scholarly journals Nfil3 Is a Glucocorticoid-Regulated Gene Required for Glucocorticoid-Induced Apoptosis in Male Murine T Cells

Endocrinology ◽  
2013 ◽  
Vol 154 (4) ◽  
pp. 1540-1552 ◽  
Author(s):  
Kirstyn T. Carey ◽  
Kheng H. Tan ◽  
Judy Ng ◽  
Douglas R. Liddicoat ◽  
Dale I. Godfrey ◽  
...  
Keyword(s):  
T Cells ◽  
Natural Killer ◽  
Killer Cell ◽  
Mrna Levels ◽  
Small Interfering Rnas ◽  
Double Positive ◽  
Double Labeling ◽  
Exon 2 ◽  
Protein Levels

Abstract Glucocorticoids (GCs) have essential roles in the regulation of development, integrated metabolism, and immune and neurological responses, and act primarily via the glucocorticoid receptor (GR). In most cells, GC treatment results in down-regulation of GR mRNA and protein levels via negative feedback mechanisms. However, in GC-treated thymocytes, GR protein levels are maintained at a high level, increasing sensitivity of thymocytes to GCs, resulting in apoptosis termed glucocorticoid-induced cell death (GICD). CD4+CD8+ double-positive thymocytes and thymic natural killer T cells in particular are highly sensitive to GICD. Although GICD is exploited via the use of synthetic GC analogues in the treatment of hematopoietic malignancies, the intracellular molecular pathway of GICD is not well understood. To explore GICD in thymocytes, the authors performed whole genome expression microarray analysis in mouse GR exon 2 null vs wild-type thymus RNA 3 hours after dexamethasone treatment. Identified and validated direct GR targets included P21 and Bim, in addition to an important transcriptional regulator Nfil3, which previously has been associated with GICD and is essential for natural killer cell development in vivo. Immunostaining of NFIL3 in whole thymus localized NFIL3 primarily to the medullary region, and double labeling colocalized NFIL3 to apoptotic cells. In silico analysis revealed a putative GC response element 5 kb upstream of the Nfil3 promoter that is strongly conserved in the rat genome and was confirmed to bind GR by chromatin immunoprecipitation. The knockdown of Nfil3 mRNA levels to 20% of normal using specific small interfering RNAs abrogated GICD, indicating that NFIL3 is required for normal GICD in CTLL-2 T cells.

scholarly journals Regulation of intestinal serotonin transporter expression via epigenetic mechanisms: role of HDAC2

2013 ◽  
Vol 304 (4) ◽  
pp. C334-C341 ◽  
Author(s):  
Ravinder K. Gill ◽  
Anoop Kumar ◽  
Pooja Malhotra ◽  
Daniel Maher ◽  
Varsha Singh ◽  
...  
Keyword(s):  
Hdac Inhibitors ◽  
In Vivo Model ◽  
Mrna Levels ◽  
Epigenetic Mechanisms ◽  
Hdac Inhibition ◽  
Exon 2 ◽  
Protein Levels ◽  
Histone Hyperacetylation

The serotonin (5-HT) transporter (SERT) facilitates clearance of extracellular 5-HT by its uptake and internalization. Decreased expression of SERT and consequent high 5-HT levels have been implicated in various diarrheal disorders. Thus, appropriate regulation of SERT is critical for maintenance of 5-HT homeostasis in health and disease. Previous studies demonstrated that SERT is regulated via posttranslational and transcriptional mechanisms. However, the role of epigenetic mechanisms in SERT regulation is not known. Current studies investigated the effects of histone deacetylase (HDAC) inhibition on SERT expression and delineated the mechanisms. Treatment of Caco-2 cells with the pan-HDAC inhibitors butyrate (5 mM) and trichostatin (TSA, 1 μM) decreased SERT mRNA and protein levels. Butyrate- or TSA-induced decrease in SERT was associated with decreased activity of human SERT (hSERT) promoter 1 (upstream of exon 1a), but not hSERT promoter 2 (upstream of exon 2). Butyrate + TSA did not show an additive effect on SERT expression, indicating that mechanisms involving histone hyperacetylation may be involved. Chromatin immunoprecipitation assays demonstrated enrichment of the hSERT promoter 1 (flanking nt −250/+2) with tetra-acetylated histone H3 or H4, which was increased (∼3-fold) by butyrate. Interestingly, specific inhibition of HDAC2 (but not HDAC1) utilizing small interfering RNA decreased SERT mRNA and protein levels. The decrease in SERT expression by HDAC inhibition was recapitulated in an in vivo model . SERT mRNA levels were decreased in the ileum and colon of mice fed pectin (increased availability of butyrate) compared with controls fed a fiber-free diet (∼50–60%). Our results identify a novel role of HDAC2 as a regulator of SERT gene expression in intestinal epithelial cells.

scholarly journals Coordinate Expression and Trans Presentation of Interleukin (IL)-15Rα and IL-15 Supports Natural Killer Cell and Memory CD8+ T Cell Homeostasis

2004 ◽  
Vol 200 (7) ◽  
pp. 825-834 ◽  
Author(s):  
Patrick R. Burkett ◽  
Rima Koka ◽  
Marcia Chien ◽  
Sophia Chai ◽  
David L. Boone ◽  
...  
Keyword(s):  
T Cells ◽  
Natural Killer ◽  
Cd8 T Cells ◽  
Killer Cell ◽  
Cellular Level ◽  
T Cell Homeostasis ◽  
Memory Cd8 T Cells ◽  
In Trans ◽  
Cd8 Memory T Cells

The high affinity interleukin (IL)-15 receptor, IL-15Rα, is essential for supporting lymphoid homeostasis. To assess whether IL-15Rα's role in vivo is to trans present IL-15, we generated mixed bone marrow chimera from IL-15Rα– and IL-2/15Rβ–deficient mice. We find that IL-15Rα–competent, IL-2/15Rβ–deficient cells are able to support IL-15Rα–deficient natural killer (NK) and memory CD8+ T cells, thus ruling out secondary signals on these cells and demonstrating that IL-15Rα–mediated presentation of IL-15 in trans is the primary mechanism by which IL-15Rα functions in vivo. Surprisingly, using IL-15– and IL-15Rα–deficient mixed chimera, we also find that IL-15 and IL-15Rα must be expressed by the same cells to present IL-15 in trans, indicating that IL-15Rα is required on a cellular level for the elaboration of IL-15. These studies indicate that IL-15Rα defines homeostatic niches for NK and memory CD8+ T cells by controlling both the production and the presentation of IL-15 in trans to NK and CD8+ memory T cells.

scholarly journals In Vivo Expression of Natural Killer Cell Inhibitory Receptors by Human Melanoma–Specific Cytolytic T Lymphocytes

1999 ◽  
Vol 190 (6) ◽  
pp. 775-782 ◽  
Author(s):  
Daniel E. Speiser ◽  
Mikaël J. Pittet ◽  
Danila Valmori ◽  
Rod Dunbar ◽  
Donata Rimoldi ◽  
...  
Keyword(s):  
T Cells ◽  
T Lymphocytes ◽  
Natural Killer ◽  
Killer Cell ◽  
Cytolytic T Lymphocytes ◽  
Nk Receptors ◽  
Melanoma Patients ◽  
Nk Receptor

Natural killer (NK) receptor signaling can lead to reduced cytotoxicity by NK cells and cytolytic T lymphocytes (CTLs) in vitro. Whether T cells are inhibited in vivo remains unknown, since peptide antigen–specific CD8+ T cells have so far not been found to express NK receptors in vivo. Here we demonstrate that melanoma patients may bear tumor-specific CTLs expressing NK receptors. The lysis of melanoma cells by patient-derived CTLs was inhibited by the NK receptor CD94/NKG2A. Thus, tumor-specific CTL activity may be decreased through NK receptor triggering in vivo.

scholarly journals Elimination In Vivo of Developing T Cells by Natural Killer Cells

2003 ◽  
Vol 198 (8) ◽  
pp. 1213-1224 ◽  
Author(s):  
Eckart Schott ◽  
Roberto Bonasio ◽  
Hidde L. Ploegh
Keyword(s):  
T Cells ◽  
Natural Killer Cells ◽  
Natural Killer Cell ◽  
Natural Killer ◽  
Killer Cell ◽  
Class I ◽  
Cell Toxicity ◽  
Class I Mhc ◽  
Killer Cells

Natural killer cells gauge the absence of self class I MHC on susceptible target cells by means of inhibitory receptors such as members of the Ly49 family. To initiate killing by natural killer cells, a lack of inhibitory signals must be accompanied by the presence of activating ligands on the target cell. Although natural killer cell–mediated rejection of class I MHC–deficient bone marrow (BM) grafts is a matter of record, little is known about the targeting in vivo of specific cellular subsets by natural killer cells. We show here that development of class I MHC–negative thymocytes is delayed as a result of natural killer cell toxicity after grafting of a class I MHC–positive host with class I MHC–negative BM. Double positive thymocytes that persist in the presence of natural killer cells display an unusual T cell receptor–deficient phenotype, yet nevertheless give rise to single positive thymocytes and yield mature class I MHC–deficient lymphocytes that accumulate in the class I MHC–positive host. The resulting class I MHC–deficient CD8 T cells are functional and upon activation remain susceptible to natural killer cell toxicity in vivo. Reconstitution of class I MHC–deficient BM precursors with H2-Kb by retroviral transduction fully restores normal thymic development.

scholarly journals TRIM27 interacts with Iκbα to promote the growth of human renal cancer cells through regulating the NF-κB pathway

BMC Cancer ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Chengwu Xiao ◽  
Wei Zhang ◽  
Meimian Hua ◽  
Huan Chen ◽  
Bin Yang ◽  
...  
Keyword(s):  
Cell Lines ◽  
Prognostic Indicator ◽  
The Cancer Genome Atlas ◽  
Mrna Levels ◽  
Loss Of Function ◽  
Protein Levels ◽  
Kaplan Meier ◽  
Cancer Genome Atlas

Abstract Background The tripartite motif (TRIM) family proteins exhibit oncogenic roles in various cancers. The roles of TRIM27, a member of the TRIM super family, in renal cell carcinoma (RCC) remained unexplored. In the current study, we aimed to investigate the clinical impact and roles of TRIM27 in the development of RCC. Methods The mRNA levels of TRIM27 and Kaplan–Meier survival of RCC were analyzed from The Cancer Genome Atlas database. Real-time PCR and Western blotting were used to measure the mRNA and protein levels of TRIM27 both in vivo and in vitro. siRNA and TRIM27 were exogenously overexpressed in RCC cell lines to manipulate TRIM27 expression. Results We discovered that TRIM27 was elevated in RCC patients, and the expression of TRIM27 was closely correlated with poor prognosis. The loss of function and gain of function results illustrated that TRIM27 promotes cell proliferation and inhibits apoptosis in RCC cell lines. Furthermore, TRIM27 expression was positively associated with NF-κB expression in patients with RCC. Blocking the activity of NF-κB attenuated the TRIM27-mediated enhancement of proliferation and inhibition of apoptosis. TRIM27 directly interacted with Iκbα, an inhibitor of NF-κB, to promote its ubiquitination, and the inhibitory effects of TRIM27 on Iκbα led to NF-κB activation. Conclusions Our results suggest that TRIM27 exhibits an oncogenic role in RCC by regulating NF-κB signaling. TRIM27 serves as a specific prognostic indicator for RCC, and strategies targeting the suppression of TRIM27 function may shed light on future therapeutic approaches.

scholarly journals DBC1 (Deleted in Breast Cancer 1) modulates the stability and function of the nuclear receptor Rev-erbα

2013 ◽  
Vol 451 (3) ◽  
pp. 453-461 ◽  
Author(s):  
Claudia C. S. Chini ◽  
Carlos Escande ◽  
Veronica Nin ◽  
Eduardo N. Chini
Keyword(s):  
Breast Cancer ◽  
Nuclear Receptor ◽  
Clock Genes ◽  
Mrna Levels ◽  
Protein Levels ◽  
The Stability ◽  
And Function ◽  
Interfering Rna ◽  
In Cells

The nuclear receptor Rev-erbα has been implicated as a major regulator of the circadian clock and integrates circadian rhythm and metabolism. Rev-erbα controls circadian oscillations of several clock genes and Rev-erbα protein degradation is important for maintenance of the circadian oscillations and also for adipocyte differentiation. Elucidating the mechanisms that regulate Rev-erbα stability is essential for our understanding of these processes. In the present paper, we report that the protein DBC1 (Deleted in Breast Cancer 1) is a novel regulator of Rev-erbα. Rev-erbα and DBC1 interact in cells and in vivo, and DBC1 modulates the Rev-erbα repressor function. Depletion of DBC1 by siRNA (small interfering RNA) in cells or in DBC1-KO (knockout) mice produced a marked decrease in Rev-erbα protein levels, but not in mRNA levels. In contrast, DBC1 overexpression significantly enhanced Rev-erbα protein stability by preventing its ubiquitination and degradation. The regulation of Rev-erbα protein levels and function by DBC1 depends on both the N-terminal and C-terminal domains of DBC1. More importantly, in cells depleted of DBC1, there was a dramatic decrease in circadian oscillations of both Rev-erbα and BMAL1. In summary, our data identify DBC1 as an important regulator of the circadian receptor Rev-erbα and proposes that Rev-erbα could be involved in mediating some of the physiological effects of DBC1.

scholarly journals A cloned cell line mediating natural killer cell function inhibits immunoglobulin secretion.

1982 ◽  
Vol 156 (2) ◽  
pp. 658-663 ◽  
Author(s):  
G Nabel ◽  
W J Allard ◽  
H Cantor
Keyword(s):  
Nk Cells ◽  
Natural Killer ◽  
Cell Line ◽  
B Lymphocytes ◽  
Cell Function ◽  
Killer Cell ◽  
Major Histocompatibility Complex Gene ◽  
Cell Surface Antigens

We previously described a cloned cell line that combines information for a unique display of cell surface antigens and specialized function similar to activated natural killer (NK) cells. In addition to conventional cellular targets such as the YAC-1 and MBL-2 lymphomas, this cloned line also lysed lipopolysaccharide-activated B lymphocytes. To determine whether some NK cells can inhibit B cell function, we tested the ability of NK-like clones to suppress Ig secretion in vitro and in vivo. These cloned cells suppressed Ig secretion when they constituted as few as 0.2% of the total cell population and inhibition did not require identity at the H-2 locus. We suggest that some NK cells might recognize non-major histocompatibility complex gene products on activated B lymphocytes and lyse these cells, and this might represent a fundamental cell-cell interaction that regulates antibody secretion by activated B cells.

In vivo enhancement of natural killer cell activity through tea fortified with Ayurvedic herbs

2009 ◽  
Vol 24 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Jyoti Bhat ◽  
Aparna Damle ◽  
Pankaj P Vaishnav ◽  
Ruud Albers ◽  
Manoj Joshi ◽  
...  
Keyword(s):  
Natural Killer Cell ◽  
Natural Killer ◽  
Natural Killer Cell Activity ◽  
Killer Cell ◽  
Cell Activity ◽  
Killer Cell Activity
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