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Penetration of Bevacizumab through the Retina after Intravitreal Injection in the Monkey

¹From Experimental Vitreoretinal Surgery, and the ³Centre of Ophthalmology, University Eye Hospital, Tübingen, Germany; the ⁴Institute of Anatomy, University of Tübingen, Tübingen, Germany; the ²Steinbeis Transfer Centre for Pathology and Toxicology of the Eye, Tübingen, Germany; and ⁵Covance Laboratories, Münster, Germany.

PURPOSE. The penetration of intravitreally injected bevacizumab in its commercial formulation (Avastin; Roche, Grenzach, Germany) through the retina was studied, to determine whether a full-length antibody would be able to penetrate the retina as easily as an antibody fragment.

METHODS. Six cynomolgus monkeys (Macaca fascicularis) were used in this study. Two compositions of intravitreal injection into the right eyes were performed: one with commercial Avastin (group 1, four animals) and the other one with commercial Avastin labeled with ¹²⁵I (group 2, one animal). The animals in group 1 were killed 1, 4, 7, or 14 days after the injection for subsequent histologic analysis of the eyes by immunohistochemistry, and the animal in group 2 was killed 7 days after injection for autoradiography and electron microscopy. Funduscopy was performed before the injection and at several time points thereafter. Moreover, blood samples were collected at different time points from the group-2 animal. The sixth animal remained untreated and served as the control.

RESULTS. No pathologic changes were obvious in the funduscopic images within the time of the experiment. Bevacizumab immunoreactivity was found in the choroid and the inner layers of the retina as early as 1 day after the injection and spread to the outer layers and the choroid within the following days, in particular to photoreceptors and blood vessels. Avastin labeled with ¹²⁵I showed radioactivity in blood serum 1 day after the intravitreal injection and remained relatively stable until day 7.

CONCLUSIONS. The results clearly show that the bevacizumab molecule can penetrate the retina and is also transported into the retinal pigment epithelium, the choroid and, in particular, into photoreceptor outer segments after intravitreal injection of Avastin. Active transport mechanisms seem to be involved.

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				S. Kaempf, S. Johnen, A. K. Salz, A. Weinberger, P. Walter, and G. Thumann Effects of Bevacizumab (Avastin) on Retinal Cells in Organotypic Culture Invest. Ophthalmol. Vis. Sci., July 1, 2008; 49(7): 3164 - 3171. [Abstract] [Full Text] [PDF]

				S Peters, P Heiduschka, S Julien, K-U Bartz-Schmidt, and U Schraermeyer Immunohistochemical localisation of intravitreally injected bevacizumab in the anterior chamber angle, iris and ciliary body of the primate eye Br. J. Ophthalmol., April 1, 2008; 92(4): 541 - 544. [Abstract] [Full Text] [PDF]