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Transcriptional Reprogramming Regulates Tumor Cell Survival in Response to Ionizing Radiation: a Role of p53. Bull Exp Biol Med 2023; 174:659-665. [PMID: 37060380 DOI: 10.1007/s10517-023-05764-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Indexed: 04/16/2023]
Abstract
Senexin B, a non-toxic selective inhibitor of cyclin-dependent protein kinases 8 and 19 (CDK8 and CDK19), in combination with γ-photon irradiation in doses of 2-10 Gy increased the death of colon adenocarcinoma cell line HCT116 (intact p53) in a logarithmically growing culture, which was accompanied by the prevention of cell cycle arrest and a decrease of "senescence" phenotype. The effect of senexin B in cells with intact p53 is similar to that of Tp53 gene knockout: irradiated HCT116p53KO cells passed through the interphase and died independently of senexin B. The inhibitor reduced the ability of cells to colony formation in response to irradiation; p53 status did not affect the effectiveness of the combination of radiation and senexin B. Thus, the CDK8/19 inhibitor senexin B increased cell sensitivity to radiotherapy by mechanisms dependent and independent of p53 status.
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2
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PROTAC: targeted drug strategy. Principles and limitations. Russ Chem Bull 2022; 71:2310-2334. [PMID: 36569659 PMCID: PMC9762658 DOI: 10.1007/s11172-022-3659-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 06/08/2022] [Accepted: 06/20/2022] [Indexed: 12/23/2022]
Abstract
The PROTAC (PROteolysis TArgeting Chimera) technology is a method of targeting intracellular proteins previously considered undruggable. This technology utilizes the ubiquitin-proteasome system in cells to specifically degrade target proteins, thereby offering significant advantages over conventional small-molecule inhibitors of the enzymatic function. Preclinical and preliminary clinical trials of PROTAC-based compounds (degraders) are presented. The review considers the general principles of the design of degraders. Advances and challenges of the PROTAC technology are discussed.
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3
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Suppression of PI3K/Akt/mTOR Signaling Pathway and Antioxidant System and Reversal of Cancer Cells Resistance to Cisplatin under the Effect of Curcumin. Bull Exp Biol Med 2022; 173:371-375. [DOI: 10.1007/s10517-022-05551-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Indexed: 10/17/2022]
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4
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Aureolic Acid-Derived Antibiotics: Prospects for a Biologically Active Class. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1068162022020121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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Inhibition of the c-Myc Oncogene by the Aureolic Acid Group Antibiotics. DOKL BIOCHEM BIOPHYS 2021; 500:308-311. [PMID: 34697733 DOI: 10.1134/s1607672921050094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 11/23/2022]
Abstract
GC-rich stretches in the DNA minor groove are the established intracellular targets for the aureolic acid group of antibiotics such as olivomycin A and its semisynthetic analogue olivamide. We demonstrated here that both antibiotics at nanomolar concentrations inhibited transcription of the c-Myc oncogene in cultured human tumor cells. The mechanism of transcriptional inhibition did not require the full-length binding site for Sp1, a GC-dependent transcriptional factor. GC quartets with the nucleotide sequences optimal for drug binding are sufficient for c-Myc transcriptional block by the aureolic acid derivatives.
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6
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Non-Phosphorus Lipids As New Antitumor Drug Prototypes. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1068162021050356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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7
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PHF10 subunit of PBAF complex mediates transcriptional activation by MYC. Oncogene 2021; 40:6071-6080. [PMID: 34465901 PMCID: PMC8863208 DOI: 10.1038/s41388-021-01994-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 07/24/2021] [Accepted: 08/10/2021] [Indexed: 02/08/2023]
Abstract
The PBAF complex, a member of SWI/SNF family of chromatin remodelers, plays an essential role in transcriptional regulation. We revealed a disease progression associated elevation of PHF10 subunit of PBAF in clinical melanoma samples. In melanoma cell lines, PHF10 interacts with MYC and facilitates the recruitment of PBAF complex to target gene promoters, therefore, augmenting MYC transcriptional activation of genes involved in the cell cycle progression. Depletion of either PHF10 or MYC induced G1 accumulation and a senescence-like phenotype. Our data identify PHF10 as a pro-oncogenic mechanism and an essential novel link between chromatin remodeling and MYC-dependent gene transcription.
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The p53 Protein Family in the Response of Tumor Cells to Ionizing Radiation: Problem Development. Acta Naturae 2021; 13:65-76. [PMID: 34707898 PMCID: PMC8526179 DOI: 10.32607/actanaturae.11247] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Accepted: 12/24/2020] [Indexed: 12/05/2022] Open
Abstract
Survival mechanisms are activated in tumor cells in response to therapeutic ionizing radiation. This reduces a treatment's effectiveness. The p53, p63, and p73 proteins belonging to the family of proteins that regulate the numerous pathways of intracellular signal transduction play a key role in the development of radioresistance. This review analyzes the p53-dependent and p53-independent mechanisms involved in overcoming the resistance of tumor cells to radiation exposure.
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9
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Super-Enhancers in the Regulation of Gene Transcription: General Aspects and Antitumor Targets. Acta Naturae 2021; 13:4-15. [PMID: 33959383 PMCID: PMC8084300 DOI: 10.32607/actanaturae.11067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 09/07/2020] [Indexed: 01/18/2023] Open
Abstract
Super-enhancers (genome elements that activate gene transcription) are DNA regions with an elevated concentration of transcriptional complexes. These multiprotein structures contain, among other components, the cyclin-dependent kinases 8 and 19. These and other transcriptional protein kinases are regarded as novel targets for pharmacological inhibition by antitumor drug candidates.
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10
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The Prospects of Metal Oxide Nanoradiosensitizers: The Effect of the Elemental Composition of Particles and Characteristics of Radiation Sources on Enhancement of the Adsorbed Dose. Biophysics (Nagoya-shi) 2020. [DOI: 10.1134/s0006350920040107] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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11
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Recombinant Spidroin Films Attenuate Individual Markers of Glucose Induced Aging in NIH 3T3 Fibroblasts. BIOCHEMISTRY (MOSCOW) 2020; 85:808-819. [PMID: 33040725 DOI: 10.1134/s0006297920070093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The effect of bioresorbable materials on aging in cultured mouse NIH 3T3 fibroblasts treated with elevated glucose concentration was investigated. The cells were grown on films produced from the silkworm fibroin and rS1/9, a recombinant analog of Nephila clavipes spidroin 1. Exposure to 50 mM glucose of the cells grown on uncoated glass support resulted in the cell growth retardation. The average areas of the cells and nuclei and the percentage of apoptotic cells increased, whereas the amount of soluble collagen decreased. In contrast, on the fibroin and spidroin films, the cell density and the percentage of 5-bromo-2'-deoxyuridine (BrdU)-positive cells were higher vs. the cells grown on the glass support. The films protected NIH 3T3 fibroblasts from the glucose-induced death. The most prominent effects on the cell density, BrdU incorporation, and apoptosis prevention were observed in the cells cultured on spidroin films. Unlike the cells grown on glass support (decrease in the soluble collagen production) or fibroin (no effect), production of soluble collagen by the cells grown on spidroin films increased after cell exposure to 50 mM glucose. Molecular analysis demonstrated that 50 mM glucose upregulated phosphorylation of the NFκB heterodimer p65 subunit in the cells grown on the glass support. The treatment of cells grown on fibroin films with 5.5 mM or 50 mM glucose had no effect on p65 phosphorylation. The same treatment decreased p65 phosphorylation in the cells on the spidroin films. These results demonstrate the anti-aging efficacy of biomaterials derived from the silk proteins and suggest that spidroin is more advantageous for tissue engineering and therapy than fibroin.
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12
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The Change in the Linear Energy Transfer of a Clinical Proton Beam in the Presence of Gold Nanoparticles. Biophysics (Nagoya-shi) 2020. [DOI: 10.1134/s0006350920040053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Metal-derived nanoparticles in tumor theranostics: Potential and limitations. J Inorg Biochem 2020; 209:111117. [PMID: 32473483 DOI: 10.1016/j.jinorgbio.2020.111117] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 05/14/2020] [Accepted: 05/14/2020] [Indexed: 12/19/2022]
Abstract
Initially, metal derived nanoparticles have been used exclusively as contrasting agents in magnetic resonance imaging. Today, green routes of chemical synthesis together with numerous modifications of the core and surface gave rise to a plethora of biomedical applications of metal derived nanoparticles including tumor imaging, diagnostics, and therapy. These materials are an emerging class of tools for tumor theranostics. Nevertheless, the spectrum of clinically approved metal nanoparticles remains narrow, as the safety, specificity and efficiency still have to be improved. In this review we summarize the major directions for development and biomedical applications of metal based nanoparticles and analyze their effects on tumor cells and microenvironment. We discuss the advantages and possible limitations of metal nanoparticle-based tumor theranostics, as well as the potential strategies to improve the in vivo performance of these unique materials.
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15
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Furodihydroquinolines as Novel Photosensitizers for Photochemotherapy. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2020. [DOI: 10.1134/s199079311906023x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Genome Editing As an Approach to the Study of in Vivo Transcription Reprogramming. DOKL BIOCHEM BIOPHYS 2020; 490:43-46. [PMID: 32342312 DOI: 10.1134/s1607672920010147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 12/10/2019] [Accepted: 12/10/2019] [Indexed: 11/23/2022]
Abstract
CDK8-mediated transcriptional reprogramming is essential for an extensive gene expression. Constitutive knockouts of the cdk8 gene are lethal at the morula stage. For modeling transcriptional reprogramming in an adult organism, we investigated the possibility to attenuate the CDK8 kinase activity with a F97G mutation in exon 3 of the cdk8 gene. According to preliminary experimental data, this mutation should lead to a decrease in CDK8 kinase activity. To edit the genome of laboratory mice, the CRISPR/Cas9 technology was used, in which the introduction of a double-stranded gap occurred at a distance of 128 nucleotide pairs from the planned site of the introduced mutation. To introduce the mutation, a matrix for homologous repair was used as part of plasmid DNA, with homologous arms 903 and 484 bp in the 5'-3' region from the point of double-stranded rupture, respectively. As a result, mice with site-specific target mutations in exon 3 of the cdk8 gene were obtained. We for the first time demonstrated a high efficacy of the mutation 128 bp apart from the site of double-strand break. Viable animals with the F97G mutation in the catalytic domain of CDK8 kinase were obtained for the first time. The resulting cdk8 mutant mice will be used in subsequent studies to simulate the processes involving transcription reprogramming.
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A Unique Prototypic Device for Radiation Therapy: The p53-Independent Antiproliferative Effect of Neutron Radiation. Acta Naturae 2019; 11:99-102. [PMID: 31720022 PMCID: PMC6826147 DOI: 10.32607/20758251-2019-11-3-99-102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Radiation therapy with heavy particles including neutrons, an otherwise
therapeutically perspective because of its high tissue penetration and
efficient tumor damage, is currently limited by the lack of adequate equipment.
An NG-24 generator (140 kg, 42 × 110 cm, ~1011 particles/s, > 14 MeV)
has been designed and engineered to replace the huge and environmentally
harmful neutron reactors, cyclotrons, and accelerators with a compact,
portable, safe, and potent source of high-energy neutrons. We demonstrate that
the neutron beam produced by NG-24 causes a significant antiproliferative
effect on human tumor cell lines regardless of the status of the anti-apoptotic
p53 protein. Phosphorylation of histone 2A and increased amounts of p21, cyclin
D, and phospho-p53 were detectable in HCT116 colon carcinoma cells (wild-type
p53) irradiated with 4 Gy several days post-treatment, accompanied by G2/M
phase arrest. These treatments dramatically reduced the ability of single cells
to form colonies. In the HCT116p53KO subline (p53 -/-), the G2/M arrest was
independent of the aforementioned mechanisms. Hence, the NG-24 generator is a
source of a powerful, therapeutically relevant neutron flux that triggers a
p53-independent antiproliferative response in tumor cells.
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18
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The Effect of Gold Nanoparticle Surface Modification with Polyethylene Glycol on the Absorbed Dose Distribution upon Irradiation with 137Cs and 60Co Photons. Biophysics (Nagoya-shi) 2019. [DOI: 10.1134/s0006350919010032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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19
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The antioxidant 2,6-di-tert-butylphenol moiety attenuates the pro-oxidant properties of the auranofin analogue. Metallomics 2018; 10:406-413. [PMID: 29399682 DOI: 10.1039/c7mt00286f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal-based drugs are gaining momentum as a rapidly developing area of medicinal inorganic chemistry. Among gold pharmaceuticals, auranofin is a well known antirheumatic drug. The efficacy of gold-organic complexes largely depends on their pro-oxidant properties since auranofin targets the redox enzyme thioredoxin reductase (TrxR). However, an uncontrollable oxygen burst may be harmful for healthy cells; therefore, the search for chemical modifications to attenuate oxidation-related general toxicity of gold containing anti-inflammatory drugs is justified. In this study, we demonstrate that the incorporation of a specific antioxidant phenol fragment can counterbalance the pro-oxidative potential of the Au containing complex molecule. The electrochemical studies of AuPPh3SR (1, R= 3,5-di-tert-butyl-4-hydroxyphenyl) and its precursors AuPPh3Cl (2) and RSH (3) showed that complex 1 and phenol 3 efficiently scavenged the radicals (as detected by cyclic voltammetry) whereas 2 had no effect. Compound 1 inhibited TrxR in vitro with IC50 0.57 ± 0.15 μM, a value one order of magnitude bigger than the potency reported for auranofin. Compound 1 (5 mg kg-1 daily gavage for 14 days) caused a decrease in ex vivo spontaneous and ascorbate-induced lipid peroxidation in the homogenates of rat lung, heart muscle, spleen, liver, kidneys, testicles and brain as assessed by the thiobarbituric acid reactive substances. Importantly, in animals fed with 1, no discernible general toxicity was registered suggesting that this compound is well tolerated. Our results provide evidence for an efficient synthetic route to obtain gold containing anti-inflammatory drug candidates with balanced pro/anti-oxidative properties.
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Cytotoxic Chlorin e6 Derivatives with One or Two 4,5-Dichloro-1,2-thiazole Fragments. MACROHETEROCYCLES 2018. [DOI: 10.6060/mhc170726b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Abstract
The modified asparaginase Was79 was derived from the recombinant wild-type L-asparaginase of Wolinella succinogenes. The Was79 contains the amino acid substitutions V23Q and K24T responsible for the resistance to trypsinolysis and the N-terminal heparin-binding peptide KRKKKGKGLGKKR responsible for the binding to heparin and tumor K562 cells in vitro. When tested on a mouse model of Fischer lymphadenosis L5178Y, therapeutic efficacy of Was79 was significantly higher than that of reference enzymes at all single therapeutic doses used (125-8000 IU/kg). At Was79 single doses of 500-8000 IU/kg, the complete remission rate of 100 % was observed. The Was79 variant can be expressed intracellularly in E. coli as a less immunogenic formyl-methionine-free form at high per cell production levels.
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23
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Synthesis of new carbohydrate-containing cationic alkyl glycerolipids with antitumor activity. Russ Chem Bull 2015. [DOI: 10.1007/s11172-015-1055-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Synthesis and antitumor activity of novel tetrakis[4-(closo-carboranylthio)tetrafluorophenyl]porphyrins. Russ Chem Bull 2015. [DOI: 10.1007/s11172-014-0751-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Antitumor phosphate-containing lipids and non-phosphorus alkyl cationic glycerolipids: chemical structures and perspectives of drug development. Russ Chem Bull 2015. [DOI: 10.1007/s11172-014-0552-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Interaction with serum albumin as a factor of the photodynamic efficacy of novel bacteriopurpurinimide derivatives. Acta Naturae 2015; 7:109-16. [PMID: 25927008 PMCID: PMC4410402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Optimization of the chemical structure of antitumor photosensitizers (PSs) is aimed at increasing their affinity to a transport protein, albumin and irreversible light-induced tumor cell damage. Bacteriopurpurinimide derivatives are promising PSs thanks to their ability to absorb light in the near infrared spectral region. Using spectrophotometry, we show that two new bacteriopurpurinimide derivatives with different substituents at the N atoms of the imide exocycle and the pyrrole ring A are capable of forming non-covalent complexes with human serum albumin (HSA). The association constant (calculated with the Benesi-Hildebrand equation) for N-ethoxybacteriopurpurinimide ethyloxime (compound 1) is higher than that for the methyl ether of methoxybacteriopurpurinimide (compound 2) (1.18×10(5) M-1 vs. 1.26×10(4) M(-1), respectively). Molecular modeling provides details of the atomic interactions between 1 and 2 and amino acid residues in the FA1 binding site of HSA. The ethoxy group stabilizes the position of 1 within this site due to hydrophobic interaction with the protein. The higher affinity of 1 for HSA makes this compound more potent than 2 in photodynamic therapy for cultured human colon carcinoma cells. Photoactivation of 1 and 2 in cells induces rapid (within a few minutes of irradiation) necrosis. This mechanism of cell death may be efficient for eliminating tumors resistant to other therapies.
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Novel derivatives of bacteriochlorophyll a: complex formation with albumin and the mechanism of tumor cell photodamage. DOKL BIOCHEM BIOPHYS 2014; 454:17-20. [PMID: 24633606 DOI: 10.1134/s1607672914010062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Indexed: 11/23/2022]
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28
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Topoisomerase I and II inhibitors: chemical structure, mechanisms of action and role in cancer chemotherapy. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n01abeh004363] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
We studied the cytotoxicity of acadesine (5-aminoimidazole-4-carboxamide-1--D-ribofuranoside) for tumor and normal cells of various species and tissue origin. In tumor cells, acadesine triggered non-apoptotic death; the potency of the compound to normal cells was substantially lower. Acadesine was toxic for tumor cells with multidrug resistant phenotypes caused by the transmembrane transporter Р-glycoprotein or lack of proapoptotic p53. Activity of adenosine receptors was required for acadesine-induced cell death, whereas functioning of АМР-dependent protein kinase was not required. A more pronounced cytotoxicity for tumor cells, as well as the non-canonical death mechanism(s), makes acadesine a promising candidate for antitumor therapy.
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Acadesine Triggers Non-apoptotic Death in Tumor Cells. Acta Naturae 2013; 5:74-8. [PMID: 24303202 PMCID: PMC3848068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
We studied the cytotoxicity of acadesine (5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside) for tumor and normal cells of various species and tissue origin. In tumor cells, acadesine triggered non-apoptotic death; the potency of the compound to normal cells was substantially lower. Acadesine was toxic for tumor cells with multidrug resistant phenotypes caused by the transmembrane transporter Р-glycoprotein or lack of proapoptotic p53. Activity of adenosine receptors was required for acadesine-induced cell death, whereas functioning of АМР-dependent protein kinase was not required. A more pronounced cytotoxicity for tumor cells, as well as the non-canonical death mechanism(s), makes acadesine a promising candidate for antitumor therapy.
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31
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Complexes of antiparallel telomeric G-quadruplex d(TTAGGG)4 with carboxymethyl tetracationic porphyrins. Mol Biol 2013. [DOI: 10.1134/s0026893313030047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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[The natural triterpenoid miliacin prevents methotrexate-induced oxidative stress and normalizes the expression of genes encoding the cytochrome P-450 2E1 isoform and glutathione reductase in the liver]. PATOLOGICHESKAIA FIZIOLOGIIA I EKSPERIMENTAL'NAIA TERAPIIA 2013:70-74. [PMID: 23805719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We studied the role of the natural triterpenoid miliacin (3-3-methoxy-Al8-oleanene) in the regulation of oxidative stress in the liver of (CBAxC57B1(6))F1 mice exposed to methotrexate. Miliacin attenuated methotrexate-induced lipid peroxidation as determined by an attenuation of thiobarbituric acid-reacting products in the liver. Furthermore, miliacin normalized the expression of genes encoding the 2e1 isoform of cytochrome P-450 and glutathione reductase that were dramatically dysregulated by methotrexate. These results established the role of miliacin in modulation of redox genes, thereby providing evidence for a new mechanism of organ protection by this triterpenoid.
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Characteristics of complex formation between monomeric and dimeric bisbenzimidazoles and AT-containing polynucleotide. Mol Biol 2012. [DOI: 10.1134/s0026893312060131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Identification of phosphorylation sites in aminoglycoside phosphotransferase VIII from Streptomyces rimosus. BIOCHEMISTRY (MOSCOW) 2012; 77:1258-65. [DOI: 10.1134/s0006297912110041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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35
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Complex formation of Zn-, Ni-, and Pd-derivatives of purpurin-18 with serum albumin. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2012. [DOI: 10.1134/s003602441211012x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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37
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Role of the medium acidity in the complex formation of pyropheophorbide a with albumin and lipoproteins. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2011; 37:718-20. [DOI: 10.1134/s1068162011050062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Structural basis for inhibition of human and bacterial uridine phosphorylases by 2,2′-anhydrouridine, a modulator of 5-fluorouracil activity. Acta Crystallogr A 2011. [DOI: 10.1107/s010876731109266x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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40
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Altered transcription and replication are the mechanisms of cytotoxicity of antitumor antibiotic olivomycin A. DOKL BIOCHEM BIOPHYS 2010; 435:320-2. [DOI: 10.1134/s1607672910060104] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Indexed: 11/23/2022]
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41
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Studies of complex formation of olivomycin A and its derivatives with DNA. DOKL BIOCHEM BIOPHYS 2010; 435:334-8. [DOI: 10.1134/s1607672910060141] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Indexed: 11/23/2022]
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Fighting Tumor Cell Survival: Advances in the Design and Evaluation of Pim Inhibitors. Curr Med Chem 2010; 17:4114-33. [DOI: 10.2174/092986710793348554] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Accepted: 10/07/2010] [Indexed: 11/22/2022]
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5,10,15,20-Tetra-(N-methyl-3-pyridyl)porphyrin destabilizes the antiparallel telomeric quadruplex d(TTAGGG)4. Mol Biol 2010. [DOI: 10.1134/s0026893310050201] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Crystallization and preliminary X-ray diffraction analysis of Salmonella typhimurium uridine phosphorylase complexed with 5-fluorouracil. Acta Crystallogr Sect F Struct Biol Cryst Commun 2009; 65:601-3. [PMID: 19478441 DOI: 10.1107/s1744309109016133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Accepted: 04/29/2009] [Indexed: 11/10/2022]
Abstract
Uridine phosphorylase (UPh; EC 2.4.2.3) catalyzes the phosphorolytic cleavage of the N-glycosidic bond of uridine to form ribose 1-phosphate and uracil. This enzyme also activates pyrimidine-containing drugs, including 5-fluorouracil (5-FU). In order to better understand the mechanism of the enzyme-drug interaction, the complex of Salmonella typhimurium UPh with 5-FU was cocrystallized using the hanging-drop vapour-diffusion method at 294 K. X-ray diffraction data were collected to 2.2 A resolution. Analysis of these data revealed that the crystal belonged to space group C2, with unit-cell parameters a = 158.26, b = 93.04, c = 149.87 A, alpha = gamma = 90, beta = 90.65 degrees . The solvent content was 45.85% assuming the presence of six hexameric molecules of the complex in the unit cell.
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Morphological manifestations for the protective effect of miliacin in organs of immunogenesis after treatment with methotrexate. Bull Exp Biol Med 2008; 144:575-9. [PMID: 18642717 DOI: 10.1007/s10517-007-0381-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Morphological changes in lymphoid organs induced by antitumor drug methotrexate were studied in 219 male (CBAxC57B1/6)F1 mice. Plant triterpenoid miliacin attenuated the lymphotoxic effect of this drug.
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Abstract
This review focuses on the synthesis and mechanisms of antitumor activity of cationic non-phosphorus analogs of edelfosine. The role of variable length and mode of conjugation of the spacer group, the types of cationic 'head', and the length of the substituent at C2 atom of the glycerol backbone are discussed, providing the basis for rational design of lipophilic anticancer drugs, in particular, for elimination of multidrug resistant cells.
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The role of beta1 integrin subfamily in anchorage-dependent apoptosis of breast carcinoma cells differing in multidrug resistance. BIOCHEMISTRY (MOSCOW) 2006; 71:489-95. [PMID: 16732726 DOI: 10.1134/s000629790605004x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Integrin expression was investigated in MCF-7 human breast adenocarcinoma line and in the MCF-7Dox line, which was selected from MCF-7 by a resistance to multiple antitumor drugs (MDR). We have shown that acquisition of MDR was accompanied by a drastically reduced expression of some integrins of the beta1-subfamily (alpha2beta1, alpha3beta1, alpha6beta1) and of alpha vbeta5 intergin in the adenocarcinoma cells. In contrast, expression of alpha5beta1 integrin was markedly increased in the MDR cells. Along with multiple antitumor drug resistance, MCF-7Dox cells demonstrate elevated resistance to anchorage-dependent apoptosis (anoikis) and enhanced in vitro invasive activity. To elucidate the implication of beta1-integrins in the above phenotypic modifications, the effect of beta1-integrin signaling was assayed. Stimulation of beta1-mediated signaling was accomplished by treating of the cells with antibodies to the beta1-subunit common for members of the beta1-subfamily. These data show that activation of beta1-integrin signaling markedly upregulated anoikis of the adenocarcinoma cells.
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Mechanisms of apoptosis are retained in cells with P glycoprotein-mediated drug resistance. DOKLADY BIOLOGICAL SCIENCES : PROCEEDINGS OF THE ACADEMY OF SCIENCES OF THE USSR, BIOLOGICAL SCIENCES SECTIONS 2006; 407:187-91. [PMID: 16739490 DOI: 10.1134/s0012496606020219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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