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A Quantitative Detection Method for MicroRNAs in the Kidney of an Ischemic Kidney Injury Mouse Model
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A protective role for microRNA-688 in acute kidney injury

Nicholas Chun1, Steven G Coca1, John Cijiang He1,2

  • 1Department of Medicine/Nephrology, Icahn School of Medicine at Mount Sinai, New York, New York, USA.

The Journal of Clinical Investigation
|November 13, 2018
PubMed

Insights

MicroRNA-668 (miR-668) protects against kidney damage from ischemia-reperfusion injury. This finding reveals a new therapeutic target for acute kidney injury (AKI) by inhibiting mitochondrial fragmentation.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Cellular Biology

Background:

  • Ischemia-reperfusion (I/R) injury causes significant cell death and organ failure.
  • Current treatments for I/R-associated damage are limited, and underlying injury pathways are not fully understood.

Purpose of the Study:

  • To identify novel molecular mechanisms and potential therapeutic targets for acute kidney injury (AKI).

Main Methods:

  • Investigated the role of microRNA-668 (miR-668) in murine models of I/R-induced AKI.
  • Assessed the effect of miR-668 on mitochondrial fission and renal function.
  • Examined the regulatory relationship between Hypoxia-inducible factor 1-alpha (HIF-1α) and miR-668.
  • Analyzed miR-668 expression in human AKI patient cohorts.

Main Results:

  • miR-668 was identified as a protective factor in I/R-induced AKI.
  • miR-668 represses mitochondrial fission protein MTP18, inhibiting pathogenic mitochondrial fragmentation.
  • Treatment with a miR-668 mimetic reduced mitochondrial fragmentation and improved kidney function in murine models.
  • HIF-1α is essential for miR-668 expression following I/R.
  • miR-668 levels were upregulated in human AKI patients.

Conclusions:

  • A novel HIF-1α/miR-668/MTP18 signaling axis was identified in AKI.
  • This axis represents a potential therapeutic target for mitigating I/R-induced kidney damage.

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