Gut Microbiome and Retinopathy of Prematurity.

Retinopathy of prematurity (ROP), a leading cause of childhood blindness worldwide, is strongly associated with gestational age and weight at birth. Yet, many extremely preterm infants never develop ROP or develop only mild ROP with spontaneous regression. In addition, a myriad of other factors play a role in the retinal pathology, one of which may include the early gut microbiome. Among the complications associated with early gestational age include dysbiosis of the dynamic neonatal gut microbiome, as evidenced by the development of often concomitant conditions such as necrotizing enterocolitis (NEC). Given this, alongside growing evidence for a gut-retina axis, there is an increasing interest in how the early intestinal environment may play a role in the pathophysiology of ROP. Potential mechanisms include dysregulation of vascular endothelial growth factor (VEGF) and insulin-like growth factor 1 (IGF-1). Furthermore, the gut microbiome may be impacted by other known risk factors for ROP such as intermittent hypoxia and sepsis treated with antibiotics. In this mini-review, we summarize the literature supporting these proposed avenues, establishing a foundation to guide future studies.