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Related Concept Videos

Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

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 hydroxylase and factor...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...

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Related Experiment Video

Updated: Jul 14, 2026

Videomorphometric Analysis of Hypoxic Pulmonary Vasoconstriction of Intra-pulmonary Arteries Using Murine Precision Cut Lung Slices
13:32

Videomorphometric Analysis of Hypoxic Pulmonary Vasoconstriction of Intra-pulmonary Arteries Using Murine Precision Cut Lung Slices

Published on: January 14, 2014

Heterogeneity of hypoxia-mediated decrease in I(K(V)) and increase in [Ca2+](cyt) in pulmonary artery smooth muscle

Oleksandr Platoshyn1, Ying Yu, Eun A Ko

  • 1Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0725, USA.

American Journal of Physiology. Lung Cellular and Molecular Physiology
|May 29, 2007
PubMed
Summary

Pulmonary artery smooth muscle cells (PASMC) show varied responses to hypoxia. Kv1.5 channel expression levels influence hypoxia sensitivity, affecting calcium levels and vasoconstriction.

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Area of Science:

  • Physiology
  • Cell Biology
  • Cardiovascular Research

Background:

  • Hypoxic pulmonary vasoconstriction (HPV) involves increased cytosolic calcium ([Ca(2+)](cyt)) in pulmonary artery smooth muscle cells (PASMC).
  • PASMC exhibit heterogeneous phenotypes impacting contractility, proliferation, and apoptosis, linked to gene expression and function.
  • Hypoxia's effects on voltage-gated potassium (Kv) currents (I(K(V))) and [Ca(2+)](cyt) are not uniform across all PASMC.

Purpose of the Study:

  • To investigate the heterogeneity of PASMC responses to acute hypoxia.
  • To determine the role of Kv channel expression, specifically Kv1.5, in hypoxia-mediated effects on PASMC.
  • To explore the mechanisms underlying variations in hypoxia-induced [Ca(2+)](cyt) changes in PASMC.

Main Methods:

  • Combined single-cell RT-PCR and patch-clamp techniques were employed.
  • Analysis of voltage-gated K+ currents (I(K(V))) and cytosolic Ca2+ ([Ca(2+)](cyt)) in response to acute hypoxia.
  • Quantification of Kv1.5 mRNA expression levels in hypoxia-sensitive versus hypoxia-insensitive PASMC.

Main Results:

  • Acute hypoxia decreased I(K(V)) in ~46% and increased [Ca(2+)](cyt) in ~53% of PASMC.
  • Hypoxia-sensitive PASMC exhibited significantly higher Kv1.5 mRNA expression than insensitive cells.
  • Hypoxia increased [Ca(2+)](cyt) in only 34% of cells, independent of resting [Ca(2+)](cyt) levels.

Conclusions:

  • PASMC heterogeneity contributes to variable responses to hypoxia.
  • Kv1.5 channel expression levels are a key factor in determining PASMC sensitivity to acute hypoxia.
  • Intrinsic cellular mechanisms likely regulate the heterogeneous hypoxia-mediated effects on [Ca(2+)](cyt) in PASMC.