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Graefes Arch Clin Exp Ophthalmol
1993 Jun 01;2316:313-7. doi: 10.1007/bf00919026.
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Hyaluronan synthase immunoreactivity in the anterior segment of the primate eye.
Rittig M
,
Flügel C
,
Prehm P
,
Lütjen-Drecoll E
.
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The anterior segment of human and cynomolgus monkey eyes was investigated for the presence of hyaluronan (HA) synthesizing cells using a polyclonal antibody against the enzyme HA synthase (HAS). In the chamber angle region the most intense staining was seen in the cell membranes of the corneal endothelium and in monkey eyes in the cells covering the posterior extension of the cornea (the operculum). The trabecular meshwork cells of the uveal and inner corneoscleral lamellae were also intensely stained. On the other hand, no staining was observed in the trabecular cells of the outer corneoscleral and the cribriform meshwork. The cell membranes of the inner wall endothelium of Schlemm's canal were labelled only at their luminal surface. In the iris stroma and the trabeculum ciliare (the ciliary body band), labelled cells were also found, whereas the connective tissue of the ciliary muscle and the muscle itself did not contain HAS-positive cells. In the ciliary processes immunoreactivity was seen in the non-pigmented epithelial cells (NPE) covering the anterior tips of the processes, suggesting that HA found in the aqueous humor is produced by these cells. The pars plana NPE showed the most intense staining in the cells directly adjacent to the ora serrata region. The hyalocytes found in the neighborhood of the pars plana also showed intense HAS immunoreactivity. It is likely that both hyalocytes and NPE cells of the posterior pars plana release HA into the vitreous.
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