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Related Experiment Videos

Hydrostatic pressure influences histone mRNA.

A L Symington1, S Zimmerman, J Stein

  • 1Department of Zoology, University of Toronto, Canada.

Journal of Cell Science
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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High hydrostatic pressure significantly reduces histone mRNA levels in HeLa S3 cells by affecting both mRNA synthesis and stability. H1 histone mRNA suppression persists post-pressure, impacting cellular processes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Histone mRNA is crucial for DNA replication and cell division.
  • High hydrostatic pressure (HHP) is a physical stressor that can alter cellular functions.
  • Understanding the impact of HHP on gene expression is vital for cell biology.

Purpose of the Study:

  • To investigate the effects of HHP on core and H1 histone mRNA levels in HeLa S3 cells.
  • To determine the mechanisms underlying pressure-induced histone mRNA reduction, including synthesis and stability.
  • To assess the dose- and time-dependent effects of HHP on macromolecular synthesis.

Main Methods:

  • HeLa S3 cells were exposed to varying HHP levels (6.89 x 10^3 to 6.89 x 10^4 kPa).
  • Histone mRNA levels were quantified using hybridization to specific DNA probes.

Related Experiment Videos

  • Macromolecular synthesis was monitored using radioactive precursors; mRNA stability was assessed using Actinomycin D.

    • Main Results:

    • HHP significantly reduced core and H1 histone mRNA levels in a dose-dependent manner.
    • Core histone mRNA levels recovered post-decompression, while H1 histone mRNA remained suppressed.
    • Pressure-induced reduction in core histone mRNA involved both decreased transcription and reduced mRNA stability.

    Conclusions:

    • HHP affects histone mRNA regulation through both synthesis and stability pathways.
    • The instability of endogenous histone mRNA contributes to pressure-induced reductions.
    • HHP impacts cellular processes by altering the expression of key regulatory molecules like histone mRNA.