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Endogenous beta-galactosidase activity in continuously nonproliferating cells

Y E Yegorov1, S S Akimov, R Hass

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilov Street, Moscow, 117984, Russia. yegorov@genome.eimb.rssi.ru

Experimental Cell Research
|August 26, 1998
PubMed
Summary

Endogenous beta-galactosidase activity at pH 6.0 is detected in nonproliferating cells, including senescent cells, and during macrophage differentiation. This suggests it is not an exclusive marker for cellular senescence.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Gerontology

Background:

  • Cellular senescence is a state of irreversible growth arrest.
  • Beta-galactosidase activity is often used as a biomarker for senescence.
  • The specific conditions and cell types expressing beta-galactosidase require further investigation.

Purpose of the Study:

  • To investigate the expression of endogenous beta-galactosidase activity at pH 6.0 in various cellular contexts.
  • To determine if beta-galactosidase activity at pH 6.0 is exclusively indicative of cellular senescence.

Main Methods:

  • Cytochemical detection of beta-galactosidase activity.
  • Cell culture of Swiss 3T3, U937, and HL60 cell lines.
  • Induction of differentiation using TPA (12-O-tetradecanoylphorbol-13-acetate).

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  • Manipulation of cell culture conditions (low serum, heparin).

    • Main Results:

    • Beta-galactosidase activity at pH 6.0 was observed in Swiss 3T3 cells under conditions of low serum or heparin-induced growth inhibition.
    • A high proportion of beta-galactosidase-positive cells were found in U937 and HL60 cells undergoing TPA-induced macrophage-like differentiation.
    • A small population of beta-galactosidase-positive cells with senescent morphology was also detected in growing Swiss 3T3 cultures.

    Conclusions:

    • Endogenous beta-galactosidase activity at pH 6.0 is present in various nonproliferating cell types, not solely senescent cells.
    • This enzyme activity is observed during macrophage differentiation and under specific growth-inhibitory conditions.
    • Beta-galactosidase activity at pH 6.0 is not a definitive or exclusive marker for cellular senescence.