The development of a highly specific radiochemical compound based on labeled 99mtc recombinant molecules for targeted imaging of cells with the overexpression of Her-2 / neu
Currently, there is a urgent need to search for new diagnostic methods that allow us to reveal malignant tumors with the overexpression of Her-2/neu with high accuracy. In recent years radioisotope methods have been actively developing to identify specific tumor targets, with antibodies being the “targeting” module. The purpose of the study. Creation of a chemically stable radiochemical compound for the imaging of cells with the overexpression of Her-2/neu. Materials and methods. The study was conducted using two human adenocarcinoma cell lines with expression (BT-474) and without expression (MCF-7) Her-2/neu. The specificity of the binding of the test complex with Her-2/neu receptor was determined by direct radiometric and planar scintigraphy. To evaluate the differences in quantitative characteristics between the groups a non-parametric Mann - Whitney test was used. Results. The yield of the labeled complex was more than 91% and the radiochemical frequency was more than 94%. When performing a visual scintigraphic evaluation, a much higher accumulation rate of the studied radiopharmaceutical preparation (RFP) was observed in the culture of cells with overexpression of the surface Her-2/neu receptor. Direct radiometric results also demonstrated a higher accumulation of RFPs in the human BT-474 mammary adenocarcinoma cell line with Her-2/neu overexpression in comparison with the control group. Conclusion. Preclinical studies demonstrated high stability of the test compound, as well as its accumulation in the group of cells with Her-2/neu overexpression.