磁化率能够衡量磁珠向磁力架迁移的速度,其大小取决于铁含量和氧化铁的特性。Dynabeads磁珠的磁化率是指质量磁化率,单位可以是cgs单位/g或m^3/kg(国际单位制)。对于亚铁磁性和铁磁性物质,质量磁化率取决于磁场强度(H),这些物质的磁化强度与H不是线性关系,而是随着场强增加而趋于饱和。因此, Dynabeads磁珠的质量磁化率是在固定条件下由标准操作程序而测定的。我们产品目录中给出的质量磁化率是国际单位制。磁化率由从高斯(cgs、emu)单位向国际单位的转换,是通过“高斯系数(emu/g或cgs/g)x 4π x 10^-3”而实现的。所得单位也被称为合理化质量磁化率,与(国际单位制)无量纲磁化率单位有所区别。通常,质量磁化率可用来衡量在非均匀磁场中影响物体的力(Fz)。测定Dynabeads磁珠的质量磁化率时,首先对样本称重,然后将样本放置于已知强度的磁场中。随后,再次称重得到样本重量(F1),并与关闭磁场时样本的重量(F0)进行对比。使用下述公式计算磁化率:K x 10^–3 = [(F1-F0) x m x 0.335 x 10^6],K表示质量为m的样本的质量磁化率。最后,将磁化率转换为国际单位制。
CD26: a negative selection marker for human Treg cells.
Authors:Salgado FJ, Pérez-Díaz A, Villanueva NM, Lamas O, Arias P, Nogueira M,
Journal:Cytometry A
PubMed ID:22949266
'A major obstacle hampering the therapeutic application of regulatory T (Treg) cells is the lack of suitable extracellular markers, which complicates their identification/isolation. Treg cells are normally isolated via CD25 (IL-2Ra) targeting, but this protein is also expressed by activated CD4(+) effector T (Teff) lymphocytes. Other extracellular (positive or negative) ... More
BRG1-mediated immune tolerance: facilitation of Treg activation and partial independence of chromatin remodelling.
Authors:Chaiyachati BH, Jani A, Wan Y, Huang H, Flavell R, Chi T,
Journal:EMBO J
PubMed ID:23321680
'Treg activation in response to environmental cues is necessary for regulatory T cells (Tregs) to suppress inflammation, but little is known about the transcription mechanisms controlling Treg activation. We report that despite the known proinflammatory role of the chromatin-remodelling factor BRG1 in CD4 cells, deleting Brg1 in all aß T ... More
PTD-hFOXP3 protein acts as an immune regulator to convert human CD4(+)CD25(-) T cells to regulatory T-like cells.
Authors:Liu X, Xu X, Lin X, Tian Y, Ji B, Xia S, Xu S, Yin Q, Zhang M, Jiao Z, Wang S, Xu H, Shao Q,
Journal:J Cell Biochem
PubMed ID:22806628
Regulatory T cells (Tregs) are critical for maintaining self-tolerance and homeostasis, and have potential application in clinical disease therapy, such as autoimmune diseases and transplant rejection, but their numbers are limited. FOXP3 is a key transcription factor controlling Tregs development and function. Although transfection of CD4(+)CD25(-) lymphocytes with the FOXP3 ... More
Effect of IFN-beta therapy on the frequency and function of CD4(+)CD25(+) regulatory T cells and Foxp3 gene expression in relapsing-remitting multiple sclerosis (RRMS): a preliminary study.
Authors:Namdar A, Nikbin B, Ghabaee M, Bayati A, Izad M,
Journal:J Neuroimmunol
PubMed ID:19932513
Interferon-beta (IFN-beta) is an immunomodulatory drug of choice to control relapsing-remitting multiple sclerosis (RR-MS), although its function is still unclear. A reduced suppressive function of CD4(+)CD25(+) regulatory T cells (T(reg)) has been shown in RR-MS patients. In this study, to understand the effect of IFN-ss on CD4(+)CD25(+) regulatory T cells, ... More
An optimized method for the functional analysis of human regulatory T cells.
Authors:Oberg HH, Wesch D, Lenke J, Kabelitz D,
Journal:Scand J Immunol
PubMed ID:16918705
Naturally occurring regulatory T cells (Treg) suppress the activation of antigen-responsive T cells in a cell contact-dependent manner. In order to investigate the impact of soluble mediators and receptor-ligand interactions on the interplay between naive T cells and Treg, a reproducible suppressor cell assay which functions in the absence of ... More