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DES-driven sustainable dual valorization of lignocellulose into carbon dots and porous biochar for effective wastewater remediation. 在 DES 驱动下,将木质纤维素可持续地转化为碳点和多孔生物炭,实现有效的废水修复。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137159
Si Hong, Aocheng Wei, Chao Xie, Xiaojun Shen, Jia-Long Wen, Tong-Qi Yuan

Deep eutectic solvents (DES) are renowned for their effectiveness in deconstructing lignocellulose and extracting lignin, yet the challenges lie in lignin condensation and the disposal of the DES remnants after pretreatment. To overcome these issues, this work proposed a holistic strategy utilizing deep eutectic solvent (DES)-driven lignocellulose deconstruction to upgrade lignocellulose into nitrogen-doped carbon dots (CDs) and iron-decorated porous carbons, serving as photocatalysts and adsorbents, respectively. These nitrogen-doped CDs via the choline chloride/FeCl3 DES pretreatment exhibited abundant nitrogen/oxygen functional groups, enhancing photocatalytic activities and facilitating effective charge separation and transfer. The photocatalytic efficiency of the CDs on dyes reached 97 % under acidic conditions primarily, and free radical quenching experiments indicated that singlet oxygen was the dominant oxidant species. Moreover, the adsorption capabilities of Fe-decorated porous carbons for Congo red reached 2432.3 mg·g-1, surpassing most existing carbon materials. The adsorption mechanism was due to a synergistic effect including physical adsorption, coordination, hydrogen bonding, electrostatic, and π-π interactions. This study proposed a synergetic conversion of DES and lignocellulose into functional carbon materials for wastewater remediation, which inspired the development of a green and cost-effective biorefinery.

深共晶溶剂(DES)因其在解构木质纤维素和提取木质素方面的有效性而闻名,但其面临的挑战在于木质素的凝结以及预处理后 DES 残留物的处理。为了克服这些问题,本研究提出了一种整体策略,利用深共晶溶剂(DES)驱动的木质纤维素解构,将木质纤维素升级为掺氮碳点(CD)和铁装饰多孔碳,分别用作光催化剂和吸附剂。通过氯化胆碱/FeCl3 DES 预处理的掺氮碳点表现出丰富的氮/氧官能团,增强了光催化活性,促进了有效的电荷分离和转移。主要在酸性条件下,CD 对染料的光催化效率达到 97%,自由基淬灭实验表明单线态氧是主要的氧化剂物种。此外,Fe 装饰多孔碳对刚果红的吸附能力达到 2432.3 mg-g-1,超过了大多数现有碳材料。吸附机理是由物理吸附、配位、氢键、静电和π-π相互作用等协同效应引起的。该研究提出了将 DES 和木质纤维素协同转化为功能性碳材料用于废水修复的方法,为开发绿色、经济的生物精炼厂提供了启发。
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引用次数: 0
Discovery of broad-spectrum high-affinity peptide ligands of spike protein for the vaccine purification of SARS-CoV-2 and Omicron variants. 发现用于 SARS-CoV-2 和 Omicron 变种疫苗纯化的尖峰蛋白广谱高亲和力肽配体。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137059
Jing Ma, Yongdong Huang, Guodong Jia, Xiaoyan Dong, Qinghong Shi, Yan Sun

To combat with emerging SARS-CoV-2 variants of concern (VOCs), we report the identification of a set of unique HWK-motif peptide ligands for the receptor-binding domain (RBD) of the SARS-CoV-2 spike (S) protein from a phage-displayed peptide library. These HWK-motif peptides exhibited nanomolar affinity for RBD. Among them, the peptide, HWKAVNWLKPWT (SP-HWK), had not only the highest affinities for RBD and trimer S protein, but also broad-spectrum affinities for RBDs from VOCs. Molecular dynamics simulations and competitive ELISA revealed a conserved pocket between the cryptic and the outer faces of RBD for SP-HWK binding, distinct from the human angiotensin-converting enzyme 2 receptor binding site. By coupling SP-HWK to agarose gel, the as-prepared affinity gel could efficiently capture RBD and trimer S from the ancestral strain and the Omicron variant, and the bound targets could be recovered by mild elution at pH 6.0. More importantly, the affinity gel presented excellent and stable chromatographic performance in the purification of inactivated SARS-CoV-2 and Omicron vaccines, affording high yields and purities, and strong HCP reduction. The results demonstrated the potential of SP-HWK as a broad-spectrum peptide ligand for developing a universal platform for the vaccine purification of SARS-CoV-2 and VOCs.

为了应对新出现的 SARS-CoV-2 变异体(VOCs),我们报告了从噬菌体展示的肽库中鉴定出的一组独特的 HWK-motif肽配体,它们与 SARS-CoV-2 穗状(S)蛋白的受体结合域(RBD)结合。这些HWK-motif多肽对RBD具有纳摩尔级的亲和力。其中,肽 HWKAVNWLKPWT(SP-HWK)不仅对 RBD 和三聚 S 蛋白具有最高的亲和力,而且对来自 VOCs 的 RBD 具有广谱亲和力。分子动力学模拟和竞争性酶联免疫吸附试验发现,在 RBD 的隐蔽面和外侧面之间有一个保守的口袋与 SP-HWK 结合,该口袋与人类血管紧张素转换酶 2 受体结合位点不同。通过将 SP-HWK 与琼脂糖凝胶偶联,制备的亲和凝胶可有效捕获祖代菌株和 Omicron 变体的 RBD 和三聚体 S,并可在 pH 值为 6.0 的条件下通过温和洗脱回收结合的目标物。更重要的是,该亲和胶在纯化 SARS-CoV-2 和 Omicron 灭活疫苗时具有优异稳定的色谱性能,产率高,纯度高,HCP 降解能力强。结果表明,SP-HWK 作为一种广谱多肽配体,具有开发 SARS-CoV-2 和 VOC 疫苗纯化通用平台的潜力。
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引用次数: 0
Exploring the interaction of curcumin with β-cyclodextrin and its binding with DNA: A combined spectroscopic and molecular docking study 探索姜黄素与β-环糊精的相互作用及其与 DNA 的结合:光谱和分子对接的综合研究。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137238
At present, a major effort in biophysical studies has been paid towards exploring the interactions and release of therapeutic payloads to the specific site leaving behind healthy cells unaffected and hence, lower the drug-induced toxicity. For the purpose, interaction of β-bound CUR with calf thymus DNA (ctDNA) has been examined intensely using a series of biophysical methods like absorption, steady state fluorescence emission, and circular dichroism together with molecular docking study. The experimental analysis divulge that CUR interacts with both β–CD (although with different molar ratio) and DNA. However, the binding affinity of CUR with the target (DNA) is higher than it does with the β–CD. When β–CD-carried (10 mM) CUR (μM) (inclusion complex) comes near DNA (15–372 μM), CUR gets out from β–CD's void and approaches to binds with the DNA. The relocation of the probe occurred due to competitive binding of the CUR between β–CD and the DNA. The present investigation may provide a simple yet probable route for the transfer of encapsulated therapeutic payload of β–CD to the most relevant biomolecular target DNA.
目前,生物物理研究的主要方向是探索治疗有效载荷与特定部位的相互作用和释放,使健康细胞不受影响,从而降低药物毒性。为此,我们使用一系列生物物理方法,如吸收、稳态荧光发射和圆二色性,并结合分子对接研究,对 β 结合的 CUR 与小牛胸腺 DNA(ctDNA)的相互作用进行了深入研究。实验分析表明,CUR 与 β-CD(尽管摩尔比不同)和 DNA 都有相互作用。但是,CUR 与目标物(DNA)的结合亲和力要高于与 β-CD 的结合亲和力。当β-CD携带的(10 mM)CUR(μM)(包涵复合物)靠近DNA(15-372 μM)时,CUR从β-CD的空隙中脱出,接近DNA并与之结合。探针的迁移是由于 CUR 与 β-CD 和 DNA 之间的竞争性结合造成的。本研究为将β-CD封装的治疗载荷转移到最相关的生物分子靶DNA提供了一条简单而可行的途径。
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引用次数: 0
A holocellulose air filter with highly efficient formaldehyde adsorption prepared via low temperature pulping and partial dissolving from corn stalks. 通过低温打浆和部分溶解玉米秸秆制备出具有高效甲醛吸附功能的全纤维素空气过滤器。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137164
Xingyu Wang, Qiuyue Hu, Xueping Wang, Xiaoran Zhang, Tian Si, Xin Gao, Lincai Peng, Keli Chen, Heng Zhang

Emissions of particulate matter (PM) originating from industrial and agricultural incineration had emerged as a significant public health concern. Furthermore, the considerable annual production of straw remains underutilized, particularly in China. In this study, we proposed a novel approach for holocellulose air filter production from corn stalks via low-temperature anthraquinone pulping, partial dissolving, and high-speed shear-induced regeneration. About 61.40-78.23 % of hemicellulose in corn stalks was retained in holocellulose, furthermore, the delignification rate was up to 81.63-92.51 % after low temperature (<100 °C) alkaline exactment. Subsequently, holocellulose air filters (RHF) was prepared through regeneration with high-speed shear induced (25,000 rpm) and freeze-drying. The final air filters contained approximately 8.56-12.4 % hemicellulose, exhibiting a substantial adsorption capacity for low molecules such as formaldehyde. The results revealed remarkably low PM2.5 penetration ratio (0.12 %) and pressure drop (14.3 Pa) of the air filter, while exhibiting a remarkable formaldehyde adsorption capacity of 54.5 mg/g. Moreover, the characters of high crystallinity index and robust micro/nano-structure of regenerated cellulose were obtained. This study introduced an innovative and facile strategy for gaseous formaldehyde adsorption and introduced novel solutions for agricultural waste utilization.

工业和农业焚烧产生的颗粒物(PM)排放已成为一个重大的公共健康问题。此外,每年生产的大量秸秆仍未得到充分利用,尤其是在中国。在这项研究中,我们提出了一种利用玉米秸秆通过低温蒽醌制浆、部分溶解和高速剪切诱导再生生产全纤维素空气过滤器的新方法。全纤维素保留了玉米秸秆中约 61.40%-78.23% 的半纤维素,而且在空气过滤器低温(2.5 渗透率(0.12%)和压降(14.3 Pa)条件下,脱木素率高达 81.63%-92.51%,同时表现出 54.5 mg/g 的显著甲醛吸附能力。此外,还获得了再生纤维素的高结晶度指数和坚固的微/纳米结构。这项研究为气态甲醛吸附引入了一种创新而简便的策略,并为农业废弃物的利用提供了新的解决方案。
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引用次数: 0
Graphene oxide, starch, and kraft lignin bio-nanocomposite controlled-release phosphorus fertilizer: Effect on P management and maize growth. 氧化石墨烯、淀粉和牛皮纸木质素生物纳米复合控释磷肥:对磷肥管理和玉米生长的影响
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137190
Badr-Eddine Channab, Fatima Tayi, Meryem Aqlil, Adil Akil, Younes Essamlali, Achraf Chakir, Mohamed Zahouily

This study focuses on the synthesis and practical application of bio-nanocomposite films made from a mixture of starch (ST) and Kraft lignin (KL) with graphene oxide (GO) nanoparticles. FTIR, XRD, Raman, SEM, and TEM analysis confirmed the synthesis's success of GO. The bio-nanocomposites were used as advanced coatings for triple superphosphate (TSP) fertilizers, and their implications for maize (Zea mays L.) plant growth were examined. Incorporating GO into the composite matrix is a significant accomplishment of this study, as demonstrated by the noticeable changes observed in the FTIR spectra, indicating consequent structural changes. Morphological analyses conducted by SEM reveal changes in the surface characteristics of the ST/KL films, providing essential information about the structural details of the bio-nanocomposite. The utilization of precision-coated TSP fertilizers leads to a significant enhancement in mechanical strength, as demonstrated by the improved crush resistance. Furthermore, these formulations guarantee a gradual release of phosphorus, showcasing their potential for efficient nutrient management in agricultural settings. The study examines the practical application of coated TSP fertilizers in agriculture and their positive effects on various growth parameters of Maize (Zea mays L.) plants. Using these fertilizers promotes sustainable and efficient agricultural practices, contributing to developing innovative agrochemical solutions.

本研究的重点是淀粉(ST)和牛皮纸木质素(KL)与氧化石墨烯(GO)纳米粒子混合物制成的生物纳米复合薄膜的合成和实际应用。傅立叶变换红外光谱(FTIR)、X 射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)和电子显微镜(TEM)分析证实了 GO 的成功合成。生物纳米复合材料被用作三过磷酸钙(TSP)肥料的高级涂层,并研究了其对玉米(Zea mays L.)植物生长的影响。傅立叶变换红外光谱中观察到的明显变化表明,将 GO 加入到复合基质中是本研究的一项重要成果,这也表明了随之而来的结构变化。通过扫描电镜进行的形态分析表明,ST/KL 薄膜的表面特征发生了变化,提供了有关生物纳米复合材料结构细节的重要信息。使用精密涂层的 TSP 肥料可显著提高机械强度,抗压性能的改善就证明了这一点。此外,这些配方还能保证磷的逐步释放,展示了其在农业环境中进行高效养分管理的潜力。本研究探讨了包衣 TSP 肥料在农业中的实际应用及其对玉米(Zea mays L.)植物各种生长参数的积极影响。使用这些肥料可促进可持续和高效的农业实践,有助于开发创新的农用化学品解决方案。
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引用次数: 0
Fabrication of high performance 2D flexible SERS substrate based on cellulose nanofibrils and its application for pesticide residue detection. 基于纤维素纳米纤维的高性能二维柔性 SERS 基底的制作及其在农药残留检测中的应用。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137115
Junjie Zhou, Wenhua Gao, Jinglin Wu, Zhouyang Xiang, Jinsong Zeng, Bin Wang, Jun Xu

Cellulose nanofibrils (CNFs) can serve as an efficient surface enhanced Raman scattering (SERS) platform for in situ detection of trace targets. In this study, a highly reproducible SERS platform based on TEMPO-oxidized CNFs (T-CNFs) was fabricated by the ion-exchange. Self-assembly of silver nanoparticles (AgNPs) was accomplished in only 120 s. The abundant carboxylate groups and good hydrophilicity of T-CNFs facilitated uniform and dense loading of AgNPs over the surface area. The obtained SERS substrate greatly enhanced the Raman signal of different pesticides, and the detection limits of thiram and thiabendazole were 5.81 × 10-8 M and 9.63 × 10-8 M, respectively. SERS substrate could produce homogeneous Raman-enhanced signals (relative standard deviation (RSD) = 6.59 %). In addition, due to the good flexibility, SERS substrate could collect and detect pesticide residues from the surface of apples. The intensities of Raman characteristic peak at 1384 cm-1 showed a good linear relationship with the analyte concentrations (0.96 ng/cm2-9600 ng/cm2). The constructed SERS substrate provided a theoretical basis for the preliminary rapid screening of hazardous chemical residues in food, which was of great value for the SERS technique to become a routine on-site analysis method for pesticide residues.

纤维素纳米纤维(CNFs)可作为一种高效的表面增强拉曼散射(SERS)平台,用于原位检测痕量目标。本研究通过离子交换法,在 TEMPO 氧化的 CNFs(T-CNFs)基础上制备了一种具有高度可重复性的 SERS 平台。银纳米粒子(AgNPs)的自组装只需 120 秒即可完成。T-CNFs 具有丰富的羧酸基团和良好的亲水性,有利于 AgNPs 在其表面区域均匀、密集地负载。所获得的 SERS 基底大大增强了不同农药的拉曼信号,噻虫嗪和噻苯咪唑的检测限分别为 5.81 × 10-8 M 和 9.63 × 10-8 M。SERS 底物能产生均匀的拉曼增强信号(相对标准偏差 (RSD) = 6.59 %)。此外,由于 SERS 底物具有良好的柔韧性,因此可以收集和检测苹果表面的农药残留。1384 cm-1 处的拉曼特征峰强度与分析物浓度(0.96 ng/cm2 - 9600 ng/cm2)呈良好的线性关系。所构建的 SERS 底物为初步快速筛查食品中的有害化学物质残留提供了理论依据,对 SERS 技术成为常规的农药残留现场分析方法具有重要价值。
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引用次数: 0
Starch-pectin smart tag containing purple carrot peel anthocyanins as a potential indicator of analogous meat freshness. 含有紫色胡萝卜皮花青素的淀粉-pectin 智能标签是类比肉类新鲜度的潜在指标。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-03 DOI: 10.1016/j.ijbiomac.2024.137161
Julia Rabelo Vaz Matheus, Carollyne Maragoni-Santos, Thalita Ferreira de Freitas, Emily Farias Costa Hackbart, Regiane Ribeiro-Santos, Daniel Perrone, Ana Maria Furtado de Sousa, Cláudia Leites Luchese, Cristiano José de Andrade, Ana Elizabeth Cavalcante Fai

Smart films of starch/pectin and purple carrot peel (PCP) containing anthocyanins were developed, characterized, and used as pH-responsive tags to monitor plant-based chicken analogous. This study innovates by incorporating PCP in the film solution both as an extract and as a powder, and the resulting tags were applied to a plant-based food. PCP powder <100-mesh was directly incorporated into the film-forming suspension. For powder >100-mesh, two extracts were tested: an aqueous solution and a 1 % NADES solution added to the film-forming suspension. Quantification of PCP anthocyanins by HPLC showed a higher extraction under acidic conditions (1664 mg C3G equivalents 100 g-1). Films with PCP presented greater light protection. Films with 15 % and 25 % PCP and those with added extract showed better tensile strength (3.0-3.6 MPa), elongation at break (16-20 %) and a water contact angle of 52°. All films responded to pH variations (1 to 14) and ammonia vapor and showed ΔE* values >5. After 3 days, films used as smart tags monitoring chicken analogous presented noticeable color differences for PCPNADES (55 ± 8) and 15%PCP (40 ± 1). PCP showed strong potential as a pigmenting agent in films, especially as an aqueous extract with NADES for use as pH-responsive tags in chicken analogous.

该研究开发了含有花青素的淀粉/pectin 和紫胡萝卜皮(PCP)智能薄膜,对其进行了表征,并将其用作 pH 响应标签,以监测类似的植物性鸡肉。本研究创新性地将五氯苯酚以提取物和粉末两种形式加入薄膜溶液中,并将所得标签应用于植物性食品。五氯苯酚粉末 100 目,测试了两种提取物:水溶液和添加到成膜悬浮液中的 1 % NADES 溶液。通过 HPLC 对五氯苯酚花青素进行定量,结果表明在酸性条件下提取率更高(1664 毫克 C3G 当量 100 克-1)。含有五氯苯酚的薄膜具有更强的防光性能。含有 15 % 和 25 % 五氯苯酚的薄膜以及添加了提取物的薄膜显示出更好的拉伸强度(3.0-3.6 兆帕)、断裂伸长率(16-20 %)和 52° 的水接触角。所有薄膜都对 pH 值变化(1 至 14)和氨蒸气有反应,ΔE* 值大于 5。3 天后,用作监测鸡肉类似物的智能标签的薄膜出现了明显的色差,五氯苯酚萘二甲酸酯(55 ± 8)和 15%五氯苯酚(40 ± 1)。五氯苯酚作为薄膜中的颜料剂显示出强大的潜力,尤其是作为水提取物与 NADES 一起用作鸡肉类似物中的 pH 响应标签。
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引用次数: 0
Acidic polysaccharides from Cistanche deserticola and their effects on the polarization of tumor-associated macrophages. 肉苁蓉酸性多糖及其对肿瘤相关巨噬细胞极化的影响
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137207
Siliang Jiang, Yongsheng Cui, Bo Wang, Zheng Fu, Caixia Dong

Three purified polysaccharides, CDAP-1, CDAP-2, and CDAP-3, were prepared from the rhizome of Cistanche deserticola and characterized. Structural analysis revealed that CDAP-1 and CDAP-2 are highly branched RG-I-type polysaccharides with side chains, including arabinans, galactans, and/or AGs, whereas CDAP-3 is a typical HG-type polysaccharide. In vivo tests revealed that treatment with the crude polysaccharide fraction (CDCP) significantly prolonged the survival of H22 tumor-bearing mice and exhibited antitumor effects. In vitro experiments demonstrated that all three polysaccharides could polarize M2-like TAMs toward the M1 phenotype. As a major component of CDCP, CDAP-2 could act on M2 macrophages through the TLR4 receptor-mediated NF-κB signaling pathway. An in vitro cell model verified that CDAP-2 could inhibit cell proliferation by reversing the polarization of M2-like TAMs to the cytotoxic M1 phenotype. Overall, we found that CDCP showed a clear antitumor effect and that its major component, CDAP-2, could reverse the suppressive TAM phenotype in the microenvironment, providing a scientific basis for the clinical application and development of C. deserticola.

从肉苁蓉根茎中制备了三种纯化的多糖,即 CDAP-1、CDAP-2 和 CDAP-3,并对其进行了表征。结构分析表明,CDAP-1 和 CDAP-2 是高度支化的 RG-I 型多糖,侧链包括阿拉伯聚糖、半乳糖和/或 AGs,而 CDAP-3 是典型的 HG 型多糖。体内试验表明,用粗多糖组分(CDCP)治疗可明显延长 H22 肿瘤小鼠的生存期,并具有抗肿瘤作用。体外实验表明,这三种多糖都能将 M2 样 TAMs 极化为 M1 表型。作为 CDCP 的主要成分,CDAP-2 可通过 TLR4 受体介导的 NF-κB 信号通路作用于 M2 巨噬细胞。体外细胞模型验证了 CDAP-2 可通过逆转 M2 样 TAMs 极化为细胞毒性 M1 表型来抑制细胞增殖。总之,我们发现 CDCP 具有明显的抗肿瘤作用,其主要成分 CDAP-2 可以逆转微环境中的抑制性 TAM 表型,为 C. deserticola 的临床应用和开发提供了科学依据。
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引用次数: 0
Extracellular matrix-mimicking cryogels composed of methacrylated fucoidan enhance vascularized skeletal muscle regeneration following volumetric muscle loss. 由甲基丙烯酸化褐藻糖胶组成的细胞外基质模拟低温凝胶可在肌肉体积损失后促进血管化骨骼肌再生。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137122
Dimulati Maimaiti, Xiaoyang Ge, Chengyue Wang, Jinuo Liu, Guanyu Yang, Dachuan Zhang, Yong Xu, Fan He, Xi Chen

Volumetric muscle loss (VML) significantly impairs the inherent regenerative ability of skeletal muscle and results in chronic functional impairment. Polysaccharides in the muscle extracellular matrix are crucial for regulating cell proliferation and differentiation. Recent studies indicate that fucoidan has beneficial effects on musculoskeletal conditions. However, the impact of fucoidan on skeletal muscle regeneration remains poorly understood. In this study, methacrylated fucoidan (FuMA) was synthesized through chemical grafting of the methacryloyl group onto fucoidan. In vitro experiments demonstrated that treatment with FuMA significantly up-regulated the expression of myogenic markers and promoted the formation of myotubes in C2C12 myoblast cells. Importantly, FuMA treatment led to a significant enhancement in mitochondrial energy metabolism of myoblasts via activation of the NRF2 antioxidant signaling pathway. To further investigate the regenerative properties in repairing skeletal muscle defects, we fabricated a dual crosslinked cryogel consisting of FuMA and methacrylated gelatin (GelMA) with a porous and interconnected structure. In a rat tibialis anterior muscle VML model, implantation of the FuMA/GelMA cryogel effectively promoted the regeneration of muscle fibers, reduced collagen deposition, and facilitated the formation of new blood vessels. Hence, polysaccharide-based cryogels represent a promising implantable biomimetic scaffold for facilitating skeletal muscle regeneration following severe injuries.

肌肉体积损失(VML)严重损害了骨骼肌固有的再生能力,并导致慢性功能障碍。肌肉细胞外基质中的多糖对调节细胞增殖和分化至关重要。最近的研究表明,褐藻糖胶对肌肉骨骼状况有益。然而,褐藻糖胶对骨骼肌再生的影响仍鲜为人知。本研究通过化学方法将甲基丙烯酰基接枝到褐藻糖胶上,合成了甲基丙烯酰化褐藻糖胶(FuMA)。体外实验表明,用褐藻糖胶处理C2C12肌母细胞后,可显著上调肌生成标志物的表达,并促进肌管的形成。重要的是,FuMA 处理可通过激活 NRF2 抗氧化信号通路,显著提高肌母细胞线粒体的能量代谢。为了进一步研究其修复骨骼肌缺陷的再生特性,我们制造了一种由 FuMA 和甲基丙烯酸明胶(GelMA)组成的双交联低温凝胶,这种凝胶具有多孔和相互连接的结构。在大鼠胫骨前肌 VML 模型中,植入 FuMA/GelMA 低温凝胶能有效促进肌纤维再生,减少胶原沉积,并促进新血管的形成。因此,基于多糖的低温凝胶是一种很有前景的植入式仿生支架,可用于促进严重损伤后的骨骼肌再生。
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引用次数: 0
Mitochondrial HKDC1 suppresses oxidative stress and apoptosis by regulating mitochondrial function in goose fatty liver 线粒体 HKDC1 通过调节鹅脂肪肝的线粒体功能抑制氧化应激和细胞凋亡。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137222
Different from human non-alcoholic fatty liver disease (NAFLD), goose fatty liver is physiological with no inflammation. Consistently, mitochondrial dysfunction, oxidative stress and apoptosis are rarely seen in goose fatty liver. Hexokinase domain-containing protein 1 (HKDC1) is involved in maintaining systemic glucose homeostasis, and its absence causes mitochondrial dysfunction. Here, we demonstrated that mitochondrial outer membrane-bound HKDC1 (mHKDC1) had an expression pattern different from that of whole-cell HKDC1 (wHKDC1). Data indicated that the protein level of whole-cell HKDC1 (wHKDC1) was increased but mHKDC1 was decreased in mouse fatty liver. Interestingly, both the protein levels of wHKDC1 and mHKDC1 were significantly increased in goose fatty liver. Treatment of goose or mouse hepatocytes with fatty liver-related factors could influence the expression of wHKDC1 and mHKDC1, but the influence on wHKDC1 was not identical to mHKDC1. HKDC1 overexpression in goose hepatocytes increased wHKDC1 and mHKDC1 expression, mitochondrial membrane potential (MMP), mitochondrial respiratory chain activity, and suppressed reactive oxygen species (ROS) generation, apoptosis and cytokine-cytokine receptor signaling pathway. In addition, mutations in mitochondrial signal peptide or activation domain of HKDC1 altered MMP or ROS levels. In conclusion, HKDC1, particularly mHKDC1, may protect goose fatty liver by regulating mitochondrial function, ROS generation, apoptosis, and inflammation-related pathways.
与人类非酒精性脂肪肝(NAFLD)不同,鹅脂肪肝是生理性的,没有炎症。一致的是,鹅脂肪肝很少出现线粒体功能障碍、氧化应激和细胞凋亡。含六磷酸酶结构域蛋白 1(HKDC1)参与维持全身葡萄糖稳态,它的缺失会导致线粒体功能障碍。在这里,我们证实线粒体外膜结合的 HKDC1(mHKDC1)与全细胞 HKDC1(wHKDC1)的表达模式不同。数据显示,在小鼠脂肪肝中,全细胞 HKDC1(wHKDC1)蛋白水平升高,而 mHKDC1 蛋白水平降低。有趣的是,在鹅脂肪肝中,wHKDC1 和 mHKDC1 的蛋白水平均显著升高。用脂肪肝相关因子处理鹅或小鼠肝细胞可影响 wHKDC1 和 mHKDC1 的表达,但对 wHKDC1 和 mHKDC1 的影响并不相同。HKDC1在鹅肝细胞中的过表达增加了wHKDC1和mHKDC1的表达、线粒体膜电位(MMP)、线粒体呼吸链活性,并抑制了活性氧(ROS)生成、细胞凋亡和细胞因子-细胞因子受体信号通路。此外,HKDC1 的线粒体信号肽或激活结构域突变也会改变 MMP 或 ROS 水平。总之,HKDC1(尤其是 mHKDC1)可通过调节线粒体功能、ROS 生成、细胞凋亡和炎症相关途径来保护鹅脂肪肝。
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International Journal of Biological Macromolecules
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