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Updated: Feb 13, 2026
08:01
Induction of Hypoxia in Living Frog and Zebrafish Embryos
Published on: June 26, 2017
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Hypoxia inhibits the regulatory volume decrease in red blood cells of common frog (Rana temporaria)
Aleksandra Y Andreyeva1, Elizaveta A Skverchinskaya2, Stepan Gambaryan3
1The A.O. Kovalevsky Institute of Marine Biological Research, Russian Academy of Sciences, Lenninsky ave, 14, 119991 Moscow, Russia; Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, pr. Toreza, 21, 194223 St. Petersburg, Russia.
Summary
Red blood cells regulate volume after swelling, a process dependent on oxygen. Hemoglobin oxidation to methemoglobin inhibits this volume recovery in frog red blood cells.
Area of Science:
- Physiology
- Cell Biology
- Biochemistry
Background:
- Vertebrate red blood cells can recover cellular volume following hyposmotic swelling.
- Oxygen availability is crucial for this volume recovery process.
- The specific role of hemoglobin in regulating cell volume recovery remains unclear, especially in amphibian red blood cells.
Purpose of the Study:
- To investigate the volume recovery process in amphibian red blood cells under varying oxygenation and hemoglobin oxidation states.
- To elucidate the role of hemoglobin in the regulatory volume decrease (RVD) of frog red blood cells.
Main Methods:
- Utilized the low-angle light scattering method to measure cell volume changes.
- Examined red blood cells from the common frog (Rana temporaria) under different conditions: oxygenated, deoxygenated, and oxidized (methemoglobin formation).
- Assessed the impact of hyposmotic swelling on cell volume recovery.
Main Results:
- Demonstrated regulatory volume decrease (RVD) in oxygenated frog red blood cells.
- Showed that RVD was eliminated under hypoxic conditions.
- Observed that reoxygenation restored RVD in previously hypoxic cells.
- Found that oxidation of hemoglobin to methemoglobin significantly inhibited the volume recovery response in both oxygenated and reoxygenated hypoxic cells.
Conclusions:
- Oxygen availability is essential for the regulatory volume decrease in frog red blood cells.
- Hemoglobin's oxygenation state plays a critical role in cell volume regulation.
- Methemoglobin formation inhibits the volume recovery mechanism, highlighting hemoglobin's functional importance beyond oxygen transport.
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