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Microenvironment lymphoma

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https://www.readbyqxmd.com/read/28637496/mir21-sensitized-b-lymphoma-cells-to-abt-199-via-icos-icosl-mediated-interaction-of-treg-cells-with-endothelial-cells
#1
Zhong Zheng, Peng-Peng Xu, Li Wang, Hui-Jin Zhao, Xiang-Qin Weng, Hui-Juan Zhong, Bin Qu, Jie Xiong, Yan Zhao, Xue-Feng Wang, Anne Janin, Wei-Li Zhao
BACKGROUND: MicroRNAs (miRs) are involved in tumor progression by regulating tumor cells and tumor microenvironment. MiR21 is overexpressed in diffuse large B-cell lymphoma (DLBCL) and its biological impact on tumor microenvironment remains unclear. METHODS: MiR21 was assessed by quantitative RT-PCR in patients with newly diagnosed DLBCL. The mechanism of action of miR21 on lymphoma progression and tumor angiogenesis was examined in vitro in B-lymphoma cell lines and in vivo in a murine xenograft model...
June 21, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28627637/lentiviral-vector-mediated-co-overexpression-of-vegf-and-bcl-2-improves-mesenchymal-stem-cell-survival-and-enhances-paracrine-effects-in%C3%A2-vitro
#2
Xiaobin Ni, Caiwen Ou, Jingbin Guo, Bei Liu, Jianwu Zhang, Zhiye Wu, Hekai Li, Minsheng Chen
Mesenchymal stem cell (MSC) transplantation has emerged as a promising therapy for ischemic heart disease; however, the low survival rate of transplanted cells limits their therapeutic efficacy. The aim of this study was to investigate whether the dual genetic modification of vascular endothelial growth factor (VEGF) and B‑cell lymphoma‑2 (Bcl‑2) confers a higher expression level of the target genes, better survival and a stronger paracrine effect in MSCs in an adverse environment than the modification of the individual genes...
June 12, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28626618/cytoplasmic-expression-of-c-myc-protein-is-associated-with-risk-stratification-of-mantle-cell-lymphoma
#3
Yi Gong, Xi Zhang, Rui Chen, Yan Wei, Zhongmin Zou, Xinghua Chen
AIM: To investigate the association of C-MYC protein expression and risk stratification in mantle cell lymphoma (MCL), and to evaluate the utility of C-MYC protein as a prognostic biomarker in clinical practice. METHODS: We conducted immunohistochemical staining of C-MYC, Programmed cell death ligand 1 (PD-L1), CD8, Ki-67, p53 and SRY (sex determining region Y) -11 (SOX11) to investigate their expression in 64 patients with MCL. The staining results and other clinical data were evaluated for their roles in risk stratification of MCL cases using ANOVA, Chi-square, and Spearman's Rank correlation coefficient analysis...
2017: PeerJ
https://www.readbyqxmd.com/read/28624051/persistent-injury-associated-anemia-the-role-of-the-bone-marrow-microenvironment
#4
Jessica K Millar, Kolenkode B Kannan, Tyler J Loftus, Ines G Alamo, Jessica Plazas, Philip A Efron, Alicia M Mohr
BACKGROUND: The regulation of erythropoiesis involves hematopoietic progenitor cells, bone marrow stroma, and the microenvironment. Following severe injury, a hypercatecholamine state develops that is associated with increased mobilization of hematopoietic progenitor cells to peripheral blood and decreased growth of bone marrow erythroid progenitor cells that manifests clinically as a persistent injury-associated anemia. Changes within the bone marrow microenvironment influence the development of erythroid progenitor cells...
June 15, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28619982/jak1-2-and-bcl2-inhibitors-synergize-to-counteract-bone-marrow-stromal-cell-induced-protection-of-aml
#5
Riikka Karjalainen, Tea Pemovska, Mihaela Popa, Minxia Liu, Komal K Javarappa, Muntasir M Majumder, Bhagwan Yadav, David Tamborero, Jing Tang, Dmitrii Bychkov, Mika Kontro, Alun Parsons, Minna Suvela, Mireia Mayoral Safont, Kimmo Porkka, Tero Aittokallio, Olli Kallioniemi, Emmet McCormack, Bjørn T Gjertsen, Krister Wennerberg, Jonathan Knowles, Caroline A Heckman
The bone marrow (BM) provides a protective microenvironment to support the survival of leukemic cells and influence their response to therapeutic agents. In acute myeloid leukemia (AML), the high rate of relapse may in part be due to the inability of current treatment to effectively overcome the protective influence of the BM niche. To better understand the impact of the BM microenvironment on drug responses in AML, we conducted a comprehensive evaluation of 304 inhibitors, including approved and investigational agents, comparing ex vivo responses of primary AML cells in BM stroma-derived and standard culture conditions...
June 15, 2017: Blood
https://www.readbyqxmd.com/read/28618932/intimate-cross-talk-between-cancer-cells-and-the-tumor-microenvironment-of-b-cell-lymphomas-the-key-role-of-exosomes
#6
REVIEW
Biyu Xu, Ting Wang
B-cell lymphomas are composed of tumor cells and the tumor microenvironment, which is conventionally thought to be composed of a mixture of stromal cells, blood vessels, immune cells, and non-cell components, such as extracellular matrix, cytokines, and chemokines. Exosomes, small endocytically derived vesicles that have been proved to be present in a variety of tumor niches and involved in mediating cell signaling networks, are increasingly regarded as important components of tumor microenvironment. In this review, we first focus on the biogenesis, biodistribution, transportation, and other general characteristics of exosomes and then highlight the vital roles of exosomes in lymphomagenesis and disease progression, particularly from the perspective of immune dysfunction, virus infection, and therapeutic resistance mechanisms...
June 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28608950/assessment-of-programmed-death-ligand-1-expression-and-tumor-associated-immune-cells-in-pediatric-cancer-tissues
#7
Robbie G Majzner, Jason S Simon, Joseph F Grosso, Daniel Martinez, Bruce R Pawel, Mariarita Santi, Melinda S Merchant, Birgit Geoerger, Imene Hezam, Virginie Marty, Phillippe Vielh, Mads Daugaard, Poul H Sorensen, Crystal L Mackall, John M Maris
BACKGROUND: Programmed death 1 (PD-1) signaling in the tumor microenvironment dampens immune responses to cancer, and blocking this axis induces antitumor effects in several malignancies. Clinical studies of PD-1 blockade are only now being initiated in pediatric patients, and little is known regarding programmed death-ligand 1 (PD-L1) expression in common childhood cancers. The authors characterized PD-L1 expression and tumor-associated immune cells (TAICs) (lymphocytes and macrophages) in common pediatric cancers...
June 13, 2017: Cancer
https://www.readbyqxmd.com/read/28607806/significance-of-stromal-1-and-stromal-2-signatures-and-biologic-prognostic-model-in-diffuse-large-b-cell-lymphoma
#8
Asmaa Gaber Abdou, Nancy Asaad, Mona Kandil, Mohammed Shabaan, Asmaa Shams
OBJECTIVE: : Diffuse Large B Cell Lymphoma (DLBCL) is a heterogeneous group of tumors with different biological and clinical characteristics that have diverse clinical outcomes and response to therapy. Stromal-1 signature of tumor microenvironment of DLBCL represents extracellular matrix deposition and histiocytic infiltrate, whereas stromal-2 represents angiogenesis that could affect tumor progression. METHODS: : The aim of the present study is to assess the significance of stromal-1 signature using SPARC-1 and stromal-2 signature using CD31 expression and then finally to construct biologic prognostic model (BPM) in 60 cases of DLBCL via immunohistochemistry...
May 2017: Cancer Biology & Medicine
https://www.readbyqxmd.com/read/28606732/constitutive-and-acquired-mechanisms-of-resistance-to-immune-checkpoint-blockade-in-human-cancer
#9
Matteo Bellone, Angela Rita Elia
Cancer immunotherapy with monoclonal antibodies directed against regulatory pathways in T lymphocytes has been revolutionizing medical oncology, and the clinical success of monoclonal antibodies targeting either cytotoxic T lymphocyte antigen-4 (CTLA-4) or program death-1 (PD-1) in patients affected by melanoma, Hodgkin's lymphoma, Merkel cell carcinoma, and head and neck, bladder, renal cell or non-small cell lung cancer is way beyond the most optimistic expectation. However, immune checkpoint blockade (ICB) has failed to arrest progression in a consistent amount of patients affected by those tumors, and various histological types, including breast, colon and prostate cancer, are less sensitive to this therapeutic approach...
June 2, 2017: Cytokine & Growth Factor Reviews
https://www.readbyqxmd.com/read/28594662/patient-derived-tumor-xenografts-of-lymphoproliferative-disorders-are-they-surrogates-for-the-human-disease
#10
Marco Pizzi, Giorgio Inghirami
PURPOSE OF REVIEW: Patient-derived tumor xenografts (PDTXs) have emerged as powerful platforms in medical oncology. A plethora of PDTXs were generated to study solid cancers, but limited data are as yet available on hematological diseases. The aim of this review is to describe the state of art of lymphoma PDTXs, discussing future directions for the development of integrated/personalized cancer programs. RECENT FINDINGS: In the last decades, several PDTXs of lymphoproliferative disorders have been produced...
July 2017: Current Opinion in Hematology
https://www.readbyqxmd.com/read/28592537/role-of-autophagy-in-the-hiv-1-matrix-protein-p17-driven-lymphangiogenesis
#11
Pietro Mazzuca, Stefania Marsico, Kai Schulze, Stefania Mitola, Marina C Pils, Cinzia Giagulli, Carlos A Guzman, Arnaldo Caruso, Francesca Caccuri
AIDS-related lymphomas (ARLs) are expected to increase in the future since combined antiretroviral therapy (cART) enhances the life expectancy of HIV-1-infected (HIV(+)) patients, but does not affect the occurrence of ARLs to the same extent as of other tumors. Lymphangiogenesis is essential in supporting growth and metastatic spreading of ARLs. HIV-1 does not infect the neoplastic B cells, but HIV-1 proteins have been hypothesized to play a key role in sustaining a pro-lymphangiogenic microenvironment in lymphoid organs...
June 7, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28592433/bifurcated-bach2-control-coordinates-mantle-cell-lymphoma-survival-and-dispersal-during-hypoxia
#12
Han Zhang, Zheng Chen, Roberto N Miranda, L Jeffrey Medeiros, Nami McCarty
BACH2, a B cell-specific transcription factor, plays a critical role in oxidative stress-mediated drug resistance in mantle cell lymphoma (MCL); however, the biological functions of BACH2 and its regulation of B cell malignancies in chronic hypoxic microenvironment are never studied. Here, we found that silencing BACH2 led to not only increased tumor formation and colony formation but also increased tumor dispersal to spleen and bone marrow. Decreased BACH2 levels in the patients were also correlated to the bone marrow and gastrointestinal dispersal of MCL and blastoid subtypes of MCL...
June 7, 2017: Blood
https://www.readbyqxmd.com/read/28585612/-recent-advances-of-immunooncology-in-the-treatment-of-solid-tumours-and-haematological-malignancies-the-immune-checkpoint-inhibitors
#13
Viktória Fésüs
Cancer immunotherapy is coming of age, as outstanding results can be achieved in the therapy of cancer with poor prognosis by altering the patients' immune system and by promoting the immune response against tumours. Amongst immunotherapies, the immune checkpoint inhibitors (ICI) proved to be the most effective, primarily in the treatment of solid tumours, including melanoma, non-small cell lung carcinoma, and classical Hodgkin's lymphoma. The reason for this efficacy is the immunosuppressive microenvironment typical for many cancer types, directly and indirectly inhibiting effector T-cell responses...
June 6, 2017: Magyar Onkologia
https://www.readbyqxmd.com/read/28580305/expression-of-hsa-mir-204-runx2-ppar%C3%AE-and-bcl2-in-bone-marrow-derived-mesenchymal-stem-cells-from-multiple-myeloma-patients-and-normal-individuals
#14
Raziyeh Mansurabadi, Saeid Abroun, Abass Hajifathali, Amir Asri, Amir Atashi, Mansoureh Haghighi
OBJECTIVE: Multiple Myeloma (MM) is a heterogeneous cytogenetic disorder in which clonal plasma cells proliferate in the bone marrow (BM) and cause bone destruction. The BM microenvironment plays a crucial role in pathogenesis of this disease, and mesenchymal stem cells (MSCs) are one of the key players. Herein, we propose to investigate the expressions of hsa-MIR-204, runt-related transcription factor 2 (RUNX2), peroxisome proliferator-activated receptor gamma (PPARγ), and B-cell lymphoma 2 (BCL2) as factors involved in osteogenesis, adipogenesis, and MSC survival in BM-MSCs from MM patients and normal individuals...
2017: Cell Journal
https://www.readbyqxmd.com/read/28579851/transformation-of-follicular-lymphoma-to-a-high-grade-b-cell-lymphoma-with-myc-and-bcl2-translocations-and-overlapping-features-of-burkitt-lymphoma-and-acute-lymphoblastic-leukemia-a-case-report-and-literature-review
#15
Alina M Bischin, Russell Dorer, David M Aboulafia
Most commonly, histologic transformation (HT) from follicular lymphoma (FL) manifests as a diffuse large B-cell lymphoma, not otherwise specified (DLBCL, NOS). Less frequently, HT may result in a high-grade B-cell lymphoma (HGBL) with MYC and B-cell lymphoma protein 2 (BCL2) and/or BCL6 gene rearrangements, also known as "double-hit" or "triple-hit" lymphomas. In the 2016 revision of the World Health Organization (WHO) classification of lymphoid neoplasms, the category B-cell lymphoma, unclassifiable was eliminated due to its vague criteria and limiting diagnostic benefit...
2017: Clinical Medicine Insights. Blood Disorders
https://www.readbyqxmd.com/read/28577176/complement-c5a-induces-mesenchymal-stem-cell-apoptosis-during-the-progression-of-chronic-diabetic-complications
#16
Ming Zhu, Xiao He, Xiao-Hui Wang, Wei Qiu, Wei Xing, Wei Guo, Tian-Chen An, Luo-Quan Ao, Xue-Ting Hu, Zhan Li, Xiao-Ping Liu, Nan Xiao, Jian Yu, Hong Huang, Xiang Xu
AIMS/HYPOTHESIS: Regeneration and repair mediated by mesenchymal stem cells (MSCs) are key self-protection mechanisms against diabetic complications, a reflection of diabetes-related cell/tissue damage and dysfunction. MSC abnormalities have been reported during the progression of diabetic complications, but little is known about whether a deficiency in these cells plays a role in the pathogenesis of this disease. In addition to MSC resident sites, peripheral circulation is a major source of MSCs that participate in the regeneration and repair of damaged tissue...
June 3, 2017: Diabetologia
https://www.readbyqxmd.com/read/28576927/overcoming-the-immunosuppressive-tumor-microenvironment-of-hodgkin-lymphoma-using-chimeric-antigen-receptor-t-cells
#17
Marco Ruella, Michael Klichinsky, Saad S Kenderian, Olga Shestova, Amy Ziober, Daniel O Kraft, Michael Feldman, Mariusz A Wasik, Carl H June, Saar Gill
Some patients with otherwise treatment-resistant Hodgkin lymphoma (HL) could benefit from chimeric antigen receptor T cell (CART) therapy. However, HL lacks CD19 and contains a highly immunosuppressive tumor microenvironment (TME). We hypothesized that in HL, CART should target both malignant cells and the TME. We demonstrated CD123 on both HL cells and TME, including tumor-associated macrophages (TAM). In vitro, HL cells convert macrophages towards immunosuppressive TAM that inhibit T cell proliferation. In contrast, anti-CD123 CART recognized and killed TAM thus overcoming immunosuppression...
June 2, 2017: Cancer Discovery
https://www.readbyqxmd.com/read/28561693/age-and-sex-in-non-hodgkin-lymphoma-therapy-it-s-not-all-created-equal-or-is-it
#18
Michael Pfreundschuh
Age is the most prominent factor for survival in all patients diagnosed with lymphoma, and male sex implies an increased and independent risk for a worse progression-free survival (PFS) and overall survival (OS) in most lymphomas, possibly with the exception of mantle cell lymphoma (MCL). The worse outcome for elderly patients is only partially explained by decreased tolerance to treatment regimens associated with the increasing number and severity of comorbidities. Little is known about specific differences in lymphoma biology with respect to age and sex, and this is changing only slowly despite the recent rise in interest about these issues...
2017: American Society of Clinical Oncology Educational Book
https://www.readbyqxmd.com/read/28560185/deregulation-of-micrornas-in-gastric-lymphomagenesis-induced-in-the-d3tx-mouse-model-of-helicobacter-pylori-infection
#19
Pauline Floch, Caroline Capdevielle, Cathy Staedel, Julien Izotte, Elodie Sifré, Amandine M Laur, Alban Giese, Victoria Korolik, Pierre Dubus, Francis Mégraud, Philippe Lehours
Helicobacter pylori infection is considered as an excellent model of chronic inflammation-induced tumor development. Our project focuses on gastric MALT lymphoma (GML) related to H. pylori infection and mediated by the chronic inflammatory process initiated by the infection. Recently, microRNAs (miRNAs) have emerged as a new class of gene regulators, which play key roles in inflammation and carcinogenesis acting as oncogenes or tumor suppressors. Their precise characterization in the development of inflammation and their contribution in regulating host cells responses to infection by H...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28556516/emt-and-met-related-processes-in-non-epithelial-tumors-importance-for-disease-progression-prognosis-and-therapeutic-opportunities
#20
REVIEW
Ulf D Kahlert, Justin V Joseph, Frank A E Kruyt
The epithelial-to mesenchymal (EMT) process is increasingly recognized for playing a key role in the progression, dissemination and therapy resistance of epithelial tumors. Accumulating evidence suggests that EMT inducers also lead to a gain in mesenchymal properties and promote malignancy of non-epithelial tumors. In this review we present and discuss current findings, illustrating the importance of EMT inducers in tumors originating from non-epithelial/ mesenchymal tissues, including: brain tumors, hematopoietic malignancies and sarcomas...
May 28, 2017: Molecular Oncology
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