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The combination therapy with venetoclax in therapeutic strategy of acute lymphoblastic leukemia.

BACKGROUND: Acute lymphoblastic leukemia (ALL) is characterized by the malignant transformation and proliferation of lymphoid progenitor cells in the bone marrow, blood, and extramedullary sites. Leukemic cells can develop drug resistance both before and after treatment, complicating disease management. Combination therapy with Venetoclax has been shown to enhance the efficacy of standard anti-leukemia drugs. Therefore, this study aims to review combination treatment strategies as potential therapeutic alternatives, drawing on evidence from previous published literature. METHODS: This narrativ

CML cells expressing the TEL/MDS1/EVI1 fusion are resistant to imatinib-induced apoptosis through inhibition of BAD, but are resensitized with ABT-737.

Chronic myeloid leukemia is the first disease in which the potential of molecular targeted therapy with tyrosine kinase inhibitors (TKIs) was realized. Despite this success, a proportion of patients, particularly with advanced disease, are, or become, resistant to this treatment. Overcoming resistance and uncovering the underlying mechanisms is vital for further improvement of clinical outcomes. Here we report the identification, development, and characterization of a novel chronic myeloid leukemia cell line carrying the additional chromosomal aberration t(3;12)(q26;p13) resulting in expressio

Gab2 signaling in chronic myeloid leukemia cells confers resistance to multiple Bcr-Abl inhibitors.

Grb2-associated binder 2 (Gab2) serves as a critical amplifier in the signaling network of Bcr-Abl, the driver of chronic myeloid leukemia (CML). Despite the success of tyrosine kinase inhibitors (TKIs) in CML treatment, TKI resistance, caused by mutations in Bcr-Abl or aberrant activity of its network partners, remains a clinical problem. Using inducible expression and knockdown systems, we analyzed the role of Gab2 in Bcr-Abl signaling in human CML cells, especially with respect to TKI sensitivity. We show for the first time that Gab2 signaling protects CML cells from various Bcr-Abl inhibit

Adherence is the critical factor for achieving molecular responses in patients with chronic myeloid leukemia who achieve complete cytogenetic responses on imatinib.

PURPOSE: There is a considerable variability in the level of molecular responses achieved with imatinib therapy in patients with chronic myeloid leukemia (CML). These differences could result from variable therapy adherence. METHODS: Eighty-seven patients with chronic-phase CML treated with imatinib 400 mg/d for a median of 59.7 months (range, 25 to 104 months) who had achieved complete cytogenetic response had adherence monitored during a 3-month period by using a microelectronic monitoring device. Adherence was correlated with levels of molecular response. Other factors that could influence

ABT-737 increases tyrosine kinase inhibitor-induced apoptosis in chronic myeloid leukemia cells through XIAP downregulation and sensitizes CD34(+) CD38(-) population to imatinib.

Chronic myeloid leukemia (CML) tumorigenicity is driven by the oncogenic BCR-ABL tyrosine kinase. Specific tyrosine kinase inhibitors (TKI) have been designed and are now used for the treatment of CML. These TKI induce apoptosis in leukemic cells in a BIM-dependent mechanism. We hypothesized that an increase in BIM activity could sensitize CML cells to TKI. We blocked the anti-apoptotic proteins of the Bcl-2 family by using ABT-737, a Bcl-2 and Bcl-XL inhibitor. ABT-737 modified Bcl-2 protein interactions toward a pro-apoptotic phenotype. Its combination with TKI resulted in a strong synergism

Different target range and cytotoxic specificity of adaphostin and 17-allylamino-17-demethoxygeldanamycin in imatinib-resistant and sensitive cell lines.

Imatinib mesylate is a selective inhibitor of the oncogenic tyrosine kinase, Bcr-Abl, and is widely used as a first-line treatment for chronic myeloid leukaemia (CML). Prolonged monotherapy is frequently associated with patients becoming refractory to imatinib. Therefore, there is considerable interest in small molecule inhibitors which may be used either as replacements or as adjuncts to existing imatinib therapy. For this purpose, it is most likely that drugs which do not share imatinib's mechanism of action will be most valuable. We compared two such compounds with different modes of action

Safety and Efficacy of Givinostat for Patients with Muscular Dystrophy: A Systematic Review.

INTRODUCTION: Muscular dystrophy (MD) refers to a group of genetic disorders leading to progressive weakness and degeneration of skeletal muscle. Among them, Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD) are the most common types. Histone deacetylase inhibitors (i.e., givinostat) is a recently approved therapy for DMD. In this systematic review, we aimed to evaluate givinostat in MD patients regarding safety and efficacy. METHODS: A systematic review was performed according to the PRISMA guidelines by searching through Medline, Embase, Cochrane Library, and Web of Scie

A Novel Hydroxamic Acid-Based Curcumin Derivative as Potent Histone Deacetylase Inhibitor for the Treatment of Glioblastoma.

Glioblastoma (GBM) is one of the most common primary and deadliest malignant brain tumor with chemoresistance and poor prognosis. There is a lack of effective chemotherapeutic drug for the treatment of GBM. In this work, we reported the preparation of a histone deacetylase (HDAC) inhibitor, DMC-HA, from the structural modification of natural product curcumin. DMC-HAs were tested in an HDAC inhibition assay and an 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay for cytotoxicity. It showed potent inhibition of HDAC1-2 and HDAC6 with IC50 values in the submicromolar conce

Epigenetic Mechanisms in DNA Double Strand Break Repair: A Clinical Review.

Upon the induction of DNA damage, the chromatin structure unwinds to allow access to enzymes to catalyse the repair. The regulation of the winding and unwinding of chromatin occurs via epigenetic modifications, which can alter gene expression without changing the DNA sequence. Epigenetic mechanisms such as histone acetylation and DNA methylation are known to be reversible and have been indicated to play different roles in the repair of DNA. More importantly, the inhibition of such mechanisms has been reported to play a role in the repair of double strand breaks, the most detrimental type of DN

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… HDACi have been classified into groups which include hydroxamates, cyclic peptides, aliphatic acids, benzamides and electrophilic ketones ( Voelter-Mahlknecht et al., 2005 ). … 2017) Phase III | Acute myeloid leukemia; myelodysplastic syndromes | Completed | No Phase II | Multiple myeloma; recurrent plasma cell myeloma; refractory/relapsed multiple myeloma; relapsed/refractory non-Hodgkin lymphoma; diffuse intrinsic pontine glioma | Active, not recruiting | No Mocetinostat | Benzamide …

Семья гистона деацетилазы в здравии и болезни.

Классические деацетилазы, включая классы I, II и IV, в зависимости от цинка, повсеместно присутствуют у млекопитающих и играют жизненно важную роль в многочисленных биологических процессах. На сегодняшний день eleven Были выявлены члены < < хисттон деацетилаза > > , а именно < < хиттон деацетилаза > > . 1 через гистонную деацетилазу 11. Растущий объем данных подчеркивает важнейшую роль этих гистоновых деацетилазов как в физиологических, так и патологических условиях. В частности, эти гистонные деацетилазы участвуют в различных клеточных процессах, включая воспаление, ме

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… (PMID: 31895948) | In vitro In vivo | Preclinical | 1. 1 μM, 10 μM, 1 mg/kg, 10 mg/kg (PMID: 31895948) Benzamides Entinostat (MS-275) | Class I selective | 1. Improved glycemic control and reduced obesity in diet-induced obese mice. (PMID: 33349332) 2. Stimulated osteoblast proliferation. … Structures of hydroxamic acids (e.g., vorinostat, panobinostat, belinostat), benzamides (e.g., entinostat, chidamide, mocetinostat), aliphatic acids (valproic acid, sodium butyrate), cyclic peptides (romidepsin, OKI-179), hydrazide-based inhibitors (DS-103, B6, eimbinostat), and others (e.g., SPA3074 …

Epigenetic modification in diabetic kidney disease.

Diabetic kidney disease (DKD) is a common microangiopathy in diabetic patients and the main cause of death in diabetic patients. The main manifestations of DKD are proteinuria and decreased renal filtration capacity. The glomerular filtration rate and urinary albumin level are two of the most important hallmarks of the progression of DKD. The classical treatment of DKD is controlling blood glucose and blood pressure. However, the commonly used clinical therapeutic strategies and the existing biomarkers only partially slow the progression of DKD and roughly predict disease progression. Therefor

Targeting abnormal DNA double-strand break repair in tyrosine kinase inhibitor-resistant chronic myeloid leukemias.

Resistance to imatinib (IM) and other tyrosine kinase inhibitors (TKI)s is an increasing problem in leukemias caused by expression of BCR-ABL1. As chronic myeloid leukemia (CML) cell lines expressing BCR-ABL1 utilize an alternative non-homologous end-joining pathway (ALT NHEJ) to repair DNA double-strand breaks (DSB)s, we asked whether this repair pathway is a novel therapeutic target in TKI-resistant disease. Notably, the steady state levels of two ALT NHEJ proteins, poly-(ADP-ribose) polymerase 1 (PARP1) and DNA ligase IIIα, were increased in the BCR-ABL1-positive CML cell line K562 and, to

Association of genetic polymorphisms in the influx transporter SLCO1B3 and the efflux transporter ABCB1 with imatinib pharmacokinetics in patients with chronic myeloid leukemia.

This study explored the association of 14 single nucleotide polymorphisms in three genes coding for influx transporters (SLC22A1, SLCO1B1, and SLCO1B3), two genes coding for efflux transporters (ABCB1 and ABCG2), and four genes coding for enzymes (CYP2C9, CYP2C19, CYP2D6, and CYP3A5) with the pharmacokinetics of imatinib in Japanese patients with chronic myeloid leukemia. Pharmacokinetic parameters were estimated by a population pharmacokinetic analysis based on 622 plasma samples from 34 patients at steady state. Approximately 4.6-fold variability in individual clearance was observed (range,

Rationally designed aberrant kinase-targeted endogenous protein nanomedicine against oncogene mutated/amplified refractory chronic myeloid leukemia.

Deregulated protein kinases play a very critical role in tumorigenesis, metastasis, and drug resistance of cancer. Although molecularly targeted small molecule kinase inhibitors (SMI) are effective against many types of cancer, point mutations in the kinase domain impart drug resistance, a major challenge in the clinic. A classic example is chronic myeloid leukemia (CML) caused by BCR-ABL fusion protein, wherein a BCR-ABL kinase inhibitor, imatinib (IM), was highly successful in the early chronic phase of the disease, but failed in the advanced stages due to amplification of oncogene or point

Instability of mRNA expression signatures of drug transporters in chronic myeloid leukemia patients resistant to imatinib.

Despite the success of imatinib mesylate (IM) in the treatment of chronic myeloid leukemia (CML), approximately 30% of patients are resistant to therapy, mostly due to unknown causes. To profile the expression signatures of drug transporters throughout IM therapy and correlate them with resistance, we quantified mRNA expression levels of the SLC22A12, ABCB1, ABCC1, ABCG2 and MVP genes in consecutive samples from peripheral blood or bone marrow of CML patients who were either responsive or resistant to IM. Additionally we identified and quantified BCR-ABL1 transcript variants and analyzed 1236T

Schizophrenia-like features in transgenic mice overexpressing human HO-1 in the astrocytic compartment.

Delineation of key molecules that act epigenetically to transduce diverse stressors into established patterns of disease would facilitate the advent of preventive and disease-modifying therapeutics for a host of neurological disorders. Herein, we demonstrate that selective overexpression of the stress protein heme oxygenase-1 (HO-1) in astrocytes of novel GFAP.HMOX1 transgenic mice results in subcortical oxidative stress and mitochondrial damage/autophagy; diminished neuronal reelin content (males); induction of Nurr1 and Pitx3 with attendant suppression of their targeting miRNAs, 145 and 133b

Tyrosine kinase inhibitor resistance in chronic myeloid leukemia cell lines: investigating resistance pathways.

There are three currently identified secondary resistance mechanisms observed in patients with chronic myeloid leukemia (CML) receiving tyrosine kinase inhibitors (TKIs). These are BCR-ABL kinase domain (KD) mutations, increased BCR-ABL expression, and overexpression of drug-efflux proteins (ABCB1 and ABCG2). To investigate the interplay between these three modes of resistance, three CML blast crisis cell lines (K562, its ABCB1-overexpressing variant K562 Dox, and KU812) were cultured in gradually increasing concentrations of imatinib to 2 μM, or dasatinib to 200 nM. Eight imatinib- and two da

RAD 001 (everolimus) prevents mTOR and Akt late re-activation in response to imatinib in chronic myeloid leukemia.

The mammalian target of rapamycin (mTOR) is one target of BCR-ABL fusion gene of chronic myeloid leukemia (CML). Moreover, it drives a compensatory route to Imatinib mesylate (IM) possibly involved in the progression of leukemic progenitors towards a drug-resistant phenotype. Accordingly, mTOR inhibitors are proposed for combined therapeutic strategies in CML. The major caveat in the use of mTOR inhibitors for cancer therapy comes from the induction of an mTOR-phosphatidylinositol 3 kinase (PI3k) feedback loop driving the retrograde activation of Akt. Here we show that the rapamycin derivative

Trials and Tribulations of MicroRNA Therapeutics.

The discovery of the link between microRNAs (miRNAs) and a myriad of human diseases, particularly various cancer types, has generated significant interest in exploring their potential as a novel class of drugs. This has led to substantial investments in interdisciplinary research fields such as biology, chemistry, and medical science for the development of miRNA-based therapies. Furthermore, the recent global success of SARS-CoV-2 mRNA vaccines against the COVID-19 pandemic has further revitalized interest in RNA-based immunotherapies, including miRNA-based approaches to cancer treatment. Cons

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… Similarly, arylamide derivatives have been shown to inhibit miR-21 maturation [ 206 ]. 4-benzoylamino-N-(prop-2-yn-1-yl)benzamides has been shown to increase the expression of PDCD4, the functional target of miR-21 [ 207 ]. …

Обобщение и оценка воздействия нанопчастей аторвастатина и аторвастатина на вызванную ими демиелинацию Cuprizone: модуляция прохода с сигналами Nrf2/NF-kB.

Множественный склероз (MS) является хроническим воспалительным заболеванием центральной нервной системы (CNS), характеризующимся повреждением миелинской оболочки и, со временем, постепенным неврологическим расстройством. Статины привлекли внимание к исследованиям в области MS из-за их антивоспалительных и нейрозащитных эффектов. ЦЕЛИ: В этом исследовании оценивалось, может ли аторвастатин улучшить поведение и гистопатологические изменения мозга мужчины C57BL/6 Мыши. Все группы мышей, за исключением контрольной группы, которая получила нормальное питание, были накормлены 0.2% (КПЗ) в их ежеднев