Amiodarone induces cell wall channel formation in yeast Hansenula polymorpha

Area of Science:

• Microbiology
• Cell Biology
• Biochemistry

Background:

• Yeast cell walls undergo continuous remodeling for growth and division.
• Cellular stress responses often involve significant cellular modifications.

Purpose of the Study:

• To investigate the effects of amiodarone on the yeast cell wall.
• To characterize a novel cell wall modification induced by amiodarone in Hansenula polymorpha.

Main Methods:

• Light and electron microscopy to visualize cell wall changes.
• Fluorescent microscopy with DNA and mitochondrial stains (MitoTracker) to track material extrusion.
• Treatment of Hansenula polymorpha with amiodarone.

Main Results:

• Amiodarone rapidly induces the formation of 50-80 nm diameter channels in the yeast cell wall.
• Spherical, DNA-containing structures are observed on the cell surface and extruded through these channels.
• Extruded material includes mitochondria-derived components, as indicated by MitoTracker staining.

Conclusions:

• Amiodarone induces a novel form of cell wall channel formation in Hansenula polymorpha.
• These channels facilitate the extrusion of intracellular material, including mitochondrial components.
• This process may represent an adaptive stress response for yeast, enabling secretion of material to the extracellular environment.