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CPUY201112, a novel synthetic small-molecule compound and inhibitor of heat shock protein Hsp90, induces p53-mediated apoptosis in MCF-7 cells.

Heat-shock protein 90 (Hsp90) is highly expressed in many tumor cells and is associated with the maintenance of malignant phenotypes. Targeting Hsp90 has had therapeutic success in both solid and hematological malignancies, which has inspired more studies to identify new Hsp90 inhibitors with improved clinical efficacy. Using a fragment-based approach and subsequent structural optimization guided by medicinal chemistry principles, we identified the novel compound CPUY201112 as a potent Hsp90 inhibitor. It binds to the ATP-binding pocket of Hsp90 with a kinetic dissociation (Kd) constant of 27

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… competition assay and ForteBio Octet RED 96 System assay Hsp90α (100 nmol/L) and FITC-geldanamycin (10 nmol/L) were incubated in a 96-well microplate at room temperature in the presence of assay buffer containing 20 mmol/L HEPES (pH 7.4), 50 mmol/L KCl, 5 mmol/L MgCl 2 , 20 mmol/L Na 2 MoO 4 , 2 mmol/L dithiothreitol …

Down-regulation of EHMT2 through irisin-mediated epigenetic modification promotes osteogenesis via promoting DLX3 transcription.

BACKGROUND: Irisin, a cleavage peptide by fibronectin type III domain-containing protein 5 (FNDC5), has been recognized as a promotor of osteogenesis to alleviate osteoporosis (OP). However, the detailed regulatory mechanism of osteogenesis remains unclear. This study uncovered the mechanisms underlying bone formation. METHODS: Osteogenic activity was evaluated by ALP and ARS staining. Expression of target molecules and osteogenic-related factors was assessed by RT-qPCR, Western blotting, and immunohistochemical staining. The binding of euchromatic histone lysine methyltransferase 2 (EHMT2) to

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… For Re-ChIP assay, the immune complex was eluted by 20 mmol/L dithiothreitol and then diluted in ChIP dilution buffer. Then, re-ChIP reaction was conducted. After washing with Tris‐EDTA buffer containing 1% SDS, the immunoprecipitated DNAs were purified. The enriched DNAs were assessed by RT-qPCR. …

Carfilzomib enhances cisplatin-induced apoptosis in SK-N-BE(2)-M17 human neuroblastoma cells.

Neuroblastoma is a solid malignant tumor of the sympathetic nervous system, which accounts for 8-10% of childhood cancers. Considering the overall high risk and poor prognosis associated with neuroblastoma, effective therapeutics should be developed to improve patient survival and quality of life. A recent study showed that a proteasome inhibitor, carfilzomib (CFZ), reduced cell viability of SK-N-BE(2)-M17 neuroblastoma cells. Therefore, we investigated the molecular mechanisms by which CFZ lower the cell viability of neuroblastoma cells. CFZ reduced cell viability via cell cycle arrest at G2/

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… Twenty micrograms of total cell lysates were denatured in 1 × SDS loading dye containing dithiothreitol. For western blot analysis, equal amounts of proteins were resolved by 10% SDS-polyacrylamide gel electrophoresis and analyzed. Proteins on the gel were transferred onto a PVDF membrane. …

Targeting HDACs with dacinostat amplifies radiation-induced DNA damage via sustained phosphorylated p53 and repair inhibition in aggressive meningioma.

The lack of standard systemic treatments in meningioma presents a therapeutic challenge, making radiotherapy a crucial intervention for recurrent, high-grade, or inoperable tumours. Nonetheless, the efficacy of radiotherapy is constrained by the inherent radioresistance of meningiomas, attributed to their proficient DNA damage repair and robust cell cycle checkpoint regulation. These biological barriers, along with anatomical constraints of avoiding damage to adjacent neural tissues, restrict dose escalation and therapeutic gains. Histone deacetylases (HDACs) are mediators of radioresistance i

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… Briefly, samples were reduced using dithiothreitol, subsequently alkylated with chloroacetamide, and digested by Lys-C protease and trypsin. …

HDAC Inhibition Induces PD-L1 Expression in a Novel Anaplastic Thyroid Cancer Cell Line.

While papillary thyroid cancer (PTC) has largely favorable prognosis, anaplastic thyroid cancer (ATC) is a rare but extremely aggressive malignancy with grim clinical outcome. Even though new therapeutic options are emerging for ATC, additional preclinical models and novel combinations are needed for specific subsets of patients. We established a novel cell line (PF49) from the malignant pleural effusion of a 68-year-old male patient with ATC that rapidly transformed from a BRAF and TERT promoter mutant PTC. PF49 cells demonstrated a robust migratory activity in vitro and strong invasive capac

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… Total cellular protein pellets were resuspended in electrophoresis sample buffer (62.5 mM Tris–HCl, pH 6.8, 2% SDS, 10% glycerol, 5 mM EDTA, 125 mg/mL urea, 100 mM dithiothreitol) and equal amounts of protein were loaded on 10% acrylamide gels. …

Roadmap for new practitioners to navigate the multiple myeloma landscape.

Multiple myeloma (MM) is a blood cancer in which monoclonal plasma cells cause end organ damage resulting in hypercalcemia, renal failure, anemia, and bone lesions. MM is considered incurable, however, recent advances in treatment have improved survival. Historically, MM has been treated with immunomodulatory drugs (IMiDs), proteosome inhibitors (PIs), and corticosteroids. While newer therapeutic approaches such as monoclonal antibodies and cellular therapies have broadened the treatment horizon, the selection and sequencing of these therapies has become more complex. This review aims to help

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… If unobtainable, dithiothreitol (DTT) may be used to determine blood type post-daratumumab infusion [ 36 ]. Elotuzumab (Empliciti) Elotuzumab is a humanized IgG1 monoclonal antibody directed toward SLAMF7, also called CS1 (cell surface glycoprotein CD2 subset 1). …

From the Clinic to the Bench and Back Again in One Dog Year: How a Cross-Species Pipeline to Identify New Treatments for Sarcoma Illuminates the Path Forward in Precision Medicine.

Cancer drug discovery is an inefficient process, with more than 90% of newly-discovered therapies failing to gain regulatory approval. Patient-derived models of cancer offer a promising new approach to identify new treatments; however, for rare cancers, such as sarcomas, access to patient samples is limited, which precludes development of patient-derived models. To address the limited access to patient samples, we have turned to pet dogs with naturally-occurring sarcomas. Although sarcomas make up <1% of all human cancers, sarcomas represent 15% of cancers in dogs. Because dogs have similar im

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… Samples were then reduced with 10 mM dithiothreitol for 45 min at 32°C and alkylated with 25 mM iodoacetamide for 45 min at room temperature. Trypsin was added to a 1:25 ratio (enzyme to total protein) and allowed to proceed for 18 h at 37°C. …

Interferon-Based Biopharmaceuticals: Overview on the Production, Purification, and Formulation.

The advent of biopharmaceuticals in modern medicine brought enormous benefits to the treatment of numerous human diseases and improved the well-being of many people worldwide. First introduced in the market in the early 1980s, the number of approved biopharmaceutical products has been steadily increasing, with therapeutic proteins, antibodies, and their derivatives accounting for most of the generated revenues. The success of pharmaceutical biotechnology is closely linked with remarkable developments in DNA recombinant technology, which has enabled the production of proteins with high specific

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… Using the Tris-sucrose-dithiothreitol hypertonic buffer, Rodríguez and coworkers [ 54 ] additionally showed the improved performance of osmotic shock for selective release of periplasmic IFNγ over methods based on lysozyme, pipetting, or dilution. … During this process, dithiothreitol (DTT) is commonly added to decrease non-native disulfide bonds [ 60 , 94 ]. …

Isatuximab: A Review in Transplant-Ineligible Newly Diagnosed Multiple Myeloma.

Isatuximab (isatuximab-irfc; SARCLISA®) is an anti-CD38 monoclonal antibody approved in the EU and the USA for use in combination with bortezomib, lenalidomide and dexamethasone for the treatment of adults with newly diagnosed multiple myeloma (NDMM) who are ineligible for autologous stem cell transplantation (ASCT). In a phase III study in this patient population, isatuximab-bortezomib-lenalidomide-dexamethasone significantly prolonged progression-free survival (PFS) and generally improved the depth of tumour response versus bortezomib-lenalidomide-dexamethasone. Overall survival (OS) data we

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… Among interference mitigation measures is the treatment of reagent RBCs with dithiothreitol (DTT; which denatures CD38) [ 7 , 8 , 21 ]; see local prescribing information for further details, including the effect of DTT on the Kell blood group system. …

Monitoring Minimal Residual Disease in Patients with Multiple Myeloma by Targeted Tracking Serum M-Protein Using Mass Spectrometry (EasyM).

PurposeWe investigated both the clinical utilities and the prognostic impacts of the clonotypic peptide mass spectrometry (MS)-EasyM, a blood-based minimal residual disease (MRD) monitoring protocol in multiple myeloma.Experimental designA total of 447 sequential serum samples from 56 patients with multiple myeloma were analyzed using EasyM. Patient-specific M-protein peptides were sequenced from diagnostic samples; sequential samples were quantified by EasyM to monitor the M-protein. The performance of EasyM was compared with serum immunofixation electrophoresis (IFE), bone marrow multiparame

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… .): dithiothreitol, iodoacetamide, ammonium sulfate, urea, and acetone. MS-grade formic acid (FA) and acetonitrile were from Thermo Fisher Scientific. ProteaseMAX Surfactant, PNGaseF, pepsin, trypsin, chymotrypsin, LysC, GluC, and AspN were from Promega. …

7-day longitudinal proteomics of critically ill patients: a pilot study.

An adult's health, indicated by measurable parameters, is stable over time. With the exception of circadian rhythms, variability in these parameters typically does not exceed 20%. In this pilot study, we looked into the stability of proteome in intensive care unit (ICU) patients. This was a single-center, prospective, observational pilot study of blood plasma from adult ICU patients with statistically heterogeneous patterns of clinically observed parameters. Eight week-long batches from seven patients (one patient participated twice) were analyzed by means of bottom-up proteomics. The data wer

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… In the first step, the samples were peptized with urea (6 M), and disulfide bonds were reduced with dithiothreitol (13 mM) during 30-minute incubation at 37 °C, in the second step free thiol groups of cysteines were alkylated with freshly prepared iodoacetamide (40 mM) during 30-minute incubation at …

Combined spatial metabolomics and 4D-DIA quantitative proteomics approaches to explore the relationship between lung cancer and the heart.

Lung cancer and cardiovascular disease pose persistent threats to human health, despite advancements in targeted therapy, percutaneous coronary intervention, and drug treatments. Challenges such as side effects, drug resistance, hospitalization rates, and mortality remain high. These diseases are closely linked, sharing common risk factors and intricately influencing each other. This study aims to investigate the interplay between lung disease and cardiovascular disease by examining changes in cardiac metabolites and protein expression using spatial metabolomics and 4D-DIA quantitative proteom

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… To the supernatants, 8 M urea was added to a final volume of 200ul, followed by reduction with 10 mM dithiothreitol (DTT) for 45 min at 37 °C, and alkylation with 50 mM iodoacetamide (IAM) for 15 min in a dark room at room temperature. …

High-Affinity DARPin Allows Targeting of MeV to Glioblastoma Multiforme in Combination with Protease Targeting without Loss of Potency.

Measles virus (MeV) is naturally cytolytic by extensive cell-to-cell fusion. Vaccine-derived MeV is toxic for cancer cells and is clinically tested as oncolytic virus. To combine the potential of MeV with enhanced safety, different targeting strategies have been described. We generated a receptor-targeted MeV by using receptor-blind viral attachment protein genetically fused to designed ankyrin repeat protein (DARPin) binding domains specific for the epidermal growth factor receptor (EGFR). To reduce on-target toxicity for EGFR+ healthy cells, we used an engineered viral fusion protein activat

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… The cell lysates were mixed 1:1 with 2× urea sample buffer (200 mM Tris-HCl [pH 6.8], 8 M urea, 5% SDS [w/v], 0.1 mM EDTA, 0.03% bromphenol blue [w/v], 1.5% dithiothreitol [w/v]), and denatured for 10 min at 95°C, then fractionated by SDS-PAGE, and blotted onto PVDF membranes (Hybond-P, GE Healthcare …

Prognostic Value of PSMB5 and Correlations with LC3II and Reactive Oxygen Species Levels in the Bone Marrow Mononuclear Cells of Bortezomib-Resistant Multiple Myeloma Patients.

Proteasome inhibitors (PIs) constitute the most common type of induction treatment for multiple myeloma. Interactions between the proteasome, autophagy, and reactive oxygen species (ROS) have been shown in the past, thus emphasizing the need for a better understanding of the underlying pathophysiology. For this study, bone marrow mononuclear cells from 110 myeloma patients were collected at different disease stages. PSMB5 and LC3I/II protein levels were determined using Western blot, proteasome proteolytic activity (PPA) with spectrofluorometry, and ROS with flow cytometry. PSMB5 accumulation

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… BMMCs were analyzed using a solution containing 1 M of 1,4-Dithiothreitol (DTT) (Cat. Number 10197777001, Merck, Darmstadt, Germany), as described in other publications [ 44 , 65 ]. …

Selective molecular inhibition of the HDAC6 ZnF-UBP binding domain impairs multiple myeloma cell function.

Multiple myeloma is a plasma cell malignancy with a poor prognosis despite the recent development of new therapeutic options. Histone deacetylase 6 (HDAC6) is overexpressed in multiple myeloma cells and may be involved in the acquisition of resistance to conventional anti-proteasome treatments. In addition to displaying a deacetylase catalytic activity, HDAC6 plays an essential role in the regulation of autophagy and cell death by recognizing ubiquitinated motifs from misfolded proteins through its C-terminal ZnF-UBP binding domain. These defective proteins are sent to the aggresome to facilit

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… Protein samples (30 μg) were mixed with loading buffer (50 mM Tris pH 6.8, 6.5% glycerol, 1% sodium dodecyl sulfate, 50 mM dithiothreitol, 0.012% bromophenol blue) and heated to 95 °C for 5 min. …

Selective MCL-1 inhibitor ABBV-467 is efficacious in tumor models but is associated with cardiac troponin increases in patients.

BackgroundMCL-1 is a prosurvival B-cell lymphoma 2 family protein that plays a critical role in tumor maintenance and survival and can act as a resistance factor to multiple anticancer therapies. Herein, we describe the generation and characterization of the highly potent and selective MCL-1 inhibitor ABBV-467 and present findings from a first-in-human trial that included patients with relapsed/refractory multiple myeloma (NCT04178902).MethodsBinding of ABBV-467 to human MCL-1 was assessed in multiple cell lines. The ability of ABBV-467 to induce tumor growth inhibition was investigated in xen

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… Then 10 µL of a 2× protein/probe/antibody mix was added to each well of increasing concentrations of test compound in assay buffer (20 mM potassium phosphate, pH 7.6, 50 mM NaCl, 1 mM ethylenediaminetetraacetic acid disodium salt dihydrate, 0.05% pluronic acid F-68, 1 mM DL-dithiothreitol) at room temperature …

The Society for Immunotherapy of Cancer consensus statement on immunotherapy for the treatment of multiple myeloma.

Outcomes in multiple myeloma (MM) have improved dramatically in the last two decades with the advent of novel therapies including immunomodulatory agents (IMiDs), proteasome inhibitors and monoclonal antibodies. In recent years, immunotherapy for the treatment of MM has advanced rapidly, with the approval of new targeted agents and monoclonal antibodies directed against myeloma cell-surface antigens, as well as maturing data from late stage trials of chimeric antigen receptor CAR T cells. Therapies that engage the immune system to treat myeloma offer significant clinical benefits with durable

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… The most common and widely validated method of interrupting anti-CD38 antibody binding to RBCs is to treat with the reducing agent dithiothreitol (DTT). 66 Importantly, DTT has the potential to denature other clinically significant antigens including Kell and Yt. 65 All approved dara-containing regimens …

DNA-hydrolysing activity of IgG antibodies from the sera of patients with schizophrenia.

It is believed that damage to the membranes of brain cells of schizophrenia (SCZ) patients induces the formation of autoantigens and autoantibodies. Nevertheless, the importance of immunological changes leading to the loss of tolerance to self-antigens in the genesis of SCZ has not been established. The MALDI mass spectra of the IgG light chains of 20 healthy donors were relatively homogeneous and characterized by one peak with only one maximum. In contrast to the healthy donors, the MALDI mass spectra of IgG light chains corresponding to 20 SCZ patients demonstrated, similarly to 20 autoimmun

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… the IgG peak after gel filtration; mixture of only 15 scz-IgGs containing no 17 000–17 400 Da light chains) for homogeneity under non-reducing conditions was performed in a 5–16% gradient gel containing 0.1% SDS, and for the polypeptide spectrum, in a reducing 12% gel containing 0.1% SDS and 50 mM dithiothreitol …

Understanding the Early Biological Effects of Isoprene-Derived Particulate Matter Enhanced by Anthropogenic Pollutants.

INTRODUCTION: Airborne fine particulate matter (PM2.5; particulate matter ≤ 2.5 μm in aerodynamic diameter) plays a key role in air quality, … lectrospray ionization (UPLC/ESI-HR-QTOFMS). Isoprene-derived SOA samples were also analyzed by the dithiothreitol (DTT) assay in order to characterize their reactive oxygen species (ROS)-generation potential. UNLABELLED: Organic synthesis of known isoprene-derived SOA precursors, which included isoprene epoxydiols (IEPOX), methacrylic acid epoxide (MAE), and i …

In Vivo and In Vitro Pharmacokinetic Studies of a Dual Topoisomerase I/II Inhibitor.

Due to high mortality rates, new and more effective drugs are urgently needed in cancer therapy. The novel dual topoisomerase inhibitor P8-D6, a dimethylaminoethyl-substituted pyridophenanthroline, showed in vitro impressive induction of apoptosis in tumors such as ovarian cancer or multiple myeloma compared to the current standard therapy. The purpose of this study was to investigate its in vitro and in vivo pharmacokinetics and to discover further potential drug candidates. Samples of plasma, various tissues, urine, feces, and cell culture supernatants were examined by HPLC. In addition, the

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… Afterward, a piece of 150–300 mg was cut off with a scalpel, divided into small parts, and homogenized with 1500 μL of ice-cold buffer (containing 0.25 M saccharose, 50 mM KCl, 1 mM EDTA, 10 mM potassium dihydrogen phosphate, and 1 mM dithiothreitol at pH 7.4) for about 5 min using a Potter S homogenizer …