Roshni Iyer

Graduation Semester and Year

2018

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Biomedical Engineering

Department

Bioengineering

First Advisor

Kytai T Nguyen

Second Advisor

Yi Hong

Abstract

Despite extensive research and progress in anti-cancer therapeutics, an effective treatment for non-small cell lung cancer (NSCLC) remains elusive, resulting in poor 5-year patient survival rate. Towards this end, we have explored a therapeutic regimen to improve the effects of local concurrent chemo-radiation-therapy (CRT), by utilizing multifunctional stimuli-responsive nanoparticles (NPs) as drug carriers. We have also utilized lung cancer targeting strategies for site-specific drug delivery, mainly antibodies against the Ephrin-transmembrane receptor kinase (EphA2), that is over-expressed mainly on lung cancer cells, to promote the targeted delivery of drugs to only cancer cells, and eventually reduce the toxicity to healthy tissues. The overall goal of these NPs is to provide a triggered release of potent radiosensitizers (NU7441) upon exposure to radiation, followed by release of chemotherapeutic agents (cisplatin) in response to elevated glutathione levels in the lung cancer cells, to facilitate enhanced spatio-temporal drug release in the lung tumor environment for CRT. This design-driven research has been approached in three specific aims, each exploring the physico-chemical properties of the NPs and their in vitro and in vivo therapeutic efficacies and biodistribution; Aim 1: Cisplatin-loaded glutathione (GSH)-responsive nanoparticles (GNPs) for lung cancer chemotherapy, Aim 2: NU7441-loaded radiation (RT)-responsive NPs for lung cancer radiation therapy and Aim 3: Multifunctional dual drug-loaded, dual stimuli-responsive core-shell NPs (DSNPs) for CRT. Our results demonstrated the GSH- and radiation-responsive drug release characteristics of the NPs from Aim 1 and 2 respectively, the enhanced lung cancer cell targeting abilities of these NPs and finally their improved therapeutic efficacies compared to free drugs and untargeted NPs. Finally, a core-shell combination of these NPs observed synergistic drug release and therapeutic efficacies, concurrently with radiation therapy. These NPs could potentially be used to improve outcomes in patients with NSCLC when applying CRT to treat lung cancer.

Keywords

Nanoparticles, Stimuli-responsive, Glutathione, Radiation, Lung cancer, Cisplatin, NU7441

Disciplines

Biomedical Engineering and Bioengineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

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