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Updated: Aug 14, 2026

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11:44

Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis

Published on: March 30, 2019

MicroRNA-34a suppresses KLF2 to promote pathological angiogenesis through the CXCR4/CXCL12 pathway in age-related

Jason J Colasanti1,2, Andrea Santeford1, Joseph B Lin1,3

  • 1Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO 63110.

Proceedings of the National Academy of Sciences of the United States of America
|August 12, 2026
PubMed

Insights

MicroRNA-34a (miR-34a) promotes pathological angiogenesis in age-related macular degeneration (AMD) by targeting KLF2, independent of VEGFa. This finding links aging-related miR-34a to neovascularization in AMD.

Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Gerontology

Background:

  • Age-related macular degeneration (AMD) causes vision loss in the elderly, often due to choroidal neovascularization (CNV).
  • Current treatments targeting VEGFa have limitations, necessitating exploration of alternative therapeutic pathways.
  • The role of microRNA-34a (miR-34a) in neovascular AMD pathogenesis remains largely undefined.

Purpose of the Study:

  • To investigate the role and mechanism of miR-34a in the development of pathological angiogenesis in age-related macular degeneration (AMD).

Main Methods:

  • Utilized an injury-induced murine CNV model to study miR-34a's effect on angiogenesis.
  • Analyzed miR-34a's direct molecular targets, including KLF2, CXCR4, and CXCL12.
  • Examined miR-34a expression in aged mice and human wet AMD CNV lesions.

Main Results:

  • miR-34a was found to promote pathological angiogenesis in a murine CNV model, irrespective of canonical VEGFa signaling.
  • Mechanistically, miR-34a directly inhibits the transcription factor KLF2, leading to upregulation of proangiogenic factors CXCR4 and CXCL12.
  • miR-34a exacerbated CNV in aged mice and was detected in CNV lesions from wet AMD patients.

Conclusions:

  • Established a causal link between age-related miR-34a and neovascularization in AMD.
  • Identified miR-34a as a novel regulator of pathological angiogenesis in AMD, acting via the KLF2/CXCR4/CXCL12 axis.
  • Suggests miR-34a as a potential therapeutic target for AMD treatment.
Keywords:
KLF2age-related macular degenerationchoroidmicroRNA-34aneovascularization

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