RESUMEN
The present study was to investigate in vitro the rat cardiomyocyte injury with targeting of home-made perfluorocarbon lipid particles with avidin-biotin interaction. Neonatal rat cardiomyocytes were cultured in vitro and divided into two groups: TNF-alpha activated group and non-activated group. Those in the TNF-alpha activated group were exposed to 200 ng/ml TNF-alpha solution for 6 hours and then cardiomyocytes in both groups were pretargeted with biotinylated ICAM-1 monoclonal antibodies, and were exposed to streptavidin, and then to homemade green fluorescently-labeled biotinylated perfluorocarbon lipid particles. Cardiomyocytes nucleus stained with Hoechst. The results were detected with fluorescence microscope. As a result, in TNF-alpha activated group, around blue fluorescent cardiomyocytes nucleus, a great amount of green fluorescent particles were found, while there were few green fluorescent particles in non-TNF activated group. It has been shown that ICAM-1 is expressed in the surface of cardiomyocytes when they are stimulated by TNF-alpha. Perfluorocarbon lipid particles associated with ICAM-1 monoclonal antibodies can be targeted to injured cardiomyocytes by avidin-biotin interaction.