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Measurements of Physiological Stress Responses in C. Elegans
Published on: May 21, 2020
Dynamic ABCG2 expression in human embryonic stem cells provides the basis for stress response
Zsuzsa Erdei1, Balázs Sarkadi, Anna Brózik
1Membrane Research Group of the Hungarian Academy of Sciences, Semmelweis, University and National Blood Center, Diószegi u. 64., 1113, Budapest, Hungary.
European Biophysics Journal : EBJ
|August 2, 2012
Summary
The ATP-binding cassette sub-family G member 2 (ABCG2) transporter enhances human embryonic stem cell (hESC) survival under stress. Its dynamic expression allows stem cells to adapt to environmental changes, potentially offering an evolutionary advantage.
Area of Science:
- Cell Biology
- Stem Cell Biology
- Molecular Biology
Background:
- ATP-binding cassette sub-family G member 2 (ABCG2) is a plasma membrane transporter linked to cancer drug resistance.
- ABCG2 is expressed in various stem cell types, including human embryonic stem cells (hESCs).
- Previous work indicated heterogeneous ABCG2 expression in hESC lines.
Purpose of the Study:
- To investigate the heterogeneity of ABCG2 expression in hESCs.
- To determine if ABCG2 expression is related to stress responses in hESCs.
- To explore the functional implications of ABCG2 heterogeneity in hESCs.
Main Methods:
- Analysis of pluripotency markers in ABCG2-positive and negative hESCs.
- Assessment of hESC growth rates after cell separation.
- Evaluation of hESC tolerance to various stress conditions (physical, chemical, UV, oxidative).
- Monitoring ABCG2 localization under different stress conditions.
Main Results:
- No difference in pluripotency marker expression between ABCG2-positive and negative hESCs.
- ABCG2-expressing hESCs exhibited a higher growth rate post-separation.
- ABCG2-positive hESCs showed enhanced tolerance to physical stress, drugs, and UV radiation.
- Mild oxidative stress induced rapid internalization of ABCG2 in hESCs.
- ABCG2's transporter function likely protects cells by eliminating toxic metabolites.
Conclusions:
- Dynamic ABCG2 expression heterogeneity in hESCs facilitates adaptation to environmental changes.
- This actively maintained heterogeneity may confer an evolutionary advantage for protecting stem cells.
- ABCG2's role extends beyond drug resistance to stem cell survival and environmental responsiveness.
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