygen species. Iron Assay Kit assessed iron content. Western blot tested the expression of apoptosis-, ferroptosis- and Kelch-like ECH-associated protein 1 (Keap1)/nuclear factor erythroid 2-related factor 2 (Nrf2)/glutathione peroxidase 4 (GPX4) signaling-associated proteins. Molecular docking verified the binding of ICS II with Keap1. The existing experimental results unveiled that ICS II elevated the viability whereas reduced the apoptosis, oxidative stress, and ferroptosis in MPP + -treated SK-N-SH cells in a concentration-dependent manner. Furthermore, ICS II declined Keap1 expression while raised Nrf2, heme oxygenase 1, and GPX4 expression. In addition, ICS II had a strong binding with Keap1 and Nrf2 inhibitor ML385 partially abolished the suppressive role of ICS II in MPP + -triggered apoptosis, oxidative stress, and ferroptosis in SK-N-SH cells. To summarize, ICS II might inhibit apoptosis, oxidative stress, and ferroptosis in the MPP + -stimulated PD cell model, which might be due to the activation of Keap1/Nrf2/GPX4 signaling.
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CHINESE JOURNAL OF PHYSIOLOGY
·
2023
·Vol. 66
·期 6
·516
·
IF 1.8
Zhang Zhongyuan,Wang Wei
Acute lung injury (ALI) is classified as a devastating pulmonary disorder contributing to significant incidence and fatality rate. Irbesartan (IRB) is an angiotensin II receptor blocker that has been proposed to protect against oleic acid-induced ALI. To this end, the current study is concentrated on ascertaining the role of IRB in ALI and figuring out the probable action mechanism. First, cell counting kit-8 (CCK-8) appraised the viability of human pulmonary microvascular endothelial cells (HPMVECs) exposed to ascending concentrations of IRB. HPMVEC injury model and a mouse model of ALI induced by lipopolysaccharide (LPS) were pretreated by IRB. In vitro , cell viability was estimated by CCK-8 assay, and lactate dehydrogenase (LDH) release was tested by LDH assay kit. Enzyme-linked immunosorbent assay (ELISA) and Western blotting estimated the expression levels of inflammatory factors. Fluorescein isothiocyanate–dextran was used to assess HPMVEC permeability. Western blotting examined the expression of adherent and tight junction proteins. In vivo , hematoxylin and eosin staining evaluated lung tissue damage and lung wet/dry (W/D) weight was measured. ELISA analyzed the levels of inflammatory factors in the serum and bronchoalveolar lavage fluid (BALF), and Western blotting examined the expression of inflammatory factors. The total cell, neutrophil, and macrophage numbers in BALF were determined using a cell counter. Lung capillary permeability was assayed by Evans blue albumin and total protein concentration in BALF was measured using bicinchoninic acid method. Immunofluorescence assay and Western blotting examined the expression of adherent and tight junction proteins in lung tissues. It was observed that IRB dose-dependently enhanced the viability while reduced LDH release, inflammatory response as well as permeability in LPS-challenged HPMVECs in vitro . In addition, LPS-stimulated lung tissue damage, pulmonary edema, inflammatory response as well as lung capillary permeability in vivo were all reversed following IRB treatment. Collectively, IRB treatment might elicit protective behaviors against LPS-triggered ALI.
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Dermatologica Sinica
·
2025
·
IF 2.2
Peng Yan,He Ling,Yang Xiaoqiong,Zhao Aijie
Background: Androgenetic alopecia (AGA), a kind of nonscarring baldness, is an androgen-dependent autosomal dominant polymorphism. Compound glycyrrhizin (CG), a compound preparation-containing glycyrrhizin, aminoacetic, and methionine, has been used to treat alopecia areata. Objectives: Our study aimed to explore the role of CG in hair regrowth in testosterone-induced AGA mouse model and the proliferation of human hair dermal papilla cells (HDPCs) and the related molecular mechanisms. Methods: The AGA mouse model was established through the injection of testosterone. The in vivo therapeutic effects of CG on AGA were assessed by detecting skin color changes, hair growth time, average hair length, and histological score. Human HDPCs after CG treatment were subjected to CCK-8 assay to evaluate cell proliferation. The impacts of CG on growth factor expression and the Wnt/β-catenin signaling in mouse dorsal skins and HDPCs were determined by undertaking western blotting, reverse transcription-quantitative polymerase chain reaction, and immunofluorescence staining. The Wnt/β-catenin pathway inhibitor XAV939 was used to validate the beneficial role of Wnt/β-catenin pathway activation in CG-mediated hair growth. Results: Our results showed that CG facilitated new hair growth and increased hair follicle numbers on the depilated dorsal area of the model mice. Furthermore, CG administration upregulated p-GSK-3β, β-catenin, cyclin D1, Axin2, LEF1, fibronectin, and survivin levels in the dorsal skins of model mice. In vitro assays revealed that CG promoted cell proliferation, elevated the mRNA levels of growth factors-related genes (insulin-like growth factors-1 (IGF-1), fibroblast growth factor-2 (FGF-2), and hepatocyte growth factor (HGF)), and increased p-GSK-3β, β-catenin, cyclin D1, Axin2, LEF1, fibronectin, and survivin protein levels in HDPCs. Importantly, XAV939 treatment debilitated the promotion of CG on hair regrowth in model mice and human hair dermal papilla cell (HPDC) proliferation. Conclusion: The beneficial role of CG in hair regrowth in AGA mice and HDPC cell proliferation depends on the Wnt/β-catenin pathway activation and the subsequent growth factor production in hair follicles. These results imply the potential of CG in the treatment of AGA.
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PHYTOMEDICINE
·
2026
·
IF 11.3
Waimao Gao,Kaifan Hu,Guang Yang,Jie Pan,Xiao Xu,Pingping You,Kun Li,Yan Zhao,Xingyu Wang,Ying Xu
Background Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by progressive cognitive decline, the formation of amyloid-β plaques and neurofibrillary tangles, and synaptic dysfunction. Puerarin (PUE), an isoflavone C-glycoside extracted from Pueraria lobata , has demonstrated potential in attenuating AD-related cognitive decline; however, the mechanisms governing the effects of PUE remain incompletely understood. Purpose To investigate the mechanisms underlying PUE’s anti-AD effects. Methods Presenilin 1/2 conditional double knockout mice served as the AD model. Following one month of PUE administration, memory function was evaluated through behavioral testing, and hippocampal synaptic plasticity was assessed using electrophysiological recordings. D‑serine levels were quantified via ELISA. Additionally, Western blotting and qRT-PCR were employed to analyze the expression of glutamate receptor subunits and key enzymes involved in D‑serine metabolism. The mechanistic role of D‑serine was further validated through intrahippocampal D‑serine injections in mice and the application of a serine racemase (SR) inhibitor in N2a cells. Results PUE administration reversed memory impairment and enhanced both hippocampal long-term potentiation and synaptic transmission by increasing the open probability of N-methyl-D-aspartate receptor (NMDAR) channels. Furthermore, PUE elevated D‑serine levels and upregulated the expression of SR. Notably, these therapeutic effects were replicated by exogenous D‑serine and abolished by treatment with an SR inhibitor. Conclusion These findings indicate that PUE alleviates cognitive deficits by promoting SR-mediated D‑serine biosynthesis and subsequently restoring NMDAR activity. Accordingly, PUE represents a viable therapeutic candidate for the prevention and management of AD.
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JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
·
2017
·
IF 0.697
Yanni Miao,Qi Liu,Wei Wang,Li Liu,Li Wang
A new chiral capillary electrophoresis (CE) analytical method for the determination of six pairs of amino acid enantiomer-derivatized precapillary with 9-fluorenylmethoxycarbonyl chloride (FMOC) was developed. CE separation parameters such as the pH of background electrolyte, the boric acid concentration, the addition of D-fructose and isopropanol, and the effect of new binary chiral selectors on the electropherograms were investigated. Precapillary and in-capillary derivatization was compared as well. The results showed that enantiomeric separations were obtained with enantio-resolution (Rs) ranged from 2.61 to 9.99 for the FMOC-derivatized amino acid enantiomers except alanine with Rs 1.06. Precapillary derivatization method provides overall better Rs for nearly all the targets except FMOC-aspartate with efficiency up to 1.309 × 106 plates and limit of detection (LOD) down to 2.5 μM. This method was successfully applied to analyze the concentration of the D/L-glutamic acid and D/L-aspartate in seven rice wine samples.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuelong Xu,He Wang,Changrui Xing,Jianhao Zhang,Wenjing Yan
Bacterial infection has always posed a severe threat to public health. Gold nanoparticles (Au NPs) exhibit exceptional biocompatibility and hold immense potential in biomedical applications. However, their antibacterial effectiveness is currently unsatisfactory. Herein, a chiral antibacterial agent with high stability was prepared by the modification of Au NPs with d-cysteine with the assistance of polyethylene glycol (PEG). The as-synthesized d-cysteine/PEG-Au NPs (D/P-Au NPs) exhibited a stronger (99.5–99.9%) and more stable (at least 14 days) antibacterial performance against Gram-negative (Escherichia coli and Listeria monocytogenes) and Gram-positive (Salmonella enteritidis and Staphylococcus aureus) bacteria, compared with other groups. The analysis of the antibacterial mechanism revealed that the D/P-Au NPs mainly affected the assembly of ribosomes, the biosynthesis of amino acids and proteins, as well as the DNA replication and mismatch repair, ultimately leading to bacterial death, which is significantly different from the mechanism of reactive oxygen species-activated metallic antibacterial NPs. In particular, the D/P-Au NPs were shown to effectively accelerate the healing of S. aureus-infected wounds in mice to a rate comparable to or slightly higher than that of vancomycin. This work provides a novel approach to effectively design chiral antibacterial agents for bacterial infection treatment.
研究领域:
纳米技术
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生物医学工程
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微生物学
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药理学
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材料科学
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