The distribution of latex microspheres (1.1 microns diam) has been investigated in-vivo, as a potential passive targeted system for the treatment of inflammation. Microspheres administered orally were found in the circulation and in inflamed tissues and exudates of inflammatory air pouches in rats. Oral absorption was also found in a rabbit. Particles administered directly into the circulation also penetrated into the air pouch tissues and fluids. The possibility of using microspheres as a passive targeted system for the treatment of inflammation is discussed.
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