The ocular tissue is one of the most densely populated tissues in the body with extremely small blood vessels, and vascular lesions have been reported to be a factor in vision loss and visual field defects in many ocular diseases. Currently, vascular endothelial growth factor (VEGF)-targeted agents are the first line of treatment for intraocular vascular lesions, however, there are some cases in which they are not fully effective. Therefore, we explored pathogenic molecules other than VEGF, aiming to develop new molecular-targeted therapy. Using an experimental pathological model mimicking intraocular vascular lesions, we found that B-cell CLL/lymphoma 6 member B protein (BCL6B), which has been identified as a Bric-a-brac, Tramtrack, and Broad Complex protein, may play an important role in intraocular angiogenesis and vascular hyperpermeability. In this article, we introduce the usefulness of suppressing BCL6B expression and discuss the possibility of drug discovery by targeting Notch signaling in chorioretinal vascular lesions.
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