The Actin Bundling Protein Fascin-1 as an ACE2-Accessory Protein

Area of Science:

• Biochemistry
• Molecular Biology
• Cardiovascular Research

Background:

• Angiotensin-converting enzyme 2 (ACE2) counterbalances harmful angiotensin type 1 receptor activation.
• ACE2 is internalized and degraded following chronic Angiotensin II (Ang-II) treatment.
• The molecular mechanisms driving ACE2 degradation remain largely unknown.

Purpose of the Study:

• To identify accessory proteins involved in ACE2 internalization and degradation.
• To elucidate the role of identified proteins in regulating ACE2 activity.

Main Methods:

• Proteomic analysis of ACE2-transfected HEK293T cells.
• Confocal microscopy and co-immunoprecipitation to confirm protein interactions.
• Assessment of ACE2 activity following fascin-1 manipulation (overexpression and downregulation).

Main Results:

• Fascin-1 was identified as a protein that differentially interacts with ACE2 after Ang-II treatment.
• Fascin-1 overexpression attenuated Ang-II effects on ACE2 activity.
• Fascin-1 downregulation significantly decreased ACE2 enzymatic activity.
• Reduced fascin-1 levels were observed in brain homogenates from hypertensive mice.

Conclusions:

• Fascin-1 is an ACE2-accessory protein that interacts with ACE2 in an Ang-II-dependent manner.
• Fascin-1 plays a crucial role in regulating ACE2 enzymatic activity.
• Altered fascin-1 levels may be relevant in the context of cardiovascular diseases.