| Digital Archive


Search DSpace

Targeting the Sodium Iodide Symporter for In Vivo Detection and Characterization of Mammary Tumors in the Murine Model Using a Novel Gamma Camera

Show full item record

Author: Blue, Randall Eric
Advisor: Bradley, Eric L.
Committee Members: Saha, Margaret Somosi; Zwollo, Patty
Issued Date: 2009-07-22
Subjects: Sodium Iodide Symporter (NIS)
Gamma Camera
Mouse Mammary Tumor Virus (MMTV)
Breast Cancer
In Vivo Imaging
URI: http://hdl.handle.net/10288/1471
Description: Effective diagnosis and treatment of breast cancer rely on a precise and detailed understanding of the cellular-molecular alterations that give rise to an oncogenic phenotype. With the advent of new imaging technologies investigators have begun to follow mammary tumor development in vivo and noninvasively with high resolution and sensitivity. Continued progress requires combining molecular biology and imaging with the goal of imaging the metabolism of specific tumor-related molecules. As a result, we have developed a novel small animal gamma camera that is capable of detecting low levels (0.52 MBq, 14 uCi) of radioiodine (125^I). The dynamic uptake of radioiodine through the sodium iodide symporter (NIS) was used to detect the progression of spontaneous mammary tumors in the mouse mammary tumor virus (MMTV) model as well as the transgenic animal model expressing the polyoma middle T oncoprotein (PyVT). Based on whole mount immunohistochemistry, NIS protein expression correlates with the gamma camera images of radioiodine uptake, which is also a promising radiotracer for detecting small, non-palpable tumors (3 mm). Additionally, gamma imaging was capable of identifying PyVT mice from their wild type littermates based upon their ability to accumulate radioiodine in nulliparous mammary glands as early as 5 weeks of age. MMTV tumors are classified into three groups based on their unique radioiodine distribution that is correlated with tumor size, but not propagation rate. Differences in radioiodine uptake gain (or loss) are dynamic especially during early dose administration. Finally, mammary glands show differences in uptake pattern when a tumor is present. Taken together, these results suggest that radioiodide imaging is a promising in vivo method for monitoring the changes associated with tumor development such as changes of tumor size, pattern, and aspects of gene-specific metabolism over both short and long durations. Our results also indicate that the classifiable heterogeneity present in dynamic gamma camera images may correlate with specific patterns or signatures of gene expression that, in turn, indicate tumor subtype and progression. These data may allow investigators to develop an effective and sensitive system of in vivo imaging of molecules and metabolism that reflect the molecular signature of a tumor in real time. Our system may provide a means for early detection, ideally even a precancerous state before malignancy develops, and a method to assess the overall state of a tumor with the goal of predicting the best therapeutic regime and following the efficacy of the therapy in real time by examining specific molecular targets.
Degree: Masters of Science in Biology

Files in this item

Files Size Format View Description
REB_Title_Approval_Abstract_Pages.pdf 38.30Kb PDF Thumbnail Thesis Title, Approval, Compliance, and Abstract Pages
REB_Table_of_Contents_072009.pdf 54.37Kb PDF Thumbnail Thesis Table of Contents, Dedication, Acknowledgements, Lists of Tables and Figures
REB_Thesis_072009.pdf 5.686Mb PDF Thumbnail Thesis, References, and Vita

This item appears in the following Collection(s)

Show full item record