Biospecific reversible immobilization

Immobilized lectins placed in continuous flow systems were used for biospecific reversible immobilization of labile biochemical structures, e.g., enzymes such as ascorbic acid oxidase and acetylcholine esterase, and cells, such as red blood cells and lymphocytes. The species thus immobilized were applied in continuous flow analytical processes.     

N,N一二甲基甲酞胺对人淋巴细胞的低温保护作用带

本文报道了N,N·二甲基甲酸胺(DMF)对冻存人外周血淋巴细胞，具有底温保护作用.实验结果表明，淋巴细胞在含有lob DMF和40%人AB型血清的1640液内冻存40至90天后，获得很高的存活率，并且超微结构完整，细胞凝集也较少.虽然在室温时，DMF对淋巴细胞有一定的毒性，DNA合成能力有所降低，但仍是一种优良的细胞低温保护剂.     

头孢噻肟对人外周血淋巴细胞钙信号转导作用的研究

以人外周血淋巴细胞为模型,利用稳态荧光法研究该模型在外源药物头孢噻肟刺激下,细胞钙稳态的变化,同时考察了钙-ATP酶活性与钙稳态之间的关系.研究发现,在低浓度组的头孢噻肟钠(0.005 g/L)刺激下,淋巴细胞内钙离子浓度略有增加,而胞外的钙离子浓度几乎没有发生变化.当药物浓度继续增加,胞内钙离子浓度逐渐减少,药物浓度与胞内钙离子浓度呈现出一定的剂量效应关系.不同药物处理组的钙-ATP酶活性与对照组相比均降低,呈现出一定的剂量-效应关系.     

A New Fluorescent Probe, ABM: Properties and Application in Clinical Diagnostics

Properties of benzanthrone aminoderivative ABM (conditional name) as a potential fluorescent probe were investigated. Spectral characteristics of the compound in different solvents as well as their binding to model lipid membranes (liposomes) and human peripheral blood mononuclear cells (lymphocytes; ly) were determined. The fluorescence was found to be sensitive polarity changes to the environment. Distinctions were observed in the spectral characteristics of the investigated compound when bounded to liposomes. It was established that spectral characteristics of ABM in cell suspension qualitatively characterize the structural and functional alterations of ly during pathological phenomena and correlate directly with the clinical view of disease. The ABM is shown to be a perspective in the screening for various pathologies.     

Individualized Dosage of Tacrolimus for Renal Transplantation Patients Based on Pharmacometabonomics

The clinical pharmacodynamics of tacrolimus in renal transplant patients has significant interindividual variability. T lymphocytes were selected to study the pharmacodynamic response of tacrolimus, which was significantly correlated with renal function and the outcome of renal transplant patients. Ultra-performance liquid chromatography–quadrupole time-of-flight mass spectroscopy (UPLC/Q-TOF-MS) was performed to obtain the metabolic profiles of 109 renal transplant patients. A partial least squares (PLS) model was constructed to screen potential biomarkers that could predict the efficacy of tacrolimus. Multinomial logistic regression analysis established a bridge that could quantify the relationship between the efficacy of tacrolimus and biomarkers. The results showed a good correlation between endogenous molecules and the efficacy of tacrolimus. Metabolites such as serum creatinine, mesobilirubinogen, L-isoleucine, 5-methoxyindoleacetate, eicosapentaenoic acid, N₂-succinoylarginine, tryptophyl-arginine, and butyric acid were indicated as candidate biomarkers. In addition, the key biomarkers could correctly predict the efficacy of tacrolimus with an accuracy of 82.5%. Finally, we explored the mechanism of individual variation by pathway analysis, which showed that amino acid metabolism was significantly related to the efficacy of tacrolimus. Moreover, orthogonal partial least squares discriminant analysis (OPLS-DA) showed that there was no difference in key metabolites among different pharmacodynamic groups at 1 month and 3 months after dose adjustment, suggesting that pharmacometabonomics is a useful tool to predict individual differences in pharmacodynamics and thus to facilitate individualized drug therapy.     

再循环B淋巴细胞昼夜节律现象的数学模型

根据免疫系统中参与再循环过程的B淋巴细胞昼夜节律现象的实验结果,提出皮质类激素作用于B淋巴细胞再循环过程的假设,建立了皮质类激素作用下的B细胞在骨骨,外周淋巴器官（淋巴结,脾脏）与因液之间再循环过程的数学模型,讨论了皮质类激素作用的强度及有关参量的取值范围及模型对参数的依赖性,模型能够解释参与再循环的B细胞在骨髓,淋巴结,脾脏和血液中的稳定振荡行为,而且对皮质激素在骨髓与外周血中B细胞迁移过程中的作用进行了定量研究,理论结果与实验结果基本一致。     

LBP-D单用及与降糖药联合应用对四氧嘧啶糖尿病小鼠血糖和免疫功能的影响

采用四氧嘧啶静脉注射（１００ｍｇ／ｋｇ）诱导的糖尿病小鼠模型,观察枸杞多糖－Ｄ（ＬＢＰ－Ｄ）单独及与降糖药联合应用对小鼠血糖和免疫功能的影响．研究表明,小鼠在注射四氧嘧啶后７２ｈ,ｉｇ给药,连续１０ｄ,可使糖尿病小鼠血糖明显降低,而且ＬＢＰ－Ｄ与降糖药（优降糖和二甲双胍）有联合降血糖作用;此外,ＬＢＰ－Ｄ可明显提高小鼠溶血素水平及调节Ｔ细胞亚群的功能,使四氧嘧啶糖尿病小鼠免疫功能接近正常．研究结果显示,ＬＢＰ－Ｄ对糖尿病小鼠的胰岛β细胞可能有保护作用,并对糖尿病模型小鼠有免疫调节治疗效应     

烷基酚类化合物对人外周血淋巴细胞DNA损伤的研究

烷基酚类化合物是一类污染十分广泛 ,且具有诱发某些肿瘤的环境内分泌干扰物 .应用单细胞凝胶电泳技术 ,研究了烷基酚类化合物对人外周血淋巴细胞DNA的损伤作用 .实验结果表明 ,9种烷基酚类化合物均能引起不同程度的DNA损伤 ,并呈现出剂量效应关系 .其高剂量组与对照组相比 ,均有极显著性差异 (p <0 .0 1) .实验结果亦表明 ,DNA的损伤程度与化学结构有一定的关系     

Cultivation of Encapsulated Primary Human B Lymphocytes: A First Step toward a Bioartificial Germinal Center

Polyelectrolyte microcapsules based on sodium cellulose sulfate (SCS) and poly-diallyl-dimethyl-ammonium chloride (PDADMAC) have previously been proposed as a suitable ex vivo microenvironment for the cultivation and differentiation of primary human T lymphocytes. Here, the same system is investigated for the cultivation of human primary B cells derived from adult tonsillar tissue. Proliferation and differentiation into subtypes are followed and compared to suspension cultures of B cells from the same pool performed in parallel. Total cell expansion is somewhat lower in the capsules than in the suspension cultures. More importantly, however, the differentiation of the initially mainly memory B cells into various subtypes, in particular into plasma cell (PC), shows significant differences. Clearly, the microenvironment provided by the microcapsules is beneficial for an accelerated induction of a germinal center-like B cell phenotype and afterward supports the long-term survival of the PC cells. Then, varying the encapsulation conditions (i.e., presence of human serum and dedicated cytokines in the capsule core) provides a tool for finetuning the B cell response. Hence, this methodology is suggested to pave the way toward ex vivo development of human immune organoids.     

Ex vivo evaluation of the effects of a white grape juice extract on lymphocytic mitochondrial functions

Abstract

The physio-pathological role of mitochondria in aging and age-related diseases has stimulated the search for compounds able to promote mitochondrial functionality. Our study was designed to evaluate the effect of a white grape juice extract (WGJe) on mitochondrial activity, in an ex vivo experimental model consisting of activated lymphocytes obtained from a younger age group and an older age group of subjects. WGJe steadily decreased the lymphocytic mitochondrial mass in the older subjects, without a relevant effect in their younger counterpart, and significantly enhanced Δψm in both groups investigated. Finally, WGJe reduced the endogenous mitochondrial production of H₂O₂ in all subjects. The results support the potential use of WGJe to improve mitochondrial functionality, thus maintaining human health and slowing down aging.