Potential use of the ATWLPPR heptapeptide as a molecular imaging agent of tumor angiogenesis
DOI:
https://doi.org/10.35954/SM2019.38.1.4Keywords:
ATWLPPR, HYNIC, Oncological Molecular Imaging, Breast Neoplasms, Technetium Tc 99m SestamibiAbstract
Molecular Imaging comprises the visualization, characterization and measurement of biological processes at the molecular and cellular level in humans or other living beings. This discipline includes 2 or 3 dimension imaging and their quantification over time. Techniques used include, among others, nuclear medicine. This has led to the definition of molecular imaging agents, as probes used to visualize, characterize and measure biological processes in living systems, where endogenous and exogenous molecules can be used. In the present paper we propose to develop and optimize the gamma emitting radionuclide labeling, 99m-Technetium, of the anti-angiogenic heptapeptide, the ATWLPPR, in order to assess its potential use as a molecular imaging agent of the angiogenic processes associated with breast cancer. For this, both HYNIC-ATWLPPR and HYNIC-GSGATWLPPR were commercially purchased. The 99mTclabeling was performed at 50 °C in the presence of different co-ligands including Tricine, Ethylenediamine diacetic acid, Tricine/Ethylenediamine diacetic acid and Tricine/Nicotinic acid. Labeling conditions (pH, coligands concentration of reducing agent (tin chloride), temperature and reaction time) were optimized in order to standardize the procedure.
Radiochemical purities were assessed by HPLC.
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