Immunosuppressive components ofAscaris suumdown-regulate expression of costimulatory molecules and function of antigen-presenting cellsvia an IL-10-mediated mechanism

2006 ◽  
Vol 36 (12) ◽  
pp. 3227-3237 ◽  
Author(s):  
Sandriana R. Silva ◽  
Jacqueline F. Jacysyn ◽  
Mahasti S. Macedo ◽  
Eliana L. Faquim-Mauro
Keyword(s):  
Costimulatory Molecules ◽  
And Function ◽  
Antigen Presenting

scholarly journals Age-Related Changes in Thymic Central Tolerance

2021 ◽  
Vol 12 ◽  
Author(s):  
Jayashree Srinivasan ◽  
Jessica N. Lancaster ◽  
Nandini Singarapu ◽  
Laura P. Hale ◽  
Lauren I. R. Ehrlich ◽  
...  
Keyword(s):  
T Cells ◽  
Negative Selection ◽  
Thymic Epithelial Cells ◽  
Central Tolerance ◽  
Adult Transition ◽  
Treg Function ◽  
Age Related ◽  
And Function ◽  
Antigen Presenting ◽  
Age Related Changes

Thymic epithelial cells (TECs) and hematopoietic antigen presenting cells (HAPCs) in the thymus microenvironment provide essential signals to self-reactive thymocytes that induce either negative selection or generation of regulatory T cells (Treg), both of which are required to establish and maintain central tolerance throughout life. HAPCs and TECs are comprised of multiple subsets that play distinct and overlapping roles in central tolerance. Changes that occur in the composition and function of TEC and HAPC subsets across the lifespan have potential consequences for central tolerance. In keeping with this possibility, there are age-associated changes in the cellular composition and function of T cells and Treg. This review summarizes changes in T cell and Treg function during the perinatal to adult transition and in the course of normal aging, and relates these changes to age-associated alterations in thymic HAPC and TEC subsets.

scholarly journals miR-221 and miR-155 regulate human dendritic cell development, apoptosis, and IL-12 production through targeting of p27kip1, KPC1, and SOCS-1

Blood ◽  
2011 ◽  
Vol 117 (16) ◽  
pp. 4293-4303 ◽  
Author(s):  
Changming Lu ◽  
Xin Huang ◽  
Xiaoxiao Zhang ◽  
Kristin Roensch ◽  
Qing Cao ◽  
...  
Keyword(s):  
Cytokine Signaling ◽  
Wild Type ◽  
Suppressor Of Cytokine Signaling ◽  
Hematopoietic Progenitor ◽  
Monocyte Differentiation ◽  
P27kip1 Protein ◽  
And Function ◽  
Antigen Presenting ◽  
Dc Maturation

Abstract Dendritic cells (DCs) are potent antigen-presenting cells derived from hematopoietic progenitor cells and circulating monocytes. To investigate the role of microRNAs (miRNAs) during DC differentiation, maturation, and function, we profiled miRNA expression in human monocytes, immature DCs (imDCs), and mature DCs (mDCs). Stage-specific, differential expression of 27 miRNAs was found during monocyte differentiation into imDCs and mDCs. Among them, decreased miR-221 and increased miR-155 expression correlated with p27kip1 accumulation in DCs. Silencing of miR-221 or overexpressing of miR-155 in DCs resulted in p27kip1 protein increase and DC apoptosis. Moreover, mDCs from miR-155−/− mice were less apoptotic than those from wild-type mice. Silencing of miR-155 expression had little effect on DC maturation but reduced IL-12p70 production, whereas miR-155 overexpression in mDCs enhanced IL-12p70 production. Kip1 ubiquitination-promoting complex 1, suppressor of cytokine signaling 1, and CD115 (M-CSFR) were functional targets of miR-155. Furthermore, we provide evidence that miR-155 indirectly regulated p27kip1 protein level by targeting Kip1 ubiquitination-promoting complex 1. Thus, our study uncovered miRNA signatures during monocyte differentiation into DCs and the new regulatory role of miR-221 and miR-155 in DC apoptosis and IL-12p70 production.

Impact of surface chemistry and topography on the function of antigen presenting cells

2015 ◽  
Vol 3 (3) ◽  
pp. 424-441 ◽  
Author(s):  
H. M. Rostam ◽  
S. Singh ◽  
N. E. Vrana ◽  
M. R. Alexander ◽  
A. M. Ghaemmaghami
Keyword(s):  
Surface Chemistry ◽  
Surface Topography ◽  
Antigen Presenting Cells ◽  
Biomaterial Surface ◽  
And Function ◽  
Antigen Presenting ◽  
The Impact

The impact of biomaterial surface topography and chemistry on antigen presenting cells’ phenotype and function.

Expression and function of Toll-like receptors on dendritic cells and other antigen presenting cells from non-human primates

2008 ◽  
Vol 125 (1-2) ◽  
pp. 18-30 ◽  
Author(s):  
Chutitorn Ketloy ◽  
Anneke Engering ◽  
Utaiwan Srichairatanakul ◽  
Amporn Limsalakpetch ◽  
Kosol Yongvanitchit ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
Antigen Presenting Cells ◽  
Toll Like Receptors ◽  
And Function ◽  
Antigen Presenting

scholarly journals Posttranslational Modifications and the Immunogenicity of Biotherapeutics

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Roy Jefferis
Keyword(s):  
Posttranslational Modifications ◽  
Drug Product ◽  
Molecular Forms ◽  
Phagocytic Cells ◽  
Production Platform ◽  
The Individual ◽  
And Function ◽  
Antigen Presenting

Whilst the amino acid sequence of a protein is determined by its gene sequence, the final structure and function are determined by posttranslational modifications (PTMs), including quality control (QC) in the endoplasmic reticulum (ER) and during passage through the Golgi apparatus. These processes are species and cell specific and challenge the biopharmaceutical industry when developing a production platform for the generation of recombinant biologic therapeutics. Proteins and glycoproteins are also subject to chemical modifications (CMs) bothin vivoandin vitro. The individual is naturally tolerant to molecular forms of self-molecules but nonself variants can provoke an immune response with the generation of anti-drug antibodies (ADA); aggregated forms can exhibit enhanced immunogenicity and QC procedures are developed to avoid or remove them. Monoclonal antibody therapeutics (mAbs) are a special case because their purpose is to bind the target, with the formation of immune complexes (ICs), a particular form of aggregate. Such ICs may be removed by phagocytic cells that have antigen presenting capacity. These considerations may frustrate the possibility of ameliorating the immunogenicity of mAbs by rigorous exclusion of aggregates from drug product. Alternate strategies for inducing immunosuppression or tolerance are discussed.

scholarly journals Regulatory T Cells in Human Ovarian Cancer

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Dong-Jun Peng ◽  
Rebecca Liu ◽  
Weiping Zou
Keyword(s):  
Ovarian Cancer ◽  
T Cells ◽  
Immune Suppression ◽  
Immune Cells ◽  
Clinical Settings ◽  
Human Ovarian Cancer ◽  
Cancer Microenvironment ◽  
Cellular Mechanisms ◽  
And Function ◽  
Antigen Presenting

Multiple layers of suppressive components including regulatory T (TReg) cells, suppressive antigen-presenting cells, and inhibitory cytokines form suppressive networks in the ovarian cancer microenvironment. It has been demonstrated that as a major suppressive element, TRegcells infiltrate tumor, interact with several types of immune cells, and mediate immune suppression through different molecular and cellular mechanisms. In this paper, we focus on human ovarian cancer and will discuss the nature of TRegcells including their subsets, trafficking, expansion, and function. We will briefly review the development of manipulation of TRegcells in preclinical and clinical settings.

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