Abstract
The distribution of Thy-1-like immunoreactivity was studied in whole-mounts of adult mouse iris and intraocular iris grafts 4 days and 4 weeks postoperatively. After fixation in picric acid/paraformaldehyde, the irides were incubated with a polyclonal rabbit anti-mouse brain Thy-1 antibody. In the adult mouse iris, a dense network of thin bundles and individual fibres was seen on the dilator plate and in the sphincter. Fluorescence paucities, resembling Schwann cell nuclei, were frequently seen along the bundles. Numerous mast cells, stained specifically with the Thy-1 antibody, were scattered over the entire surface of the iris. The ciliary body contained several brightly fluorescent bundles, and some circularly running individual fibres. In 4-day iris grafts, the Thy-1-like immunoreactivity had disappeared, except in mast cells. After 4 weeks in oculo, a regular plexus of thin fibres had reappeared in the iris grafts. Sympathetic denervation of adult irides did not seem to affect the Thy-1 immunoreactivity in terms of either fluorescence intensity or fibre distribution. The present data suggest a distribution of the glycoprotein Thy-1 along nerve fibres in the iris.
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