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Stemming danger with Golgified BAX.

Loren D Walensky¹

¹Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA. loren_walensky@dfci.harvard.edu

|June 12, 2012

Summary

Human embryonic stem (hES) cells send activated BAX proteins to the trans Golgi network. This unexpected pathway initiates mitochondrial damage after DNA injury.

Area of Science:

Cell biology
Molecular biology
Biochemistry

Background:

The proapoptotic protein BAX plays a critical role in programmed cell death.
Understanding the precise localization and activation of BAX is crucial for controlling apoptosis.

Discussion:

Dumitru et al. reveal that activated BAX accumulates at the trans Golgi network in human embryonic stem (hES) cells.
This localization serves as a novel signaling hub for initiating apoptosis.
The trans Golgi network acts as a previously unrecognized platform for mitochondrial outer membrane permeabilization.

Key Insights:

Conformationally activated BAX is targeted to the trans Golgi network in response to DNA damage.
This finding challenges the traditional view of BAX activation and mitochondrial targeting.

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The trans Golgi network is implicated as a key initiator of the apoptotic cascade.

Outlook:

Further research can explore therapeutic strategies targeting this pathway to modulate cell death.
Investigating the precise molecular mechanisms of BAX transport to the trans Golgi network is warranted.
This discovery opens new avenues for understanding cell fate decisions in stem cells and cancer.