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Updated: Feb 2, 2026

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Alarmin Detection in Senescent Cells.

Dong Eun Kim1, Albert R Davalos2

  • 1Buck Institute for Research on Aging, Novato, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|November 27, 2018
PubMed
Summary
This summary is machine-generated.

Senescent cells release damage-associated molecular pattern (DAMP) proteins, including High Mobility Group Box 1 (HMGB1). We used molecular techniques to show HMGB1 nuclear relocalization as a key senescence marker.

Keywords:
AlarminDamage-associated molecular pattern (DAMP)High Mobility Group Box 1 protein (HMGB1)ImmunofluorescenceImmunohistochemistryProtein precipitationWestern blot

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Area of Science:

  • Cellular senescence
  • Molecular biology
  • Immunology

Background:

  • Senescent cells undergo significant molecular changes.
  • These cells secrete various proteins, including damage-associated molecular patterns (DAMPs).
  • High Mobility Group Box 1 (HMGB1) is a critical DAMP protein involved in cellular stress responses.

Purpose of the Study:

  • To investigate the role of High Mobility Group Box 1 (HMGB1) protein relocalization during cellular senescence.
  • To establish HMGB1 nuclear export as a molecular signature of early senescence.
  • To validate molecular techniques for assessing HMGB1 relocalization.

Main Methods:

  • Immunofluorescence microscopy to visualize HMGB1 localization within cells.
  • Immunohistochemistry to detect HMGB1 in tissue contexts.
  • Western blot assays to quantify HMGB1 protein levels and changes in cellular compartments.

Main Results:

  • Demonstrated distinct HMGB1 relocalization from the nucleus to the extracellular space during initial senescence.
  • Confirmed the utility of immunofluorescence, immunohistochemistry, and Western blot assays for detecting this phenomenon.
  • Established HMGB1 nuclear export as a reliable indicator of early-stage senescence.

Conclusions:

  • HMGB1 nuclear relocalization serves as a sensitive molecular marker for early cellular senescence.
  • The employed molecular techniques are effective for studying senescence-associated secretory phenotypes.
  • Understanding HMGB1 dynamics in senescence is crucial for deciphering its role in aging and disease.