Home > Medicine & Health Science textbooks > Medicine: general issues > Therapeutic Targets of Arsenic Trioxide in Lymphoma Treatment: (English)
Therapeutic Targets of Arsenic Trioxide in Lymphoma Treatment: (English)

Therapeutic Targets of Arsenic Trioxide in Lymphoma Treatment: (English)

          
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About the Book

This dissertation, "Therapeutic Targets of Arsenic Trioxide in Lymphoma Treatment" by Lok-man, Yue, 庾樂民, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Lymphomas are malignant diseases involving the lymphatic system. Arsenic trioxide (As2O3) is a current therapeutic agent for acute promyelocytic leukaemia (APL).APL cells are sensitive to As2O3, with As2O3directly targeting the PML-RARA protein that plays an important role in the oncogenesis of APL. In order to discover the potential of As2O3as a treatment of lymphoma, understanding of the molecular mechanism of As2O3in human lymphoma cells is essential. In this thesis, we showed that the MYC gene is a therapeutic target for As2O3in B-cell lymphomas and the CCND1 (cyclin D1) gene is another therapeutic target for As2O3in mantle cell lymphoma (MCL), a subtype of non-Hodgkin lymphoma (NHL). Both real-time RT-PCR and immunoblotting analysis showed that the expression levels of MYC in all B-cell lymphoma cell lines were down-regulated at both mRNA and protein level after As2O3treatment. The expression levels of MYC were also found to positively correlate with the arsenic sensitivity as measured by MTT assay. Hence, the higher the level of MYC expression, the higher the arsenic sensitivity of human B-cell lymphoma cell lines. Besides, the change of downstream genes after modulation of MYC expression level by As2O3 treatment was investigated. The expression level of CDKN1A and CDKN1B was increased after As2O3 treatment. Interestingly, the growth rate of MYC over-expressing lymphoma cell lines decreased significantly after As2O3treatment, while there was no significant decrease in colony formation assay in lymphoma cells without MYC over-expression. Immunoblotting analysis showed that As2O3could degrade the cyclin D1 protein in mantle cell lymphoma cell lines in a dose-dependent manner. Real-time RT-PCR analysis also showed that the mRNA level of CCND1gene was decreased after As2O3treatment. We also demonstrated that As2O3-induced cyclin D1 protein degradation was related to the proteasome pathway. The growth rate of MCL cell line decreased significantly after As2O3treatmentby using colony formation assay. Human water channel protein, aquaporin 9 (AQP9) has been demonstrated to facilitate the arsenic uptake in human leukaemia cells. In this thesis, we showed that the expression levels of AQP9were found to positively correlate with the arsenic sensitivity as measured by MTT assay in B-cell lymphoma cells. We also demonstrated that dexamethasone could up-regulate AQP9expressions at both mRNA and protein levels in human B-cell lymphoma cell lines. These results not only suggest that As2O3is a potential therapy for B-cell lymphomas, especially for those MYC-over-expressed B-cell lymphomas and MCL, but also indicate that MYC may act as a biomarker for predicting the clinical behaviour of B-cell lymphoma patients to the As2O3treatment.Moreover, dexamethasone pre-treatment may enhance the therapeutic effect of As2O3by up-regulating AQP9expression in B-cell lymphomas. DOI: 10.5353/th_b5194770 Subjects: Arsenic compounds Lymphomas - Treatment


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Product Details
  • ISBN-13: 9781361340790
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 136
  • Spine Width: 10 mm
  • Width: 216 mm
  • ISBN-10: 1361340797
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Series Title: English
  • Weight: 612 gr


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