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Analyzing Angiotensin II Receptor Type 1 Clustering in PC12 Cells in Response to Hypoxia Using Direct Stochastic

Hayyaf S Aldossary1,2, Daniel J Nieves3, Deirdre M Kavanagh4

  • 1School of Biomedical Sciences, Institute of Clinical Sciences, University of Birmingham, Birmingham, UK. hxa807@student.bham.ac.uk.

Advances in Experimental Medicine and Biology
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PubMed
Summary

Angiotensin II receptor type 1 (AT1R) nanoscale distribution was studied in oxygen-sensitive cells. Hypoxia altered AT1R clustering, suggesting a role in augmented sensitivity.

Keywords:
Angiotensin IIAngiotensin II receptor type 1Chronic hypoxiaDirect stochastic optical reconstruction microscopy (dSTORM)PC12 cellsSingle-molecule localization

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Area of Science:

  • Cellular physiology
  • Molecular cell biology
  • Neuroscience

Background:

  • Angiotensin II (Ang II) is a key hormone for homeostasis.
  • Angiotensin II receptor type 1 (AT1R) is present in oxygen-sensitive cells like carotid body type I cells.
  • Ang II and AT1R activity increases cell function, but their nanoscale distribution and response to hypoxia are unknown.

Purpose of the Study:

  • To determine the nanoscale distribution of AT1R in normoxic conditions.
  • To investigate how hypoxia alters AT1R single-molecule arrangement and clustering.

Main Methods:

  • Direct stochastic optical reconstruction microscopy (dSTORM) was used to visualize AT1R nanoscale distribution.
  • PC12 cells were used as a model system.
  • Cells were exposed to normoxic and hypoxic (1% O2) conditions for 24 hours.

Main Results:

  • AT1Rs form distinct clusters on the cell surface with an average density of approximately 3 clusters/μm².
  • Cluster areas varied significantly, ranging from 1.1 × 10⁻⁴ to 3.9 × 10⁻² μm².
  • Hypoxia exposure led to increased maximum AT1R cluster area, indicating supercluster formation.

Conclusions:

  • The nanoscale distribution of AT1R is measurable and characterized by clustering.
  • Hypoxia significantly alters AT1R clustering, suggesting a mechanism for enhanced Ang II sensitivity in oxygen-sensitive cells.
  • These findings contribute to understanding cellular responses to hypoxia and Ang II signaling.