Title page for ETD etd-10022015-090213

Type of Document Master's Thesis
Author Babahosseini, Hesam
Author's Email Address hbabahosseini@vt.edu
URN etd-10022015-090213
Title Nanoparticle-Based Drug Delivery and the Impacts on Cancer Cell Biophysical Markers
Degree Master of Science
Department Biological Systems Engineering
Advisory Committee
Advisor Name Title
Chenming (Mike) Zhang Committee Chair
Masoud Agah Committee Co-Chair
Webster Santos Committee Member
  • MicroElectroMechanical Systems (MEMS)
  • Microfluidics
  • Biosensor
  • Nanoparticles
  • Drug Delivery
  • Biomechanics
  • Bioelectronics
  • Breast Cancer
  • MDA-MB-231
  • Sphingosine Kinase Inhibitors
Date of Defense 2015-09-25
Availability unrestricted
Cancer progression and physiological changes within the cells are accompanied by alterations in the biophysical properties. Therefore, the cell biophysical properties can serve as promising markers for cancer detection and physiological activities. To aid in the investigation of the biophysical markers of cells, a microfluidic chip has been developed which consists of a constriction channel and embedded microelectrodes. Single-cell impedance magnitudes at four frequencies and entry and travel times are measured simultaneously during their transit through the constriction channel. This microchip provides a high-throughput, label-free, automated assay to define biophysical signatures of malignant cells and monitor the therapeutic efficacy of drugs. Here, we monitored the dynamic cellular biophysical markers in response to sphingosine kinase inhibitors (SphKIs), and compared the effectiveness of drug delivery using Poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) loaded with SphKIs versus conventional delivery. Cells treated with SphKIs showed significantly higher impedance magnitudes at all four frequencies. The bioelectrical parameters extracted using a model also revealed that the highly aggressive breast cells treated with SphKIs shifted electrically towards that of a less malignant phenotype; SphKI-treated cells exhibited an increase in cell-channel interface resistance and a significant decrease in specific membrane capacitance. Furthermore, SphKI-treated cells became slightly more deformable as measured by a decrease in their channel entry and travel times. We observed no significant difference in the bioelectrical changes produced by SphKI delivered conventionally or with NPs. However, NPs-packaged delivery of SphKI decreased the cell deformability. In summary, the results showed that while the bioelectrical properties of the cells were dominantly affected by SphKIs, the biomechanical properties were mainly changed by the NPs.
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