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EVALUATION OF A SMALL MOLECULE AGONIST OF EPHA2 RECEPTOR TYROSINE KINASE AND COPALIC ACID ANALOGS AS PROSTATE CANCER THERAPEUTICS

Idippily, Nethrie
http://rave.ohiolink.edu/etdc/view?acc_num=csu1525722508418914

Abstract Details

2018, Doctor of Philosophy in Clinical-Bioanalytical Chemistry, Cleveland State University, College of Sciences and Health Professions.
Project I: Chemotherapeutic drugs have many side effects that are undesirable and are highly toxic. Therefore, there is a growing need for the development of drugs with enhanced efficacy, specificity, and potency to provide cancer patients with a better prognosis. It was discovered that a member of the Receptor Tyrosine Kinase family, EphA2, may prove to be a viable target in developing anti-cancer agents. In the presence of its ligand, EphA2 receptor is responsible for apoptotic and anti-migratory activity. However, in the absence of ligand, EphA2 is able to stimulate cell migration and therefore tumorigenic activity. These conflicting roles of EphA2 and the upregulation of this receptor that is seen in many cancers have provided a novel strategy in designing therapeutic agents. Therefore, small molecules can be used to stimulate ligand-dependent pathways of EphA2 that induce anti-migratory and anti-proliferative effects in cancer cells in order to inhibit metastasis and tumor progression. A small molecule, doxazosin, was identified as an EphA2 agonist in a recent study. It demonstrated positive results in that its actions were similar to those of the natural ligand. Subsequently, a library of compounds was generated using doxazosin as the lead compound in order to improve its activity. These compounds were tested for their activity in stimulating EphA2 receptor. Two of them showed improved activity compared to doxazosin while mimicking a mechanism similar to the native ligand. The structure activity relationship of these derivatives, the in vitro mechanisms and pharmacokinetic profiles were also analyzed, which provides a basis for further optimization and subsequent in vivo studies of these compounds in the future. Project II: Copalic acid which is one of the diterpenoid acids in copaiba oil inhibited the chaperone function of ¿-crystallin and heat shock protein 27 kDa (HSP27). It also showed potent activity in decreasing the level of an HSP27 client protein, androgen receptor (AR), which makes it useful in prostate cancer treatment. In order to develop potent drug candidates to decrease the AR level in prostate cancer cells, copalic acid analogs were synthesized. Using AR level as a readout 15 copalic acid analogs were screened, which showed that two of those compounds were much more potent than copalic acid. They inhibited AR positive prostate cancer cell growth in a dose-dependent manner. Furthermore, they also inhibited the chaperone activity of a-crystallin.
Bin Su, Ph.D. (Advisor)
Aimin Zhou, Ph.D. (Committee Member)
Yan Xu, Ph.D. (Committee Member)
Yana Sandlers, Ph.D (Committee Member)
Andrew Resnick, Ph.D. (Committee Member)
Analytical Chemistry; Biochemistry; Biology; Biomedical Research; Organic Chemistry; Pharmacology

Recommended Citations

Citations

  • Idippily, N. (2018). EVALUATION OF A SMALL MOLECULE AGONIST OF EPHA2 RECEPTOR TYROSINE KINASE AND COPALIC ACID ANALOGS AS PROSTATE CANCER THERAPEUTICS [Doctoral dissertation, Cleveland State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=csu1525722508418914

    APA Style (7th edition)

  • Idippily, Nethrie. EVALUATION OF A SMALL MOLECULE AGONIST OF EPHA2 RECEPTOR TYROSINE KINASE AND COPALIC ACID ANALOGS AS PROSTATE CANCER THERAPEUTICS . 2018. Cleveland State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=csu1525722508418914.

    MLA Style (8th edition)

  • Idippily, Nethrie. "EVALUATION OF A SMALL MOLECULE AGONIST OF EPHA2 RECEPTOR TYROSINE KINASE AND COPALIC ACID ANALOGS AS PROSTATE CANCER THERAPEUTICS ." Doctoral dissertation, Cleveland State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1525722508418914

    Chicago Manual of Style (17th edition)

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