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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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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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Related Experiment Video

Updated: Jun 6, 2025

Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis
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miRNA-6236 Regulation of Postischemic Skeletal Muscle Angiogenesis.

Arul M Mani1, Victor Lamin1, Ronan C Peach1

  • 1Division of Endocrinology and Metabolism, Carver College of Medicine University of Iowa Iowa City IA USA.

Journal of the American Heart Association
|November 27, 2024
PubMed
Summary
This summary is machine-generated.

A novel microRNA, miR-6236, is elevated in peripheral arterial disease. Inhibiting miR-6236 improves blood flow recovery and blood vessel formation after ischemia.

Keywords:
angiogenesisendothelial cellsischemiamiR‐6236peripheral arterial disease

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Area of Science:

  • Molecular Biology
  • Cardiovascular Research
  • Genetics

Background:

  • Peripheral arterial disease (PAD) affects over 200 million people globally, characterized by reduced blood flow to the limbs.
  • Current treatments for PAD are limited, highlighting the need for novel therapeutic targets.
  • A newly identified microRNA, miR-6236, was found to be upregulated in ischemic limb tissues.

Purpose of the Study:

  • To investigate the role of miR-6236 in peripheral arterial disease (PAD) and its impact on angiogenesis.
  • To determine the effect of miR-6236 on endothelial cell function under ischemic conditions.
  • To evaluate the therapeutic potential of targeting miR-6236 for improving perfusion recovery in PAD.

Main Methods:

  • Utilized in vitro models with primary human and mouse endothelial cells exposed to simulated ischemia.
  • Developed miR-6236 knockout mice to assess its function in vivo.
  • Employed the mouse hind-limb ischemia model to evaluate postischemic perfusion recovery.
  • Conducted bioinformatics and gene expression analyses to identify miR-6236 targets.

Main Results:

  • Simulated ischemia increased miR-6236 expression in endothelial cells; its inhibition enhanced cell viability, migration, and tube formation while reducing apoptosis.
  • miR-6236 knockout mice exhibited improved perfusion recovery and angiogenesis in a diabetic PAD model.
  • Six predicted angiogenic target mRNAs showed expression patterns consistent with miR-6236 regulation in ischemic muscle.

Conclusions:

  • miR-6236 is a key regulator of postischemic angiogenesis and perfusion recovery in peripheral arterial disease.
  • Targeting miR-6236 presents a promising therapeutic strategy for enhancing vascular repair in PAD.
  • This study elucidates a novel molecular mechanism underlying vascular dysfunction in PAD.