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Recent studies have shown that angiogenesis-stimulatory factors exist in ocular tissues and play a crucial role in the development of some eye disorders such as diabetic retinopathy. However, there are few reports that studied location of angiogenesis factors in ocular tissues of experimental animals. We studied angiogenesis factors in ocular tissues of normal rabbits by chorioallantoic membrane (CAM) assay. Extracts derived from the retina, iris-ciliary body and optic nerve showed an evident activity of angiogenesis. Retinal extracts at 10 micrograms showed a strong angiogenic activity in 50% of CAMs (p less than 0.01). On the other hand, bovine serum albumin which is heterogeneous protein showed only a slight angiogenic activity at a high concentration (1,000 micrograms). The iris-ciliary body and optic nerve showed also an angiogenic activity as did the retina. Extracts from the heart, liver and serum showed no activity of angiogenesis. Thus, angiogenic activity was strongly present in the ocular tissues, especially in retina of the normal rabbits.

Angiogenesis factors in ocular tissues of normal rabbits on chorioallantoic membrane assay.