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Investigative Ophthalmology & Visual Science, Vol 26, 1533-1542, Copyright © 1985 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Effect of irradiation on vascularization of corneas grafted onto chorioallantoic membranes

HJ Glatt, MT Vu, PC Burger and GK Klintworth

Several studies have shown that total body irradiation decreases the angiogenic response to corneal cauterization. This inhibition could be due to alterations in angiogenic stimuli within injured corneas and/or to a decreased ability of irradiated animals to respond to such stimuli. To determine whether total body irradiation specifically affects angiogenic stimuli within injured corneal tissue, cauterized corneas from mice exposed to 900 rads of total body irradiation and from non-irradiated controls were grafted onto the chorioallantoic membranes (CAM) of chick embryos and their abilities to stimulate the ingrowth of healthy embryonic blood vessels were compared. Cauterized corneas incorporated into CAM mesenchymal tissue were invaded by blood vessels in 34.6% of the irradiated group and in 75% of the non- irradiated controls. This difference in the two groups was statistically significant (P less than 0.03). Total body irradiation significantly decreased the frequency of vascular invasion of cauterized corneal tissues by healthy CAM blood vessels. This finding suggests that total body irradiation can specifically affect the stimulus for angiogenesis within cauterized corneas.


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