Increased expression of CD40 ligand by peripheral blood mononuclear cells in patients with systemic lupus erythematosus     

LI Yu-jie  LI You-ji  YE Ren-gao  KONG Qing-yu  DONG Xiu-qing  YU Xue-qing 《园艺学报》2003,19(4):514-517

AIM:To investigate expression and function of CD40 ligand by peripheral blood mononuclear cells (PBMCs) in patients with systemic lupus erythematosus (SLE).METHODS:Expression of CD40 ligand by PBMCs in patients with SLE and control were examined by flow cytometric analysis before and after stimulated by phytohemagglutinin(PHA)and depressed by Dexamethasone(Dex). The correlation between expression of CD40 ligand and SLE activity index(SLEDAI) was analysed in patients with SLE.RESULTS:The expression of CD40 ligand by PBMCs in patients with active SLE was higher than that in patients with inactive SLE and control. Though the expression of CD40 ligang by PBMCs could be stimulated by PHA in three groups, it was the highest in patients with active SLE. Dex depressed the expression of CD40 ligand by PBMCs significantly in patients with SLE, but not in control. There was high positive correlation between expression of CD40 ligand and SLEDAI in patients with active and inactive SLE.CONCLUSION:Increased expression of CD40L by PBMCs in patients with SLE may play an important role in pathogenesis of SLE.  相似文献   

Functional differentiation of two general-odorant binding proteins in Hyphantria cunea (Drury) (Lepidoptera: Erebidae)     

Xiaoqing Zhang  Endang R. Purba  Jing Sun  Qing-He Zhang  Shuang-Lin Dong  Ya-Nan Zhang  Peng He  Dingze Mang  Longwa Zhang 《Pest management science》2023,79(9):3312-3325

  相似文献   

CD2配体在IBD和ND疫苗免疫应答中的佐剂效应研究     

陈德坤  潘多 《动物医学进展》1998,19(4):35-36

分别以猪源ＣＤ２配体协同新城疫（ＮＤ）Ⅳ疫苗免疫１８日龄鸡和绵羊源ＣＤ２配体协同法氏囊（ＩＢＤ）中等毒力疫苗免疫２５日龄鸡，采用β－微量法和琼脂扩散法测ＮＤ抗体及ＩＢＤ抗体水平。结果表明，两种ＣＤ２配体均能促进鸡体内特异性抗体的提前产生，并且试验组鸡抗体效价显著高于对照。  相似文献   

Caudatin sensitizes TRAIL-induced HepG2 cell apoptosis     

FEI Hong-rong  WANG Gui-ling  ZHAO Ying  ZHOU Hong-lei 《园艺学报》2015,31(2):279-283

AIM: To determine whether caudatin, a C₂₁ steroidal aglycone, enhances tumor necrosis factor-related apoptosis-inducing ligand(TRAIL)-associated HepG2 cell apoptosis. METHODS: Cell growth inhibition was determined by MTT assay and cell colony formation assay. The TUNEL apoptosis detection kit was used to analyze cell apoptosis, and the protein expression was examined by Western blotting. RESULTS: Combination of caudatin with TRAIL signi-ficantly reduced cell proliferation and increased the apoptotic rate of HepG2 cells compared with the use of each agent alone. This was evidenced by marked increases in caspase-3, caspase-7, caspase-9 and PARP cleavages in the cells treated with caudatin and TRAIL-compared with control group. Combination of caudatin with TRAIL also led to the strong suppression of survivin. CONCLUSION: Caudatin synergizes HepG2 cells to TRAIL-induced apoptosis by promoting the cleavages of caspase-3, caspase-7, caspase-9 and PARP and inhibiting the expression of survivin.  相似文献   

Composition and transformation of 1.4 nm minerals in cutan and matrix of alfisols in central China     

Li Huang  Wenfeng Tan  Fan Liu  Hongqing Hu  Qiaoyun Huang 《Journal of Soils and Sediments》2007,7(4):240-246

Background, Aims, and Scope  Hydroxy interlayered vermiculite (HIV) and vermiculite are commonly referred to as 1.4 nm minerals. In the subtropical soils of central China, the concentration of vermiculites decreased while that of HIVs increased gradually from north to south as the intensity of soil formation or eluviation increases in the same direction. The cutans in these soils closely interact with air, roots, microbes, water and dissolved ions in soils. Cutans may therefore be expected to exert an important influence on the formation of 1.4 nm minerals relative to the matrix soils. However, little is known about the transformation of 1.4 nm minerals in Alfisols in central China. Here, we investigate the compositional differences of 1.4 nm minerals in cutans and matrix soils, and the probable transformation of vermiculite to HIV or vice versa when sodium citrate and sodium acetate are added to matrix Alfisols. Methods  Cutans and matrix soils were separated from three soils in the northern subtropical zone in China. The samples were analyzed for Fe, Mn, exchangeable cations, organic matter(O.M.), pH, and clay minerals. To 10 mL of matrix soil, suspensions containing about 250 mg (oven-dry weight) of clay was added with 5 mL of 0.4 mol/dm³ or 2 mol/dm³ of sodium citrate or sodium acetate solution and 5 mL of 0.2 mol/dm³ mixed solutions of CaCl₂, Mg(NO₃)₂ and KCl. After its pH was adjusted to 6.0, the mixture was ‘incubated’ for 120 or 210 days (more than one season or half a year) during which period it was shaken for 1 hour every day. The clay mineral composition of the samples was determined after incubation. Results  Both vermiculites and HIVs were present in matrix soils, but only vermiculties were detected in cutans. The addition of organic ligands (citrate and acetate) promoted the transformation of HIV to vermiculite. This transformation was obvious for the matrix soils that had been incubated with 0.5 mol/dm³ sodium citrate for 210 days while sodium acetate was less effective in this regard. The promoting effect of organic ligands is dependent on type and concentration as well as incubation time. This would suggest the reverse transformation occurred in the formation of cutans compared with a vermiculite-to-HIV transformation in the subtropical soils of central China from north to south. Discussion  The position and environment of cutans in the B horizon together with the pH, organic matter and exchangeable base status in cutans seem conducive to the co-existence of vermiculite and HIV in the soils, but only vermiculite is found in cutans. The transformation of HIV to vermiculite in incubation experiments could be divided into two steps: 1) Cheluviation of organic matter to the interlayer hydroxy-aluminums from HIVs. 2) Rebasification of hydrated cations into the interlayers of vermiculites. Conclusions  The clay minerals in cutans can interact with organic ligands and nutrient elements excreted by roots. Under conditions of frequent wetting and drying and high pH, and when the concentrations of exchangeable bases, iron-manganese oxides, clays, and organic matter are high, the exchangeable cations can be incorporated into the interlayers of HIV, thereby promoting the partial transformation of HIV to vermiculite in rhizosphere soils. Recommendations and Perspectives  Cutan is at the interface of material and energy exchange involved in physical, chemical and biochemical reactions in the rhizosphere. These factors strongly affect the compositions of cutans. HIVs in (upper or adjacent) matrix soils may transform to vermiculites during cutan formation in these special soil environments. ESS-Submission Editor: Jizheng (Jim) He (jzhe@rcees.ac.cn)  相似文献   

人胎盘TRAIL基因的cDNA克隆及序列测定     

张明烽  唐爽  宋红卫 《西北农林科技大学学报(自然科学版)》2005,33(2):6-8,13

根据GeneBank(U37518)中TRAIL(肿瘤坏死因子相关的凋亡诱导配体)的cDNA序列,设计扩增引物。采用RT-PCR从人胎盘中扩增出TRAIL基因的全长cDNA。产物纯化后连至pGEM-TEasy载体,转化大肠杆菌DH5α。筛选阳性克隆菌,酶切鉴定并进行序列测定。结果表明,本试验成功地克隆了TRAIL基因的1039bp全长cDNA。  相似文献   

Echinacoside promotes bone regeneration by increasing OPG/RANKL ratio in MC3T3-E1 cells     

Fei Li  Yanan Yang  Panpan Zhu  Weina Chen  Dongli Qi  Xiupu Shi  Chunfeng Zhang  Zhonglin Yang  Ping Li 《Fitoterapia》2012

Echinacoside (ECH), isolated from Cistanche tubulosa (Schrenk) R. Wight stems, was subjected to in vitro experiments to investigate its bioactivities on proliferation, differentiation and mineralization of the osteoblastic cell line MC3T3-E1. MTT assay, the alkaline phosphatase (ALP) activity and calcium deposition were determined, and the secretion of collagen I (COL I), osteocalcin (OCN), osteoprotegerin (OPG) and receptor activator of nuclear factor-κB ligand (RANKL) were also assayed by enzyme-linked immunosorbent assay (ELISA). The results showed that ECH caused a significant increase in cell proliferation, ALP activity, COL I contents, OCN levels and an enhancement of mineralization in osteoblasts at the concentration range from 0.01 to 10 nmol·L^− 1 (p < 0.05), suggesting that ECH has a stimulatory effect on osteoblastic bone formation or has potential activity against osteoporosis. In addition, the ratio of OPG/RANKL also could be enhanced by ECH. These findings provide the potent evidence that ECH can promote bone regeneration in cultured osteoblastic MC3T3-E1 cells, which might be done by elevating the OPG/RANKL ratio, and potential evidence for echinacoside to be a promising drug or a lead compound in the development of disease-modifying drug to prevent osteoporosis.  相似文献   

OPG/RANKL/RANK系统的生理功能          下载免费PDF全文

王卫中 《家畜生态学报》2012,33(4):102-105,120

骨是一个代谢活跃的器官,在整个生命周期中都在进行不断的更新与重建。在骨形态发生和重建的过程中主要受到细胞因子和激素的调节,同时骨代谢也受到OPG/RANKL/RANK系统的调控。论文主要对骨骼生理结构与骨组织细胞之间的关系,骨代谢和骨的形成过程,OPG/RANKL/RANK系统的生理功能,OPG/RANKL/RANK系统的影响因子以及骨代谢紊乱所引起的疾病几个方面作一综述。  相似文献   

Evidence of dissolved trivalent manganese in acidic forest soils     

Constantin Lux  Tim Mansfeldt 《植物养料与土壤学杂志》2023,186(3):321-329

Background

Evidence of trivalent manganese (Mn³⁺) in the aqueous phase of soils is unknown so far although this strong oxidant has large environmental implications.

Aims

We aimed to modify a spectrophotometric protocol (porphyrin method) and to discriminate between Mn²⁺ and Mn³⁺ in the aqueous phase of forest soils based on kinetic modeling.

Methods

We investigated manganese speciation in 12 forest floor solutions and 41 soil solutions from an acidic forest site by adjusting pH and correcting for absorbance.

Results

The solutions showed broad ranges in pH (3.4−6.3), dissolved organic carbon (DOC, 1.78−77.1 mg C L⁻¹), and total Mn (Mn_T, 23.9−908 µg L⁻¹). For acidic solutions, a pH-buffer was added to increase the pH of the solutions to 7.5−8.0, and background absorption was corrected for colored solutions, that is, solutions high in DOC. This was done to accelerate the reaction kinetics and avoid overestimation of Mn_T concentrations. After the pH and color adjustments, the comparison of Mn_T concentrations between the porphyrin method and optical emission spectrometry showed good agreement. Trivalent Mn, which is stabilized by organic ligands, constitutes significant proportions in both forest floor solutions (10−87%) and soil solutions (0.5−74%).

Conclusions

The dissolved Mn³⁺ is present in acidic forest soils. Thus, we revise the paradigm that this species is not stable and encourage to apply the revised method to other soils.  相似文献   

Kinetics of Ligand-Controlled Release of Zinc in Acid Sulfate Paddy Soils     

Worachart WISAWAPIPAT  Aksarapak PONGPOM 《土壤圈》2019,29(2):216-223

The elevated solubility of zinc(Zn) in acid sulfate paddy soils can limit rice production and pose a risk of environmental pollution.However, little attention has been paid to the ligand-controlled release of Zn in these soils. Here we quantified the rate of ligandcontrolled Zn release in Thai acid sulfate paddy soils, using ethylenediaminetetraacetic acid as the extractant. Sequential extractions were performed to obtain quantitative information on Zn fractions contributing to the ligand-controlled mechanisms. The amount of Zn released within 192 h varied significantly(8–43 mg kg~(-1)), which corresponded to 12%–40% of the total soil Zn, indicating that Zn solubility in most soils was relatively low and that Zn mainly occurred as residual phases. The kinetics of Zn release was well described by the power function model(r = 0.65–0.99, median = 0.87). The magnitude of initial Zn release(coefficient a) was significantly(P 0.05) related to the aqua regia-soluble Zn. Easily mobile Zn, organically bound Zn, and Zn associated with Fe and Mn oxides also contributed to the ligand-controlled release mechanisms to various degrees. Our results provide a systematic understanding of Zn fractions and release from acid sulfate paddy soils, the dynamics of which have a significant influence on the availability, phytoextraction, and mobility of Zn in terrestrial and engineered environments.  相似文献