CGRP induces TSP1 and A2M expression in corneal tissue, creating a stress-protective response that dampens inflammation and fibrosis after corneal injury — blocking CGRP worsens corneal damage.
CGRP protects corneasBlocking CGRP (as migraine drugs do) suppressed protective TSP1/A2M signaling and worsened corneal injury in mice
What the researchers found
CGRP induces TSP1 and A2M expression (both in vitro and in vivo). CGRP receptor antagonism (BIBN4096) suppresses TSP1/A2M and worsens corneal lesions. Thbs1-/- mice show exacerbated corneal inflammation and fibrosis. Pathway conserved in human corneal injury.
Why it matters
Anti-CGRP migraine drugs are used by millions. This study shows CGRP protects the cornea from injury — raising important safety questions about long-term corneal health in migraine patients on CGRP-blocking drugs.
How the study worked
Corneal stromal injury model in WT and Thbs1-/- mice, single-cell/bulk RNA sequencing, human keratocyte studies, CGRP receptor antagonism (BIBN4096), A2M depletion, and human corneal scar tissue analysis.
What this study cannot tell us
Mouse models may not fully replicate human corneal biology. BIBN4096 is short-acting. Long-term effects of chronic CGRP blockade on corneal health unknown. Human tissue analysis was observational.
How to read the evidence
Comprehensive multi-modal preclinical study with human tissue validation. Important safety signal for anti-CGRP drugs.
When this study was published
Published in 2025.
The bigger picture
This reveals a protective function of CGRP in the eye that has implications for the safety profile of anti-CGRP migraine drugs, particularly regarding corneal health.
Questions still open
- Do patients on long-term anti-CGRP migraine drugs have increased corneal complication risk?
- Could TSP1 or A2M be developed as corneal healing therapeutics?
- Should ophthalmologic monitoring be recommended for chronic anti-CGRP drug users?
Common questions
Could anti-CGRP migraine drugs affect my eyes?
Why does CGRP protect the cornea?
Read the original research
CGRP/TSP1 Signaling Dampens Corneal Inflammation and Fibrosis by Targeting A2M During Corneal Stromal Wound Healing.
Investigative ophthalmology & visual science, 67(1), 10
Citation
Ge, Hongqi; Zhang, Yangyang; Guo, Qian; Li, Ya; Yang, Lingling; Zang, Xinyi; Xie, Jin; Wang, Yao; Li, Yizhou; Qi, Xia; Wang, Yalin; Zhou, Qingjun; Wang, Xiaolei. (2026). CGRP/TSP1 Signaling Dampens Corneal Inflammation and Fibrosis by Targeting A2M During Corneal Stromal Wound Healing.. Investigative ophthalmology & visual science, 67(1), 10. https://doi.org/10.1167/iovs.67.1.10