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Measuring Deformability and Red Cell Heterogeneity in Blood by Ektacytometry
Published on: January 12, 2018
Erythrocyte shape reversion from echinocytes to discocytes: kinetics via fast-measurement NMR diffusion-diffraction
Guilhem Pages1, Tsz W Yau, Philip W Kuchel
1School of Molecular Bioscience, The University of Sydney, New South Wales, Australia.
Magnetic Resonance in Medicine
|September 1, 2010
Summary
Pulsed field-gradient spin-echo NMR reveals how magnesium depletion alters red blood cell shapes. Reintroducing magnesium restores normal shapes, but changes in cell membrane structure persist, affecting cell alignment.
Area of Science:
- Biophysics
- Biochemistry
- Cell Biology
Background:
- Erythrocyte (red blood cell) shape is crucial for proper function.
- Alterations in erythrocyte shape can indicate disease states.
- Pulsed field-gradient spin-echo (PGSE) NMR spectroscopy is a powerful tool for characterizing cell morphology.
Purpose of the Study:
- To investigate erythrocyte shape reversion from echinocytic to discocytic forms.
- To understand the role of magnesium (Mg2+) in regulating erythrocyte shape.
- To explore the underlying biochemical and membrane changes during shape recovery.
Main Methods:
- PGSE NMR spectroscopy to analyze erythrocyte shapes via q-space plots.
- Light microscopy for corroborating shape estimates.
- (31)P NMR to probe biochemical pathways.
- (1)H spin-echo NMR to monitor phospholipid changes.
Main Results:
- PGSE NMR q-space plots showed disappearance and reappearance of diffusion-diffraction minima corresponding to Mg2+ depletion and recovery.
- Shape estimates from PGSE NMR and light microscopy showed good agreement.
- (31)P NMR indicated activation of the pentose phosphate pathway upon Mg2+ depletion/readdition.
- (1)H NMR revealed increased choline release, suggesting altered phospholipid asymmetry in recovered cells.
Conclusions:
- Mg2+ plays a critical role in maintaining erythrocyte shape.
- Shape recovery involves biochemical changes, including pentose phosphate pathway activation and altered phospholipid asymmetry.
- Changes in membrane asymmetry affect cell alignment in magnetic fields, influencing PGSE NMR q-space plots.
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