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Related Experiment Video

Updated: Jul 4, 2026

Examining BCL-2 Family Function with Large Unilamellar Vesicles

Examining BCL-2 Family Function with Large Unilamellar Vesicles

Published on: October 5, 2012

Cholesterol effects on BAX pore activation.

Eric Christenson¹, Sean Merlin, Mitsu Saito

¹Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110, USA.

Journal of Molecular Biology

|July 2, 2008

Summary

Cholesterol inhibits BAX-mediated apoptosis by preventing the BAX protein from integrating into cell membranes. This disruption of BAX integration blocks pore formation and halts the cell death pathway.

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Last Updated: Jul 4, 2026

Examining BCL-2 Family Function with Large Unilamellar Vesicles

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Published on: October 5, 2012

Cholesterol Efflux Assay

Cholesterol Efflux Assay

Published on: March 6, 2012

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

Published on: March 25, 2020

Area of Science:

Biochemistry
Cell Biology
Molecular Biology

Background:

The BCL-2 protein family regulates apoptosis (programmed cell death).
BAX, a key BCL-2 family member, exists in soluble, membrane-bound, and membrane-integrated forms crucial for apoptosis.
Understanding BAX's conformational changes and membrane interactions is vital for controlling cell death.

Purpose of the Study:

To characterize the transition of BAX from a soluble to a membrane-integrated state.
To investigate the role of cholesterol in regulating BAX membrane integration and pore formation.
To elucidate the mechanism by which BAX initiates apoptosis.

Main Methods:

Utilized purified monomeric human BAX, liposomes, and isolated human mitochondria.
Analyzed the soluble-to-membrane transition, binding, integration, oligomerization, and pore formation.
Investigated the effect of cholesterol on BAX-membrane interactions in vitro and in isolated mitochondria.

Main Results:

BAX activation, not oligomerization, is necessary for initial membrane binding.
Membrane integration is a distinct step following reversible membrane binding.
Cholesterol significantly reduces BAX integration into liposomes and mitochondrial membranes, inhibiting pore formation.
BAX targets intracellular membranes but not the plasma membrane during apoptosis initiation.

Conclusions:

Cholesterol inhibits BAX-mediated pore formation by impeding its transition to a membrane-integral state.
This cholesterol-induced inhibition of BAX integration affects apoptosis regulation at intracellular membranes.
The findings provide insights into the molecular mechanisms controlling BAX activity and cell death.