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Related Concept Videos

Hypoxia01:23

Hypoxia

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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...
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Regulation of Angiogenesis and Blood Supply01:24

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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...
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Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

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Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue,...
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Enzymes02:34

Enzymes

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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

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Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
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Enzymes in Addressing Hypoxia for Biomaterials Engineering.

Pejman Ghaffari-Bohlouli1,2, Hafez Jafari1, Lei Nie3

  • 13BIO-BioMatter, École Polytechnique de Bruxelles, Université Libre de Bruxelles, Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium.

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Hypoxia, or low oxygen, affects many diseases. This review explores using enzymes like catalase to generate oxygen in the body, improving stability and effectiveness for medical treatments.

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Area of Science:

  • Biomedical Engineering
  • Enzyme Catalysis
  • Nanotechnology

Background:

  • Hypoxia (low oxygen) is a critical factor in numerous diseases, including cancer and cardiovascular disorders.
  • Hypoxia-inducible factors (HIFs) mediate cellular responses to hypoxia, influencing metabolism, growth, and immune responses.
  • Enzymatic decomposition of hydrogen peroxide offers a strategy to generate oxygen and alleviate hypoxia.

Purpose of the Study:

  • To critically compare methods for enhancing catalase stability in vivo.
  • To review the structure, mechanism, and kinetics of catalase and catalase-like nanozymes.
  • To assess the potential of enzyme-based oxygen generation for biomedical applications.

Main Methods:

  • Literature review of current approaches for in vivo enzyme stabilization.
  • Comparative analysis of catalase and nanozyme properties.
  • Examination of enzyme kinetics and mechanisms of action.

Main Results:

  • Enzyme instability, particularly for catalase, limits in vivo efficacy.
  • Targeted delivery systems show promise for improving enzyme stability and therapeutic outcomes.
  • Catalase-like nanozymes offer potential alternatives with enhanced stability and tunable properties.

Conclusions:

  • Enhanced in vivo stability is crucial for therapeutic enzyme applications.
  • Nanozymes present a promising avenue for overcoming limitations of natural enzymes like catalase.
  • Further research into enzyme stabilization and nanozyme development is warranted for hypoxia-related disease treatment.