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61.
Juliet R. Honeycombe 《Mutation research》1978,57(2):35-49
In vitro exposure of human lymphocytes to busulphan (BUS) produced an increase in chromosome aberrations and in sister-chromatid exchange (SCE) frequency. The distribution of chromosome breaks throughout the karyotype was non-random and they occurred mainly in the G-negative bands. Certain bands had a marked susceptibility to BUS and comparisons with the human chromosome-break distributions reported for a number of drugs revealed that some of these bands were equally susceptible to other alkylating agents. Both the number of chromosome gaps and breaks and the SCE frequency increased with BUS concentration, but only the SCE dose-response was a clearly defined linear relationship. Therefore a standard SCE dose-response curve was constructed for future comparison with the results of similar investigations of patients on BUS therapy. 相似文献
62.
The present study provides evidence to support that human platelets possess a 47 kDa dual functional molecule having thiol-oxidase activity as well as high affinity for the SRE sequence in the human genome. On the basis of these as well as earlier results, we propose that Receptor 'Ck' dependent regulation of this dual functional 47 kDa molecule may provide a mechanism for the maintenance of cellular cholesterol homeostasis. Further, this mechanism nay also explain the molecular basis of cholesterol-feedback lesion observed under premalignant conditions. 相似文献
63.
Himansu Kumar Utkarsh Raj Saurabh Gupta 《Journal of biomolecular structure & dynamics》2016,34(10):2171-2183
Aberrant and proliferative expression of the oncogene BCR-ABL in the bone marrow cells had been proven as the prime cause of chronic myeloid leukemia (CML). It has been established that tyrosine kinase domain of BCR-ABL protein is a potential therapeutic target for the treatment of CML. Imatinib is considered as a first-generation drug that can inhibit the enzymatic action by inhibiting the ATP binding with BCR-ABL protein. Later on, insensitivity of CML cells towards Imatinib has been observed may be due to mutation in tyrosine kinase domain of the ABL receptor. Subsequently, some other second-generation drugs have also been reported viz. Baustinib, Nilotinib, Dasatinib, Ponatinib, Bafetinib, etc., which can able to combat against mutated domain of ABL tyrosine kinase protein. By taking into account of bioavailability and resistance developed, there is an utmost need to find some more inhibitors for the mutated ABL tyrosine kinase protein. For virtual screening, a data-set has been generated by collecting the all available drug like natural compounds from ZINC and Drug Bank databases. Comparative docking analysis was also carried out on the active site of ABL tyrosine kinase receptor with reported reference inhibitors. Molecular dynamics simulation of the best screened interacting complex was done for 50 ns to validate the stability of the system. These selected inhibitors were further validated and analyzed through pharmacokinetics properties and series of ADMET parameters by in silico methods. Considering the above said parameters proposed molecules are concluded as potential leads for drug designing pipeline against CML. 相似文献
64.
The diversity of natural compounds is essential for their mechanism of action. The source, structures and structure activity relationship of natural compounds contributed to the development of new classes of chemotherapy agents for over 40?years. The availability of combinatorial chemistry and high-throughput screening has fueled the challenge to identify novel compounds that mimic nature's chemistry and to predict their macromolecular targets. Combining conventional and targeted therapies helped to successfully overcome drug resistance and prolong disease-free survival. Here, we aim to provide an overview of preclinical investigated natural compounds alone and in combination to further improve personalization of cancer treatment. 相似文献
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66.
Hypomethylation‐mediated H19 overexpression increases the risk of disease evolution through the association with BCR‐ABL transcript in chronic myeloid leukemia
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68.
Sylvie Rusakiewicz Alejandro Madrigal Paul Travers Anthony I. Dodi 《Cancer immunology, immunotherapy : CII》2009,58(9):1449-1457
The BCR/ABL p210 fusion protein has long been considered an ideal target antigen for the development of immunotherapeutic
strategies in chronic myeloid leukaemia (CML) due to its central role in malignant transformation and to its unique novel
amino acid sequence solely expressed in leukaemia cells. However, the feasibility to expand BCR-ABL-specific T cells remains
still controversial. Using BCR/ABL peptide/MHC tetramers, significantly higher frequencies of tetramer positive cells were
detected in the peripheral blood of HLA-A*0301 (mean 0.38%) and HLA-B*0801 (mean 0.28%) CML patients than in healthy donors
(P = 0.0025 and 0.0026, respectively). However, following stimulation with autologous peptide-pulsed DCs, BCR/ABL-specific T
cells were only expanded from some healthy donors, suggesting that CML patients may have a specific immune deficit with respect
to the BCR/ABL antigen.
Professor A. I. Dodi passed away recently.
This paper is an original contribution from the meeting which took place 28–29 May 2008 in Nottingham, UK, celebrating the
contribution of Prof. A. I. “Tony” Dodi (29 January 2008) to the EU project “Network for the identification and validation
of antigens and biomarkers in cancer and their application in clinical tumour immunology (ENACT)”. 相似文献
69.
Catherine L. Riley Morgan G. Mathieu Richard E. Clark Stephanie E. B. McArdle Robert C. Rees 《Cancer immunology, immunotherapy : CII》2009,58(9):1489-1499
In haematological cancers, malignant cells circulate in the blood and lymphatic system. This may make leukaemic cells easier
to target by immunotherapy than in other types of cancer. Various immunotherapy strategies have been trialled in several leukaemias
including chronic myeloid leukaemia (CML) and in general, these have been aimed at targeting tumour-associated antigens (TAA).
There are numerous TAA expressed by CML patients including WT1, proteinase 3, BCR-ABL and HAGE amongst others. The immunogenicity
of the CML-specific tumour antigen, BCR-ABL, has been the subject of much debate and its role in the development of the disease
and its unique sequence spanning the breakpoint region make it an ideal target for immunotherapy. However, there are a limited
number of immunogenic epitopes across the junctional region, which are restricted to only a few HLA types, namely A2, A3 and
B7 (Clark et al. in Blood 98:2887–2893, 2001). The second CML-associated antigen is the helicase antigen HAGE, a cancer-testis antigen found to be over-expressed in more
than 50% of myeloid leukaemias (Adams et al. in Leukaemia 16:2238–2242, 2002). Very little is known about the function of this antigen and its significance to CML. However, its membership of the DEAD-box
family of ATP-dependent RNA helicases and the involvement of other members of this family in tumour cell proliferation (Eberle
et al. in Br J Cancer 86:1957–1962, 2002; Yang et al. in Cell Signal 17:1495–504, 2005) suggest a crucial role in the RNA metabolism of tumour cells. For these reasons, HAGE also seems to be a good target for
immunotherapy as it would be applicable for the majority of patients with CML. This review aims to discuss the potential of
immunotherapy for the treatment of leukaemia, in particular CML, and the prospect of targeting three CML associated antigens:
BCR, ABL and HAGE. During his career, Prof. Tony Dodi made a significant contribution in this area of leukaemia research,
confirming the identity of immunogenic HLA-A3 and B7-restricted peptides as targets for CTL. Published, as a highlighted paper
in Clark et al. (Blood 98:2887–2893, 2001), this study demonstrated the expression of MHC-peptide complexes on the surface of CML cells and the presence of tetramer-positive
CTL activity in CML patients positive for these two HLA alleles. His drive and dedication for research excellence will be
remembered by all who knew and worked with him.
C. L. Riley and M. G. Mathieu are joint first authors and have contributed equally to this paper.
This paper is a Focussed Research Review from the meeting which took place 28–29 May 2008 in Nottingham, UK, celebrating the
contribution of Prof. I. A. “Tony” Dodi (+29.1.2008) to the EU project “Network for the identification and validation of antigens
and biomarkers in cancer and their application in clinical tumour immunology (ENACT)”.
This review is dedicated to Prof. Tony Dodi (who passed away suddenly on 29 January 2008) and is written by colleagues who
worked with him on research collaborations for more than 10 years. The paper deals with an area of research that Tony dedicated
his working life to, that of leukaemia and immunotherapy. His contribution to this research was immense and he will be remembered
for his drive, enthusiasm and passion for research excellence, which was infectious. Catherine Riley was Tony’s graduate student
who successfully completed her doctorate degree, owing much to his wise direction and advice. 相似文献
70.
Srabanti Rakshit Jayashree Bagchi Labanya Mandal Kausik Paul Dipyaman Ganguly Sandip Bhattacharjee Monidipa Ghosh Nabendu Biswas Utpal Chaudhuri Santu Bandyopadhyay 《Apoptosis : an international journal on programmed cell death》2009,14(3):298-308
Introduction Imatinib, a small-molecule inhibitor of the Bcr-Abl kinase, is a successful drug for treating chronic myeloid leukemia (CML).
Bcr-Abl kinase stimulates the production of H2O2, which in turn activates Abl kinase. We therefore evaluated whether N-acetyl cysteine (NAC), a ROS scavenger improves imatinib efficacy.
Materials and methods Effects of imatinib and NAC either alone or in combination were assessed on Bcr-Abl+ cells to measure apoptosis. Role of nitric oxide (NO) in NAC-induced enhanced cytotoxicity was assessed using pharmacological
inhibitors and siRNAs of nitric oxide synthase isoforms. We report that imatinib-induced apoptosis of imatinib-resistant and
imatinib-sensitive Bcr-Abl+ CML cell lines and primary cells from CML patients is significantly enhanced by co-treatment with NAC compared to imatinib
treatment alone. In contrast, another ROS scavenger glutathione reversed imatinib-mediated killing. NAC-mediated enhanced
killing correlated with cleavage of caspases, PARP and up-regulation and down regulation of pro- and anti-apoptotic family
of proteins, respectively. Co-treatment with NAC leads to enhanced production of nitric oxide (NO) by endothelial nitric oxide
synthase (eNOS). Involvement of eNOS dependent NO in NAC-mediated enhancement of imatinib-induced cell death was confirmed
by nitric oxide synthase (NOS) specific pharmacological inhibitors and siRNAs. Indeed, NO donor sodium nitroprusside (SNP)
also enhanced imatinib-mediated apoptosis of Bcr-Abl+ cells.
Conclusion NAC enhances imatinib-induced apoptosis of Bcr-Abl+ cells by endothelial nitric oxide synthase-mediated production of nitric oxide. 相似文献