Trophic support for endogenous photoreceptors

"Trophic support for endogenous photoreceptors" refers to the combination of metabolic, neurotrophic, and paracrine signals from retinal cells—primarily Müller glia and the retinal pigment epithelium (RPE)—that are required for photoreceptor health, maintenance, and survival. These processes include the provision of growth factors (e.g., PEDF, CNTF, FGF), regulation of extracellular nutrients and ions, and removal of debris[1][3][7]. There is no single receptor or protein mediating these effects; multiple cell types and factors interact to maintain photoreceptor viability and delay degeneration in diseases such as retinitis pigmentosa or age-related macular degeneration[3][7]. Trophic support is primarily a physiological concept, not a discrete molecular target, though interventions often focus on enhancing or mimicking these support functions using recombinant factors or cell therapies[3][7]. The term is sometimes mistakenly listed as a target, but it should not be treated as a distinct receptor, enzyme, transporter, or conventional therapeutic target.

Other names

Trophic support for photoreceptorsNeurotrophic support of photoreceptorsPhotoreceptor maintenance

Promotion of photoreceptor survival via paracrine support (often by Müller glia or RPE); Modulation of photoreceptor cell death pathways; Maintenance of ionic and metabolic homeostasis.