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Membrane transport during erythroid differentiation.

P B Gordon, M S Rubin

The Journal of Membrane Biology

|January 1, 1982

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Cellular nutrient transport changes during red blood cell development. Specific amino acid and sugar transport increased, while nucleoside transport decreased, suggesting preferential maintenance of energy production pathways.

Area of Science:

Cell Biology
Biochemistry
Hematology

Background:

Cellular differentiation involves significant metabolic and transport changes.
Erythroid maturation presents a unique model for studying developmental alterations in cell function.
Understanding nutrient transport is crucial for comprehending cellular energy demands during development.

Purpose of the Study:

To compare the transport of monosaccharides, nucleosides, and amino acids across cell membranes at different stages of erythroid development.
To investigate alterations in specific nutrient transporter activity during the differentiation of Friend erythroleukemia cells and normal mouse erythrocytes.
To elucidate the relationship between cell size, surface area, and nutrient flux during erythroid maturation.

Main Methods:

Related Experiment Videos

Utilized unidirectional flux assays to quantify the transport rates of 3-O-methylglucose (monosaccharide), uridine (nucleoside), and amino acids (3-O-methylglucose, aminoisobutyrate, leucine, lysine).
Compared transport kinetics in undifferentiated Friend erythroleukemia cells, differentiated Friend erythroleukemia cells, and normal anucleate mouse erythrocytes.
Measured median cell volume to assess changes in surface area relative to transport rates.

Main Results:

Transport of 3-O-methylglucose increased progressively with erythroid developmental stage.
Aminoisobutyrate transport remained stable during Friend cell differentiation but decreased slightly in erythrocytes.
Leucine and lysine transport decreased following dimethyl sulfoxide (DMSO) induction and further diminished in mature erythrocytes, while uridine transport paralleled the decrease in surface area.

Conclusions:

Specific nutrient transporters exhibit distinct alterations during erythroid maturation.
Increased monosaccharide and amino acid flux, despite reduced surface area, suggests enhanced transport efficiency for energy production.
Preferential maintenance of transport sites for energy-requiring nutrients may be a key feature of erythroid development.