Substance P fibres in the anterior segment of the rabbit eye

Some laboratories have obtained diverging results regarding the presence of substance P fibres in the cornea possibly because different antibodies were used. This has been further investigated by comparing results with several antibodies on identically treated sections from the anterior segment of rabbit eyes. In the uvea all antisera gave identical results showing substance P fibres in the iris and ciliary processes. In the cornea, on the other hand, polyclonal rabbit or guinea-pig antibodies gave high background fluorescence and no immunofluorescence fibres were detected. In contrast, the background staining was low with the monoclonal antibody so that substance p immunoreactive fibres could be demonstrated subepithelially, intraepithelially and in the corneal stroma.