Rapid zero-trans kinetics of Cs + exchange in human erythrocytes quantified by dissolution hyperpolarized 133 Cs + NMR spectroscopy

Transmembrane flux of Cs (a K congener) was measured in human red blood cells (RBCs; erythrocytes) on the 10-s time scale. This is the first report on dissolution dynamic nuclear polarization (dDNP) nuclear magnetic resonance (NMR) spectroscopy with this nuclide in mammalian cells. Four technical de...

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Bibliographic Details
Published in:Scientific reports 2019-12, Vol.9 (1), p.19726
Main Authors: Kuchel, Philip W, Karlsson, Magnus, Lerche, Mathilde Hauge, Shishmarev, Dmitry, Ardenkjaer-Larsen, Jan Henrik
Format: Article
Language:English
Subjects:
Biological Transport
Cesium - metabolism
Computer Simulation
Erythrocytes - metabolism
Humans
Kinetics
Magnetic Resonance Spectroscopy
Membrane Potentials
Permeability
Reproducibility of Results
Time Factors
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Summary:Transmembrane flux of Cs (a K congener) was measured in human red blood cells (RBCs; erythrocytes) on the 10-s time scale. This is the first report on dissolution dynamic nuclear polarization (dDNP) nuclear magnetic resonance (NMR) spectroscopy with this nuclide in mammalian cells. Four technical developments regularized sample delivery and led to high quality NMR spectra. Cation-free media with the Piezo1 (mechanosensitive cation channel) activator yoda1 maximized the extent of membrane transport. First-order rate constants describing the fluxes were estimated using a combination of statistical methods in Mathematica, including the Markov chain Monte Carlo (MCMC) algorithm. Fluxes were in the range 4-70 μmol Cs (L RBC)  s ; these are smaller than for urea, but comparable to glucose. Methodology and analytical procedures developed will be applicable to transmembrane cation transport studies in the presence of additional Piezo1 effectors, to other cellular systems, and potentially in vivo.
ISSN:2045-2322