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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
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c-Jun-mediated microRNA-302d-3p induces RPE dedifferentiation by targeting p21Waf1/Cip1.

Chao Jiang1, Ping Xie1, Ruxu Sun1

  • 1Department of Ophthalmology, The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, 210029, Nanjing, China.

Cell Death & Disease
|April 20, 2018
PubMed
Summary
This summary is machine-generated.

MicroRNA-302d-3p promotes age-related macular degeneration (AMD) by causing retinal pigment epithelium (RPE) dedifferentiation and abnormal blood vessel growth. Inhibiting this microRNA may offer a new therapeutic strategy for AMD.

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Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Genetics

Background:

  • Age-related macular degeneration (AMD) involves retinal pigment epithelium (RPE) dedifferentiation and choroidal neovascularization (CNV).
  • MicroRNAs (miRNAs) play a significant role in AMD pathogenesis.
  • miR-302d-3p was identified as a significantly downregulated miRNA during RPE differentiation.

Purpose of the Study:

  • To investigate the role of miR-302d-3p in RPE dedifferentiation and endothelium cell (EC) behavior.
  • To elucidate the downstream pathways regulated by miR-302d-3p in the context of AMD.
  • To analyze the therapeutic potential of targeting the miR-302d-3p pathway.

Main Methods:

  • In vitro studies using RPE and EC models.
  • Analysis of RPE characteristic markers, phagocytosis, migration, and proliferation.
  • Identification of upstream (c-Jun) and downstream (p21Waf1/Cip1) targets.
  • Assessment of EC tube formation.

Main Results:

  • miR-302d-3p induces RPE dedifferentiation, impairs phagocytosis, and promotes migration and proliferation.
  • c-Jun acts as an upstream regulator of miR-302d-3p expression.
  • miR-302d-3p targets p21Waf1/Cip1, inhibiting RPE differentiation and promoting cell cycle progression.
  • The miR-302d-3p/CDKN1A axis influences EC tube formation, suggesting a role in CNV.

Conclusions:

  • miR-302d-3p, regulated by c-Jun, contributes to both atrophic and exudative AMD.
  • This miRNA promotes RPE dedifferentiation and abnormal EC behavior by targeting p21Waf1/Cip1.
  • Pharmacological inhibition of miR-302d-3p presents a potential therapeutic strategy for AMD.