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High sensitivity of embryonic stem cells to proteasome inhibitors correlates with low expression of heat shock

Jeong-A Park1, Young-Eun Kim, Yang-Hwa Ha

  • 1Department of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea.

BMB Reports
|May 24, 2012
PubMed

Insights

Mouse embryonic stem cells show higher sensitivity to proteotoxic stress due to reduced heat shock protein 70 (HSP70) expression and declining pluripotent cell markers, impacting their survival.

Area of Science:

  • Cellular biology
  • Molecular biology
  • Stem cell research

Background:

  • The ubiquitin-proteasome system is crucial for cellular protein degradation.
  • Proteasome dysfunction can lead to proteotoxic stress and cellular damage.

Purpose of the Study:

  • To investigate the response of mouse embryonic stem (ES) cells to proteotoxic stress.
  • To understand the differential sensitivity of ES cells compared to somatic cells.

Main Methods:

  • Treatment of mouse ES cells and somatic cells with proteasome inhibitors.
  • Measurement of heat shock protein 70 (HSP70) expression.
  • Assessment of pluripotent cell marker expression (Oct4, Nanog).
  • Quantification of apoptosis.

Main Results:

  • Proteasome inhibitors induced HSP70 expression and apoptosis in ES cells in a dose- and time-dependent manner.
  • ES cells exhibited higher levels of apoptosis compared to somatic cells.
  • Somatic cells showed a more significant increase in HSP70 expression than ES cells.
  • Pluripotent markers Oct4 and Nanog decreased in ES cells under stress.

Conclusions:

  • ES cells are more sensitive to proteotoxic stress than somatic cells.
  • This sensitivity is linked to a lower capacity for HSP70 induction and reduced expression of essential pluripotent markers.
  • These factors are critical for ES cell survival under proteotoxic conditions.

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