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Cell membrane-dependent chromatin condensation

A E Vinogradov1

  • 1Institute of Cytology, Russian Academy of Sciences, St. Petersburg.

Cytometry
|February 1, 1995
PubMed
Summary

Mouse thymocyte chromatin rapidly decondenses after cell membrane damage. This chromatin decondensation is pH-dependent, offering insights into cell viability and nuclear structure dynamics.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Chromatin structure plays a crucial role in nuclear function and cellular processes.
  • Understanding rapid changes in chromatin organization following cellular damage is essential for cell viability studies.
  • Existing methods for assessing cell state and chromatin structure can be time-consuming or lack precision.

Purpose of the Study:

  • To investigate the rapid chromatin decondensation dynamics in mouse thymocytes after cell membrane damage.
  • To explore the influence of external factors, such as pH and ionic composition, on chromatin structure.
  • To develop a novel flow cytometry-based assay for monitoring chromatin condensation/decondensation and cell viability.

Main Methods:

  • Utilized flow cytometry to analyze chromatin changes in mouse thymocytes.
  • Induced cell membrane damage using a non-ionic detergent in physiologically relevant buffer solutions.
  • Assessed chromatin decondensation by measuring the binding of DNA-specific fluorochromes (olivomycin, propidium iodide) and DNAse I accessibility.
  • Investigated the effect of external pH and ionic composition on chromatin structure.
  • Employed formaldehyde fixation to preserve chromatin structure prior to detergent treatment.

Main Results:

  • Mouse thymocyte chromatin exhibited rapid decondensation within seconds of cell membrane damage.
  • Decondensation was evidenced by increased DNA-fluorochrome binding and enhanced DNAse I accessibility.
  • A similar chromatin decondensation pattern was observed in dead cells.
  • Lowering external pH to intracellular levels partially prevented chromatin decondensation.
  • The remaining decondensation was not attributed to divalent cations or small anion species.

Conclusions:

  • Cell membrane damage triggers rapid and significant chromatin decondensation in mouse thymocytes.
  • External pH is a key factor influencing the extent of chromatin decondensation.
  • A novel, formaldehyde-assisted flow cytometry assay can effectively monitor chromatin dynamics and determine cell viability.

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