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Tetsuya Yoshimoto, Tatsuhide Hayashi, Toshio Kondo, Mizuho Kittaka, Ernst J Reichenberger, Yasuyoshi Ueki
Cherubism is a craniofacial disorder characterized by maxillary and mandibular bone destruction. Gain-of-function mutations in the SH3-domain binding protein 2 (SH3BP2) are responsible for the excessive bone resorption caused by fibrous inflammatory lesions. A homozygous knock-in (KI) mouse model for cherubism (Sh3bp2KI/KI ) develops autoinflammation resulting in systemic bone destruction. While administration of the TNF-α blocker etanercept to neonatal Sh3bp2KI/KI mice prevented the disease onset, this therapy was not effective for adult Sh3bp2KI/KI mice or human cherubism patients who already had lesions...
April 18, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
Cody Paiva, Taylor A Rowland, Bhargava Sreekantham, Claire Godbersen, Scott R Best, Prabhjot Kaur, Marc M Loriaux, Stephen E F Spurgeon, Olga V Danilova, Alexey V Danilov
Although small molecule inhibitors of B-cell receptor-associated kinases have revolutionized therapy in chronic lymphocytic leukemia (CLL), responses are incomplete. Pro-survival signaling emanating from the microenvironment may foster therapeutic resistance of the malignant B cells resident in the protective lymphoid niches. B-cell activating factor (BAFF) is critical to the survival of both healthy and neoplastic B cells. However, the pro-survival pathways triggered by BAFF have not been fully characterized...
November 2017: Haematologica
Delong Liu, Aleksandra Mamorska-Dyga
Spleen tyrosine kinase (Syk) is a cytosolic non-receptor protein tyrosine kinase (PTK) and is mainly expressed in hematopoietic cells. Syk was recognized as a critical element in the B-cell receptor signaling pathway. Syk is also a key component in signal transduction from other immune receptors like Fc receptors and adhesion receptors. Several oral Syk inhibitors including fostamatinib (R788), entospletinib (GS-9973), cerdulatinib (PRT062070), and TAK-659 are being assessed in clinical trials. The second generation compound, entospletinib, showed promising results in clinical trials against B-cell malignancies, mainly chronic lymphoid leukemia...
July 28, 2017: Journal of Hematology & Oncology
Ana Colado, María Belén Almejún, Enrique Podaza, Denise Risnik, Carmen Stanganelli, Esteban Enrique Elías, Patricia Dos Santos, Irma Slavutsky, Horacio Fernández Grecco, María Cabrejo, Raimundo Fernando Bezares, Mirta Giordano, Romina Gamberale, Mercedes Borge
Small molecules targeting kinases involved in B cell receptor signaling are showing encouraging clinical activity in chronic lymphocytic leukemia (CLL) patients. Fostamatinib (R406) and entospletinib (GS-9973) are ATP-competitive inhibitors designed to target spleen tyrosine kinase (Syk) that have shown clinical activity with acceptable toxicity in trials with CLL patients. Preclinical studies with these inhibitors in CLL have focused on their effect in patient-derived leukemic B cells. In this work we show that clinically relevant doses of R406 and GS-9973 impaired the activation and proliferation of T cells from CLL patients...
April 2017: Cancer Immunology, Immunotherapy: CII
Srini Ramanathan, Julie A Di Paolo, Feng Jin, Lixin Shao, Shringi Sharma, Michelle Robeson, Brian P Kearney
BACKGROUND AND OBJECTIVES: Entospletinib is a selective, reversible, adenosine triphosphate-competitive small-molecule spleen tyrosine kinase (SYK) inhibitor that blocks B cell receptor-mediated signaling and proliferation in B lymphocytes. This study evaluated the safety, pharmacokinetics, and pharmacodynamics of entospletinib in a double-blind, single/multiple ascending dose study in healthy volunteers. METHODS: In sequential cohorts, 120 subjects received entospletinib (25-1200 mg; fasted) as single or twice-daily oral doses for 7 days...
February 2017: Clinical Drug Investigation
Marc Sorigue, Josep-Maria Ribera, Cristina Motlló, Juan-Manuel Sancho
Despite the improvement in prognosis since the advent of rituximab, follicular lymphoma is still incurable and remains the cause of death of most afflicted patients. With the expanding knowledge of the pathogenesis of B-cell malignancies, in the last few years a plethora of new therapies acting through a variety of mechanisms have shown promising results. This review attempts to analyze the evidence available on these new drugs, which include new monoclonal antibodies and immunoconjugates, the anti-angiogenic and immunomodulatory agent lenalidomide, the proteasome inhibitor bortezomib, inhibitors of B-cell receptor pathway enzymes, such as ibrutinib, idelalisib, duvelisib and entospletinib, BCL2 inhibitors and checkpoint inhibitors...
October 2016: Leukemia Research
Jeff Sharman, Julie Di Paolo
The B-cell receptor signaling pathway has emerged as an important therapeutic target in chronic lymphocytic leukemia and other B-cell malignancies. Novel agents have been developed targeting the signaling enzymes spleen tyrosine kinase (SYK), Bruton's tyrosine kinase, and phosphoinositide 3-kinase delta. This review discusses the rationale for targeting these enzymes, as well as the preclinical and clinical evidence supporting their role as therapeutic targets, with a particular focus on SYK inhibition with entospletinib...
June 2016: Therapeutic Advances in Hematology
Paul M Barr, Gene B Saylors, Stephen E Spurgeon, Bruce D Cheson, Daniel R Greenwald, Susan M O'Brien, Andre K D Liem, Rosemary E Mclntyre, Adarsh Joshi, Esteban Abella-Dominicis, Michael J Hawkins, Anita Reddy, Julie Di Paolo, Hank Lee, Joyce He, Jing Hu, Lyndah K Dreiling, Jonathan W Friedberg
Although agents targeting B-cell receptor signaling have provided practice-changing results in relapsed chronic lymphocytic leukemia (CLL) and non-Hodgkin lymphoma (NHL), they require prolonged administration and provide incomplete responses. Given synergistic preclinical activity with phosphatidylinositol 3-kinase δ and spleen tyrosine kinase inhibition, this phase 2 study evaluated the safety and efficacy of the combination of idelalisib and entospletinib. Eligible patients with relapsed or refractory CLL or NHL underwent intrapatient dose escalation with each agent...
May 19, 2016: Blood
Bjoern Chapuy, Hongwei Cheng, Akira Watahiki, Matthew D Ducar, Yuxiang Tan, Linfeng Chen, Margaretha G M Roemer, Jing Ouyang, Amanda L Christie, Liye Zhang, Daniel Gusenleitner, Ryan P Abo, Pedro Farinha, Frederike von Bonin, Aaron R Thorner, Heather H Sun, Randy D Gascoyne, Geraldine S Pinkus, Paul van Hummelen, Gerald G Wulf, Jon C Aster, David M Weinstock, Stefano Monti, Scott J Rodig, Yuzhuo Wang, Margaret A Shipp
Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous disease defined by transcriptional classifications, specific signaling and survival pathways, and multiple low-frequency genetic alterations. Preclinical model systems that capture the genetic and functional heterogeneity of DLBCL are urgently needed. Here, we generated and characterized a panel of large B-cell lymphoma (LBCL) patient-derived xenograft (PDX) models, including 8 that reflect the immunophenotypic, transcriptional, genetic, and functional heterogeneity of primary DLBCL and 1 that is a plasmablastic lymphoma...
May 5, 2016: Blood
Jeff Sharman, Michael Hawkins, Kathryn Kolibaba, Michael Boxer, Leonard Klein, Meihua Wu, Jing Hu, Steve Abella, Chris Yasenchak
Small-molecule inhibitors of kinases involved in B-cell receptor signaling are an important advance in managing lymphoid malignancies. Entospletinib (GS-9973) is an oral, selective inhibitor of spleen tyrosine kinase. This multicenter, phase 2 study enrolled subjects with relapsed or refractory chronic lymphocytic leukemia (CLL; n = 41) or non-Hodgkin lymphoma (n = 145). Participants received 800 mg entospletinib twice daily. We report efficacy outcomes in the CLL cohort (n = 41) and safety outcomes in all cohorts (N = 186)...
April 9, 2015: Blood
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