The invention provides compositions and methods for visualizing particular tissues and delivering one or more therapeutics to that tissue using single-walled carbon nanotubes (SWNTs), which are taken up and delivered to target tissues by specific monocytes in the body. The delivery of SWNT to target tissues allows the visualization of the affected tissue for diagnostics and therapy in diseases where the specific monocyte is implicated in the disease pathogenesis. These nanotubes can be conjugated to a peptide, such as RGD, which helps direct the SWNT-containing monocytes to the vascular endothelium.
