Retinal photoreceptor and bipolar cells

Retinal photoreceptor and bipolar cells are specialized neuronal populations within the retina that facilitate the first two stages of visual processing. Photoreceptors, consisting of rods and cones, are responsible for phototransduction, converting light into electrical signals (Purves et al., 2001). These signals are then transmitted to bipolar cells, which integrate and relay the information to retinal ganglion cells for transmission to the brain (Euler et al., 2014). Degeneration of these cells is the hallmark of various inherited and acquired retinal diseases, such as retinitis pigmentosa and macular degeneration, leading to progressive vision loss (Hartong et al., 2006). Because these cells are the site of pathology, they are the primary focus for advanced therapies including gene therapy, optogenetics, and cell-based regenerative medicine. For instance, gene therapies like voretigene neparvovec target the underlying genetic defects in these cells to preserve vision (Russell et al., 2017). Overall, these cells represent the functional core of the outer and middle retina and are essential for visual perception.

Other names

PhotoreceptorsBipolar neuronsRetinal neuronsRods and conesRetinal interneurons

Therapeutic strategies targeting these cells typically involve gene replacement therapy to restore missing proteins, neuroprotective agents to prevent cell death, or optogenetic tools to confer light sensitivity to surviving bipolar cells in the absence of photoreceptors (Euler et al., 2014; Russell et al., 2017).