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T-Cell apoptosis

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https://www.readbyqxmd.com/read/27936393/suppression-of-protein-tyrosine-phosphatase-ptpn22-gene-induces-apoptosis-in-t-cell-leukemia-cell-line-jurkat-through-the-akt-and-erk-pathways
#1
Elham Baghbani, Behzad Baradaran, Fatemeh Pak, Leila Mohammadnejad, Daryoush Shanehbandi, Behzad Mansoori, Vahid Khaze, Noushin Montazami, Ali Mohammadi, Parviz Kokhaei
The aim of this study was to investigate the effect of specific PTPN22 small interfering RNAs (siRNAs) on the viability and induction of apoptosis in Jurkat cells and to evaluate apoptosis signaling pathways. In this study, Jurkat cells were transfected with specific PTPN22 siRNA. Relative PTPN22 mRNA expression was measured by Quantitative Real-time PCR. Western blotting was performed to determine the protein levels of PTPN22, AKT, P-AKT, ERK, and P-ERK. The cytotoxic effects of PTPN22 siRNA were determined using the MTT assay...
December 6, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27936218/a-key-role-for-inhibins-in-dendritic-cell-maturation-and-function
#2
Roxana Olguín-Alor, Marisol de la Fuente-Granada, Laura C Bonifaz, Laura Antonio-Herrera, Eduardo A García-Zepeda, Gloria Soldevila
Inhibins are members of the TGFβ superfamily, which regulate many cellular processes including differentiation, proliferation, survival and apoptosis. Although initially described as hormones regulating the hypothalamus-pituitary-gonadal axis, based on their ability to antagonize Activins, our group has recently reported that they play a role in thymocyte differentiation and survival, as well as in thymic stromal cell maturation and nTreg generation. Here, we used Inhibin knock out mice (Inhα-/-) to investigate the role of Inhibins in peripheral dendritic cell maturation and function...
2016: PloS One
https://www.readbyqxmd.com/read/27936095/dual-specificity-phosphatase-5-is-essential-for-t-cell-survival
#3
Raman G Kutty, Gang Xin, David M Schauder, Stephanie M Cossette, Michelle Bordas, Weiguo Cui, Ramani Ramchandran
The mitogen-activated protein kinase (MAPK) pathway regulates many key cellular processes such as differentiation, apoptosis, and survival. The final proteins in this pathway, ERK1/2, are regulated by dual specificity phosphatase 5 (DUSP5). DUSP5 is a nuclear, inducible phosphatase with high affinity and fidelity for ERK1/2. By regulating the final step in the MAPK signaling cascade, DUSP5 exerts strong regulatory control over a central cellular pathway. Like other DUSPs, DUSP5 plays an important role in immune function...
2016: PloS One
https://www.readbyqxmd.com/read/27935477/regulation-of-b-cell-fate-by-chronic-activity-of-the-ige-b-cell-receptor
#4
Zhiyong Yang, Marcus J Robinson, Xiangjun Chen, Geoffrey Alexander Smith, Jack Taunton, Wanli Liu, Christopher Dc Allen
IgE can trigger potent allergic responses, yet the mechanisms regulating IgE production are poorly understood. Here we reveal that IgE(+) B cells are constrained by chronic activity of the IgE B cell receptor (BCR). In the absence of cognate antigen, the IgE BCR promoted terminal differentiation of B cells into plasma cells (PCs) under cell culture conditions mimicking T cell help. This antigen-independent PC differentiation involved multiple IgE domains and Syk, CD19, BLNK, Btk, and IRF4. Disruption of BCR signaling in mice led to consistently exaggerated IgE(+) germinal center (GC) B cell but variably increased PC responses...
December 9, 2016: ELife
https://www.readbyqxmd.com/read/27935327/activation-induced-cell-death-aicd-of-human-melanoma-antigen-specific-tcr-engineered-cd8-t-cells-involves-jnk-bim-and-p53
#5
Arvind Chhabra, Bijay Mukherji, Deepika Batra
OBJECTIVES: Adoptive cancer immunotherapy (ACT) with transgenic T cell receptor (TCR) engineered (TCReng) anti-tumor T cells has produced encouraging results, however, efficacy of these approaches need improvement. Since premature activation induced cell death (AICD) of adoptively administered T cells could be a major impediment, we examined the mechanism(s) underlying AICD in TCReng CD8+ cytolytic T lymphocytes (CTL). METHODS: AICD in human tumor antigen specific MHC class I restricted TCR engineered CD8+ CTL was induced by exposing them to cognate peptide epitope...
December 9, 2016: Expert Opinion on Therapeutic Targets
https://www.readbyqxmd.com/read/27932994/comparative-mrna-and-microrna-profiling-during-acute-myocardial-infarction-induced-by-coronary-occlusion-and-ablation-radio-frequency-currents
#6
Eduardo T Santana, Regiane Dos Santos Feliciano, Andrey J Serra, Eduardo Brigidio, Ednei L Antonio, Paulo J F Tucci, Lubov Nathanson, Mariana Morris, José A Silva
The ligation of the left anterior descending coronary artery is the most commonly used experimental model to induce myocardial infarction (MI) in rodents. A high mortality in the acute phase and the heterogeneity of the size of the MI obtained are drawbacks recognized in this model. In an attempt to solve the problem, our group recently developed a new MI experimental model which is based on application of myocardial ablation radio-frequency currents (AB-RF) that yielded MI with homogeneous sizes and significantly reduce acute mortality...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27932123/serum-levels-of-interleukin-34-during-acute-rejection-in-liver-transplantation
#7
D San Segundo, P Ruiz, J Irure, M T Arias-Loste, A Cuadrado, A Puente, F Casafont, M López-Hoyos, J Crespo, E Fábrega
INTRODUCTION: Accumulating evidence indicates that interleukin (IL)-34 participates in T-cell homeostasis and tolerance due to the ability of IL-34 to trigger apoptosis of Th1, Th17, and Tc1 cells, but spare Th2 cells and Treg. In addition, IL-34 exerts anti-inflammatory effects by impairing leukocyte adhesion and transendothelial migration, and reducing the secretion of proinflammatory cytokines. The aim of our study was to investigate the time course of serum levels of IL-34 during hepatic allograft rejection...
November 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27931684/inhibition-of-apoptosis-by-rv2456c-through-nuclear-factor-%C3%AE%C2%BAb-extends-the-survival-of-mycobacterium-tuberculosis
#8
Kristen L Jurcic Smith, Sunhee Lee
Mycobacterium tuberculosis, the causative agent of tuberculosis, is an intracellular pathogen with several survival mechanisms aimed at subverting the host immune system. Apoptosis has been shown to be mycobactericidal, to activate CD8(+) T cells, and to be modulated by mycobacterial proteins. Since few mycobacterial proteins have so far been directly implicated in the interactions between M. tuberculosis and host cell apoptosis, we screened M. tuberculosis H37Rv transposon mutants to identify mutants that fail to inhibit cell death (FID)...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/27930745/the-ebola-interferon-inhibiting-domains-attenuate-and-dysregulate-cell-mediated-immune-responses
#9
Ndongala Michel Lubaki, Patrick Younan, Rodrigo I Santos, Michelle Meyer, Mathieu Iampietro, Richard A Koup, Alexander Bukreyev
Ebola virus (EBOV) infections are characterized by deficient T-lymphocyte responses, T-lymphocyte apoptosis and lymphopenia. We previously showed that disabling of interferon-inhibiting domains (IIDs) in the VP24 and VP35 proteins effectively unblocks maturation of dendritic cells (DCs) and increases the secretion of cytokines and chemokines. Here, we investigated the role of IIDs in adaptive and innate cell-mediated responses using recombinant viruses carrying point mutations, which disabled IIDs in VP24 (EBOV/VP24m), VP35 (EBOV/VP35m) or both (EBOV/VP35m/VP24m)...
December 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27930382/ym155-induces-apoptosis-in-p53-deficient-t-acute-lymphoblastic-leukemia-cells-independent-of-survivin-inhibition
#10
Leilane Sales, Graziella R de Sousa, Guilherme Á Ferreira-Silva, Angel M Castro-Gamero, Marisa Ionta, Jaqueline C de Oliveira
T-acute lymphoblastic leukemia (T-ALL) is an aggressive hematological cancer that arises from the malignant transformation of T-cell progenitors. Despite the significant progress in current treatment, challenges remain the lifelong morbidity after current chemotherapy regimens and postrelapse survival. In addition, patients with T-ALL have inferior outcomes compared with those with B-cell precursor; consequently, novel therapeutic approaches are still necessary to improve the outcome in this cohort. YM155 is an imidazolium derivative originally discovered as a suppressant of survivin expression...
December 7, 2016: Anti-cancer Drugs
https://www.readbyqxmd.com/read/27929746/exogenous-expression-of-samhd1-inhibits-proliferation-and-induces-apoptosis-in-cutaneous-t-cell-lymphoma-derived-hut78-cells
#11
Karthik M Kodigepalli, Minghua Li, Shan-Lu Liu, Li Wu
Sterile alpha motif and HD domain-containing protein 1 (SAMHD1) is a mammalian dNTP hydrolase (dNTPase) that regulates intracellular dNTP balance. We have previously reported that SAMHD1 mRNA and protein levels are significantly downregulated in CD4(+) T-cells of patients with cutaneous T-cell lymphoma (CTCL), a disease characterized by infiltration of neoplastic CD4(+) T-lymphocytes into the skin. However, functional significance of SAMHD1 in CTCL development and progression remains unknown. Here we investigate the mechanism by which SAMHD1 induces apoptosis in CTCL-derived CD4(+) T-cells...
December 8, 2016: Cell Cycle
https://www.readbyqxmd.com/read/27927647/gvhd-prevents-nk-cell-dependent-leukemia-and-virus-specific-innate-immunity
#12
Mark D Bunting, Antiopi Varelias, Fernando Souza-Fonseca-Guimaraes, Iona S Schuster, Katie E Lineburg, Rachel D Kuns, Peter Fleming, Kelly R Locke, Nicholas D Huntington, Bruce R Blazar, Steven W Lane, Siok-Keen Tey, Kelli P A MacDonald, Mark J Smyth, Mariapia A Degli-Esposti, Geoffrey R Hill
Allogeneic bone marrow transplantation (allo-BMT) is a curative therapy for hematological malignancies, but is associated with significant complications, principally graft-versus-host disease (GVHD) and opportunistic infections. Natural killer (NK) cells mediate important innate immunity that provides a temporal bridge until the reconstruction of adaptive immunity. Here we show that the development of GVHD after allo-BMT prevented NK-cell reconstitution, particularly within the maturing M1 and M2 NK-cell subsets in association with exaggerated activation, apoptosis and autophagy...
December 7, 2016: Blood
https://www.readbyqxmd.com/read/27927199/sh003-induces-apoptosis-of-du145-prostate-cancer-cells-by-inhibiting-erk-involved-pathway
#13
Yu-Jeong Choi, Youn Kyung Choi, Kang Min Lee, Sung-Gook Cho, Soo-Yeon Kang, Seong-Gyu Ko
BACKGROUND: Herbal medicines have been used in cancer treatment, with many exhibiting favorable side effect and toxicity profiles compared with conventional chemotherapeutic agents. SH003 is a novel extract from Astragalus membranaceus, Angelica gigas, and Trichosanthes Kirilowii Maximowicz combined at a 1:1:1 ratio that impairs the growth of breast cancer cells. This study investigates anti-cancer effects of SH003 in prostate cancer cells. METHODS: SH003 extract in 30% ethanol was used to treat the prostate cancer cell lines DU145, LNCaP, and PC-3...
December 7, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27925004/appropriate-osmotic-balance-duration-for-different-volumes-of-ovarian-tissue-in-vitrification-solution-a-study-of-ovary-tissue-vitrification-and-transplantation-in-sheep
#14
L Dang, X Zheng, Q Chang, Y Yang, Y Wang, Y Cai, C Hei, H Wang, C Zhao, W Zhu, Y Wang
:   BACKGROUND: Auto-transplantation of cryopreserved ovarian tissue has become a promising method for fertility preservation and standardization of the process is crucial for practical applications. OBJECTIVE: Here we used different size of large sheep ovarian cortex to study the most suitable osmotic balance durations in the vitrification solution for large piece ovary cortex. MATERIALS AND METHODS: The ovarian cortices from six-month old female sheep were divided into 40 cubic mm, 80 cubic mm and 160 cubic mm volume, A two-step osmotic balance method was used based on the results from morphological and histological study, we detected the expression of VEGF after thawing, the percentage of follicles that survived and serum E2 levels,together with apoptosis test by TUNEL...
September 2016: Cryo Letters
https://www.readbyqxmd.com/read/27924972/protective-mechanisms-of-purified-polyphenols-from-pinecones-of-pinus-koraiensis-on-spleen-tissues-in-tumor-bearing-s180-mice-in-vivo
#15
Juanjuan Yi, Cuilin Cheng, Xiaoyu Li, Haitian Zhao, Hang Qu, Zhenyu Wang, Lu Wang
The previous study evaluated the antitumor activity and the underlying mechanism of the purified polyphenols from pinecones of Pinus koraiensis (PPP-40) using a tumor-bearing S180 mice model. This study was designed to evaluate the protective effects of PPP-40 on spleen tissues of S180 mice in vivo. Pretreatment with PPP-40 (150 mg per kg BW per D) could significantly inhibit tumor growth, enhance spleen index and prevent the decline of haematological parameters of S180 mice induced by the tumor microenvironment...
December 7, 2016: Food & Function
https://www.readbyqxmd.com/read/27924725/anticancer-drug-targets-of-salvia-phytometabolites-chemistry-biology-and-omics
#16
Da-Cheng Hao, Guang-Bo Ge, Pei-Gen Xiao
Salvia displays diverse anticancer properties, which are attributable to their diterpene and phenolic contents. There is no comprehensive review on the anticancer diversity and molecular targets of Salvia components. We investigate the diversity and molecular targets of Salvia phytometabolites responsible for the prevention and treatment of cancer and sarcoma. Traditional therapeutic knowledge suggests that Salvia species can be used to develop anticancer drugs. Lots of concerns have been raised for tanshinone (Tan) IIA and cryptotanshinone...
December 7, 2016: Current Drug Targets
https://www.readbyqxmd.com/read/27923905/%C3%AE-lapachone-inhibits-lung-metastasis-of-colorectal-cancer-by-inducing-apoptosis-of-ct26-cells
#17
Ji-Ye Kee, Yo-Han Han, Jinbong Park, Dae-Seung Kim, Jeong-Geon Mun, Kwang Seok Ahn, Hyun-Jung Kim, Jae-Young Um, Seung-Heon Hong
BACKGROUND: β-Lapachone is a quinone-containing compound found in red lapacho (Tabebuia impetiginosa, syn. T avellanedae) trees. Lapacho has been used in traditional medicine by several South and Central American indigenous people to treat various types of cancer. The purpose of this study was to investigate the antimetastatic properties of β-lapachone and the underlying mechanisms using colon cancer cells. METHODS: This research used metastatic murine colon cancer cell lines, colon 26 (CT26) and colon 38 (MC38)...
December 5, 2016: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/27922552/novel-use-of-all-trans-retinoic-acid-in-a-model-of-lipopolysaccharide-immunosuppression-to-decrease-the-generation-of-myeloid-derived-suppressor-cells-by-reducing-the-proliferation-of-cd34-precursor-cells
#18
Daiana Martire-Greco, Nahuel Rodriguez-Rodrigues, Luis A Castillo, María Belén Vecchione, Marcelo de Campos-Nebel, Marlina Córdoba Moreno, Roberto Meiss, Mónica Vermeulen, Veronica I Landoni, Gabriela C Fernandez
All-trans-Retinoic Acid (ATRA) is a derivative of vitamin A with anti-proliferative properties. Endotoxin shock and subsequent immunosuppression (IS) by lipopolysaccharide (LPS) stimulates myelopoiesis with expansion of myeloid-derived suppressor cells (MDSC). Since we have previously shown that ATRA reverses the IS state by decreasing functional MDSC, our aim was to investigate if ATRA was able to modulate MDSC generation by regulating myelopoiesis in murine hematopoietic organs. We found that ATRA administration in vivo and in vitro decreased the number of CD34+ precursor cells that were increased in IS mice...
November 25, 2016: Shock
https://www.readbyqxmd.com/read/27921413/short-time-efficiency-of-rhinophototherapy-in-management-of-patients-with-allergic-rhinitis-resistant-to-medical-therapy
#19
Soheila Alyasin, Seyed Hesamedin Nabavizadeh, Hamidreza Houshmand, Hossein Esmaeilzadeh, Sina Jelodar, Reza Amin
Allergic rhinitis is one of the most common health problems with a major effect on the quality of life. We intended to treat Allergic Rhinitis (AR) in patients who are either unresponsive to antihistamines or their job requires optimal alertness that may be disturbed by antihistamine's side effects and those who do not comply with the regular use. We tried short term phototherapy and evaluated its effect on AR. As phototherapy is effective in the treatment of atopic dermatitis (AD) and the same allergens can produce both AD and AR, phototherapy is proposed as a new tool in the AR treatment...
August 2016: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/27920565/electrochemotherapy-induces-apoptotic-death-in-melanoma-metastases-a-histologic-and-immunohistochemical-investigation
#20
Laura Bigi, Giovanna Galdo, Anna Maria Cesinaro, Cristina Vaschieri, Alessandra Marconi, Carlo Pincelli, Fabrizio Fantini
BACKGROUND: Electrochemotherapy (ECT) is increasingly used in the treatment of primary and secondary skin tumors, but little is known about the pathologic mechanism responsible for tumor cell destruction in humans. Knowledge of detailed mechanism of host response after ECT may improve the treatment efficacy related to patient selection and technique refinements. AIM: The aim of the study was to investigate the histopathology and mechanism of cell death after ECT in cutaneous melanoma metastases...
2016: Clinical, Cosmetic and Investigational Dermatology
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