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AAV Gene Augmentation of Truncated Complement Factor H Differentially Rescues Ocular Complement Dysregulation in a

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Local synthesis of complement factor H (CFH) is crucial for regulating eye complement, not circulating sources. This finding is key for developing CFH gene therapies for AMD.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Genetics

Background:

  • Complement dysregulation in the eye is linked to age-related macular degeneration (AMD).
  • Genetic variants of complement factor H (CFH) are strongly associated with AMD risk.
  • Understanding the ocular roles of CFH and its splice variant, factor H-like 1 (FHL-1), is vital for AMD pathogenesis.

Purpose of the Study:

  • To investigate the role of CFH and FHL-1 in ocular complement regulation from local versus circulating sources.
  • To assess the therapeutic efficacy of adeno-associated viruses (AAVs) expressing FHL-1 and a truncated CFH (tCFH) in restoring complement regulation in Cfh-/- mouse eyes and plasma.

Main Methods:

  • Utilized Cfh-/- mice as a model for complement dysregulation.
  • Administered AAV vectors expressing tCFH or FHL-1 via subretinal or tail vein injections.
  • Evaluated the efficacy of these constructs in regulating the alternative complement pathway.

Main Results:

  • Subretinal injection of tCFH, but not FHL-1, rescued factor B (FB) retention in the eye.
  • Both tCFH and FHL-1 restored FB detection in plasma after tail vein injections.
  • While circulating tCFH and FHL-1 reached the posterior eyecup, they did not significantly regulate local ocular complement.

Conclusions:

  • The C-terminus of human CFH is essential for complement regulation within the murine eye.
  • Local synthesis of exogenous CFH is required for maximal complement regulation in the retina.
  • These findings provide a foundation for developing CFH augmentation gene therapies for ocular diseases like AMD.