scholarly journals The Antineoplastic Role of STAT5 Inhibition in BCRABL1-Positive Cells Exposed to Pimozide Alone and in Combination with Dasatinib and Ponatinib

2021 ◽  
Author(s):  
Marco Santoro ◽  
Salvatrice Mancuso ◽  
Manlio Tolomeo ◽  
Rosaria Maria Pipitone ◽  
Stefania Grimaudo ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Cell Lines ◽  
K562 Cell ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Blue Dye ◽  
Association Effect

Background: Though tyrosine kinase inhibitors managed to reach outstanding responses in the treatment of Chronic Myeloid Leukemia, resistance is still a challenging point, occurring in approximately 10–20% of the cases, due to several mechanisms. STAT5 expression has been strictly linked to resistance and disease progression and may thus represent a significant target to overcome resistance to TKI in CML. The aim of the study is to explore the in vitro antineoplastic role of the STAT5 inhibitor Pimozide in association with 2nd and 3rd generation inhibitors on chronic myeloid leukemia cells. Methods: The cytotoxic effect was evaluated by the Trypan blue dye exclusion test. K562 cell lines were exposed to pimozide alone and in association with ponatinib and dasatinib at different concentrations to explore the drugs association effect and the in vitro cytotoxic concentrations. Conclusions: Pimozide showed a synergic effect when associated with ponatinib and dasatinib in survival inhibition of K562 cell lines. This results are of note and pave the way for a possible in vivo associations.

In Vitro Sensitivity to Tyrosine Kinase Inhibitors Is One of Possible Predictive Parameters for Therapy Switch In Patients with Chronic Myeloid Leukemia

Blood ◽  
2010 ◽  
Vol 116 (21) ◽  
pp. 2747-2747
Author(s):  
Marketa Zackova ◽  
Tereza Lopotova ◽  
Zuzana Ondrackova ◽  
Hana Klamova ◽  
Jana Moravcova
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Cell Lines ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Transcript Level ◽  
Molecular Response ◽  
Newly Diagnosed ◽  
Therapy Switch

Abstract Abstract 2747 Backround: Tyrosine kinase inhibitors (TKI) are very effective in chronic myeloid leukemia (CML) suppression, however, the problem with development of resistance in some patients exists. It is necessary to find optimal methods for therapy response prediction and for detection of resistance. Many studies on the resistance to imatinib therapy were performed on cell lines or model systems. However, these systems are not fully consistent with CML situation in vivo. Sensitivity to imatinib and its predictivity to molecular response in patients with de novo CML were tested in vitro on patients′ leukocytes by White et al. [Blood 2005; 106: 2520]. They found that IC50 values could be predictive mainly in patients with low Sokal score. Aims: To optimize in vitro method for evaluation of patients′ sensitivity to various TKIs and to test its predictivity for molecular response in therapy and/or after therapy change. Methods: The sensitivity to TKIs: imatinib, nilotinib and dasatinib were studied on leukocytes isolated from CML patients at diagnosis and various responses to treatment. Cell lines were used as controls. Isolated leukocytes/cell lines were cultivated with/without TKIs. Optimization of cultivation was performed on cell lines (ML-2, K562, CML-T2, JURL-MK1) and on leukocytes from CML newly diagnosed patients (15) and healthy donors (6). Various incubation times (4, 24, 48 and 72h) were tested. Concentrations of TKI were used in values near to physiological levels: 2 –3 concentrations for each inhibitor (1uM, 10uM imatinib, 0,5uM and 2uM nilotinib and 1nM, 10nM and 100nM dasatinib). In given time-points the cells were harvested and lysed for protein and mRNA analyses. Sensitivity to TKIs was tested by BCR-ABL kinase inhibition – via Crkl phosphorylation (western blots) and also by WT1 transcript level kinetics [Cilloni et al, Cancer 2004; 101: 979]. Quality of cultivation was tested by apoptosis level (RNA degradation, Annexin staining – Agilent Bioanalyzer 2100). Results: We found 48 h to be the optimal time for in vitro cultivation. This time was long enough to see TKIs dependent changes on protein as well as mRNA level. At this time the intensity of apoptosis was relatively low and did not influence results. The predictive ability of cultivation with TKIs was tested on patients at diagnosis (15), with optimal (5) and suboptimal response (5) and patient with therapy failure (13). The disease state of all patients was further monitored in range from 6 to 21 months (median 12 months) after cultivation. Mostly all of newly diagnosed patients were in vitro sensitive to all three TKIs, 10 of them achieved MMR (median 7 months, range 5 – 16) on imatinib. In patients with resistance to imanitib therapy the good sensitivity to one of 2nd generation TKI on in vitro tests represented the good response to this inhibitor, 4 patients from 10 on dasatinib achieved MMR (within 4 months), the other responded to therapy with continual decrease of BCR-ABL transcript level. Thus, the cultivation test can help with the therapy switch. However, the prognosis of patients with additive chromosomal aberration was poor even if they were sensitive to TKIs in vitro. Only one of 3 patients with 8 trisomy sensitive to dasatinib in vitro achieved MMR at 4th month after starting of dasatinib. Two patients with T315I were not sensitive to any of TKIs in vitro and in vivo, as it was expected. We continue to follow up of all patients. In conclusion, the results from in vitro cultivations of patients′ leukocytes with TKIs can help with the choice of efficient inhibitor for individual patient′s therapy, however, it is necessary to take into consideration the results of cytogenetic analyses of patients and other factors influencing CML. Supported by MZOUHKT2005. Disclosures: No relevant conflicts of interest to declare.

The BTK Inhibitor Ibrutinib Blocks SDF1/CXCR4 Mediated Migration of Acute Myeloid Leukemia Cells

Blood ◽  
2014 ◽  
Vol 124 (21) ◽  
pp. 915-915
Author(s):  
Stuart A Rushworth ◽  
Lyubov Zaitseva ◽  
Megan Y Murray ◽  
Matthew J Lawes ◽  
David J MacEwan ◽  
...  
Keyword(s):  
Acute Myeloid Leukemia ◽  
Cell Lines ◽  
Myeloid Leukemia ◽  
Conflicts Of Interest ◽  
Lymphocytic Leukemia ◽  
Cell Trafficking ◽  
Acute Myeloid

Abstract Introduction Despite recent significant progress in the understanding of the biology of acute myeloid leukemia (AML) the clinical outcomes for the majority of patients diagnosed with AML presently remain poor. Consequently, there is an urgent need to identify pharmacological strategies in AML, which are not only effective but can be tolerated by the older, less well patient. Recently our group and others have shown that there is high Bruton’s Tyrosine Kinase (BTK) phosphorylation and RNA expression in AML. Moreover, our recent study described for the first time that ibrutinib and BTK-targeted RNA interference reduced factor-induced proliferation of both AML cell lines and primary AML blasts, as well as reducing AML blast adhesion to bone marrow stromal cells. Inhibition of BTK has been shown to regulate chronic lymphocytic leukemia, mantle cell lymphoma and multiple myeloma cell migration by inhibiting SDF1 (stromal derived factor 1) induced CXCR4 regulated cell trafficking. Here we report that in human AML ibrutinib in addition functions in a similar way to inhibit SDF1/CXCR4-mediated AML migration at concentrations achievable in vivo. Methods To investigate the role of BTK in regulating AML migration we used both pharmacological inhibitor ibrutinib and genetic knockdown using a lentivirus mediated BTK targeted miRNA in primary AML blasts and AML cell lines. We examined migration of AML blasts and AML cells to SDF-1 using Transwell permeable plates with 8.0µM pores. Western blotting was used to examine the role of SDF-1 in regulating BTK, AKT and MAPK activation in primary AML blasts. Results We initially examined the expression of CXCR4 in human AML cell lines and found that 4/4 cell lines were positive for CXCR4 expression. Next we examined the effects of ibrutinib on the migration of the AML cell lines U937, MV4-11, HL60 and THP-1 in response to SDF1. We found that ibrutinib can inhibit the migration of all AML cell lines tested. We tested the in-vitro activity of ibrutinib on SDF-1 induced migration in a spectrum of primary AML blasts from a wide age spectrum of adult patients and across a range of WHO AML subclasses and found that ibrutinib significantly inhibits primary AML blast migration (n=12). Next we found that ibrutinib can inhibit SDF-1 induced BTK phosphorylation and downstream MAPK and AKT signalling in primary AML blast. Finally to eliminate the problems associated with off target ibrutinib activity we evaluated migration of AML cells lines using genetic inhibition of BTK. The introduction of BTK-specific miRNA dramatically inhibited the expression of BTK in THP-1 and HL60 and reduced SDF1 mediated migration confirming that BTK is involved in regulating AML migration in response to SDF1. Conclusions These results reported here provide a molecular mechanistic rationale for clinically evaluating BTK inhibition in AML patients and suggests that in some AML patients the blasts count may initially rise in response to ibrutinib therapy, analgous to similar clinical observations in CLL. Disclosures No relevant conflicts of interest to declare.

High STAT5 levels mediate imatinib resistance and indicate disease progression in chronic myeloid leukemia

Blood ◽  
2011 ◽  
Vol 117 (12) ◽  
pp. 3409-3420 ◽  
Author(s):  
Wolfgang Warsch ◽  
Karoline Kollmann ◽  
Eva Eckelhart ◽  
Sabine Fajmann ◽  
Sabine Cerny-Reiterer ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Disease Progression ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Clonal Selection ◽  
Imatinib Treatment ◽  
Imatinib Resistance ◽  
Protein Levels

Abstract In BCR-ABL1+ leukemia, drug resistance is often associated with up-regulation of BCR-ABL1 or multidrug transporters as well as BCR-ABL1 mutations. Here we show that the expression level of the transcription factor STAT5 is another parameter that determines the sensitivity of BCR-ABL1+ cells against tyrosine kinase inhibitors (TKIs), such as imatinib, nilotinib, or dasatinib. Abelson-transformed cells, expressing high levels of STAT5, were found to be significantly less sensitive to TKI-induced apoptosis in vitro and in vivo but not to other cytotoxic drugs, such as hydroxyurea, interferon-β, or Aca-dC. The STAT5-mediated protection requires tyrosine phosphorylation of STAT5 independent of JAK2 and transcriptional activity. In support of this concept, under imatinib treatment and with disease progression, STAT5 mRNA and protein levels increased in patients with Ph+ chronic myeloid leukemia. Based on our data, we propose a model in which disease progression in BCR-ABL1+ leukemia leads to up-regulated STAT5 expression. This may be in part the result of clonal selection of cells with high STAT5 levels. STAT5 then accounts for the resistance against TKIs, thereby explaining the dose escalation frequently required in patients reaching accelerated phase. It also suggests that STAT5 may serve as an attractive target to overcome imatinib resistance in BCR-ABL1+ leukemia.

scholarly journals Intracellular delivery of anti-BCR/ABL antibody by PLGA nanoparticles suppresses the oncogenesis of chronic myeloid leukemia cells

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Guoyun Jiang ◽  
Zhenglan Huang ◽  
Ying Yuan ◽  
Kun Tao ◽  
Wenli Feng
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Tyrosine Kinase ◽  
Myeloid Leukemia ◽  
Kinase Activity ◽  
Kinase Inhibitors ◽  
Fusion Gene ◽  
Intracellular Delivery ◽  
Tyrosine Kinase Activity

Abstract Background The pathogenesis of chronic myeloid leukemia (CML) is the formation of the BCR/ABL protein, which is encoded by the bcr/abl fusion gene, possessing abnormal tyrosine kinase activity. Despite the wide application of tyrosine kinase inhibitors (TKIs) in CML treatment, TKIs drug resistance or intolerance limits their further usage in a subset of patients. Furthermore, TKIs inhibit the tyrosine kinase activity of the BCR/ABL oncoprotein while failing to eliminate the pathologenic oncoprotein. To develop alternative strategies for CML treatment using therapeutic antibodies, and to address the issue that antibodies cannot pass through cell membranes, we have established a novel intracellular delivery of anti-BCR/ABL antibodies, which serves as a prerequisite for CML therapy. Methods Anti-BCR/ABL antibodies were encapsulated in poly(d, l-lactide-co-glycolide) nanoparticles (PLGA NPs) by a double emulsion method, and transferrin was labeled on the surface of the nanoparticles (Ab@Tf-Cou6-PLGA NPs). The characteristics of nanoparticles were measured by dynamic light scattering (DLS) and transmission electron microscopy (TEM). Cellular uptake of nanoparticles was measured by flow cytometry (FCM). The effect of nanoparticles on the apoptosis and proliferation of CML cells was testified by FCM and CCK-8 assay. In addition, the anti-cancer impact of nanoparticles was evaluated in mouse models of CML. Results The results demonstrated that the Ab@Tf-Cou6-PLGA NPs functioned as an intracellular deliverer of antibodies, and exhibited an excellent effect on degrading BCR/ABL oncoprotein in CML cells via the Trim-Away pathway. Treatment with Ab@Tf-Cou6-PLGA NPs inhibited the proliferation and induced the apoptosis of CML cells in vitro as well as impaired the oncogenesis ability of CML cells in vivo. Conclusions In conclusion, our study indicated that this approach achieved safe and efficient intracellular delivery of antibodies and degraded BCR/ABL oncoprotein via the Trim-Away pathway, which provides a promising therapeutic strategy for CML patients, particularly those with TKI resistance.

scholarly journals ALKBH5 Functions As an Oncogene in Acute Myeloid Leukemia

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 3910-3910
Author(s):  
Chao Shen ◽  
Yue Sheng ◽  
Rui Su ◽  
Xiaolan Deng ◽  
Sean Robinson ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Cell Lines ◽  
Myeloid Leukemia ◽  
Tp53 Mutation ◽  
Mouse Bone Marrow ◽  
Mutation Status ◽  
Acute Myeloid

Abstract N6-methyladenosine (m6A), the most abundant internal modification in eukaryotic messenger RNAs (mRNAs) has been shown to play important roles in diverse cellular and pathological processes (Deng X, et al. Cell Res. 2018;28:507-517). ALKBH5, recently identified as a m6A demethylase, was reported to promote tumorigenesis and proliferation in glioblastoma stem-like cells (GSCs) (Zhang, S. et al. Cancer Cell. 2017;31:591-606) and breast cancer stem cells (BCSCs) (Zhang, C et al. PNAS. 2016;113: E2047-E2056). While ALKBH5 is well-recognized to function as an oncogene in solid tumors, it was reported that shallow/deep deletion of ALKBH5 is associated poor prognosis in patients with acute myeloid leukemia (AML), and is frequently co-existing with TP53 mutation (Kwok, C. T et al. J Hematol Oncol. 2017; 10(1): 39), implying that ALKBH5 may function as a tumor suppressor in AML. Thus, a systematic investigation of the definitive role of ALKBH5 in AML is warranted. To this end, we performed series of in vitro and in vivo experiments to determine the function of ALKBH5 in AML. For the in vitro experiments, we used three lentiviral shRNAs (shALKBH5-A, shALKBH5-D and shALKBH5-E) to deplete ALKBH5 expression in three human AML cell lines with different TP53 mutation status: NOMO-1 (TP53-mutant), MV4;11 (TP53-WT) and MA9.3 cells (TP53-WT). Somewhat surprisingly, ALKBH5 depletion significantly (p<0.05) inhibited AML cell proliferation/growth in all three AML cells lines, regardless of the status of TP53 mutation. We next conducted colony forming assays and found that ALKBH5 knockdown significantly (p<0.01) impaired the colony forming ability to 18% ~45% of the control group level in all three AML cell lines. We further showed that ALKBH5 depletion caused a significant increase in apoptosis (with a 1.5 ~ 4 fold increase; p<0.001) in all three AML cell lines, which is consistent with the previous report that knockout of ALKBH5 caused severe apoptosis of mouse testis cells (Zheng G et al. Mol Cell. 2013; 49:18-29). In contrast, ALKBH5 knockdown did not significantly affect cell cycles. To further confirm ALKBH5's role in AML development in vivo. We utilized Xenografted AML model as well as mouse bone marrow transplantation (BMT) model. Consistent with the in vitro results, we found that NSGS mice xeno-transplanted with MV4;11-ALKBH5-knockdown cells survived significantly longer than those with MV4;11 control cells (p<0.001). Moreover, we have also conducted mouse bone marrow transplantation (BMT) assays with MLL-AF9-transduced mouse bone marrow lineage negative (Lin-) progenitor cells collected from mice carrying Alkbh5 wild-type (Alkbh5+/+), or heterozygous (Alkbh5+/-) or homozygous (Alkbh5-/-) deletion. Consistent with the xeno-transplanted mouse model results, our BMT assays also showed that Alkbh5 depletion significantly inhibited leukemogenesis and prolonged survival in BMT recipient mice (median survival of ALKBH5wt/wt +MA9 vs. ALKBH5+/- +MA9 or ALKBH5-/- +MA9: 32 days vs. 64 days or 68 days; p<0.005). Taken together, our in vitro and in vivo functional studies data indicate ALKBH5 also functions as an oncogene in AML regardless of TP53 mutation status, similar to its role in solid tumors. We are currently conducting as series of studies to reveal the molecular mechanism(s) underlying the oncogenic role of ALKBH5 in AML. Disclosures No relevant conflicts of interest to declare.

scholarly journals Target Inhibition of CBP Induced Cell Senescence in BCR-ABL- T315I Mutant Chronic Myeloid Leukemia

2021 ◽  
Vol 10 ◽  
Author(s):  
Ke Yang ◽  
Fang Wang ◽  
Hong Zhang ◽  
Xiaokun Wang ◽  
Likun Chen ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Clinical Success ◽  
Cell Senescence ◽  
Creb Binding Protein ◽  
Hematopoietic Stem ◽  
T315i Mutation

The treatment of chronic myeloid leukemia (CML) with BCR-ABL tyrosine kinase inhibitors (TKIs), such as imatinib, has yielded clinical success. However, the direct targeting of BCR-ABL does not eradicate CML cells expressing mutant BCR-ABL, especially the T315I mutation in BCR-ABL. Moreover, increasing mutations were identified in BCR-ABL domain, resulting in TKIs resistance recently. It is necessary to find BCR-ABL-independent target for treating CML patients with various mutations, including T315I mutation in BCR-ABL. The dichotomous behavior of CREB binding protein (CBP) and E1A protein (p300), recruited by β-catenin associated with self-renewal and differentiation, have been identified in hematopoietic stem cells, respectively. In this study, CBP was aberrantly expressed in CML cells on the basis of Oncomine dataset. The β-catenin bound with much more CBP than p300 in CML cells. Down-regulation of CBP inhibited cell proliferation capacity and increased the binding of β-catenin to p300, thus promoting cell differentiation and p53-dependent cell senescence in CML cells with either wild type or T315I mutant BCR-ABL in vitro and in vivo models. These demonstrate CBP blockage can be developed for the treatment of CML independent of BCR-ABL mutation status including T315I.

A REVIEW ON THE ROLE OF TYROSINE KINASE INHIBITORS AVAILABLE FOR THE MANAGEMENT OF CHRONIC MYELOID LEUKEMIA

2020 ◽  
Vol 7 (2) ◽  
pp. 205-211
Author(s):  
Kaynat Fatima ◽  
Syed Tasleem Raza ◽  
Ale Eba ◽  
Sanchita Srivastava ◽  
Farzana Mahdi
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Tyrosine Kinase ◽  
Protein Kinases ◽  
Tyrosine Kinase Inhibitors ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Line Treatment ◽  
First Line ◽  
First Line Treatment

The function of protein kinases is to transfer a γ-phosphate group from ATP to serine, threonine, or tyrosine residues. Many of these kinases are linked to the initiation and development of human cancer. The recent development of small molecule kinase inhibitors for the treatment of different types of cancer in clinical therapy has proven successful. Significantly, after the G-protein-coupled receptors, protein kinases are the second most active category of drug targets. Imatinib mesylate was the first tyrosine kinase inhibitor (TKI), approved for chronic myeloid leukemia (CML) treatment. Imatinib induces appropriate responses in ~60% of patients; with ~20% discontinuing therapy due to sensitivity, and ~20% developing drug resistance. The introduction of newer TKIs such as, nilotinib, dasatinib, bosutinib, and ponatinib has provided patients with multiple options. Such agents are more active, have specific profiles of side effects and are more likely to reach the necessary milestones. First-line treatment decisions must be focused on CML risk, patient preferences and comorbidities. Given the excellent result, half of the patients eventually fail to seek first-line treatment (due to discomfort or resistance), with many of them needing a third or even further therapy lines. In the present review, we will address the role of tyrosine kinase inhibitors in therapy for chronic myeloid leukemia.

scholarly journals Progression and Differentiation of Alveolar Rhabdomyosarcoma Is Regulated by PAX7 Transcription Factor—Significance of Tumor Subclones

Cells ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1870
Author(s):  
Klaudia Skrzypek ◽  
Grażyna Adamek ◽  
Marta Kot ◽  
Bogna Badyra ◽  
Marcin Majka
Keyword(s):  
Transcription Factor ◽  
Cell Lines ◽  
Migration Activity ◽  
Id Proteins ◽  
Rh30 Cell ◽  
Str Profile ◽  
And Migration

Rhabdomyosarcoma (RMS), is the most frequent soft tissue tumor in children that originates from disturbances in differentiation process. Mechanisms leading to the development of RMS are still poorly understood. Therefore, by analysis of two RMS RH30 cell line subclones, one subclone PAX7 negative, while the second one PAX7 positive, and comparison with other RMS cell lines we aimed at identifying new mechanisms crucial for RMS progression. RH30 subclones were characterized by the same STR profile, but different morphology, rate of proliferation, migration activity and chemotactic abilities in vitro, as well as differences in tumor morphology and growth in vivo. Our analysis indicated a different level of expression of adhesion molecules (e.g., from VLA and ICAM families), myogenic microRNAs, such as miR-206 and transcription factors, such as MYOD, MYOG, SIX1, and ID. Silencing of PAX7 transcription factor with siRNA confirmed the crucial role of PAX7 transcription factor in proliferation, differentiation and migration of RMS cells. To conclude, our results suggest that tumor cell lines with the same STR profile can produce subclones that differ in many features and indicate crucial roles of PAX7 and ID proteins in the development of RMS.

scholarly journals Identification of Hsp90 inhibitors as potential drugs for the treatment of TSC1/TSC2 deficient cancer

2021 ◽  
Author(s):  
Evelyn M. Mrozek ◽  
Vineeta Bajaj ◽  
Yanan Guo ◽  
Izabela Malinowska ◽  
Jianming Zhang ◽  
...  
Keyword(s):  
Cell Lines ◽  
Kinase Inhibitors ◽  
Kinase Inhibitor ◽  
Xenograft Model ◽  
Growth Delay ◽  
Hsp90 Inhibitors ◽  
Null Cell ◽  
Standard Dosage

Inactivating mutations in either TSC1 or TSC2 cause Tuberous Sclerosis Complex, an autosomal dominant disorder, characterized by multi-system tumor and hamartoma development. Mutation and loss of function of TSC1 and/or TSC2 also occur in a variety of sporadic cancers, and rapamycin and related drugs show highly variable treatment benefit in patients with such cancers. The TSC1 and TSC2 proteins function in a complex that inhibits mTORC1, a key regulator of cell growth, which acts to enhance anabolic biosynthetic pathways. In this study, we identified and validated five cancer cell lines with TSC1 or TSC2 mutations and performed a kinase inhibitor drug screen with 197 compounds. The five cell lines were sensitive to several mTOR inhibitors, and cell cycle kinase and HSP90 kinase inhibitors. The IC50 for Torin1 and INK128, both mTOR kinase inhibitors, was significantly increased in three TSC2 null cell lines in which TSC2 expression was restored.  Rapamycin was significantly more effective than either INK128 or ganetespib (an HSP90 inhibitor) in reducing the growth of TSC2 null SNU-398 cells in a xenograft model. Combination ganetespib-rapamycin showed no significant enhancement of growth suppression over rapamycin. Hence, although HSP90 inhibitors show strong inhibition of TSC1/TSC2 null cell line growth in vitro, ganetespib showed little benefit at standard dosage in vivo. In contrast, rapamycin which showed very modest growth inhibition in vitro was the best agent for in vivo treatment, but did not cause tumor regression, only growth delay.

scholarly journals Anti-leukemia properties of cadmium nanoparticles in the in vitro and in vivo condition: A chemobiological study

2021 ◽  
Author(s):  
Yudi Miao ◽  
Behnam Mahdavi ◽  
Mohammad Zangeneh
Keyword(s):  
Acute Myeloid Leukemia ◽  
Cell Lines ◽  
Aqueous Extract ◽  
Myeloid Leukemia ◽  
Antioxidant Properties ◽  
Leukemia Cell ◽  
Sem Images ◽  
Acute Myeloid

IntroductionThe present study investigated the anti-acute myeloid leukemia effects of Ziziphora clinopodides Lam leaf aqueous extract conjugated cadmium nanoparticles.Material and methodsTo synthesize CdNPs, Z. clinopodides aqueous extract was mixed with Cd(NO3)2 .4H2O. The characterization of the biosynthesized cadmium nanoparticles was carried out using many various techniques such as UV-Vis. and FT-IR spectroscopy, XRD, FE-SEM, and EDS.ResultsThe uniform spherical morphology of NPs was proved by FE-SEM images with NPs the average size of 26.78cnm. For investigating the antioxidant properties of Cd(NO3)2, Z. clinopodides, CdNPs, and Daunorubicin, the DPPH test was used. The cadmium nanoparticles inhibited half of the DPPH molecules in a concentration of 196 µg/mL. To survey the cytotoxicity and anti-acute myeloid leukemia effects of Cd(NO3)2, Z. clinopodides, CdNPs, and Daunorubicin, MTT assay was used on the human acute myeloid leukemia cell lines i.e., Murine C1498, 32D-FLT3-ITD, and Human HL-60/vcr. The IC50 of the cadmium nanoparticles was 168, 205, and 210 µg/mL against Murine C1498, 32D-FLT3-ITD, and Human HL-60/vcr cell lines, respectively. In the part of in vivo study, DMBA was used for inducing acute myeloid leukemia in mice. CdNPs similar to daunorubicin ameliorated significantly (p≤0.01) the biochemical, inflammatory, RBC, WBC, platelet, stereological, histopathological, and cellular-molecular parameters compared to the other groups.ConclusionsAs mentioned, the cadmium nanoparticles had significant anti-acute myeloid leukemia effects. After approving the above results in the clinical trial studies, these cadmium nanoparticles can be used as a chemotherapeutic drug to treat acute myeloid leukemia in humans.

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