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High-Resolution Respirometry to Assess Bioenergetics in Cells and Tissues Using Chamber- and Plate-Based Respirometers
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FACTORS INFLUENCING THE RESPIRATION OF ERYTHROCYTES : II. MAMMALIAN RETICULOCYTES
1Cancer Commission of Harvard University, and the Department of Physical Chemistry in the Laboratories of Physiology, Harvard Medical School, Boston.
The Journal of General Physiology
|October 30, 2009
Summary
Rabbit reticulocyte respiration remains constant per cell during anemia regeneration. Optimal oxygen consumption occurs at pH 8, unaffected by tonicity or amino acids but potentially inhibited by glucose.
Area of Science:
- Hematology
- Cellular Respiration
- Biochemistry
Background:
- Reticulocytes, immature red blood cells, play a crucial role in erythropoiesis.
- Understanding their metabolic activity, particularly oxygen consumption, is vital for studying red blood cell production and function.
- Anemia models, like phenylhydrazine-induced anemia, provide a framework to investigate reticulocyte responses.
Purpose of the Study:
- To quantify the oxygen consumption of rabbit reticulocytes during induced anemia and regeneration.
- To investigate the influence of environmental factors (pH, tonicity, nutrients) on reticulocyte respiration.
- To compare the respiratory activity of nucleated and non-nucleated reticulocytes.
Main Methods:
- Measurement of oxygen consumption in rabbit reticulocytes using Warburg manometry.
- Experimental manipulation of the suspending medium's pH and tonicity.
- Assessment of substrate utilization (glycine, alanine, glucose) and its effect on respiration.
- Comparative analysis of reticulocyte respiration from rabbits and fowls.
Main Results:
- Oxygen consumption per billion reticulocytes remained constant during anemia and regeneration, despite increased overall respiration.
- Reticulocyte respiration peaked at pH 8, with an estimated intracellular pH of 7.75.
- Tonicity variations had minimal impact; glycine, alanine, and glucose did not enhance respiration, with glucose potentially inhibiting it at higher concentrations.
- Nucleated avian reticulocytes exhibited approximately twice the respiration of non-nucleated mammalian reticulocytes per unit volume.
Conclusions:
- The intrinsic respiratory capacity of individual reticulocytes is maintained during regeneration.
- Reticulocyte respiration is sensitive to pH but not significantly affected by tonicity or common metabolic substrates.
- Significant differences exist in respiratory efficiency between nucleated and non-nucleated reticulocytes.
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