Chapter

Inflammation and Retinal Disease: Complement Biology and Pathology

Volume 703 of the series Advances in Experimental Medicine and Biology pp 137-149

Date:

A Targeted Inhibitor of the Complement Alternative Pathway Reduces RPE Injury and Angiogenesis in Models of Age-Related Macular Degeneration

  • Bärbel RohrerAffiliated withDepartment of Ophthalmology, Medical University of South CarolinaDepartment of Neuroscience, Medical University of South Carolina Email author 
  • , Qin Long
  • , Beth Coughlin
  • , Brandon Renner
  • , Yuxiang Huang
  • , Kannan Kunchithapautham
  • , Viviana P. Ferreira
  • , Michael K. Pangburn
  • , Gary S. Gilkeson
    • , Joshua M. Thurman
    • , Stephen Tomlinson
    • , V. Michael Holers

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Abstract

Genetic variations in complement factor H (fH), an inhibitor of the complement alternative pathway (CAP), and oxidative stress are associated with age-related macular degeneration (AMD). Recently, novel complement therapeutics have been created with the capacity to be “targeted” to sites of complement activation. One example is our recombinant form of fH, CR2-fH, which consists of the N-terminus of mouse fH that contains the CAP-inhibitory domain, linked to a complement receptor 2 (CR2) targeting fragment that binds complement activation products. CR2-fH was investigated in vivo in the mouse model of choroidal neovascularization (CNV) and in vitro in oxidatively stressed RPE cell monolayers. RPE deterioration and CNV development were found to require CAP activation, and specific CAP inhibition by CR2-fH reduced the loss of RPE integrity and angiogenesis in CNV. In both the in vivo and in vitro paradigm of RPE damage, a model requiring molecular events known to be involved in AMD, complement-dependent VEGF production, was confirmed. These data may open new avenues for AMD treatment strategies.