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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...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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...
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Factors Affecting Erythropoiesis01:24

Factors Affecting Erythropoiesis

The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...

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Related Experiment Video

Updated: Jul 7, 2026

Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury
14:48

Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury

Published on: March 21, 2021

Red blood cells induce hypoxic lung inflammation.

Rainer Kiefmann1, Joseph M Rifkind, Enika Nagababu

  • 1Lung Biology Laboratory, College of Physicians & Surgeons, Columbia University, St Luke's Roosevelt Hospital Center, New York, NY, USA.

Blood
|February 14, 2008
PubMed
Summary

Red blood cells (RBCs) drive inflammation during hypoxia by releasing reactive oxygen species (ROS). This discovery reveals a new mechanism linking RBCs to inflammatory diseases and provides therapeutic targets.

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Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice
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Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice

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Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury
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Area of Science:

  • Cardiovascular Biology
  • Respiratory Medicine
  • Cellular Physiology

Background:

  • Hypoxia is linked to cardiovascular and respiratory diseases, often causing inflammation.
  • The precise mechanisms underlying hypoxia-induced inflammation remain unclear.
  • Red blood cells (RBCs) are implicated in this inflammatory response.

Purpose of the Study:

  • To elucidate the role of RBCs in hypoxia-induced inflammation.
  • To identify the specific mechanisms by which RBCs contribute to inflammation under hypoxic conditions.
  • To investigate the involvement of reactive oxygen species (ROS) and endothelial cell activation.

Main Methods:

  • Utilized real-time fluorescence imaging in rat and mouse lung models.
  • Employed RBC-containing and RBC-free vascular perfusion techniques.
  • Investigated the effects of inhibiting hemoglobin autoxidation (using CO or nitrite) and ROS (using catalase).
  • Compared responses using RBCs from normal and BERK-trait mice.

Main Results:

  • Hypoxia increased microvascular ROS and cytosolic Ca(2+) in the presence of RBCs, leading to leukocyte recruitment.
  • RBC-free perfusion completely abolished hypoxia-induced inflammatory responses.
  • Inhibiting hemoglobin autoxidation or neutralizing ROS prevented hypoxia-induced inflammation.
  • RBCs from BERK-trait mice exacerbated hypoxia-induced responses.

Conclusions:

  • RBCs initiate hypoxic inflammation by producing ROS via hemoglobin autoxidation.
  • Hypoxia increases RBC superoxide production, leading to H(2)O(2) release and endothelial activation.
  • These findings highlight RBCs as key mediators of hypoxia-induced inflammation, offering potential therapeutic avenues.