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Fast transmembrane exchange in red cells studied with NMR
Biomedica Biochimica Acta
|January 1, 1987
Summary
Nuclear Magnetic Resonance (NMR) spectroscopy measured the bicarbonate permeability coefficient of human red blood cells. Results align with non-NMR techniques, validating this NMR approach for erythrocyte transport studies.
Area of Science:
- Biophysics
- Analytical Chemistry
Background:
- Understanding transmembrane transport is crucial for red blood cell physiology.
- Nuclear Magnetic Resonance (NMR) offers advanced spectroscopic techniques for studying cellular processes.
Purpose of the Study:
- To measure the bicarbonate (H13CO3-) permeability coefficient of human erythrocytes using 13C NMR.
- To validate NMR-based permeability measurements against non-NMR methods.
- To investigate the permeability of dimethyl methylphosphonate using 31P NMR and assess influencing factors.
Main Methods:
- Utilized two distinct 13C NMR procedures to determine the bicarbonate permeability coefficient (P).
- Employed a third procedure with 31P NMR to measure the permeability of dimethyl methylphosphonate.
- Investigated the impact of hematocrit and butanol concentrations on transmembrane exchange.
Main Results:
- The measured bicarbonate permeability coefficient (P) was approximately 3 x 10(-4) cm s-1.
- NMR-derived values were comparable to those obtained through conventional non-NMR methods.
- Effects of varying hematocrit and butanol on transmembrane exchange were documented.
Conclusions:
- 13C NMR spectroscopy provides a reliable method for quantifying human erythrocyte permeability.
- NMR techniques are suitable for studying transmembrane transport of both charged and non-electrolyte species in red blood cells.
- Further studies can leverage NMR to explore erythrocyte transport dynamics under various conditions.