Medical Molecular Biology Commons^™

Detection Of A Peptide Hormone - Somatostatin - Label-Free Split-Aptameric Probes, Charles A. Dowis

Honors Undergraduate Theses

Peptide hormones are important biomolecules that transduce downstream effects such as cell proliferation, regulation, and gene expression. Their levels have been upregulated in various disorders such as cancer, yet detection methods are lacking. We designed two split aptamer-based assays for the detection of a peptide hormone – Somatostatin (SST) – with different signal readouts: fluorescent readout based on light-up aptamers and the colorimetric readout of ABTS peroxidation from a G-quadruplex. We used an already selected split-aptamer –SSTA5–for SST for our designs and we had expected the developed detection systems to exhibit detection and quantification capabilities that would hopefully allow their …

The Role Of Frabin (Fgd4) In Aggressive Prostate Cancer, Alexia M. Bossan

Honors Undergraduate Theses

A major problem in prostate cancer (PCa) management is the development of drug resistance. It is known that there are changes in PCa biology upon prolonged treatment with drugs, including anti-androgen drugs that alter cellular signaling processes leading to the development of castration resistant PCa. MicroRNAs (miRNAs) are regulatory molecules that modulate gene expression through inhibition of protein translation and modulate cellular functions. Altered expression of miRNAs is often noted in drug resistant cancer including PCa. Studies from our laboratory have identified a number of down-regulated miRNAs in PCa, including miR-l 7-92a miRNAs. Frabin (FGD4) is a target of the …

An Rnai Screen To Identify Components Of A Polyamine Transport System, Adam J. Foley

Honors Undergraduate Theses

Polyamines, specifically putrescine, spermidine, and spermine, are small cationic molecules found in all organisms. Cells can biosynthetically make these molecules, or alternatively, they can be transported from the extracellular environment. Malignant cells have been shown to require relatively high amounts of polyamines. There is a chemotherapeutic agent, DFMO, used to block the biosynthesis of polyamines. Many malignant cells can circumvent DFMO therapy by activating their transport system. A potential solution is to simultaneously block biosynthesis and transport of polyamines. However, little is known about the polyamine transport system in higher eukaryotes.

This thesis aims to add to the basic biological …

Validating Drug Targets Through Inhibition Of Protein-Protein Interactions In Mycobacterium Tuberculosis, Erin C. Driscoll

Honors Undergraduate Theses

Tuberculosis is the leading cause of death by single infectious disease worldwide; novel antibiotics are needed to continue to treat this disease. To goal of this project is to provide proof-of-principle support for the idea that targeting protein-protein interactions (PPI) is an appropriate course for the discovery of new drugs. This study optimized the M-PFC assay, which allows detection of PPI in Mycobacteria, through the use of stronger promoters and inducible expression of a peptide blocker by riboswitch. To accomplish this, promoter induction studies were used to find stronger promoters for the M-PFC, optimization of the riboswitch as a …

Expression Levels Of Virulence Genes In Group A Streptococci: A Response To Aerosolized Propylene Glycol, Michael S. Costello

Honors Undergraduate Theses

Electronic cigarette usage is becoming increasingly prevalent among school age children and young adults. A known bactericidal agent, propylene glycol, is often used as a carrier for nicotine, flavoring, and additional constituents of electronic cigarette juice. This study examined the relationship between propylene glycol and virulence gene expression in Streptococcus pyogenes, a respiratory tract pathogen commonly found in school-age individuals. A variety of virulence genes controlled by the three stand alone regulators mga, RofA, and Rgg/RopB were sampled in an effort to understand the pathway by which virulence is affected. The genes chosen encode C5a peptidase, fibronectin binding protein, hyaluronate …