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Related Experiment Videos

Decrease in protein content and cell volume of cultured dog kidney epithelial cells during growth

S U Erlinger, M H Saier

    In Vitro
    |March 1, 1982
    PubMed
    Summary

    Cellular protein and volume in MDCK cells decrease with growth. This change impacts transport measurements, requiring adjustments for accurate interpretation of experimental results.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Physiology

    Background:

    • MDCK cells and their tumorigenic transformants (T1k) are widely used models for epithelial transport studies.
    • Cellular characteristics like protein content and volume can fluctuate during cell culture.
    • Accurate interpretation of transport data relies on consistent normalization methods.

    Purpose of the Study:

    • To investigate the relationship between cell density, protein content, and cell volume in MDCK cells.
    • To determine how these cellular variations affect the interpretation of solute transport measurements.
    • To compare these effects in both serum-containing and serum-free media.

    Main Methods:

    • Quantification of protein content per cell in MDCK and T1k cells.

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  • Measurement of cell volume using 3-O-methyl-D-glucose uptake.
  • Analysis of 22Na+ uptake under varying cell densities and media conditions.
  • Correlation analysis between cell number, protein content, and cell volume.

    • Main Results:

    • Both protein content per cell and cell volume decreased significantly as cell density increased.
    • Inverse linear correlations were established between protein content/cell volume and the logarithm of cell number.
    • No significant differences were observed between cells cultured in serum-containing versus serum-free media.
    • Expression of 22Na+ uptake data varied depending on whether it was normalized to cell number, protein content, or cell volume.

    Conclusions:

    • Cellular protein content and volume in MDCK cells are inversely correlated with cell number during growth.
    • These dynamic cellular changes necessitate careful consideration when interpreting solute transport data.
    • Normalization of transport measurements to protein content or cell volume provides more consistent results than normalization to cell number.