Bone morphogenetic protein signaling as a key regulator of retinal fibrosis.

BMP2/4-ALK signaling drives retinal fibrosis, with BMP2 levels reaching up to 180 pg/mL in proliferative retinal diseases, highlighting its key role in disease progression.

• Why it matters: Retinal fibrosis causes blindness in conditions like PDR, PVR, and AMD, yet effective treatments are lacking, underscoring the need to understand underlying mechanisms for targeted therapies.
• What they did: The study examined BMP2/4 and ALK signaling through patient vitreous analysis, mouse models with intravitreal BMP2 injections, and cultured retinal cells, revealing their involvement in fibrotic membrane formation.
• The result: Blocking BMP/ALK signaling with LDN193189 reduced membrane formation and fibrotic markers, suggesting that targeting this pathway could enable new treatments for retinal fibrosis.