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抗菌肽抗菌机制及其应用研究进展 被引量:23
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作者 王兴顺 耿艺介 +1 位作者 李文楚 邓平建 《微生物学免疫学进展》 2012年第4期70-76,共7页
抗菌肽是一类小分子肽,具有广谱的抗菌活性。以往对抗菌肽抗菌机制的研究主要集中在细菌细胞膜的作用上,包含"桶板"模型、"毯式"模型,"环形孔"模型和"凝聚"模型。近年来相继发现某些抗菌肽可... 抗菌肽是一类小分子肽,具有广谱的抗菌活性。以往对抗菌肽抗菌机制的研究主要集中在细菌细胞膜的作用上,包含"桶板"模型、"毯式"模型,"环形孔"模型和"凝聚"模型。近年来相继发现某些抗菌肽可以作用于细菌细胞内部,与核酸物质结合,阻断DNA复制、RNA合成;影响蛋白质合成;抑制隔膜、细胞壁合成,阻碍细胞分裂;抑制胞内酶的活性。本文从胞内机制和胞外机制两个角度对抗菌肽的抗菌机制进行综述,以期阐明各类抗菌肽的作用机制,为进一步研究菌株耐药性、杀菌效果及其杀菌机制提供科学根据。 展开更多
关键词 抗菌肽 抗菌活性 机制 胞外机制
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微生物电解池催化CO_(2)电转化为甲烷:影响因素、电子传递和展望
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作者 王佳懿 陆雪琴 甄广印 《环境化学》 CAS CSCD 北大核心 2024年第2期393-404,共12页
化石燃料作为能源供应的主要来源,燃烧导致大量CO_(2)的释放和温室效应,CO_(2)的捕获和再利用越来越受到人们的关注.微生物电解池(MEC)作为一种新的CO_(2)再利用技术,可通过将电活性微生物与电化学刺激相结合,将CO_(2)通过生物电化学作... 化石燃料作为能源供应的主要来源,燃烧导致大量CO_(2)的释放和温室效应,CO_(2)的捕获和再利用越来越受到人们的关注.微生物电解池(MEC)作为一种新的CO_(2)再利用技术,可通过将电活性微生物与电化学刺激相结合,将CO_(2)通过生物电化学作用回收为低碳燃料(如CH_(4)),从而实现CO_(2)固定和能量回收.尽管近年来MEC领域有较多研究,但仍然存在许多问题阻碍了该技术的规模化和产业化.本文梳理了CO_(2)电化学产甲烷的工作原理、性能影响的关键因素、生物阴极电活性功能微生物及其胞外电子传递机制、电催化耦合技术的最新研究进展,提出了MEC辅助CO_(2)电甲烷化技术的未来研究需求和挑战. 展开更多
关键词 微生物电解池(MEC) CO_(2)电甲烷化 阴极材料 电活性功能菌 电子传递机制
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Cellular and molecular mechanisms of intestinal fibrosis 被引量:34
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作者 Silvia Speca Ilaria Giusti +1 位作者 Florian Rieder Giovanni Latella 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第28期3635-3661,共27页
Fibrosis is a chronic and progressive process characterized by an excessive accumulation of extracellular matrix (ECM) leading to stiffening and/or scarring of the involved tissue. Intestinal fibrosis may develop in s... Fibrosis is a chronic and progressive process characterized by an excessive accumulation of extracellular matrix (ECM) leading to stiffening and/or scarring of the involved tissue. Intestinal fibrosis may develop in several different enteropathies, including inflammatory bowel disease. It develops through complex cell, extracellular matrix, cytokine and growth factor interactions. Distinct cell types are involved in intestinal fibrosis, such as resident mesenchymal cells (fibroblasts, myofibroblasts and smooth muscle cells) but also ECM-producing cells derived from epithelial and endothelial cells (through a process termed epithelialand endothelial-mesenchymal transition), stellate cells, pericytes, local or bone marrow-derived stem cells. The most important soluble factors that regulate the activation of these cells include cytokines, chemokines, growth factors, components of the renin-angiotensin system, angiogenic factors, peroxisome proliferator-activated receptors, mammalian target of rapamycin, and products of oxidative stress. It soon becomes clear that although inflammation is responsible for triggering the onset of the fibrotic proc-ess, it only plays a minor role in the progression of this condition, as fibrosis may advance in a self-perpetuating fashion. Definition of the cellular and molecular mechanisms involved in intestinal fibrosis may provide the key to developing new therapeutic approaches. 展开更多
关键词 Inflammatory bowel disease Intestinal fibrosis Extracellular matrix Molecular mediators MYOFIBROBLASTS Inflammatory cells Epithelial cells Mesenchymal cells Endothelial cells
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Nectin-like Molecule 1 Inhibits the Migration and Invasion of U251 Glioma Cells by Regulating the Expression of An Extracellular Matrix Protein Osteopontin 被引量:2
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作者 Bin Yin Ke-han Li Tai An Tao Chen Xiao-zhong Peng 《Chinese Medical Sciences Journal》 CAS CSCD 2010年第2期100-104,共5页
Objective To investigate the molecular mechanism of nectin-like molecule 1(NECL1) inhibiting the migration and invasion of U251 glioma cells.Methods We infected U251 glioma cells with adeno-nectin-like molecule 1(Ad-N... Objective To investigate the molecular mechanism of nectin-like molecule 1(NECL1) inhibiting the migration and invasion of U251 glioma cells.Methods We infected U251 glioma cells with adeno-nectin-like molecule 1(Ad-NECL1) or empty adenovirus(Ad).Transwell and wound healing assays were performed to observe the migration of U251 cells incubated with the cell supernatant from Ad-NECL1 or Ad infected U251 cells.DNA microarray was applied to screen the gene expression profile after the restoration of NECL1 in U251 glioma cell lines.The differential expression of osteopontin(OPN),a gene related to migration and invasion,was further analyzed with semi-quantitative reverse transcription-polymerase chain reaction(RT-PCR),Western blot,and immunohistochemistry.Results The restoration of NECL1 inhibited migration of U251 cells significantly(P<0.05).Altogether 195 genes were found differentially expressed by microarray,in which 175 were up-regulated and 20 down-regulated,including 9 extracellular matrix proteins involved in the migration of cells.Both mRNA and protein expressions of OPN,the most markedly reduced extracellular matrix protein,were found decreased in U251 cells after restoration of NECL1.Immunohistochemical assay also detected an increase of OPN in glioma tissues,related with the progressing of malignant grade.Conclusion A link might exist between NECL1 and the extracellular matrix protein OPN in inhibiting the migration and invasion of U251 glioma cells. 展开更多
关键词 nectin-like molecule 1 glioma cell line extracellular matrix protein OSTEOPONTIN
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金属依赖型厌氧甲烷氧化研究进展
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作者 李侠 兰建英 蒋海明 《生态环境学报》 CSCD 北大核心 2021年第11期2257-2266,共10页
甲烷(CH_(4))是一种温室气体,其温室效应是二氧化碳的26倍。减少甲烷排放,可以缓解温室效应,有助于保护大气环境。微生物介导的甲烷厌氧氧化是调节甲烷向大气排放的关键过程。金属氧化物或金属离子可以作为甲烷厌氧氧化的电子受体,且金... 甲烷(CH_(4))是一种温室气体,其温室效应是二氧化碳的26倍。减少甲烷排放,可以缓解温室效应,有助于保护大气环境。微生物介导的甲烷厌氧氧化是调节甲烷向大气排放的关键过程。金属氧化物或金属离子可以作为甲烷厌氧氧化的电子受体,且金属依赖的甲烷厌氧氧化是减小全球甲烷排放的一个重要途径。虽然研究表明金属依赖型厌氧甲烷营养古菌可以促进这一过程,但其菌种、代谢途径及胞外电子传递途径尚缺乏深入研究。文章从金属依赖型厌氧甲烷氧化菌、金属依赖型厌氧甲烷氧化机制及金属依赖型厌氧甲烷氧化菌胞外电子传递机制等方面对金属依赖型厌氧甲烷氧化研究现状进行了概述,分析了金属依赖型厌氧甲烷氧化研究存在的问题,并讨论了其今后的研究方向,为金属依赖型厌氧甲烷氧化研究提供参考。 展开更多
关键词 甲烷 碳循环 厌氧甲烷氧化 金属依赖型厌氧甲烷营养古菌 铁(锰)氧化物 电子传递机制
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Mechanism of induction apoptosis of Onychin in ovarian cells in vitro 被引量:1
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作者 Yingxia Ning Jun Bai 《The Chinese-German Journal of Clinical Oncology》 CAS 2013年第8期389-392,共4页
Objective: The aim of the study was to investigate the possible mechanism of induction apoptosis of Onychin (ONY) in ovarian cancer HO-8910 cells in vitro. Methods: Human ovarian cancer HO-8910 cells were cultured... Objective: The aim of the study was to investigate the possible mechanism of induction apoptosis of Onychin (ONY) in ovarian cancer HO-8910 cells in vitro. Methods: Human ovarian cancer HO-8910 cells were cultured in vitro. Inhibi- tory effect of ONY on the viability of HO-8910 cells was evaluated by the MTT assay. Apoptosis of HO-8910 cells treated with different concentrations of ONY for 48 h was detected by FCM. Expression of proteins related to apoptosis was analyzed by Western blot. Results: ONY significantly inhibited the viability of human ovarian cancer HO-8910 cells in a dose-dependent and time-dependent manner, and the ICso was 10.48 pg/mL for 48 h. The cells treated with ONY showed typical morphological change of apoptosis and increased cells of sub-G1 population by FCM in a dose-dependent. Western blot showed that ex- pression of Bax, cytochrome C, caspase-9 and caspase-3 proteins were upregulated and protein level of Bcl-2 was depressed after treatment with ONY in a concentration dependent. Conclusion: Apoptosis of ovarian cancer HO-8910 cells was induced by ONY through mitochondrial apoptosis pathway in vitro. 展开更多
关键词 ovarian cancer Onychin (ONY) APOPTOSIS
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The inhibiting effects of Laggera alata flavone on human ovarian cancer HO-8910 cells proliferation and its mechanism in vitro
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作者 Min Tang Jun Bai +3 位作者 Chunyan Chen Yingxia Ning Xiaochun Li Hanzhen He 《The Chinese-German Journal of Clinical Oncology》 CAS 2014年第9期427-431,共5页
The purpose of this study was to investigate the effect of Laggera alata flavonen (LAF) on the inhibit- ing effect of human ovarian cancer HO-8910 cells proliferation and its possible mechanism in vitro. Methods: H... The purpose of this study was to investigate the effect of Laggera alata flavonen (LAF) on the inhibit- ing effect of human ovarian cancer HO-8910 cells proliferation and its possible mechanism in vitro. Methods: Human ovarian cancer HO-8910 cells were cultured in vitro. Inhibitory effect of LAF on the viability of HO-8910 cells was evaluated by the MTT assay. Apoptotic effect of different concentrations of LAF on HO-8910 cells was assessed by AO/EB staining and FCM with propidium iodide (PI) staining. Expression of proteins related to apoptosis was analyzed by Western blot. Results: LAF significantly inhibited the viability of HO-8910 cells proliferation in a dose-dependent and time-dependent manner, there were statistical significance compared with NS group (P 〈 0.05), and the ICso was 4.28 pg/mL for 48 h. The cells treated with LAF showed typical morphological change and apoptotic rate increased by FCM in a dose-dependent, and there was notable dif- ference compared with NS group (P 〈 0.05). Western blot showed that expression of Fas, caspase-8, tBid and Cyto-c proteins were up-regulated after treatment with LAF for 48 h in a concentration dependent. Conclusion: LAF could inhibit HO-8910 cells proliferation and induce apoptosis, which may be through the pathway of death receptor in vitro. 展开更多
关键词 ovarian cancer Laggera alata flavonen (LAF) APOPTOSIS
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Antineoplastic mechanism of Octreotide action in human hepatoma 被引量:4
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作者 陈绪军 刘志苏 艾中立 《Chinese Medical Journal》 SCIE CAS CSCD 2001年第11期47-50,106,共5页
Objectives To investigate whether apoptosis can be induced by Octreotide in human hepatoma cells in vitro and elucidate the antineoplastic mechanism of Octreotide in hepatoma.Methods A cultured human hepatoma cell lin... Objectives To investigate whether apoptosis can be induced by Octreotide in human hepatoma cells in vitro and elucidate the antineoplastic mechanism of Octreotide in hepatoma.Methods A cultured human hepatoma cell line,BEL-7402,was exposed to Octreotide and apoptosis was evaluated by cytochemical staining(Hochesst 33258),transmission electron microscopy,agarose gel electrophoresis and flow cytometry(FCM).Results After exposure to 0.2 μg/ml Octreotide,apoptosis with nuclear chromatin condensation as well as fragmentation,cell shrinkage and the formation of apoptotic bodies was observed using cytochemical staining and transmission electron microscopy.A DNA ladder in agarose gel electrophoresis was also displayed.FCM showed that the apoptotic cell number rose with an increase in the concentration of Octreotide(0- 2 iμg/ml).There was a positive correlation between Octreotide concentration and apoptotic rate in BEL-7402 cells(r=0.809,P<0.05).Conclusion Apoptosis in human hepatoma cells can be induced by Octreotide,which may be related to the mechanism of antineoplastic action of Octreotide in hepatoma. 展开更多
关键词 Octreotide liver neoplasm · apoptosis · in vitro · antineoplastic mechanism
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Effect of penehyclidine hydrochloride on patients with acute lung injury and its mechanisms 被引量:12
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作者 李百强 孙海晨 +3 位作者 聂时南 邵旦兵 刘红梅 钱晓明 《Chinese Journal of Traumatology》 CAS 2010年第6期329-335,共7页
Objective: To assess the effects of penehyclidine hydrochloride on patients with acute lung injury (ALI), to observe the expression of Toll-like receptor 4 (TLR4) on the peripheral monocytes of ALI patients and c... Objective: To assess the effects of penehyclidine hydrochloride on patients with acute lung injury (ALI), to observe the expression of Toll-like receptor 4 (TLR4) on the peripheral monocytes of ALI patients and changes of inflammatory & anti-inflammatory cytokines and to investigate the mechanism of TLR4 in ALI.Methods: Forty-five patients with ALI were randomly divided into penehyclidine hydrochloride treatment group (P group, n=21) and conventional treatment group (control group, C group, n=24). Patients in both groups received conventional treatment, including active treatment of the primary disease, respiratory support, nutritional support and fluid management therapy, while those in P group were given penehyclidine hydrochloride (1 mg, im, q. 12 h) in addition.The TLR4 expression of 20 healthy volunteers were detected.The clinical effect, average length of stay in ICU and hospital,values of PaO2 and PaO2/FiO2, expression of TLR4 on the surface of peripheral blood mononuclear cells and some serum cytokines were evaluated for 48 h.Results: The general conditions of the two groups were improved gradually and PaO2 increased progressively.Compared with 0 h, PaO2 and PaO2/FiO2 at 6, 12, 24 and 48 h after treatment were significantly increased (P<0.05). The improvement in P group was obviously greater than that in C group (P<0.05). The average length of hospitalization showed no difference between the two groups, but penehyclidine hydrochloride significantly decreased the average length of stay in ICU (t=3.485, P<0.01). The expression of TLR4 in two groups were both obviously higher than that of healthy volunteers (P<0.01). It decreased significantly at 24 h (t=2.032, P<0.05) and 48 h (t=3.620, P<0.01)and was lower in P group than in C group. The patients who showed a higher level of TLR4 expression in early stage had a worse prognosis and most of them developed acute respiratory distress syndrome (ARDS). The incidence of ARDS was 23.8% in P group and 29.17% in C group at 24 h.Until148 h, there were other two patients developing ARDS in control group. Serum IL-l, IL-8 and TNF-α expressions reduced after 24 h in both groups. The reduction in P group was more obvious than that in C group (P<0.05). IL-13 increased gradually from 0 h to 24 h, and decreased slightly at 48 h, which showed no difference between two groups (t=1.028, P>0.05).Conclusions: Penehyclidine hydrochloride improves the arterial oxygen pressure, down-regulates the expression of TLR4 and restrains the inflammatory cytokines in the downstream of TLR4 signaling pathway. It prevents the development of ALI and can be considered as an important drug in ALI treatment. 展开更多
关键词 PENEHYCLIDINE Acute lunginjury Wounds and injuries Toll-like receptor 4
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微生物种间直接电子传递研究进展 被引量:3
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作者 兰建英 蒋海明 李侠 《应用生态学报》 CAS CSCD 北大核心 2021年第1期358-368,共11页
一直以来氢气和甲酸被认为是微生物间电子传递的中间电子传递体。近年来的研究发现,微生物之间可以通过种间直接电子传递(DIET)来替代氢气/甲酸传递。DIET作为一种新发现的微生物间电子传递途径,其电子传递效率要高于传统的种间氢气/甲... 一直以来氢气和甲酸被认为是微生物间电子传递的中间电子传递体。近年来的研究发现,微生物之间可以通过种间直接电子传递(DIET)来替代氢气/甲酸传递。DIET作为一种新发现的微生物间电子传递途径,其电子传递效率要高于传统的种间氢气/甲酸传递。DIET这一新发现改变了微生物互营生长代谢必须依赖氢气或甲酸等电子载体的传统认识,为今后研究微生物互营现象打开了新视角。虽然DIET研究取得了很大进展,但是目前对能够进行DIET的微生物种类、DIET机制及影响DIET的因素尚缺乏深入研究。本文首先概述了能形成DIET的微生物,然后重点分析了能够进行DIET的电子供体微生物胞外电子传递的机制和电子受体微生物直接利用胞外电子的分子机制,最后阐述了导电材料对DIET的影响,并提出了DIET今后的研究方向,旨在为DIET研究提供参考。 展开更多
关键词 种间直接电子传递 电子供体微生物 电子受体微生物 互营生长 导电材料 电子传递机制
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Role of Extracellular Matrix in Acupoint Region in Acupuncture Effect
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作者 张志英 党瑞山 +5 位作者 金建华 黄轩 任丛莉 李亮 陈尔瑜 朱忠春 《Journal of Acupuncture and Tuina Science》 2006年第6期325-327,共3页
Objective: To investigate the action mechanism of extracellular matrix in acupoint region in acupuncture signal transmission. Methods: Forty SD rats, half male and half female, were randomly allocated to the experim... Objective: To investigate the action mechanism of extracellular matrix in acupoint region in acupuncture signal transmission. Methods: Forty SD rats, half male and half female, were randomly allocated to the experiment group, basic pain threshold group, normal saline group and acupuncture group, with 10 rats in each group, the tail temperature at which rat flicks its tail in heat radiation tail flick test was taken as an observation index. In experiment group, the rats were given acupuncture treatment 30 rain after injection of synthetic pentapeptide GRGDY (glycyl-arginyl-glycyl-aspartyl-tyrosine, Gly-Arg-Aly-Asp-Tyr) into "Housanli" area, basal pain threshold group, normal saline group which was given injection of 0.9% NaCl into "Housanli" area and acupuncture group which was given acupuncture at "Housanli" were used as controls. Results: As compared with acupuncture group, the temperature at which rat flicked its tail did not significantly changes following acupuncture 30 min after injection of GRGDY. Conclusion: GRGDY could not prevent the acupuncture effect, and the initial mechanism of acupuncture effect might have no relation to the structural site that extracellular matrix combines with integrin specially 展开更多
关键词 Point ST 36 RGD Extracellular matrix INTEGRIN
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