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Related Experiment Videos

Decrease of Ca(2+)-ATPase activity in human keratinocytes during calcium-induced differentiation

J K Cho1, D D Bikle

  • 1Department of Medicine, University of California, San Francisco, USA.

Journal of Cellular Physiology
|August 1, 1997
PubMed
Summary
This summary is machine-generated.

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Calcium (Ca2+) regulates keratinocyte differentiation. Loss of Ca2+-ATPase during differentiation increases intracellular Ca2+, promoting this process in human skin cells.

Area of Science:

  • Cell Biology
  • Dermatology
  • Biochemistry

Background:

  • Calcium ions (Ca2+) are critical regulators of cellular processes, including keratinocyte differentiation.
  • Understanding the role of specific calcium transporters, like Ca2+-ATPase, is essential for elucidating differentiation mechanisms.

Purpose of the Study:

  • To investigate the role and regulation of Ca2+-ATPase during calcium-induced differentiation of human keratinocytes.
  • To analyze Ca2+-ATPase mRNA, protein, and activity levels in relation to extracellular calcium concentrations and differentiation stage.

Main Methods:

  • Human keratinocytes were cultured in media with varying Ca2+ concentrations (0.03, 0.1, 1.2 mM).
  • Ca2+-ATPase mRNA, protein expression (using Western blot with anti-human erythrocyte Ca2+-ATPase antibody), and enzymatic activity were measured over 21 days.
Keywords:
Non-programmatic

Related Experiment Videos

  • Calcium influx and efflux were assessed in postconfluent cells.

    • Main Results:

    • Ca2+-ATPase mRNA levels showed a transient increase during early culture but decreased by day 21, independent of Ca2+ levels.
    • A 135-kDa Ca2+-ATPase protein was detected; its levels decreased with increasing Ca2+ and were lost during differentiation, correlating with reduced enzymatic activity.
    • Higher extracellular Ca2+ increased Ca2+ influx, while lower Ca2+ reduced Ca2+ efflux.

    Conclusions:

    • The decline of plasma membrane Ca2+-ATPase during keratinocyte culture and differentiation is a key event.
    • This loss contributes to elevated intracellular Ca2+ levels, thereby promoting keratinocyte differentiation.
    • Ca2+-ATPase activity is inversely related to the differentiation state of human keratinocytes.