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(Investigative Ophthalmology and Visual Science. 2004;45:4251-4255.)
© 2004 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.03-1108
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Neurally Selected Embryonic Stem Cells Induce Tumor Formation after Long-Term Survival following Engraftment into the Subretinal Space

Stefan Arnhold,1 Helmut Klein,1 Irina Semkova,2 Klaus Addicks,1 and Ulrich Schraermeyer2

1From the Department of Anatomy I, University of Cologne, Cologne, Germany; and the 2Section of Vitroretinal Surgery, University Eye Clinic Tübingen, Tübingen, Germany.

PURPOSE. To determine whether transplantation of embryonic stem (ES) cells into the subretinal space of rhodopsin-knockout mice has a tumorigenic effect.

METHODS. Mouse ES-cell–derived neural precursor cells carrying the sequence for the green fluorescent protein (GFP) gene were grafted subretinally into the eyes of rhodopsin–/– mice, whereas control animals underwent sham surgery. Eyes were retrieved after 2, 4, and 8 weeks after cell injection or sham surgery for histologic analysis.

RESULTS. Gross morphologic, histologic, and immunohistochemical analysis of eyes at 2 and 4 weeks after engraftment exhibited no morphologic alterations, whereas neoplasia formation was detected in 50% of the eyes evaluated at 8 weeks after engraftment. Because the neoplasias expressed differentiation characteristics of the different germ layers, they were considered to be teratomas. The resultant tumor formation affected almost all layers of the eye, including the retina, the vitreous, and the choroid.

CONCLUSIONS. Although ES cells may provide treatment for degenerative disease in the future, their unlimited self-renewal and high differentiation potential poses the risk of tumor induction after engraftment. Thus, more care must be taken before using ES cell transplantation as a therapeutic option for patients with degenerative disease.




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