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Chloride transport in human red cells.

M Dalmark

    The Journal of Physiology
    |August 1, 1975
    PubMed
    Summary

    This study quantifies human red cell chloride equilibrium flux, revealing saturation kinetics and a pH-dependent transport model. Findings elucidate chloride self-exchange mechanisms and carrier properties.

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    Area of Science:

    • Biophysics
    • Cellular Physiology

    Background:

    • Chloride transport across cell membranes is crucial for cellular function.
    • Understanding the kinetics and regulation of chloride flux is essential for physiological studies.

    Purpose of the Study:

    • To determine the chloride equilibrium flux (self-exchange) in human red blood cells.
    • To investigate the effects of chloride concentration, pH, and temperature on chloride transport kinetics.
    • To develop a transport model describing the observed chloride flux behavior.

    Main Methods:

    • Measuring 36Cl efflux from radioactively labeled human red cells.
    • Utilizing the nystatin technique to vary intracellular chloride concentrations.
    • Analyzing chloride transport kinetics using Michaelis-Menten and other models across different pH and temperature conditions.

    Main Results:

    • Chloride equilibrium flux exhibited saturation kinetics, decreasing at very high chloride concentrations.
    • The apparent half-saturation constant (K1/2) was pH-dependent, with distinct behaviors observed at different pH ranges.
    • A transport model involving a positively charged, chloride-binding carrier accurately described the flux as a function of chloride concentration, pH, and temperature.

    Conclusions:

    • The chloride self-exchange mechanism in human red cells is characterized by saturation kinetics and significant pH dependence.
    • A mobile, positively charged carrier model with specific kinetic parameters explains the observed chloride transport.
    • The findings provide insights into the regulation of anion transport in red blood cells.

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