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CoCl2 induces apoptosis through the mitochondria- and death receptor-mediated pathway in the mouse embryonic stem

Jin-Ha Lee1, Seong-Ho Choi, Min-Woo Baek

  • 1Research Center for Biomineralization Disorder, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, South Korea.

Molecular and Cellular Biochemistry
|April 10, 2013
PubMed

Insights

Hypoxia induces apoptosis in mouse embryonic stem cells via mitochondrial and death receptor pathways. Cobalt chloride treatment reveals mechanisms involving reactive oxygen species and Bcl-2 family regulation.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Toxicology

Background:

  • Embryonic hypoxia/ischemia leads to poor fetal outcomes and lifelong disabilities.
  • Mechanisms of apoptosis in mouse embryonic stem (mES) cells under hypoxic conditions are not fully understood.

Purpose of the Study:

  • Investigate the biochemical and cellular mechanisms of apoptosis in mES cells induced by CoCl2-mediated hypoxia/ischemia.
  • Elucidate the roles of mitochondria- and death receptor-mediated pathways in this process.

Main Methods:

  • Induced hypoxia/ischemia in mES cells using Cobalt chloride (CoCl2).
  • Assessed cell viability, apoptosis markers (cell shrinkage, chromatin condensation, nuclear fragmentation), cell cycle progression (G2/M phase).
  • Measured reactive oxygen species (ROS) levels, mitochondrial potential (ΔΨm), cytochrome c release, and expression of apoptosis-related proteins (HIF-1α, caspases, p53, Bcl-2 family, Fas, Fas-ligand, Bid).

Main Results:

  • CoCl2 exposure increased HIF-1α expression and ROS accumulation in mES cells.
  • Decreased cell viability, induced apoptosis, and cell cycle arrest at G2/M phase were observed.
  • Mitochondrial dysfunction (cytochrome c release, loss of ΔΨm) and activation of caspases (-3, -8, -9) were evident.
  • Upregulation of p53 and death receptor pathway components (Fas, Fas-ligand, cleaved Bid) occurred, alongside downregulation of anti-apoptotic proteins (Bcl-2, Bcl-xL).

Conclusions:

  • CoCl2 induces apoptosis in mES cells through both intrinsic (mitochondrial) and extrinsic (death receptor) pathways.
  • The Bcl-2 family of proteins plays a crucial regulatory role in CoCl2-induced apoptosis.
  • Findings provide insights into the cellular response to embryonic hypoxia/ischemia.

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