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Related Experiment Video

Updated: Feb 22, 2026

Modeling Hypoxia/Reoxygenation Injury in Proximal Tubular Epithelial Cells
06:23

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Published on: November 21, 2025

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Short-term hypoxia and vasa recta function in kidney slices.

Diana Braun1, Stefanie Dietze1, Tamara M J Pahlitzsch1

  • 1Institute of Vegetative Physiology, Charité-Universitätsmedizin Berlin, Germany.

Clinical Hemorheology and Microcirculation
|September 19, 2017
PubMed
Summary

Hypoxia/re-oxygenation increases the reactivity of descending vasa recta (DVR) to Angiotensin II. This heightened vasoreactivity in DVR may play a role in kidney damage following ischemic events.

Keywords:
Vasa rectaacute kidney injuryhypoxialive kidney slices

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Vascular Biology

Background:

  • Descending vasa recta (DVR) are crucial for supplying the inner outer renal medulla.
  • This region is particularly vulnerable to hypoxic injury.

Purpose of the Study:

  • To investigate the hypothesis that hypoxia/re-oxygenation (H/R) increases vasoreactivity in DVR.
  • To determine if this contributes to reduced medullary perfusion after ischemia.

Main Methods:

  • Functional experiments using live rat kidney slices (200μm).
  • Assessment of slice viability via TUNEL assay and H&E staining.
  • Measurement of DVR vasoreactivity to Ang II after H/R using DIC microscopy.
  • Quantification of NOS and NADPH enzyme mRNA expression in isolated vasa recta (VR).

Main Results:

  • Apoptotic cell percentage increased in medulla after 90 min of H/R.
  • Ang II-induced DVR constriction was reduced in controls over time but not after H/R.
  • Hypoxia exposure for 90 min decreased NOS enzyme mRNA expression.

Conclusions:

  • DVR exhibits increased reactivity to Ang II after H/R compared to controls.
  • This suggests a significant role for DVR in the pathophysiology of renal ischemia/reperfusion injury.