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Aberrant FGFR signaling mediates resistance to CDK4/6 inhibitors in ER+ breast cancer.
Formisano L, Lu Y, Servetto A, Hanker AB, Jansen VM, Bauer JA, Sudhan DR, Guerrero-Zotano AL, Croessmann S, Guo Y, Ericsson PG, Lee KM, Nixon MJ, Schwarz LJ, Sanders ME, Dugger TC, Cruz MR, Behdad A, Cristofanilli M, Bardia A, O'Shaughnessy J, Nagy RJ, Lanman RB, Solovieff N, He W, Miller M, Su F, Shyr Y, Mayer IA, Balko JM, Arteaga CL
(2019) Nat Commun 10: 1373
MeSH Terms: Aminopyridines, Animals, Antineoplastic Agents, Hormonal, Antineoplastic Combined Chemotherapy Protocols, Breast Neoplasms, Circulating Tumor DNA, Cyclin D1, Cyclin-Dependent Kinase 4, Cyclin-Dependent Kinase 6, Drug Resistance, Neoplasm, Female, Fulvestrant, High-Throughput Nucleotide Sequencing, Humans, MCF-7 Cells, Mice, Mutation, Naphthalenes, Piperazines, Progression-Free Survival, Proportional Hazards Models, Protein Kinase Inhibitors, Purines, Pyrazoles, Pyridines, Quinolines, Quinoxalines, Receptor, Fibroblast Growth Factor, Type 1, Receptor, Fibroblast Growth Factor, Type 2, Receptors, Estrogen, Signal Transduction, Xenograft Model Antitumor Assays
Show Abstract · Added April 2, 2019
Using an ORF kinome screen in MCF-7 cells treated with the CDK4/6 inhibitor ribociclib plus fulvestrant, we identified FGFR1 as a mechanism of drug resistance. FGFR1-amplified/ER+ breast cancer cells and MCF-7 cells transduced with FGFR1 were resistant to fulvestrant ± ribociclib or palbociclib. This resistance was abrogated by treatment with the FGFR tyrosine kinase inhibitor (TKI) lucitanib. Addition of the FGFR TKI erdafitinib to palbociclib/fulvestrant induced complete responses of FGFR1-amplified/ER+ patient-derived-xenografts. Next generation sequencing of circulating tumor DNA (ctDNA) in 34 patients after progression on CDK4/6 inhibitors identified FGFR1/2 amplification or activating mutations in 14/34 (41%) post-progression specimens. Finally, ctDNA from patients enrolled in MONALEESA-2, the registration trial of ribociclib, showed that patients with FGFR1 amplification exhibited a shorter progression-free survival compared to patients with wild type FGFR1. Thus, we propose breast cancers with FGFR pathway alterations should be considered for trials using combinations of ER, CDK4/6 and FGFR antagonists.
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32 MeSH Terms
Evaluation of the novel TSPO radiotracer 2-(7-butyl-2-(4-(2-([F]fluoroethoxy)phenyl)-5-methylpyrazolo[1,5-a]pyrimidin-3-yl)-N,N-diethylacetamide in a preclinical model of neuroinflammation.
Tang D, Fujinaga M, Hatori A, Zhang Y, Yamasaki T, Xie L, Mori W, Kumata K, Liu J, Manning HC, Huang G, Zhang MR
(2018) Eur J Med Chem 150: 1-8
MeSH Terms: Animals, Disease Models, Animal, Dose-Response Relationship, Drug, Fluorine Radioisotopes, Humans, Inflammation, Ischemia, Male, Mice, Molecular Probes, Molecular Structure, Positron-Emission Tomography, Pyrazoles, Pyrimidines, Radioactive Tracers, Radiopharmaceuticals, Rats, Rats, Sprague-Dawley, Receptors, GABA, Structure-Activity Relationship, Tissue Distribution
Show Abstract · Added March 22, 2018
Translocator Protein (18 kDa, TSPO) is regarded as a useful biomarker for neuroinflammation imaging. TSPO PET imaging could be used to understand the role of neuroinflammation in brain diseases and as a tool for evaluating novel therapeutic effects. As a promising TSPO probe, [F]DPA-714 is highly specific and offers reliable quantification of TSPO in vivo. In this study, we further radiosynthesized and evaluated another novel TSPO probe, 2-(7-butyl-2-(4-(2-[F]fluoroethoxy)phenyl)-5-methylpyrazolo[1,5-a]pyrimidin-3-yl)-N,N-diethylacetamide ([F]VUIIS1018A), which features a 700-fold higher binding affinity for TSPO than that of [F]DPA-714. We evaluated the performance of [F]VUIIS1018A using dynamic in vivo PET imaging, radiometabolite analysis, in vitro autoradiography assays, biodistribution analysis, and blocking assays. In vivo study using this probe demonstrated high signal-to-noise ratio, binding potential (BP), and binding specificity in preclinical neuroinflammation studies. Taken together, these findings indicate that [F]VUIIS1018A may serve as a novel TSPO PET probe for neuroinflammation imaging.
Copyright © 2018. Published by Elsevier Masson SAS.
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21 MeSH Terms
Characterization of atrial fibrillation adverse events reported in ibrutinib randomized controlled registration trials.
Brown JR, Moslehi J, O'Brien S, Ghia P, Hillmen P, Cymbalista F, Shanafelt TD, Fraser G, Rule S, Kipps TJ, Coutre S, Dilhuydy MS, Cramer P, Tedeschi A, Jaeger U, Dreyling M, Byrd JC, Howes A, Todd M, Vermeulen J, James DF, Clow F, Styles L, Valentino R, Wildgust M, Mahler M, Burger JA
(2017) Haematologica 102: 1796-1805
MeSH Terms: Adult, Aged, Aged, 80 and over, Antineoplastic Agents, Atrial Fibrillation, Disease Management, Female, Follow-Up Studies, Hemorrhage, Humans, Incidence, Male, Middle Aged, Protein Kinase Inhibitors, Pyrazoles, Pyrimidines, Randomized Controlled Trials as Topic, Risk Factors, Time Factors
Show Abstract · Added December 2, 2017
The first-in-class Bruton's tyrosine kinase inhibitor ibrutinib has proven clinical benefit in B-cell malignancies; however, atrial fibrillation (AF) has been reported in 6-16% of ibrutinib patients. We pooled data from 1505 chronic lymphocytic leukemia and mantle cell lymphoma patients enrolled in four large, randomized, controlled studies to characterize AF with ibrutinib and its management. AF incidence was 6.5% [95% Confidence Interval (CI): 4.8, 8.5] for ibrutinib at 16.6-months 1.6% (95%CI: 0.8, 2.8) for comparator and 10.4% (95%CI: 8.4, 12.9) at the 36-month follow up; estimated cumulative incidence: 13.8% (95%CI: 11.2, 16.8). Ibrutinib treatment, prior history of AF and age 65 years or over were independent risk factors for AF. Multiple AF events were more common with ibrutinib (44.9%; comparator, 16.7%) among patients with AF. Most (85.7%) patients with AF did not discontinue ibrutinib, and more than half received common anticoagulant/antiplatelet medications on study. Low-grade bleeds were more frequent with ibrutinib, but serious bleeds were uncommon (ibrutinib, 2.9%; comparator, 2.0%). Although the AF rate among older non-trial patients with comorbidities is likely underestimated by this dataset, these results suggest that AF among clinical trial patients is generally manageable without ibrutinib discontinuation ().
Copyright© 2017 Ferrata Storti Foundation.
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19 MeSH Terms
Discovery and Characterization of 1H-Pyrazol-5-yl-2-phenylacetamides as Novel, Non-Urea-Containing GIRK1/2 Potassium Channel Activators.
Wieting JM, Vadukoot AK, Sharma S, Abney KK, Bridges TM, Daniels JS, Morrison RD, Wickman K, Weaver CD, Hopkins CR
(2017) ACS Chem Neurosci 8: 1873-1879
MeSH Terms: Acetamides, Animals, Brain, G Protein-Coupled Inwardly-Rectifying Potassium Channels, HEK293 Cells, Humans, Liver, Membrane Transport Modulators, Mice, Microsomes, Liver, Molecular Structure, Pyrazoles, Structure-Activity Relationship
Show Abstract · Added April 3, 2018
The G protein-gated inwardly-rectifying potassium channels (GIRK, K3) are a family of inward-rectifying potassium channels, and there is significant evidence supporting the roles of GIRKs in a number of physiological processes and as potential targets for numerous indications. Previously reported urea containing molecules as GIRK1/2 preferring activators have had significant pharmacokinetic (PK) liabilities. Here we report a novel series of 1H-pyrazolo-5-yl-2-phenylacetamides in an effort to improve upon the PK properties. This series of compounds display nanomolar potency as GIRK1/2 activators with improved brain distribution (rodent K > 0.6).
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13 MeSH Terms
Myc enhances B-cell receptor signaling in precancerous B cells and confers resistance to Btk inhibition.
Moyo TK, Wilson CS, Moore DJ, Eischen CM
(2017) Oncogene 36: 4653-4661
MeSH Terms: Agammaglobulinaemia Tyrosine Kinase, Animals, B-Lymphocytes, CD79 Antigens, Cell Proliferation, Flow Cytometry, Humans, Lymphoma, Non-Hodgkin, Male, Mice, Mice, Inbred C57BL, Mitogen-Activated Protein Kinase 3, Phosphatidylinositol 3-Kinases, Phospholipase C gamma, Phosphorylation, Precancerous Conditions, Protein-Tyrosine Kinases, Proto-Oncogene Proteins c-myc, Pyrazoles, Pyrimidines, Receptors, Antigen, B-Cell, Splenic Neoplasms, Syk Kinase
Show Abstract · Added April 6, 2017
Dysregulation of the oncogenic transcription factor MYC induces B-cell transformation and is a driver for B-cell non-Hodgkin lymphoma (B-NHL). MYC overexpression in B-NHL is associated with more aggressive phenotypes and poor prognosis. Although genomic studies suggest a link between MYC overexpression and B-cell receptor (BCR) signaling molecules in B-NHL, signaling pathways essential to Myc-mediated B-cell transformation have not been fully elucidated. We utilized intracellular phospho-flow cytometry to investigate the relationship between Myc and BCR signaling in pre-malignant B cells. Utilizing the Eμ-myc mouse model, where Myc is overexpressed specifically in B cells, both basal and stimulated BCR signaling were increased in precancerous B lymphocytes from Eμ-myc mice compared with wild-type littermates. B cells overexpressing Myc displayed constitutively higher levels of activated CD79α, Btk, Plcγ2 and Erk1/2. Notably, Myc-overexpressing B cells maintained elevated BCR signaling despite treatment with ibrutinib, a Bruton's tyrosine kinase inhibitor. Furthermore, PI3K/Akt pathway signaling was also increased in Eμ-myc B cells, and this increase was partially suppressed with ibrutinib. In addition, experiments with Btk-null B cells revealed off-target effects of ibrutinib on BCR signaling. Our data show that in pre-malignant B cells, Myc overexpression is sufficient to activate BCR and PI3K/Akt signaling pathways and further enhances signaling following BCR ligation. Therefore, our results indicate that precancerous B cells have already acquired enhanced survival and growth capabilities before transformation, and that elevated MYC levels confer resistance to pharmacologic inhibitors of BCR signaling, which has significant implications for B-NHL treatment.
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23 MeSH Terms
Three-dimensional culture system identifies a new mode of cetuximab resistance and disease-relevant genes in colorectal cancer.
Li C, Singh B, Graves-Deal R, Ma H, Starchenko A, Fry WH, Lu Y, Wang Y, Bogatcheva G, Khan MP, Milne GL, Zhao S, Ayers GD, Li N, Hu H, Washington MK, Yeatman TJ, McDonald OG, Liu Q, Coffey RJ
(2017) Proc Natl Acad Sci U S A 114: E2852-E2861
MeSH Terms: Animals, Antineoplastic Agents, Immunological, Cell Culture Techniques, Cell Line, Tumor, Cetuximab, Colorectal Neoplasms, Crizotinib, Drug Resistance, Neoplasm, Gene Expression Regulation, Neoplastic, Humans, Hydroxyprostaglandin Dehydrogenases, Mice, Phosphorylation, Protein-Serine-Threonine Kinases, Proto-Oncogene Proteins c-akt, Pyrazoles, Pyridines, Receptor, Transforming Growth Factor-beta Type II, Receptors, Transforming Growth Factor beta, Tissue Array Analysis, Versicans, Xenograft Model Antitumor Assays
Show Abstract · Added May 3, 2017
We previously reported that single cells from a human colorectal cancer (CRC) cell line (HCA-7) formed either hollow single-layered polarized cysts or solid spiky masses when plated in 3D in type-I collagen. To begin in-depth analyses into whether clonal cysts and spiky masses possessed divergent properties, individual colonies of each morphology were isolated and expanded. The lines thus derived faithfully retained their parental cystic and spiky morphologies and were termed CC (cystic) and SC (spiky), respectively. Although both CC and SC expressed EGF receptor (EGFR), the EGFR-neutralizing monoclonal antibody, cetuximab, strongly inhibited growth of CC, whereas SC was resistant to growth inhibition, and this was coupled to increased tyrosine phosphorylation of MET and RON. Addition of the dual MET/RON tyrosine kinase inhibitor, crizotinib, restored cetuximab sensitivity in SC. To further characterize these two lines, we performed comprehensive genomic and transcriptomic analysis of CC and SC in 3D. One of the most up-regulated genes in CC was the tumor suppressor , and the most up-regulated gene in SC was () in 3D and xenografts. Analysis of a CRC tissue microarray showed that epithelial, but not stromal, VCAN staining strongly correlated with reduced survival, and combined epithelial VCAN and absent HPGD staining portended a poorer prognosis. Thus, with this 3D system, we have identified a mode of cetuximab resistance and a potential prognostic marker in CRC. As such, this represents a potentially powerful system to identify additional therapeutic strategies and disease-relevant genes in CRC and possibly other solid tumors.
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22 MeSH Terms
Ventricular arrhythmias and sudden death in patients taking ibrutinib.
Lampson BL, Yu L, Glynn RJ, Barrientos JC, Jacobsen ED, Banerji V, Jones JA, Walewska R, Savage KJ, Michaud GF, Moslehi JJ, Brown JR
(2017) Blood 129: 2581-2584
MeSH Terms: Arrhythmias, Cardiac, Death, Sudden, Cardiac, Humans, Leukemia, Lymphocytic, Chronic, B-Cell, Male, Middle Aged, Pyrazoles, Pyrimidines
Added March 26, 2017
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8 MeSH Terms
In vivo evaluation of IGF1R/IR PET ligand [F]BMS-754807 in rodents.
Prabhakaran J, Dewey SL, McClure R, Simpson NR, Tantawy MN, Mann JJ, Pham W, Kumar JSD
(2017) Bioorg Med Chem Lett 27: 941-943
MeSH Terms: Animals, Fluorine Radioisotopes, Heterografts, Humans, Mice, Positron-Emission Tomography, Pyrazoles, Radioligand Assay, Rats, Receptor, IGF Type 1, Receptor, Insulin, Triazines
Show Abstract · Added March 21, 2018
In vivo evaluation of [F]BMS-754807 binding in mice and rats using microPET and biodistribution methods is described herein. The radioligand shows consistent binding characteristics, in vivo, in both species. Early time frames of the microPET images and time activity curves of brain indicate poor penetration of the tracer across the blood brain barrier (BBB) in both species. However, microPET experiments in mice and rats show high binding of the radioligand outside the brain to heart, pancreas and muscle, the organs known for higher expression of IGF1R/1R. Biodistribution analysis 2h after injection of [F]BMS-754807 in rats show negligible [F]defluorination as reflected by the low bone uptake and clearance from blood. Overall, the data indicate that [F]BMS-754807 can potentially be a radiotracer for the quantification of IGF1R/IR outside the brain using PET.
Copyright © 2017 Elsevier Ltd. All rights reserved.
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12 MeSH Terms
New structure-activity relationships of N-acetamide substituted pyrazolopyrimidines as pharmacological ligands of TSPO.
Li J, Schulte ML, Nickels ML, Manning HC
(2016) Bioorg Med Chem Lett 26: 3472-7
MeSH Terms: Acetamides, Dose-Response Relationship, Drug, Humans, Ligands, Molecular Structure, Pyrazoles, Pyrimidines, Receptors, GABA, Structure-Activity Relationship
Show Abstract · Added April 6, 2017
Translocator protein (TSPO) represents an attractive target for molecular imaging and therapy due to its prevalence and critical roles played in oncology and other pathologies. Based upon our previously optimized pyrazolopyrimidine scaffold, we elucidated new structure activity relationships related to N,N-disubstitutions of the terminal acetamide on pyrazolopyrimidines and further explored the impacts of these substituents on lipophilicity and plasma protein binding. Several novel chemical probes reported here exhibited significantly increased binding affinity, suitable lipophilicity and protein binding compared with contemporary TSPO ligands. We illustrate that N,N-acetamide disubstitution affords opportunities to introduce diverse chemical moieties distal to the central pyrazolopyrimidine core, without sacrificing TSPO affinity. We anticipate that further exploration of N-acetamide substitutions may yield additional TSPO ligands capable of furthering the field of precision medicine.
Copyright © 2016 Elsevier Ltd. All rights reserved.
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9 MeSH Terms
BMP Antagonist Gremlin 2 Limits Inflammation After Myocardial Infarction.
Sanders LN, Schoenhard JA, Saleh MA, Mukherjee A, Ryzhov S, McMaster WG, Nolan K, Gumina RJ, Thompson TB, Magnuson MA, Harrison DG, Hatzopoulos AK
(2016) Circ Res 119: 434-49
MeSH Terms: Animals, Bone Morphogenetic Protein 2, Cells, Cultured, Endothelial Cells, Female, Humans, Inflammation, Male, Mice, Mice, 129 Strain, Mice, Inbred C57BL, Mice, Knockout, Mice, Transgenic, Myocardial Infarction, Myocytes, Cardiac, Proteins, Pyrazoles, Quinolines
Show Abstract · Added July 5, 2016
RATIONALE - We have recently shown that the bone morphogenetic protein (BMP) antagonist Gremlin 2 (Grem2) is required for early cardiac development and cardiomyocyte differentiation. Our initial studies discovered that Grem2 is strongly induced in the adult heart after experimental myocardial infarction (MI). However, the function of Grem2 and BMP-signaling inhibitors after cardiac injury is currently unknown.
OBJECTIVE - To investigate the role of Grem2 during cardiac repair and assess its potential to improve ventricular function after injury.
METHODS AND RESULTS - Our data show that Grem2 is transiently induced after MI in peri-infarct area cardiomyocytes during the inflammatory phase of cardiac tissue repair. By engineering loss- (Grem2(-/-)) and gain- (TG(Grem2)) of-Grem2-function mice, we discovered that Grem2 controls the magnitude of the inflammatory response and limits infiltration of inflammatory cells in peri-infarct ventricular tissue, improving cardiac function. Excessive inflammation in Grem2(-/-) mice after MI was because of overactivation of canonical BMP signaling, as proven by the rescue of the inflammatory phenotype through administration of the canonical BMP inhibitor, DMH1. Furthermore, intraperitoneal administration of Grem2 protein in wild-type mice was sufficient to reduce inflammation after MI. Cellular analyses showed that BMP2 acts with TNFα to induce expression of proinflammatory proteins in endothelial cells and promote adhesion of leukocytes, whereas Grem2 specifically inhibits the BMP2 effect.
CONCLUSIONS - Our results indicate that Grem2 provides a molecular barrier that controls the magnitude and extent of inflammatory cell infiltration by suppressing canonical BMP signaling, thereby providing a novel mechanism for limiting the adverse effects of excessive inflammation after MI.
© 2016 American Heart Association, Inc.
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18 MeSH Terms