Retinal pigment epithelium cell stress response (RPE stress response)

The retinal pigment epithelium (RPE) cell stress response is a complex physiological process involving various cellular pathways aimed at maintaining retinal homeostasis under pathological conditions. The RPE is a monolayer of pigmented cells situated between the neurosensory retina and the choroid, performing critical functions such as nutrient transport, phagocytosis of photoreceptor outer segments, and protection against light-induced oxidative damage (Source: NIH/NEI). When subjected to chronic stressors—such as oxidative stress, accumulation of lipofuscin, or inflammation—the RPE activates stress response mechanisms including the unfolded protein response (UPR), autophagy, and the Nrf2-mediated antioxidant pathway (Source: Progress in Retinal and Eye Research). Dysregulation or exhaustion of these responses is a hallmark of degenerative eye diseases, most notably age-related macular degeneration (AMD) and diabetic retinopathy (Source: Journal of Clinical Medicine). Therapeutic strategies often focus on specific molecular components within this response, such as activating antioxidant enzymes or inhibiting the complement system, to prevent RPE cell death and subsequent vision loss (Source: PubMed/StatPearls).

Other names

RPE oxidative stress responseRetinal pigment epithelium dysfunctionRPE cellular stress responseRPE proteostasis response

Modulation of oxidative stress pathways, activation of antioxidant response elements (ARE) via Nrf2, and inhibition of the complement cascade to preserve RPE integrity and prevent cell death.