Evaluating The Therapeutic Efficacy of Grb2 Inhibition In Ovarian Malignancies

<p><strong>Purpose: </strong>Adaptor proteins such as growth factor receptor-bound protein-2 (Grb2) play important roles in cancer cell signaling. In the present study, we examined the biological effects of liposomal antisense oligodeoxynucleotide that blocks Grb2 expression (L-Grb2) in ovarian cancer models.</p> <p><strong>Experimental Design: </strong>Murine orthotopic models of ovarian cancer (OVCAR5 and SKOV3ip1) were used to study the biological effects of L-Grb2 on tumor growth. <em>In vitro</em> experiments (cell viability assay, Western blot analysis, siRNA transfection, and reverse phase protein array) were carried out to elucidate the mechanism and potential predictors of tumor response to L-Grb2.</p> <p><strong>Results: </strong>Treatment with L-Grb2 decreased tumor growth and metastasis in orthotopic models of ovarian cancer (OVCAR5, SKOV3ip1) by reducing angiogenesis and increasing apoptosis at a dose of 15 mg/kg with no effect on mouse body weight. Treatment with L-Grb2 and paclitaxel led to the greatest decrease in tumor weight (mean± SEM, 0.17 g ± 0.10 g) compared with that in control mice (0.99 g ± 0.35 g). We also observed a reduction in tumor burden after treatment with L-Grb2 and the anti-VEGF antibody B-20 (86% decrease in tumor weight compared with that in controls). Ovarian cancer cells with ErbB2 amplification (OVCAR8 and SKOV3ip1) were the most sensitive to Grb2 downregulation. Reverse phase protein array analysis identified significant dysregulation of metabolites (LDHA, GAPDH, and TCA intermediates) in ovarian cancer cells<strong> </strong>after Grb2 downregulation.</p> <p><strong>Conclusions:</strong> L-Grb2 has therapeutic efficacy in preclinical models of ovarian cancer. These findings support he clinical development of L-Grb2 for treatment of cancer.</p>

Name thesis:degree_name

Masters of Science (MS)

Level thesis:degree_level

Thesis (MS)

Year dc:date.available

2019

Authors dc:creator

• Lara, Olivia
• <p>https://orcid.org/0000-0002-3540-5804</p>

Contributors dc:contributor

• Anil Sood
• Funda Meric-Bernstam
• Cristian Rodriguez-Aguayo

• Nucleic acid based therapeutics
• Ovarian carcinoma
• small molecular inhibitors
• targeted therapy
• Medical Sciences
• Medicine and Health Sciences
• Nucleic Acids, Nucleotides, and Nucleosides
• Oncology
• Therapeutics

Repository record dc:identifier

https://digitalcommons.library.tmc.edu/utgsbs_dissertations/957

OAI identifier oai:identifier

oai:digitalcommons.library.tmc.edu:utgsbs_dissertations-2004