Author(s): Chen Z, Jia W, Kaufman PL, Cynader M. Immunohistochemical localization of dopamine-beta-hydroxylase in human and monkey eyes. Curr Eye Res. 1999 Jan;18(1):39-48. PMID 10075201
Journal: Current Eye Research, Volume 18, Issue 1, Jan 1999
PURPOSE To investigate the pattern of dopamine-beta-hydroxylase (DBH)-containing fibers in human and monkey eyes.
METHODS DBH-containing fibers were detected by immunohistochemistry. The primary antibody used recognized DBH, the key enzyme in the conversion of dopamine to noradrenaline.
RESULTS In the anterior segment, DBH immunoreaction product was found in the peripheral corneal endothelium layer, in both the dilator and sphincter muscles of the iris, as well as in the anterior border layer of the iris. The ciliary muscle and the stroma of the ciliary processes were also zones of concentration. In the posterior segment, staining was seen around blood vessels in the choroid, in the vascular walls of the short posterior ciliary arteries and in the ciliary nerves. The retina was also immunopositive, with specific labeling in cones and rods of photoreceptors, inner and outer plexiform layers and ganglion cell layer. There was no significant difference in the distribution of DBH-related immunoreactivity in human and monkey eyes.
CONCLUSIONS The localization of DBH-related immunoreactivity is generally consistent with the known physiological roles of noradrenaline. However, an apparently high concentration of the enzyme in the anterior border layer of the iris and in retinal photoreceptors raises questions about the possible role of DBH-containing fibers in these structures.