CD20(+) T cells have a predominantly Tc1 effector memory phenotype and are expanded in the ascites of patients with ovarian cancer.

Copyright © 2015 Taylor & Francis Group, LLCRecently, a small subset of T cells that expresses the B cell marker CD20 has been identified in healthy volunteers and in patients with rheumatoid arthritis and multiple sclerosis. The origin of these CD20-positive T cells as well as their relevance in human disease remains unclear. Here, we identified that after functional B cell/T cell interaction CD20 molecules are transferred to the cell surface of T cells by trogocytosis together with the established trogocytosis marker HLA-DR. Further, the presence of CD20 on isolated CD20(+) T cells remained stable for up to 48h of ex vivo culture. These CD20(+) T cells almost exclusively produced IFNγ (∼70% vs. ∼20% in the CD20(-) T cell population) and were predominantly (CD8(+)) effector memory T cells (∼60-70%). This IFNγ producing and effector memory phenotype was also determined for CD20(+) T cells as detected in the peripheral blood and ascitic fluids of ovarian cancer (OC) patients. In the latter, the percentage of CD20(+) T cells was further strongly increased (from ∼6% in peripheral blood to 23% in ascitic fluid). Taken together, the data presented here indicate that CD20 is transferred to T cells upon intimate T cell/B cell interaction. Further, CD20(+) T cells are of memory and IFNγ producing phenotype and are present in increased amounts in ascitic fluid of OC patients.Netherlands Organization for Scientific ResearchDutch Cancer SocietyAlexander von Humboldt Foundatio

The ever-expanding immunomodulatory role of calreticulin in cancer immunity.

This is a freely-available open access publication. Please cite the published version which is available via the DOI link in this record.Calreticulin is a pleiotropic molecule that normally resides in the lumen of the endoplasmic reticulum (ER). Here, it has various functions, ranging from regulation of calcium homeostasis to ensuring proper protein folding. More recently, calreticulin gained special interest for its extracellular functions, where it has direct immunomodulatory activity. In this respect, calreticulin activates dendritic cells and macrophages. In addition, certain anti-cancer therapies induce the translocation of calreticulin from the ER to the cell surface of dying cancer cells, where calreticulin dictates the immunogenicity of these cells. Interestingly, treatment with tumor necrosis factor (TNF)-related apoptosis inducing ligand (TRAIL) also induces membrane calreticulin exposure on cancer cells. As shown here, calreticulin directly interacts with TRAIL and its receptor-signaling complex, as well as with other TNF family members. Of note, TRAIL is a well known immunomodulatory molecule, and is expressed on the surface of natural killer T-cells. Therefore, calreticulin may have an as yet unrecognized wide(r) impact on immunity, with the TNF-ligand family modulating virtually all aspects of the immune response.Dutch Cancer SocietyNetherlands Organization for Scientific ResearchEuropean Communities Seventh Framework Programme (FP7/2007-2013

Acute cigarette smoke-induced eQTL affects formyl peptide receptor expression and lung function.

BACKGROUND AND OBJECTIVE:Cigarette smoking is one of the most prevalent causes of preventable deaths worldwide, leading to chronic diseases, including chronic obstructive pulmonary disease (COPD). Cigarette smoke is known to induce significant transcriptional modifications throughout the respiratory tract. However, it is largely unknown how genetic profiles influence the smoking-related transcriptional changes and how changes in gene expression translate into altered alveolar epithelial repair responses. METHODS:We performed a candidate-based acute cigarette smoke-induced eQTL study, investigating the association between SNP and differential gene expression of FPR family members in bronchial epithelial cells isolated 24 h after smoking and after 48 h without smoking. The effects FPR1 on lung epithelial integrity and repair upon damage in the presence and absence of cigarette smoke were studied in CRISPR-Cas9-generated lung epithelial knockout cells. RESULTS:One significant (FDR 2-fold change in gene expression. The minor allele of rs3212855 was associated with significantly higher gene expression of FPR1, FPR2 and FPR3 upon smoking. Importantly, the minor allele of rs3212855 was also associated with lower lung function. Alveolar epithelial FPR1 knockout cells were protected against CSE-induced reduction in repair capacity upon wounding. CONCLUSION:We identified a novel smoking-related inducible eQTL that is associated with a smoke-induced increase in the expression of FPR1, FPR2 and FPR3, and with lowered lung function. in vitro FPR1 down-regulation protects against smoke-induced reduction in lung epithelial repair

Optical switching by capillary condensation

Photonic materials, which have optical properties that can be modulated by light, are extremely interesting both for their fundamental properties as well as for their potential in the applications of all-optical signal processing and possibly optical computing. Earlier studies have been based on nonlinear photonic crystals, and have required relatively high local light intensities to be used. We propose a completely different strategy based on the interplay between light propagation and capillary condensation of gases in porous photonic structures. We show experimentally that the local light intensity can alter the gas/liquid phase equilibrium inside the pores, which allows the refractive-index distribution inside the material to be optically tuned. As a specific example, we show how this feature can be used to obtain optical bistability in porous superlattices. Our results provide a new approach for achieving optical control in photonic systems

Galectin-9 Activates and Expands Human T-Helper 1 Cells

<p>Galectin-9 (Gal-9) is known for induction of apoptosis in IFN-gamma and IL-17 producing T-cells and amelioration of autoimmunity in murine models. On the other hand, Gal-9 induced IFN-gamma positive T-cells in a sarcoma mouse model and in food allergy, suggesting that Gal-9 can have diametric effects on T-cell immunity. Here, we aimed to delineate the immunomodulatory effect of Gal-9 on human resting and ex vivo activated peripheral blood lymphocytes. Treatment of resting lymphocytes with low concentrations of Gal-9 (5-30 nM) induced apoptosis in similar to 60% of T-cells after 1 day, but activated the surviving T-cells. These viable T-cells started to expand after 4 days with up to 6 cell divisions by day 7 and an associated shift from naive towards central memory and IFN-gamma producing phenotype. In the presence of T-cell activation signals (anti-CD3/IL-2) Gal-9 did not induce T-cell expansion, but shifted the CD4/CD8 balance towards a CD4-dominated T-cell response. Thus, Gal-9 activates resting T-cells in the absence of typical T-cell activating signals and promotes their transition to a T-H1/C1 phenotype. In the presence of T-cell activating signals T-cell immunity is directed towards a CD4-driven response by Gal-9. Thus, Gal-9 may specifically enhance reactive immunological memory.</p>

Antisense mRNA for NPY-Y1 receptor in the medial preoptic area increases prolactin secretion

We investigated the participation of neuropeptide Y-Y1 receptors within the medial preoptic area in luteinizing hormone, follicle-stimulating hormone and prolactin release. Four bilateral microinjections of sense (control) or antisense 18-base oligonucleotides of messenger ribonucleic acid (mRNA) (250 ng) corresponding to the NH2-terminus of the neuropeptide Y1 receptor were performed at 12-h intervals for two days into the medial preoptic area of ovariectomized Wistar rats (N = 16), weighing 180 to 200 g, treated with estrogen (50 µg) and progesterone (25 mg) two days before the experiments between 8.00 and 10:00 a.m. Blockade of Y1 receptor synthesis in the medial preoptic area by the antisense mRNA did not change plasma luteinizing hormone or follicle-stimulating hormone but did increase prolactin from 19.6 ± 5.9 ng/ml in the sense group to 52.9 ± 9.6 ng/ml in the antisense group. The plasma hormones were measured by radioimmunoassay and the values are reported as mean ± SEM. These data suggest that endogenous neuropeptide Y in the medial preoptic area has an inhibitory action on prolactin secretion through Y1 receptors